fixed leading content logic

1. Escaping behavior changed as a result of set-output deprecation.
-  Otherwise you'll encounter breaking changes for example "appVersion: "1.0.0"%0Aapplica..."
   where %0A is escaped newline \n but shouldn't be escaped.

2. Delimeter is required for multiline strings.
-  See here: https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
-  Delimeter must be random. UUID is a solid choice.
   I verified that /proc/sys/kernel/random/uuid does indeed exist on the yq image.

.github/workflows/codeql.yml

@@ -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@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      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@v2
+
+    # 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@v2

.github/workflows/docker-release.yml

@@ -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@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+        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 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 "${IMAGE_NAME}:latest" \
+            .
+          
+          cd github-action
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line 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}:${IMAGE_VERSION}-githubaction" \
+            -t "${IMAGE_NAME}:4-githubaction" \
+            -t "${IMAGE_NAME}:latest-githubaction" \
+            .

.github/workflows/go.yml

@@ -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 1.19
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.17
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Get dependencies
       run: |

.github/workflows/release.yml

@@ -3,15 +3,17 @@ on:
   push:
     tags:
       - 'v*'
+      - 'draft-*'
 
 jobs:
   publishGitRelease:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
         with:
-          go-version: '^1.17.5'
+          go-version: '^1.19'
+          check-latest: true
       - name: Compile man page markup
         id: gen-man-page-md
         run: |
@@ -39,72 +41,14 @@ jobs:
       - 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

.github/workflows/test-yq.yml

@@ -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@v3
       - 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

.gitignore

@@ -41,6 +41,7 @@ yq*.snap
 
 test.yml
 test*.yml
+test*.yaml
 0.yml
 1.yml
 2.yml
@@ -53,3 +54,11 @@ yq.1
 # debian pkg
 _build
 debian/files
+
+# intellij
+/.idea
+
+# vscode
+.vscode
+
+yq3

CONTRIBUTING.md

@@ -1,3 +1,5 @@
+# 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
@@ -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 advanced, 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.

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.17 as builder
+FROM golang:1.19.2 as builder
 
 WORKDIR /go/src/mikefarah/yq
 

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.17
+FROM golang:1.19.2
 
 COPY scripts/devtools.sh /opt/devtools.sh
 

README.md

@@ -1,38 +1,14 @@
 # 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, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json and xml. 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.
 
-## Notice for v4.x versions prior to 4.18.1
-Since 4.18.1, yq's 'eval/e' command is the _default_ command and no longers needs to be specified.
-
-Older versions will still need to specify 'eval/e'.
-
-Similarly, '-' is no longer required as a filename to read from STDIN (unless reading from multiple files).
-
-TLDR:
-
-Prior to 4.18.1 
-```bash
-cat file.yaml | yq e '.cool' -
-```
-
-4.18+ 
-```bash
-cat file.yaml | yq '.cool'
-```
-
-When merging multiple files together, `eval-all/ea` is still required to tell `yq` to run the expression against all the document at once.
-
 ## Quick Usage Guide
 
-
-
-
 Read a value:
 ```bash
 yq '.a.b[0].c' file.yaml
@@ -40,7 +16,7 @@ yq '.a.b[0].c' file.yaml
 
 Pipe from STDIN:
 ```bash
-cat file.yaml | yq '.a.b[0].c'
+yq '.a.b[0].c' < file.yaml
 ```
 
 Update a yaml file, inplace
@@ -60,7 +36,6 @@ Merge multiple files
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```
 
-
 Multiple updates to a yaml file
 ```bash
 yq -i '
@@ -70,14 +45,21 @@ yq -i '
 ' file.yaml
 ```
 
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+Convert JSON to YAML
+```bash
+yq -P sample.json
+```
+
+See the [documentation](https://mikefarah.gitbook.io/yq/) for more examples.
+
+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:
 
 #### Compressed via tar.gz
 ```bash
@@ -94,6 +76,13 @@ wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /
 
 For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
 
+Use VERSION=latest to always get the 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/)
 ```
@@ -142,11 +131,11 @@ 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 '.this.thing'
+docker run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 ```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq '.this.thing'
+podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 #### Run commands interactively:
@@ -172,8 +161,6 @@ 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:
@@ -197,25 +184,61 @@ 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 "${PWD}":/workdir:z
+```
+
 ### GitHub Action
 ```
   - name: Set foobar to cool
     uses: mikefarah/yq@master
     with:
       cmd: yq -i '.foo.bar = "cool"' 'config.yml'
+  - name: Get an entry with a variable that might contain dots or spaces
+    id: get_username
+    uses: mikefarah/yq@master
+    with:
+      cmd: yq '.all.children.["${{ 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
+
+### 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
@@ -238,6 +261,13 @@ choco install yq
 ```
 Supported by @chillum (https://chocolatey.org/packages/yq)
 
+and
+
+### Winget
+winget install yq
+
+https://winget.run/pkg/MikeFarah/yq
+
 ### Mac:
 Using [MacPorts](https://www.macports.org/)
 ```
@@ -271,18 +301,19 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 - 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
+- [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 inplace](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/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 properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
-- [Convert to csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
-- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
+- [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)
@@ -299,7 +330,7 @@ Usage:
 Examples:
 
 # yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
-cat myfile.yml | yq '.stuff' # outputs the data at the "stuff" node from "myfile.yml"
+yq '.stuff' < myfile.yml # outputs the data at the "stuff" node from "myfile.yml"
 
 yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 

acceptance_tests/basic.sh

@@ -3,6 +3,7 @@
 setUp() {
   rm test*.yml 2>/dev/null || true
   rm .xyz 2>/dev/null || true
+  rm instructions.txt 2>/dev/null || true
 }
 
 testBasicEvalRoundTrip() {
@@ -11,6 +12,62 @@ testBasicEvalRoundTrip() {
   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 '.')
@@ -26,7 +83,17 @@ testBasicExpressionMatchesFileName() {
 
   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"
 }
 
 testBasicGitHubAction() {
@@ -62,19 +129,30 @@ testBasicEvalAllAllFiles() {
   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 test.yml)
+  Y=$(./yq e '.' test2.yml)
   assertEquals "$Y" "$X"
 }
 
+# when the nullinput flag is used
+# dont 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 test.yml)
+  Y=$(./yq e '.' test2.yml)
   assertEquals "$Y" "$X"
 }
 
@@ -82,7 +160,7 @@ 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 test.yml)
+  Y=$(./yq e '.a' test2.yml)
   assertEquals "$Y" "$X"
 }
 
@@ -90,7 +168,7 @@ 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 test.yml)
+  Y=$(./yq e '.a' test2.yml)
   assertEquals "$Y" "$X"
 }
 
@@ -172,6 +250,40 @@ 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=$(./yq e '.z' test.yml)
@@ -219,4 +331,26 @@ EOM
   assertEquals "$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"
+}
+
+
+
 source ./scripts/shunit2

acceptance_tests/empty.sh

@@ -9,7 +9,7 @@ EOL
 
 testEmptyEval() {
   X=$(./yq e test.yml)
-  expected=$(cat test.yml)
+  expected="# comment"
   assertEquals 0 $?
   assertEquals "$expected" "$X"
 }

acceptance_tests/header-processing-off.sh

@@ -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

acceptance_tests/inputs-format.sh

@@ -3,6 +3,8 @@
 setUp() {
   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
 }
 
@@ -40,6 +42,65 @@ EOM
   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"
+}
+
+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" "$X"
+}
+
+
+
+
 testInputXml() {
   cat >test.yml <<EOL
 <cat legs="4">BiBi</cat>
@@ -58,6 +119,69 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testInputXmlNamespaces() {
+  cat >test.yml <<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=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  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>

acceptance_tests/leading-seperator.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+
+# examples where header-preprocess is required
+
 setUp() {
   rm test*.yml || true
   cat >test.yml <<EOL

acceptance_tests/output-format.sh

@@ -102,6 +102,48 @@ 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"
+}
+
+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"]}}

acceptance_tests/split-printer.sh

@@ -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

action.yml

@@ -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 }}

cmd/constant.go

@@ -1,6 +1,5 @@
 package cmd
 
-var leadingContentPreProcessing = true
 var unwrapScalar = true
 
 var writeInplace = false
@@ -8,9 +7,6 @@ var outputToJSON = false
 var outputFormat = "yaml"
 var inputFormat = "yaml"
 
-var xmlAttributePrefix = "+"
-var xmlContentName = "+content"
-
 var exitStatus = false
 var forceColor = false
 var forceNoColor = false
@@ -26,7 +22,10 @@ var prettyPrint = false
 var frontMatter = ""
 
 var splitFileExp = ""
+var splitFileExpFile = ""
 
 var completedSuccessfully = false
 
 var forceExpression = ""
+
+var expressionFile = ""

cmd/evaluate_all_command.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"errors"
-	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -47,36 +46,17 @@ 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
-	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
-
-	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
-	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
-	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
-	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
-	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
-	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
-	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
-	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
-	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
-	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
-	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
-	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
-	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
-	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
-
 	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
@@ -95,7 +75,7 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 		return err
 	}
 
-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(true)
 	if err != nil {
 		return err
 	}
@@ -109,12 +89,12 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	printer := yqlib.NewPrinter(encoder, printerWriter)
 
 	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()
@@ -126,19 +106,16 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 
-	expression, args := processArgs(pipingStdIn, args)
-	yqlib.GetLogger().Debugf("processed args: %v", args)
-
 	switch len(args) {
 	case 0:
 		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer, "")
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}
 
 	completedSuccessfully = err == nil

cmd/evalute_sequence_command.go

@@ -3,7 +3,6 @@ package cmd
 import (
 	"errors"
 	"fmt"
-	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -59,42 +58,19 @@ 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
-	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
-
-	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
-	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
-	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
-	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
-	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
-	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
-	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
-	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
-	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
-	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
-	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
-	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
-	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
-	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
-
-	// Mask for the type bits. For regular files, none will be set.
-	yqlib.GetLogger().Debug("ModeType: %v", stat.Mode()&os.ModeType)
-
-	yqlib.GetLogger().Debug("ModePerm: %v", stat.Mode()&os.ModePerm)
-
-	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
@@ -121,7 +97,7 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 
 	printer := yqlib.NewPrinter(encoder, printerWriter)
 
-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(false)
 	if err != nil {
 		return err
 	}
@@ -129,12 +105,12 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 
 	if frontMatter != "" {
 		yqlib.GetLogger().Debug("using front matter handler")
-		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()
@@ -143,18 +119,17 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 		}
 		defer frontMatterHandler.CleanUp()
 	}
-	expression, args := processArgs(pipingStdIn, args)
 
 	switch len(args) {
 	case 0:
 		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(expression), printer, "")
+			err = streamEvaluator.EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -18,10 +18,13 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 # yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
 
 # read the "stuff" node from "myfile.yml"
-cat myfile.yml | yq '.stuff' 
+yq '.stuff' < myfile.yml
 
 # update myfile.yml in place
-yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+yq -i '.stuff = "foo"' myfile.yml
+
+# print contents of sample.json as idiomatic YAML
+yq -P sample.json
 `,
 
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -44,13 +47,23 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 			if verbose {
 				backend.SetLevel(logging.DEBUG, "")
 			} else {
-				backend.SetLevel(logging.ERROR, "")
+				backend.SetLevel(logging.WARNING, "")
 			}
 
 			logging.SetBackend(backend)
 			yqlib.InitExpressionParser()
-			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
-			yqlib.XMLPreferences.ContentName = xmlContentName
+			if (inputFormat == "x" || inputFormat == "xml") &&
+				outputFormat != "x" && outputFormat != "xml" &&
+				yqlib.ConfiguredXMLPreferences.AttributePrefix == "+" {
+				yqlib.GetLogger().Warning("The default xml-attribute-prefix will change in the v4.30 to `+@` to avoid " +
+					"naming conflicts with the default content name, directive name and proc inst prefix. If you need to keep " +
+					"`+` please set that value explicityly with --xml-attribute-prefix.")
+			}
+
+			//copy preference form global setting
+			yqlib.ConfiguredYamlPreferences.UnwrapScalar = unwrapScalar
+
+			yqlib.ConfiguredYamlPreferences.PrintDocSeparators = !noDocSeparators
 		},
 	}
 
@@ -65,8 +78,15 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 	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|props|p|xml|x] parse format for input. Note that json is a subset of yaml.")
 
-	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).")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.AttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.StrictMode, "xml-strict-mode", false, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.KeepNamespace, "xml-keep-namespace", true, "enables keeping namespace after parsing attributes")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.UseRawToken, "xml-raw-token", true, "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", "+p_", "prefix for xml processing instructions (e.g. <?xml version=\"1\"?>)")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.DirectiveName, "xml-directive-name", "+directive", "name for xml directives (e.g. <!DOCTYPE thing cat>)")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipProcInst, "xml-skip-proc-inst", false, "skip over process instructions (e.g. <?xml version=\"1\"?>)")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipDirectives, "xml-skip-directives", false, "skip over directives (e.g. <!DOCTYPE thing cat>)")
 
 	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 (---)")
@@ -74,7 +94,7 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	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(&unwrapScalar, "unwrapScalar", "r", true, "unwrap scalar, print the value with no quotes, colors or comments")
 	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")
 
@@ -82,9 +102,12 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 	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().StringVarP(&forceExpression, "expression", "", "", "forcibly set the expression argument. Useful when yq argument detection thinks your expression is a file.")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")
+	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.")
+	rootCmd.PersistentFlags().StringVarP(&splitFileExpFile, "split-exp-file", "", "", "Use a file to specify the split-exp expression.")
+
+	rootCmd.PersistentFlags().StringVarP(&expressionFile, "from-file", "", "", "Load expression from specified file.")
 
 	rootCmd.AddCommand(
 		createEvaluateSequenceCommand(),

cmd/shell-completion.go

@@ -42,7 +42,7 @@ $ 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] {

cmd/utils.go

@@ -10,7 +10,7 @@ import (
 	"gopkg.in/op/go-logging.v1"
 )
 
-func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
+func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	cmd.SilenceUsage = true
 
 	fileInfo, _ := os.Stdout.Stat()
@@ -19,11 +19,17 @@ 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
@@ -31,34 +37,45 @@ 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 inplace 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 inplace 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
+	return expression, args, nil
 }
 
-func configureDecoder() (yqlib.Decoder, error) {
+func configureDecoder(evaluateTogether bool) (yqlib.Decoder, error) {
 	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
 	if err != nil {
 		return nil, err
 	}
 	switch yqlibInputFormat {
 	case yqlib.XMLInputFormat:
-		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName), nil
+		return yqlib.NewXMLDecoder(yqlib.ConfiguredXMLPreferences), nil
 	case yqlib.PropertiesInputFormat:
 		return yqlib.NewPropertiesDecoder(), nil
+	case yqlib.JsonInputFormat:
+		return yqlib.NewJSONDecoder(), nil
+	case yqlib.CSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder(','), nil
+	case yqlib.TSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder('\t'), nil
 	}
-
-	return yqlib.NewYamlDecoder(), nil
+	prefs := yqlib.ConfiguredYamlPreferences
+	prefs.EvaluateTogether = evaluateTogether
+	return yqlib.NewYamlDecoder(prefs), nil
 }
 
 func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yqlib.PrinterWriter, error) {
@@ -81,17 +98,17 @@ func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yq
 func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
 	switch format {
 	case yqlib.JSONOutputFormat:
-		return yqlib.NewJONEncoder(indent)
+		return yqlib.NewJSONEncoder(indent, colorsEnabled)
 	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder()
+		return yqlib.NewPropertiesEncoder(unwrapScalar)
 	case yqlib.CSVOutputFormat:
 		return yqlib.NewCsvEncoder(',')
 	case yqlib.TSVOutputFormat:
 		return yqlib.NewCsvEncoder('\t')
 	case yqlib.YamlOutputFormat:
-		return yqlib.NewYamlEncoder(indent, colorsEnabled, !noDocSeparators, unwrapScalar)
+		return yqlib.NewYamlEncoder(indent, colorsEnabled, yqlib.ConfiguredYamlPreferences)
 	case yqlib.XMLOutputFormat:
-		return yqlib.NewXMLEncoder(indent, xmlAttributePrefix, xmlContentName)
+		return yqlib.NewXMLEncoder(indent, yqlib.ConfiguredXMLPreferences)
 	}
 	panic("invalid encoder")
 }
@@ -116,8 +133,15 @@ func maybeFile(str string) bool {
 	return result
 }
 
-func processStdInArgs(pipingStdin bool, args []string) []string {
-	if !pipingStdin {
+func processStdInArgs(args []string) []string {
+	stat, _ := os.Stdin.Stat()
+	pipingStdin := (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
 	}
 
@@ -133,14 +157,22 @@ func processStdInArgs(pipingStdin bool, args []string) []string {
 	return append(args, "-")
 }
 
-func processArgs(pipingStdin bool, originalArgs []string) (string, []string) {
-	args := processStdInArgs(pipingStdin, originalArgs)
-	yqlib.GetLogger().Debugf("processed args: %v", args)
+func processArgs(originalArgs []string) (string, []string, error) {
 	expression := forceExpression
+	if expressionFile != "" {
+		expressionBytes, err := os.ReadFile(expressionFile)
+		if err != nil {
+			return "", nil, err
+		}
+		expression = string(expressionBytes)
+	}
+
+	args := processStdInArgs(originalArgs)
+	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
+	return expression, args, nil
 }

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.19.1"
+	Version = "4.28.2"
 
 	// 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

examples/base64.txt

@@ -0,0 +1 @@
+bXkgc2VjcmV0IGNoaWxsaSByZWNpcGUgaXMuLi4u

examples/data1.yaml

@@ -1 +1,5 @@
-cat: purrs
+volumes:
+  beehive-conf:
+    driver: local
+services:
+  - beehive

examples/data2.yaml

@@ -1,2 +1,5 @@
-c:
-  d: hamster
+# --------------------------------------------------
+# It's a test with comment
+# --------------------------------------------------
+groups:
+  - name: d

examples/mike.xml

@@ -1,14 +1,7 @@
-<!-- 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 -->
+<?xml version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<apple>
+<?coolioo version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<b>things</b>
+</apple>

examples/sample_objects.csv

@@ -0,0 +1,3 @@
+name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8

examples/small.properties

@@ -0,0 +1 @@
+this.is = a properties file

examples/small.xml

@@ -0,0 +1 @@
+<this>is some xml</this>

github-action/Dockerfile

@@ -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"]

github-action/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}"

go.mod

@@ -2,28 +2,30 @@ module github.com/mikefarah/yq/v4
 
 require (
 	github.com/a8m/envsubst v1.3.0
-	github.com/elliotchance/orderedmap v1.4.0
+	github.com/alecthomas/participle/v2 v2.0.0-beta.5
+	github.com/alecthomas/repr v0.1.1
+	github.com/dimchansky/utfbom v1.1.1
+	github.com/elliotchance/orderedmap v1.5.0
 	github.com/fatih/color v1.13.0
+	github.com/goccy/go-json v0.9.11
 	github.com/goccy/go-yaml v1.9.5
 	github.com/jinzhu/copier v0.3.5
-	github.com/magiconair/properties v1.8.5
+	github.com/magiconair/properties v1.8.6
 	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 v1.6.0
+	golang.org/x/net v0.0.0-20220708220712-1185a9018129
 	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/inconshreveable/mousetrap v1.0.1 // 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/sys v0.0.0-20220712014510-0a85c31ab51e // indirect
 	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 )
 
-go 1.17
+go 1.19

go.sum

@@ -1,796 +1,82 @@
-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=
-cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
-cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
-cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
-cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
-cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
-cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
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-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
-google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.40.1/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
-google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f h1:uF6paiQQebLeSXkrTqHqz0MXhXXS1KgF41eUdBNvxK0=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-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=

how-it-works.md

@@ -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`. 
 
@@ -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

pkg/yqlib/all_at_once_evaluator.go

@@ -8,7 +8,7 @@ import (
 
 // 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)
@@ -22,6 +22,7 @@ type allAtOnceEvaluator struct {
 }
 
 func NewAllAtOnceEvaluator() Evaluator {
+	InitExpressionParser()
 	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
 }
 
@@ -45,21 +46,16 @@ 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
@@ -74,11 +70,9 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 			Filename:       "",
 			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
 			FileIndex:      0,
-			LeadingContent: firstFileLeadingContent,
+			LeadingContent: "",
 		}
 		allDocuments.PushBack(candidateNode)
-	} else {
-		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
 	}
 
 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)

pkg/yqlib/all_at_once_evaluator_test.go

@@ -31,7 +31,6 @@ var evaluateNodesScenario = []expressionScenario{
 }
 
 func TestAllAtOnceEvaluateNodes(t *testing.T) {
-	InitExpressionParser()
 	var evaluator = NewAllAtOnceEvaluator()
 	for _, tt := range evaluateNodesScenario {
 		node := test.ParseData(tt.document)

pkg/yqlib/candidate_node.go

@@ -14,14 +14,15 @@ type CandidateNode struct {
 	Parent *CandidateNode // parent node
 	Key    *yaml.Node     // node key, if this is a value from a map (or index in an array)
 
-	LeadingContent string
+	LeadingContent  string
+	TrailingContent string
 
 	Path      []interface{} /// the path we took to get to this node
 	Document  uint          // the document index of this node
 	Filename  string
 	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
 }
@@ -96,6 +97,13 @@ func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
 	}
 }
 
+func (n *CandidateNode) CreateReplacementWithDocWrappers(node *yaml.Node) *CandidateNode {
+	replacement := n.CreateReplacement(node)
+	replacement.LeadingContent = n.LeadingContent
+	replacement.TrailingContent = n.TrailingContent
+	return replacement
+}
+
 func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
 	if path == nil {
 		newPath := make([]interface{}, len(n.Path))
@@ -116,15 +124,26 @@ func (n *CandidateNode) Copy() (*CandidateNode, error) {
 	if err != nil {
 		return nil, err
 	}
+	clone.Node = deepClone(n.Node)
 	return clone, nil
 }
 
 // updates this candidate from the given candidate node
 func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
 
-	n.UpdateAttributesFrom(other, prefs)
-	n.Node.Content = other.Node.Content
+	// if this is an empty map or empty array, use the style of other node.
+	if (n.Node.Kind != yaml.ScalarNode && len(n.Node.Content) == 0) ||
+		// if the tag has changed (e.g. from str to bool)
+		(guessTagFromCustomType(n.Node) != guessTagFromCustomType(other.Node)) {
+		n.Node.Style = other.Node.Style
+	}
+
+	n.Node.Content = deepCloneContent(other.Node.Content)
+	n.Node.Kind = other.Node.Kind
 	n.Node.Value = other.Node.Value
+
+	n.UpdateAttributesFrom(other, prefs)
+
 }
 
 func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
@@ -138,7 +157,7 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	n.Node.Kind = other.Node.Kind
 
 	// don't clobber custom tags...
-	if strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+	if prefs.ClobberCustomTags || strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
 		n.Node.Tag = other.Node.Tag
 	}
 
@@ -150,16 +169,17 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes
-	//
-	// if this is an empty map or empty array, use the style of other node.
 
-	if n.Node.Style == 0 || (n.Node.Kind != yaml.ScalarNode && len(n.Node.Content) == 0) {
+	if n.Node.Style == 0 {
 		n.Node.Style = other.Node.Style
 	}
 
 	if other.Node.FootComment != "" {
 		n.Node.FootComment = other.Node.FootComment
 	}
+	if other.TrailingContent != "" {
+		n.TrailingContent = other.TrailingContent
+	}
 	if other.Node.HeadComment != "" {
 		n.Node.HeadComment = other.Node.HeadComment
 	}

pkg/yqlib/compare_operators.go

@@ -0,0 +1,133 @@
+package yqlib
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type compareTypePref struct {
+	OrEqual bool
+	Greater bool
+}
+
+func compareOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+	log.Debugf("-- compareOperator")
+	prefs := expressionNode.Operation.Preferences.(compareTypePref)
+	return crossFunction(d, context.ReadOnlyClone(), expressionNode, compare(prefs), true)
+}
+
+func compare(prefs compareTypePref) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		log.Debugf("-- compare cross function")
+		if lhs == nil && rhs == nil {
+			owner := &CandidateNode{}
+			return createBooleanCandidate(owner, prefs.OrEqual), nil
+		} else if lhs == nil {
+			log.Debugf("lhs nil, but rhs is not")
+			return createBooleanCandidate(rhs, false), nil
+		} else if rhs == nil {
+			log.Debugf("rhs nil, but rhs is not")
+			return createBooleanCandidate(lhs, false), nil
+		}
+
+		lhs.Node = unwrapDoc(lhs.Node)
+		rhs.Node = unwrapDoc(rhs.Node)
+
+		switch lhs.Node.Kind {
+		case yaml.MappingNode:
+			return nil, fmt.Errorf("maps not yet supported for comparison")
+		case yaml.SequenceNode:
+			return nil, fmt.Errorf("arrays not yet supported for comparison")
+		default:
+			if rhs.Node.Kind != yaml.ScalarNode {
+				return nil, fmt.Errorf("%v (%v) cannot be subtracted from %v", rhs.Node.Tag, rhs.Path, lhs.Node.Tag)
+			}
+			target := lhs.CreateReplacement(&yaml.Node{})
+			boolV, err := compareScalars(context, prefs, lhs.Node, rhs.Node)
+
+			return createBooleanCandidate(target, boolV), err
+		}
+	}
+}
+
+func compareDateTime(layout string, prefs compareTypePref, lhs *yaml.Node, rhs *yaml.Node) (bool, error) {
+	lhsTime, err := time.Parse(layout, lhs.Value)
+	if err != nil {
+		return false, err
+	}
+
+	rhsTime, err := time.Parse(layout, rhs.Value)
+	if err != nil {
+		return false, err
+	}
+
+	if prefs.OrEqual && lhsTime.Equal(rhsTime) {
+		return true, nil
+	}
+	if prefs.Greater {
+		return lhsTime.After(rhsTime), nil
+	}
+	return lhsTime.Before(rhsTime), nil
+
+}
+
+func compareScalars(context Context, prefs compareTypePref, lhs *yaml.Node, rhs *yaml.Node) (bool, error) {
+	lhsTag := guessTagFromCustomType(lhs)
+	rhsTag := guessTagFromCustomType(rhs)
+
+	isDateTime := lhs.Tag == "!!timestamp"
+	// if the lhs is a string, it might be a timestamp in a custom format.
+	if lhsTag == "!!str" && context.GetDateTimeLayout() != time.RFC3339 {
+		_, err := time.Parse(context.GetDateTimeLayout(), lhs.Value)
+		isDateTime = err == nil
+	}
+	if isDateTime {
+		return compareDateTime(context.GetDateTimeLayout(), prefs, lhs, rhs)
+	} else if lhsTag == "!!int" && rhsTag == "!!int" {
+		_, lhsNum, err := parseInt64(lhs.Value)
+		if err != nil {
+			return false, err
+		}
+		_, rhsNum, err := parseInt64(rhs.Value)
+		if err != nil {
+			return false, err
+		}
+
+		if prefs.OrEqual && lhsNum == rhsNum {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhsNum > rhsNum, nil
+		}
+		return lhsNum < rhsNum, nil
+	} else if (lhsTag == "!!int" || lhsTag == "!!float") && (rhsTag == "!!int" || rhsTag == "!!float") {
+		lhsNum, err := strconv.ParseFloat(lhs.Value, 64)
+		if err != nil {
+			return false, err
+		}
+		rhsNum, err := strconv.ParseFloat(rhs.Value, 64)
+		if err != nil {
+			return false, err
+		}
+		if prefs.OrEqual && lhsNum == rhsNum {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhsNum > rhsNum, nil
+		}
+		return lhsNum < rhsNum, nil
+	} else if lhsTag == "!!str" && rhsTag == "!!str" {
+		if prefs.OrEqual && lhs.Value == rhs.Value {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhs.Value > rhs.Value, nil
+		}
+		return lhs.Value < rhs.Value, nil
+	}
+
+	return false, fmt.Errorf("%v not yet supported for comparison", lhs.Tag)
+}

pkg/yqlib/compare_operators_test.go

@@ -0,0 +1,371 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var compareOperatorScenarios = []expressionScenario{
+	// ints, not equal
+	{
+		description: "Compare numbers (>)",
+		document:    "a: 5\nb: 4",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 4",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:     true,
+		description: "Compare integers (>=)",
+		document:    "a: 5\nb: 4",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 4",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// ints, equal
+	{
+		skipDoc:     true,
+		description: "Compare equal numbers (>)",
+		document:    "a: 5\nb: 5",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 5",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Compare equal numbers (>=)",
+		document:    "a: 5\nb: 5",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 5",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// floats, not equal
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 4.1",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// floats, equal
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 5.5",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 5.5",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.1\nb: 5.1",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.1\nb: 5.1",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// strings, not equal
+	{
+		description:    "Compare strings",
+		subdescription: "Compares strings by their bytecode.",
+		document:       "a: zoo\nb: apple",
+		expression:     ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// strings, equal
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// datetime, not equal
+	{
+		description:    "Compare date times",
+		subdescription: "You can compare date times. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.",
+		document:       "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression:     ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// datetime, equal
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	// both null
+	{
+		description: "Both sides are null: > is false",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Both sides are null: >= is true",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+
+	// one null
+	{
+		skipDoc:     true,
+		description: "One side is null: > is false",
+		document:    `a: 5`,
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:     true,
+		description: "One side is null: >= is false",
+		document:    `a: 5`,
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".b <= .a",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".b < .a",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+}
+
+func TestCompareOperatorScenarios(t *testing.T) {
+	for _, tt := range compareOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentOperatorScenarios(t, "compare", compareOperatorScenarios)
+}

pkg/yqlib/csv_test.go

@@ -0,0 +1,273 @@
+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 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 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:    "Parse CSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          csvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-csv-object",
+	},
+	{
+		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, processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(',')), s.description)
+	case "encode-tsv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder('\t')), s.description)
+	case "decode-csv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
+	case "decode-tsv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder('\t'), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
+	case "roundtrip-csv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewCsvEncoder(',')), 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",
+		processFormatScenario(s, NewCSVObjectDecoder(separator), NewYamlEncoder(s.indent, false, 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'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(separator))),
+	)
+}
+
+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'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		processFormatScenario(s, NewCSVObjectDecoder(separator), NewCsvEncoder(separator))),
+	)
+}
+
+func documentCSVScenario(t *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-object":
+		documentCSVDecodeObjectScenario(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)
+}

pkg/yqlib/decoder.go

@@ -3,8 +3,6 @@ package yqlib
 import (
 	"fmt"
 	"io"
-
-	yaml "gopkg.in/yaml.v3"
 )
 
 type InputFormat uint
@@ -13,11 +11,15 @@ const (
 	YamlInputFormat = 1 << iota
 	XMLInputFormat
 	PropertiesInputFormat
+	Base64InputFormat
+	JsonInputFormat
+	CSVObjectInputFormat
+	TSVObjectInputFormat
 )
 
 type Decoder interface {
-	Init(reader io.Reader)
-	Decode(node *yaml.Node) error
+	Init(reader io.Reader) error
+	Decode() (*CandidateNode, error)
 }
 
 func InputFormatFromString(format string) (InputFormat, error) {
@@ -28,6 +30,12 @@ func InputFormatFromString(format string) (InputFormat, error) {
 		return XMLInputFormat, nil
 	case "props", "p":
 		return PropertiesInputFormat, nil
+	case "json", "ndjson", "j":
+		return JsonInputFormat, nil
+	case "csv", "c":
+		return CSVObjectInputFormat, nil
+	case "tsv", "t":
+		return TSVObjectInputFormat, nil
 	default:
 		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml|props]", format)
 	}

pkg/yqlib/decoder_base64.go

@@ -0,0 +1,57 @@
+package yqlib
+
+import (
+	"bytes"
+	"encoding/base64"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+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 = 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 &CandidateNode{
+		Node: &yaml.Node{
+			Kind:  yaml.ScalarNode,
+			Tag:   "!!str",
+			Value: buf.String(),
+		},
+	}, nil
+}

pkg/yqlib/decoder_csv_object.go

@@ -0,0 +1,81 @@
+package yqlib
+
+import (
+	"encoding/csv"
+	"errors"
+	"io"
+
+	"github.com/dimchansky/utfbom"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type csvObjectDecoder struct {
+	separator rune
+	reader    csv.Reader
+	finished  bool
+}
+
+func NewCSVObjectDecoder(separator rune) Decoder {
+	return &csvObjectDecoder{separator: separator}
+}
+
+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.separator
+	dec.finished = false
+	return nil
+}
+
+func (dec *csvObjectDecoder) convertToYamlNode(content string) *yaml.Node {
+	node, err := parseSnippet(content)
+	if err != nil {
+		return createScalarNode(content, content)
+	}
+	return node
+}
+
+func (dec *csvObjectDecoder) createObject(headerRow []string, contentRow []string) *yaml.Node {
+	objectNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
+
+	for i, header := range headerRow {
+		objectNode.Content = append(
+			objectNode.Content,
+			createScalarNode(header, header),
+			dec.convertToYamlNode(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 := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
+
+	contentRow, err := dec.reader.Read()
+
+	for err == nil && len(contentRow) > 0 {
+		log.Debugf("Adding contentRow: %v", contentRow)
+		rootArray.Content = append(rootArray.Content, 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 &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{rootArray},
+		},
+	}, nil
+}

pkg/yqlib/decoder_json.go

@@ -0,0 +1,87 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/goccy/go-json"
+	yaml "gopkg.in/yaml.v3"
+)
+
+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 orderedMap
+	log.Debug("going to decode")
+	err := dec.decoder.Decode(&dataBucket)
+	if err != nil {
+		return nil, err
+	}
+	node, err := dec.convertToYamlNode(&dataBucket)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{node},
+		},
+	}, nil
+}
+
+func (dec *jsonDecoder) convertToYamlNode(data *orderedMap) (*yaml.Node, error) {
+	if data.kv == nil {
+		switch rawData := data.altVal.(type) {
+		case nil:
+			return createScalarNode(nil, "null"), nil
+		case float64, float32:
+			// json decoder returns ints as float.
+			return parseSnippet(fmt.Sprintf("%v", rawData))
+		case int, int64, int32, string, bool:
+			return createScalarNode(rawData, fmt.Sprintf("%v", rawData)), nil
+		case []*orderedMap:
+			return dec.parseArray(rawData)
+		default:
+			return nil, fmt.Errorf("unrecognised type :( %v", rawData)
+		}
+	}
+
+	var yamlMap = &yaml.Node{Kind: yaml.MappingNode}
+	for _, keyValuePair := range data.kv {
+		yamlValue, err := dec.convertToYamlNode(&keyValuePair.V)
+		if err != nil {
+			return nil, err
+		}
+		yamlMap.Content = append(yamlMap.Content, createScalarNode(keyValuePair.K, keyValuePair.K), yamlValue)
+	}
+	return yamlMap, nil
+
+}
+
+func (dec *jsonDecoder) parseArray(dataArray []*orderedMap) (*yaml.Node, error) {
+
+	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode}
+
+	for _, value := range dataArray {
+		yamlValue, err := dec.convertToYamlNode(value)
+		if err != nil {
+			return nil, err
+		}
+		yamlMap.Content = append(yamlMap.Content, yamlValue)
+	}
+	return yamlMap, nil
+}

pkg/yqlib/decoder_properties.go

@@ -2,6 +2,7 @@ package yqlib
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"strconv"
 	"strings"
@@ -20,9 +21,10 @@ func NewPropertiesDecoder() Decoder {
 	return &propertiesDecoder{d: NewDataTreeNavigator(), finished: false}
 }
 
-func (dec *propertiesDecoder) Init(reader io.Reader) {
+func (dec *propertiesDecoder) Init(reader io.Reader) error {
 	dec.reader = reader
 	dec.finished = false
+	return nil
 }
 
 func parsePropKey(key string) []interface{} {
@@ -46,15 +48,49 @@ func (dec *propertiesDecoder) processComment(c string) string {
 	return "# " + c
 }
 
-func (dec *propertiesDecoder) applyProperty(properties *properties.Properties, context Context, key string) error {
+func (dec *propertiesDecoder) applyPropertyComments(context Context, path []interface{}, comments []string) error {
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+
+	rhsCandidateNode := &CandidateNode{
+		Path: path,
+		Node: &yaml.Node{
+			Tag:         "!!str",
+			Value:       fmt.Sprintf("%v", path[len(path)-1]),
+			HeadComment: dec.processComment(strings.Join(comments, "\n")),
+			Kind:        yaml.ScalarNode,
+		},
+	}
+
+	rhsCandidateNode.Node.Tag = guessTagFromCustomType(rhsCandidateNode.Node)
+
+	rhsOp := &Operation{OperationType: valueOpType, 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 := &yaml.Node{
-		Value:       value,
-		Tag:         "!!str",
-		Kind:        yaml.ScalarNode,
-		LineComment: dec.processComment(properties.GetComment(key)),
+		Value: value,
+		Tag:   "!!str",
+		Kind:  yaml.ScalarNode,
 	}
 
 	rhsNode.Tag = guessTagFromCustomType(rhsNode)
@@ -78,23 +114,24 @@ func (dec *propertiesDecoder) applyProperty(properties *properties.Properties, c
 	return err
 }
 
-func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
+func (dec *propertiesDecoder) Decode() (*CandidateNode, error) {
 	if dec.finished {
-		return io.EOF
+		return nil, io.EOF
 	}
 	buf := new(bytes.Buffer)
 
 	if _, err := buf.ReadFrom(dec.reader); err != nil {
-		return err
+		return nil, err
 	}
 	if buf.Len() == 0 {
 		dec.finished = true
-		return io.EOF
+		return nil, io.EOF
 	}
 	properties, err := properties.LoadString(buf.String())
 	if err != nil {
-		return err
+		return nil, err
 	}
+	properties.DisableExpansion = true
 
 	rootMap := &CandidateNode{
 		Node: &yaml.Node{
@@ -107,15 +144,18 @@ func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
 	context = context.SingleChildContext(rootMap)
 
 	for _, key := range properties.Keys() {
-		if err := dec.applyProperty(properties, context, key); err != nil {
-			return err
+		if err := dec.applyProperty(context, properties, key); err != nil {
+			return nil, err
 		}
 
 	}
-
-	rootYamlNode.Kind = yaml.DocumentNode
-	rootYamlNode.Content = []*yaml.Node{rootMap.Node}
 	dec.finished = true
-	return nil
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{rootMap.Node},
+		},
+	}, nil
 
 }

pkg/yqlib/decoder_test.go

@@ -23,7 +23,7 @@ func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) s
 	writer := bufio.NewWriter(&output)
 
 	if decoder == nil {
-		decoder = NewYamlDecoder()
+		decoder = NewYamlDecoder(ConfiguredYamlPreferences)
 	}
 
 	inputs, err := readDocuments(strings.NewReader(s.input), "sample.yml", 0, decoder)

pkg/yqlib/decoder_xml.go

@@ -2,6 +2,7 @@ package yqlib
 
 import (
 	"encoding/xml"
+	"errors"
 	"io"
 	"strings"
 	"unicode"
@@ -11,26 +12,28 @@ import (
 )
 
 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}
+	yamlNode := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
 	for _, child := range nodes {
 		yamlChild, err := dec.convertToYamlNode(child)
 		if err != nil {
@@ -51,10 +54,10 @@ func (dec *xmlDecoder) processComment(c string) string {
 
 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}
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 
 	if len(n.Data) > 0 {
-		label := dec.contentName
+		label := dec.prefs.ContentName
 		labelNode := createScalarNode(label, label)
 		labelNode.HeadComment = dec.processComment(n.HeadComment)
 		labelNode.FootComment = dec.processComment(n.FootComment)
@@ -73,9 +76,7 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 
 		}
 
-		// if i == len(n.Children)-1 {
 		labelNode.FootComment = dec.processComment(keyValuePair.FootComment)
-		// }
 
 		log.Debug("len of children in %v is %v", label, len(children))
 		if len(children) > 1 {
@@ -118,29 +119,36 @@ func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
 	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)
 
 	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
-		return io.EOF
+		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 &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{firstNode},
+		},
+	}, nil
 }
 
 type xmlNode struct {
@@ -189,7 +197,7 @@ type element struct {
 // of the map keys.
 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
 
@@ -199,8 +207,18 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 		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
 		}
@@ -218,7 +236,12 @@ 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: a.Value})
 			}
 		case xml.CharData:
 			// Extract XML data (if any)
@@ -251,6 +274,14 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 				elem.n.HeadComment = joinFilter([]string{elem.n.HeadComment, commentStr})
 			}
 
+		case xml.ProcInst:
+			if !dec.prefs.SkipProcInst {
+				elem.n.AddChild(dec.prefs.ProcInstPrefix+se.Target, &xmlNode{Data: string(se.Inst)})
+			}
+		case xml.Directive:
+			if !dec.prefs.SkipDirectives {
+				elem.n.AddChild(dec.prefs.DirectiveName, &xmlNode{Data: string(se)})
+			}
 		}
 	}
 

pkg/yqlib/decoder_yaml.go

@@ -1,23 +1,114 @@
 package yqlib
 
 import (
+	"bufio"
+	"errors"
 	"io"
+	"regexp"
+	"strings"
 
 	yaml "gopkg.in/yaml.v3"
 )
 
 type yamlDecoder struct {
 	decoder yaml.Decoder
+	// work around of various parsing issues by yaml.v3 with document headers
+	prefs          YamlPreferences
+	leadingContent string
+	readAnything   bool
+	firstFile      bool
 }
 
-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 sb strings.Builder
+	for {
+		peekBytes, err := reader.Peek(3)
+		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) == "---" {
+			_, err := reader.ReadString('\n')
+			sb.WriteString("$yqDocSeperator$\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)) {
+			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 := ""
+	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
+		}
+	}
+	dec.leadingContent = leadingContent
+	dec.readAnything = false
+	dec.decoder = *yaml.NewDecoder(readerToUse)
+	dec.firstFile = false
+	return nil
+}
+
+func (dec *yamlDecoder) Decode() (*CandidateNode, error) {
+	var dataBucket yaml.Node
+
+	err := dec.decoder.Decode(&dataBucket)
+	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 err != nil {
+		return nil, err
+	}
+
+	candidateNode := &CandidateNode{
+		Node: &dataBucket,
+	}
+
+	if dec.leadingContent != "" {
+		candidateNode.LeadingContent = dec.leadingContent
+		dec.leadingContent = ""
+	}
+	// move document comments into candidate node
+	// otherwise unwrap drops them.
+	candidateNode.TrailingContent = dataBucket.FootComment
+	dataBucket.FootComment = ""
+	return candidateNode, nil
+}
+
+func (dec *yamlDecoder) blankNodeWithComment() *CandidateNode {
+	return &CandidateNode{
+		Document:       0,
+		Filename:       "",
+		Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
+		FileIndex:      0,
+		LeadingContent: dec.leadingContent,
+	}
 }

pkg/yqlib/doc/notification-snippet.md

@@ -1,6 +0,0 @@
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}

pkg/yqlib/doc/operators/add.md

@@ -9,12 +9,6 @@ Add behaves differently according to the type of the LHS:
 Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Concatenate arrays
 Given a sample.yml file of:
 ```yaml
@@ -135,7 +129,9 @@ a:
     b:
       - dog
       - mouse
-  a3: {b: [mouse]}
+  a3:
+    b:
+      - mouse
 ```
 
 ## String concatenation

pkg/yqlib/doc/operators/alternative-default-value.md

@@ -2,12 +2,6 @@
 
 This operator is used to provide alternative (or default) values when a particular expression is either null or false.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## LHS is defined
 Given a sample.yml file of:
 ```yaml
@@ -79,3 +73,36 @@ will output
 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
+```
+

pkg/yqlib/doc/operators/anchor-and-alias-operators.md

@@ -5,12 +5,6 @@ Use the `alias` and `anchor` operators to read and write yaml aliases and anchor
 `yq` supports merge aliases (like `<<: *blah`) however this is no longer in the standard yaml spec (1.2) and so `yq` will automatically add the `!!merge` tag to these nodes as it is effectively a custom tag.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Merge one map
 see https://yaml.org/type/merge.html
 

pkg/yqlib/doc/operators/assign-update.md

@@ -7,11 +7,10 @@ Which will assign the LHS node values to the RHS node values. The RHS expression
 
 ### 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.
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
 
-`yq e <exp> <file>`
-{% endhint %}
+
+### Flags
+- `c` clobber custom tags
 
 ## Create yaml file
 Running
@@ -107,13 +106,13 @@ c: fieldC
 ```
 then
 ```bash
-yq '(.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
@@ -151,7 +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
@@ -199,7 +198,8 @@ yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: bogs}}
+a:
+  b: bogs
 ```
 
 ## Update node value that has an anchor
@@ -229,6 +229,42 @@ 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: clovver
+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
 ```
 

pkg/yqlib/doc/operators/boolean-operators.md

@@ -10,11 +10,11 @@ The `or` and `and` operators take two parameters and return a boolean result.
 
 These are most commonly used with the `select` operator to filter particular nodes.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+## Related Operators
 
-`yq e <exp> <file>`
-{% endhint %}
+- 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

pkg/yqlib/doc/operators/collect-into-array.md

@@ -3,12 +3,6 @@
 This creates an array using the expression between the square brackets.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Collect empty
 Running
 ```bash

pkg/yqlib/doc/operators/column.md

@@ -0,0 +1,60 @@
+# Column
+
+Returns the column of the matching node. Starts from 1, 0 indicates there was no column data.
+
+## Returns column of _value_ node
+Given a sample.yml file of:
+```yaml
+a: cat
+b: bob
+```
+then
+```bash
+yq '.b | column' sample.yml
+```
+will output
+```yaml
+4
+```
+
+## Returns column of _key_ node
+Pipe through the key operator to get the column of the key
+
+Given a sample.yml file of:
+```yaml
+a: cat
+b: bob
+```
+then
+```bash
+yq '.b | key | column' sample.yml
+```
+will output
+```yaml
+1
+```
+
+## First column is 1
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq '.a | key | column' sample.yml
+```
+will output
+```yaml
+1
+```
+
+## No column data is 0
+Running
+```bash
+yq --null-input '{"a": "new entry"} | column'
+```
+will output
+```yaml
+0
+```
+

pkg/yqlib/doc/operators/comment-operators.md

@@ -1,6 +1,6 @@
 # Comment Operators
 
-Use these comment operators to set or retrieve comments.
+Use these comment operators to set or retrieve comments. Note that line comments on maps/arrays are actually set on the _key_ node as opposed to the _value_ (map/array). See below for examples.
 
 Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
 
@@ -10,13 +10,9 @@ This will assign the LHS nodes comments to the expression on the RHS. The RHS is
 ### relative form: `|=` 
 Similar to the plain form, however the RHS evaluates against each matching LHS node! This is useful if you want to set the comments as a relative expression of the node, for instance its value or path.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Set line comment
+Set the comment on the key node for more reliability (see below).
+
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -30,6 +26,24 @@ will output
 a: cat # single
 ```
 
+## Set line comment of a maps/arrays
+For maps and arrays, you need to set the line comment on the _key_ node. This will also work for scalars.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b: things
+```
+then
+```bash
+yq '(.a | key) line_comment="single"' sample.yml
+```
+will output
+```yaml
+a: # single
+  b: things
+```
+
 ## Use update assign to perform relative updates
 Given a sample.yml file of:
 ```yaml
@@ -46,6 +60,121 @@ a: cat # cat
 b: dog # dog
 ```
 
+## Where is the comment - map key example
+The underlying yaml parser can assign comments in a document to surprising nodes. Use an expression like this to find where you comment is. 'p' indicates the path, 'isKey' is if the node is a map key (as opposed to a map value).
+From this, you can see the 'hello-world-comment' is actually on the 'hello' key
+
+Given a sample.yml file of:
+```yaml
+hello: # hello-world-comment
+  message: world
+```
+then
+```bash
+yq '[... | {"p": path | join("."), "isKey": is_key, "hc": headComment, "lc": lineComment, "fc": footComment}]' sample.yml
+```
+will output
+```yaml
+- p: ""
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello
+  isKey: true
+  hc: ""
+  lc: hello-world-comment
+  fc: ""
+- p: hello
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello.message
+  isKey: true
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello.message
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+```
+
+## Retrieve comment - map key example
+From the previous example, we know that the comment is on the 'hello' _key_ as a lineComment
+
+Given a sample.yml file of:
+```yaml
+hello: # hello-world-comment
+  message: world
+```
+then
+```bash
+yq '.hello | key | line_comment' sample.yml
+```
+will output
+```yaml
+hello-world-comment
+```
+
+## Where is the comment - array example
+The underlying yaml parser can assign comments in a document to surprising nodes. Use an expression like this to find where you comment is. 'p' indicates the path, 'isKey' is if the node is a map key (as opposed to a map value).
+From this, you can see the 'under-name-comment' is actually on the first child
+
+Given a sample.yml file of:
+```yaml
+name:
+  # under-name-comment
+  - first-array-child
+```
+then
+```bash
+yq '[... | {"p": path | join("."), "isKey": is_key, "hc": headComment, "lc": lineComment, "fc": footComment}]' sample.yml
+```
+will output
+```yaml
+- p: ""
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name
+  isKey: true
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name.0
+  isKey: false
+  hc: under-name-comment
+  lc: ""
+  fc: ""
+```
+
+## Retrieve comment - array example
+From the previous example, we know that the comment is on the first child as a headComment
+
+Given a sample.yml file of:
+```yaml
+name:
+  # under-name-comment
+  - first-array-child
+```
+then
+```bash
+yq '.name[0] | headComment' sample.yml
+```
+will output
+```yaml
+under-name-comment
+```
+
 ## Set head comment
 Given a sample.yml file of:
 ```yaml
@@ -62,6 +191,25 @@ will output
 a: cat
 ```
 
+## Set head comment of a map entry
+Given a sample.yml file of:
+```yaml
+f: foo
+a:
+  b: cat
+```
+then
+```bash
+yq '(.a | key) head_comment="single"' sample.yml
+```
+will output
+```yaml
+f: foo
+# single
+a:
+  b: cat
+```
+
 ## Set foot comment, using an expression
 Given a sample.yml file of:
 ```yaml
@@ -74,7 +222,6 @@ yq '. foot_comment=.a' sample.yml
 will output
 ```yaml
 a: cat
-
 # cat
 ```
 
@@ -99,6 +246,7 @@ Note the use of `...` to ensure key nodes are included.
 
 Given a sample.yml file of:
 ```yaml
+# hi
 a: cat # comment
 # great
 b: # key comment
@@ -116,7 +264,9 @@ b:
 ## Get line comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
 a: cat # meow
+# have a great day
 ```
 then
 ```bash

pkg/yqlib/doc/operators/compare.md

@@ -0,0 +1,100 @@
+# Compare Operators
+
+Comparison operators (`>`, `>=`, `<`, `<=`) can be used for comparing scalar values of the same time.
+
+The following types are currently supported:
+
+- numbers
+- strings
+- datetimes
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+
+## Compare numbers (>)
+Given a sample.yml file of:
+```yaml
+a: 5
+b: 4
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare equal numbers (>=)
+Given a sample.yml file of:
+```yaml
+a: 5
+b: 5
+```
+then
+```bash
+yq '.a >= .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare strings
+Compares strings by their bytecode.
+
+Given a sample.yml file of:
+```yaml
+a: zoo
+b: apple
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare date times
+You can compare date times. 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: 2021-01-01T03:10:00Z
+b: 2020-01-01T03:10:00Z
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Both sides are null: > is false
+Running
+```bash
+yq --null-input '.a > .b'
+```
+will output
+```yaml
+false
+```
+
+## Both sides are null: >= is true
+Running
+```bash
+yq --null-input '.a >= .b'
+```
+will output
+```yaml
+true
+```
+

pkg/yqlib/doc/operators/contains.md

@@ -2,12 +2,6 @@
 
 This returns `true` if the context contains the passed in parameter, and false otherwise.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Array contains array
 Array is equal or subset of
 

pkg/yqlib/doc/operators/create-collect-into-object.md

@@ -2,12 +2,6 @@
 
 This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Collect empty object
 Running
 ```bash
@@ -86,3 +80,16 @@ will output
 wrap: frog
 ```
 
+## Creating yaml from scratch with multiple objects
+Running
+```bash
+yq --null-input '(.a.b = "foo") | (.d.e = "bar")'
+```
+will output
+```yaml
+a:
+  b: foo
+d:
+  e: bar
+```
+

pkg/yqlib/doc/operators/datetime.md

@@ -13,11 +13,11 @@ To specify a custom parsing format, use the `with_dtf` operator. The first param
 yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
 ```
 
-See https://pkg.go.dev/time#pkg-constants for examples of formatting options.
+See the [library docs](https://pkg.go.dev/time#pkg-constants) for examples of formatting options.
 
 
 ## Timezones
-This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
+This uses golangs built in LoadLocation function to parse timezones strings. See the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
 
 
 ## Durations
@@ -25,12 +25,6 @@ Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/t
 
 You can durations to time using the `+` operator.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Format: from standard RFC3339 format
 Providing a single parameter assumes a standard RFC3339 datetime format. If the target format is not a valid yaml datetime format, the result will be a string tagged node.
 
@@ -156,7 +150,7 @@ a: 2021-01-01T03:10:00Z
 ```
 
 ## Date subtraction
-You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/datetime#date-time-formattings) for more information.
 
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/delete.md

@@ -2,12 +2,6 @@
 
 Deletes matching entries in maps or arrays.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/document-index.md

@@ -2,12 +2,6 @@
 
 Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Retrieve a document index
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/encode-decode.md

@@ -4,29 +4,26 @@ Encode operators will take the piped in object structure and encode it as a stri
 
 Note that you can optionally pass an indent value to the encode functions (see below).
 
-These operators are useful to process yaml documents that have stringified embeded yaml/json/props in them.
+These operators are useful to process yaml documents that have stringified embedded yaml/json/props in them.
 
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
-| Yaml | from_yaml | to_yaml(i)/@yaml |
-| JSON | from_json | to_json(i)/@json |
-| Properties |  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
-| XML | from_xml | to_xml(i)/@xml |
+| Yaml | from_yaml/@yamld | to_yaml(i)/@yaml |
+| JSON | from_json/@jsond | to_json(i)/@json |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
+| XML | from_xml/@xmld | to_xml(i)/@xml |
+| Base64 | @base64d | @base64 |
 
 
-CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a string.
 
 ## Encode value as json string
 Given a sample.yml file of:
@@ -120,6 +117,60 @@ b: |
   cool = thing
 ```
 
+## Decode props encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats=great
+  dogs=cool as well
+```
+then
+```bash
+yq '.a |= @propsd' sample.yml
+```
+will output
+```yaml
+a:
+  cats: great
+  dogs: cool as well
+```
+
+## Decode csv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats,dogs
+  great,cool as well
+```
+then
+```bash
+yq '.a |= @csvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
+## Decode tsv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats	dogs
+  great	cool as well
+```
+then
+```bash
+yq '.a |= @tsvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
 ## Encode value as yaml string
 Indent defaults to 2
 
@@ -354,3 +405,66 @@ b:
   foo: bar
 ```
 
+## Encode a string to base64
+Given a sample.yml file of:
+```yaml
+coolData: a special string
+```
+then
+```bash
+yq '.coolData | @base64' sample.yml
+```
+will output
+```yaml
+YSBzcGVjaWFsIHN0cmluZw==
+```
+
+## Encode a yaml document to base64
+Pipe through @yaml first to convert to a string, then use @base64 to encode it.
+
+Given a sample.yml file of:
+```yaml
+a: apple
+```
+then
+```bash
+yq '@yaml | @base64' sample.yml
+```
+will output
+```yaml
+YTogYXBwbGUK
+```
+
+## Decode a base64 encoded string
+Decoded data is assumed to be a string.
+
+Given a sample.yml file of:
+```yaml
+coolData: V29ya3Mgd2l0aCBVVEYtMTYg8J+Yig==
+```
+then
+```bash
+yq '.coolData | @base64d' sample.yml
+```
+will output
+```yaml
+Works with UTF-16 😊
+```
+
+## Decode a base64 encoded yaml document
+Pipe through `from_yaml` to parse the decoded base64 string as a yaml document.
+
+Given a sample.yml file of:
+```yaml
+coolData: YTogYXBwbGUK
+```
+then
+```bash
+yq '.coolData |= (@base64d | from_yaml)' sample.yml
+```
+will output
+```yaml
+coolData:
+  a: apple
+```
+

pkg/yqlib/doc/operators/entries.md

@@ -2,12 +2,6 @@
 
 Similar to the same named functions in `jq` these functions convert to/from an object and an array of key-value pairs. This is most useful for performing operations on keys of maps.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## to_entries Map
 Given a sample.yml file of:
 ```yaml
@@ -107,6 +101,26 @@ KEY_a: 1
 KEY_b: 2
 ```
 
+## Custom sort map keys
+Use to_entries to convert to an array of key/value pairs, sort the array using sort/sort_by/etc, and convert it back.
+
+Given a sample.yml file of:
+```yaml
+a: 1
+c: 3
+b: 2
+```
+then
+```bash
+yq 'to_entries | sort_by(.key) | reverse | from_entries' sample.yml
+```
+will output
+```yaml
+c: 3
+b: 2
+a: 1
+```
+
 ## Use with_entries to filter the map
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/env-variable-operators.md

@@ -3,11 +3,24 @@
 These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
 
 There are three operators:
+
 -  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
 - `strenv` which also takes a single environment variable name, and always parses the variable as a string.
 - `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
 
 
+## EnvSubst Options
+You can optionally pass envsubst any of the following options:
+
+  - nu: NoUnset, this will fail if there are any referenced variables that are not set
+  - ne: NoEmpty, this will fail if there are any referenced variables that are empty
+  - ff: FailFast, this will abort on the first failure (rather than collect all the errors)
+
+E.g:
+`envsubst(ne, ff)` will fail on the first empty variable.
+
+See [Imposing Restrictions](https://github.com/a8m/envsubst#imposing-restrictions) in the `envsubst` documentation for more information, and below for examples.
+
 ## Tip
 To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
 as follows:
@@ -17,12 +30,6 @@ yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
 ```
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Read string environment variable
 Running
 ```bash
@@ -133,23 +140,83 @@ the cat meows
 ## Replace strings with envsubst, missing variables
 Running
 ```bash
-myenv="cat" yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
 ```
 will output
 ```yaml
 the  meows
 ```
 
+## Replace strings with envsubst(nu), missing variables
+(nu) not unset, will fail if there are unset (missing) variables
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst(nu)'
+```
+will output
+```bash
+Error: variable ${myenvnonexisting} not set
+```
+
+## Replace strings with envsubst(ne), missing variables
+(ne) not empty, only validates set variables
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst(ne)'
+```
+will output
+```yaml
+the  meows
+```
+
+## Replace strings with envsubst(ne), empty variable
+(ne) not empty, will fail if a references variable is empty
+
+Running
+```bash
+myenv="" yq --null-input '"the ${myenv} meows" | envsubst(ne)'
+```
+will output
+```bash
+Error: variable ${myenv} set but empty
+```
+
 ## Replace strings with envsubst, missing variables with defaults
 Running
 ```bash
-myenv="cat" yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
+yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
 ```
 will output
 ```yaml
 the dog meows
 ```
 
+## Replace strings with envsubst(nu), missing variables with defaults
+Having a default specified skips over the missing variable.
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst(nu)'
+```
+will output
+```yaml
+the dog meows
+```
+
+## Replace strings with envsubst(ne), missing variables with defaults
+Fails, because the variable is explicitly set to blank.
+
+Running
+```bash
+myEmptyEnv="" yq --null-input '"the ${myEmptyEnv-dog} meows" | envsubst(ne)'
+```
+will output
+```bash
+Error: variable ${myEmptyEnv} set but empty
+```
+
 ## Replace string environment variable in document
 Given a sample.yml file of:
 ```yaml
@@ -164,3 +231,26 @@ will output
 v: cat meow
 ```
 
+## (Default) Return all envsubst errors
+By default, all errors are returned at once.
+
+Running
+```bash
+yq --null-input '"the ${notThere} ${alsoNotThere}" | envsubst(nu)'
+```
+will output
+```bash
+Error: variable ${notThere} not set
+variable ${alsoNotThere} not set
+```
+
+## Fail fast, return the first envsubst error (and abort)
+Running
+```bash
+yq --null-input '"the ${notThere} ${alsoNotThere}" | envsubst(nu,ff)'
+```
+will output
+```bash
+Error: variable ${notThere} not set
+```
+

pkg/yqlib/doc/operators/equals.md

@@ -1,4 +1,4 @@
-# Equals
+# Equals / Not Equals
 
 This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
@@ -12,11 +12,14 @@ It is most often used with the select operator to find particular nodes:
 select(.a == .b)
 ```
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+The not equals `!=` operator returns `false` if the LHS is equal to the RHS.
+
+## Related Operators
+
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
 
-`yq e <exp> <file>`
-{% endhint %}
 
 ## Match string
 Given a sample.yml file of:
@@ -72,7 +75,7 @@ true
 false
 ```
 
-## Dont match number
+## Don't match number
 Given a sample.yml file of:
 ```yaml
 - 3
@@ -100,7 +103,7 @@ will output
 true
 ```
 
-## Non exisitant key doesn't equal a value
+## Non existent key doesn't equal a value
 Given a sample.yml file of:
 ```yaml
 a: frog

pkg/yqlib/doc/operators/error.md

@@ -0,0 +1,50 @@
+# Error
+
+Use this operation to short-circuit expressions. Useful for validation.
+
+## Validate a particular value
+Given a sample.yml file of:
+```yaml
+a: hello
+```
+then
+```bash
+yq 'select(.a == "howdy") or error(".a [" + .a + "] is not howdy!")' sample.yml
+```
+will output
+```bash
+Error: .a [hello] is not howdy!
+```
+
+## Validate the environment variable is a number - invalid
+Running
+```bash
+numberOfCats="please" yq --null-input 'env(numberOfCats) | select(tag == "!!int") or error("numberOfCats is not a number :(")'
+```
+will output
+```bash
+Error: numberOfCats is not a number :(
+```
+
+## Validate the environment variable is a number - valid
+`with` can be a convenient way of encapsulating validation.
+
+Given a sample.yml file of:
+```yaml
+name: Bob
+favouriteAnimal: cat
+```
+then
+```bash
+numberOfCats="3" yq '
+	with(env(numberOfCats); select(tag == "!!int") or error("numberOfCats is not a number :(")) | 
+	.numPets = env(numberOfCats)
+' sample.yml
+```
+will output
+```yaml
+name: Bob
+favouriteAnimal: cat
+numPets: 3
+```
+

pkg/yqlib/doc/operators/eval.md

@@ -6,12 +6,6 @@ Use `eval` to dynamically process an expression - for instance from an environme
 
 Tip: This can be useful way parameterise complex scripts.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Dynamically evaluate a path
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/file-operators.md

@@ -10,12 +10,6 @@ Note the use of eval-all to ensure all documents are loaded into memory.
 yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Get filename
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/flatten.md

@@ -1,12 +1,6 @@
 # Flatten
 This recursively flattens arrays.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Flatten
 Recursively flattens all arrays
 

pkg/yqlib/doc/operators/group-by.md

@@ -2,12 +2,6 @@
 
 This is used to group items in an array by an expression.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Group by field
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/has.md

@@ -2,12 +2,6 @@
 
 This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Has map key
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/headers/assign-update.md

@@ -6,4 +6,8 @@ This operator is used to update node values. It can be used in either the:
 Which will assign the LHS node values 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, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
+
+
+### Flags
+- `c` clobber custom tags

pkg/yqlib/doc/operators/headers/boolean-operators.md

@@ -9,3 +9,9 @@ The `or` and `and` operators take two parameters and return a boolean result.
 `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)

pkg/yqlib/doc/operators/headers/column.md

@@ -0,0 +1,3 @@
+# Column
+
+Returns the column of the matching node. Starts from 1, 0 indicates there was no column data.

pkg/yqlib/doc/operators/headers/comment-operators.md

@@ -1,6 +1,6 @@
 # Comment Operators
 
-Use these comment operators to set or retrieve comments.
+Use these comment operators to set or retrieve comments. Note that line comments on maps/arrays are actually set on the _key_ node as opposed to the _value_ (map/array). See below for examples.
 
 Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
 

pkg/yqlib/doc/operators/headers/compare.md

@@ -0,0 +1,15 @@
+# Compare Operators
+
+Comparison operators (`>`, `>=`, `<`, `<=`) can be used for comparing scalar values of the same time.
+
+The following types are currently supported:
+
+- numbers
+- strings
+- datetimes
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)

pkg/yqlib/doc/operators/headers/datetime.md

@@ -13,11 +13,11 @@ To specify a custom parsing format, use the `with_dtf` operator. The first param
 yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
 ```
 
-See https://pkg.go.dev/time#pkg-constants for examples of formatting options.
+See the [library docs](https://pkg.go.dev/time#pkg-constants) for examples of formatting options.
 
 
 ## Timezones
-This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
+This uses golangs built in LoadLocation function to parse timezones strings. See the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
 
 
 ## Durations

pkg/yqlib/doc/operators/headers/encode-decode.md

@@ -4,20 +4,23 @@ Encode operators will take the piped in object structure and encode it as a stri
 
 Note that you can optionally pass an indent value to the encode functions (see below).
 
-These operators are useful to process yaml documents that have stringified embeded yaml/json/props in them.
+These operators are useful to process yaml documents that have stringified embedded yaml/json/props in them.
 
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
-| Yaml | from_yaml | to_yaml(i)/@yaml |
-| JSON | from_json | to_json(i)/@json |
-| Properties |  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
-| XML | from_xml | to_xml(i)/@xml |
+| Yaml | from_yaml/@yamld | to_yaml(i)/@yaml |
+| JSON | from_json/@jsond | to_json(i)/@json |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
+| XML | from_xml/@xmld | to_xml(i)/@xml |
+| Base64 | @base64d | @base64 |
 
 
-CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 
+
+Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a string.

pkg/yqlib/doc/operators/headers/env-variable-operators.md

@@ -3,11 +3,24 @@
 These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
 
 There are three operators:
+
 -  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
 - `strenv` which also takes a single environment variable name, and always parses the variable as a string.
 - `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
 
 
+## EnvSubst Options
+You can optionally pass envsubst any of the following options:
+
+  - nu: NoUnset, this will fail if there are any referenced variables that are not set
+  - ne: NoEmpty, this will fail if there are any referenced variables that are empty
+  - ff: FailFast, this will abort on the first failure (rather than collect all the errors)
+
+E.g:
+`envsubst(ne, ff)` will fail on the first empty variable.
+
+See [Imposing Restrictions](https://github.com/a8m/envsubst#imposing-restrictions) in the `envsubst` documentation for more information, and below for examples.
+
 ## Tip
 To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
 as follows:

pkg/yqlib/doc/operators/headers/equals.md

@@ -1,4 +1,4 @@
-# Equals
+# Equals / Not Equals
 
 This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
@@ -11,3 +11,12 @@ It is most often used with the select operator to find particular nodes:
 ```
 select(.a == .b)
 ```
+
+The not equals `!=` operator returns `false` if the LHS is equal to the RHS.
+
+## Related Operators
+
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+

pkg/yqlib/doc/operators/headers/error.md

@@ -0,0 +1,3 @@
+# Error
+
+Use this operation to short-circuit expressions. Useful for validation.

pkg/yqlib/doc/operators/headers/line.md

@@ -0,0 +1,3 @@
+# Line
+
+Returns the line of the matching node. Starts from 1, 0 indicates there was no line data.

pkg/yqlib/doc/operators/headers/load.md

@@ -1,14 +1,46 @@
 # Load
 
-The `load`/`strload` operator allows you to load in content from another file referenced in your yaml document.
+The load operators allows you to load in content from another file.
 
 Note that you can use string operators like `+` and `sub` to modify the value in the yaml file to a path that exists in your system.
 
-Use `strload` to load text based content as a string block, and `load` to interpret the file as yaml.
+You can load files of the following supported types:
 
-Lets say there is a file `../../examples/thing.yml`:
+|Format | Load Operator |
+| --- | --- |
+| Yaml | load |
+| XML | load_xml |
+| Properties | load_props |
+| Plain String | load_str |
+| Base64 | load_base64 |
+
+## Samples files for tests:
+
+### yaml
+
+`../../examples/thing.yml`:
 
 ```yaml
 a: apple is included
 b: cool
 ```
+
+### xml
+`small.xml`:
+
+```xml
+<this>is some xml</this>
+```
+
+### properties
+`small.properties`:
+
+```properties
+this.is = a properties file
+```
+
+### base64
+`base64.txt`:
+```
+bXkgc2VjcmV0IGNoaWxsaSByZWNpcGUgaXMuLi4u
+```

pkg/yqlib/doc/operators/headers/multiply-merge.md

@@ -14,10 +14,24 @@ You can control how objects are merged by using one or more of the following fla
 - `d` deeply merge arrays
 - `?` only merge _existing_ fields
 - `n` only merge _new_ fields
+- `c` clobber custom tags
 
-### Merging files
+
+### Merge two files together
+This uses the load operator to merge file2 into file1.
+```bash
+yq '. *= load("file2.yml")' file1.yml
+```
+
+### Merging all files
 Note the use of `eval-all` to ensure all documents are loaded into memory.
 
 ```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+yq eval-all '. as $item ireduce ({}; . * $item )' *.yml
 ```
+
+# Merging complex arrays together by a key field
+By default - `yq` merge is naive. It merges maps when they match the key name, and arrays are merged either by appending them together, or merging the entries by their position in the array.
+
+For more complex array merging (e.g. merging items that match on a certain key) please see the example [here](https://mikefarah.gitbook.io/yq/operators/multiply-merge#merge-arrays-of-objects-together-matching-on-a-key)
+

pkg/yqlib/doc/operators/headers/path.md

@@ -1,5 +1,8 @@
 # Path
 
-The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+The `path` operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
 
 You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.
+
+Use `setpath` to set a value to the path array returned by `path`, and similarly `delpaths` for an array of path arrays.
+

pkg/yqlib/doc/operators/headers/pick.md

@@ -0,0 +1,5 @@
+# Pick
+
+Filter a map by the specified list of keys. Map is returned with the key in the order of the pick list.
+
+Similarly, filter an array by the specified list of indices.

pkg/yqlib/doc/operators/headers/reduce.md

@@ -19,4 +19,4 @@ On the RHS there is `<init>`, the starting value of the accumulator and `<block>
 ## yq vs jq syntax
 Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
 
-To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
+To that end, the reduce operator is called `ireduce` for backwards compatibility if a `jq` like prefix version of `reduce` is ever added.

pkg/yqlib/doc/operators/headers/reverse.md

@@ -0,0 +1,3 @@
+# Reverse
+
+Reverses the order of the items in an array 

pkg/yqlib/doc/operators/headers/select.md

@@ -1,3 +1,9 @@
 # Select
 
 Select is used to filter arrays and maps by a boolean expression.
+
+## 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)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)

pkg/yqlib/doc/operators/headers/sort-keys.md

@@ -11,3 +11,6 @@ diff file1.yml file2.yml
 ```
 
 Note that `yq` does not yet consider anchors when sorting by keys - this may result in invalid yaml documents if your are using merge anchors.
+
+For more advanced sorting, using `to_entries` to convert the map to an array, then sort/process the array as you like (e.g. using `sort_by`) and convert back to a map using `from_entries`.
+See [here](https://mikefarah.gitbook.io/yq/operators/entries#custom-sort-map-keys) for an example. 

pkg/yqlib/doc/operators/headers/sort.md

@@ -2,4 +2,7 @@
 
 Sorts an array. Use `sort` to sort an array as is, or `sort_by(exp)` to sort by a particular expression (e.g. subfield).
 
+To sort by descending order, pipe the results through the `reverse` operator after sorting.
+
 Note that at this stage, `yq` only sorts scalar fields.
+

pkg/yqlib/doc/operators/headers/string-operators.md

@@ -1,8 +1,21 @@
 # String Operators
 
 ## RegEx
-This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.
+This uses golangs native regex functions under the hood - See their [docs](https://github.com/google/re2/wiki/Syntax) for the supported syntax.
 
+Case insensitive tip: prefix the regex with `(?i)` - e.g. `test("(?i)cats)"`.
+
+### match(regEx)
+This operator returns the substring match details of the given regEx.
+
+### capture(regEx)
+Capture returns named RegEx capture groups in a map. Can be more convenient than `match` depending on what you are doing.
+
+## test(regEx)
+Returns true if the string matches the RegEx, false otherwise.
+
+## sub(regEx, replacement)
+Substitutes matched substrings. The first parameter is the regEx to match substrings within the original string. The second is a what to replace those matches with. This can refer to capture groups from the first RegEx.
 
 ## String blocks, bash and newlines
 Bash is notorious for chomping on precious trailing newline characters, making it tricky to set strings with newlines properly. In particular, the `$( exp )` _will trim trailing newlines_.

pkg/yqlib/doc/operators/headers/unique.md

@@ -1,3 +1,4 @@
 # Unique
 
-This is used to filter out duplicated items in an array.
+This is used to filter out duplicated items in an array. Note that the original order of the array is maintained.
+

pkg/yqlib/doc/operators/keys.md

@@ -2,12 +2,6 @@
 
 Use the `keys` operator to return map keys or array indices. 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Map keys
 Given a sample.yml file of:
 ```yaml
@@ -118,3 +112,43 @@ will output
 comment on key
 ```
 
+## Check node is a key
+Given a sample.yml file of:
+```yaml
+a:
+  b:
+    - cat
+  c: frog
+```
+then
+```bash
+yq '[... | { "p": path | join("."), "isKey": is_key, "tag": tag }]' sample.yml
+```
+will output
+```yaml
+- p: ""
+  isKey: false
+  tag: '!!map'
+- p: a
+  isKey: true
+  tag: '!!str'
+- p: a
+  isKey: false
+  tag: '!!map'
+- p: a.b
+  isKey: true
+  tag: '!!str'
+- p: a.b
+  isKey: false
+  tag: '!!seq'
+- p: a.b.0
+  isKey: false
+  tag: '!!str'
+- p: a.c
+  isKey: true
+  tag: '!!str'
+- p: a.c
+  isKey: false
+  tag: '!!str'
+```
+