Bumping version

Remove old JSON warning
Bump github.com/pelletier/go-toml/v2 from 2.1.1 to 2.2.0 (#1986 )
2026-08-24 16:39:58 +08:00 · 2024-03-24 10:54:14 +11:00 · 2024-03-23 17:17:23 +11:00 · 2024-03-23 17:15:56 +11:00 · 2024-03-23 17:15:45 +11:00 · 2024-03-22 20:44:49 +11:00
409 changed files with 28806 additions and 5315 deletions
@@ -26,7 +26,7 @@ country: Australia
 And we run a command:

 ```bash
-yq eval 'predictWeatherOf(.country)'
+yq 'predictWeatherOf(.country)'
 ```

 it could output
@@ -0,0 +1,70 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '24 3 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v3
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
@@ -0,0 +1,82 @@
+name: Release Docker
+
+on:
+  release:
+    types: [released]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  publishDocker:
+    environment: dockerhub
+    env:
+      IMAGE_NAME: mikefarah/yq
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          version: latest
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
+
+      - name: Build and push image
+        run: |
+          echo "GithubRef: ${GITHUB_REF}"
+          VERSION=${GITHUB_REF##*/}
+          echo "VERSION: ${VERSION}"
+          IMAGE_VERSION=${VERSION:1}
+          echo "IMAGE_VERSION: ${IMAGE_VERSION}"
+
+          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
+
+          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
+          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line data file processor" \
+            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
+            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
+            --label "org.opencontainers.image.title=yq" \
+            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
+            --platform "${PLATFORMS}" \
+            --pull \
+            --push \
+            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
+            -t "${IMAGE_NAME}:4" \
+            -t "${IMAGE_NAME}:latest" \
+            .
+          
+          cd github-action
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line data file processor" \
+            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
+            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
+            --label "org.opencontainers.image.title=yq" \
+            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
+            --platform "${PLATFORMS}" \
+            --pull \
+            --push \
+            -t "${IMAGE_NAME}:${IMAGE_VERSION}-githubaction" \
+            -t "${IMAGE_NAME}:4-githubaction" \
+            -t "${IMAGE_NAME}:latest-githubaction" \
+            .
@@ -1,5 +1,8 @@
 name: Build
 on: [push, pull_request]
+permissions:
+  contents: read
+
 jobs:

  build:
@@ -7,14 +10,14 @@ jobs:
    runs-on: ubuntu-latest
    steps:

-    - name: Set up Go 1.17
-      uses: actions/setup-go@v2
+    - name: Set up Go
+      uses: actions/setup-go@v5
      with:
-        go-version: 1.17
+        go-version: '^1.20'
      id: go

    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4

    - name: Get dependencies
      run: |
@@ -25,6 +28,7 @@ jobs:
        fi

    - name: Check the build
+      shell: bash -l {0}
      run: |
        export PATH=${PATH}:`go env GOPATH`/bin
        scripts/devtools.sh
@@ -2,25 +2,26 @@ name: Release YQ
 on:
  push:
    tags:
-      - 'v*'
+      - 'v4.*'
+      - 'draft-*'

 jobs:
  publishGitRelease:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
        with:
-          go-version: '^1.17.5'
+          go-version: '^1.20'
+          check-latest: true
      - name: Compile man page markup
        id: gen-man-page-md
        run: |
          ./scripts/generate-man-page-md.sh
-          echo "::set-output name=man-page-md::man.md"

      - name: Get the version
        id: get_version
-        run: echo ::set-output name=VERSION::${GITHUB_REF##*/}
+        run: echo "VERSION=${GITHUB_REF##*/}" >> "${GITHUB_OUTPUT}"

      - name: Generate man page
        uses: docker://pandoc/core:2.14.2
@@ -34,77 +35,19 @@ jobs:
            --variable=header:"yq (https://github.com/mikefarah/yq/) version ${{ steps.get_version.outputs.VERSION }}"
            --variable=author:"Mike Farah"
            --output=yq.1
-            ${{ steps.gen-man-page-md.outputs.man-page-md }}
+            man.md

      - name: Cross compile
        run: |
          sudo apt-get install rhash -y
-          go get github.com/mitchellh/gox
+          go install github.com/mitchellh/gox@v1.0.1
          mkdir -p build
          cp yq.1 build/yq.1
          ./scripts/xcompile.sh

-      - name: Create Release
-        id: create_release
-        uses: actions/create-release@v1.1.4
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Release
+        uses: softprops/action-gh-release@v1
        with:
-          tag_name: ${{ github.ref }}
-          release_name: ${{ github.ref }}
+          files: build/*
          draft: true
-          prerelease: false
-
-      - uses: shogo82148/actions-upload-release-asset@v1
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: build/*
-
-  publishDocker:
-    environment: dockerhub
-    env:
-      IMAGE_NAME: mikefarah/yq
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-        with:
-          platforms: all
-
-      - name: Set up Docker Buildx
-        id: buildx
-        uses: docker/setup-buildx-action@v1
-        with:
-          version: latest
-
-      - name: Available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
-
-      - name: Build and push image
-        run: |
-          IMAGE_V_VERSION="$(git describe --tags --abbrev=0)"
-          IMAGE_VERSION=${IMAGE_V_VERSION:1}
-          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
-
-          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
-          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
-          docker buildx build \
-            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
-            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
-            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
-            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.licenses=MIT" \
-            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
-            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
-            --label "org.opencontainers.image.title=yq" \
-            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
-            --platform "${PLATFORMS}" \
-            --pull \
-            --push \
-            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
-            -t "${IMAGE_NAME}:4" \
-            -t "${IMAGE_NAME}:latest" \
-            .
+          fail_on_unmatched_files: true
@@ -0,0 +1,23 @@
+name: Release Snap
+
+on:
+  release:
+    types: [released]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+    buildSnap:
+      environment: snap
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - uses: snapcore/action-build@v1
+          id: build
+        - uses: snapcore/action-publish@v1
+          env:
+            SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.STORE_LOGIN }}
+          with:
+            snap: ${{ steps.build.outputs.snap }}
+            release: stable
@@ -1,5 +1,11 @@
 name: Test Yq Action
-on: [push]
+on: 
+  push:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
 jobs:

  build:
@@ -7,13 +13,16 @@ jobs:
    runs-on: ubuntu-latest

    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
      - name: Get test
+        id: get_value
        uses: mikefarah/yq@master
        with:
-          cmd: yq eval '.a' examples/sample.yaml
+          cmd: yq '.test' examples/multiline-text.yaml
+      - name: Multiline test
+        run: echo "### It was [${{ steps.get_value.outputs.result }}]" >> $GITHUB_STEP_SUMMARY
      - name: Write inplace test
        id: lookupSdkVersion
        uses: mikefarah/yq@master
        with:
-          cmd: yq eval -i '.b.c = 5' examples/sample.yaml
+          cmd: yq -i '.b.c = 5' examples/sample.yaml
@@ -41,6 +41,9 @@ yq*.snap

 test.yml
 test*.yml
+test*.xml
+test*.toml
+test*.yaml
 0.yml
 1.yml
 2.yml
@@ -53,3 +56,11 @@ yq.1
 # debian pkg
 _build
 debian/files
+
+# intellij
+/.idea
+
+# vscode
+.vscode
+
+yq3
@@ -18,6 +18,17 @@ linters:
    - revive
    - unconvert
    - unparam
+linters-settings:
+  depguard:
+    rules:
+      prevent_unmaintained_packages:
+        list-mode: lax
+        files:
+          - $all
+          - "!$test"
+        deny:
+          - pkg: io/ioutil
+            desc: "replaced by io and os packages since Go 1.16: https://tip.golang.org/doc/go1.16#ioutil"
 issues:
  exclude-rules:
  - linters:
@@ -1,4 +1,6 @@
-1. Install (golang)[https://golang.org/]
+# Development
+
+1. Install (Golang)[https://golang.org/]
 1. Run  `scripts/devtools.sh` to install the required devtools
 2. Run `make [local] vendor` to install the vendor dependencies
 2. Run `make [local] test` to ensure you can run the existing tests
@@ -6,3 +8,33 @@
 4. Make the code changes.
 5. `make [local] test` to lint code and run tests
 6. Profit! ok no profit, but raise a PR and get kudos :)
+
+
+# Documentation
+
+The documentation is a bit of a mixed bag (sorry in advance, I do plan on simplifying it...) - with some parts automatically generated and stiched together and some statically defined.
+
+Documentation is written in markdown, and is published in the 'gitbook' branch.
+
+The various operator documentation (e.g. 'strings') are generated from the 'master' branch, and have a statically defined header (e.g. `pkg/yqlib/doc/operators/headers/add.md`) and the bulk of the docs are generated from the unit tests e.g. `pkg/yqlib/operator_add_test.go`.
+
+The pipeline will run the tests and automatically concatenate the files together, and put them under 
+`pkg/qylib/doc/add.md`. These files are checked in the master branch (and are copied to the gitbook branch as part of the release process).
+
+## How to contribute
+
+The first step is to find if what you want is automatically generated or not - start by looking in the master branch. 
+
+### Updating dynamic documentation from master
+- Search for the documentation you want to update. If you find matches in a `*_test.go` file - update that, as that will automatically update the matching `*.md` file 
+- Assuming you are updating a `*_test.go` file, once updated, run the test to regenerated the docs. E.g. for the 'Add' test generated docs, from the pkg/yqlib folder run:
+`go test -run TestAddOperatorScenarios` which will run that test defined in the `operator_add_test.go` file.
+- Ensure the tests still pass, and check the generated documentation have your update.
+- Note: If the documentation is only in a `headers/*.md` file, then just update that directly
+- Raise a PR to merge the changes into master!
+
+### Updating static documentation from the gitbook branch
+If you haven't found what you want to update in the master branch, then check the gitbook branch directly as there are a few pages in there that are not in master.
+
+- Update the `*.md` files
+- Raise a PR to merge the changes into gitbook.
@@ -1,10 +1,10 @@
-FROM golang:1.17 as builder
+FROM golang:1.22.1 as builder

 WORKDIR /go/src/mikefarah/yq

 COPY . .

-RUN CGO_ENABLED=0 go build .
+RUN CGO_ENABLED=0 go build -ldflags "-s -w" .
 # RUN ./scripts/test.sh -- this too often times out in the github pipeline.
 RUN ./scripts/acceptance.sh

@@ -1,4 +1,4 @@
-FROM golang:1.17
+FROM golang:1.22.1

 COPY scripts/devtools.sh /opt/devtools.sh

@@ -6,5 +6,7 @@ RUN set -e -x \
    && /opt/devtools.sh
 ENV PATH=/go/bin:$PATH

+RUN apt-get update && apt-get install -y npm && npm install -g npx cspell@latest
+
 ENV CGO_ENABLED 0
 ENV GOPATH /go:/yq
@@ -84,8 +84,12 @@ format: vendor
 	${ENGINERUN} bash ./scripts/format.sh


+.PHONY: spelling
+spelling: format
+	${ENGINERUN} bash ./scripts/spelling.sh
+
 .PHONY: secure
-secure: format
+secure: spelling
 	${ENGINERUN} bash ./scripts/secure.sh

 .PHONY: check
@@ -7,6 +7,7 @@ export GIT_DESCRIBE = $(shell git describe --tags --always)
 LDFLAGS :=
 LDFLAGS += -X main.GitCommit=${GIT_COMMIT}${GIT_DIRTY}
 LDFLAGS += -X main.GitDescribe=${GIT_DESCRIBE}
+LDFLAGS += -w -s

 GITHUB_TOKEN ?=

@@ -1,9 +1,9 @@
 # yq

-![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq)
+![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq) ![CodeQL](https://github.com/mikefarah/yq/workflows/CodeQL/badge.svg)


-a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
+a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json, xml, properties, csv and tsv. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.

 yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker and Podman, all listed below.

@@ -11,46 +11,67 @@ yq is written in go - so you can download a dependency free binary for your plat

 Read a value:
 ```bash
-yq e '.a.b[0].c' file.yaml
+yq '.a.b[0].c' file.yaml
 ```

 Pipe from STDIN:
 ```bash
-cat file.yaml | yq e '.a.b[0].c' -
+yq '.a.b[0].c' < file.yaml
 ```

-Update a yaml file, inplace
+Update a yaml file, in place
 ```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
+yq -i '.a.b[0].c = "cool"' file.yaml
 ```

 Update using environment variables
 ```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
 ```

 Merge multiple files
-```
+```bash
+# merge two files
+yq -n 'load("file1.yaml") * load("file2.yaml")'
+
+# merge using globs:
+# note the use of `ea` to evaluate all the files at once
+# instead of in sequence
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```

 Multiple updates to a yaml file
 ```bash
-yq e -i '
+yq -i '
  .a.b[0].c = "cool" |
  .x.y.z = "foobar" |
  .person.name = strenv(NAME)
 ' file.yaml
 ```

-See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+Find and update an item in an array:
+```bash
+yq '(.[] | select(.name == "foo") | .address) = "12 cat st"'
+```
+
+Convert JSON to YAML
+```bash
+yq -Poy sample.json
+```
+
+See [recipes](https://mikefarah.gitbook.io/yq/recipes) for more examples and the [documentation](https://mikefarah.gitbook.io/yq/) for more information.
+
+Take a look at the discussions for [common questions](https://github.com/mikefarah/yq/discussions/categories/q-a), and [cool ideas](https://github.com/mikefarah/yq/discussions/categories/show-and-tell)

 ## Install

 ### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)

 ### wget
-Use wget to download the pre-compiled binaries:
+Use wget to download, gzipped pre-compiled binaries:
+
+
+For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64

 #### Compressed via tar.gz
 ```bash
@@ -65,7 +86,12 @@ wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /
    chmod +x /usr/bin/yq
 ```

-For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
+#### Latest version
+
+```bash
+wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq &&\
+    chmod +x /usr/bin/yq
+```

 ### MacOS / Linux via Homebrew:
 Using [Homebrew](https://brew.sh/)
@@ -82,30 +108,32 @@ snap install yq
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:

 ```
-sudo cat /etc/myfile | yq e '.a.path' - 
+sudo cat /etc/myfile | yq '.a.path'
 ```

 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```

 ### Run with Docker or Podman
-
 #### Oneshot use:

 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```

+Note that you can run `yq` in docker without network access and other privileges if you desire,
+namely `--security-opt=no-new-privileges --cap-drop all --network none`.
+
 ```bash
-podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```

 #### Pipe in via STDIN:
@@ -113,11 +141,11 @@ podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression
 You'll need to pass the `-i\--interactive` flag to docker:

 ```bash
-cat myfile.yml | docker run -i --rm mikefarah/yq e . -
+docker run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```

 ```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq e . -
+podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```

 #### Run commands interactively:
@@ -143,8 +171,6 @@ yq() {
  podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```
-
-
 #### Running as root:

 `yq`'s container image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the container image, or you're having permissions issues when attempting to read/write files you'll need to either:
@@ -164,29 +190,67 @@ Or, in your Dockerfile:
 FROM mikefarah/yq

 USER root
-RUN apk add bash
+RUN apk add --no-cache bash
 USER yq
 ```

+#### Missing timezone data
+By default, the alpine image yq uses does not include timezone data. If you'd like to use the `tz` operator, you'll need to include this data:
+
+```
+FROM mikefarah/yq
+
+USER root
+RUN apk add --no-cache tzdata
+USER yq
+```
+
+#### Podman with SELinux
+
+If you are using podman with SELinux, you will need to set the shared volume flag `:z` on the volume mount:
+
+```
+-v "${PWD}":/workdir:z
+```
+
 ### GitHub Action
 ```
  - name: Set foobar to cool
    uses: mikefarah/yq@master
    with:
-      cmd: yq eval -i '.foo.bar = "cool"' 'config.yml'
+      cmd: yq -i '.foo.bar = "cool"' 'config.yml'
+  - name: Get an entry with a variable that might contain dots or spaces
+    id: get_username
+    uses: mikefarah/yq@master
+    with:
+      cmd: yq '.all.children.["${{ matrix.ip_address }}"].username' ops/inventories/production.yml
+  - name: Reuse a variable obtained in another step
+    run: echo ${{ steps.get_username.outputs.result }}
 ```

 See https://mikefarah.gitbook.io/yq/usage/github-action for more.

-### Go Get:
+### Go Install:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v4
+go install github.com/mikefarah/yq/v4@latest
 ```

 ## Community Supported Installation methods
 As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.

-# Webi
+_Please note that the Debian package (previously supported by @rmescandon) is no longer maintained. Please use an alternative installation method._
+
+
+### Nix
+
+```
+nix profile install nixpkgs#yq-go
+```
+
+See [here](https://search.nixos.org/packages?channel=unstable&show=yq-go&from=0&size=50&sort=relevance&type=packages&query=yq-go)
+
+
+### Webi

 ```
 webi yq
@@ -202,6 +266,9 @@ pacman -S go-yq
 ```

 ### Windows:
+
+Using [Chocolatey](https://chocolatey.org)
+
 [![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
 [![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
 ```
@@ -209,6 +276,16 @@ choco install yq
 ```
 Supported by @chillum (https://chocolatey.org/packages/yq)

+Using [scoop](https://scoop.sh/)
+```
+scoop install main/yq
+```
+
+Using [winget](https://learn.microsoft.com/en-us/windows/package-manager/)
+```
+winget install --id MikeFarah.yq
+```
+
 ### Mac:
 Using [MacPorts](https://www.macports.org/)
 ```
@@ -226,32 +303,26 @@ Supported by Tuan Hoang
 https://pkgs.alpinelinux.org/package/edge/community/x86/yq


-### On Ubuntu 16.04 or higher from Debian package:
-```sh
-sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
-sudo add-apt-repository ppa:rmescandon/yq
-sudo apt update
-sudo apt install yq -y
-```
-Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
-
 ## Features
 - [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
- Uses similar syntax as `jq` but works with YAML and JSON files
+- Uses similar syntax as `jq` but works with YAML, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
 - Fully supports multi document yaml files
 - Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
 - Colorized yaml output
- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
+- [Date/Time manipulation and formatting with TZ](https://mikefarah.gitbook.io/yq/operators/datetime)
+- [Deeply data structures](https://mikefarah.gitbook.io/yq/operators/traverse-read)
+- [Sort keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
 - Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update in place](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
 - [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
+- [Decode/Encode base64 data](https://mikefarah.gitbook.io/yq/operators/encode-decode)
 - [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
- [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
- [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
+- [Convert to/from json/ndjson](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
+- [Convert to/from properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
+- [Convert to/from csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
 - [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
 - [Github Action](https://mikefarah.gitbook.io/yq/usage/github-action) to use in your automated pipeline (thanks @devorbitus)
@@ -265,33 +336,47 @@ Usage:
  yq [flags]
  yq [command]

+Examples:
+
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+yq '.stuff' < myfile.yml # outputs the data at the "stuff" node from "myfile.yml"
+
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml in place
+
+
 Available Commands:
-  eval             Apply the expression to each document in each yaml file in sequence
+  completion       Generate the autocompletion script for the specified shell
+  eval             (default) Apply the expression to each document in each yaml file in sequence
  eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
  help             Help about any command
  shell-completion Generate completion script

 Flags:
-  -C, --colors                force print with colors
-  -e, --exit-status           set exit status if there are no matches or null or false is returned
-  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
-      --header-preprocess     Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
-  -h, --help                  help for yq
-  -I, --indent int            sets indent level for output (default 2)
-  -i, --inplace               update the yaml file inplace of first yaml file given.
-  -M, --no-colors             force print with no colors
-  -N, --no-doc                Don't print document separators (---)
-  -n, --null-input            Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-  -o, --output-format string  [yaml|y|json|j|props|p] output format type. (default "yaml")
-  -P, --prettyPrint           pretty print, shorthand for '... style = ""'
-      --unwrapScalar          unwrap scalar, print the value with no quotes, colors or comments (default true)
-  -v, --verbose               verbose mode
-  -V, --version               Print version information and quit
+  -C, --colors                        force print with colors
+  -e, --exit-status                   set exit status if there are no matches or null or false is returned
+  -f, --front-matter string           (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
+      --header-preprocess             Slurp any header comments and separators before processing expression. (default true)
+  -h, --help                          help for yq
+  -I, --indent int                    sets indent level for output (default 2)
+  -i, --inplace                       update the file in place of first file given.
+  -p, --input-format string           [yaml|y|xml|x] parse format for input. Note that json is a subset of yaml. (default "yaml")
+  -M, --no-colors                     force print with no colors
+  -N, --no-doc                        Don't print document separators (---)
+  -n, --null-input                    Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.
+  -o, --output-format string          [yaml|y|json|j|props|p|xml|x] output format type. (default "yaml")
+  -P, --prettyPrint                   pretty print, shorthand for '... style = ""'
+  -s, --split-exp string              print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.
+      --unwrapScalar                  unwrap scalar, print the value with no quotes, colors or comments (default true)
+  -v, --verbose                       verbose mode
+  -V, --version                       Print version information and quit
+      --xml-attribute-prefix string   prefix for xml attributes (default "+")
+      --xml-content-name string       name for xml content (if no attribute name is present). (default "+content")

 Use "yq [command] --help" for more information about a command.
 ```
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
 - Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
+- "yes", "no" were dropped as boolean values in the yaml 1.2 standard - which is the standard yq assumes.

 See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.
@@ -3,25 +3,25 @@
 testWriteInPlacePipeIn() {
  result=$(./yq e -i -n '.a' 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: write inplace flag only applicable when giving an expression and at least one file" "$result"
+  assertEquals "Error: write in place flag only applicable when giving an expression and at least one file" "$result"
 }

 testWriteInPlacePipeInEvalall() {
  result=$(./yq ea -i -n '.a' 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: write inplace flag only applicable when giving an expression and at least one file" "$result"
+  assertEquals "Error: write in place flag only applicable when giving an expression and at least one file" "$result"
 }

 testWriteInPlaceWithSplit() {
  result=$(./yq e -s "cat" -i '.a = "thing"' test.yml 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: write inplace cannot be used with split file" "$result"
+  assertEquals "Error: write in place cannot be used with split file" "$result"
 }

 testWriteInPlaceWithSplitEvalAll() {
  result=$(./yq ea -s "cat" -i '.a = "thing"' test.yml 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: write inplace cannot be used with split file" "$result"
+  assertEquals "Error: write in place cannot be used with split file" "$result"
 }

 testNullWithFiles() {
@@ -1,12 +1,236 @@
 #!/bin/bash

 setUp() {
-  rm test*.yml || true
+  rm test*.yml 2>/dev/null || true
+  rm .xyz 2>/dev/null || true
+  rm instructions.txt 2>/dev/null || true
 }

 testBasicEvalRoundTrip() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq ea test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq ea '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicPipeWithDot() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat test.yml | ./yq '.')
+  assertEquals "a: 123" "$X"
+}
+
+testBasicExpressionMatchesFileName() {
+  ./yq -n ".xyz = 123" > test.yml
+  touch .xyz
+  
+  X=$(./yq --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(./yq ea --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+}
+
+testBasicExpressionFromFile() {
+  ./yq -n ".xyz = 123" > test.yml
+  echo '.xyz = "meow" | .cool = "frog"' > instructions.txt
+  
+  X=$(./yq --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+
+  X=$(./yq ea --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+}
+
+testBasicExpressionFromFileDos() {
+  ./yq -n ".xyz = 123" > test.yml
+  echo '.xyz = "meow" | .cool = "frog"' | sed 's/$'"/`echo \\\r`/" > instructions.txt
+  
+  X=$(./yq --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+
+  X=$(./yq ea --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+}
+
+testBasicGitHubAction() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq e test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.yml)
+  assertEquals "a: 123" "$X"
+}
+
+testBasicGitHubActionWithExpression() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq e '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq ea '.a' test.yml)
+  assertEquals "123" "$X"
+}
+
+
+testBasicEvalAllAllFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(./yq ea test.yml test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+# when given a file, don't read STDIN
+# otherwise strange things start happening
+# in scripts
+# https://github.com/mikefarah/yq/issues/1115
+
+testBasicCatWithFilesNoDash() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml)
+  Y=$(./yq e '.' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+# when the nullinput flag is used
+# don't automatically read STDIN (this breaks github actions)
+testBasicCreateFileGithubAction() {
+  cat /dev/null | ./yq -n ".a = 123" > test.yml
+}
+
+testBasicEvalAllCatWithFilesNoDash() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea test2.yml)
+  Y=$(./yq e '.' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+
+testBasicStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalRoundTripNoEval() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicStdInWithOneArg() {
  ./yq e -n ".a = 123" > test.yml
-  X=$(./yq e '.a' test.yml)
+  X=$(cat test.yml | ./yq e ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ea ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ".a")
  assertEquals 123 "$X"
 }

@@ -19,6 +243,15 @@ EOL
  assertEquals "10" "$X"
 }

+testBasicUpdateInPlaceSequenceNoEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  ./yq -i ".a = 10" test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals "10" "$X"
+}
+
 testBasicUpdateInPlaceSequenceEvalAll() {
  cat >test.yml <<EOL
 a: 0
@@ -28,6 +261,40 @@ EOL
  assertEquals "10" "$X"
 }

+testBasicUpdateInPlaceMultipleFilesNoExpressionEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  cat >test2.yml <<EOL
+a: 1
+EOL
+read -r -d '' expected << EOM
+0
+---
+1
+EOM
+  ./yq -i test.yml test2.yml
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicUpdateInPlaceMultipleFilesNoExpressionEvalAll() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  cat >test2.yml <<EOL
+a: 1
+EOL
+read -r -d '' expected << EOM
+0
+---
+1
+EOM
+  ./yq -i ea test.yml test2.yml
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
 testBasicNoExitStatus() {
  echo "a: cat" > test.yml
  X=$(./yq e '.z' test.yml)
@@ -40,7 +307,13 @@ testBasicExitStatus() {
  assertEquals 1 "$?"
 }

-testBasicExtractFieldWithSeperator() {
+testBasicExitStatusNoEval() {
+  echo "a: cat" > test.yml
+  X=$(./yq -e '.z' test.yml 2&>/dev/null)
+  assertEquals 1 "$?"
+}
+
+testBasicExtractFieldWithSeparator() {
    cat >test.yml <<EOL
 ---
 name: chart-name
@@ -50,7 +323,7 @@ EOL
  assertEquals "chart-name" "$X"
 }

-testBasicExtractMultipleFieldWithSeperator() {
+testBasicExtractMultipleFieldWithSeparator() {
    cat >test.yml <<EOL
 ---
 name: chart-name
@@ -69,4 +342,32 @@ EOM
  assertEquals "$expected" "$X"
 }

+testBasicMultiplyAssignMultiDoc() {
+      cat >test.yml <<EOL
+a: 1
+---
+b: 2
+EOL
+
+read -r -d '' expected << EOM
+a: 1
+c: 3
+---
+b: 2
+c: 3
+EOM
+
+
+  X=$(./yq '. *= {"c":3}' test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicClosedStdIn() {
+  cat >test.yml <<EOL
+a: 1
+EOL
+  X=$(./yq e '.a' test.yml <&-)
+  assertEquals "1" "$X"
+}
+
 source ./scripts/shunit2
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+testCompletionRuns() {
+    result=$(./yq __complete "" 2>&1)
+    assertEquals 0 $?
+    assertContains "$result" "Completion ended with directive:"
+}
+
+source ./scripts/shunit2
@@ -9,7 +9,7 @@ EOL

 testEmptyEval() {
  X=$(./yq e test.yml)
-  expected=$(cat test.yml)
+  expected="# comment"
  assertEquals 0 $?
  assertEquals "$expected" "$X"
 }
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+# comment
+EOL
+}
+
+testStringInterpolation() {
+    X=$(./yq -n '"Mike \(3 + 4)"')
+    assertEquals "Mike 7" "$X"
+}
+
+testNoStringInterpolation() {
+    X=$(./yq --string-interpolation=f -n '"Mike \(3 + 4)"')
+    assertEquals "Mike \(3 + 4)" "$X"
+}
+
+
+source ./scripts/shunit2
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  
+}
+
+testLineCountFirstLineComment() {
+  cat >test.yml <<EOL
+#test123 
+abc: 123 
+test123: 123123 
+#comment 
+lalilu: lalilu
+EOL
+
+  X=$(./yq '.lalilu | line' --header-preprocess=false < test.yml)
+  assertEquals "5" "$X"
+}
+
+testArrayOfDocs() {
+  cat >test.yml <<EOL
+---
+# leading comment doc 1
+a: 1
+---
+# leading comment doc 2
+a: 2
+EOL
+
+read -r -d '' expected << EOM
+- # leading comment doc 1
+  a: 1
+- # leading comment doc 2
+  a: 2
+EOM
+
+  X=$(./yq ea '[.]' --header-preprocess=false < test.yml)
+  assertEquals "$expected" "$X"
+
+}
+
+source ./scripts/shunit2
@@ -0,0 +1,249 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml 2>/dev/null || true
+  rm test*.toml 2>/dev/null || true
+  rm test*.tfstate 2>/dev/null || true
+  rm test*.json 2>/dev/null || true
+  rm test*.properties 2>/dev/null || true
+  rm test*.csv 2>/dev/null || true
+  rm test*.tsv 2>/dev/null || true
+  rm test*.xml 2>/dev/null || true
+}
+
+testInputJson() {
+  cat >test.json <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+{
+  "mike": {
+    "things": "cool"
+  }
+}
+EOM
+
+  X=$(./yq test.json)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.json)
+  assertEquals "$expected" "$X"
+}
+
+testInputToml() {
+  cat >test.toml <<EOL
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00
+EOL
+
+  read -r -d '' expected << EOM
+owner:
+  name: Tom Preston-Werner
+  dob: 1979-05-27T07:32:00-08:00
+EOM
+
+  X=$(./yq -oy test.toml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -oy test.toml)
+  assertEquals "$expected" "$X"
+}
+
+testInputTfstate() {
+  cat >test.tfstate <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+{"mike": {"things": "cool"}}
+EOM
+
+  X=$(./yq test.tfstate)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.tfstate)
+  assertEquals "$expected" "$X"
+}
+
+testInputJsonOutputYaml() {
+  cat >test.json <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: cool
+EOM
+
+  X=$(./yq test.json -oy)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.json -oy)
+  assertEquals "$expected" "$X"
+}
+
+testInputProperties() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike.things = hello
+EOM
+
+  X=$(./yq e test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputPropertiesGitHubAction() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike.things = hello
+EOM
+
+  X=$(cat /dev/null | ./yq e test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+fruit,yumLevel
+apple,5
+banana,4
+EOM
+
+  X=$(./yq e test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVUTF8() {
+  read -r -d '' expected << EOM
+id,first,last
+1,john,smith
+1,jane,smith
+EOM
+
+  X=$(./yq utf8.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSV() {
+  cat >test.tsv <<EOL
+fruit	yumLevel
+apple	5
+banana	4
+EOL
+
+  read -r -d '' expected << EOM
+fruit	yumLevel
+apple	5
+banana	4
+EOM
+
+  X=$(./yq e test.tsv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.tsv)
+  assertEquals "$expected" "$X"
+}
+
+
+
+
+testInputXml() {
+  cat >test.xml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+<cat legs="4">BiBi</cat>
+EOM
+
+  X=$(./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlNamespaces() {
+  cat >test.xml <<EOL
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+EOL
+
+  read -r -d '' expected << EOM
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url"></map>
+EOM
+
+  X=$(./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+
+
+testInputXmlStrict() {
+  cat >test.xml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Catherine.">
+<!ENTITY copyright "(r) Great">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+EOL
+
+  X=$(./yq --xml-strict-mode test.xml  2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: bad file 'test.xml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+
+  X=$(./yq ea --xml-strict-mode test.xml  2>&1)
+  assertEquals "Error: bad file 'test.xml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+}
+
+testInputXmlGithubAction() {
+  cat >test.xml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+<cat legs="4">BiBi</cat>
+EOM
+
+  X=$(cat /dev/null | ./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2
@@ -1,9 +1,161 @@
 #!/bin/bash

 setUp() {
-  rm test*.yml || true
+  rm test*.yml 2>/dev/null || true
+  rm test*.properties 2>/dev/null || true
+  rm test*.csv 2>/dev/null || true
+  rm test*.tsv 2>/dev/null || true
+  rm test*.xml 2>/dev/null || true
 }

+testInputProperties() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputPropertiesGitHubAction() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=csv test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=csv test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVCustomSeparator() {
+  cat >test.csv <<EOL
+fruit;yumLevel
+apple;5
+banana;4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq -p=csv --csv-separator ";" test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=csv --csv-separator ";" test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVNoAuto() {
+  cat >test.csv <<EOL
+thing1
+name: cat
+EOL
+
+  read -r -d '' expected << EOM
+- thing1: 'name: cat'
+EOM
+
+  X=$(./yq --csv-auto-parse=f test.csv -oy)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --csv-auto-parse=f test.csv -oy)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSVNoAuto() {
+  cat >test.tsv <<EOL
+thing1
+name: cat
+EOL
+
+  read -r -d '' expected << EOM
+- thing1: 'name: cat'
+EOM
+
+  X=$(./yq --tsv-auto-parse=f test.tsv -oy)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --tsv-auto-parse=f test.tsv -oy)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVUTF8() {
+  read -r -d '' expected << EOM
+- id: 1
+  first: john
+  last: smith
+- id: 1
+  first: jane
+  last: smith
+EOM
+
+  X=$(./yq -p=csv utf8.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSV() {
+  cat >test.tsv <<EOL
+fruit	yumLevel
+apple	5
+banana	4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=t test.tsv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=t test.tsv)
+  assertEquals "$expected" "$X"
+}
+
+
+
+
 testInputXml() {
  cat >test.yml <<EOL
 <cat legs="4">BiBi</cat>
@@ -12,7 +164,7 @@ EOL
  read -r -d '' expected << EOM
 cat:
  +content: BiBi
-  +legs: "4"
+  +@legs: "4"
 EOM

  X=$(./yq e -p=xml test.yml)
@@ -22,4 +174,85 @@ EOM
  assertEquals "$expected" "$X"
 }

+testInputXmlNamespaces() {
+  cat >test.xml <<EOL
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+EOL
+
+  read -r -d '' expected << EOM
+p_xml: version="1.0"
+map:
+  +@xmlns: some-namespace
+  +@xmlns:xsi: some-instance
+  +@xsi:schemaLocation: some-url
+EOM
+
+  X=$(./yq e -p=xml test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.xml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlRoundtrip() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
+EOL
+
+  read -r -d '' expected << EOM
+<?xml version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
+EOM
+
+  X=$(./yq -p=xml -o=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml -o=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testInputXmlStrict() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Catherine.">
+<!ENTITY copyright "(r) Great">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+EOL
+
+  X=$(./yq -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+
+  X=$(./yq ea -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+}
+
+testInputXmlGithubAction() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +@legs: "4"
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
 source ./scripts/shunit2
@@ -1,5 +1,8 @@
 #!/bin/bash

+
+# examples where header-preprocess is required
+
 setUp() {
  rm test*.yml || true
  cat >test.yml <<EOL
@@ -8,7 +11,7 @@ a: test
 EOL
 }

-testLeadingSeperatorWithDoc() {
+testLeadingSeparatorWithDoc() {
  cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -31,18 +34,94 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorPipeIntoEvalSeq() {
+
+testLeadingSeparatorWithNewlinesNewDoc() {
+  cat >test.yml <<EOL
+# hi peeps
+# cool
+
+
+---
+a: test
+---
+b: cool
+EOL
+
+  read -r -d '' expected << EOM
+# hi peeps
+# cool
+
+
+---
+a: thing
+---
+b: cool
+EOM
+
+  X=$(./yq e '(select(di == 0) | .a) = "thing"' - < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testLeadingSeparatorWithNewlinesMoreComments() {
+  cat >test.yml <<EOL
+# hi peeps
+# cool
+
+---
+# great
+
+a: test
+---
+b: cool
+EOL
+
+  read -r -d '' expected << EOM
+# hi peeps
+# cool
+
+---
+# great
+
+a: thing
+---
+b: cool
+EOM
+
+  X=$(./yq e '(select(di == 0) | .a) = "thing"' - < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testLeadingSeparatorWithDirective() {
+  cat >test.yml <<EOL
+%YAML 1.1
+---
+this: should really work
+EOL
+
+  read -r -d '' expected << EOM
+%YAML 1.1
+---
+this: should really work
+EOM
+
+  X=$(./yq < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testLeadingSeparatorPipeIntoEvalSeq() {
  X=$(./yq e - < test.yml)
  expected=$(cat test.yml)
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorExtractField() {
+testLeadingSeparatorExtractField() {
  X=$(./yq e '.a' - < test.yml)
  assertEquals "test" "$X"
 }

-testLeadingSeperatorExtractFieldWithCommentsAfterSep() {
+testLeadingSeparatorExtractFieldWithCommentsAfterSep() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -53,7 +132,7 @@ EOL
  assertEquals "test" "$X"
 }

-testLeadingSeperatorExtractFieldWithCommentsBeforeSep() {
+testLeadingSeparatorExtractFieldWithCommentsBeforeSep() {
  cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -65,7 +144,7 @@ EOL
 }


-testLeadingSeperatorExtractFieldMultiDoc() {
+testLeadingSeparatorExtractFieldMultiDoc() {
  cat >test.yml <<EOL
 ---
 a: test
@@ -82,13 +161,13 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorExtractFieldMultiDocWithComments() {
+testLeadingSeparatorExtractFieldMultiDocWithComments() {
  cat >test.yml <<EOL
 # here
 ---
 # there
 a: test
-# whereever
+# wherever
 ---
 # you are
 a: test2
@@ -105,26 +184,26 @@ EOM
 }


-testLeadingSeperatorEvalSeq() {
+testLeadingSeparatorEvalSeq() {
  X=$(./yq e test.yml)
  expected=$(cat test.yml)
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorPipeIntoEvalAll() {
+testLeadingSeparatorPipeIntoEvalAll() {
  X=$(./yq ea - < test.yml)
  expected=$(cat test.yml)
  assertEquals "$expected" "$X"
 }


-testLeadingSeperatorEvalAll() {
+testLeadingSeparatorEvalAll() {
  X=$(./yq ea test.yml)
  expected=$(cat test.yml)
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalSimple() {
+testLeadingSeparatorMultiDocEvalSimple() {
  read -r -d '' expected << EOM
 ---
 a: test
@@ -138,7 +217,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocInOneFile() {
+testLeadingSeparatorMultiDocInOneFile() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -152,7 +231,7 @@ EOL
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocInOneFileEvalAll() {
+testLeadingSeparatorMultiDocInOneFileEvalAll() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -166,7 +245,7 @@ EOL
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalComments() {
+testLeadingSeparatorMultiDocEvalComments() {
  cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -194,7 +273,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalCommentsTrailingSep() {
+testLeadingSeparatorMultiDocEvalCommentsTrailingSep() {
  cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -226,7 +305,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiMultiDocEvalCommentsTrailingSep() {
+testLeadingSeparatorMultiMultiDocEvalCommentsTrailingSep() {
  cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -266,7 +345,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalCommentsLeadingSep() {
+testLeadingSeparatorMultiDocEvalCommentsLeadingSep() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -326,7 +405,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalCommentsStripComments() {
+testLeadingSeparatorMultiDocEvalCommentsStripComments() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -349,7 +428,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalCommentsLeadingSepNoDocFlag() {
+testLeadingSeparatorMultiDocEvalCommentsLeadingSepNoDocFlag() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -375,7 +454,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalJsonFlag() {
+testLeadingSeparatorMultiDocEvalJsonFlag() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -404,7 +483,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalAllJsonFlag() {
+testLeadingSeparatorMultiDocEvalAllJsonFlag() {
  cat >test.yml <<EOL
 ---
 # hi peeps
@@ -433,7 +512,7 @@ EOM
  assertEquals "$expected" "$X"
 }

-testLeadingSeperatorMultiDocEvalAll() {
+testLeadingSeparatorMultiDocEvalAll() {
  read -r -d '' expected << EOM
 ---
 a: test
@@ -9,7 +9,7 @@ testLoadFileNotExist() {
 testLoadFileExpNotExist() {
  result=$(./yq e -n 'load(.a)' 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: Filename expression returned nil" "$result"
+  assertEquals "Error: filename expression returned nil" "$result"
 }

 testStrLoadFileNotExist() {
@@ -21,7 +21,7 @@ testStrLoadFileNotExist() {
 testStrLoadFileExpNotExist() {
  result=$(./yq e -n 'strload(.a)' 2>&1)
  assertEquals 1 $?
-  assertEquals "Error: Filename expression returned nil" "$result"
+  assertEquals "Error: filename expression returned nil" "$result"
 }

 source ./scripts/shunit2
@@ -0,0 +1,286 @@
+#!/bin/bash
+
+setUp() {
+    rm test*.yml || true
+}
+
+## Convenient bash shortcut to read records of NUL separated values
+## from stdin the safe way. See example usage in the next tests.
+read-0() {
+    local eof="" IFS=''
+    while [ "$1" ]; do
+        ## - The `-r` avoids bad surprise with '\n' and other interpreted
+        ##   sequences that can be read.
+        ## - The `-d ''` is the (strange?) way to refer to NUL delimiter.
+        ## - The `--` is how to avoid unpleasant surprises if your
+        ##   "$1" starts with "-" (minus) sign. This protection also
+        ##   will produce a readable error if you want to try to start
+        ##   your variable names with a "-".
+        read -r -d '' -- "$1" || eof=1
+        shift
+    done
+    [ -z "$eof" ] ## fail on EOF
+}
+
+## Convenient bash shortcut to be used with the next function `p-err`
+## to read NUL separated values the safe way AND catch any errors from
+## the process creating the stream of NUL separated data.  See example
+## usage in the tests.
+read-0-err() {
+    local ret="$1" eof="" idx=0 last=
+    read -r -- "${ret?}" <<<"0"
+    shift
+    while [ "$1" ]; do
+        last=$idx
+        read -r -d '' -- "$1" || {
+            ## Put this last value in ${!ret}
+            eof="$1"
+            read -r -- "$ret" <<<"${!eof}"
+            break
+        }
+        ((idx++))
+        shift
+    done
+    [ -z "$eof" ] || {
+        if [ "$last" != 0 ]; then
+            ## Uhoh, we have no idea if the errorlevel of the internal
+            ## command was properly delimited with a NUL char, and
+            ## anyway something went really wrong at least about the
+            ## number of fields separated by NUL char and the one
+            ## expected.
+            echo "Error: read-0-err couldn't fill all value $ret = '${!ret}', '$eof', '${!eof}'" >&2
+            read -r -- "$ret" <<<"not-enough-values"
+        else
+            if ! [[ "${!ret}" =~ ^[0-9]+$ && "${!ret}" -ge 0 && "${!ret}" -le 127 ]]; then
+                ## This could happen if you don't use `p-err` wrapper,
+                ## or used stdout in unexpected ways in your inner
+                ## command.
+                echo "Error: last value is not a number, did you finish with an errorlevel ?" >&2
+                read -r -- "$ret" <<<"last-value-not-a-number"
+            fi
+        fi
+        false
+    }
+}
+
+## Simply runs command given as argument and adds errorlevel in the
+## standard output. Is expected to be used in tandem with
+## `read-0-err`.
+p-err() {
+    local exp="$1"
+    "$@"
+    printf "%s" "$?"
+}
+
+wyq-r() {
+    local exp="$1"
+    ./yq e -0 -r=false "$1"
+    printf "%s" "$?"
+}
+
+testBasicUsageRaw() {
+  cat >test.yml <<EOL
+a: foo
+b: bar
+EOL
+
+  printf "foo\0bar\0" > expected.out
+
+  ## We need to compare binary content here. We have to filter the compared
+  ## content through a representation that gets rid of NUL chars but accurately
+  ## transcribe the content.
+  ## Also as it would be nice to have a pretty output in case the test fails,
+  ## we use here 'hd': a widely available shortcut to 'hexdump' that will
+  ## pretty-print any binary to it's hexadecimal representation.
+  ##
+  ## Note that the standard `assertEquals` compare its arguments
+  ## value, but they can't hold NUL characters (this comes from the
+  ## limitation of the C API of `exec*(..)` functions that requires
+  ## `const char *arv[]`). And these are NUL terminated strings.  As a
+  ## consequence, the NUL characters gets removed in bash arguments.
+  assertEquals "$(hd expected.out)" \
+               "$(./yq e -0 '.a, .b' test.yml | hd)"
+
+  rm expected.out
+}
+
+testBasicUsage() {
+  local a b
+  cat >test.yml <<EOL
+a: foo
+b: bar
+EOL
+
+  ## We provide 2 values, and ask to fill 2 variables.
+  read-0 a b < <(./yq e -0 '.a, .b' test.yml)
+  assertEquals "$?" "0"      ## Everything is fine
+  assertEquals "foo" "$a"    ## Values are correctly parsed
+  assertEquals "bar" "$b"
+
+  a=YYY ; b=XXX
+  ## Not enough values provided to fill `a` and `b`.
+  read-0 a b < <(./yq e -0 '.a' test.yml)
+  assertEquals "$?" "1"      ## An error was emitted
+  assertEquals "foo" "$a"    ## First value was correctly parsed
+  assertEquals "" "$b"       ## Second was still reset
+
+  ## Error from inner command are not catchable !. Use
+  ## `read-0-err`/`p-err` for that.
+  read-0 a < <(printf "\0"; ./yq e -0 'xxx' test.yml; )
+  assertEquals "$?" "0"
+
+}
+
+testBasicUsageJson() {
+  cat >test.yml <<EOL
+a:
+  x: foo
+b: bar
+EOL
+
+  read-0 a b < <(./yq e -0 -o=json '.a, .b' test.yml)
+
+  assertEquals '{
+  "x": "foo"
+}' "$a"
+  assertEquals '"bar"' "$b"
+
+}
+
+testFailWithValueContainingNUL() {
+  local a b c
+  ## Note that value of field 'a' actually contains a NUL char !
+  cat >test.yml <<EOL
+a: "foo\u0000bar"
+b: 1
+c: |
+  wiz
+  boom
+EOL
+
+  ## We are looking for trouble with asking to separated fields with NUL
+  ## char and requested value `.a` actually contains itself a NUL char !
+  read-0 a b c < <(./yq e -0 '.a, .b, .c' test.yml)
+  assertNotEquals "0" "$?"   ## read-0 failed to fill all values
+
+  ## But here, we can request for one value, even if `./yq` fails
+  read-0 b < <(./yq e -0 '.b, .a' test.yml)
+  assertEquals "0" "$?"   ## read-0 succeeds at feeding the first value
+  ## Note: to catch the failure of `yq`, see in the next tests the usage
+  ## of `read-0-err`.
+
+  ## using -r=false solves any NUL containing value issues, but keeps
+  ## all in YAML representation:
+  read-0 a b c < <(./yq e -0 -r=false '.a, .b, .c' test.yml)
+  assertEquals "0" "$?"    ## All goes well despite asking for `a` value
+
+  assertEquals '"foo\0bar"' "$a"   ## This is a YAML string representation
+  assertEquals '1' "$b"
+  assertEquals '|
+  wiz
+  boom' "$c"
+}
+
+testStandardLoop() {
+    local E a b res
+
+    ## Here everything is normal: 4 values, that will be paired
+    ## in key/values.
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- pow
+EOL
+
+    res=""
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+
+    assertEquals "0" "$E"                     ## errorlevel of internal command
+    assertEquals "yay: wiz;hop: pow;" "$res"  ## expected result
+}
+
+testStandardLoopWithoutEnoughValues() {
+    local E a b res
+
+    ## Here 5 values, there will be a missing value when reading
+    ## pairs of value.
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- pow
+- kwak
+EOL
+
+    res=""
+    ## The loop will succeed 2 times then fail
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+
+    assertEquals "not-enough-values" "$E"     ## Not enough value error
+    assertEquals "yay: wiz;hop: pow;" "$res"  ## the 2 full key/value pairs
+
+}
+
+testStandardLoopWithInternalCmdError() {
+    local E a b res
+
+    ## Note the third value contains a NUL char !
+    cat >test.yml <<EOL
+- yay
+- wiz
+- "foo\0bar"
+- hop
+- pow
+EOL
+
+    res=""
+    ## It should be only upon the second pass in the loop that
+    ## read-0-err will catch the fact that there is an error !
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+    assertEquals "1" "$E"            ## Internal command errorlevel (from `./yq`)
+    assertEquals "yay: wiz;" "$res"  ## first 2 values were ok at least
+
+}
+
+testStandardLoopNotEnoughErrorEatsCmdError() {
+    local E a b res
+
+    ## Because of possible edge cases where the internal errorlevel
+    ## reported by `p-err` in the standard output might be mangled
+    ## with the unfinished record, `read-0-err E ...` will NOT report
+    ## the internal command error in the variable E and instead will
+    ## store the value 'not-enough-values'. In real world, anyway, you
+    ## will want to react the same if the internal command failed
+    ## and/or you didn't get as much values as expected while
+    ## reading. Keep in mind also that standard error is not
+    ## swallowed, so you can read reports from the inner command AND
+    ## from `read-0-err`.
+
+    ## Here, note that the fourth value contains a NUL char !
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- "foo\0bar"
+- pow
+EOL
+
+    res=""
+    ## It should be only upon the second loop that read-0-err will catch
+    ## the fact that there are not enough data to fill the requested variables
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+    assertEquals "not-enough-values" "$E"          ## Not enough values error eats internal error !
+    assertEquals "yay: wiz;" "$res"  ## first 2 values were ok at least
+}
+
+
+source ./scripts/shunit2
@@ -48,6 +48,64 @@ EOM
  assertEquals "$expected" "$X"
 }

+testOutputYamlRawDefault() {
+  cat >test.yml <<EOL
+a: "cat"
+EOL
+
+  X=$(./yq e  '.a' test.yml)
+  assertEquals "cat" "$X"
+
+  X=$(./yq ea '.a' test.yml)
+  assertEquals "cat" "$X"
+}
+
+testOutputYamlRawOff() {
+  cat >test.yml <<EOL
+a: "cat"
+EOL
+
+  X=$(./yq e -r=false '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+
+  X=$(./yq ea -r=false '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+}
+
+testOutputYamlRawOnRoot() {
+  cat >test.yml <<EOL
+'a'
+EOL
+
+  X=$(./yq e -r '.' test.yml)
+  assertEquals "a" "$X"
+}
+
+testOutputJsonRaw() {
+  cat >test.yml <<EOL
+a: cat
+EOL
+
+  X=$(./yq e -r --output-format=json '.a' test.yml)
+  assertEquals "cat" "$X"
+
+  X=$(./yq ea -r --output-format=json '.a' test.yml)
+  assertEquals "cat" "$X"
+}
+
+testOutputJsonDefault() {
+  cat >test.yml <<EOL
+a: cat
+EOL
+
+  X=$(./yq e --output-format=json '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+
+  X=$(./yq ea --output-format=json '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+}
+
+
 testOutputJsonShort() {
  cat >test.yml <<EOL
 a: {b: ["cat"]}
@@ -72,11 +130,11 @@ EOM

 testOutputProperties() {
  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
+a: {b: {c: ["cat cat"]}}
 EOL

  read -r -d '' expected << EOM
-a.b.c.0 = cat
+a.b.c.0 = cat cat
 EOM

  X=$(./yq e --output-format=props test.yml)
@@ -86,13 +144,30 @@ EOM
  assertEquals "$expected" "$X"
 }

-testOutputPropertiesShort() {
+testOutputPropertiesDontUnwrap() {
  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
+a: {b: {c: ["cat cat"]}}
 EOL

  read -r -d '' expected << EOM
-a.b.c.0 = cat
+a.b.c.0 = "cat cat"
+EOM
+
+  X=$(./yq e -r=false --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -r=false --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testOutputPropertiesShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+a.b.c.0 = cat cat
 EOM

  X=$(./yq e -o=p test.yml)
@@ -102,6 +177,69 @@ EOM
  assertEquals "$expected" "$X"
 }

+testOutputCSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit,yumLevel
+apple,5
+banana,4
+EOM
+
+  X=$(./yq -o=c test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=csv test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputCSVCustomSeparator() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit;yumLevel
+apple;5
+banana;4
+EOM
+
+  X=$(./yq -oc --csv-separator ";" test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=csv --csv-separator ";" test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputTSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit	yumLevel
+apple	5
+banana	4
+EOM
+
+  X=$(./yq -o=t test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=tsv test.yml)
+  assertEquals "$expected" "$X"
+}
+
 testOutputXml() {
  cat >test.yml <<EOL
 a: {b: {c: ["cat"]}}
@@ -144,7 +282,7 @@ EOM

 testOutputXmComplex() {
  cat >test.yml <<EOL
-a: {b: {c: ["cat", "dog"], +f: meow}}
+a: {b: {c: ["cat", "dog"], +@f: meow}}
 EOL

  read -r -d '' expected << EOM
@@ -163,4 +301,43 @@ EOM
  assertEquals "$expected" "$X"
 }

-source ./scripts/shunit2
+testLuaOutputPretty() {
+  cat >test.yml <<EOL
+animals:
+  cat: meow
+EOL
+
+  read -r -d '' expected << EOM
+return {
+	["animals"] = {
+		["cat"] = "meow";
+	};
+};
+EOM
+
+  X=$(./yq e --output-format=lua test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq e --output-format=lua --prettyPrint test.yml)
+  assertEquals "$expected" "$X"
+
+}
+
+testLuaOutputSubset() {
+  cat >test.yml <<EOL
+animals:
+  cat: meow
+EOL
+
+  read -r -d '' expected << EOM
+return {
+	["cat"] = "meow";
+};
+EOM
+
+  X=$(./yq e --output-format=lua '.animals' test.yml)
+  assertEquals "$expected" "$X"
+
+}
+
+source ./scripts/shunit2
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+a: frog
+EOL
+}
+
+testPipeViaCatWithParam() {
+  X=$(cat test.yml | ./yq '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEval() {
+  X=$(cat test.yml | ./yq e '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEvalAll() {
+  X=$(cat test.yml | ./yq ea '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatNoParam() {
+  X=$(cat test.yml | ./yq)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEval() {
+  X=$(cat test.yml | ./yq e)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEvalAll() {
+  X=$(cat test.yml | ./yq ea)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishWithParam() {
+  X=$(./yq '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEval() {
+  X=$(./yq e '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEvalAll() {
+  X=$(./yq ea '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishNoParam() {
+  X=$(./yq < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEval() {
+  X=$(./yq e < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEvalAll() {
+  X=$(./yq ea < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+source ./scripts/shunit2
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yq || true
+  cat >test.yq <<EOL
+#!./yq
+.a.b
+EOL
+chmod +x test.yq
+
+rm test*.yml || true
+  cat >test.yml <<EOL
+a: {b: apple}
+EOL
+}
+
+testCanExecYqFile() {
+  read -r -d '' expected << EOM
+apple
+EOM
+   X=$(./test.yq test.yml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2
+
@@ -25,6 +25,56 @@ EOM
  assertEquals "$expectedDoc2" "$doc2"
 }

+testBasicSplitWithNameCustomExtension() {
+  rm test*.yaml || true
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq e test.yml -s '.a + ".yaml"'
+
+  doc1=$(cat test_doc1.yaml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_doc2.yaml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
+
+
+
+testSplitFromFile() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+cat >test_splitExp.yml <<EOL
+.a
+EOL
+
+  ./yq test.yml --split-exp-file test_splitExp.yml
+
+  doc1=$(cat test_doc1.yml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_doc2.yml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
 testBasicSplitWithNameEvalAll() {
  cat >test.yml <<EOL
 a: test_doc1
@@ -12,6 +12,6 @@ outputs:
    description: "The complete result from the yq command being run"
 runs:
  using: 'docker'
-  image: 'github-action/Dockerfile'
+  image: 'docker://mikefarah/yq:4-githubaction'
  args:
    - ${{ inputs.cmd }}
@@ -1,83 +0,0 @@
-package cmd
-
-// import (
-// 	"strings"
-// 	"testing"
-
-// 	"github.com/mikefarah/yq/v3/test"
-// 	"github.com/spf13/cobra"
-// )
-
-// func getRootCommand() *cobra.Command {
-// 	return New()
-// }
-
-// func TestRootCmd(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "Usage:") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_Help(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--help")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "yq is a lightweight and portable command-line YAML processor. It aims to be the jq or sed of yaml files.") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VerboseLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--verbose")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VerboseShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-v")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VersionShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-V")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VersionLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--version")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }
@@ -1,15 +1,15 @@
 package cmd

-var leadingContentPreProcessing = true
-var unwrapScalar = true
+var unwrapScalarFlag = newUnwrapFlag()
+
+var unwrapScalar = false

 var writeInplace = false
 var outputToJSON = false
-var outputFormat = "yaml"
-var inputFormat = "yaml"

-var xmlAttributePrefix = "+"
-var xmlContentName = "+content"
+var outputFormat = ""
+
+var inputFormat = ""

 var exitStatus = false
 var forceColor = false
@@ -18,6 +18,7 @@ var colorsEnabled = false
 var indent = 2
 var noDocSeparators = false
 var nullInput = false
+var nulSepOutput = false
 var verbose = false
 var version = false
 var prettyPrint = false
@@ -26,5 +27,10 @@ var prettyPrint = false
 var frontMatter = ""

 var splitFileExp = ""
+var splitFileExpFile = ""

 var completedSuccessfully = false
+
+var forceExpression = ""
+
+var expressionFile = ""
@@ -2,7 +2,6 @@ package cmd

 import (
 	"errors"
-	"os"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -13,8 +12,14 @@ func createEvaluateAllCommand() *cobra.Command {
 		Use:     "eval-all [expression] [yaml_file1]...",
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) == 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			return nil, cobra.ShellCompDirectiveDefault
+		},
 		Example: `
-# Merge f2.yml into f1.yml (inplace)
+# Merge f2.yml into f1.yml (in place)
 yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml
 ## the same command and expression using shortened names:
 yq ea -i 'select(fi == 0) * select(fi == 1)' f1.yml f2.yml
@@ -27,7 +32,7 @@ yq ea '. as $item ireduce ({}; . * $item )' file1.yml file2.yml ...
 ## use '-' as a filename to pipe from STDIN
 cat file2.yml | yq ea '.a.b' file1.yml - file3.yml
 `,
-		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
+		Long: `yq is a portable command-line data file processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.

 ## Evaluate All ##
@@ -47,20 +52,17 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {

 	var err error

-	firstFileIndex, err := initCommand(cmd, args)
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}

-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-
 	out := cmd.OutOrStdout()

 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -74,28 +76,37 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 		}()
 	}

-	format, err := yqlib.OutputFormatFromString(outputFormat)
+	format, err := yqlib.FormatFromString(outputFormat)
 	if err != nil {
 		return err
 	}

-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(true)
 	if err != nil {
 		return err
 	}

-	printerWriter := configurePrinterWriter(format, out)
-	encoder := configureEncoder(format)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder, err := configureEncoder()
+	if err != nil {
+		return err
+	}

 	printer := yqlib.NewPrinter(encoder, printerWriter)
+	if nulSepOutput {
+		printer.SetNulSepOutput(true)
+	}

 	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
+		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
 		err = frontMatterHandler.Split()
 		if err != nil {
 			return err
 		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
+		args[0] = frontMatterHandler.GetYamlFrontMatterFilename()

 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -106,22 +117,17 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	}

 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
+
 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
+		if nullInput {
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
-		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}

 	completedSuccessfully = err == nil
@@ -3,7 +3,6 @@ package cmd
 import (
 	"errors"
 	"fmt"
-	"os"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -13,7 +12,13 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "Apply the expression to each document in each yaml file in sequence",
+		Short:   "(default) Apply the expression to each document in each yaml file in sequence",
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) == 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			return nil, cobra.ShellCompDirectiveDefault
+		},
 		Example: `
 # Reads field under the given path for each file
 yq e '.a.b' f1.yml f2.yml 
@@ -29,10 +34,10 @@ cat file2.yml | yq e '.a.b' file1.yml - file3.yml
 ## Note that editing an empty file does not work.
 yq e -n '.a.b.c = "cat"' 

-# Update a file inplace
+# Update a file in place
 yq e '.a.b = "cool"' -i file.yaml 
 `,
-		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
+		Long: `yq is a portable command-line data file processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.

 ## Evaluate Sequence ##
@@ -44,11 +49,11 @@ expression and prints the result in sequence.`,
 }

 func processExpression(expression string) string {
-	var prettyPrintExp = `(... | (select(tag != "!!str"), select(tag == "!!str") | select(test("(?i)^(y|yes|n|no|on|off)$") | not))  ) style=""`
+
 	if prettyPrint && expression == "" {
-		return prettyPrintExp
+		return yqlib.PrettyPrintExp
 	} else if prettyPrint {
-		return fmt.Sprintf("%v | %v", expression, prettyPrintExp)
+		return fmt.Sprintf("%v | %v", expression, yqlib.PrettyPrintExp)
 	}
 	return expression
 }
@@ -59,21 +64,19 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	// 1 arg, read file in sequence
 	// 2+ args, [0] = expression, file the rest

+	out := cmd.OutOrStdout()
+
 	var err error
-	firstFileIndex, err := initCommand(cmd, args)
+
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}

-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-
-	out := cmd.OutOrStdout()
-
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -87,30 +90,39 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 		}()
 	}

-	format, err := yqlib.OutputFormatFromString(outputFormat)
+	format, err := yqlib.FormatFromString(outputFormat)
 	if err != nil {
 		return err
 	}

-	printerWriter := configurePrinterWriter(format, out)
-	encoder := configureEncoder(format)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder, err := configureEncoder()
+	if err != nil {
+		return err
+	}

 	printer := yqlib.NewPrinter(encoder, printerWriter)
+	if nulSepOutput {
+		printer.SetNulSepOutput(true)
+	}

-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(false)
 	if err != nil {
 		return err
 	}
-
 	streamEvaluator := yqlib.NewStreamEvaluator()

 	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
+		yqlib.GetLogger().Debug("using front matter handler")
+		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
 		err = frontMatterHandler.Split()
 		if err != nil {
 			return err
 		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
+		args[0] = frontMatterHandler.GetYamlFrontMatterFilename()

 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -122,20 +134,14 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {

 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
+		if nullInput {
+			err = streamEvaluator.EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
-		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}
 	completedSuccessfully = err == nil

@@ -1,45 +1,91 @@
 package cmd

 import (
+	"fmt"
 	"os"
+	"strings"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
 	logging "gopkg.in/op/go-logging.v1"
 )

+type runeValue rune
+
+func newRuneVar(p *rune) *runeValue {
+	return (*runeValue)(p)
+}
+
+func (r *runeValue) String() string {
+	return string(*r)
+}
+
+func (r *runeValue) Set(rawVal string) error {
+	val := strings.ReplaceAll(rawVal, "\\n", "\n")
+	val = strings.ReplaceAll(val, "\\t", "\t")
+	val = strings.ReplaceAll(val, "\\r", "\r")
+	val = strings.ReplaceAll(val, "\\f", "\f")
+	val = strings.ReplaceAll(val, "\\v", "\v")
+	if len(val) != 1 {
+		return fmt.Errorf("[%v] is not a valid character. Must be length 1 was %v", val, len(val))
+	}
+	*r = runeValue(rune(val[0]))
+	return nil
+}
+
+func (r *runeValue) Type() string {
+	return "char"
+}
+
 func New() *cobra.Command {
 	var rootCmd = &cobra.Command{
 		Use:   "yq",
-		Short: "yq is a lightweight and portable command-line YAML processor.",
-		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
+		Short: "yq is a lightweight and portable command-line data file processor.",
+		Long: `yq is a portable command-line data file processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
+		Example: `
+# yq tries to auto-detect the file format based off the extension, and defaults to YAML if it's unknown (or piping through STDIN)
+# Use the '-p/--input-format' flag to specify a format type.
+cat file.xml | yq -p xml
+
+# read the "stuff" node from "myfile.yml"
+yq '.stuff' < myfile.yml
+
+# update myfile.yml in place
+yq -i '.stuff = "foo"' myfile.yml
+
+# print contents of sample.json as idiomatic YAML
+yq -P -oy sample.json
+`,
+
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if version {
 				cmd.Print(GetVersionDisplay())
 				return nil
 			}
-			cmd.Println(cmd.UsageString())
-			return nil
+			return evaluateSequence(cmd, args)

 		},
-		PersistentPreRun: func(cmd *cobra.Command, args []string) {
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 			cmd.SetOut(cmd.OutOrStdout())
-			var format = logging.MustStringFormatter(
-				`%{color}%{time:15:04:05} %{shortfunc} [%{level:.4s}]%{color:reset} %{message}`,
-			)
+			level := logging.WARNING
+			stringFormat := `[%{level}] %{color}%{time:15:04:05}%{color:reset} %{message}`
+
+			if verbose {
+				level = logging.DEBUG
+				stringFormat = `[%{level:5.5s}] %{color}%{time:15:04:05}%{color:bold} %{shortfile:-33s} %{shortfunc:-25s}%{color:reset} %{message}`
+			}
+
+			var format = logging.MustStringFormatter(stringFormat)
 			var backend = logging.AddModuleLevel(
 				logging.NewBackendFormatter(logging.NewLogBackend(os.Stderr, "", 0), format))

-			if verbose {
-				backend.SetLevel(logging.DEBUG, "")
-			} else {
-				backend.SetLevel(logging.ERROR, "")
-			}
+			backend.SetLevel(level, "")

 			logging.SetBackend(backend)
-			yqlib.XmlPreferences.AttributePrefix = xmlAttributePrefix
-			yqlib.XmlPreferences.ContentName = xmlContentName
+			yqlib.InitExpressionParser()
+
+			return nil
 		},
 	}

@@ -51,28 +97,110 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 		panic(err)
 	}

-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p|xml|x] output format type.")
-	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|xml|x] parse format for input. Note that json is a subset of yaml.")
+	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "auto", fmt.Sprintf("[auto|a|%v] output format type.", yqlib.GetAvailableOutputFormatString()))
+	var outputCompletions = []string{"auto"}
+	for _, formats := range yqlib.GetAvailableOutputFormats() {
+		outputCompletions = append(outputCompletions, formats.FormalName)
+	}

-	rootCmd.PersistentFlags().StringVar(&xmlAttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
-	rootCmd.PersistentFlags().StringVar(&xmlContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+	if err = rootCmd.RegisterFlagCompletionFunc("output-format", cobra.FixedCompletions(outputCompletions, cobra.ShellCompDirectiveNoFileComp)); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "auto", fmt.Sprintf("[auto|a|%v] parse format for input.", yqlib.GetAvailableInputFormatString()))
+
+	var inputCompletions = []string{"auto"}
+	for _, formats := range yqlib.GetAvailableInputFormats() {
+		inputCompletions = append(inputCompletions, formats.FormalName)
+	}
+
+	if err = rootCmd.RegisterFlagCompletionFunc("input-format", cobra.FixedCompletions(inputCompletions, cobra.ShellCompDirectiveNoFileComp)); err != nil {
+		panic(err)
+	}
+
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.AttributePrefix, "xml-attribute-prefix", yqlib.ConfiguredXMLPreferences.AttributePrefix, "prefix for xml attributes")
+	if err = rootCmd.RegisterFlagCompletionFunc("xml-attribute-prefix", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ContentName, "xml-content-name", yqlib.ConfiguredXMLPreferences.ContentName, "name for xml content (if no attribute name is present).")
+	if err = rootCmd.RegisterFlagCompletionFunc("xml-content-name", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.StrictMode, "xml-strict-mode", yqlib.ConfiguredXMLPreferences.StrictMode, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.KeepNamespace, "xml-keep-namespace", yqlib.ConfiguredXMLPreferences.KeepNamespace, "enables keeping namespace after parsing attributes")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.UseRawToken, "xml-raw-token", yqlib.ConfiguredXMLPreferences.UseRawToken, "enables using RawToken method instead Token. Commonly disables namespace translations. See https://pkg.go.dev/encoding/xml#Decoder.RawToken for details.")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ProcInstPrefix, "xml-proc-inst-prefix", yqlib.ConfiguredXMLPreferences.ProcInstPrefix, "prefix for xml processing instructions (e.g. <?xml version=\"1\"?>)")
+	if err = rootCmd.RegisterFlagCompletionFunc("xml-proc-inst-prefix", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.DirectiveName, "xml-directive-name", yqlib.ConfiguredXMLPreferences.DirectiveName, "name for xml directives (e.g. <!DOCTYPE thing cat>)")
+	if err = rootCmd.RegisterFlagCompletionFunc("xml-directive-name", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipProcInst, "xml-skip-proc-inst", yqlib.ConfiguredXMLPreferences.SkipProcInst, "skip over process instructions (e.g. <?xml version=\"1\"?>)")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipDirectives, "xml-skip-directives", yqlib.ConfiguredXMLPreferences.SkipDirectives, "skip over directives (e.g. <!DOCTYPE thing cat>)")
+
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredCsvPreferences.AutoParse, "csv-auto-parse", yqlib.ConfiguredCsvPreferences.AutoParse, "parse CSV YAML/JSON values")
+	rootCmd.PersistentFlags().Var(newRuneVar(&yqlib.ConfiguredCsvPreferences.Separator), "csv-separator", "CSV Separator character")
+
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredTsvPreferences.AutoParse, "tsv-auto-parse", yqlib.ConfiguredTsvPreferences.AutoParse, "parse TSV YAML/JSON values")
+
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredLuaPreferences.DocPrefix, "lua-prefix", yqlib.ConfiguredLuaPreferences.DocPrefix, "prefix")
+	if err = rootCmd.RegisterFlagCompletionFunc("lua-prefix", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredLuaPreferences.DocSuffix, "lua-suffix", yqlib.ConfiguredLuaPreferences.DocSuffix, "suffix")
+	if err = rootCmd.RegisterFlagCompletionFunc("lua-suffix", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.UnquotedKeys, "lua-unquoted", yqlib.ConfiguredLuaPreferences.UnquotedKeys, "output unquoted string keys (e.g. {foo=\"bar\"})")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.Globals, "lua-globals", yqlib.ConfiguredLuaPreferences.Globals, "output keys as top-level global variables")
+
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredPropertiesPreferences.KeyValueSeparator, "properties-separator", yqlib.ConfiguredPropertiesPreferences.KeyValueSeparator, "separator to use between keys and values")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredPropertiesPreferences.UseArrayBrackets, "properties-array-brackets", yqlib.ConfiguredPropertiesPreferences.UseArrayBrackets, "use [x] in array paths (e.g. for SpringBoot)")
+
+	rootCmd.PersistentFlags().BoolVar(&yqlib.StringInterpolationEnabled, "string-interpolation", yqlib.StringInterpolationEnabled, "Toggles strings interpolation of \\(exp)")

 	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")

 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
+	if err = rootCmd.RegisterFlagCompletionFunc("indent", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
-	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file inplace of first file given.")
-	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file in place of first file given.")
+	rootCmd.PersistentFlags().VarP(unwrapScalarFlag, "unwrapScalar", "r", "unwrap scalar, print the value with no quotes, colors or comments. Defaults to true for yaml")
+	rootCmd.PersistentFlags().Lookup("unwrapScalar").NoOptDefVal = "true"
+	rootCmd.PersistentFlags().BoolVarP(&nulSepOutput, "nul-output", "0", false, "Use NUL char to separate values. If unwrap scalar is also set, fail if unwrapped scalar contains NUL char.")
+
 	rootCmd.PersistentFlags().BoolVarP(&prettyPrint, "prettyPrint", "P", false, "pretty print, shorthand for '... style = \"\"'")
 	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")

 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
 	rootCmd.PersistentFlags().StringVarP(&frontMatter, "front-matter", "f", "", "(extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")
+	if err = rootCmd.RegisterFlagCompletionFunc("front-matter", cobra.FixedCompletions([]string{"extract", "process"}, cobra.ShellCompDirectiveNoFileComp)); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVarP(&forceExpression, "expression", "", "", "forcibly set the expression argument. Useful when yq argument detection thinks your expression is a file.")
+	if err = rootCmd.RegisterFlagCompletionFunc("expression", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().BoolVarP(&yqlib.ConfiguredYamlPreferences.LeadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")

 	rootCmd.PersistentFlags().StringVarP(&splitFileExp, "split-exp", "s", "", "print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.")
+	if err = rootCmd.RegisterFlagCompletionFunc("split-exp", cobra.NoFileCompletions); err != nil {
+		panic(err)
+	}
+	rootCmd.PersistentFlags().StringVarP(&splitFileExpFile, "split-exp-file", "", "", "Use a file to specify the split-exp expression.")
+	if err = rootCmd.MarkPersistentFlagFilename("split-exp-file"); err != nil {
+		panic(err)
+	}
+
+	rootCmd.PersistentFlags().StringVarP(&expressionFile, "from-file", "", "", "Load expression from specified file.")
+	if err = rootCmd.MarkPersistentFlagFilename("from-file"); err != nil {
+		panic(err)
+	}

 	rootCmd.AddCommand(
 		createEvaluateSequenceCommand(),
@@ -42,12 +42,12 @@ $ yq shell-completion fish > ~/.config/fish/completions/yq.fish
 `,
 	DisableFlagsInUseLine: true,
 	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
-	Args:                  cobra.ExactValidArgs(1),
+	Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		var err error = nil
 		switch args[0] {
 		case "bash":
-			err = cmd.Root().GenBashCompletion(os.Stdout)
+			err = cmd.Root().GenBashCompletionV2(os.Stdout, true)
 		case "zsh":
 			err = cmd.Root().GenZshCompletion(os.Stdout)
 		case "fish":
@@ -0,0 +1,46 @@
+package cmd
+
+import (
+	"strconv"
+
+	"github.com/spf13/pflag"
+)
+
+type boolFlag interface {
+	pflag.Value
+	IsExplicitlySet() bool
+	IsSet() bool
+}
+
+type unwrapScalarFlagStrc struct {
+	explicitlySet bool
+	value         bool
+}
+
+func newUnwrapFlag() boolFlag {
+	return &unwrapScalarFlagStrc{value: true}
+}
+
+func (f *unwrapScalarFlagStrc) IsExplicitlySet() bool {
+	return f.explicitlySet
+}
+
+func (f *unwrapScalarFlagStrc) IsSet() bool {
+	return f.value
+}
+
+func (f *unwrapScalarFlagStrc) String() string {
+	return strconv.FormatBool(f.value)
+}
+
+func (f *unwrapScalarFlagStrc) Set(value string) error {
+
+	v, err := strconv.ParseBool(value)
+	f.value = v
+	f.explicitlySet = true
+	return err
+}
+
+func (*unwrapScalarFlagStrc) Type() string {
+	return "bool"
+}
@@ -4,12 +4,18 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
+	"gopkg.in/op/go-logging.v1"
 )

-func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
+func isAutomaticOutputFormat() bool {
+	return outputFormat == "" || outputFormat == "auto" || outputFormat == "a"
+}
+
+func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	cmd.SilenceUsage = true

 	fileInfo, _ := os.Stdout.Stat()
@@ -18,11 +24,17 @@ func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err err
 		colorsEnabled = true
 	}

-	firstFileIndex = -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
+	expression, args, err := processArgs(args)
+	if err != nil {
+		return "", nil, err
+	}
+
+	if splitFileExpFile != "" {
+		splitExpressionBytes, err := os.ReadFile(splitFileExpFile)
+		if err != nil {
+			return "", nil, err
+		}
+		splitFileExp = string(splitExpressionBytes)
 	}

 	// backwards compatibility
@@ -30,64 +42,202 @@ func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err err
 		outputFormat = "json"
 	}

-	if writeInplace && (firstFileIndex == -1) {
-		return 0, fmt.Errorf("write inplace flag only applicable when giving an expression and at least one file")
+	if writeInplace && (len(args) == 0 || args[0] == "-") {
+		return "", nil, fmt.Errorf("write in place flag only applicable when giving an expression and at least one file")
+	}
+
+	if frontMatter != "" && len(args) == 0 {
+		return "", nil, fmt.Errorf("front matter flag only applicable when giving an expression and at least one file")
 	}

 	if writeInplace && splitFileExp != "" {
-		return 0, fmt.Errorf("write inplace cannot be used with split file")
+		return "", nil, fmt.Errorf("write in place cannot be used with split file")
 	}

-	if nullInput && len(args) > 1 {
-		return 0, fmt.Errorf("cannot pass files in when using null-input flag")
+	if nullInput && len(args) > 0 {
+		return "", nil, fmt.Errorf("cannot pass files in when using null-input flag")
 	}

-	return firstFileIndex, nil
+	inputFilename := ""
+	if len(args) > 0 {
+		inputFilename = args[0]
+	}
+	if inputFormat == "" || inputFormat == "auto" || inputFormat == "a" {
+
+		inputFormat = yqlib.FormatStringFromFilename(inputFilename)
+
+		_, err := yqlib.FormatFromString(inputFormat)
+		if err != nil {
+			// unknown file type, default to yaml
+			yqlib.GetLogger().Debug("Unknown file format extension '%v', defaulting to yaml", inputFormat)
+			inputFormat = "yaml"
+			if isAutomaticOutputFormat() {
+				outputFormat = "yaml"
+			}
+		} else if isAutomaticOutputFormat() {
+			outputFormat = inputFormat
+		}
+	} else if isAutomaticOutputFormat() {
+		// backwards compatibility -
+		// before this was introduced, `yq -pcsv things.csv`
+		// would produce *yaml* output.
+		//
+		outputFormat = yqlib.FormatStringFromFilename(inputFilename)
+		if inputFilename != "-" {
+			yqlib.GetLogger().Warning("yq default output is now 'auto' (based on the filename extension). Normally yq would output '%v', but for backwards compatibility 'yaml' has been set. Please use -oy to specify yaml, or drop the -p flag.", outputFormat)
+		}
+		outputFormat = "yaml"
+	}
+
+	outputFormatType, err := yqlib.FormatFromString(outputFormat)
+
+	if err != nil {
+		return "", nil, err
+	}
+	yqlib.GetLogger().Debug("Using input format %v", inputFormat)
+	yqlib.GetLogger().Debug("Using output format %v", outputFormat)
+
+	if outputFormatType == yqlib.YamlFormat ||
+		outputFormatType == yqlib.PropertiesFormat {
+		unwrapScalar = true
+	}
+	if unwrapScalarFlag.IsExplicitlySet() {
+		unwrapScalar = unwrapScalarFlag.IsSet()
+	}
+
+	return expression, args, nil
 }

-func configureDecoder() (yqlib.Decoder, error) {
-	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
+func configureDecoder(evaluateTogether bool) (yqlib.Decoder, error) {
+	format, err := yqlib.FormatFromString(inputFormat)
 	if err != nil {
 		return nil, err
 	}
-	switch yqlibInputFormat {
-	case yqlib.XmlInputFormat:
-		return yqlib.NewXmlDecoder(xmlAttributePrefix, xmlContentName), nil
+	yqlib.ConfiguredYamlPreferences.EvaluateTogether = evaluateTogether
+
+	yqlibDecoder := format.DecoderFactory()
+	if yqlibDecoder == nil {
+		return nil, fmt.Errorf("no support for %s input format", inputFormat)
 	}
-	return yqlib.NewYamlDecoder(), nil
+	return yqlibDecoder, nil
 }

-func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) yqlib.PrinterWriter {
+func configurePrinterWriter(format *yqlib.Format, out io.Writer) (yqlib.PrinterWriter, error) {

 	var printerWriter yqlib.PrinterWriter

 	if splitFileExp != "" {
 		colorsEnabled = forceColor
-		splitExp, err := yqlib.NewExpressionParser().ParseExpression(splitFileExp)
+		splitExp, err := yqlib.ExpressionParser.ParseExpression(splitFileExp)
 		if err != nil {
-			return nil
+			return nil, fmt.Errorf("bad split document expression: %w", err)
 		}
 		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
 	} else {
 		printerWriter = yqlib.NewSinglePrinterWriter(out)
 	}
-	return printerWriter
+	return printerWriter, nil
 }

-func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
-	switch format {
-	case yqlib.JsonOutputFormat:
-		return yqlib.NewJsonEncoder(indent)
-	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder()
-	case yqlib.CsvOutputFormat:
-		return yqlib.NewCsvEncoder(',')
-	case yqlib.TsvOutputFormat:
-		return yqlib.NewCsvEncoder('\t')
-	case yqlib.YamlOutputFormat:
-		return yqlib.NewYamlEncoder(indent, colorsEnabled, !noDocSeparators, unwrapScalar)
-	case yqlib.XmlOutputFormat:
-		return yqlib.NewXmlEncoder(indent, xmlAttributePrefix, xmlContentName)
+func configureEncoder() (yqlib.Encoder, error) {
+	yqlibOutputFormat, err := yqlib.FormatFromString(outputFormat)
+	if err != nil {
+		return nil, err
 	}
-	panic("invalid encoder")
+	yqlib.ConfiguredXMLPreferences.Indent = indent
+	yqlib.ConfiguredYamlPreferences.Indent = indent
+	yqlib.ConfiguredJSONPreferences.Indent = indent
+
+	yqlib.ConfiguredYamlPreferences.UnwrapScalar = unwrapScalar
+	yqlib.ConfiguredPropertiesPreferences.UnwrapScalar = unwrapScalar
+	yqlib.ConfiguredJSONPreferences.UnwrapScalar = unwrapScalar
+
+	yqlib.ConfiguredYamlPreferences.ColorsEnabled = colorsEnabled
+	yqlib.ConfiguredJSONPreferences.ColorsEnabled = colorsEnabled
+
+	yqlib.ConfiguredYamlPreferences.PrintDocSeparators = !noDocSeparators
+
+	encoder := yqlibOutputFormat.EncoderFactory()
+
+	if encoder == nil {
+		return nil, fmt.Errorf("no support for %s output format", outputFormat)
+	}
+	return encoder, err
+}
+
+// this is a hack to enable backwards compatibility with githubactions (which pipe /dev/null into everything)
+// and being able to call yq with the filename as a single parameter
+//
+// without this - yq detects there is stdin (thanks githubactions),
+// then tries to parse the filename as an expression
+func maybeFile(str string) bool {
+	yqlib.GetLogger().Debugf("checking '%v' is a file", str)
+	stat, err := os.Stat(str) // #nosec
+	result := err == nil && !stat.IsDir()
+	if yqlib.GetLogger().IsEnabledFor(logging.DEBUG) {
+		if err != nil {
+			yqlib.GetLogger().Debugf("error: %v", err)
+		} else {
+			yqlib.GetLogger().Debugf("error: %v, dir: %v", err, stat.IsDir())
+		}
+		yqlib.GetLogger().Debugf("result: %v", result)
+	}
+	return result
+}
+
+func processStdInArgs(args []string) []string {
+	stat, err := os.Stdin.Stat()
+	if err != nil {
+		yqlib.GetLogger().Debugf("error getting stdin: %v", err)
+	}
+	pipingStdin := stat != nil && (stat.Mode()&os.ModeCharDevice) == 0
+
+	// if we've been given a file, don't automatically
+	// read from stdin.
+	// this happens if there is more than one argument
+	// or only one argument and its a file
+	if nullInput || !pipingStdin || len(args) > 1 || (len(args) > 0 && maybeFile(args[0])) {
+		return args
+	}
+
+	for _, arg := range args {
+		if arg == "-" {
+			return args
+		}
+	}
+	yqlib.GetLogger().Debugf("missing '-', adding it to the end")
+
+	// we're piping from stdin, but there's no '-' arg
+	// lets add one to the end
+	return append(args, "-")
+}
+
+func processArgs(originalArgs []string) (string, []string, error) {
+	expression := forceExpression
+	args := processStdInArgs(originalArgs)
+	maybeFirstArgIsAFile := len(args) > 0 && maybeFile(args[0])
+
+	if expressionFile == "" && maybeFirstArgIsAFile && strings.HasSuffix(args[0], ".yq") {
+		// lets check if an expression file was given
+		yqlib.GetLogger().Debug("Assuming arg %v is an expression file", args[0])
+		expressionFile = args[0]
+		args = args[1:]
+	}
+
+	if expressionFile != "" {
+		expressionBytes, err := os.ReadFile(expressionFile)
+		if err != nil {
+			return "", nil, err
+		}
+		//replace \r\n (windows) with good ol' unix file endings.
+		expression = strings.ReplaceAll(string(expressionBytes), "\r\n", "\n")
+	}
+
+	yqlib.GetLogger().Debugf("processed args: %v", args)
+	if expression == "" && len(args) > 0 && args[0] != "-" && !maybeFile(args[0]) {
+		yqlib.GetLogger().Debug("assuming expression is '%v'", args[0])
+		expression = args[0]
+		args = args[1:]
+	}
+	return expression, args, nil
 }
@@ -11,7 +11,7 @@ var (
 	GitDescribe string

 	// Version is main version number that is being run at the moment.
-	Version = "4.16.2"
+	Version = "v4.43.1"

 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release
@@ -0,0 +1,14 @@
+---
+$schema: https://raw.githubusercontent.com/streetsidesoftware/cspell/main/cspell.schema.json
+version: '0.2'
+language: en-GB
+dictionaryDefinitions:
+  - name: project-words
+    path: './project-words.txt'
+    addWords: true
+dictionaries:
+  - project-words
+ignorePaths:
+  - 'vendor'
+  - 'bin'
+  - '/project-words.txt'
@@ -103,7 +103,7 @@ yq (4.16.2) focal; urgency=medium
  * Improved extract-checksum.sh
  * Bump github.com/spf13/cobra from 1.2.1 to 1.3.0 (#1039)
  * enable more linters (#1043)
-  * Bump golang compiler #1037
+  * Bump Golang compiler #1037

 -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 21 Dec 2021 09:41:44 +0000

@@ -127,7 +127,7 @@ yq (4.9.6) focal; urgency=medium

  * Added darwin/arm64 build, thanks @alecthomas
  * Incremented docker alpine base version, thanks @da6d6i7-bronga
-  * Bug fix: multine expression
+  * Bug fix: multiline expression
  * Bug fix: special character

 -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 29 Jun 2021 21:32:14 +0200
@@ -135,7 +135,7 @@ yq (4.9.6) focal; urgency=medium
 yq (3.3.2) focal; urgency=medium

  * Bug fix: existStatus bug (#459)
-  * Automatically makes a os temp directory if it does not exist (#461)
+  * Automatically makes an os temp directory if it does not exist (#461)

 -- Roberto Mier Escandon <rmescandon@gmail.com>  Fri, 07 Aug 2020 18:53:01 +0200

@@ -16,7 +16,7 @@ XSBC-Original-Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Package: yq
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Description: lightweight and portable command-line YAML processor
+Description: lightweight and portable command-line data file processor
 .
 The aim of the project is to be the 
 [jq](https://github.com/stedolan/jq) or sed of yaml files.
@@ -1,11 +1,2 @@
---
- become: true
-  gather_facts: false
-  hosts: lalaland
-  name: "Apply smth"
-  roles:
-    - lala
-    - land
-  serial: 1
- become: false
-  gather_facts: true
+- [cat, dog, frog, cow]
+- [apple, banana, grape, mango]
@@ -0,0 +1 @@
+bXkgc2VjcmV0IGNoaWxsaSByZWNpcGUgaXMuLi4u
@@ -0,0 +1,9 @@
+return {
+	["country"] = "Australia"; -- this place
+	["cities"] = {
+		"Sydney",
+		"Melbourne",
+		"Brisbane",
+		"Perth",
+	};
+};
@@ -1 +1,11 @@
-cat: purrs
+# block comments come through
+person: # neither do comments on maps
+    name: Mike Wazowski # comments on values appear
+    pets: 
+    - cat # comments on array values appear
+    - dog # comments on array values appear
+    - things:
+        - frog
+    food: [pizza] # comments on arrays do not
+emptyArray: []
+emptyMap: []
@@ -1,2 +1,5 @@
-c:
-  d: hamster
+# --------------------------------------------------
+# It's a test with comment
+# --------------------------------------------------
+groups:
+  - name: d
@@ -0,0 +1,5 @@
+#! yq
+.[] |(
+    ( select(kind == "scalar") | key + "='" + . + "'"),
+    ( select(kind == "seq") | key + "=(" + (map("'" + . + "'") | join(",")) + ")")
+)
@@ -0,0 +1,6 @@
+# comments on values appear
+person.name = Mike
+
+# comments on array values appear
+person.pets.0 = cat
+person.food.0 = pizza
@@ -1,14 +1 @@
-<!-- before cat -->
-<cat>
-	<!-- in cat before -->
-	<x>3<!-- multi
-line comment
-for x --></x>
-	<y>
-		<!-- in y before -->
-		<d><!-- in d before -->4<!-- in d after --></d>
-		<!-- in y after -->
-	</y>
-	<!-- in_cat_after -->
-</cat>
-<!-- after cat -->
+<zoo><thing><frog>boing</frog></thing></zoo>
@@ -0,0 +1,26 @@
+
+
+# This is a TOML document
+
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00
+
+[database]
+enabled = true
+ports = [ 8000, 8001, 8002 ]
+data = [ ["delta", "phi"], [3.14] ]
+temp_targets = { cpu = 79.5, case = 72.0 }
+
+[servers]
+
+[servers.alpha]
+ip = "10.0.0.1"
+role = "frontend"
+
+[servers.beta]
+ip = "10.0.0.2"
+role = "backend"
+
@@ -1,11 +1,2 @@
-# Some doc
-
-a: true
-b:
-  c: 2
-  d: [3, 4, 5]
-  e:
-    - name: fred
-      value: 3
-    - name: sam
-      value: 4
+ # things
+a: apple
@@ -0,0 +1,3 @@
+name,numberOfCats,likesApples,height
+,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
@@ -0,0 +1 @@
+this.is = a properties file
@@ -0,0 +1 @@
+<this>is some xml</this>
@@ -0,0 +1,4 @@
+---
+# comment
+# about things
+a: cat
@@ -2,7 +2,8 @@ FROM mikefarah/yq:4

 COPY entrypoint.sh /entrypoint.sh

-# this seems to be the default user in github actions
-USER 1001
+# github action recommendation is to run as root.
+# https://docs.github.com/en/actions/creating-actions/dockerfile-support-for-github-actions#user
+USER root

 ENTRYPOINT ["/entrypoint.sh"]
@@ -2,8 +2,11 @@
 set -e
 echo "::debug::\$cmd: $1"
 RESULT=$(eval "$1")
-RESULT="${RESULT//'%'/'%25'}"
-RESULT="${RESULT//$'\n'/'%0A'}"
-RESULT="${RESULT//$'\r'/'%0D'}"
 echo "::debug::\$RESULT: $RESULT"
-echo ::set-output name=result::"$RESULT"
+# updating from 
+# https://github.com/orgs/community/discussions/26288#discussioncomment-3876281
+# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
+delimiter=$(cat /proc/sys/kernel/random/uuid)
+echo "result<<${delimiter}" >> "${GITHUB_OUTPUT}"
+echo "${RESULT}" >> "${GITHUB_OUTPUT}"
+echo "${delimiter}" >> "${GITHUB_OUTPUT}"
@@ -1,28 +1,33 @@
 module github.com/mikefarah/yq/v4

 require (
-	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.13.0
-	github.com/goccy/go-yaml v1.9.5
-	github.com/jinzhu/copier v0.3.4
-	github.com/magiconair/properties v1.8.5
+	github.com/a8m/envsubst v1.4.2
+	github.com/alecthomas/participle/v2 v2.1.1
+	github.com/alecthomas/repr v0.4.0
+	github.com/dimchansky/utfbom v1.1.1
+	github.com/elliotchance/orderedmap v1.5.1
+	github.com/fatih/color v1.16.0
+	github.com/goccy/go-json v0.10.2
+	github.com/goccy/go-yaml v1.11.3
+	github.com/jinzhu/copier v0.4.0
+	github.com/magiconair/properties v1.8.7
+	github.com/pelletier/go-toml/v2 v2.2.0
 	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
-	github.com/spf13/cobra v1.3.0
-	github.com/timtadh/lexmachine v0.2.2
-	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
+	github.com/spf13/cobra v1.8.0
+	github.com/spf13/pflag v1.0.5
+	github.com/yuin/gopher-lua v1.1.1
+	golang.org/x/net v0.22.0
+	golang.org/x/text v0.14.0
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+	gopkg.in/yaml.v3 v3.0.1
 )

 require (
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/mattn/go-colorable v0.1.12 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/timtadh/data-structures v0.5.3 // indirect
-	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
-	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 )

-go 1.17
+go 1.21
@@ -1,794 +1,87 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
-cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
-cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
-cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
-cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
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-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
@@ -19,7 +19,7 @@ with an expression:
 .a = .b
 ```

-Like math expression - operator precedence is important. 
+Like math expressions - operator precedence is important. 

 The `=` operator takes two arguments, a `lhs` expression, which in this case is `.a` and `rhs` expression which is `.b`. 

@@ -29,7 +29,7 @@ It pipes the current, lets call it 'root' context through the `lhs` expression o
 cat
 ```

-Sidenote: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
+Side note: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.

 The `=` operator then pipes the 'root' context through the `rhs` expression of `.b` to return the node

@@ -37,7 +37,7 @@ The `=` operator then pipes the 'root' context through the `rhs` expression of `
 dog
 ```

-Both sides have now been evaluated, so now the operator copies across the value from the RHS (`.b`) to the the LHS (`.a`), and it returns the now updated context:
+Both sides have now been evaluated, so now the operator copies across the value from the RHS (`.b`) to the LHS (`.a`), and it returns the now updated context:

 ```yaml
 a: dog
@@ -47,7 +47,7 @@ b: dog

 ## Complex assignment, operator precedence rules

-Just like math expression - `yq` expression have an order of precedence. The pipe `|` operator has a low order of precedence, so operators with higher precedence will get evalated first. 
+Just like math expressions - `yq` expressions have an order of precedence. The pipe `|` operator has a low order of precedence, so operators with higher precedence will get evaluated first. 

 Most of the time, this is intuitively what you'd want, for instance `.a = "cat" | .b = "dog"` is effectively: `(.a = "cat") | (.b = "dog")`.

@@ -66,7 +66,7 @@ Lets say you had:
 Lets say you wanted to update the `sally` entry to have fruit: 'mango'. The _incorrect_ way to do that is:
 `.[] | select(.name == "sally") | .fruit = "mango"`.

-Becasue `|` has a low operator precedence, this will be evaluated (_incorrectly_) as : `(.[]) | (select(.name == "sally")) | (.fruit = "mango")`. What you'll see is only the updated segment returned:
+Because `|` has a low operator precedence, this will be evaluated (_incorrectly_) as : `(.[]) | (select(.name == "sally")) | (.fruit = "mango")`. What you'll see is only the updated segment returned:

 ```yaml
 name: sally
@@ -1,8 +0,0 @@
-#!/bin/bash
-# ./yq ea '.[]'  examples/data*.yaml
-
-
-./yq ea '
-  ((.[] | {.name: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
-  | ( $uniqueMap  | to_entries | .[]) as $item ireduce([]; . + $item.value)
-' examples/data*.yaml
@@ -2,16 +2,14 @@ package yqlib

 import (
 	"container/list"
-
-	yaml "gopkg.in/yaml.v3"
 )

 // A yaml expression evaluator that runs the expression once against all files/nodes in memory.
 type Evaluator interface {
-	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error
+	EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error

 	// EvaluateNodes takes an expression and one or more yaml nodes, returning a list of matching candidate nodes
-	EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error)
+	EvaluateNodes(expression string, nodes ...*CandidateNode) (*list.List, error)

 	// EvaluateCandidateNodes takes an expression and list of candidate nodes, returning a list of matching candidate nodes
 	EvaluateCandidateNodes(expression string, inputCandidateNodes *list.List) (*list.List, error)
@@ -19,23 +17,23 @@ type Evaluator interface {

 type allAtOnceEvaluator struct {
 	treeNavigator DataTreeNavigator
-	treeCreator   ExpressionParser
 }

 func NewAllAtOnceEvaluator() Evaluator {
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
+	InitExpressionParser()
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
 }

-func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error) {
+func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*CandidateNode) (*list.List, error) {
 	inputCandidates := list.New()
 	for _, node := range nodes {
-		inputCandidates.PushBack(&CandidateNode{Node: node})
+		inputCandidates.PushBack(node)
 	}
 	return e.EvaluateCandidateNodes(expression, inputCandidates)
 }

 func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
-	node, err := e.treeCreator.ParseExpression(expression)
+	node, err := ExpressionParser.ParseExpression(expression)
 	if err != nil {
 		return nil, err
 	}
@@ -46,21 +44,16 @@ func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCand
 	return context.MatchingNodes, nil
 }

-func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error {
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error {
 	fileIndex := 0
-	firstFileLeadingContent := ""

 	var allDocuments = list.New()
 	for _, filename := range filenames {
-		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
+		reader, err := readStream(filename)
 		if err != nil {
 			return err
 		}

-		if fileIndex == 0 {
-			firstFileLeadingContent = leadingContent
-		}
-
 		fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
 		if err != nil {
 			return err
@@ -70,16 +63,8 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 	}

 	if allDocuments.Len() == 0 {
-		candidateNode := &CandidateNode{
-			Document:       0,
-			Filename:       "",
-			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
-			FileIndex:      0,
-			LeadingContent: firstFileLeadingContent,
-		}
+		candidateNode := createScalarNode(nil, "")
 		allDocuments.PushBack(candidateNode)
-	} else {
-		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
 	}

 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
@@ -1,6 +1,8 @@
 package yqlib

 import (
+	"bufio"
+	"strings"
 	"testing"

 	"github.com/mikefarah/yq/v4/test"
@@ -18,7 +20,7 @@ var evaluateNodesScenario = []expressionScenario{
 		document:   `a: hello`,
 		expression: `.`,
 		expected: []string{
-			"D0, P[], (doc)::a: hello\n",
+			"D0, P[], (!!map)::a: hello\n",
 		},
 	},
 	{
@@ -32,9 +34,23 @@ var evaluateNodesScenario = []expressionScenario{

 func TestAllAtOnceEvaluateNodes(t *testing.T) {
 	var evaluator = NewAllAtOnceEvaluator()
+	// logging.SetLevel(logging.DEBUG, "")
 	for _, tt := range evaluateNodesScenario {
-		node := test.ParseData(tt.document)
-		list, _ := evaluator.EvaluateNodes(tt.expression, &node)
+		decoder := NewYamlDecoder(ConfiguredYamlPreferences)
+		reader := bufio.NewReader(strings.NewReader(tt.document))
+		err := decoder.Init(reader)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		candidateNode, errorReading := decoder.Decode()
+
+		if errorReading != nil {
+			t.Error(errorReading)
+			return
+		}
+
+		list, _ := evaluator.EvaluateNodes(tt.expression, candidateNode)
 		test.AssertResultComplex(t, tt.expected, resultsToString(t, list))
 	}
 }
@@ -3,50 +3,189 @@ package yqlib
 import (
 	"container/list"
 	"fmt"
+	"strconv"
 	"strings"
-
-	"github.com/jinzhu/copier"
-	yaml "gopkg.in/yaml.v3"
 )

+type Kind uint32
+
+const (
+	SequenceNode Kind = 1 << iota
+	MappingNode
+	ScalarNode
+	AliasNode
+)
+
+type Style uint32
+
+const (
+	TaggedStyle Style = 1 << iota
+	DoubleQuotedStyle
+	SingleQuotedStyle
+	LiteralStyle
+	FoldedStyle
+	FlowStyle
+)
+
+func createStringScalarNode(stringValue string) *CandidateNode {
+	var node = &CandidateNode{Kind: ScalarNode}
+	node.Value = stringValue
+	node.Tag = "!!str"
+	return node
+}
+
+func createScalarNode(value interface{}, stringValue string) *CandidateNode {
+	var node = &CandidateNode{Kind: ScalarNode}
+	node.Value = stringValue
+
+	switch value.(type) {
+	case float32, float64:
+		node.Tag = "!!float"
+	case int, int64, int32:
+		node.Tag = "!!int"
+	case bool:
+		node.Tag = "!!bool"
+	case string:
+		node.Tag = "!!str"
+	case nil:
+		node.Tag = "!!null"
+	}
+	return node
+}
+
 type CandidateNode struct {
-	Node   *yaml.Node     // the actual node
+	Kind  Kind
+	Style Style
+
+	Tag     string
+	Value   string
+	Anchor  string
+	Alias   *CandidateNode
+	Content []*CandidateNode
+
+	HeadComment string
+	LineComment string
+	FootComment string
+
 	Parent *CandidateNode // parent node
-	Key    *yaml.Node     // node key, if this is a value from a map (or index in an array)
+	Key    *CandidateNode // node key, if this is a value from a map (or index in an array)

 	LeadingContent string

-	Path      []interface{} /// the path we took to get to this node
-	Document  uint          // the document index of this node
-	Filename  string
-	FileIndex int
+	document uint // the document index of this node
+	filename string
+
+	Line   int
+	Column int
+
+	fileIndex int
 	// when performing op against all nodes given, this will treat all the nodes as one
-	// (e.g. top level cross document merge). This property does not propegate to child nodes.
+	// (e.g. top level cross document merge). This property does not propagate to child nodes.
 	EvaluateTogether bool
 	IsMapKey         bool
 }

+func (n *CandidateNode) CreateChild() *CandidateNode {
+	return &CandidateNode{
+		Parent: n,
+	}
+}
+
+func (n *CandidateNode) SetDocument(idx uint) {
+	n.document = idx
+}
+
+func (n *CandidateNode) GetDocument() uint {
+	// defer to parent
+	if n.Parent != nil {
+		return n.Parent.GetDocument()
+	}
+	return n.document
+}
+
+func (n *CandidateNode) SetFilename(name string) {
+	n.filename = name
+}
+
+func (n *CandidateNode) GetFilename() string {
+	if n.Parent != nil {
+		return n.Parent.GetFilename()
+	}
+	return n.filename
+}
+
+func (n *CandidateNode) SetFileIndex(idx int) {
+	n.fileIndex = idx
+}
+
+func (n *CandidateNode) GetFileIndex() int {
+	if n.Parent != nil {
+		return n.Parent.GetFileIndex()
+	}
+	return n.fileIndex
+}
+
 func (n *CandidateNode) GetKey() string {
 	keyPrefix := ""
 	if n.IsMapKey {
-		keyPrefix = "key-"
+		keyPrefix = fmt.Sprintf("key-%v-", n.Value)
 	}
-	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
+	key := ""
+	if n.Key != nil {
+		key = n.Key.Value
+	}
+	return fmt.Sprintf("%v%v - %v", keyPrefix, n.GetDocument(), key)
 }

-func (n *CandidateNode) GetNiceTag() string {
-	return unwrapDoc(n.Node).Tag
+func (n *CandidateNode) getParsedKey() interface{} {
+	if n.IsMapKey {
+		return n.Value
+	}
+	if n.Key == nil {
+		return nil
+	}
+	if n.Key.Tag == "!!str" {
+		return n.Key.Value
+	}
+	index, err := parseInt(n.Key.Value)
+	if err != nil {
+		return n.Key.Value
+	}
+	return index
+
+}
+
+func (n *CandidateNode) GetPath() []interface{} {
+	key := n.getParsedKey()
+	if n.Parent != nil && key != nil {
+		return append(n.Parent.GetPath(), key)
+	}
+
+	if key != nil {
+		return []interface{}{key}
+	}
+	return make([]interface{}, 0)
 }

 func (n *CandidateNode) GetNicePath() string {
-	if n.Path != nil && len(n.Path) >= 0 {
-		pathStr := make([]string, len(n.Path))
-		for i, v := range n.Path {
-			pathStr[i] = fmt.Sprintf("%v", v)
+	var sb strings.Builder
+	path := n.GetPath()
+	for i, element := range path {
+		elementStr := fmt.Sprintf("%v", element)
+		switch element.(type) {
+		case int:
+			sb.WriteString("[" + elementStr + "]")
+		default:
+			if i == 0 {
+				sb.WriteString(elementStr)
+			} else if strings.ContainsRune(elementStr, '.') {
+				sb.WriteString("[" + elementStr + "]")
+			} else {
+				sb.WriteString("." + elementStr)
+			}
 		}
-		return strings.Join(pathStr, ".")
 	}
-	return ""
+	return sb.String()
 }

 func (n *CandidateNode) AsList() *list.List {
@@ -55,107 +194,237 @@ func (n *CandidateNode) AsList() *list.List {
 	return elMap
 }

-func (n *CandidateNode) CreateChildInMap(key *yaml.Node, node *yaml.Node) *CandidateNode {
-	var value interface{}
-	if key != nil {
-		value = key.Value
+func (n *CandidateNode) SetParent(parent *CandidateNode) {
+	n.Parent = parent
+}
+
+func (n *CandidateNode) AddKeyValueChild(rawKey *CandidateNode, rawValue *CandidateNode) (*CandidateNode, *CandidateNode) {
+	key := rawKey.Copy()
+	key.SetParent(n)
+	key.IsMapKey = true
+
+	value := rawValue.Copy()
+	value.SetParent(n)
+	value.IsMapKey = false // force this, incase we are creating a value from a key
+	value.Key = key
+
+	n.Content = append(n.Content, key, value)
+	return key, value
+}
+
+func (n *CandidateNode) AddChild(rawChild *CandidateNode) {
+	value := rawChild.Copy()
+	value.SetParent(n)
+	if value.Key != nil {
+		value.Key.SetParent(n)
+	} else {
+		index := len(n.Content)
+		keyNode := createScalarNode(index, fmt.Sprintf("%v", index))
+		keyNode.SetParent(n)
+		value.Key = keyNode
 	}
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(value),
-		Parent:    n,
-		Key:       key,
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
+	n.Content = append(n.Content, value)
+}
+
+func (n *CandidateNode) AddChildren(children []*CandidateNode) {
+	if n.Kind == MappingNode {
+		for i := 0; i < len(children); i += 2 {
+			key := children[i]
+			value := children[i+1]
+			n.AddKeyValueChild(key, value)
+		}
+
+	} else {
+		for _, rawChild := range children {
+			n.AddChild(rawChild)
+		}
 	}
 }

-func (n *CandidateNode) CreateChildInArray(index int, node *yaml.Node) *CandidateNode {
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(index),
-		Parent:    n,
-		Key:       &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", index), Tag: "!!int"},
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
+func (n *CandidateNode) GetValueRep() (interface{}, error) {
+	log.Debugf("GetValueRep for %v value: %v", n.GetNicePath(), n.Value)
+	realTag := n.guessTagFromCustomType()
+
+	switch realTag {
+	case "!!int":
+		_, val, err := parseInt64(n.Value)
+		return val, err
+	case "!!float":
+		// need to test this
+		return strconv.ParseFloat(n.Value, 64)
+	case "!!bool":
+		return isTruthyNode(n), nil
+	case "!!null":
+		return nil, nil
 	}
+
+	return n.Value, nil
 }

-func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(nil),
-		Parent:    n.Parent,
-		Key:       n.Key,
-		IsMapKey:  n.IsMapKey,
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
+func (n *CandidateNode) guessTagFromCustomType() string {
+	if strings.HasPrefix(n.Tag, "!!") {
+		return n.Tag
+	} else if n.Value == "" {
+		log.Debug("guessTagFromCustomType: node has no value to guess the type with")
+		return n.Tag
 	}
+	dataBucket, errorReading := parseSnippet(n.Value)
+
+	if errorReading != nil {
+		log.Debug("guessTagFromCustomType: could not guess underlying tag type %v", errorReading)
+		return n.Tag
+	}
+	guessedTag := dataBucket.Tag
+	log.Info("im guessing the tag %v is a %v", n.Tag, guessedTag)
+	return guessedTag
 }

-func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
-	if path == nil {
-		newPath := make([]interface{}, len(n.Path))
-		copy(newPath, n.Path)
-		return newPath
+func (n *CandidateNode) CreateReplacement(kind Kind, tag string, value string) *CandidateNode {
+	node := &CandidateNode{
+		Kind:  kind,
+		Tag:   tag,
+		Value: value,
 	}
-
-	//don't use append as they may actually modify the path of the orignal node!
-	newPath := make([]interface{}, len(n.Path)+1)
-	copy(newPath, n.Path)
-	newPath[len(n.Path)] = path
-	return newPath
+	return n.CopyAsReplacement(node)
 }

-func (n *CandidateNode) Copy() (*CandidateNode, error) {
-	clone := &CandidateNode{}
-	err := copier.Copy(clone, n)
-	if err != nil {
-		return nil, err
+func (n *CandidateNode) CopyAsReplacement(replacement *CandidateNode) *CandidateNode {
+	newCopy := replacement.Copy()
+	newCopy.Parent = n.Parent
+
+	if n.IsMapKey {
+		newCopy.Key = n
+	} else {
+		newCopy.Key = n.Key
 	}
-	return clone, nil
+
+	return newCopy
+}
+
+func (n *CandidateNode) CreateReplacementWithComments(kind Kind, tag string, style Style) *CandidateNode {
+	replacement := n.CreateReplacement(kind, tag, "")
+	replacement.LeadingContent = n.LeadingContent
+	replacement.HeadComment = n.HeadComment
+	replacement.LineComment = n.LineComment
+	replacement.FootComment = n.FootComment
+	replacement.Style = style
+	return replacement
+}
+
+func (n *CandidateNode) Copy() *CandidateNode {
+	return n.doCopy(true)
+}
+
+func (n *CandidateNode) CopyWithoutContent() *CandidateNode {
+	return n.doCopy(false)
+}
+
+func (n *CandidateNode) doCopy(cloneContent bool) *CandidateNode {
+	var content []*CandidateNode
+
+	var copyKey *CandidateNode
+	if n.Key != nil {
+		copyKey = n.Key.Copy()
+	}
+
+	clone := &CandidateNode{
+		Kind:  n.Kind,
+		Style: n.Style,
+
+		Tag:    n.Tag,
+		Value:  n.Value,
+		Anchor: n.Anchor,
+
+		// ok not to clone this,
+		// as its a reference to somewhere else.
+		Alias:   n.Alias,
+		Content: content,
+
+		HeadComment: n.HeadComment,
+		LineComment: n.LineComment,
+		FootComment: n.FootComment,
+
+		Parent: n.Parent,
+		Key:    copyKey,
+
+		LeadingContent: n.LeadingContent,
+
+		document:  n.document,
+		filename:  n.filename,
+		fileIndex: n.fileIndex,
+
+		Line:   n.Line,
+		Column: n.Column,
+
+		EvaluateTogether: n.EvaluateTogether,
+		IsMapKey:         n.IsMapKey,
+	}
+
+	if cloneContent {
+		clone.AddChildren(n.Content)
+	}
+
+	return clone
 }

 // updates this candidate from the given candidate node
 func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
+	if n == other {
+		log.Debugf("UpdateFrom, no need to update from myself.")
+		return
+	}
+	// if this is an empty map or empty array, use the style of other node.
+	if (n.Kind != ScalarNode && len(n.Content) == 0) ||
+		// if the tag has changed (e.g. from str to bool)
+		(n.guessTagFromCustomType() != other.guessTagFromCustomType()) {
+		n.Style = other.Style
+	}
+
+	n.Content = make([]*CandidateNode, 0)
+	n.Kind = other.Kind
+	n.AddChildren(other.Content)
+
+	n.Value = other.Value

 	n.UpdateAttributesFrom(other, prefs)
-	n.Node.Content = other.Node.Content
-	n.Node.Value = other.Node.Value
+
 }

 func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
-	log.Debug("UpdateAttributesFrom: n: %v other: %v", n.GetKey(), other.GetKey())
-	if n.Node.Kind != other.Node.Kind {
+	log.Debug("UpdateAttributesFrom: n: %v other: %v", NodeToString(n), NodeToString(other))
+	if n.Kind != other.Kind {
 		// clear out the contents when switching to a different type
 		// e.g. map to array
-		n.Node.Content = make([]*yaml.Node, 0)
-		n.Node.Value = ""
+		n.Content = make([]*CandidateNode, 0)
+		n.Value = ""
 	}
-	n.Node.Kind = other.Node.Kind
-	n.Node.Tag = other.Node.Tag
-	n.Node.Alias = other.Node.Alias
+	n.Kind = other.Kind
+
+	// don't clobber custom tags...
+	if prefs.ClobberCustomTags || strings.HasPrefix(n.Tag, "!!") || n.Tag == "" {
+		n.Tag = other.Tag
+	}
+
+	n.Alias = other.Alias

 	if !prefs.DontOverWriteAnchor {
-		n.Node.Anchor = other.Node.Anchor
+		n.Anchor = other.Anchor
 	}

 	// merge will pickup the style of the new thing
 	// when autocreating nodes
-	if n.Node.Style == 0 {
-		n.Node.Style = other.Node.Style
+
+	if n.Style == 0 {
+		n.Style = other.Style
 	}

-	if other.Node.FootComment != "" {
-		n.Node.FootComment = other.Node.FootComment
+	if other.FootComment != "" {
+		n.FootComment = other.FootComment
 	}
-	if other.Node.HeadComment != "" {
-		n.Node.HeadComment = other.Node.HeadComment
+	if other.HeadComment != "" {
+		n.HeadComment = other.HeadComment
 	}
-	if other.Node.LineComment != "" {
-		n.Node.LineComment = other.Node.LineComment
+	if other.LineComment != "" {
+		n.LineComment = other.LineComment
 	}
 }
@@ -0,0 +1,180 @@
+package yqlib
+
+import (
+	"fmt"
+	"strings"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/goccy/go-yaml/ast"
+	goccyToken "github.com/goccy/go-yaml/token"
+)
+
+func (o *CandidateNode) goccyDecodeIntoChild(childNode ast.Node, cm yaml.CommentMap) (*CandidateNode, error) {
+	newChild := o.CreateChild()
+
+	err := newChild.UnmarshalGoccyYAML(childNode, cm)
+	return newChild, err
+}
+
+func (o *CandidateNode) UnmarshalGoccyYAML(node ast.Node, cm yaml.CommentMap) error {
+	log.Debugf("UnmarshalYAML %v", node)
+	log.Debugf("UnmarshalYAML %v", node.Type().String())
+	log.Debugf("UnmarshalYAML Node Value: %v", node.String())
+	log.Debugf("UnmarshalYAML Node GetComment: %v", node.GetComment())
+
+	if node.GetComment() != nil {
+		commentMapComments := cm[node.GetPath()]
+		for _, comment := range node.GetComment().Comments {
+			// need to use the comment map to find the position :/
+			log.Debugf("%v has a comment of [%v]", node.GetPath(), comment.Token.Value)
+			for _, commentMapComment := range commentMapComments {
+				commentMapValue := strings.Join(commentMapComment.Texts, "\n")
+				if commentMapValue == comment.Token.Value {
+					log.Debug("found a matching entry in comment map")
+					// we found the comment in the comment map,
+					// now we can process the position
+					switch commentMapComment.Position {
+					case yaml.CommentHeadPosition:
+						o.HeadComment = comment.String()
+						log.Debug("its a head comment %v", comment.String())
+					case yaml.CommentLinePosition:
+						o.LineComment = comment.String()
+						log.Debug("its a line comment %v", comment.String())
+					case yaml.CommentFootPosition:
+						o.FootComment = comment.String()
+						log.Debug("its a foot comment %v", comment.String())
+					}
+				}
+			}
+
+		}
+	}
+
+	o.Value = node.String()
+	switch node.Type() {
+	case ast.IntegerType:
+		o.Kind = ScalarNode
+		o.Tag = "!!int"
+	case ast.FloatType:
+		o.Kind = ScalarNode
+		o.Tag = "!!float"
+	case ast.BoolType:
+		o.Kind = ScalarNode
+		o.Tag = "!!bool"
+	case ast.NullType:
+		o.Kind = ScalarNode
+		o.Tag = "!!null"
+		o.Value = node.GetToken().Value
+	case ast.StringType:
+		o.Kind = ScalarNode
+		o.Tag = "!!str"
+		switch node.GetToken().Type {
+		case goccyToken.SingleQuoteType:
+			o.Style = SingleQuotedStyle
+		case goccyToken.DoubleQuoteType:
+			o.Style = DoubleQuotedStyle
+		}
+		o.Value = node.(*ast.StringNode).Value
+		log.Debugf("string value %v", node.(*ast.StringNode).Value)
+	case ast.LiteralType:
+		o.Kind = ScalarNode
+		o.Tag = "!!str"
+		o.Style = LiteralStyle
+		astLiteral := node.(*ast.LiteralNode)
+		log.Debugf("astLiteral.Start.Type %v", astLiteral.Start.Type)
+		if astLiteral.Start.Type == goccyToken.FoldedType {
+			log.Debugf("folded Type %v", astLiteral.Start.Type)
+			o.Style = FoldedStyle
+		}
+		log.Debug("start value: %v ", node.(*ast.LiteralNode).Start.Value)
+		log.Debug("start value: %v ", node.(*ast.LiteralNode).Start.Type)
+		// TODO: here I could put the original value with line breaks
+		// to solve the multiline > problem
+		o.Value = astLiteral.Value.Value
+	case ast.TagType:
+		if err := o.UnmarshalGoccyYAML(node.(*ast.TagNode).Value, cm); err != nil {
+			return err
+		}
+		o.Tag = node.(*ast.TagNode).Start.Value
+	case ast.MappingType:
+		log.Debugf("UnmarshalYAML -  a mapping node")
+		o.Kind = MappingNode
+		o.Tag = "!!map"
+
+		mappingNode := node.(*ast.MappingNode)
+		if mappingNode.IsFlowStyle {
+			o.Style = FlowStyle
+		}
+		for _, mappingValueNode := range mappingNode.Values {
+			err := o.goccyProcessMappingValueNode(mappingValueNode, cm)
+			if err != nil {
+				return ast.ErrInvalidAnchorName
+			}
+		}
+		if mappingNode.FootComment != nil {
+			log.Debugf("mapping node has a foot comment of: %v", mappingNode.FootComment)
+			o.FootComment = mappingNode.FootComment.String()
+		}
+	case ast.MappingValueType:
+		log.Debugf("UnmarshalYAML -  a mapping node")
+		o.Kind = MappingNode
+		o.Tag = "!!map"
+		mappingValueNode := node.(*ast.MappingValueNode)
+		err := o.goccyProcessMappingValueNode(mappingValueNode, cm)
+		if err != nil {
+			return ast.ErrInvalidAnchorName
+		}
+	case ast.SequenceType:
+		log.Debugf("UnmarshalYAML -  a sequence node")
+		o.Kind = SequenceNode
+		o.Tag = "!!seq"
+		sequenceNode := node.(*ast.SequenceNode)
+		if sequenceNode.IsFlowStyle {
+			o.Style = FlowStyle
+		}
+		astSeq := sequenceNode.Values
+		o.Content = make([]*CandidateNode, len(astSeq))
+		for i := 0; i < len(astSeq); i++ {
+			keyNode := o.CreateChild()
+			keyNode.IsMapKey = true
+			keyNode.Tag = "!!int"
+			keyNode.Kind = ScalarNode
+			keyNode.Value = fmt.Sprintf("%v", i)
+
+			valueNode, err := o.goccyDecodeIntoChild(astSeq[i], cm)
+			if err != nil {
+				return err
+			}
+
+			valueNode.Key = keyNode
+			o.Content[i] = valueNode
+		}
+
+	default:
+		log.Debugf("UnmarshalYAML -  node idea of the type!!")
+	}
+	log.Debugf("KIND: %v", o.Kind)
+	return nil
+}
+
+func (o *CandidateNode) goccyProcessMappingValueNode(mappingEntry *ast.MappingValueNode, cm yaml.CommentMap) error {
+	log.Debug("UnmarshalYAML MAP KEY entry %v", mappingEntry.Key)
+	keyNode, err := o.goccyDecodeIntoChild(mappingEntry.Key, cm)
+	if err != nil {
+		return err
+	}
+	keyNode.IsMapKey = true
+
+	log.Debug("UnmarshalYAML MAP VALUE entry %v", mappingEntry.Value)
+	valueNode, err := o.goccyDecodeIntoChild(mappingEntry.Value, cm)
+	if err != nil {
+		return err
+	}
+
+	if mappingEntry.FootComment != nil {
+		valueNode.FootComment = mappingEntry.FootComment.String()
+	}
+	o.AddKeyValueChild(keyNode, valueNode)
+
+	return nil
+}
@@ -0,0 +1,162 @@
+package yqlib
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+type valueRepScenario struct {
+	input    string
+	tag      string
+	expected interface{}
+}
+
+var valueRepScenarios = []valueRepScenario{
+	{
+		input:    `"cat"`,
+		expected: `"cat"`,
+	},
+	{
+		input:    `3`,
+		expected: int64(3),
+	},
+	{
+		input:    `3.1`,
+		expected: float64(3.1),
+	},
+	{
+		input:    `true`,
+		expected: true,
+	},
+	{
+		input:    `y`,
+		tag:      "!!bool",
+		expected: true,
+	},
+	{
+		tag:      "!!null",
+		expected: nil,
+	},
+}
+
+func TestCandidateNodeGetValueRepScenarios(t *testing.T) {
+	for _, tt := range valueRepScenarios {
+		node := CandidateNode{Value: tt.input, Tag: tt.tag}
+		actual, err := node.GetValueRep()
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		test.AssertResult(t, tt.expected, actual)
+	}
+}
+
+func TestCandidateNodeChildWhenParentUpdated(t *testing.T) {
+	parent := CandidateNode{}
+	child := parent.CreateChild()
+	parent.SetDocument(1)
+	parent.SetFileIndex(2)
+	parent.SetFilename("meow")
+	test.AssertResultWithContext(t, "meow", child.GetFilename(), "filename")
+	test.AssertResultWithContext(t, 2, child.GetFileIndex(), "file index")
+	test.AssertResultWithContext(t, uint(1), child.GetDocument(), "document index")
+}
+
+type createScalarNodeScenario struct {
+	value       interface{}
+	stringValue string
+	expectedTag string
+}
+
+var createScalarScenarios = []createScalarNodeScenario{
+	{
+		value:       "mike",
+		stringValue: "mike",
+		expectedTag: "!!str",
+	},
+	{
+		value:       3,
+		stringValue: "3",
+		expectedTag: "!!int",
+	},
+	{
+		value:       3.1,
+		stringValue: "3.1",
+		expectedTag: "!!float",
+	},
+	{
+		value:       true,
+		stringValue: "true",
+		expectedTag: "!!bool",
+	},
+	{
+		value:       nil,
+		stringValue: "~",
+		expectedTag: "!!null",
+	},
+}
+
+func TestCreateScalarNodeScenarios(t *testing.T) {
+	for _, tt := range createScalarScenarios {
+		actual := createScalarNode(tt.value, tt.stringValue)
+		test.AssertResultWithContext(t, tt.stringValue, actual.Value, fmt.Sprintf("Value for: Value: [%v], String: %v", tt.value, tt.stringValue))
+		test.AssertResultWithContext(t, tt.expectedTag, actual.Tag, fmt.Sprintf("Value for: Value: [%v], String: %v", tt.value, tt.stringValue))
+	}
+}
+
+func TestGetKeyForMapValue(t *testing.T) {
+	key := createStringScalarNode("yourKey")
+	n := CandidateNode{Key: key, Value: "meow", document: 3}
+	test.AssertResult(t, "3 - yourKey", n.GetKey())
+}
+
+func TestGetKeyForMapKey(t *testing.T) {
+	key := createStringScalarNode("yourKey")
+	key.IsMapKey = true
+	key.document = 3
+	test.AssertResult(t, "key-yourKey-3 - ", key.GetKey())
+}
+
+func TestGetKeyForValue(t *testing.T) {
+	n := CandidateNode{Value: "meow", document: 3}
+	test.AssertResult(t, "3 - ", n.GetKey())
+}
+
+func TestGetParsedKeyForMapKey(t *testing.T) {
+	key := createStringScalarNode("yourKey")
+	key.IsMapKey = true
+	key.document = 3
+	test.AssertResult(t, "yourKey", key.getParsedKey())
+}
+
+func TestGetParsedKeyForLooseValue(t *testing.T) {
+	n := CandidateNode{Value: "meow", document: 3}
+	test.AssertResult(t, nil, n.getParsedKey())
+}
+
+func TestGetParsedKeyForMapValue(t *testing.T) {
+	key := createStringScalarNode("yourKey")
+	n := CandidateNode{Key: key, Value: "meow", document: 3}
+	test.AssertResult(t, "yourKey", n.getParsedKey())
+}
+
+func TestGetParsedKeyForArrayValue(t *testing.T) {
+	key := createScalarNode(4, "4")
+	n := CandidateNode{Key: key, Value: "meow", document: 3}
+	test.AssertResult(t, 4, n.getParsedKey())
+}
+
+func TestCandidateNodeAddKeyValueChild(t *testing.T) {
+	key := CandidateNode{Value: "cool", IsMapKey: true}
+	node := CandidateNode{}
+
+	// if we use a key in a new node as a value, it should no longer be marked as a key
+
+	_, keyIsValueNow := node.AddKeyValueChild(&CandidateNode{Value: "newKey"}, &key)
+
+	test.AssertResult(t, keyIsValueNow.IsMapKey, false)
+	test.AssertResult(t, key.IsMapKey, true)
+
+}
@@ -0,0 +1,218 @@
+package yqlib
+
+import (
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func MapYamlStyle(original yaml.Style) Style {
+	switch original {
+	case yaml.TaggedStyle:
+		return TaggedStyle
+	case yaml.DoubleQuotedStyle:
+		return DoubleQuotedStyle
+	case yaml.SingleQuotedStyle:
+		return SingleQuotedStyle
+	case yaml.LiteralStyle:
+		return LiteralStyle
+	case yaml.FoldedStyle:
+		return FoldedStyle
+	case yaml.FlowStyle:
+		return FlowStyle
+	case 0:
+		return 0
+	}
+	return Style(original)
+}
+
+func MapToYamlStyle(original Style) yaml.Style {
+	switch original {
+	case TaggedStyle:
+		return yaml.TaggedStyle
+	case DoubleQuotedStyle:
+		return yaml.DoubleQuotedStyle
+	case SingleQuotedStyle:
+		return yaml.SingleQuotedStyle
+	case LiteralStyle:
+		return yaml.LiteralStyle
+	case FoldedStyle:
+		return yaml.FoldedStyle
+	case FlowStyle:
+		return yaml.FlowStyle
+	case 0:
+		return 0
+	}
+	return yaml.Style(original)
+}
+
+func (o *CandidateNode) copyFromYamlNode(node *yaml.Node, anchorMap map[string]*CandidateNode) {
+	o.Style = MapYamlStyle(node.Style)
+
+	o.Tag = node.Tag
+	o.Value = node.Value
+	o.Anchor = node.Anchor
+
+	if o.Anchor != "" {
+		anchorMap[o.Anchor] = o
+		log.Debug("set anchor %v to %v", o.Anchor, NodeToString(o))
+	}
+
+	// its a single alias
+	if node.Alias != nil && node.Alias.Anchor != "" {
+		o.Alias = anchorMap[node.Alias.Anchor]
+		log.Debug("set alias to %v", NodeToString(anchorMap[node.Alias.Anchor]))
+	}
+	o.HeadComment = node.HeadComment
+	o.LineComment = node.LineComment
+	o.FootComment = node.FootComment
+
+	o.Line = node.Line
+	o.Column = node.Column
+}
+
+func (o *CandidateNode) copyToYamlNode(node *yaml.Node) {
+	node.Style = MapToYamlStyle(o.Style)
+
+	node.Tag = o.Tag
+	node.Value = o.Value
+	node.Anchor = o.Anchor
+
+	// node.Alias = TODO - find Alias in our own structure
+	// might need to be a post process thing
+
+	node.HeadComment = o.HeadComment
+
+	node.LineComment = o.LineComment
+	node.FootComment = o.FootComment
+
+	node.Line = o.Line
+	node.Column = o.Column
+}
+
+func (o *CandidateNode) decodeIntoChild(childNode *yaml.Node, anchorMap map[string]*CandidateNode) (*CandidateNode, error) {
+	newChild := o.CreateChild()
+
+	// null yaml.Nodes to not end up calling UnmarshalYAML
+	// so we call it explicitly
+	if childNode.Tag == "!!null" {
+		newChild.Kind = ScalarNode
+		newChild.copyFromYamlNode(childNode, anchorMap)
+		return newChild, nil
+	}
+
+	err := newChild.UnmarshalYAML(childNode, anchorMap)
+	return newChild, err
+}
+
+func (o *CandidateNode) UnmarshalYAML(node *yaml.Node, anchorMap map[string]*CandidateNode) error {
+	log.Debugf("UnmarshalYAML %v", node.Tag)
+	switch node.Kind {
+	case yaml.AliasNode:
+		log.Debug("UnmarshalYAML - alias from yaml: %v", o.Tag)
+		o.Kind = AliasNode
+		o.copyFromYamlNode(node, anchorMap)
+		return nil
+	case yaml.ScalarNode:
+		log.Debugf("UnmarshalYAML -  a scalar")
+		o.Kind = ScalarNode
+		o.copyFromYamlNode(node, anchorMap)
+		return nil
+	case yaml.MappingNode:
+		log.Debugf("UnmarshalYAML -  a mapping node")
+		o.Kind = MappingNode
+		o.copyFromYamlNode(node, anchorMap)
+		o.Content = make([]*CandidateNode, len(node.Content))
+		for i := 0; i < len(node.Content); i += 2 {
+
+			keyNode, err := o.decodeIntoChild(node.Content[i], anchorMap)
+			if err != nil {
+				return err
+			}
+
+			keyNode.IsMapKey = true
+
+			valueNode, err := o.decodeIntoChild(node.Content[i+1], anchorMap)
+			if err != nil {
+				return err
+			}
+
+			valueNode.Key = keyNode
+
+			o.Content[i] = keyNode
+			o.Content[i+1] = valueNode
+		}
+		log.Debugf("UnmarshalYAML -  finished mapping node")
+		return nil
+	case yaml.SequenceNode:
+		log.Debugf("UnmarshalYAML -  a sequence: %v", len(node.Content))
+		o.Kind = SequenceNode
+
+		o.copyFromYamlNode(node, anchorMap)
+		log.Debugf("node Style: %v", node.Style)
+		log.Debugf("o Style: %v", o.Style)
+		o.Content = make([]*CandidateNode, len(node.Content))
+		for i := 0; i < len(node.Content); i++ {
+			keyNode := o.CreateChild()
+			keyNode.IsMapKey = true
+			keyNode.Tag = "!!int"
+			keyNode.Kind = ScalarNode
+			keyNode.Value = fmt.Sprintf("%v", i)
+
+			valueNode, err := o.decodeIntoChild(node.Content[i], anchorMap)
+			if err != nil {
+				return err
+			}
+
+			valueNode.Key = keyNode
+			o.Content[i] = valueNode
+		}
+		return nil
+	case 0:
+		// not sure when this happens
+		o.copyFromYamlNode(node, anchorMap)
+		log.Debugf("UnmarshalYAML -  err.. %v", NodeToString(o))
+		return nil
+	default:
+		return fmt.Errorf("orderedMap: invalid yaml node")
+	}
+}
+
+func (o *CandidateNode) MarshalYAML() (*yaml.Node, error) {
+	log.Debug("MarshalYAML to yaml: %v", o.Tag)
+	switch o.Kind {
+	case AliasNode:
+		log.Debug("MarshalYAML - alias to yaml: %v", o.Tag)
+		target := &yaml.Node{Kind: yaml.AliasNode}
+		o.copyToYamlNode(target)
+		return target, nil
+	case ScalarNode:
+		log.Debug("MarshalYAML - scalar: %v", o.Value)
+		target := &yaml.Node{Kind: yaml.ScalarNode}
+		o.copyToYamlNode(target)
+		return target, nil
+	case MappingNode, SequenceNode:
+		targetKind := yaml.MappingNode
+		if o.Kind == SequenceNode {
+			targetKind = yaml.SequenceNode
+		}
+		target := &yaml.Node{Kind: targetKind}
+		o.copyToYamlNode(target)
+		log.Debugf("original style: %v", o.Style)
+		log.Debugf("original: %v, tag: %v, style: %v, kind: %v", NodeToString(o), target.Tag, target.Style, target.Kind == yaml.SequenceNode)
+		target.Content = make([]*yaml.Node, len(o.Content))
+		for i := 0; i < len(o.Content); i++ {
+
+			child, err := o.Content[i].MarshalYAML()
+
+			if err != nil {
+				return nil, err
+			}
+			target.Content[i] = child
+		}
+		return target, nil
+	}
+	target := &yaml.Node{}
+	o.copyToYamlNode(target)
+	return target, nil
+}
@@ -0,0 +1,177 @@
+package yqlib
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/goccy/go-json"
+)
+
+func (o *CandidateNode) setScalarFromJson(value interface{}) error {
+	o.Kind = ScalarNode
+	switch rawData := value.(type) {
+	case nil:
+		o.Tag = "!!null"
+		o.Value = "null"
+	case float64, float32:
+		o.Value = fmt.Sprintf("%v", value)
+		o.Tag = "!!float"
+		// json decoder returns ints as float.
+		if value == float64(int64(rawData.(float64))) {
+			// aha it's an int disguised as a float
+			o.Tag = "!!int"
+			o.Value = fmt.Sprintf("%v", int64(value.(float64)))
+		}
+	case int, int64, int32:
+		o.Value = fmt.Sprintf("%v", value)
+		o.Tag = "!!int"
+	case bool:
+		o.Value = fmt.Sprintf("%v", value)
+		o.Tag = "!!bool"
+	case string:
+		o.Value = rawData
+		o.Tag = "!!str"
+	default:
+		return fmt.Errorf("unrecognised type :( %v", rawData)
+	}
+	return nil
+}
+
+func (o *CandidateNode) UnmarshalJSON(data []byte) error {
+	log.Debug("UnmarshalJSON")
+	switch data[0] {
+	case '{':
+		log.Debug("UnmarshalJSON -  its a map!")
+		// its a map
+		o.Kind = MappingNode
+		o.Tag = "!!map"
+
+		dec := json.NewDecoder(bytes.NewReader(data))
+		_, err := dec.Token() // open object
+		if err != nil {
+			return err
+		}
+
+		// cycle through k/v
+		var tok json.Token
+		for tok, err = dec.Token(); err == nil; tok, err = dec.Token() {
+			// we can expect two types: string or Delim. Delim automatically means
+			// that it is the closing bracket of the object, whereas string means
+			// that there is another key.
+			if _, ok := tok.(json.Delim); ok {
+				break
+			}
+
+			childKey := o.CreateChild()
+			childKey.IsMapKey = true
+			childKey.Value = tok.(string)
+			childKey.Kind = ScalarNode
+			childKey.Tag = "!!str"
+
+			childValue := o.CreateChild()
+			childValue.Key = childKey
+
+			if err := dec.Decode(childValue); err != nil {
+				return err
+			}
+			o.Content = append(o.Content, childKey, childValue)
+		}
+		// unexpected error
+		if err != nil && !errors.Is(err, io.EOF) {
+			return err
+		}
+		return nil
+	case '[':
+		o.Kind = SequenceNode
+		o.Tag = "!!seq"
+		log.Debug("UnmarshalJSON -  its an array!")
+		var children []*CandidateNode
+		if err := json.Unmarshal(data, &children); err != nil {
+			return err
+		}
+		// now we put the children into the content, and set a key value for them
+		for i, child := range children {
+
+			if child == nil {
+				// need to represent it as a null scalar
+				child = createScalarNode(nil, "null")
+			}
+			childKey := o.CreateChild()
+			childKey.Kind = ScalarNode
+			childKey.Tag = "!!int"
+			childKey.Value = fmt.Sprintf("%v", i)
+			childKey.IsMapKey = true
+
+			child.Parent = o
+			child.Key = childKey
+			o.Content = append(o.Content, child)
+		}
+		return nil
+	}
+	log.Debug("UnmarshalJSON -  its a scalar!")
+	// otherwise, must be a scalar
+	var scalar interface{}
+	err := json.Unmarshal(data, &scalar)
+
+	if err != nil {
+		return err
+	}
+	log.Debug("UnmarshalJSON -  scalar is %v", scalar)
+
+	return o.setScalarFromJson(scalar)
+
+}
+
+func (o *CandidateNode) MarshalJSON() ([]byte, error) {
+	log.Debugf("MarshalJSON %v", NodeToString(o))
+	buf := new(bytes.Buffer)
+	enc := json.NewEncoder(buf)
+	enc.SetIndent("", " ")
+	enc.SetEscapeHTML(false) // do not escape html chars e.g. &, <, >
+
+	switch o.Kind {
+	case AliasNode:
+		log.Debugf("MarshalJSON AliasNode")
+		err := enc.Encode(o.Alias)
+		return buf.Bytes(), err
+	case ScalarNode:
+		log.Debugf("MarshalJSON ScalarNode")
+		value, err := o.GetValueRep()
+		if err != nil {
+			return buf.Bytes(), err
+		}
+		err = enc.Encode(value)
+		return buf.Bytes(), err
+	case MappingNode:
+		log.Debugf("MarshalJSON MappingNode")
+		buf.WriteByte('{')
+		for i := 0; i < len(o.Content); i += 2 {
+			if err := enc.Encode(o.Content[i].Value); err != nil {
+				return nil, err
+			}
+			buf.WriteByte(':')
+			if err := enc.Encode(o.Content[i+1]); err != nil {
+				return nil, err
+			}
+			if i != len(o.Content)-2 {
+				buf.WriteByte(',')
+			}
+		}
+		buf.WriteByte('}')
+		return buf.Bytes(), nil
+	case SequenceNode:
+		log.Debugf("MarshalJSON SequenceNode, %v, len: %v", o.Content, len(o.Content))
+		var err error
+		if len(o.Content) == 0 {
+			buf.WriteString("[]")
+		} else {
+			err = enc.Encode(o.Content)
+		}
+		return buf.Bytes(), err
+	default:
+		err := enc.Encode(nil)
+		return buf.Bytes(), err
+	}
+}
@@ -0,0 +1,25 @@
+//go:build linux
+
+package yqlib
+
+import (
+	"io/fs"
+	"os"
+	"syscall"
+)
+
+func changeOwner(info fs.FileInfo, file *os.File) error {
+	if stat, ok := info.Sys().(*syscall.Stat_t); ok {
+		uid := int(stat.Uid)
+		gid := int(stat.Gid)
+
+		err := os.Chown(file.Name(), uid, gid)
+		if err != nil {
+			// this happens with snap confinement
+			// not really a big issue as users can chown
+			// the file themselves if required.
+			log.Info("Skipping chown: %v", err)
+		}
+	}
+	return nil
+}
@@ -0,0 +1,12 @@
+//go:build !linux
+
+package yqlib
+
+import (
+	"io/fs"
+	"os"
+)
+
+func changeOwner(info fs.FileInfo, file *os.File) error {
+	return nil
+}
@@ -3,8 +3,8 @@ package yqlib
 import (
 	"container/list"
 	"fmt"
+	"time"

-	"github.com/jinzhu/copier"
 	logging "gopkg.in/op/go-logging.v1"
 )

@@ -12,6 +12,7 @@ type Context struct {
 	MatchingNodes  *list.List
 	Variables      map[string]*list.List
 	DontAutoCreate bool
+	datetimeLayout string
 }

 func (n *Context) SingleReadonlyChildContext(candidate *CandidateNode) Context {
@@ -28,6 +29,17 @@ func (n *Context) SingleChildContext(candidate *CandidateNode) Context {
 	return n.ChildContext(list)
 }

+func (n *Context) SetDateTimeLayout(newDateTimeLayout string) {
+	n.datetimeLayout = newDateTimeLayout
+}
+
+func (n *Context) GetDateTimeLayout() string {
+	if n.datetimeLayout != "" {
+		return n.datetimeLayout
+	}
+	return time.RFC3339
+}
+
 func (n *Context) GetVariable(name string) *list.List {
 	if n.Variables == nil {
 		return nil
@@ -43,15 +55,21 @@ func (n *Context) SetVariable(name string, value *list.List) {
 }

 func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{DontAutoCreate: n.DontAutoCreate}
+	clone := Context{DontAutoCreate: n.DontAutoCreate, datetimeLayout: n.datetimeLayout}
 	clone.Variables = make(map[string]*list.List)
-	if len(n.Variables) > 0 {
-		err := copier.Copy(&clone.Variables, n.Variables)
-		if err != nil {
-			log.Error("Error cloning context :(")
-			panic(err)
+	for variableKey, originalValueList := range n.Variables {
+
+		variableCopyList := list.New()
+		for el := originalValueList.Front(); el != nil; el = el.Next() {
+			// note that we dont make a copy of the candidate node
+			// this is so the 'ref' operator can work correctly.
+			clonedNode := el.Value.(*CandidateNode)
+			variableCopyList.PushBack(clonedNode)
 		}
+
+		clone.Variables[variableKey] = variableCopyList
 	}
+
 	clone.MatchingNodes = results
 	return clone
 }
@@ -65,35 +83,18 @@ func (n *Context) ToString() string {
 }

 func (n *Context) DeepClone() Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-	// copier doesn't do lists properly for some reason
-	clone.MatchingNodes = list.New()
+
+	clonedContent := list.New()
 	for el := n.MatchingNodes.Front(); el != nil; el = el.Next() {
-		clonedNode, err := el.Value.(*CandidateNode).Copy()
-		if err != nil {
-			log.Error("Error cloning context :(")
-			panic(err)
-		}
-		clone.MatchingNodes.PushBack(clonedNode)
+		clonedNode := el.Value.(*CandidateNode).Copy()
+		clonedContent.PushBack(clonedNode)
 	}

-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	return clone
+	return n.ChildContext(clonedContent)
 }

 func (n *Context) Clone() Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	return clone
+	return n.ChildContext(n.MatchingNodes)
 }

 func (n *Context) ReadOnlyClone() Context {
@@ -0,0 +1,51 @@
+package yqlib
+
+import (
+	"container/list"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+func TestChildContext(t *testing.T) {
+
+	expectedOriginal := make(map[string]*list.List)
+	expectedOriginal["dog"] = list.New()
+	expectedOriginal["dog"].PushBack(&CandidateNode{Value: "woof"})
+
+	originalVariables := make(map[string]*list.List)
+	originalVariables["dog"] = list.New()
+	originalVariables["dog"].PushBack(&CandidateNode{Value: "woof"})
+
+	original := Context{
+		DontAutoCreate: true,
+		datetimeLayout: "cat",
+		Variables:      originalVariables,
+	}
+
+	newResults := list.New()
+	newResults.PushBack(&CandidateNode{Value: "bar"})
+
+	clone := original.ChildContext(newResults)
+	test.AssertResultComplex(t, originalVariables, clone.Variables)
+
+	clone.Variables["dog"].PushBack("bark")
+	// ensure this is a separate copy
+	test.AssertResultComplex(t, 1, originalVariables["dog"].Len())
+
+}
+
+func TestChildContextNoVariables(t *testing.T) {
+
+	original := Context{
+		DontAutoCreate: true,
+		datetimeLayout: "cat",
+	}
+
+	newResults := list.New()
+	newResults.PushBack(&CandidateNode{Value: "bar"})
+
+	clone := original.ChildContext(newResults)
+	test.AssertResultComplex(t, make(map[string]*list.List), clone.Variables)
+
+}
@@ -0,0 +1,23 @@
+package yqlib
+
+type CsvPreferences struct {
+	Separator rune
+	AutoParse bool
+}
+
+func NewDefaultCsvPreferences() CsvPreferences {
+	return CsvPreferences{
+		Separator: ',',
+		AutoParse: true,
+	}
+}
+
+func NewDefaultTsvPreferences() CsvPreferences {
+	return CsvPreferences{
+		Separator: '\t',
+		AutoParse: true,
+	}
+}
+
+var ConfiguredCsvPreferences = NewDefaultCsvPreferences()
+var ConfiguredTsvPreferences = NewDefaultTsvPreferences()
@@ -0,0 +1,383 @@
+package yqlib
+
+import (
+	"bufio"
+	"fmt"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+const csvSimple = `name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+
+const csvSimpleWithObject = `name,numberOfCats,likesApples,height,facts
+Gary,1,true,168.8,cool: true
+Samantha's Rabbit,2,false,-188.8,tall: indeed
+`
+const csvMissing = `name,numberOfCats,likesApples,height
+,null,,168.8
+`
+const expectedUpdatedSimpleCsv = `name,numberOfCats,likesApples,height
+Gary,3,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+
+const csvSimpleShort = `Name,Number of Cats
+Gary,1
+Samantha's Rabbit,2
+`
+
+const tsvSimple = `name	numberOfCats	likesApples	height
+Gary	1	true	168.8
+Samantha's Rabbit	2	false	-188.8
+`
+
+const expectedYamlFromCSV = `- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+`
+const expectedYamlFromCSVWithObject = `- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+  facts:
+    cool: true
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+  facts:
+    tall: indeed
+`
+
+const expectedYamlFromCSVNoParsing = `- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+  facts: 'cool: true'
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+  facts: 'tall: indeed'
+`
+
+const expectedYamlFromCSVMissingData = `- name: Gary
+  numberOfCats: 1
+  height: 168.8
+- name: Samantha's Rabbit
+  height: -188.8
+  likesApples: false
+`
+
+const csvSimpleMissingData = `name,numberOfCats,height
+Gary,1,168.8
+Samantha's Rabbit,,-188.8
+`
+
+const csvTestSimpleYaml = `- [i, like, csv]
+- [because, excel, is, cool]`
+
+const expectedSimpleCsv = `i,like,csv
+because,excel,is,cool
+`
+
+const tsvTestExpectedSimpleCsv = `i	like	csv
+because	excel	is	cool
+`
+
+var csvScenarios = []formatScenario{
+	{
+		description:  "Encode CSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     expectedSimpleCsv,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode TSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     tsvTestExpectedSimpleCsv,
+		scenarioType: "encode-tsv",
+	},
+	{
+		description:  "Encode Empty",
+		skipDoc:      true,
+		input:        `[]`,
+		expected:     "",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Comma in value",
+		skipDoc:      true,
+		input:        `["comma, in, value", things]`,
+		expected:     "\"comma, in, value\",things\n",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode array of objects to csv",
+		input:        expectedYamlFromCSV,
+		expected:     csvSimple,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to custom csv format",
+		subdescription: "Add the header row manually, then the we convert each object into an array of values - resulting in an array of arrays. Pick the columns and call the header whatever you like.",
+		input:          expectedYamlFromCSV,
+		expected:       csvSimpleShort,
+		expression:     `[["Name", "Number of Cats"]] +  [.[] | [.name, .numberOfCats ]]`,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to csv - missing fields behaviour",
+		subdescription: "First entry is used to determine the headers, and it is missing 'likesApples', so it is not included in the csv. Second entry does not have 'numberOfCats' so that is blank",
+		input:          expectedYamlFromCSVMissingData,
+		expected:       csvSimpleMissingData,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:  "decode csv missing",
+		skipDoc:      true,
+		input:        csvMissing,
+		expected:     csvMissing,
+		scenarioType: "roundtrip-csv",
+	},
+	{
+		description:  "decode csv key",
+		skipDoc:      true,
+		input:        csvSimple,
+		expression:   ".[0].name | key",
+		expected:     "name\n",
+		scenarioType: "decode-csv",
+	},
+	{
+		description:  "decode csv parent",
+		skipDoc:      true,
+		input:        csvSimple,
+		expression:   ".[0].name | parent | .height",
+		expected:     "168.8\n",
+		scenarioType: "decode-csv",
+	},
+	{
+		description:    "Parse CSV into an array of objects",
+		subdescription: "First row is assumed to be the header row. By default, entries with YAML/JSON formatting will be parsed!",
+		input:          csvSimpleWithObject,
+		expected:       expectedYamlFromCSVWithObject,
+		scenarioType:   "decode-csv",
+	},
+	{
+		description:  "Decode CSV line breaks",
+		skipDoc:      true,
+		input:        "heading1\n\"some data\nwith a line break\"\n",
+		expected:     "- heading1: |-\n    some data\n    with a line break\n",
+		scenarioType: "decode-csv",
+	},
+	{
+		description:    "Parse CSV into an array of objects, no auto-parsing",
+		subdescription: "First row is assumed to be the header row. Entries with YAML/JSON will be left as strings.",
+		input:          csvSimpleWithObject,
+		expected:       expectedYamlFromCSVNoParsing,
+		scenarioType:   "decode-csv-no-auto",
+	},
+	{
+		description:  "Scalar roundtrip",
+		skipDoc:      true,
+		input:        "mike\ncat",
+		expression:   ".[0].mike",
+		expected:     "cat\n",
+		scenarioType: "roundtrip-csv",
+	},
+	{
+		description:    "Parse TSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          tsvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-tsv-object",
+	},
+	{
+		description:  "Round trip",
+		input:        csvSimple,
+		expected:     expectedUpdatedSimpleCsv,
+		expression:   `(.[] | select(.name == "Gary") | .numberOfCats) = 3`,
+		scenarioType: "roundtrip-csv",
+	},
+}
+
+func testCSVScenario(t *testing.T, s formatScenario) {
+	switch s.scenarioType {
+	case "encode-csv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(ConfiguredCsvPreferences)), s.description)
+	case "encode-tsv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(ConfiguredTsvPreferences)), s.description)
+	case "decode-csv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(ConfiguredCsvPreferences), NewYamlEncoder(ConfiguredYamlPreferences)), s.description)
+	case "decode-csv-no-auto":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(CsvPreferences{Separator: ',', AutoParse: false}), NewYamlEncoder(ConfiguredYamlPreferences)), s.description)
+	case "decode-tsv-object":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(ConfiguredTsvPreferences), NewYamlEncoder(ConfiguredYamlPreferences)), s.description)
+	case "roundtrip-csv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(ConfiguredCsvPreferences), NewCsvEncoder(ConfiguredCsvPreferences)), s.description)
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func documentCSVDecodeObjectScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+	writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v sample.%v\n```\n", formatType, formatType))
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n",
+		mustProcessFormatScenario(s, NewCSVObjectDecoder(CsvPreferences{Separator: separator, AutoParse: true}), NewYamlEncoder(ConfiguredYamlPreferences))),
+	)
+}
+
+func documentCSVDecodeObjectNoAutoScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+	writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v --csv-auto-parse=f sample.%v\n```\n", formatType, formatType))
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n",
+		mustProcessFormatScenario(s, NewCSVObjectDecoder(CsvPreferences{Separator: separator, AutoParse: false}), NewYamlEncoder(ConfiguredYamlPreferences))),
+	)
+}
+
+func documentCSVEncodeScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.yml file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v\n```\n", s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v '%v' sample.yml\n```\n", formatType, expression))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v sample.yml\n```\n", formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+	csvPrefs := NewDefaultCsvPreferences()
+	csvPrefs.Separator = separator
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(csvPrefs))),
+	)
+}
+
+func documentCSVRoundTripScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v '%v' sample.%v\n```\n", formatType, formatType, expression, formatType))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v sample.%v\n```\n", formatType, formatType, formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	csvPrefs := NewDefaultCsvPreferences()
+	csvPrefs.Separator = separator
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		mustProcessFormatScenario(s, NewCSVObjectDecoder(CsvPreferences{Separator: separator, AutoParse: true}), NewCsvEncoder(csvPrefs))),
+	)
+}
+
+func documentCSVScenario(_ *testing.T, w *bufio.Writer, i interface{}) {
+	s := i.(formatScenario)
+	if s.skipDoc {
+		return
+	}
+	switch s.scenarioType {
+	case "encode-csv":
+		documentCSVEncodeScenario(w, s, "csv")
+	case "encode-tsv":
+		documentCSVEncodeScenario(w, s, "tsv")
+	case "decode-csv":
+		documentCSVDecodeObjectScenario(w, s, "csv")
+	case "decode-csv-no-auto":
+		documentCSVDecodeObjectNoAutoScenario(w, s, "csv")
+	case "decode-tsv-object":
+		documentCSVDecodeObjectScenario(w, s, "tsv")
+	case "roundtrip-csv":
+		documentCSVRoundTripScenario(w, s, "csv")
+
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func TestCSVScenarios(t *testing.T) {
+	for _, tt := range csvScenarios {
+		testCSVScenario(t, tt)
+	}
+	genericScenarios := make([]interface{}, len(csvScenarios))
+	for i, s := range csvScenarios {
+		genericScenarios[i] = s
+	}
+	documentScenarios(t, "usage", "csv-tsv", genericScenarios, documentCSVScenario)
+}
@@ -7,10 +7,12 @@ import (
 )

 type DataTreeNavigator interface {
-	// given the context and a expressionNode,
+	// given the context and an expressionNode,
 	// this will process the against the given expressionNode and return
 	// a new context of matching candidates
 	GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error)
+
+	DeeplyAssign(context Context, path []interface{}, rhsNode *CandidateNode) error
 }

 type dataTreeNavigator struct {
@@ -20,6 +22,33 @@ func NewDataTreeNavigator() DataTreeNavigator {
 	return &dataTreeNavigator{}
 }

+func (d *dataTreeNavigator) DeeplyAssign(context Context, path []interface{}, rhsCandidateNode *CandidateNode) error {
+
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+
+	if rhsCandidateNode.Kind == MappingNode {
+		log.Debug("DeeplyAssign: deeply merging object")
+		// if the rhs is a map, we need to deeply merge it in.
+		// otherwise we'll clobber any existing fields
+		assignmentOp = &Operation{OperationType: multiplyAssignOpType, Preferences: multiplyPreferences{
+			AppendArrays:  true,
+			TraversePrefs: traversePreferences{DontFollowAlias: true},
+			AssignPrefs:   assignPreferences{},
+		}}
+	}
+
+	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
 func (d *dataTreeNavigator) GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error) {
 	if expressionNode == nil {
 		log.Debugf("getMatchingNodes - nothing to do")
@@ -31,7 +60,6 @@ func (d *dataTreeNavigator) GetMatchingNodes(context Context, expressionNode *Ex
 			log.Debug(NodeToString(el.Value.(*CandidateNode)))
 		}
 	}
-	log.Debug(">>")
 	handler := expressionNode.Operation.OperationType.Handler
 	if handler != nil {
 		return handler(d, context, expressionNode)
@@ -0,0 +1,10 @@
+package yqlib
+
+import (
+	"io"
+)
+
+type Decoder interface {
+	Init(reader io.Reader) error
+	Decode() (*CandidateNode, error)
+}
@@ -0,0 +1,72 @@
+package yqlib
+
+import (
+	"bytes"
+	"encoding/base64"
+	"io"
+	"strings"
+)
+
+type base64Padder struct {
+	count uint64
+	io.Reader
+}
+
+func (c *base64Padder) pad(buf []byte) (int, error) {
+	pad := strings.Repeat("=", int(4-c.count%4))
+	n, err := strings.NewReader(pad).Read(buf)
+	c.count += uint64(n)
+	return n, err
+}
+
+func (c *base64Padder) Read(buf []byte) (int, error) {
+	n, err := c.Reader.Read(buf)
+	c.count += uint64(n)
+
+	if err == io.EOF && c.count%4 != 0 {
+		return c.pad(buf)
+	}
+	return n, err
+}
+
+type base64Decoder struct {
+	reader       io.Reader
+	finished     bool
+	readAnything bool
+	encoding     base64.Encoding
+}
+
+func NewBase64Decoder() Decoder {
+	return &base64Decoder{finished: false, encoding: *base64.StdEncoding}
+}
+
+func (dec *base64Decoder) Init(reader io.Reader) error {
+	dec.reader = &base64Padder{Reader: reader}
+	dec.readAnything = false
+	dec.finished = false
+	return nil
+}
+
+func (dec *base64Decoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	base64Reader := base64.NewDecoder(&dec.encoding, dec.reader)
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(base64Reader); err != nil {
+		return nil, err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+
+		// if we've read _only_ an empty string, lets return that
+		// otherwise if we've already read some bytes, and now we get
+		// an empty string, then we are done.
+		if dec.readAnything {
+			return nil, io.EOF
+		}
+	}
+	dec.readAnything = true
+	return createStringScalarNode(buf.String()), nil
+}
@@ -0,0 +1,74 @@
+package yqlib
+
+import (
+	"encoding/csv"
+	"errors"
+	"io"
+
+	"github.com/dimchansky/utfbom"
+)
+
+type csvObjectDecoder struct {
+	prefs    CsvPreferences
+	reader   csv.Reader
+	finished bool
+}
+
+func NewCSVObjectDecoder(prefs CsvPreferences) Decoder {
+	return &csvObjectDecoder{prefs: prefs}
+}
+
+func (dec *csvObjectDecoder) Init(reader io.Reader) error {
+	cleanReader, enc := utfbom.Skip(reader)
+	log.Debugf("Detected encoding: %s\n", enc)
+	dec.reader = *csv.NewReader(cleanReader)
+	dec.reader.Comma = dec.prefs.Separator
+	dec.finished = false
+	return nil
+}
+
+func (dec *csvObjectDecoder) convertToNode(content string) *CandidateNode {
+	node, err := parseSnippet(content)
+	// if we're not auto-parsing, then we wont put in parsed objects or arrays
+	// but we still parse scalars
+	if err != nil || (!dec.prefs.AutoParse && node.Kind != ScalarNode) {
+		return createScalarNode(content, content)
+	}
+	return node
+}
+
+func (dec *csvObjectDecoder) createObject(headerRow []string, contentRow []string) *CandidateNode {
+	objectNode := &CandidateNode{Kind: MappingNode, Tag: "!!map"}
+
+	for i, header := range headerRow {
+		objectNode.AddKeyValueChild(createScalarNode(header, header), dec.convertToNode(contentRow[i]))
+	}
+	return objectNode
+}
+
+func (dec *csvObjectDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	headerRow, err := dec.reader.Read()
+	log.Debugf(": headerRow%v", headerRow)
+	if err != nil {
+		return nil, err
+	}
+
+	rootArray := &CandidateNode{Kind: SequenceNode, Tag: "!!seq"}
+
+	contentRow, err := dec.reader.Read()
+
+	for err == nil && len(contentRow) > 0 {
+		log.Debugf("Adding contentRow: %v", contentRow)
+		rootArray.AddChild(dec.createObject(headerRow, contentRow))
+		contentRow, err = dec.reader.Read()
+		log.Debugf("Read next contentRow: %v, %v", contentRow, err)
+	}
+	if !errors.Is(err, io.EOF) {
+		return nil, err
+	}
+
+	return rootArray, nil
+}
@@ -0,0 +1,46 @@
+//go:build !yq_noyaml
+
+//
+// NOTE this is still a WIP - not yet ready.
+//
+
+package yqlib
+
+import (
+	"io"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/goccy/go-yaml/ast"
+)
+
+type goccyYamlDecoder struct {
+	decoder yaml.Decoder
+	cm      yaml.CommentMap
+}
+
+func NewGoccyYAMLDecoder() Decoder {
+	return &goccyYamlDecoder{}
+}
+
+func (dec *goccyYamlDecoder) Init(reader io.Reader) error {
+	dec.cm = yaml.CommentMap{}
+	dec.decoder = *yaml.NewDecoder(reader, yaml.CommentToMap(dec.cm), yaml.UseOrderedMap())
+	return nil
+}
+
+func (dec *goccyYamlDecoder) Decode() (*CandidateNode, error) {
+
+	var ast ast.Node
+
+	err := dec.decoder.Decode(&ast)
+	if err != nil {
+		return nil, err
+	}
+
+	candidateNode := &CandidateNode{}
+	if err := candidateNode.UnmarshalGoccyYAML(ast, dec.cm); err != nil {
+		return nil, err
+	}
+
+	return candidateNode, nil
+}
@@ -0,0 +1,33 @@
+//go:build !yq_nojson
+
+package yqlib
+
+import (
+	"io"
+
+	"github.com/goccy/go-json"
+)
+
+type jsonDecoder struct {
+	decoder json.Decoder
+}
+
+func NewJSONDecoder() Decoder {
+	return &jsonDecoder{}
+}
+
+func (dec *jsonDecoder) Init(reader io.Reader) error {
+	dec.decoder = *json.NewDecoder(reader)
+	return nil
+}
+
+func (dec *jsonDecoder) Decode() (*CandidateNode, error) {
+
+	var dataBucket CandidateNode
+	err := dec.decoder.Decode(&dataBucket)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dataBucket, nil
+}
@@ -0,0 +1,165 @@
+//go:build !yq_nolua
+
+package yqlib
+
+import (
+	"fmt"
+	"io"
+	"math"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+type luaDecoder struct {
+	reader   io.Reader
+	finished bool
+	prefs    LuaPreferences
+}
+
+func NewLuaDecoder(prefs LuaPreferences) Decoder {
+	return &luaDecoder{
+		prefs: prefs,
+	}
+}
+
+func (dec *luaDecoder) Init(reader io.Reader) error {
+	dec.reader = reader
+	return nil
+}
+
+func (dec *luaDecoder) convertToYamlNode(ls *lua.LState, lv lua.LValue) *CandidateNode {
+	switch lv.Type() {
+	case lua.LTNil:
+		return &CandidateNode{
+			Kind:  ScalarNode,
+			Tag:   "!!null",
+			Value: "",
+		}
+	case lua.LTBool:
+		return &CandidateNode{
+			Kind:  ScalarNode,
+			Tag:   "!!bool",
+			Value: lv.String(),
+		}
+	case lua.LTNumber:
+		n := float64(lua.LVAsNumber(lv))
+		// various special case floats
+		if math.IsNaN(n) {
+			return &CandidateNode{
+				Kind:  ScalarNode,
+				Tag:   "!!float",
+				Value: ".nan",
+			}
+		}
+		if math.IsInf(n, 1) {
+			return &CandidateNode{
+				Kind:  ScalarNode,
+				Tag:   "!!float",
+				Value: ".inf",
+			}
+		}
+		if math.IsInf(n, -1) {
+			return &CandidateNode{
+				Kind:  ScalarNode,
+				Tag:   "!!float",
+				Value: "-.inf",
+			}
+		}
+
+		// does it look like an integer?
+		if n == float64(int(n)) {
+			return &CandidateNode{
+				Kind:  ScalarNode,
+				Tag:   "!!int",
+				Value: lv.String(),
+			}
+		}
+
+		return &CandidateNode{
+			Kind:  ScalarNode,
+			Tag:   "!!float",
+			Value: lv.String(),
+		}
+	case lua.LTString:
+		return &CandidateNode{
+			Kind:  ScalarNode,
+			Tag:   "!!str",
+			Value: lv.String(),
+		}
+	case lua.LTFunction:
+		return &CandidateNode{
+			Kind:  ScalarNode,
+			Tag:   "tag:lua.org,2006,function",
+			Value: lv.String(),
+		}
+	case lua.LTTable:
+		// Simultaneously create a sequence and a map, pick which one to return
+		// based on whether all keys were consecutive integers
+		i := 1
+		yaml_sequence := &CandidateNode{
+			Kind: SequenceNode,
+			Tag:  "!!seq",
+		}
+		yaml_map := &CandidateNode{
+			Kind: MappingNode,
+			Tag:  "!!map",
+		}
+		t := lv.(*lua.LTable)
+		k, v := ls.Next(t, lua.LNil)
+		for k != lua.LNil {
+			if ki, ok := k.(lua.LNumber); i != 0 && ok && math.Mod(float64(ki), 1) == 0 && int(ki) == i {
+				i++
+			} else {
+				i = 0
+			}
+			newKey := dec.convertToYamlNode(ls, k)
+
+			yv := dec.convertToYamlNode(ls, v)
+			yaml_map.AddKeyValueChild(newKey, yv)
+
+			if i != 0 {
+				yaml_sequence.AddChild(yv)
+			}
+			k, v = ls.Next(t, k)
+		}
+		if i != 0 {
+			return yaml_sequence
+		}
+		return yaml_map
+	default:
+		return &CandidateNode{
+			Kind:        ScalarNode,
+			LineComment: fmt.Sprintf("Unhandled Lua type: %s", lv.Type().String()),
+			Tag:         "!!null",
+			Value:       lv.String(),
+		}
+	}
+}
+
+func (dec *luaDecoder) decideTopLevelNode(ls *lua.LState) *CandidateNode {
+	if ls.GetTop() == 0 {
+		// no items were explicitly returned, encode the globals table instead
+		return dec.convertToYamlNode(ls, ls.Get(lua.GlobalsIndex))
+	}
+	return dec.convertToYamlNode(ls, ls.Get(1))
+}
+
+func (dec *luaDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	ls := lua.NewState(lua.Options{SkipOpenLibs: true})
+	defer ls.Close()
+	fn, err := ls.Load(dec.reader, "@input")
+	if err != nil {
+		return nil, err
+	}
+	ls.Push(fn)
+	err = ls.PCall(0, lua.MultRet, nil)
+	if err != nil {
+		return nil, err
+	}
+	firstNode := dec.decideTopLevelNode(ls)
+	dec.finished = true
+	return firstNode, nil
+}
@@ -0,0 +1,129 @@
+package yqlib
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/magiconair/properties"
+)
+
+type propertiesDecoder struct {
+	reader   io.Reader
+	finished bool
+	d        DataTreeNavigator
+}
+
+func NewPropertiesDecoder() Decoder {
+	return &propertiesDecoder{d: NewDataTreeNavigator(), finished: false}
+}
+
+func (dec *propertiesDecoder) Init(reader io.Reader) error {
+	dec.reader = reader
+	dec.finished = false
+	return nil
+}
+
+func parsePropKey(key string) []interface{} {
+	pathStrArray := strings.Split(key, ".")
+	path := make([]interface{}, len(pathStrArray))
+	for i, pathStr := range pathStrArray {
+		num, err := strconv.ParseInt(pathStr, 10, 32)
+		if err == nil {
+			path[i] = num
+		} else {
+			path[i] = pathStr
+		}
+	}
+	return path
+}
+
+func (dec *propertiesDecoder) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	return "# " + c
+}
+
+func (dec *propertiesDecoder) applyPropertyComments(context Context, path []interface{}, comments []string) error {
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+
+	rhsCandidateNode := &CandidateNode{
+		Tag:         "!!str",
+		Value:       fmt.Sprintf("%v", path[len(path)-1]),
+		HeadComment: dec.processComment(strings.Join(comments, "\n")),
+		Kind:        ScalarNode,
+	}
+
+	rhsCandidateNode.Tag = rhsCandidateNode.guessTagFromCustomType()
+
+	rhsOp := &Operation{OperationType: referenceOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, true),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := dec.d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
+func (dec *propertiesDecoder) applyProperty(context Context, properties *properties.Properties, key string) error {
+	value, _ := properties.Get(key)
+	path := parsePropKey(key)
+
+	propertyComments := properties.GetComments(key)
+	if len(propertyComments) > 0 {
+		err := dec.applyPropertyComments(context, path, propertyComments)
+		if err != nil {
+			return nil
+		}
+	}
+
+	rhsNode := createStringScalarNode(value)
+	rhsNode.Tag = rhsNode.guessTagFromCustomType()
+
+	return dec.d.DeeplyAssign(context, path, rhsNode)
+}
+
+func (dec *propertiesDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(dec.reader); err != nil {
+		return nil, err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+		return nil, io.EOF
+	}
+	properties, err := properties.LoadString(buf.String())
+	if err != nil {
+		return nil, err
+	}
+	properties.DisableExpansion = true
+
+	rootMap := &CandidateNode{
+		Kind: MappingNode,
+		Tag:  "!!map",
+	}
+
+	context := Context{}
+	context = context.SingleChildContext(rootMap)
+
+	for _, key := range properties.Keys() {
+		if err := dec.applyProperty(context, properties, key); err != nil {
+			return nil, err
+		}
+
+	}
+	dec.finished = true
+
+	return rootMap, nil
+
+}
@@ -0,0 +1,75 @@
+package yqlib
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"strings"
+)
+
+type formatScenario struct {
+	input          string
+	indent         int
+	expression     string
+	expected       string
+	description    string
+	subdescription string
+	skipDoc        bool
+	scenarioType   string
+	expectedError  string
+}
+
+func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) (string, error) {
+	var output bytes.Buffer
+	writer := bufio.NewWriter(&output)
+
+	if decoder == nil {
+		decoder = NewYamlDecoder(ConfiguredYamlPreferences)
+	}
+
+	log.Debugf("reading docs")
+	inputs, err := readDocuments(strings.NewReader(s.input), "sample.yml", 0, decoder)
+	if err != nil {
+		return "", err
+	}
+
+	log.Debugf("done reading the documents")
+
+	expression := s.expression
+	if expression == "" {
+		expression = "."
+	}
+
+	exp, err := getExpressionParser().ParseExpression(expression)
+
+	if err != nil {
+		return "", err
+	}
+
+	context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: inputs}, exp)
+
+	log.Debugf("Going to print: %v", NodesToString(context.MatchingNodes))
+
+	if err != nil {
+		return "", err
+	}
+
+	printer := NewPrinter(encoder, NewSinglePrinterWriter(writer))
+	err = printer.PrintResults(context.MatchingNodes)
+	if err != nil {
+		return "", err
+	}
+	writer.Flush()
+
+	return output.String(), nil
+}
+
+func mustProcessFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) string {
+
+	result, err := processFormatScenario(s, decoder, encoder)
+	if err != nil {
+		panic(fmt.Errorf("Bad scenario %v: %w", s.description, err))
+	}
+	return result
+
+}
@@ -0,0 +1,357 @@
+//go:build !yq_notoml
+
+package yqlib
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+
+	toml "github.com/pelletier/go-toml/v2/unstable"
+)
+
+type tomlDecoder struct {
+	parser   toml.Parser
+	finished bool
+	d        DataTreeNavigator
+	rootMap  *CandidateNode
+}
+
+func NewTomlDecoder() Decoder {
+	return &tomlDecoder{
+		finished: false,
+		d:        NewDataTreeNavigator(),
+	}
+}
+
+func (dec *tomlDecoder) Init(reader io.Reader) error {
+	dec.parser = toml.Parser{}
+	buf := new(bytes.Buffer)
+	_, err := buf.ReadFrom(reader)
+	if err != nil {
+		return err
+	}
+	dec.parser.Reset(buf.Bytes())
+	dec.rootMap = &CandidateNode{
+		Kind: MappingNode,
+		Tag:  "!!map",
+	}
+	return nil
+}
+
+func (dec *tomlDecoder) getFullPath(tomlNode *toml.Node) []interface{} {
+	path := make([]interface{}, 0)
+	for {
+		path = append(path, string(tomlNode.Data))
+		tomlNode = tomlNode.Next()
+		if tomlNode == nil {
+			return path
+		}
+	}
+}
+
+func (dec *tomlDecoder) processKeyValueIntoMap(rootMap *CandidateNode, tomlNode *toml.Node) error {
+	value := tomlNode.Value()
+	path := dec.getFullPath(value.Next())
+	log.Debug("processKeyValueIntoMap: %v", path)
+
+	valueNode, err := dec.decodeNode(value)
+	if err != nil {
+		return err
+	}
+
+	context := Context{}
+	context = context.SingleChildContext(rootMap)
+
+	return dec.d.DeeplyAssign(context, path, valueNode)
+}
+
+func (dec *tomlDecoder) decodeKeyValuesIntoMap(rootMap *CandidateNode, tomlNode *toml.Node) (bool, error) {
+	log.Debug("decodeKeyValuesIntoMap -- processing first (current) entry")
+	if err := dec.processKeyValueIntoMap(rootMap, tomlNode); err != nil {
+		return false, err
+	}
+
+	for dec.parser.NextExpression() {
+		nextItem := dec.parser.Expression()
+		log.Debug("decodeKeyValuesIntoMap -- next exp, its a %v", nextItem.Kind)
+
+		if nextItem.Kind == toml.KeyValue {
+			if err := dec.processKeyValueIntoMap(rootMap, nextItem); err != nil {
+				return false, err
+			}
+		} else {
+			// run out of key values
+			log.Debug("done in decodeKeyValuesIntoMap, gota a %v", nextItem.Kind)
+			return true, nil
+		}
+	}
+	log.Debug("no more things to read in")
+	return false, nil
+}
+
+func (dec *tomlDecoder) createInlineTableMap(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := make([]*CandidateNode, 0)
+	log.Debug("createInlineTableMap")
+
+	iterator := tomlNode.Children()
+	for iterator.Next() {
+		child := iterator.Node()
+		if child.Kind != toml.KeyValue {
+			return nil, fmt.Errorf("only keyvalue pairs are supported in inlinetables, got %v instead", child.Kind)
+		}
+
+		keyValues := &CandidateNode{
+			Kind: MappingNode,
+			Tag:  "!!map",
+		}
+
+		if err := dec.processKeyValueIntoMap(keyValues, child); err != nil {
+			return nil, err
+		}
+
+		content = append(content, keyValues.Content...)
+	}
+
+	return &CandidateNode{
+		Kind:    MappingNode,
+		Tag:     "!!map",
+		Content: content,
+	}, nil
+}
+
+func (dec *tomlDecoder) createArray(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := make([]*CandidateNode, 0)
+	iterator := tomlNode.Children()
+	for iterator.Next() {
+		child := iterator.Node()
+		yamlNode, err := dec.decodeNode(child)
+		if err != nil {
+			return nil, err
+		}
+		content = append(content, yamlNode)
+	}
+
+	return &CandidateNode{
+		Kind:    SequenceNode,
+		Tag:     "!!seq",
+		Content: content,
+	}, nil
+
+}
+
+func (dec *tomlDecoder) createStringScalar(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := string(tomlNode.Data)
+	return createScalarNode(content, content), nil
+}
+
+func (dec *tomlDecoder) createBoolScalar(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := string(tomlNode.Data)
+	return createScalarNode(content == "true", content), nil
+}
+
+func (dec *tomlDecoder) createIntegerScalar(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := string(tomlNode.Data)
+	_, num, err := parseInt64(content)
+	return createScalarNode(num, content), err
+}
+
+func (dec *tomlDecoder) createDateTimeScalar(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := string(tomlNode.Data)
+	val, err := parseDateTime(time.RFC3339, content)
+	return createScalarNode(val, content), err
+}
+
+func (dec *tomlDecoder) createFloatScalar(tomlNode *toml.Node) (*CandidateNode, error) {
+	content := string(tomlNode.Data)
+	num, err := strconv.ParseFloat(content, 64)
+	return createScalarNode(num, content), err
+}
+
+func (dec *tomlDecoder) decodeNode(tomlNode *toml.Node) (*CandidateNode, error) {
+	switch tomlNode.Kind {
+	case toml.Key, toml.String:
+		return dec.createStringScalar(tomlNode)
+	case toml.Bool:
+		return dec.createBoolScalar(tomlNode)
+	case toml.Integer:
+		return dec.createIntegerScalar(tomlNode)
+	case toml.DateTime:
+		return dec.createDateTimeScalar(tomlNode)
+	case toml.Float:
+		return dec.createFloatScalar(tomlNode)
+	case toml.Array:
+		return dec.createArray(tomlNode)
+	case toml.InlineTable:
+		return dec.createInlineTableMap(tomlNode)
+	default:
+		return nil, fmt.Errorf("unsupported type %v", tomlNode.Kind)
+	}
+
+}
+
+func (dec *tomlDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	//
+	// toml library likes to panic
+	var deferredError error
+	defer func() { //catch or finally
+		if r := recover(); r != nil {
+			var ok bool
+			deferredError, ok = r.(error)
+			if !ok {
+				deferredError = fmt.Errorf("pkg: %v", r)
+			}
+		}
+	}()
+
+	log.Debug("ok here we go")
+	var runAgainstCurrentExp = false
+	var err error
+	for runAgainstCurrentExp || dec.parser.NextExpression() {
+
+		if runAgainstCurrentExp {
+			log.Debug("running against current exp")
+		}
+
+		currentNode := dec.parser.Expression()
+
+		log.Debug("currentNode: %v ", currentNode.Kind)
+		runAgainstCurrentExp, err = dec.processTopLevelNode(currentNode)
+		if err != nil {
+			return dec.rootMap, err
+		}
+
+	}
+
+	err = dec.parser.Error()
+	if err != nil {
+		return nil, err
+	}
+
+	// must have finished
+	dec.finished = true
+
+	if len(dec.rootMap.Content) == 0 {
+		return nil, io.EOF
+	}
+
+	return dec.rootMap, deferredError
+
+}
+
+func (dec *tomlDecoder) processTopLevelNode(currentNode *toml.Node) (bool, error) {
+	var runAgainstCurrentExp bool
+	var err error
+	log.Debug("processTopLevelNode: Going to process %v state is current %v", currentNode.Kind, NodeToString(dec.rootMap))
+	if currentNode.Kind == toml.Table {
+		runAgainstCurrentExp, err = dec.processTable(currentNode)
+	} else if currentNode.Kind == toml.ArrayTable {
+		runAgainstCurrentExp, err = dec.processArrayTable(currentNode)
+	} else {
+		runAgainstCurrentExp, err = dec.decodeKeyValuesIntoMap(dec.rootMap, currentNode)
+	}
+
+	log.Debug("processTopLevelNode: DONE Processing state is now %v", NodeToString(dec.rootMap))
+	return runAgainstCurrentExp, err
+}
+
+func (dec *tomlDecoder) processTable(currentNode *toml.Node) (bool, error) {
+	log.Debug("Enter processTable")
+	fullPath := dec.getFullPath(currentNode.Child())
+	log.Debug("fullpath: %v", fullPath)
+
+	tableNodeValue := &CandidateNode{
+		Kind:    MappingNode,
+		Tag:     "!!map",
+		Content: make([]*CandidateNode, 0),
+	}
+
+	var tableValue *toml.Node
+	runAgainstCurrentExp := false
+	var err error
+	hasValue := dec.parser.NextExpression()
+	// check to see if there is any table data
+	if hasValue {
+		tableValue = dec.parser.Expression()
+		// next expression is not table data, so we are done
+		if tableValue.Kind != toml.KeyValue {
+			log.Debug("got an empty table, returning")
+			return true, nil
+		}
+
+		runAgainstCurrentExp, err = dec.decodeKeyValuesIntoMap(tableNodeValue, tableValue)
+		if err != nil && !errors.Is(io.EOF, err) {
+			return false, err
+		}
+	}
+
+	c := Context{}
+	c = c.SingleChildContext(dec.rootMap)
+	err = dec.d.DeeplyAssign(c, fullPath, tableNodeValue)
+	if err != nil {
+		return false, err
+	}
+	return runAgainstCurrentExp, nil
+}
+
+func (dec *tomlDecoder) arrayAppend(context Context, path []interface{}, rhsNode *CandidateNode) error {
+	log.Debug("arrayAppend to path: %v,%v", path, NodeToString(rhsNode))
+	rhsCandidateNode := &CandidateNode{
+		Kind:    SequenceNode,
+		Tag:     "!!seq",
+		Content: []*CandidateNode{rhsNode},
+	}
+
+	assignmentOp := &Operation{OperationType: addAssignOpType}
+
+	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := dec.d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
+func (dec *tomlDecoder) processArrayTable(currentNode *toml.Node) (bool, error) {
+	log.Debug("Entering processArrayTable")
+	fullPath := dec.getFullPath(currentNode.Child())
+	log.Debug("Fullpath: %v", fullPath)
+
+	// need to use the array append exp to add another entry to
+	// this array: fullpath += [ thing ]
+
+	hasValue := dec.parser.NextExpression()
+	if !hasValue {
+		return false, fmt.Errorf("error retrieving table %v value: %w", fullPath, dec.parser.Error())
+	}
+
+	tableNodeValue := &CandidateNode{
+		Kind: MappingNode,
+		Tag:  "!!map",
+	}
+
+	tableValue := dec.parser.Expression()
+	runAgainstCurrentExp, err := dec.decodeKeyValuesIntoMap(tableNodeValue, tableValue)
+	log.Debugf("table node err: %w", err)
+	if err != nil && !errors.Is(io.EOF, err) {
+		return false, err
+	}
+	c := Context{}
+
+	c = c.SingleChildContext(dec.rootMap)
+
+	// += function
+	err = dec.arrayAppend(c, fullPath, tableNodeValue)
+
+	return runAgainstCurrentExp, err
+}
@@ -0,0 +1,52 @@
+package yqlib
+
+import (
+	"bytes"
+	"io"
+	"net/url"
+)
+
+type uriDecoder struct {
+	reader       io.Reader
+	finished     bool
+	readAnything bool
+}
+
+func NewUriDecoder() Decoder {
+	return &uriDecoder{finished: false}
+}
+
+func (dec *uriDecoder) Init(reader io.Reader) error {
+	dec.reader = reader
+	dec.readAnything = false
+	dec.finished = false
+	return nil
+}
+
+func (dec *uriDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(dec.reader); err != nil {
+		return nil, err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+
+		// if we've read _only_ an empty string, lets return that
+		// otherwise if we've already read some bytes, and now we get
+		// an empty string, then we are done.
+		if dec.readAnything {
+			return nil, io.EOF
+		}
+	}
+	newValue, err := url.QueryUnescape(buf.String())
+	if err != nil {
+		return nil, err
+	}
+	dec.readAnything = true
+	return createStringScalarNode(newValue), nil
+}
@@ -1,100 +1,96 @@
+//go:build !yq_noxml
+
 package yqlib

 import (
 	"encoding/xml"
+	"errors"
 	"fmt"
 	"io"
+	"regexp"
 	"strings"
 	"unicode"

 	"golang.org/x/net/html/charset"
-	yaml "gopkg.in/yaml.v3"
 )

-type InputFormat uint
-
-const (
-	YamlInputFormat = 1 << iota
-	XmlInputFormat
-)
-
-func InputFormatFromString(format string) (InputFormat, error) {
-	switch format {
-	case "yaml", "y":
-		return YamlInputFormat, nil
-	case "xml", "x":
-		return XmlInputFormat, nil
-	default:
-		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml]", format)
-	}
-}
-
 type xmlDecoder struct {
-	reader          io.Reader
-	attributePrefix string
-	contentName     string
-	finished        bool
+	reader       io.Reader
+	readAnything bool
+	finished     bool
+	prefs        XmlPreferences
 }

-func NewXmlDecoder(attributePrefix string, contentName string) Decoder {
-	if contentName == "" {
-		contentName = "content"
+func NewXMLDecoder(prefs XmlPreferences) Decoder {
+	return &xmlDecoder{
+		finished: false,
+		prefs:    prefs,
 	}
-	return &xmlDecoder{attributePrefix: attributePrefix, contentName: contentName, finished: false}
 }

-func (dec *xmlDecoder) Init(reader io.Reader) {
+func (dec *xmlDecoder) Init(reader io.Reader) error {
 	dec.reader = reader
+	dec.readAnything = false
 	dec.finished = false
+	return nil
 }

-func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
-	yamlNode := &yaml.Node{Kind: yaml.SequenceNode}
+func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*CandidateNode, error) {
+	yamlNode := &CandidateNode{Kind: SequenceNode, Tag: "!!seq"}
 	for _, child := range nodes {
 		yamlChild, err := dec.convertToYamlNode(child)
 		if err != nil {
 			return nil, err
 		}
-		yamlNode.Content = append(yamlNode.Content, yamlChild)
+		yamlNode.AddChild(yamlChild)
 	}

 	return yamlNode, nil
 }

+var decoderCommentPrefix = regexp.MustCompile(`(^|\n)([[:alpha:]])`)
+
 func (dec *xmlDecoder) processComment(c string) string {
 	if c == "" {
 		return ""
 	}
-	return "#" + strings.TrimRight(c, " ")
+	//need to replace "cat " with "# cat"
+	// "\ncat\n" with "\n cat\n"
+	// ensure non-empty comments starting with newline have a space in front
+
+	replacement := decoderCommentPrefix.ReplaceAllString(c, "$1 $2")
+	replacement = "#" + strings.ReplaceAll(strings.TrimRight(replacement, " "), "\n", "\n#")
+	return replacement
 }

-func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
-	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
-	yamlNode := &yaml.Node{Kind: yaml.MappingNode}
+func (dec *xmlDecoder) createMap(n *xmlNode) (*CandidateNode, error) {
+	log.Debug("createMap: headC: %v, lineC: %v, footC: %v", n.HeadComment, n.LineComment, n.FootComment)
+	yamlNode := &CandidateNode{Kind: MappingNode, Tag: "!!map"}

 	if len(n.Data) > 0 {
-		label := dec.contentName
+		log.Debugf("creating content node for map: %v", dec.prefs.ContentName)
+		label := dec.prefs.ContentName
 		labelNode := createScalarNode(label, label)
 		labelNode.HeadComment = dec.processComment(n.HeadComment)
+		labelNode.LineComment = dec.processComment(n.LineComment)
 		labelNode.FootComment = dec.processComment(n.FootComment)
-		yamlNode.Content = append(yamlNode.Content, labelNode, createScalarNode(n.Data, n.Data))
+		yamlNode.AddKeyValueChild(labelNode, dec.createValueNodeFromData(n.Data))
 	}

 	for i, keyValuePair := range n.Children {
 		label := keyValuePair.K
 		children := keyValuePair.V
 		labelNode := createScalarNode(label, label)
-		var valueNode *yaml.Node
+		var valueNode *CandidateNode
 		var err error

 		if i == 0 {
+			log.Debugf("head comment here")
 			labelNode.HeadComment = dec.processComment(n.HeadComment)

 		}
-
-		// if i == len(n.Children)-1 {
+		log.Debugf("label=%v, i=%v, keyValuePair.FootComment: %v", label, i, keyValuePair.FootComment)
 		labelNode.FootComment = dec.processComment(keyValuePair.FootComment)
-		// }

 		log.Debug("len of children in %v is %v", label, len(children))
 		if len(children) > 1 {
@@ -107,53 +103,92 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 			// if the value is a scalar, the head comment of the scalar needs to go on the key?
 			// add tests for <z/> as well as multiple <ds> of inputXmlWithComments > yaml
 			if len(children[0].Children) == 0 && children[0].HeadComment != "" {
-				labelNode.HeadComment = labelNode.HeadComment + "\n" + strings.TrimSpace(children[0].HeadComment)
-				children[0].HeadComment = ""
+				if len(children[0].Data) > 0 {
+
+					log.Debug("scalar comment hack, currentlabel [%v]", labelNode.HeadComment)
+					labelNode.HeadComment = joinComments([]string{labelNode.HeadComment, strings.TrimSpace(children[0].HeadComment)}, "\n")
+					children[0].HeadComment = ""
+				} else {
+					// child is null, put the headComment as a linecomment for reasons
+					children[0].LineComment = children[0].HeadComment
+					children[0].HeadComment = ""
+				}
 			}
 			valueNode, err = dec.convertToYamlNode(children[0])
 			if err != nil {
 				return nil, err
 			}
 		}
-		yamlNode.Content = append(yamlNode.Content, labelNode, valueNode)
+		yamlNode.AddKeyValueChild(labelNode, valueNode)
 	}

 	return yamlNode, nil
 }

-func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
+func (dec *xmlDecoder) createValueNodeFromData(values []string) *CandidateNode {
+	switch len(values) {
+	case 0:
+		return createScalarNode(nil, "")
+	case 1:
+		return createScalarNode(values[0], values[0])
+	default:
+		content := make([]*CandidateNode, 0)
+		for _, value := range values {
+			content = append(content, createScalarNode(value, value))
+		}
+		return &CandidateNode{
+			Kind:    SequenceNode,
+			Tag:     "!!seq",
+			Content: content,
+		}
+	}
+}
+
+func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*CandidateNode, error) {
 	if len(n.Children) > 0 {
 		return dec.createMap(n)
 	}
-	scalar := createScalarNode(n.Data, n.Data)
-	log.Debug("scalar headC: %v, footC: %v", n.HeadComment, n.FootComment)
+
+	scalar := dec.createValueNodeFromData(n.Data)
+
+	log.Debug("scalar (%v), headC: %v, lineC: %v, footC: %v", scalar.Tag, n.HeadComment, n.LineComment, n.FootComment)
 	scalar.HeadComment = dec.processComment(n.HeadComment)
 	scalar.LineComment = dec.processComment(n.LineComment)
+	if scalar.Tag == "!!seq" {
+		scalar.Content[0].HeadComment = scalar.LineComment
+		scalar.LineComment = ""
+	}
+
 	scalar.FootComment = dec.processComment(n.FootComment)

 	return scalar, nil
 }

-func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+func (dec *xmlDecoder) Decode() (*CandidateNode, error) {
 	if dec.finished {
-		return io.EOF
+		return nil, io.EOF
 	}
 	root := &xmlNode{}
 	// cant use xj - it doesn't keep map order.
-	err := dec.decodeXml(root)
+	err := dec.decodeXML(root)

 	if err != nil {
-		return err
+		return nil, err
 	}
 	firstNode, err := dec.convertToYamlNode(root)

 	if err != nil {
-		return err
+		return nil, err
+	} else if firstNode.Tag == "!!null" {
+		dec.finished = true
+		if dec.readAnything {
+			return nil, io.EOF
+		}
 	}
-	rootYamlNode.Kind = yaml.DocumentNode
-	rootYamlNode.Content = []*yaml.Node{firstNode}
+	dec.readAnything = true
 	dec.finished = true
-	return nil
+
+	return firstNode, nil
 }

 type xmlNode struct {
@@ -161,7 +196,7 @@ type xmlNode struct {
 	HeadComment string
 	FootComment string
 	LineComment string
-	Data        string
+	Data        []string
 }

 type xmlChildrenKv struct {
@@ -200,20 +235,32 @@ type element struct {
 // this code is heavily based on https://github.com/basgys/goxml2json
 // main changes are to decode into a structure that preserves the original order
 // of the map keys.
-func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
+func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 	xmlDec := xml.NewDecoder(dec.reader)
-
+	xmlDec.Strict = dec.prefs.StrictMode
 	// That will convert the charset if the provided XML is non-UTF-8
 	xmlDec.CharsetReader = charset.NewReaderLabel

+	started := false
+
 	// Create first element from the root node
 	elem := &element{
 		parent: nil,
 		n:      root,
 	}

+	getToken := func() (xml.Token, error) {
+		if dec.prefs.UseRawToken {
+			return xmlDec.RawToken()
+		}
+		return xmlDec.Token()
+	}
+
 	for {
-		t, _ := xmlDec.Token()
+		t, e := getToken()
+		if e != nil && !errors.Is(e, io.EOF) {
+			return e
+		}
 		if t == nil {
 			break
 		}
@@ -231,16 +278,31 @@ func (dec *xmlDecoder) decodeXml(root *xmlNode) error {

 			// Extract attributes as children
 			for _, a := range se.Attr {
-				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
+				if dec.prefs.KeepNamespace {
+					if a.Name.Space != "" {
+						a.Name.Local = a.Name.Space + ":" + a.Name.Local
+					}
+				}
+				elem.n.AddChild(dec.prefs.AttributePrefix+a.Name.Local, &xmlNode{Data: []string{a.Value}})
 			}
 		case xml.CharData:
+
 			// Extract XML data (if any)
-			elem.n.Data = trimNonGraphic(string(se))
-			if elem.n.Data != "" {
+			newBit := trimNonGraphic(string(se))
+			if !started && len(newBit) > 0 {
+				return fmt.Errorf("invalid XML: Encountered chardata [%v] outside of XML node", newBit)
+			}
+
+			if len(newBit) > 0 {
+				elem.n.Data = append(elem.n.Data, newBit)
 				elem.state = "chardata"
 				log.Debug("chardata [%v] for %v", elem.n.Data, elem.label)
 			}
 		case xml.EndElement:
+			if elem == nil {
+				log.Debug("no element, probably bad xml")
+				continue
+			}
 			log.Debug("end element %v", elem.label)
 			elem.state = "finished"
 			// And add it to its parent list
@@ -258,13 +320,22 @@ func (dec *xmlDecoder) decodeXml(root *xmlNode) error {

 			} else if elem.state == "chardata" {
 				log.Debug("got a line comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
-				elem.n.LineComment = joinFilter([]string{elem.n.LineComment, commentStr})
+				elem.n.LineComment = joinComments([]string{elem.n.LineComment, commentStr}, " ")
 			} else {
 				log.Debug("got a head comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
-				elem.n.HeadComment = joinFilter([]string{elem.n.HeadComment, commentStr})
+				elem.n.HeadComment = joinComments([]string{elem.n.HeadComment, commentStr}, " ")
 			}

+		case xml.ProcInst:
+			if !dec.prefs.SkipProcInst {
+				elem.n.AddChild(dec.prefs.ProcInstPrefix+se.Target, &xmlNode{Data: []string{string(se.Inst)}})
+			}
+		case xml.Directive:
+			if !dec.prefs.SkipDirectives {
+				elem.n.AddChild(dec.prefs.DirectiveName, &xmlNode{Data: []string{string(se)}})
+			}
 		}
+		started = true
 	}

 	return nil
@@ -276,22 +347,28 @@ func applyFootComment(elem *element, commentStr string) {
 	if len(elem.n.Children) > 0 {
 		lastChildIndex := len(elem.n.Children) - 1
 		childKv := elem.n.Children[lastChildIndex]
-		log.Debug("got a foot comment for %v: [%v]", childKv.K, commentStr)
-		childKv.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+		log.Debug("got a foot comment, putting on last child for %v: [%v]", childKv.K, commentStr)
+		// if it's an array of scalars, put the foot comment on the scalar itself
+		if len(childKv.V) > 0 && len(childKv.V[0].Children) == 0 {
+			nodeToUpdate := childKv.V[len(childKv.V)-1]
+			nodeToUpdate.FootComment = joinComments([]string{nodeToUpdate.FootComment, commentStr}, " ")
+		} else {
+			childKv.FootComment = joinComments([]string{elem.n.FootComment, commentStr}, " ")
+		}
 	} else {
 		log.Debug("got a foot comment for %v: [%v]", elem.label, commentStr)
-		elem.n.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+		elem.n.FootComment = joinComments([]string{elem.n.FootComment, commentStr}, " ")
 	}
 }

-func joinFilter(rawStrings []string) string {
+func joinComments(rawStrings []string, joinStr string) string {
 	stringsToJoin := make([]string, 0)
 	for _, str := range rawStrings {
 		if str != "" {
 			stringsToJoin = append(stringsToJoin, str)
 		}
 	}
-	return strings.Join(stringsToJoin, " ")
+	return strings.Join(stringsToJoin, joinStr)
 }

 // trimNonGraphic returns a slice of the string s, with all leading and trailing
@@ -1,28 +1,157 @@
 package yqlib

 import (
+	"bufio"
+	"bytes"
+	"errors"
 	"io"
+	"regexp"
+	"strings"

 	yaml "gopkg.in/yaml.v3"
 )

-type Decoder interface {
-	Init(reader io.Reader)
-	Decode(node *yaml.Node) error
-}
-
 type yamlDecoder struct {
 	decoder yaml.Decoder
+
+	prefs YamlPreferences
+
+	// work around of various parsing issues by yaml.v3 with document headers
+	leadingContent string
+	bufferRead     bytes.Buffer
+
+	// anchor map persists over multiple documents for convenience.
+	anchorMap map[string]*CandidateNode
+
+	readAnything  bool
+	firstFile     bool
+	documentIndex uint
 }

-func NewYamlDecoder() Decoder {
-	return &yamlDecoder{}
+func NewYamlDecoder(prefs YamlPreferences) Decoder {
+	return &yamlDecoder{prefs: prefs, firstFile: true}
 }

-func (dec *yamlDecoder) Init(reader io.Reader) {
-	dec.decoder = *yaml.NewDecoder(reader)
+func (dec *yamlDecoder) processReadStream(reader *bufio.Reader) (io.Reader, string, error) {
+	var commentLineRegEx = regexp.MustCompile(`^\s*#`)
+	var yamlDirectiveLineRegEx = regexp.MustCompile(`^\s*%YA`)
+	var sb strings.Builder
+	for {
+		peekBytes, err := reader.Peek(4)
+		if errors.Is(err, io.EOF) {
+			// EOF are handled else where..
+			return reader, sb.String(), nil
+		} else if err != nil {
+			return reader, sb.String(), err
+		} else if string(peekBytes[0]) == "\n" {
+			_, err := reader.ReadString('\n')
+			sb.WriteString("\n")
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else if string(peekBytes) == "--- " {
+			_, err := reader.ReadString(' ')
+			sb.WriteString("$yqDocSeparator$\n")
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else if string(peekBytes) == "---\n" {
+			_, err := reader.ReadString('\n')
+			sb.WriteString("$yqDocSeparator$\n")
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else if commentLineRegEx.MatchString(string(peekBytes)) || yamlDirectiveLineRegEx.MatchString(string(peekBytes)) {
+			line, err := reader.ReadString('\n')
+			sb.WriteString(line)
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else {
+			return reader, sb.String(), nil
+		}
+	}
 }

-func (dec *yamlDecoder) Decode(rootYamlNode *yaml.Node) error {
-	return dec.decoder.Decode(rootYamlNode)
+func (dec *yamlDecoder) Init(reader io.Reader) error {
+	readerToUse := reader
+	leadingContent := ""
+	dec.bufferRead = bytes.Buffer{}
+	var err error
+	// if we 'evaluating together' - we only process the leading content
+	// of the first file - this ensures comments from subsequent files are
+	// merged together correctly.
+	if dec.prefs.LeadingContentPreProcessing && (!dec.prefs.EvaluateTogether || dec.firstFile) {
+		readerToUse, leadingContent, err = dec.processReadStream(bufio.NewReader(reader))
+		if err != nil {
+			return err
+		}
+	} else if !dec.prefs.LeadingContentPreProcessing {
+		// if we're not process the leading content
+		// keep a copy of what we've read. This is incase its a
+		// doc with only comments - the decoder will return nothing
+		// then we can read the comments from bufferRead
+		readerToUse = io.TeeReader(reader, &dec.bufferRead)
+	}
+	dec.leadingContent = leadingContent
+	dec.readAnything = false
+	dec.decoder = *yaml.NewDecoder(readerToUse)
+	dec.firstFile = false
+	dec.documentIndex = 0
+	dec.anchorMap = make(map[string]*CandidateNode)
+	return nil
+}
+
+func (dec *yamlDecoder) Decode() (*CandidateNode, error) {
+	var yamlNode yaml.Node
+	err := dec.decoder.Decode(&yamlNode)
+
+	if errors.Is(err, io.EOF) && dec.leadingContent != "" && !dec.readAnything {
+		// force returning an empty node with a comment.
+		dec.readAnything = true
+		return dec.blankNodeWithComment(), nil
+	} else if errors.Is(err, io.EOF) && !dec.prefs.LeadingContentPreProcessing && !dec.readAnything {
+		// didn't find any yaml,
+		// check the tee buffer, maybe there were comments
+		dec.readAnything = true
+		dec.leadingContent = dec.bufferRead.String()
+		if dec.leadingContent != "" {
+			return dec.blankNodeWithComment(), nil
+		}
+		return nil, err
+	} else if err != nil {
+		return nil, err
+	}
+
+	candidateNode := CandidateNode{document: dec.documentIndex}
+	// don't bother with the DocumentNode
+	err = candidateNode.UnmarshalYAML(yamlNode.Content[0], dec.anchorMap)
+	if err != nil {
+		return nil, err
+	}
+
+	candidateNode.HeadComment = yamlNode.HeadComment + candidateNode.HeadComment
+	candidateNode.FootComment = yamlNode.FootComment + candidateNode.FootComment
+
+	if dec.leadingContent != "" {
+		candidateNode.LeadingContent = dec.leadingContent
+		dec.leadingContent = ""
+	}
+	dec.readAnything = true
+	dec.documentIndex++
+	return &candidateNode, nil
+}
+
+func (dec *yamlDecoder) blankNodeWithComment() *CandidateNode {
+	node := createScalarNode(nil, "")
+	node.LeadingContent = dec.leadingContent
+	return node
 }
@@ -4,31 +4,10 @@ Add behaves differently according to the type of the LHS:
 * arrays: concatenate
 * number scalars: arithmetic addition
 * string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)

-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.

-## Concatenate and assign arrays
-Given a sample.yml file of:
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-```
-then
-```bash
-yq eval '.a.b += ["cow"]' sample.yml
-```
-will output
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-    - cow
-```

 ## Concatenate arrays
 Given a sample.yml file of:
@@ -42,7 +21,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a + .b' sample.yml
+yq '.a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -52,6 +31,28 @@ will output
 - 4
 ```

+## Concatenate to existing array
+Note that the styling of `a` is kept.
+
+Given a sample.yml file of:
+```yaml
+a: [1,2]
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: [1, 2, 3, 4]
+b:
+  - 3
+  - 4
+```
+
 ## Concatenate null to array
 Given a sample.yml file of:
 ```yaml
@@ -61,7 +62,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + null' sample.yml
+yq '.a + null' sample.yml
 ```
 will output
 ```yaml
@@ -69,6 +70,39 @@ will output
 - 2
 ```

+## Append to existing array
+Note that the styling is copied from existing array elements
+
+Given a sample.yml file of:
+```yaml
+a: ['dog']
+```
+then
+```bash
+yq '.a += "cat"' sample.yml
+```
+will output
+```yaml
+a: ['dog', 'cat']
+```
+
+## Prepend to existing array
+Given a sample.yml file of:
+```yaml
+a:
+  - dog
+```
+then
+```bash
+yq '.a = ["cat"] + .a' sample.yml
+```
+will output
+```yaml
+a:
+  - cat
+  - dog
+```
+
 ## Add new object to array
 Given a sample.yml file of:
 ```yaml
@@ -77,7 +111,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
+yq '.a + {"cat": "meow"}' sample.yml
 ```
 will output
 ```yaml
@@ -85,76 +119,6 @@ will output
 - cat: meow
 ```

-## Add string to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + "hello"' sample.yml
-```
-will output
-```yaml
- 1
- 2
- hello
-```
-
-## Append to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
-## Append another array using +=
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a += .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
 ## Relative append
 Given a sample.yml file of:
 ```yaml
@@ -169,7 +133,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
+yq '.a[].b += ["mouse"]' sample.yml
 ```
 will output
 ```yaml
@@ -182,7 +146,9 @@ a:
    b:
      - dog
      - mouse
-  a3: {b: [mouse]}
+  a3:
+    b:
+      - mouse
 ```

 ## String concatenation
@@ -193,7 +159,7 @@ b: meow
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a += .b' sample.yml
 ```
 will output
 ```yaml
@@ -211,7 +177,7 @@ b: 4.9
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +195,7 @@ b: 4
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +211,7 @@ b: 5
 ```
 then
 ```bash
-yq eval '.[] += 1' sample.yml
+yq '.[] += 1' sample.yml
 ```
 will output
 ```yaml
@@ -253,15 +219,118 @@ a: 4
 b: 6
 ```

+## Date addition
+You can add durations to dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+
+Given a sample.yml file of:
+```yaml
+a: 2021-01-01T00:00:00Z
+```
+then
+```bash
+yq '.a += "3h10m"' sample.yml
+```
+will output
+```yaml
+a: 2021-01-01T03:10:00Z
+```
+
+## Date addition - custom format
+You can add durations to dates. See [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST", .a += "3h1m")' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 6:00AM GMT
+```
+
 ## Add to null
 Adding to null simply returns the rhs

 Running
 ```bash
-yq eval --null-input 'null + "cat"'
+yq --null-input 'null + "cat"'
 ```
 will output
 ```yaml
 cat
 ```

+## Add maps to shallow merge
+Adding objects together shallow merges them. Use `*` to deeply merge.
+
+Given a sample.yml file of:
+```yaml
+a:
+  thing:
+    name: Astuff
+    value: x
+  a1: cool
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a:
+  thing:
+    name: Bstuff
+    legs: 3
+  a1: cool
+  b1: neat
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+
+## Custom types: that are really strings
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse cat
+b: !goat _meow
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse cat_meow
+b: !goat _meow
+```
+
+## Custom types: that are really numbers
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse 1.2
+b: !goat 2.3
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse 3.5
+b: !goat 2.3
+```
+
@@ -9,7 +9,7 @@ a: bridge
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +23,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +37,7 @@ a: ~
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +51,7 @@ a: false
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -66,10 +66,43 @@ b: cat
 ```
 then
 ```bash
-yq eval '.a // .b' sample.yml
+yq '.a // .b' sample.yml
 ```
 will output
 ```yaml
 cat
 ```

+## Update or create - entity exists
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+a: 1
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+a: 2
+```
+
+## Update or create - entity does not exist
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+b: camel
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+b: camel
+a: 1
+```
+
@@ -25,7 +25,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -55,7 +55,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +87,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -103,7 +103,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq eval '.a | anchor' sample.yml
+yq '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -117,7 +117,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a anchor = "foobar"' sample.yml
+yq '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +132,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a anchor |= .b' sample.yml
+yq '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +148,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq eval '.a | alias' sample.yml
+yq '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +163,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = "meow"' sample.yml
+yq '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -179,7 +179,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = ""' sample.yml
+yq '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -196,7 +196,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a alias |= .f' sample.yml
+yq '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -213,7 +213,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +229,7 @@ a: mike
 ```
 then
 ```bash
-yq eval 'explode(.a)' sample.yml
+yq 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +245,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -278,7 +278,7 @@ foobar:
 ```
 then
 ```bash
-yq eval 'explode(.)' sample.yml
+yq 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -302,7 +302,7 @@ foobar:
 ```

 ## Dereference and update a field
-`Use explode with multiply to dereference an object
+Use explode with multiply to dereference an object

 Given a sample.yml file of:
 ```yaml
@@ -317,7 +317,7 @@ thingTwo:
 ```
 then
 ```bash
-yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
+yq '.thingOne |= explode(.) * {"value": false}' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,28 @@
+# Array to Map
+
+Use this operator to convert an array to..a map. The indices are used as map keys, null values in the array are skipped over.
+
+Behind the scenes, this is implemented using reduce:
+
+```
+(.[] | select(. != null) ) as $i ireduce({}; .[$i | key] = $i)
+```
+
+## Simple example
+Given a sample.yml file of:
+```yaml
+cool:
+  - null
+  - null
+  - hello
+```
+then
+```bash
+yq '.cool |= array_to_map' sample.yml
+```
+will output
+```yaml
+cool:
+  2: hello
+```
+
@@ -3,14 +3,19 @@
 This operator is used to update node values. It can be used in either the:

 ### plain form: `=`
-Which will assign the LHS node values to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.
+Which will set the LHS node values equal to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.

 ### relative form: `|=`
-This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
+This will do a similar thing to the plain form, but the RHS expression is run with _each LHS node as context_. This is useful for updating values based on old values, e.g. increment.
+
+
+### Flags
+- `c` clobber custom tags
+
 ## Create yaml file
 Running
 ```bash
-yq eval --null-input '.a.b = "cat" | .x = "frog"'
+yq --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -28,7 +33,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a |= .b' sample.yml
+yq '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +50,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] |= . * 2' sample.yml
+yq '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -84,7 +89,7 @@ b: sibling
 ```
 then
 ```bash
-yq eval '.a = .b' sample.yml
+yq '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -101,13 +106,13 @@ c: fieldC
 ```
 then
 ```bash
-yq eval '(.a, .c) = "potatoe"' sample.yml
+yq '(.a, .c) = "potato"' sample.yml
 ```
 will output
 ```yaml
-a: potatoe
+a: potato
 b: fieldB
-c: potatoe
+c: potato
 ```

 ## Update string value
@@ -118,7 +123,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b = "frog"' sample.yml
+yq '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -136,7 +141,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b |= "frog"' sample.yml
+yq '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -145,7 +150,7 @@ a:
 ```

 ## Update deeply selected results
-Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.
+Note that the LHS is wrapped in brackets! This is to ensure we don't first filter out the yaml and then update the snippet.

 Given a sample.yml file of:
 ```yaml
@@ -155,7 +160,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -173,7 +178,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -189,15 +194,16 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b |= "bogs"' sample.yml
+yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: bogs}}
+a:
+  b: bogs
 ```

 ## Update node value that has an anchor
-Anchor will remaple
+Anchor will remain

 Given a sample.yml file of:
 ```yaml
@@ -205,7 +211,7 @@ a: &cool cat
 ```
 then
 ```bash
-yq eval '.a = "dog"' sample.yml
+yq '.a = "dog"' sample.yml
 ```
 will output
 ```yaml
@@ -219,10 +225,46 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b.[0] |= "bogs"' sample.yml
+yq '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: [bogs]}}
+a:
+  b:
+    - bogs
+```
+
+## Custom types are maintained by default
+Given a sample.yml file of:
+```yaml
+a: !cat meow
+b: !dog woof
+```
+then
+```bash
+yq '.a = .b' sample.yml
+```
+will output
+```yaml
+a: !cat woof
+b: !dog woof
+```
+
+## Custom types: clobber
+Use the `c` option to clobber custom tags
+
+Given a sample.yml file of:
+```yaml
+a: !cat meow
+b: !dog woof
+```
+then
+```bash
+yq '.a =c .b' sample.yml
+```
+will output
+```yaml
+a: !dog woof
+b: !dog woof
 ```

@@ -4,26 +4,50 @@ The `or` and `and` operators take two parameters and return a boolean result.

 `not` flips a boolean from true to false, or vice versa. 

-`any` will return `true` if there are any `true` values in a array sequence, and `all` will return true if _all_ elements in an array are true.
+`any` will return `true` if there are any `true` values in an array sequence, and `all` will return true if _all_ elements in an array are true.

 `any_c(condition)` and `all_c(condition)` are like `any` and `all` but they take a condition expression that is used against each element to determine if it's `true`. Note: in `jq` you can simply pass a condition to `any` or `all` and it simply works - `yq` isn't that clever..yet

 These are most commonly used with the `select` operator to filter particular nodes.

+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+
 ## `or` example
 Running
 ```bash
-yq eval --null-input 'true or false'
+yq --null-input 'true or false'
 ```
 will output
 ```yaml
 true
 ```

+## "yes" and "no" are strings
+In the yaml 1.2 standard, support for yes/no as booleans was dropped - they are now considered strings. See '10.2.1.2. Boolean' in https://yaml.org/spec/1.2.2/
+
+Given a sample.yml file of:
+```yaml
+- yes
+- no
+```
+then
+```bash
+yq '.[] | tag' sample.yml
+```
+will output
+```yaml
+!!str
+!!str
+```
+
 ## `and` example
 Running
 ```bash
-yq eval --null-input 'true and false'
+yq --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -42,7 +66,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +84,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +98,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +117,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
+yq '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +133,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -123,7 +147,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -142,7 +166,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
+yq '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -153,7 +177,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq eval --null-input 'true | not'
+yq --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -163,7 +187,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq eval --null-input 'false | not'
+yq --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -173,7 +197,7 @@ true
 ## String values considered to be true
 Running
 ```bash
-yq eval --null-input '"cat" | not'
+yq --null-input '"cat" | not'
 ```
 will output
 ```yaml
@@ -183,7 +207,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq eval --null-input '"" | not'
+yq --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -193,7 +217,7 @@ false
 ## Numbers are considered to be true
 Running
 ```bash
-yq eval --null-input '1 | not'
+yq --null-input '1 | not'
 ```
 will output
 ```yaml
@@ -203,7 +227,7 @@ false
 ## Zero is considered to be true
 Running
 ```bash
-yq eval --null-input '0 | not'
+yq --null-input '0 | not'
 ```
 will output
 ```yaml
@@ -213,7 +237,7 @@ false
 ## Null is considered to be false
 Running
 ```bash
-yq eval --null-input '~ | not'
+yq --null-input '~ | not'
 ```
 will output
 ```yaml
@@ -6,7 +6,7 @@ This creates an array using the expression between the square brackets.
 ## Collect empty
 Running
 ```bash
-yq eval --null-input '[]'
+yq --null-input '[]'
 ```
 will output
 ```yaml
@@ -16,7 +16,7 @@ will output
 ## Collect single
 Running
 ```bash
-yq eval --null-input '["cat"]'
+yq --null-input '["cat"]'
 ```
 will output
 ```yaml
@@ -31,7 +31,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '[.a, .b]' sample.yml
+yq '[.a, .b]' sample.yml
 ```
 will output
 ```yaml
--- a/Show More
+++ b/Show More