action uses built docker image

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/ISSUE_TEMPLATE/feature_request.md

@@ -26,7 +26,7 @@ country: Australia
 And we run a command:
 
 ```bash
-yq eval 'predictWeatherOf(.country)'
+yq 'predictWeatherOf(.country)'
 ```
 
 it could output

.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-github-action.yml

@@ -0,0 +1,63 @@
+name: Release Github action 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 '${{ secrets.DOCKER_USERNAME }}' --password-stdin
+          cd github-action
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(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/docker-release.yml

@@ -0,0 +1,62 @@
+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" \
+            .

.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: |
@@ -25,6 +28,7 @@ jobs:
         fi
 
     - name: Check the build
+      shell: bash -l {0}
       run: |
         export PATH=${PATH}:`go env GOPATH`/bin
         scripts/devtools.sh

.github/workflows/release.yml

@@ -3,15 +3,16 @@ 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'
       - name: Compile man page markup
         id: gen-man-page-md
         run: |
@@ -39,72 +40,14 @@ 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 +1,8 @@
 name: Test Yq Action
 on: [push]
+permissions:
+  contents: read
+
 jobs:
 
   build:
@@ -7,13 +10,16 @@ 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
@@ -48,4 +49,16 @@ test*.yml
 
 # man page
 man.md
-yq.1
+yq.1
+
+# debian pkg
+_build
+debian/files
+
+# intellij
+/.idea
+
+# vscode
+.vscode
+
+yq3

.golangci.yml

@@ -18,6 +18,14 @@ linters:
     - revive
     - unconvert
     - unparam
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      - io/ioutil
+    packages-with-error-message:
+      - io/ioutil: "The 'io/ioutil' package is deprecated. Use corresponding 'os' or 'io' functions instead."
 issues:
   exclude-rules:
   - linters:

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

@@ -1,49 +1,79 @@
 # yq
 
-![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq)
+![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq) ![CodeQL](https://github.com/mikefarah/yq/workflows/CodeQL/badge.svg)
 
 
-a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
+a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json, xml, properties, csv and tsv. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
 
 yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker and Podman, all listed below.
 
+## 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 longer 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 one or more files).
+
+TLDR:
+
+Prior to 4.18.1 
+```bash
+yq e '.cool' - < file.yaml
+```
+
+4.18+ 
+```bash
+yq '.cool' < file.yaml
+```
+
+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 e '.a.b[0].c' file.yaml
+yq '.a.b[0].c' file.yaml
 ```
 
 Pipe from STDIN:
 ```bash
-cat file.yaml | yq e '.a.b[0].c' -
+yq '.a.b[0].c' < file.yaml
 ```
 
 Update a yaml file, inplace
 ```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
+yq -i '.a.b[0].c = "cool"' file.yaml
 ```
 
 Update using environment variables
 ```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
 ```
 
 Merge multiple files
-```
+```bash
+# note the use of `ea` to evaluate all the files at once
+# instead of in sequence
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```
 
 Multiple updates to a yaml file
 ```bash
-yq e -i '
+yq -i '
   .a.b[0].c = "cool" |
   .x.y.z = "foobar" |
   .person.name = strenv(NAME)
 ' file.yaml
 ```
 
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+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
 
@@ -82,30 +112,32 @@ snap install yq
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:
 
 ```
-sudo cat /etc/myfile | yq e '.a.path' - 
+sudo cat /etc/myfile | yq '.a.path'
 ```
 
 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
 ### Run with Docker or Podman
-
 #### Oneshot use:
 
 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```
 
+Note that you can run `yq` in docker without network access and other privileges if you desire,
+namely `--security-opt=no-new-privileges --cap-drop all --network none`.
+
 ```bash
-podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```
 
 #### Pipe in via STDIN:
@@ -113,11 +145,11 @@ podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression
 You'll need to pass the `-i\--interactive` flag to docker:
 
 ```bash
-cat myfile.yml | docker run -i --rm mikefarah/yq e . -
+docker run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 ```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq e . -
+podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 #### Run commands interactively:
@@ -143,8 +175,6 @@ yq() {
   podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```
-
-
 #### Running as root:
 
 `yq`'s container image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the container image, or you're having permissions issues when attempting to read/write files you'll need to either:
@@ -164,23 +194,49 @@ Or, in your Dockerfile:
 FROM mikefarah/yq
 
 USER root
-RUN apk add bash
+RUN apk add --no-cache bash
 USER yq
 ```
 
+#### Missing timezone data
+By default, the alpine image yq uses does not include timezone data. If you'd like to use the `tz` operator, you'll need to include this data:
+
+```
+FROM mikefarah/yq
+
+USER root
+RUN apk add --no-cache tzdata
+USER yq
+```
+
+#### Podman with SELinux
+
+If you are using podman with SELinux, you will need to set the shared volume flag `:z` on the volume mount:
+
+```
+-v "${PWD}":/workdir:z
+```
+
 ### GitHub Action
 ```
   - name: Set foobar to cool
     uses: mikefarah/yq@master
     with:
-      cmd: yq eval -i '.foo.bar = "cool"' 'config.yml'
+      cmd: yq -i '.foo.bar = "cool"' 'config.yml'
+  - name: Get an entry with a variable that might contain dots or spaces
+    id: get_username
+    uses: mikefarah/yq@master
+    with:
+      cmd: yq '.all.children.["${{ matrix.ip_address }}"].username' ops/inventories/production.yml
+  - name: Reuse a variable obtained in another step
+    run: echo ${{ steps.get_username.outputs.result }}
 ```
 
 See https://mikefarah.gitbook.io/yq/usage/github-action for more.
 
-### Go Get:
+### Go Install:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v4
+go install github.com/mikefarah/yq/v4@latest
 ```
 
 ## Community Supported Installation methods
@@ -195,6 +251,12 @@ webi yq
 See [webi](https://webinstall.dev/)
 Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)
 
+### Arch Linux
+
+```
+pacman -S go-yq
+```
+
 ### Windows:
 [![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
 [![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
@@ -203,6 +265,13 @@ 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/)
 ```
@@ -232,20 +301,23 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 ## Features
 - [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
-- Uses similar syntax as `jq` but works with YAML and JSON files
+- Uses similar syntax as `jq` but works with YAML, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
 - Fully supports multi document yaml files
 - Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
 - Colorized yaml output
-- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
-- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
+- [Date/Time manipulation and formatting with TZ](https://mikefarah.gitbook.io/yq/operators/datetime)
+- [Deeply data structures](https://mikefarah.gitbook.io/yq/operators/traverse-read)
+- [Sort keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
 - Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
-- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update 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 properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
-- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
+- [Convert to/from json/ndjson](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
+- [Convert to/from properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
+- [Convert to/from csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
 - [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
 - [Github Action](https://mikefarah.gitbook.io/yq/usage/github-action) to use in your automated pipeline (thanks @devorbitus)
@@ -259,28 +331,41 @@ Usage:
   yq [flags]
   yq [command]
 
+Examples:
+
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+yq '.stuff' < myfile.yml # outputs the data at the "stuff" node from "myfile.yml"
+
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+
+
 Available Commands:
-  eval             Apply the expression to each document in each yaml file in sequence
+  completion       Generate the autocompletion script for the specified shell
+  eval             (default) Apply the expression to each document in each yaml file in sequence
   eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
   help             Help about any command
   shell-completion Generate completion script
 
 Flags:
-  -C, --colors                force print with colors
-  -e, --exit-status           set exit status if there are no matches or null or false is returned
-  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
-      --header-preprocess     Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
-  -h, --help                  help for yq
-  -I, --indent int            sets indent level for output (default 2)
-  -i, --inplace               update the yaml file inplace of first yaml file given.
-  -M, --no-colors             force print with no colors
-  -N, --no-doc                Don't print document separators (---)
-  -n, --null-input            Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-  -o, --output-format string  [yaml|y|json|j|props|p] output format type. (default "yaml")
-  -P, --prettyPrint           pretty print, shorthand for '... style = ""'
-      --unwrapScalar          unwrap scalar, print the value with no quotes, colors or comments (default true)
-  -v, --verbose               verbose mode
-  -V, --version               Print version information and quit
+  -C, --colors                        force print with colors
+  -e, --exit-status                   set exit status if there are no matches or null or false is returned
+  -f, --front-matter string           (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
+      --header-preprocess             Slurp any header comments and separators before processing expression. (default true)
+  -h, --help                          help for yq
+  -I, --indent int                    sets indent level for output (default 2)
+  -i, --inplace                       update the file inplace of first file given.
+  -p, --input-format string           [yaml|y|xml|x] parse format for input. Note that json is a subset of yaml. (default "yaml")
+  -M, --no-colors                     force print with no colors
+  -N, --no-doc                        Don't print document separators (---)
+  -n, --null-input                    Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.
+  -o, --output-format string          [yaml|y|json|j|props|p|xml|x] output format type. (default "yaml")
+  -P, --prettyPrint                   pretty print, shorthand for '... style = ""'
+  -s, --split-exp string              print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.
+      --unwrapScalar                  unwrap scalar, print the value with no quotes, colors or comments (default true)
+  -v, --verbose                       verbose mode
+  -V, --version                       Print version information and quit
+      --xml-attribute-prefix string   prefix for xml attributes (default "+")
+      --xml-content-name string       name for xml content (if no attribute name is present). (default "+content")
 
 Use "yq [command] --help" for more information about a command.
 ```

acceptance_tests/basic.sh

@@ -1,12 +1,225 @@
 #!/bin/bash
 
 setUp() {
-  rm test*.yml || true
+  rm test*.yml 2>/dev/null || true
+  rm .xyz 2>/dev/null || true
+  rm instructions.txt 2>/dev/null || true
 }
 
 testBasicEvalRoundTrip() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq ea test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq ea '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicPipeWithDot() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat test.yml | ./yq '.')
+  assertEquals "a: 123" "$X"
+}
+
+testBasicExpressionMatchesFileName() {
+  ./yq -n ".xyz = 123" > test.yml
+  touch .xyz
+  
+  X=$(./yq --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(./yq ea --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+}
+
+testBasicExpressionFromFile() {
+  ./yq -n ".xyz = 123" > test.yml
+  echo '.xyz = "meow" | .cool = "frog"' > instructions.txt
+  
+  X=$(./yq --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+
+  X=$(./yq ea --from-file instructions.txt test.yml -o=j -I=0)
+  assertEquals '{"xyz":"meow","cool":"frog"}' "$X"
+}
+
+testBasicGitHubAction() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq e test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.yml)
+  assertEquals "a: 123" "$X"
+}
+
+testBasicGitHubActionWithExpression() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq e '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq ea '.a' test.yml)
+  assertEquals "123" "$X"
+}
+
+
+testBasicEvalAllAllFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(./yq ea test.yml test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+# when given a file, don't read STDIN
+# otherwise strange things start happening
+# in scripts
+# https://github.com/mikefarah/yq/issues/1115
+
+testBasicCatWithFilesNoDash() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml)
+  Y=$(./yq e '.' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+# when the nullinput flag is used
+# 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)
+  assertEquals "$Y" "$X"
+}
+
+testBasicCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+
+testBasicStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalRoundTripNoEval() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicStdInWithOneArg() {
   ./yq e -n ".a = 123" > test.yml
-  X=$(./yq e '.a' test.yml)
+  X=$(cat test.yml | ./yq e ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ea ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ".a")
   assertEquals 123 "$X"
 }
 
@@ -19,6 +232,15 @@ EOL
   assertEquals "10" "$X"
 }
 
+testBasicUpdateInPlaceSequenceNoEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  ./yq -i ".a = 10" test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals "10" "$X"
+}
+
 testBasicUpdateInPlaceSequenceEvalAll() {
   cat >test.yml <<EOL
 a: 0
@@ -28,6 +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=$(./yq e '.z' test.yml)
@@ -40,6 +296,12 @@ testBasicExitStatus() {
   assertEquals 1 "$?"
 }
 
+testBasicExitStatusNoEval() {
+  echo "a: cat" > test.yml
+  X=$(./yq -e '.z' test.yml 2&>/dev/null)
+  assertEquals 1 "$?"
+}
+
 testBasicExtractFieldWithSeperator() {
     cat >test.yml <<EOL
 ---
@@ -69,4 +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/completion.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+testCompletionRuns() {
+    result=$(./yq __complete "" 2>&1)
+    assertEquals 0 $?
+    assertContains "$result" "Completion ended with directive:"
+}
+
+source ./scripts/shunit2

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

@@ -0,0 +1,182 @@
+#!/bin/bash
+
+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
+}
+
+testInputProperties() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputPropertiesGitHubAction() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=csv test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=csv test.csv)
+  assertEquals "$expected" "$X"
+}
+
+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" "$X"
+}
+
+
+
+
+testInputXml() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +legs: "4"
+EOM
+
+  X=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlNamespaces() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+EOL
+
+  read -r -d '' expected << EOM
+map:
+  +xmlns: some-namespace
+  +xmlns:xsi: some-instance
+  +xsi:schemaLocation: some-url
+EOM
+
+  X=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testInputXmlStrict() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Catherine.">
+<!ENTITY copyright "(r) Great">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+EOL
+
+  X=$(./yq -p=xml --xml-strict-mode test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+
+  X=$(./yq ea -p=xml --xml-strict-mode test.yml 2>&1)
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+}
+
+testInputXmlGithubAction() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +legs: "4"
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2

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

@@ -102,4 +102,107 @@ 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"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmlShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmComplex() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat", "dog"], +f: meow}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b f="meow">
+    <c>cat</c>
+    <c>dog</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
 source ./scripts/shunit2

acceptance_tests/pipe.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+a: frog
+EOL
+}
+
+testPipeViaCatWithParam() {
+  X=$(cat test.yml | ./yq '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEval() {
+  X=$(cat test.yml | ./yq e '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEvalAll() {
+  X=$(cat test.yml | ./yq ea '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatNoParam() {
+  X=$(cat test.yml | ./yq)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEval() {
+  X=$(cat test.yml | ./yq e)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEvalAll() {
+  X=$(cat test.yml | ./yq ea)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishWithParam() {
+  X=$(./yq '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEval() {
+  X=$(./yq e '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEvalAll() {
+  X=$(./yq ea '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishNoParam() {
+  X=$(./yq < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEval() {
+  X=$(./yq e < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEvalAll() {
+  X=$(./yq ea < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+source ./scripts/shunit2

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/commands_test.go

@@ -1,83 +0,0 @@
-package cmd
-
-// import (
-// 	"strings"
-// 	"testing"
-
-// 	"github.com/mikefarah/yq/v3/test"
-// 	"github.com/spf13/cobra"
-// )
-
-// func getRootCommand() *cobra.Command {
-// 	return New()
-// }
-
-// func TestRootCmd(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "Usage:") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_Help(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--help")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "yq is a lightweight and portable command-line YAML processor. It aims to be the jq or sed of yaml files.") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VerboseLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--verbose")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VerboseShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-v")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VersionShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-V")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VersionLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--version")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }

cmd/constant.go

@@ -10,6 +10,9 @@ var inputFormat = "yaml"
 
 var xmlAttributePrefix = "+"
 var xmlContentName = "+content"
+var xmlStrictMode = false
+var xmlKeepNamespace = true
+var xmlUseRawToken = true
 
 var exitStatus = false
 var forceColor = false
@@ -26,5 +29,10 @@ 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"
@@ -39,7 +38,7 @@ Note that it consumes more memory than eval.
 	}
 	return cmdEvalAll
 }
-func evaluateAll(cmd *cobra.Command, args []string) error {
+func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -47,27 +46,28 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 
 	var err error
 
-	firstFileIndex, err := initCommand(cmd, args)
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}
 
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-
 	out := cmd.OutOrStdout()
 
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -80,17 +80,21 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	printerWriter := configurePrinterWriter(format, out)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
 
-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	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()
@@ -101,22 +105,17 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	}
 
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
+
 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
+		if nullInput {
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer, "")
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
-		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, 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"
@@ -13,7 +12,7 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "Apply the expression to each document in each yaml file in sequence",
+		Short:   "(default) Apply the expression to each document in each yaml file in sequence",
 		Example: `
 # Reads field under the given path for each file
 yq e '.a.b' f1.yml f2.yml 
@@ -44,43 +43,45 @@ expression and prints the result in sequence.`,
 }
 
 func processExpression(expression string) string {
-	var prettyPrintExp = `(... | (select(tag != "!!str"), select(tag == "!!str") | select(test("(?i)^(y|yes|n|no|on|off)$") | not))  ) style=""`
+
 	if prettyPrint && expression == "" {
-		return prettyPrintExp
+		return yqlib.PrettyPrintExp
 	} else if prettyPrint {
-		return fmt.Sprintf("%v | %v", expression, prettyPrintExp)
+		return fmt.Sprintf("%v | %v", expression, yqlib.PrettyPrintExp)
 	}
 	return expression
 }
 
-func evaluateSequence(cmd *cobra.Command, args []string) error {
+func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
 	// 2+ args, [0] = expression, file the rest
 
+	out := cmd.OutOrStdout()
+
 	var err error
-	firstFileIndex, err := initCommand(cmd, args)
+
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}
 
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-
-	out := cmd.OutOrStdout()
-
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -88,24 +89,28 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	printerWriter := configurePrinterWriter(format, out)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
 
-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printer := yqlib.NewPrinter(encoder, printerWriter)
 
 	decoder, err := configureDecoder()
 	if err != nil {
 		return err
 	}
-
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
 	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
+		yqlib.GetLogger().Debug("using front matter handler")
+		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
 		err = frontMatterHandler.Split()
 		if err != nil {
 			return err
 		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
+		args[0] = frontMatterHandler.GetYamlFrontMatterFilename()
 
 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -117,20 +122,14 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 
 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
+		if nullInput {
+			err = streamEvaluator.EvaluateNew(processExpression(expression), printer, "")
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
-		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -14,17 +14,30 @@ func New() *cobra.Command {
 		Short: "yq is a lightweight and portable command-line YAML processor.",
 		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
+		Example: `
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+
+# read the "stuff" node from "myfile.yml"
+yq '.stuff' < myfile.yml
+
+# update myfile.yml in place
+yq -i '.stuff = "foo"' myfile.yml
+
+# print contents of sample.json as idiomatic YAML
+yq -P sample.json
+`,
+
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if version {
 				cmd.Print(GetVersionDisplay())
 				return nil
 			}
-			cmd.Println(cmd.UsageString())
-			return nil
+			return evaluateSequence(cmd, args)
 
 		},
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			cmd.SetOut(cmd.OutOrStdout())
+
 			var format = logging.MustStringFormatter(
 				`%{color}%{time:15:04:05} %{shortfunc} [%{level:.4s}]%{color:reset} %{message}`,
 			)
@@ -38,8 +51,10 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 			}
 
 			logging.SetBackend(backend)
-			yqlib.XmlPreferences.AttributePrefix = xmlAttributePrefix
-			yqlib.XmlPreferences.ContentName = xmlContentName
+			yqlib.InitExpressionParser()
+			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
+			yqlib.XMLPreferences.ContentName = xmlContentName
+			yqlib.XMLPreferences.StrictMode = xmlStrictMode
 		},
 	}
 
@@ -51,28 +66,35 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 		panic(err)
 	}
 
-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p] output format type.")
-	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|xml|x] input format type.")
+	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().BoolVar(&xmlStrictMode, "xml-strict-mode", false, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
+	rootCmd.PersistentFlags().BoolVar(&xmlKeepNamespace, "xml-keep-namespace", true, "enables keeping namespace after parsing attributes")
+	rootCmd.PersistentFlags().BoolVar(&xmlUseRawToken, "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().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.")
+	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")
 
 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
-	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace of first yaml file given.")
-	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file inplace of first file given.")
+	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")
 
 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
 	rootCmd.PersistentFlags().StringVarP(&frontMatter, "front-matter", "f", "", "(extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression. This is a workaround for go-yaml to persist header content properly.")
+	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().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

@@ -7,9 +7,10 @@ import (
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
+	"gopkg.in/op/go-logging.v1"
 )
 
-func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
+func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	cmd.SilenceUsage = true
 
 	fileInfo, _ := os.Stdout.Stat()
@@ -18,11 +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
@@ -30,19 +37,23 @@ 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) {
@@ -51,25 +62,116 @@ func configureDecoder() (yqlib.Decoder, error) {
 		return nil, err
 	}
 	switch yqlibInputFormat {
-	case yqlib.XmlInputFormat:
-		return yqlib.NewXmlDecoder(xmlAttributePrefix, xmlContentName), nil
+	case yqlib.XMLInputFormat:
+		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName, xmlStrictMode, xmlKeepNamespace, xmlUseRawToken), 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
 }
 
-func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) yqlib.PrinterWriter {
+func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yqlib.PrinterWriter, error) {
 
 	var printerWriter yqlib.PrinterWriter
 
 	if splitFileExp != "" {
 		colorsEnabled = forceColor
-		splitExp, err := yqlib.NewExpressionParser().ParseExpression(splitFileExp)
+		splitExp, err := yqlib.ExpressionParser.ParseExpression(splitFileExp)
 		if err != nil {
-			return nil
+			return nil, fmt.Errorf("bad split document expression: %w", err)
 		}
 		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
 	} else {
 		printerWriter = yqlib.NewSinglePrinterWriter(out)
 	}
-	return printerWriter
+	return printerWriter, nil
+}
+
+func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
+	switch format {
+	case yqlib.JSONOutputFormat:
+		return yqlib.NewJSONEncoder(indent, colorsEnabled)
+	case yqlib.PropsOutputFormat:
+		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)
+	case yqlib.XMLOutputFormat:
+		return yqlib.NewXMLEncoder(indent, xmlAttributePrefix, xmlContentName)
+	}
+	panic("invalid encoder")
+}
+
+// this is a hack to enable backwards compatibility with githubactions (which pipe /dev/null into everything)
+// and being able to call yq with the filename as a single parameter
+//
+// without this - yq detects there is stdin (thanks githubactions),
+// then tries to parse the filename as an expression
+func maybeFile(str string) bool {
+	yqlib.GetLogger().Debugf("checking '%v' is a file", str)
+	stat, err := os.Stat(str) // #nosec
+	result := err == nil && !stat.IsDir()
+	if yqlib.GetLogger().IsEnabledFor(logging.DEBUG) {
+		if err != nil {
+			yqlib.GetLogger().Debugf("error: %v", err)
+		} else {
+			yqlib.GetLogger().Debugf("error: %v, dir: %v", err, stat.IsDir())
+		}
+		yqlib.GetLogger().Debugf("result: %v", result)
+	}
+	return result
+}
+
+func processStdInArgs(args []string) []string {
+	stat, _ := 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
+	}
+
+	for _, arg := range args {
+		if arg == "-" {
+			return args
+		}
+	}
+	yqlib.GetLogger().Debugf("missing '-', adding it to the end")
+
+	// we're piping from stdin, but there's no '-' arg
+	// lets add one to the end
+	return append(args, "-")
+}
+
+func processArgs(originalArgs []string) (string, []string, error) {
+	expression := forceExpression
+	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, nil
 }

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.16.2"
+	Version = "4.28.1"
 
 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release

debian/changelog

@@ -1,3 +1,112 @@
+yq (4.16.2) focal; urgency=medium
+
+  * Fixed with semicolon space issue
+  * Updating with documentation
+  * Added STDIN example to the top
+  * minor readme cleanup
+  * Help text tweak
+  * Fixed docker timeout - simplify docker builds
+  * New release with docker build fixes
+  * Updating to go 1.17 to fix CVE #944
+  * Fix a typo in root.go
+  * Skip the tests if the nocheck Debian build option is specified
+  * Fixed select bug (#958)
+  * Sped up explode operator
+  * Slight performance improvement to context.ChildContext
+  * Speed up multiply
+  * Update README with recently added / changed options
+  * Make deepMatch report in linear time
+  * Removed leadingContentPreProcessing flag - header preprocessing is stable
+  * Revert "Removed leadingContentPreProcessing flag - header preprocessing is stable"
+  * Keep flag, it is needed in corner cases
+  * Updated Readme
+  * Man page
+  * Fixed expression parsing bug #970
+  * Bumping go-lang, docker versions
+  * Added test release flow
+  * Updated github action release to generate man page
+  * Bumping version
+  * Removing no longer needed github action
+  * Added decoder op
+  * Fixed newline handling when decoding/encoding
+  * Fixed newline handling in encoder/decoder
+  * Can specify indent in encode ops
+  * Added group_by operator
+  * Added flatten operator
+  * Fixed flatten error message
+  * Improving docs
+  * Split printer
+  * Refactored command logic
+  * Fix JSON encoding removing null #985
+  * Fixed acceptance tests
+  * gitbook
+  * Update document generation script
+  * Updating README
+  * Updating release instructions
+  * github action no longer uses data1.yml
+  * Create dependabot.yml
+  * Bump actions/create-release from 1.0.0 to 1.1.4
+  * Bump actions/setup-go from 1 to 2.1.4
+  * Bump github.com/goccy/go-yaml from 1.8.9 to 1.9.4
+  * Bump github.com/jinzhu/copier from 0.2.8 to 0.3.2
+  * Bump github.com/fatih/color from 1.10.0 to 1.13.0
+  * Bump github.com/spf13/cobra from 1.1.3 to 1.2.1
+  * Update dependabot.yml
+  * Update go.yml
+  * add build check to PRs
+  * Include secure as part of build process
+  * Fixing bad label in github action
+  * fixed printer test
+  * remove leading content indicator
+  * Fixed header preprocessing!
+  * lint : define golangci configuration file
+  * Update check.sh
+  * Load file acceptance test
+  * Minor improvement on handling front matter
+  * Improved load doc
+  * feature: detect MANPATh and install there
+  * Update install-man-page.sh
+  * simplify prod stage, move version label to action
+  * add labels, quote some values
+  * enable errorlint linter
+  * Added errorlint to devtools
+  * Added key operator
+  * Added more tests
+  * Fixing comments
+  * Attempt to fix golint problem
+  * Include version query for tools
+  * Clean up errored file?
+  * enable misspell linter
+  * updated readme
+  * update Golangci version to v1.43.0
+  * gci linter
+  * Better merge array by key example
+  * Added credit for merge by array example
+  * Better formatting of merge arrays example
+  * Better merge example
+  * Add accessor for the yq logger instance (#1013)
+  * Fixed collect op when working with multiple nodes
+  * Added map, map_values
+  * Add support for Podman as well as Docker (#1026)
+  * Bump github.com/jinzhu/copier from 0.3.2 to 0.3.4 (#1027)
+  * Added csv, tsv output formats
+  * Added encoder tests
+  * Cleanup test
+  * Fixed docker permission issue #1014
+  * Recording release notes for next release
+  * Assignment op no longer clobbers anchor (#1029)
+  * Added sort_by operator
+  * Improved error message
+  * Improved tips and tricks
+  * Report while filename failed to parse #1030
+  * Added script for extracting checksums
+  * Improved extract-checksum.sh
+  * Bump github.com/spf13/cobra from 1.2.1 to 1.3.0 (#1039)
+  * enable more linters (#1043)
+  * Bump golang compiler #1037
+
+ -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 21 Dec 2021 09:41:44 +0000
+
 yq (4.13.0) focal; urgency=medium
 
   * New `with` operator for making multiple changes to a given path

debian/control

@@ -3,7 +3,8 @@ Section: devel
 Priority: optional
 Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Build-Depends: debhelper (>=10),
-               golang-1.15,
+               golang-1.17-go,
+               pandoc,
                rsync
 Standards-Version: 4.1.4
 Homepage: https://github.com/mikefarah/yq.git

debian/rules

@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 #
-# Copyright (C) 2018 Roberto Mier Escandón <rmescandon@gmail.com>
+# Copyright (C) 2018-2021 Roberto Mier Escandón <rmescandon@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
@@ -17,20 +17,21 @@
 PROJECT := yq
 OWNER := mikefarah
 REPO := github.com
-GOVERSION := 1.15
 
 export DH_OPTIONS
 export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
-export GOROOT := /usr/lib/go-${GOVERSION}
+export GOROOT := /usr/local/go
 export GOPATH := ${CURDIR}/_build
 export GOBIN := ${GOPATH}/bin
 export PATH := ${GOROOT}/bin:${GOBIN}:${PATH}
 export GOCACHE := /tmp/gocache
 export GOFLAGS := -mod=vendor
+export GO111MODULE := on
 
 SRCDIR := ${GOPATH}/src/${DH_GOPKG}
 DESTDIR := ${CURDIR}/debian/${PROJECT}
 BINDIR := /usr/bin
+MANDIR := /usr/share/man/man1/
 ASSETSDIR := /usr/share/${PROJECT}
 
 %:
@@ -42,7 +43,17 @@ override_dh_auto_build:
 	# copy project to local srcdir to build from there
 	rsync -avz --progress --exclude=_build --exclude=debian --exclude=tmp. --exclude=go.mod --exclude=docs . $(SRCDIR)
 	# build go code
-	(cd ${SRCDIR} && go install -buildmode=pie ./...)
+	( \
+		cd ${SRCDIR} && \
+		go install -buildmode=pie ./... \
+	)
+
+	# build man page
+	( \
+		cd ${SRCDIR} && \
+		./scripts/generate-man-page-md.sh && \
+		./scripts/generate-man-page.sh \
+	)
 	
 override_dh_auto_test:
 ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
@@ -54,6 +65,10 @@ override_dh_auto_install:
 	cp -f ${SRCDIR}/LICENSE ${DESTDIR}/${ASSETSDIR}
 	chmod a+x ${DESTDIR}/${BINDIR}/yq
 
+	# man
+	mkdir -p "${DESTDIR}"/"${MANDIR}"
+	cp "${SRCDIR}"/yq.1 "${DESTDIR}"/"${MANDIR}" \
+
 override_dh_auto_clean:
 	dh_clean
 	rm -rf ${CURDIR}/_build

examples/base64.txt

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

examples/data1.yaml

@@ -1,15 +1,5 @@
-strings:
-  - a: banana
-  - a: cat
-  - a: apple
-
-numbers:
-  - a: 12
-  - a: 13
-  - a: 120
-
-
-obj:
-  - a: {cat: "adog"}
-  - a: {cat: "doga"}
-  - a: apple
+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/example.properties

@@ -0,0 +1,6 @@
+# comments on values appear
+person.name = Mike
+
+# comments on array values appear
+person.pets.0 = cat
+person.food.0 = pizza

examples/mike.xml

@@ -1,2 +1,14 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<cat legs="4">BiBi</cat>
+<!-- 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 -->

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

@@ -1,27 +1,31 @@
 module github.com/mikefarah/yq/v4
 
 require (
-	github.com/elliotchance/orderedmap v1.4.0
+	github.com/a8m/envsubst v1.3.0
+	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-yaml v1.9.4
-	github.com/jinzhu/copier v0.3.4
-	github.com/magiconair/properties v1.8.5
-	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/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 v1.8.6
+	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
+	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

@@ -1,792 +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=
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-google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
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-google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
-google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
-google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
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-google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
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-google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
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-google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
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-google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
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-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=
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-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
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+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=
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 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=
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-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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-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

merge-array-by-key.sh

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

pkg/yqlib/all_at_once_evaluator.go

@@ -19,11 +19,11 @@ type Evaluator interface {
 
 type allAtOnceEvaluator struct {
 	treeNavigator DataTreeNavigator
-	treeCreator   ExpressionParser
 }
 
 func NewAllAtOnceEvaluator() Evaluator {
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
+	InitExpressionParser()
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
 }
 
 func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error) {
@@ -35,7 +35,7 @@ func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Nod
 }
 
 func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
-	node, err := e.treeCreator.ParseExpression(expression)
+	node, err := ExpressionParser.ParseExpression(expression)
 	if err != nil {
 		return nil, err
 	}

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) {
@@ -136,7 +155,12 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 		n.Node.Value = ""
 	}
 	n.Node.Kind = other.Node.Kind
-	n.Node.Tag = other.Node.Tag
+
+	// don't clobber custom tags...
+	if prefs.ClobberCustomTags || strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+		n.Node.Tag = other.Node.Tag
+	}
+
 	n.Node.Alias = other.Node.Alias
 
 	if !prefs.DontOverWriteAnchor {
@@ -145,6 +169,7 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes
+
 	if n.Node.Style == 0 {
 		n.Node.Style = other.Node.Style
 	}
@@ -152,6 +177,9 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	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/context.go

@@ -3,6 +3,7 @@ package yqlib
 import (
 	"container/list"
 	"fmt"
+	"time"
 
 	"github.com/jinzhu/copier"
 	logging "gopkg.in/op/go-logging.v1"
@@ -12,6 +13,7 @@ type Context struct {
 	MatchingNodes  *list.List
 	Variables      map[string]*list.List
 	DontAutoCreate bool
+	datetimeLayout string
 }
 
 func (n *Context) SingleReadonlyChildContext(candidate *CandidateNode) Context {
@@ -28,6 +30,17 @@ func (n *Context) SingleChildContext(candidate *CandidateNode) Context {
 	return n.ChildContext(list)
 }
 
+func (n *Context) SetDateTimeLayout(newDateTimeLayout string) {
+	n.datetimeLayout = newDateTimeLayout
+}
+
+func (n *Context) GetDateTimeLayout() string {
+	if n.datetimeLayout != "" {
+		return n.datetimeLayout
+	}
+	return time.RFC3339
+}
+
 func (n *Context) GetVariable(name string) *list.List {
 	if n.Variables == nil {
 		return nil
@@ -43,7 +56,7 @@ func (n *Context) SetVariable(name string, value *list.List) {
 }
 
 func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{DontAutoCreate: n.DontAutoCreate}
+	clone := Context{DontAutoCreate: n.DontAutoCreate, datetimeLayout: n.datetimeLayout}
 	clone.Variables = make(map[string]*list.List)
 	if len(n.Variables) > 0 {
 		err := copier.Copy(&clone.Variables, n.Variables)

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(), NewCsvEncoder(',')), s.description)
+	case "encode-tsv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(), NewCsvEncoder('\t')), s.description)
+	case "decode-csv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewYamlEncoder(2, false, true, true)), s.description)
+	case "decode-tsv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder('\t'), NewYamlEncoder(2, false, true, true)), 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, true, true))),
+	)
+}
+
+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(), 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

@@ -0,0 +1,44 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type InputFormat uint
+
+const (
+	YamlInputFormat = 1 << iota
+	XMLInputFormat
+	PropertiesInputFormat
+	Base64InputFormat
+	JsonInputFormat
+	CSVObjectInputFormat
+	TSVObjectInputFormat
+)
+
+type Decoder interface {
+	Init(reader io.Reader)
+	Decode(node *yaml.Node) error
+}
+
+func InputFormatFromString(format string) (InputFormat, error) {
+	switch format {
+	case "yaml", "y":
+		return YamlInputFormat, nil
+	case "xml", "x":
+		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 +1,53 @@
+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) {
+	dec.reader = reader
+	dec.readAnything = false
+	dec.finished = false
+}
+
+func (dec *base64Decoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	base64Reader := base64.NewDecoder(&dec.encoding, dec.reader)
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(base64Reader); err != nil {
+		return 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 io.EOF
+		}
+	}
+	dec.readAnything = true
+	rootYamlNode.Kind = yaml.ScalarNode
+	rootYamlNode.Tag = "!!str"
+	rootYamlNode.Value = buf.String()
+	return nil
+}

pkg/yqlib/decoder_csv_object.go

@@ -0,0 +1,80 @@
+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) {
+	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
+}
+
+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(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	headerRow, err := dec.reader.Read()
+	log.Debugf(": headerRow%v", headerRow)
+	if err != nil {
+		return 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 err
+	}
+
+	log.Debugf("finished, contentRow%v", contentRow)
+	log.Debugf("err: %v", err)
+
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{rootArray}
+	return nil
+}

pkg/yqlib/decoder_json.go

@@ -0,0 +1,82 @@
+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) {
+	dec.decoder = *json.NewDecoder(reader)
+}
+
+func (dec *jsonDecoder) Decode(rootYamlNode *yaml.Node) error {
+
+	var dataBucket orderedMap
+	log.Debug("going to decode")
+	err := dec.decoder.Decode(&dataBucket)
+	if err != nil {
+		return err
+	}
+	node, err := dec.convertToYamlNode(&dataBucket)
+
+	if err != nil {
+		return err
+	}
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{node}
+	return 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

@@ -0,0 +1,122 @@
+package yqlib
+
+import (
+	"bytes"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/magiconair/properties"
+	"gopkg.in/yaml.v3"
+)
+
+type propertiesDecoder struct {
+	reader   io.Reader
+	finished bool
+	d        DataTreeNavigator
+}
+
+func NewPropertiesDecoder() Decoder {
+	return &propertiesDecoder{d: NewDataTreeNavigator(), finished: false}
+}
+
+func (dec *propertiesDecoder) Init(reader io.Reader) {
+	dec.reader = reader
+	dec.finished = false
+}
+
+func parsePropKey(key string) []interface{} {
+	pathStrArray := strings.Split(key, ".")
+	path := make([]interface{}, len(pathStrArray))
+	for i, pathStr := range pathStrArray {
+		num, err := strconv.ParseInt(pathStr, 10, 32)
+		if err == nil {
+			path[i] = num
+		} else {
+			path[i] = pathStr
+		}
+	}
+	return path
+}
+
+func (dec *propertiesDecoder) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	return "# " + c
+}
+
+func (dec *propertiesDecoder) applyProperty(properties *properties.Properties, context Context, key string) error {
+	value, _ := properties.Get(key)
+	path := parsePropKey(key)
+
+	rhsNode := &yaml.Node{
+		Value:       value,
+		Tag:         "!!str",
+		Kind:        yaml.ScalarNode,
+		LineComment: dec.processComment(properties.GetComment(key)),
+	}
+
+	rhsNode.Tag = guessTagFromCustomType(rhsNode)
+
+	rhsCandidateNode := &CandidateNode{
+		Path: path,
+		Node: rhsNode,
+	}
+
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+
+	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := dec.d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
+func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(dec.reader); err != nil {
+		return err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+		return io.EOF
+	}
+	properties, err := properties.LoadString(buf.String())
+	if err != nil {
+		return err
+	}
+	properties.DisableExpansion = true
+
+	rootMap := &CandidateNode{
+		Node: &yaml.Node{
+			Kind: yaml.MappingNode,
+			Tag:  "!!map",
+		},
+	}
+
+	context := Context{}
+	context = context.SingleChildContext(rootMap)
+
+	for _, key := range properties.Keys() {
+		if err := dec.applyProperty(properties, context, key); err != nil {
+			return err
+		}
+
+	}
+
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{rootMap.Node}
+	dec.finished = true
+	return nil
+
+}

pkg/yqlib/decoder_test.go

@@ -0,0 +1,60 @@
+package yqlib
+
+import (
+	"bufio"
+	"bytes"
+	"strings"
+)
+
+type formatScenario struct {
+	input          string
+	indent         int
+	expression     string
+	expected       string
+	description    string
+	subdescription string
+	skipDoc        bool
+	scenarioType   string
+}
+
+func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) string {
+
+	var output bytes.Buffer
+	writer := bufio.NewWriter(&output)
+
+	if decoder == nil {
+		decoder = NewYamlDecoder()
+	}
+
+	inputs, err := readDocuments(strings.NewReader(s.input), "sample.yml", 0, decoder)
+	if err != nil {
+		panic(err)
+	}
+
+	expression := s.expression
+	if expression == "" {
+		expression = "."
+	}
+
+	exp, err := getExpressionParser().ParseExpression(expression)
+
+	if err != nil {
+		panic(err)
+	}
+
+	context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: inputs}, exp)
+
+	if err != nil {
+		panic(err)
+	}
+
+	printer := NewPrinter(encoder, NewSinglePrinterWriter(writer))
+	err = printer.PrintResults(context.MatchingNodes)
+	if err != nil {
+		panic(err)
+	}
+	writer.Flush()
+
+	return output.String()
+
+}

pkg/yqlib/decoder_xml.go

@@ -2,53 +2,48 @@ package yqlib
 
 import (
 	"encoding/xml"
-	"fmt"
+	"errors"
 	"io"
+	"strings"
 	"unicode"
 
 	"golang.org/x/net/html/charset"
 	yaml "gopkg.in/yaml.v3"
 )
 
-type InputFormat uint
-
-const (
-	YamlInputFormat = 1 << iota
-	XmlInputFormat
-)
-
-func InputFormatFromString(format string) (InputFormat, error) {
-	switch format {
-	case "yaml", "y":
-		return YamlInputFormat, nil
-	case "xml", "x":
-		return XmlInputFormat, nil
-	default:
-		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml]", format)
-	}
-}
-
 type xmlDecoder struct {
 	reader          io.Reader
+	readAnything    bool
 	attributePrefix string
-	contentPrefix   string
+	contentName     string
+	strictMode      bool
+	keepNamespace   bool
+	useRawToken     bool
 	finished        bool
 }
 
-func NewXmlDecoder(attributePrefix string, contentPrefix string) Decoder {
-	if contentPrefix == "" {
-		contentPrefix = "content"
+func NewXMLDecoder(attributePrefix string, contentName string, strictMode bool, keepNamespace bool, useRawToken bool) Decoder {
+	if contentName == "" {
+		contentName = "content"
+	}
+	return &xmlDecoder{
+		attributePrefix: attributePrefix,
+		contentName:     contentName,
+		finished:        false,
+		strictMode:      strictMode,
+		keepNamespace:   keepNamespace,
+		useRawToken:     useRawToken,
 	}
-	return &xmlDecoder{attributePrefix: attributePrefix, contentPrefix: contentPrefix, finished: false}
 }
 
 func (dec *xmlDecoder) Init(reader io.Reader) {
 	dec.reader = reader
+	dec.readAnything = false
 	dec.finished = false
 }
 
 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 {
@@ -60,20 +55,41 @@ func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
 	return yamlNode, nil
 }
 
+func (dec *xmlDecoder) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	return "#" + strings.TrimRight(c, " ")
+}
+
 func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
-	yamlNode := &yaml.Node{Kind: yaml.MappingNode, HeadComment: n.Comment}
+	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 
 	if len(n.Data) > 0 {
-		label := dec.contentPrefix
-		yamlNode.Content = append(yamlNode.Content, createScalarNode(label, label), createScalarNode(n.Data, n.Data))
+		label := dec.contentName
+		labelNode := createScalarNode(label, label)
+		labelNode.HeadComment = dec.processComment(n.HeadComment)
+		labelNode.FootComment = dec.processComment(n.FootComment)
+		yamlNode.Content = append(yamlNode.Content, labelNode, createScalarNode(n.Data, n.Data))
 	}
 
-	for _, keyValuePair := range n.Children {
+	for i, keyValuePair := range n.Children {
 		label := keyValuePair.K
 		children := keyValuePair.V
 		labelNode := createScalarNode(label, label)
 		var valueNode *yaml.Node
 		var err error
+
+		if i == 0 {
+			labelNode.HeadComment = dec.processComment(n.HeadComment)
+
+		}
+
+		// 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 {
 			valueNode, err = dec.createSequence(children)
@@ -81,6 +97,13 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 				return nil, err
 			}
 		} else {
+			// comment hack for maps of scalars
+			// if the value is a scalar, the head comment of the scalar needs to go on the key?
+			// add tests for <z/> as well as multiple <ds> of inputXmlWithComments > yaml
+			if len(children[0].Children) == 0 && children[0].HeadComment != "" {
+				labelNode.HeadComment = labelNode.HeadComment + "\n" + strings.TrimSpace(children[0].HeadComment)
+				children[0].HeadComment = ""
+			}
 			valueNode, err = dec.convertToYamlNode(children[0])
 			if err != nil {
 				return nil, err
@@ -97,7 +120,14 @@ func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
 		return dec.createMap(n)
 	}
 	scalar := createScalarNode(n.Data, n.Data)
-	scalar.HeadComment = n.Comment
+	if n.Data == "" {
+		scalar = createScalarNode(nil, "")
+	}
+	log.Debug("scalar headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	scalar.HeadComment = dec.processComment(n.HeadComment)
+	scalar.LineComment = dec.processComment(n.LineComment)
+	scalar.FootComment = dec.processComment(n.FootComment)
+
 	return scalar, nil
 }
 
@@ -107,7 +137,7 @@ func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
 	}
 	root := &xmlNode{}
 	// cant use xj - it doesn't keep map order.
-	err := dec.decodeXml(root)
+	err := dec.decodeXML(root)
 
 	if err != nil {
 		return err
@@ -116,7 +146,13 @@ func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
 
 	if err != nil {
 		return err
+	} else if firstNode.Tag == "!!null" {
+		dec.finished = true
+		if dec.readAnything {
+			return io.EOF
+		}
 	}
+	dec.readAnything = true
 	rootYamlNode.Kind = yaml.DocumentNode
 	rootYamlNode.Content = []*yaml.Node{firstNode}
 	dec.finished = true
@@ -124,14 +160,17 @@ func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
 }
 
 type xmlNode struct {
-	Children []*xmlChildrenKv
-	Comment  string
-	Data     string
+	Children    []*xmlChildrenKv
+	HeadComment string
+	FootComment string
+	LineComment string
+	Data        string
 }
 
 type xmlChildrenKv struct {
-	K string
-	V []*xmlNode
+	K           string
+	V           []*xmlNode
+	FootComment string
 }
 
 // AddChild appends a node to the list of children
@@ -158,14 +197,15 @@ type element struct {
 	parent *element
 	n      *xmlNode
 	label  string
+	state  string
 }
 
 // this code is heavily based on https://github.com/basgys/goxml2json
 // main changes are to decode into a structure that preserves the original order
 // of the map keys.
-func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
+func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 	xmlDec := xml.NewDecoder(dec.reader)
-
+	xmlDec.Strict = dec.strictMode
 	// That will convert the charset if the provided XML is non-UTF-8
 	xmlDec.CharsetReader = charset.NewReaderLabel
 
@@ -175,14 +215,26 @@ func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
 		n:      root,
 	}
 
+	getToken := func() (xml.Token, error) {
+		if dec.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
 		}
 
 		switch se := t.(type) {
 		case xml.StartElement:
+			log.Debug("start element %v", se.Name.Local)
+			elem.state = "started"
 			// Build new a new current element and link it to its parent
 			elem = &element{
 				parent: elem,
@@ -192,12 +244,23 @@ func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
 
 			// Extract attributes as children
 			for _, a := range se.Attr {
+				if dec.keepNamespace {
+					if a.Name.Space != "" {
+						a.Name.Local = a.Name.Space + ":" + a.Name.Local
+					}
+				}
 				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
 			}
 		case xml.CharData:
 			// Extract XML data (if any)
 			elem.n.Data = trimNonGraphic(string(se))
+			if elem.n.Data != "" {
+				elem.state = "chardata"
+				log.Debug("chardata [%v] for %v", elem.n.Data, elem.label)
+			}
 		case xml.EndElement:
+			log.Debug("end element %v", elem.label)
+			elem.state = "finished"
 			// And add it to its parent list
 			if elem.parent != nil {
 				elem.parent.n.AddChild(elem.label, elem.n)
@@ -206,13 +269,49 @@ func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
 			// Then change the current element to its parent
 			elem = elem.parent
 		case xml.Comment:
-			elem.n.Comment = trimNonGraphic(string(xml.CharData(se)))
+
+			commentStr := string(xml.CharData(se))
+			if elem.state == "started" {
+				applyFootComment(elem, commentStr)
+
+			} else if elem.state == "chardata" {
+				log.Debug("got a line comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.LineComment = joinFilter([]string{elem.n.LineComment, commentStr})
+			} else {
+				log.Debug("got a head comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.HeadComment = joinFilter([]string{elem.n.HeadComment, commentStr})
+			}
+
 		}
 	}
 
 	return nil
 }
 
+func applyFootComment(elem *element, commentStr string) {
+
+	// first lets try to put the comment on the last child
+	if len(elem.n.Children) > 0 {
+		lastChildIndex := len(elem.n.Children) - 1
+		childKv := elem.n.Children[lastChildIndex]
+		log.Debug("got a foot comment for %v: [%v]", childKv.K, commentStr)
+		childKv.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	} else {
+		log.Debug("got a foot comment for %v: [%v]", elem.label, commentStr)
+		elem.n.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	}
+}
+
+func joinFilter(rawStrings []string) string {
+	stringsToJoin := make([]string, 0)
+	for _, str := range rawStrings {
+		if str != "" {
+			stringsToJoin = append(stringsToJoin, str)
+		}
+	}
+	return strings.Join(stringsToJoin, " ")
+}
+
 // trimNonGraphic returns a slice of the string s, with all leading and trailing
 // non graphic characters and spaces removed.
 //

pkg/yqlib/decoder_yaml.go

@@ -6,11 +6,6 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
-type Decoder interface {
-	Init(reader io.Reader)
-	Decode(node *yaml.Node) error
-}
-
 type yamlDecoder struct {
 	decoder yaml.Decoder
 }

pkg/yqlib/doc/notification-snippet.md

@@ -0,0 +1,6 @@
+
+{% 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

@@ -4,31 +4,16 @@ Add behaves differently according to the type of the LHS:
 * arrays: concatenate
 * number scalars: arithmetic addition
 * string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)
 
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
-## Concatenate and assign arrays
-Given a sample.yml file of:
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-```
-then
-```bash
-yq eval '.a.b += ["cow"]' sample.yml
-```
-will output
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-    - cow
-```
+
+{% 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:
@@ -42,7 +27,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a + .b' sample.yml
+yq '.a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -52,6 +37,28 @@ will output
 - 4
 ```
 
+## Concatenate to existing array
+Note that the styling of `a` is kept.
+
+Given a sample.yml file of:
+```yaml
+a: [1,2]
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: [1, 2, 3, 4]
+b:
+  - 3
+  - 4
+```
+
 ## Concatenate null to array
 Given a sample.yml file of:
 ```yaml
@@ -61,7 +68,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + null' sample.yml
+yq '.a + null' sample.yml
 ```
 will output
 ```yaml
@@ -69,6 +76,22 @@ will output
 - 2
 ```
 
+## Append to existing array
+Note that the styling is copied from existing array elements
+
+Given a sample.yml file of:
+```yaml
+a: ['dog']
+```
+then
+```bash
+yq '.a += "cat"' sample.yml
+```
+will output
+```yaml
+a: ['dog', 'cat']
+```
+
 ## Add new object to array
 Given a sample.yml file of:
 ```yaml
@@ -77,7 +100,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
+yq '.a + {"cat": "meow"}' sample.yml
 ```
 will output
 ```yaml
@@ -85,76 +108,6 @@ will output
 - cat: meow
 ```
 
-## Add string to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + "hello"' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- hello
-```
-
-## Append to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
-## Append another array using +=
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a += .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
 ## Relative append
 Given a sample.yml file of:
 ```yaml
@@ -169,7 +122,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
+yq '.a[].b += ["mouse"]' sample.yml
 ```
 will output
 ```yaml
@@ -182,7 +135,9 @@ a:
     b:
       - dog
       - mouse
-  a3: {b: [mouse]}
+  a3:
+    b:
+      - mouse
 ```
 
 ## String concatenation
@@ -193,7 +148,7 @@ b: meow
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a += .b' sample.yml
 ```
 will output
 ```yaml
@@ -211,7 +166,7 @@ b: 4.9
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +184,7 @@ b: 4
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +200,7 @@ b: 5
 ```
 then
 ```bash
-yq eval '.[] += 1' sample.yml
+yq '.[] += 1' sample.yml
 ```
 will output
 ```yaml
@@ -253,15 +208,118 @@ a: 4
 b: 6
 ```
 
+## Date addition
+You can add durations to dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+
+Given a sample.yml file of:
+```yaml
+a: 2021-01-01T00:00:00Z
+```
+then
+```bash
+yq '.a += "3h10m"' sample.yml
+```
+will output
+```yaml
+a: 2021-01-01T03:10:00Z
+```
+
+## Date addition - custom format
+You can add durations to dates. See [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST", .a += "3h1m")' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 6:00AM GMT
+```
+
 ## Add to null
 Adding to null simply returns the rhs
 
 Running
 ```bash
-yq eval --null-input 'null + "cat"'
+yq --null-input 'null + "cat"'
 ```
 will output
 ```yaml
 cat
 ```
 
+## Add maps to shallow merge
+Adding objects together shallow merges them. Use `*` to deeply merge.
+
+Given a sample.yml file of:
+```yaml
+a:
+  thing:
+    name: Astuff
+    value: x
+  a1: cool
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a:
+  thing:
+    name: Bstuff
+    legs: 3
+  a1: cool
+  b1: neat
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+
+## Custom types: that are really strings
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse cat
+b: !goat _meow
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse cat_meow
+b: !goat _meow
+```
+
+## Custom types: that are really numbers
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse 1.2
+b: !goat 2.3
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse 3.5
+b: !goat 2.3
+```
+

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

@@ -2,6 +2,12 @@
 
 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
@@ -9,7 +15,7 @@ a: bridge
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +29,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +43,7 @@ a: ~
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +57,7 @@ a: false
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -66,10 +72,43 @@ b: cat
 ```
 then
 ```bash
-yq eval '.a // .b' sample.yml
+yq '.a // .b' sample.yml
 ```
 will output
 ```yaml
 cat
 ```
 
+## Update or create - entity exists
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+a: 1
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+a: 2
+```
+
+## Update or create - entity does not exist
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+b: camel
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+b: camel
+a: 1
+```
+

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

@@ -5,6 +5,12 @@ 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
 
@@ -25,7 +31,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -55,7 +61,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +93,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -103,7 +109,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq eval '.a | anchor' sample.yml
+yq '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -117,7 +123,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a anchor = "foobar"' sample.yml
+yq '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +138,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a anchor |= .b' sample.yml
+yq '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +154,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq eval '.a | alias' sample.yml
+yq '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +169,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = "meow"' sample.yml
+yq '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -179,7 +185,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = ""' sample.yml
+yq '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -196,7 +202,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a alias |= .f' sample.yml
+yq '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -213,7 +219,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +235,7 @@ a: mike
 ```
 then
 ```bash
-yq eval 'explode(.a)' sample.yml
+yq 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +251,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -278,7 +284,7 @@ foobar:
 ```
 then
 ```bash
-yq eval 'explode(.)' sample.yml
+yq 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -317,7 +323,7 @@ thingTwo:
 ```
 then
 ```bash
-yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
+yq '.thingOne |= explode(.) * {"value": false}' sample.yml
 ```
 will output
 ```yaml

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

@@ -7,10 +7,21 @@ 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.
+
+
+### Flags
+- `c` clobber custom tags
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Create yaml file
 Running
 ```bash
-yq eval --null-input '.a.b = "cat" | .x = "frog"'
+yq --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -28,7 +39,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a |= .b' sample.yml
+yq '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +56,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] |= . * 2' sample.yml
+yq '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -84,7 +95,7 @@ b: sibling
 ```
 then
 ```bash
-yq eval '.a = .b' sample.yml
+yq '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -101,13 +112,13 @@ c: fieldC
 ```
 then
 ```bash
-yq eval '(.a, .c) = "potatoe"' sample.yml
+yq '(.a, .c) = "potato"' sample.yml
 ```
 will output
 ```yaml
-a: potatoe
+a: potato
 b: fieldB
-c: potatoe
+c: potato
 ```
 
 ## Update string value
@@ -118,7 +129,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b = "frog"' sample.yml
+yq '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -136,7 +147,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b |= "frog"' sample.yml
+yq '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -145,7 +156,7 @@ a:
 ```
 
 ## Update deeply selected results
-Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.
+Note that the LHS is wrapped in brackets! This is to ensure we don't first filter out the yaml and then update the snippet.
 
 Given a sample.yml file of:
 ```yaml
@@ -155,7 +166,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -173,7 +184,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -189,11 +200,12 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b |= "bogs"' sample.yml
+yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: bogs}}
+a:
+  b: bogs
 ```
 
 ## Update node value that has an anchor
@@ -205,7 +217,7 @@ a: &cool cat
 ```
 then
 ```bash
-yq eval '.a = "dog"' sample.yml
+yq '.a = "dog"' sample.yml
 ```
 will output
 ```yaml
@@ -219,10 +231,46 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b.[0] |= "bogs"' sample.yml
+yq '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: [bogs]}}
+a:
+  b:
+    - bogs
+```
+
+## Custom types are maintained by default
+Given a sample.yml file of:
+```yaml
+a: !cat meow
+b: !dog woof
+```
+then
+```bash
+yq '.a = .b' sample.yml
+```
+will output
+```yaml
+a: !cat woof
+b: !dog woof
+```
+
+## Custom types: 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

@@ -10,10 +10,22 @@ 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.
 
+## 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)
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## `or` example
 Running
 ```bash
-yq eval --null-input 'true or false'
+yq --null-input 'true or false'
 ```
 will output
 ```yaml
@@ -23,7 +35,7 @@ true
 ## `and` example
 Running
 ```bash
-yq eval --null-input 'true and false'
+yq --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -42,7 +54,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +72,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +86,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +105,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
+yq '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +121,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -123,7 +135,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -142,7 +154,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
+yq '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -153,7 +165,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq eval --null-input 'true | not'
+yq --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -163,7 +175,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq eval --null-input 'false | not'
+yq --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -173,7 +185,7 @@ true
 ## String values considered to be true
 Running
 ```bash
-yq eval --null-input '"cat" | not'
+yq --null-input '"cat" | not'
 ```
 will output
 ```yaml
@@ -183,7 +195,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq eval --null-input '"" | not'
+yq --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -193,7 +205,7 @@ false
 ## Numbers are considered to be true
 Running
 ```bash
-yq eval --null-input '1 | not'
+yq --null-input '1 | not'
 ```
 will output
 ```yaml
@@ -203,7 +215,7 @@ false
 ## Zero is considered to be true
 Running
 ```bash
-yq eval --null-input '0 | not'
+yq --null-input '0 | not'
 ```
 will output
 ```yaml
@@ -213,7 +225,7 @@ false
 ## Null is considered to be false
 Running
 ```bash
-yq eval --null-input '~ | not'
+yq --null-input '~ | not'
 ```
 will output
 ```yaml

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

@@ -3,10 +3,16 @@
 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
-yq eval --null-input '[]'
+yq --null-input '[]'
 ```
 will output
 ```yaml
@@ -16,7 +22,7 @@ will output
 ## Collect single
 Running
 ```bash
-yq eval --null-input '["cat"]'
+yq --null-input '["cat"]'
 ```
 will output
 ```yaml
@@ -31,7 +37,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '[.a, .b]' sample.yml
+yq '[.a, .b]' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/column.md

@@ -0,0 +1,66 @@
+# Column
+
+Returns the column of the matching node. Starts from 1, 0 indicates there was no column data.
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## 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:
 
@@ -10,20 +10,46 @@ 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
 ```
 then
 ```bash
-yq eval '.a lineComment="single"' sample.yml
+yq '.a line_comment="single"' sample.yml
 ```
 will output
 ```yaml
 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
@@ -32,7 +58,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '.. lineComment |= .' sample.yml
+yq '.. line_comment |= .' sample.yml
 ```
 will output
 ```yaml
@@ -40,6 +66,121 @@ 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
@@ -47,7 +188,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. headComment="single"' sample.yml
+yq '. head_comment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -56,6 +197,25 @@ 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
@@ -63,12 +223,11 @@ a: cat
 ```
 then
 ```bash
-yq eval '. footComment=.a' sample.yml
+yq '. foot_comment=.a' sample.yml
 ```
 will output
 ```yaml
 a: cat
-
 # cat
 ```
 
@@ -80,7 +239,7 @@ b: dog # leave this
 ```
 then
 ```bash
-yq eval '.a lineComment=""' sample.yml
+yq '.a line_comment=""' sample.yml
 ```
 will output
 ```yaml
@@ -99,7 +258,7 @@ b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq '... comments=""' sample.yml
 ```
 will output
 ```yaml
@@ -111,10 +270,11 @@ b:
 Given a sample.yml file of:
 ```yaml
 a: cat # meow
+# have a great day
 ```
 then
 ```bash
-yq eval '.a | lineComment' sample.yml
+yq '.a | line_comment' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +292,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '. | headComment' sample.yml
+yq '. | head_comment' sample.yml
 ```
 will output
 ```yaml
@@ -151,7 +311,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval 'headComment' sample.yml
+yq 'head_comment' sample.yml
 ```
 will output
 ```yaml
@@ -171,7 +331,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '. | footComment' sample.yml
+yq '. | foot_comment' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/compare.md

@@ -0,0 +1,106 @@
+# 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)
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## 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

@@ -2,6 +2,12 @@
 
 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
 
@@ -13,7 +19,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains(["baz", "bar"])' sample.yml
+yq 'contains(["baz", "bar"])' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +38,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains({"bar": [{"barp": 12}]})' sample.yml
+yq 'contains({"bar": [{"barp": 12}]})' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +57,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
+yq 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
 ```
 will output
 ```yaml
@@ -65,7 +71,7 @@ foobar
 ```
 then
 ```bash
-yq eval 'contains("bar")' sample.yml
+yq 'contains("bar")' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +85,7 @@ meow
 ```
 then
 ```bash
-yq eval 'contains("meow")' sample.yml
+yq 'contains("meow")' sample.yml
 ```
 will output
 ```yaml

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

@@ -2,10 +2,16 @@
 
 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
-yq eval --null-input '{}'
+yq --null-input '{}'
 ```
 will output
 ```yaml
@@ -19,7 +25,7 @@ name: Mike
 ```
 then
 ```bash
-yq eval '{"wrap": .}' sample.yml
+yq '{"wrap": .}' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +43,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +66,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -73,10 +79,23 @@ Rosey: sheep
 ## Creating yaml from scratch
 Running
 ```bash
-yq eval --null-input '{"wrap": "frog"}'
+yq --null-input '{"wrap": "frog"}'
 ```
 will output
 ```yaml
 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

@@ -0,0 +1,203 @@
+# Date Time
+
+Various operators for parsing and manipulating dates. 
+
+## Date time formattings
+This uses the golangs built in time library for parsing and formatting date times.
+
+When not specified, the RFC3339 standard is assumed `2006-01-02T15:04:05Z07:00` for parsing.
+
+To specify a custom parsing format, use the `with_dtf` operator. The first parameter sets the datetime parsing format for the expression in the second parameter. The expression can be any valid `yq` expression tree.
+
+```bash
+yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
+```
+
+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 the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
+
+
+## Durations
+Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
+
+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.
+
+Given a sample.yml file of:
+```yaml
+a: 2001-12-15T02:59:43.1Z
+```
+then
+```bash
+yq '.a |= format_datetime("Monday, 02-Jan-06 at 3:04PM")' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM
+```
+
+## Format: from custom date time
+Use with_dtf to set a custom datetime format for parsing.
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM
+```
+then
+```bash
+yq '.a |= with_dtf("Monday, 02-Jan-06 at 3:04PM"; format_datetime("2006-01-02"))' sample.yml
+```
+will output
+```yaml
+a: 2001-12-15
+```
+
+## Format: get the day of the week
+Given a sample.yml file of:
+```yaml
+a: 2001-12-15T02:59:43.1Z
+```
+then
+```bash
+yq '.a | format_datetime("Monday")' sample.yml
+```
+will output
+```yaml
+Saturday
+```
+
+## Now
+Given a sample.yml file of:
+```yaml
+a: cool
+```
+then
+```bash
+yq '.updated = now' sample.yml
+```
+will output
+```yaml
+a: cool
+updated: 2021-05-19T01:02:03Z
+```
+
+## Timezone: from standard RFC3339 format
+Returns a new datetime in the specified timezone. Specify standard IANA Time Zone format or 'utc', 'local'. When given a single parameter, this assumes the datetime is in RFC3339 format.
+
+Given a sample.yml file of:
+```yaml
+a: cool
+```
+then
+```bash
+yq '.updated = (now | tz("Australia/Sydney"))' sample.yml
+```
+will output
+```yaml
+a: cool
+updated: 2021-05-19T11:02:03+10:00
+```
+
+## Timezone: with custom format
+Specify standard IANA Time Zone format or 'utc', 'local'
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq '.a |= with_dtf("Monday, 02-Jan-06 at 3:04PM MST"; tz("Australia/Sydney"))' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 1:59PM AEDT
+```
+
+## Add and tz custom format
+Specify standard IANA Time Zone format or 'utc', 'local'
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq '.a |= with_dtf("Monday, 02-Jan-06 at 3:04PM MST"; tz("Australia/Sydney"))' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 1:59PM AEDT
+```
+
+## Date addition
+Given a sample.yml file of:
+```yaml
+a: 2021-01-01T00:00:00Z
+```
+then
+```bash
+yq '.a += "3h10m"' sample.yml
+```
+will output
+```yaml
+a: 2021-01-01T03:10:00Z
+```
+
+## Date subtraction
+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
+a: 2021-01-01T03:10:00Z
+```
+then
+```bash
+yq '.a -= "3h10m"' sample.yml
+```
+will output
+```yaml
+a: 2021-01-01T00:00:00Z
+```
+
+## Date addition - custom format
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST"; .a += "3h1m")' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 6:00AM GMT
+```
+
+## Date script with custom format
+You can embed full expressions in with_dtf if needed.
+
+Given a sample.yml file of:
+```yaml
+a: Saturday, 15-Dec-01 at 2:59AM GMT
+```
+then
+```bash
+yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST"; .a = (.a + "3h1m" | tz("Australia/Perth")))' sample.yml
+```
+will output
+```yaml
+a: Saturday, 15-Dec-01 at 2:00PM AWST
+```
+

pkg/yqlib/doc/operators/delete.md

@@ -2,6 +2,12 @@
 
 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
@@ -10,7 +16,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.b)' sample.yml
+yq 'del(.b)' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +32,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.a.a1)' sample.yml
+yq 'del(.a.a1)' sample.yml
 ```
 will output
 ```yaml
@@ -43,7 +49,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[1])' sample.yml
+yq 'del(.[1])' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +65,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[0].a)' sample.yml
+yq 'del(.[0].a)' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +80,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.c)' sample.yml
+yq 'del(.c)' sample.yml
 ```
 will output
 ```yaml
@@ -91,7 +97,7 @@ c: bat
 ```
 then
 ```bash
-yq eval 'del( .[] | select(. == "*at") )' sample.yml
+yq 'del( .[] | select(. == "*at") )' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +115,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.. | select(has("name")).name)' sample.yml
+yq 'del(.. | select(has("name")).name)' sample.yml
 ```
 will output
 ```yaml

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

@@ -2,6 +2,12 @@
 
 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
@@ -11,7 +17,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | documentIndex' sample.yml
+yq '.a | document_index' sample.yml
 ```
 will output
 ```yaml
@@ -29,7 +35,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | di' sample.yml
+yq '.a | di' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +53,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(documentIndex == 1)' sample.yml
+yq 'select(document_index == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -63,7 +69,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(di == 1)' sample.yml
+yq 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +85,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
+yq '.a | ({"match": ., "doc": document_index})' sample.yml
 ```
 will output
 ```yaml

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

@@ -4,24 +4,33 @@ 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.
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Encode value as json string
 Given a sample.yml file of:
 ```yaml
@@ -30,7 +39,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_json)' sample.yml
+yq '.b = (.a | to_json)' sample.yml
 ```
 will output
 ```yaml
@@ -52,7 +61,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_json(0))' sample.yml
+yq '.b = (.a | to_json(0))' sample.yml
 ```
 will output
 ```yaml
@@ -71,7 +80,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | @json)' sample.yml
+yq '.b = (.a | @json)' sample.yml
 ```
 will output
 ```yaml
@@ -89,7 +98,7 @@ a: '{"cool":"thing"}'
 ```
 then
 ```bash
-yq eval '.a | from_json | ... style=""' sample.yml
+yq '.a | from_json | ... style=""' sample.yml
 ```
 will output
 ```yaml
@@ -104,7 +113,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | @props)' sample.yml
+yq '.b = (.a | @props)' sample.yml
 ```
 will output
 ```yaml
@@ -114,6 +123,60 @@ 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
 
@@ -125,7 +188,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_yaml)' sample.yml
+yq '.b = (.a | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +211,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_yaml(8))' sample.yml
+yq '.b = (.a | to_yaml(8))' sample.yml
 ```
 will output
 ```yaml
@@ -167,7 +230,7 @@ a: 'foo: bar'
 ```
 then
 ```bash
-yq eval '.b = (.a | from_yaml)' sample.yml
+yq '.b = (.a | from_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -186,7 +249,7 @@ a: |
 ```
 then
 ```bash
-yq eval '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -202,7 +265,7 @@ a: 'foo: bar'
 ```
 then
 ```bash
-yq eval '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -221,7 +284,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@csv' sample.yml
+yq '@csv' sample.yml
 ```
 will output
 ```yaml
@@ -242,7 +305,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@csv' sample.yml
+yq '@csv' sample.yml
 ```
 will output
 ```yaml
@@ -266,7 +329,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@tsv' sample.yml
+yq '@tsv' sample.yml
 ```
 will output
 ```yaml
@@ -284,7 +347,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a | to_xml' sample.yml
+yq '.a | to_xml' sample.yml
 ```
 will output
 ```yaml
@@ -304,7 +367,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a | @xml' sample.yml
+yq '.a | @xml' sample.yml
 ```
 will output
 ```yaml
@@ -322,7 +385,7 @@ a:
 ```
 then
 ```bash
-yq eval '{"cat": .a | to_xml(1)}' sample.yml
+yq '{"cat": .a | to_xml(1)}' sample.yml
 ```
 will output
 ```yaml
@@ -339,7 +402,7 @@ a: <foo>bar</foo>
 ```
 then
 ```bash
-yq eval '.b = (.a | from_xml)' sample.yml
+yq '.b = (.a | from_xml)' sample.yml
 ```
 will output
 ```yaml
@@ -348,3 +411,66 @@ 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

@@ -2,6 +2,12 @@
 
 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
@@ -10,7 +16,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -28,7 +34,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +51,7 @@ null
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +65,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -77,7 +83,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +99,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
+yq 'with_entries(.key |= "KEY_" + .)' sample.yml
 ```
 will output
 ```yaml
@@ -101,6 +107,26 @@ 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
@@ -111,7 +137,7 @@ c:
 ```
 then
 ```bash
-yq eval 'with_entries(select(.value | has("b")))' sample.yml
+yq 'with_entries(select(.value | has("b")))' sample.yml
 ```
 will output
 ```yaml

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

@@ -1,11 +1,45 @@
 # Env Variable Operators
 
-This operator is used to handle environment variables usage in path expressions. 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. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
+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:
+
+```bash
+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
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
+myenv="cat meow" yq --null-input '.a = env(myenv)'
 ```
 will output
 ```yaml
@@ -15,7 +49,7 @@ a: cat meow
 ## Read boolean environment variable
 Running
 ```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
+myenv="true" yq --null-input '.a = env(myenv)'
 ```
 will output
 ```yaml
@@ -25,7 +59,7 @@ a: true
 ## Read numeric environment variable
 Running
 ```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
+myenv="12" yq --null-input '.a = env(myenv)'
 ```
 will output
 ```yaml
@@ -35,7 +69,7 @@ a: 12
 ## Read yaml environment variable
 Running
 ```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
+myenv="{b: fish}" yq --null-input '.a = env(myenv)'
 ```
 will output
 ```yaml
@@ -45,7 +79,7 @@ a: {b: fish}
 ## Read boolean environment variable as a string
 Running
 ```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
+myenv="true" yq --null-input '.a = strenv(myenv)'
 ```
 will output
 ```yaml
@@ -55,13 +89,35 @@ a: "true"
 ## Read numeric environment variable as a string
 Running
 ```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
+myenv="12" yq --null-input '.a = strenv(myenv)'
 ```
 will output
 ```yaml
 a: "12"
 ```
 
+## Dynamically update a path from an environment variable
+The env variable can be any valid yq expression.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+pathEnv=".a.b[0].name"  valueEnv="moo" yq 'eval(strenv(pathEnv)) = strenv(valueEnv)' sample.yml
+```
+will output
+```yaml
+a:
+  b:
+    - name: moo
+    - name: cat
+```
+
 ## Dynamic key lookup with environment variable
 Given a sample.yml file of:
 ```yaml
@@ -70,10 +126,137 @@ dog: woof
 ```
 then
 ```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
+myenv="cat" yq '.[env(myenv)]' sample.yml
 ```
 will output
 ```yaml
 meow
 ```
 
+## Replace strings with envsubst
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenv} meows" | envsubst'
+```
+will output
+```yaml
+the cat meows
+```
+
+## Replace strings with envsubst, missing variables
+Running
+```bash
+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
+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
+v: ${myenv}
+```
+then
+```bash
+myenv="cat meow" yq '.v |= envsubst' sample.yml
+```
+will output
+```yaml
+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.
 
@@ -12,6 +12,21 @@ 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)
+
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Match string
 Given a sample.yml file of:
 ```yaml
@@ -21,7 +36,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == "*at")' sample.yml
+yq '.[] | (. == "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -39,7 +54,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != "*at")' sample.yml
+yq '.[] | (. != "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +72,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == 4)' sample.yml
+yq '.[] | (. == 4)' sample.yml
 ```
 will output
 ```yaml
@@ -66,7 +81,7 @@ true
 false
 ```
 
-## Dont match number
+## Don't match number
 Given a sample.yml file of:
 ```yaml
 - 3
@@ -75,7 +90,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != 4)' sample.yml
+yq '.[] | (. != 4)' sample.yml
 ```
 will output
 ```yaml
@@ -87,21 +102,21 @@ true
 ## Match nulls
 Running
 ```bash
-yq eval --null-input 'null == ~'
+yq --null-input 'null == ~'
 ```
 will output
 ```yaml
 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
 ```
 then
 ```bash
-yq eval 'select(.b != "thing")' sample.yml
+yq 'select(.b != "thing")' sample.yml
 ```
 will output
 ```yaml
@@ -115,7 +130,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(.b == .c)' sample.yml
+yq 'select(.b == .c)' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/error.md

@@ -0,0 +1,56 @@
+# Error
+
+Use this operation to short-circuit expressions. Useful for validation.
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## 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

@@ -0,0 +1,54 @@
+# Eval
+
+Use `eval` to dynamically process an expression - for instance from an environment variable.
+
+`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, beit a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
+
+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
+pathExp: .a.b[] | select(.name == "cat")
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+yq 'eval(.pathExp)' sample.yml
+```
+will output
+```yaml
+name: cat
+```
+
+## Dynamically update a path from an environment variable
+The env variable can be any valid yq expression.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+pathEnv=".a.b[0].name"  valueEnv="moo" yq 'eval(strenv(pathEnv)) = strenv(valueEnv)' sample.yml
+```
+will output
+```yaml
+a:
+  b:
+    - name: moo
+    - name: cat
+```
+

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

@@ -10,6 +10,12 @@ 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
@@ -17,7 +23,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'filename' sample.yml
+yq 'filename' sample.yml
 ```
 will output
 ```yaml
@@ -31,7 +37,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fileIndex' sample.yml
+yq 'file_index' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +55,7 @@ a: cat
 ```
 then
 ```bash
-yq eval-all 'fileIndex' sample.yml another.yml
+yq eval-all 'file_index' sample.yml another.yml
 ```
 will output
 ```yaml
@@ -65,7 +71,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fi' sample.yml
+yq 'fi' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/flatten.md

@@ -1,6 +1,12 @@
 # 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
 
@@ -12,7 +18,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -30,7 +36,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten(1)' sample.yml
+yq 'flatten(1)' sample.yml
 ```
 will output
 ```yaml
@@ -46,7 +52,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -61,7 +67,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml

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

@@ -2,6 +2,12 @@
 
 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
@@ -14,7 +20,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'group_by(.foo)' sample.yml
+yq 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +46,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'group_by(.foo)' sample.yml
+yq 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/has.md

@@ -2,6 +2,12 @@
 
 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
@@ -12,7 +18,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has("a")' sample.yml
+yq '.[] | has("a")' sample.yml
 ```
 will output
 ```yaml
@@ -36,7 +42,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(.a.b | has("c"))' sample.yml
+yq '.[] | select(.a.b | has("c"))' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +63,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has(1)' sample.yml
+yq '.[] | has(1)' sample.yml
 ```
 will output
 ```yaml

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

@@ -5,7 +5,7 @@
 
 yq [eval/eval-all] [expression] files..
 
-eval/e  - Apply the expression to each document in each yaml file in sequence
+eval/e  - (default) Apply the expression to each document in each yaml file in sequence
 
 eval-all/ea - Loads all yaml documents of all yaml files and runs expression once
 
@@ -18,32 +18,33 @@ This documentation is also available at https://mikefarah.gitbook.io/yq/
 
 ## Read a value:
 ```bash
-yq e '.a.b[0].c' file.yaml
+yq '.a.b[0].c' file.yaml
 ```
 
 ## Pipe from STDIN:
 ```bash
-cat file.yaml | yq e '.a.b[0].c' -
+cat file.yaml | yq '.a.b[0].c'
 ```
 
 ## Update a yaml file, inplace
 ```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
+yq -i '.a.b[0].c = "cool"' file.yaml
 ```
 
 ## Update using environment variables
 ```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
 ```
 
 ## Merge multiple files
 ```
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```
+Note the use of `ea` to evaluate all files at once (instead of in sequence.)
 
 ## Multiple updates to a yaml file
 ```bash
-yq e -i '
+yq -i '
   .a.b[0].c = "cool" |
   .x.y.z = "foobar" |
   .person.name = strenv(NAME)

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

@@ -4,5 +4,7 @@ Add behaves differently according to the type of the LHS:
 * arrays: concatenate
 * number scalars: arithmetic addition
 * string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)
+
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.

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

@@ -0,0 +1,26 @@
+# Date Time
+
+Various operators for parsing and manipulating dates. 
+
+## Date time formattings
+This uses the golangs built in time library for parsing and formatting date times.
+
+When not specified, the RFC3339 standard is assumed `2006-01-02T15:04:05Z07:00` for parsing.
+
+To specify a custom parsing format, use the `with_dtf` operator. The first parameter sets the datetime parsing format for the expression in the second parameter. The expression can be any valid `yq` expression tree.
+
+```bash
+yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
+```
+
+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 the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
+
+
+## Durations
+Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
+
+You can durations to time using the `+` operator.

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

@@ -1,3 +1,31 @@
 # Env Variable Operators
 
-This operator is used to handle environment variables usage in path expressions. 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. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
+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:
+
+```bash
+yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
+```
+

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/eval.md

@@ -0,0 +1,7 @@
+# Eval
+
+Use `eval` to dynamically process an expression - for instance from an environment variable.
+
+`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, beit a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
+
+Tip: This can be useful way parameterise complex scripts.

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.