Using new lexer by alecthomas!

* adding support for --wrapScalar=false in properties encoder

* altering encoder and decoder tests somewhat

* adding .idea

* Revert "altering encoder and decoder tests somewhat"

This reverts commit e3655130e2.

* adding test scenario for encoding with wrapped scalars

.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/dependabot.yml

@@ -0,0 +1,22 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      day: thursday
+      interval: weekly
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      day: thursday
+      interval: weekly
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      day: thursday
+      interval: weekly

.github/workflows/codeql.yml

@@ -0,0 +1,70 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '24 3 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/docker-release.yml

@@ -0,0 +1,62 @@
+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]
+on: [push, pull_request]
+permissions:
+  contents: read
+
 jobs:
 
   build:
@@ -7,14 +10,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.15
-      uses: actions/setup-go@v1
+    - name: Set up Go 1.18
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.15
+        go-version: 1.18
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Get dependencies
       run: |
@@ -24,8 +27,9 @@ jobs:
             dep ensure
         fi
 
-    - name: Download deps
+    - name: Check the build
+      shell: bash -l {0}
       run: |
         export PATH=${PATH}:`go env GOPATH`/bin
         scripts/devtools.sh
-        make local build
+        make local build

.github/workflows/release-test.yml

@@ -1,95 +0,0 @@
-name: Test Release YQ
-on:
-  push:
-    tags:
-      - 'releaseTest-*'
-
-jobs:
-  publishGitRelease:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: '^1.17.2'
-      - name: Compile man page markup
-        id: gen-man-page-md
-        run: |
-          ./scripts/generate-man-page-md.sh
-          echo "::set-output name=man-page-md::man.md"
-
-      - name: Get the version
-        id: get_version
-        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
-      - name: Generate man page
-        uses: docker://pandoc/core:2.14.2
-        id: gen-man-page
-        env:
-          MAN_HEADER: yq (https://github.com/mikefarah/yq/) version ${{ steps.get_version.outputs.VERSION }}
-        with:
-          args: >-
-            --standalone
-            --to man
-            --variable=title:"YQ"
-            --variable=section:"1"
-            --variable=header:"${MAN_HEADER}"
-            --variable=author:"Mike Farah"
-            --output=yq.1
-            ${{ steps.gen-man-page-md.outputs.man-page-md }}
-        
-      - name: Cross compile
-        run: |
-          sudo apt-get install rhash -y
-          go get github.com/mitchellh/gox
-          mkdir -p build
-          cp yq.1 build/yq.1
-          ./scripts/xcompile.sh
-
-      - name: Create Release
-        id: create_release
-        uses: actions/create-release@v1.0.0
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ github.ref }}
-          release_name: TEST ${{ github.ref }}
-          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 ${{ steps.buildx.outputs.platforms }} && docker version
- 
-  #     - name: Build image
-  #       run: |
-  #         IMAGE_V_VERSION="$(git describe --tags --abbrev=0)"
-  #         IMAGE_VERSION=${IMAGE_V_VERSION:1}
-
-  #         SHORT_SHA1=$(git rev-parse --short HEAD)
-  #         PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
-  #         echo "Building version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
-  #         docker buildx build --platform "${PLATFORMS}" .
-    

.github/workflows/release.yml

@@ -3,68 +3,51 @@ 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: '^1.17.2'
+          go-version: '^1.18'
+      - name: Compile man page markup
+        id: gen-man-page-md
+        run: |
+          ./scripts/generate-man-page-md.sh
+          echo "::set-output name=man-page-md::man.md"
+
+      - name: Get the version
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF##*/}
+
+      - name: Generate man page
+        uses: docker://pandoc/core:2.14.2
+        id: gen-man-page
+        with:
+          args: >-
+            --standalone
+            --to man
+            --variable=title:"YQ"
+            --variable=section:"1"
+            --variable=header:"yq (https://github.com/mikefarah/yq/) version ${{ steps.get_version.outputs.VERSION }}"
+            --variable=author:"Mike Farah"
+            --output=yq.1
+            ${{ steps.gen-man-page-md.outputs.man-page-md }}
+
       - 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@v1.0.0
-        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=${IMAGE_V_VERSION:1}
-
-          SHORT_SHA1=$(git rev-parse --short HEAD)
-          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 ${{ secrets.DOCKER_USERNAME }} --password-stdin
-          docker buildx build --platform "${PLATFORMS}" -t "${IMAGE_NAME}:${IMAGE_VERSION}"  -t "${IMAGE_NAME}:latest" -t "${IMAGE_NAME}:4" \
-            --push .
-    
+          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 +10,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get test
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval '.a' examples/data1.yaml
+          cmd: yq eval '.a' examples/sample.yaml
       - name: Write inplace test
         id: lookupSdkVersion
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval -i '.a.b = 5' examples/data1.yaml
+          cmd: yq eval -i '.b.c = 5' examples/sample.yaml

.gitignore

@@ -38,10 +38,22 @@ parts/
 prime/
 .snapcraft/
 yq*.snap
+
 test.yml
-test2.yml
+test*.yml
+test*.yaml
+0.yml
+1.yml
+2.yml
 
 
 # man page
 man.md
-yq.1
+yq.1
+
+# debian pkg
+_build
+debian/files
+
+# intellij
+/.idea

.golangci.yml

@@ -0,0 +1,40 @@
+run:
+  timeout: 5m
+linters:
+  enable:
+    - asciicheck
+    - depguard
+    - errorlint
+    - gci
+    - gochecknoinits
+    - gofmt
+    - goimports
+    - gosec
+    - megacheck
+    - misspell
+    - nakedret
+    - nolintlint
+    - predeclared
+    - 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:
+    - gosec
+    text:  "Implicit memory aliasing in for loop."
+    path: _test\.go
+  - linters:
+    - revive
+    text: "unexported-return"
+  - linters:
+    - revive
+    text: "var-naming"

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

@@ -1,30 +1,28 @@
-FROM golang:1.17 as builder
+FROM golang:1.18.3 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
-COPY . /go/src/mikefarah/yq
+COPY . .
 
 RUN CGO_ENABLED=0 go build .
-RUN ./scripts/test.sh
+# RUN ./scripts/test.sh -- this too often times out in the github pipeline.
 RUN ./scripts/acceptance.sh
 
 # Choose alpine as a base image to make this useful for CI, as many
 # CI tools expect an interactive shell inside the container
 FROM alpine:3 as production
-
-RUN mkdir /home/yq/
-RUN addgroup -g 1000 yq && \
-    adduser -u 1000 -G yq -s /bin/bash -h /home/yq -D yq
-RUN chown -R yq:yq /home/yq/
+LABEL maintainer="Mike Farah <mikefarah@users.noreply.github.com>"
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
-RUN chmod +x /usr/bin/yq
-
-ARG VERSION=none
-LABEL version=${VERSION}
-
-USER yq
 
 WORKDIR /workdir
 
+RUN set -eux; \
+  addgroup -g 1000 yq; \
+  adduser -u 1000 -G yq -s /bin/sh -h /home/yq -D yq
+
+RUN chown -R yq:yq /workdir
+
+USER yq
+
 ENTRYPOINT ["/usr/bin/yq"]

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.17
+FROM golang:1.18.3
 
 COPY scripts/devtools.sh /opt/devtools.sh
 

LICENSE

@@ -1,3 +1,5 @@
+The MIT License (MIT)
+
 Copyright (c) 2017 Mike Farah
 
 Permission is hereby granted, free of charge, to any person obtaining a copy

Makefile

@@ -2,6 +2,7 @@ MAKEFLAGS += --warn-undefined-variables
 SHELL := /bin/bash
 .SHELLFLAGS := -o pipefail -euc
 .DEFAULT_GOAL := install
+ENGINE := $(shell { command -v podman || command -v docker; } 2>/dev/null)
 
 include Makefile.variables
 
@@ -33,7 +34,7 @@ clean:
 
 ## prefix before other make targets to run in your local dev environment
 local: | quiet
-	@$(eval DOCKRUN= )
+	@$(eval ENGINERUN= )
 	@mkdir -p tmp
 	@touch tmp/dev_image_id
 quiet: # this is silly but shuts up 'Nothing to be done for `local`'
@@ -42,9 +43,9 @@ quiet: # this is silly but shuts up 'Nothing to be done for `local`'
 prepare: tmp/dev_image_id
 tmp/dev_image_id: Dockerfile.dev scripts/devtools.sh
 	@mkdir -p tmp
-	@docker rmi -f ${DEV_IMAGE} > /dev/null 2>&1 || true
-	@docker build -t ${DEV_IMAGE} -f Dockerfile.dev .
-	@docker inspect -f "{{ .ID }}" ${DEV_IMAGE} > tmp/dev_image_id
+	@${ENGINE} rmi -f ${DEV_IMAGE} > /dev/null 2>&1 || true
+	@${ENGINE} build -t ${DEV_IMAGE} -f Dockerfile.dev .
+	@${ENGINE} inspect -f "{{ .ID }}" ${DEV_IMAGE} > tmp/dev_image_id
 
 # ----------------------------------------------
 # build
@@ -54,57 +55,61 @@ build: build/dev
 .PHONY: build/dev
 build/dev: test *.go
 	@mkdir -p bin/
-	${DOCKRUN} go build --ldflags "$(LDFLAGS)"
-	${DOCKRUN} bash ./scripts/acceptance.sh
+	${ENGINERUN} go build --ldflags "$(LDFLAGS)"
+	${ENGINERUN} bash ./scripts/acceptance.sh
 
 ## Compile the project for multiple OS and Architectures.
 xcompile: check
 	@rm -rf build/
 	@mkdir -p build
-	${DOCKRUN} bash ./scripts/xcompile.sh
+	${ENGINERUN} bash ./scripts/xcompile.sh
 	@find build -type d -exec chmod 755 {} \; || :
 	@find build -type f -exec chmod 755 {} \; || :
 
 .PHONY: install
 install: build
-	${DOCKRUN} go install
+	${ENGINERUN} go install
 
 # Each of the fetch should be an entry within vendor.json; not currently included within project
 .PHONY: vendor
 vendor: tmp/dev_image_id
-	${DOCKRUN} go mod vendor
+	@mkdir -p vendor
+	${ENGINERUN} go mod vendor
 
 # ----------------------------------------------
 # develop and test
 
 .PHONY: format
 format: vendor
-	${DOCKRUN} bash ./scripts/format.sh
+	${ENGINERUN} bash ./scripts/format.sh
 
-.PHONY: check
-check: format
-	${DOCKRUN} bash ./scripts/check.sh
 
 .PHONY: secure
-secure: 
-	${DOCKRUN} bash ./scripts/secure.sh
+secure: format
+	${ENGINERUN} bash ./scripts/secure.sh
+
+.PHONY: check
+check: secure
+	${ENGINERUN} bash ./scripts/check.sh
+
+
 
 .PHONY: test
 test: check
-	${DOCKRUN} bash ./scripts/test.sh
+	${ENGINERUN} bash ./scripts/test.sh
 
 .PHONY: cover
 cover: check
 	@rm -rf cover/
 	@mkdir -p cover
-	${DOCKRUN} bash ./scripts/coverage.sh
+	${ENGINERUN} bash ./scripts/coverage.sh
 	@find cover -type d -exec chmod 755 {} \; || :
 	@find cover -type f -exec chmod 644 {} \; || :
 
 
 .PHONY: release
 release: xcompile
-	${DOCKRUN} bash ./scripts/publish.sh
+	${ENGINERUN} bash ./scripts/publish.sh
 
 # ----------------------------------------------
 # utilities

Makefile.variables

@@ -29,7 +29,7 @@ endif
 
 DEV_IMAGE := ${PROJECT}_dev
 
-DOCKRUN := docker run --rm \
+ENGINERUN := ${ENGINE} run --rm \
 	-e LDFLAGS="${LDFLAGS}" \
 	-e GITHUB_TOKEN="${GITHUB_TOKEN}" \
 	-v ${ROOT}/vendor:/go/src \

README.md

@@ -1,49 +1,77 @@
 # 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 and xml. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
 
-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, all listed below.
+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.
 
 ## Install
 
@@ -73,49 +101,41 @@ Using [Homebrew](https://brew.sh/)
 brew install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-brew install yq@3
-```
-
-Note that for v3, as it is a versioned brew it will not add the `yq` command to your path automatically. Please follow the instructions given by brew upon installation.
-
 ### Linux via snap:
 ```
 snap install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-snap install yq --channel=v3/stable
-```
-
 #### Snap notes
 `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
-
+### 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...
 ```
 
 #### Pipe in via STDIN:
@@ -123,7 +143,11 @@ docker 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
+podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 #### Run commands interactively:
@@ -132,6 +156,10 @@ cat myfile.yml | docker run -i --rm mikefarah/yq e . -
 docker run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
 ```
 
+```bash
+podman run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
+```
+
 It can be useful to have a bash function to avoid typing the whole docker command:
 
 ```bash
@@ -140,23 +168,42 @@ yq() {
 }
 ```
 
-
+```bash
+yq() {
+  podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
+}
+```
 #### Running as root:
 
-`yq`'s docker image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the docker image, or you're having permissions issues when attempting to read/write files you'll need to either:
+`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:
 
 
 ```
 docker run --user="root" -it --entrypoint sh mikefarah/yq
 ```
 
-Or, in your docker file:
+```
+podman run --user="root" -it --entrypoint sh mikefarah/yq
+```
+
+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
 ```
 
@@ -165,14 +212,14 @@ USER yq
   - 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'
 ```
 
 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
@@ -187,6 +234,12 @@ 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)
@@ -224,19 +277,23 @@ 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 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 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)
@@ -250,33 +307,46 @@ 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.
 ```
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
-- Powershell has its own...opinions: https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell
+- Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
 
-See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.
+See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.

acceptance_tests/bad_args.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+testWriteInPlacePipeIn() {
+  result=$(./yq e -i -n '.a' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: write inplace flag only applicable when giving an expression and at least one file" "$result"
+}
+
+testWriteInPlacePipeInEvalall() {
+  result=$(./yq ea -i -n '.a' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: write inplace flag only applicable when giving an expression and at least one file" "$result"
+}
+
+testWriteInPlaceWithSplit() {
+  result=$(./yq e -s "cat" -i '.a = "thing"' test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: write inplace cannot be used with split file" "$result"
+}
+
+testWriteInPlaceWithSplitEvalAll() {
+  result=$(./yq ea -s "cat" -i '.a = "thing"' test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: write inplace cannot be used with split file" "$result"
+}
+
+testNullWithFiles() {
+  result=$(./yq e -n '.a = "thing"' test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: cannot pass files in when using null-input flag" "$result"
+}
+
+testNullWithFilesEvalAll() {
+  result=$(./yq ea -n '.a = "thing"' test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: cannot pass files in when using null-input flag" "$result"
+}
+
+
+
+source ./scripts/shunit2

acceptance_tests/basic.sh

@@ -1,12 +1,225 @@
 #!/bin/bash
 
 setUp() {
-  rm -f test.yml
+  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/empty.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 setUp() {
+  rm test*.yml || true
   cat >test.yml <<EOL
 # comment
 EOL

acceptance_tests/front-matter.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 setUp() {
+  rm test*.yml || true
   cat >test.yml <<EOL
 ---
 a: apple

acceptance_tests/inputs-format.sh

@@ -0,0 +1,121 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml 2>/dev/null || true
+  rm test*.properties 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"
+}
+
+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

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 setUp() {
+  rm test*.yml || true
   cat >test.yml <<EOL
 ---
 a: test

acceptance_tests/load-file.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+testLoadFileNotExist() {
+  result=$(./yq e -n 'load("cat.yml")' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: Failed to load cat.yml: open cat.yml: no such file or directory" "$result"
+}
+
+testLoadFileExpNotExist() {
+  result=$(./yq e -n 'load(.a)' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: Filename expression returned nil" "$result"
+}
+
+testStrLoadFileNotExist() {
+  result=$(./yq e -n 'strload("cat.yml")' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: Failed to load cat.yml: open cat.yml: no such file or directory" "$result"
+}
+
+testStrLoadFileExpNotExist() {
+  result=$(./yq e -n 'strload(.a)' 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: Filename expression returned nil" "$result"
+}
+
+source ./scripts/shunit2

acceptance_tests/output-format.sh

@@ -1,5 +1,9 @@
 #!/bin/bash
 
+setUp() {
+  rm test*.yml || true
+}
+
 testOutputJsonDeprecated() {
   cat >test.yml <<EOL
 a: {b: ["cat"]}
@@ -98,4 +102,65 @@ EOM
   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/pretty-print.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+setUp() {
+  rm test*.yml || true
+}
 
 testPrettyPrintWithBooleans() {
   cat >test.yml <<EOL

acceptance_tests/split-printer.sh

@@ -0,0 +1,207 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+}
+
+testBasicSplitWithName() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq e test.yml -s ".a"
+
+  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" "$doc2"
+}
+
+testBasicSplitWithNameCustomExtension() {
+  rm test*.yaml || true
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq e test.yml -s '.a + ".yaml"'
+
+  doc1=$(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" "$doc2"
+}
+
+testBasicSplitWithNameEvalAll() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq ea test.yml -s ".a"
+
+  doc1=$(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"
+}
+
+testBasicSplitWithIndex() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq e test.yml -s '"test_" + $index'
+
+  doc1=$(cat test_0.yml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_1.yml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
+testBasicSplitWithIndexEvalAll() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq ea test.yml -s '"test_" + $index'
+
+  doc1=$(cat test_0.yml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_1.yml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
+
+testArraySplitWithNameNoSeparators() {
+  cat >test.yml <<EOL
+- name: test_fred
+  age: 35
+- name: test_catherine
+  age: 37
+EOL
+
+  ./yq e --no-doc -s ".name"  ".[]" test.yml 
+
+  doc1=$(cat test_fred.yml)
+  read -r -d '' expectedDoc1 << EOM
+name: test_fred
+age: 35
+EOM
+
+  assertEquals "$expectedDoc1" "$doc1"
+
+  doc2=$(cat test_catherine.yml)
+  read -r -d '' expectedDoc2 << EOM
+name: test_catherine
+age: 37
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
+testArraySplitWithNameNoSeparatorsEvalAll() {
+  cat >test.yml <<EOL
+- name: test_fred
+  age: 35
+- name: test_catherine
+  age: 37
+EOL
+
+cat >test2.yml <<EOL
+- name: test_mike
+  age: 564
+EOL
+
+  ./yq ea --no-doc -s ".name"  ".[]" test.yml test2.yml
+
+  doc1=$(cat test_fred.yml)
+  read -r -d '' expectedDoc1 << EOM
+name: test_fred
+age: 35
+EOM
+
+  assertEquals "$expectedDoc1" "$doc1"
+
+  doc2=$(cat test_catherine.yml)
+  read -r -d '' expectedDoc2 << EOM
+name: test_catherine
+age: 37
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+
+
+  doc3=$(cat test_mike.yml)
+  read -r -d '' expectedDoc3 << EOM
+name: test_mike
+age: 564
+EOM
+  assertEquals "$expectedDoc3" "$doc3"
+}
+
+source ./scripts/shunit2

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

@@ -6,6 +6,13 @@ var unwrapScalar = true
 var writeInplace = false
 var outputToJSON = false
 var outputFormat = "yaml"
+var inputFormat = "yaml"
+
+var xmlAttributePrefix = "+"
+var xmlContentName = "+content"
+var xmlStrictMode = false
+var xmlKeepNamespace = true
+var xmlUseRawToken = true
 
 var exitStatus = false
 var forceColor = false
@@ -21,4 +28,11 @@ var prettyPrint = false
 // can be either "" (off), "extract" or "process"
 var frontMatter = ""
 
+var splitFileExp = ""
+var splitFileExpFile = ""
+
 var completedSuccessfully = false
+
+var forceExpression = ""
+
+var expressionFile = ""

cmd/evaluate_all_command.go

@@ -2,8 +2,6 @@ package cmd
 
 import (
 	"errors"
-	"fmt"
-	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -40,55 +38,36 @@ Note that it consumes more memory than eval.
 	}
 	return cmdEvalAll
 }
-func evaluateAll(cmd *cobra.Command, args []string) error {
-	cmd.SilenceUsage = true
+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
 	// 2+ args, [0] = expression, file the rest
 
 	var err error
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+
+	expression, args, err := initCommand(cmd, args)
+	if err != nil {
+		return err
+	}
 
 	out := cmd.OutOrStdout()
 
-	fileInfo, _ := os.Stdout.Stat()
-
-	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
-		colorsEnabled = true
-	}
-
-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
-		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
-	}
-
 	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) }()
-	}
-
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-	// backwards compatibilty
-	if outputToJSON {
-		outputFormat = "json"
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -96,15 +75,26 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	printer := yqlib.NewPrinter(out, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
+
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
+
+	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()
@@ -115,22 +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)
+		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)
-		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		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 
@@ -44,61 +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 {
-	cmd.SilenceUsage = true
+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
 
-	var err error
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-
 	out := cmd.OutOrStdout()
 
-	fileInfo, _ := os.Stdout.Stat()
+	var err error
 
-	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
-		colorsEnabled = true
-	}
-
-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
-		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	expression, args, err := initCommand(cmd, args)
+	if err != nil {
+		return err
 	}
 
 	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) }()
-	}
-
-	// backwards compatibilty
-	if outputToJSON {
-		outputFormat = "json"
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -106,21 +89,28 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	printer := yqlib.NewPrinter(out, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
 
+	printer := yqlib.NewPrinter(encoder, printerWriter)
+
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	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()
@@ -132,20 +122,14 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 
 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+		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)
-		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"os"
 
+	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
 	logging "gopkg.in/op/go-logging.v1"
 )
@@ -13,17 +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}`,
 			)
@@ -37,6 +51,10 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 			}
 
 			logging.SetBackend(backend)
+			yqlib.InitExpressionParser()
+			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
+			yqlib.XMLPreferences.ContentName = xmlContentName
+			yqlib.XMLPreferences.StrictMode = xmlStrictMode
 		},
 	}
 
@@ -48,21 +66,36 @@ 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().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.")
+	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 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(),
 		createEvaluateAllCommand(),

cmd/utils.go

@@ -0,0 +1,171 @@
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/mikefarah/yq/v4/pkg/yqlib"
+	"github.com/spf13/cobra"
+	"gopkg.in/op/go-logging.v1"
+)
+
+func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
+	cmd.SilenceUsage = true
+
+	fileInfo, _ := os.Stdout.Stat()
+
+	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
+		colorsEnabled = true
+	}
+
+	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
+	if outputToJSON {
+		outputFormat = "json"
+	}
+
+	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 "", nil, fmt.Errorf("write inplace cannot be used with split file")
+	}
+
+	if nullInput && len(args) > 0 {
+		return "", nil, fmt.Errorf("cannot pass files in when using null-input flag")
+	}
+
+	return expression, args, nil
+}
+
+func configureDecoder() (yqlib.Decoder, error) {
+	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
+	if err != nil {
+		return nil, err
+	}
+	switch yqlibInputFormat {
+	case yqlib.XMLInputFormat:
+		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName, xmlStrictMode, xmlKeepNamespace, xmlUseRawToken), nil
+	case yqlib.PropertiesInputFormat:
+		return yqlib.NewPropertiesDecoder(), nil
+	}
+
+	return yqlib.NewYamlDecoder(), nil
+}
+
+func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yqlib.PrinterWriter, error) {
+
+	var printerWriter yqlib.PrinterWriter
+
+	if splitFileExp != "" {
+		colorsEnabled = forceColor
+		splitExp, err := yqlib.ExpressionParser.ParseExpression(splitFileExp)
+		if err != nil {
+			return nil, fmt.Errorf("bad split document expression: %w", err)
+		}
+		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
+	} else {
+		printerWriter = yqlib.NewSinglePrinterWriter(out)
+	}
+	return printerWriter, nil
+}
+
+func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
+	switch format {
+	case yqlib.JSONOutputFormat:
+		return yqlib.NewJONEncoder(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 = "4.13.4"
+	Version = "4.25.3"
 
 	// 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

@@ -1,5 +1,12 @@
-Resources:
-  S3Bucket:
-    Type: AWS::CloudFormation::Stack
-    Properties:
-      BucketName: !Ref MyBucketNameA
+# --------------------------------------------------
+# It's a test with comment
+# --------------------------------------------------
+test:
+  - name: a
+  - name: b
+  - name: c
+groups:
+  - name: a
+  - name: b
+  - name: c
+  - name: c

examples/data2.yaml

@@ -1,3 +1,5 @@
-#b1 
-b: 2
-#b2
+# --------------------------------------------------
+# 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

@@ -0,0 +1,14 @@
+<!-- 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/mike2.xml

@@ -0,0 +1,11 @@
+  <?xml version="1.0" encoding="UTF-8"?>
+  <!-- osm-->
+  <osm version="0.6" generator="CGImap 0.0.2">
+  <!-- bounds-->
+   <bounds minlat="54.0889580" minlon="12.2487570" maxlat="54.0913900" maxlon="12.2524800">
+   <!-- great -->
+   cool
+   </bounds>
+   <foo>ba2234r</foo>
+   <foo>bar2234233</foo>
+  </osm>

examples/small.properties

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

examples/small.xml

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

examples/thing.yml

@@ -0,0 +1,2 @@
+a: apple is included
+b: cool.

github-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM mikefarah/yq:4.13.4
+FROM mikefarah/yq:4
 
 COPY entrypoint.sh /entrypoint.sh
 

go.mod

@@ -1,25 +1,29 @@
 module github.com/mikefarah/yq/v4
 
 require (
+	github.com/a8m/envsubst v1.3.0
+	github.com/alecthomas/participle/v2 v2.0.0-beta.4
+	github.com/alecthomas/repr v0.1.0
 	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.10.0
-	github.com/goccy/go-yaml v1.8.9
-	github.com/jinzhu/copier v0.2.8
-	github.com/magiconair/properties v1.8.5
-	github.com/spf13/cobra v1.1.3
-	github.com/timtadh/lexmachine v0.2.2
+	github.com/fatih/color v1.13.0
+	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 v1.5.0
+	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/mattn/go-colorable v0.1.8 // indirect
-	github.com/mattn/go-isatty v0.0.12 // 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 v0.0.0-20210809222454-d867a43fc93e // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 )
 
-go 1.17
+go 1.18

go.sum

@@ -1,330 +1,79 @@
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-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/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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-google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
-google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
-google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f h1:uF6paiQQebLeSXkrTqHqz0MXhXXS1KgF41eUdBNvxK0=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+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

@@ -1,41 +1,10 @@
+# How it works
+
 In `yq` expressions are made up of operators and pipes. A context of nodes is passed through the expression and each operation takes the context as input and returns a new context as output. That output is piped in as input for the next operation in the expression. To begin with, the context is set to the first yaml document of the first yaml file (if processing in sequence using eval).
 
 Lets look at a couple of examples.
 
-## Example with a simple operator
-
-Given a document like:
-
-```yaml
-- [a]
-- "cat"
-```
-
-with an expression:
-
-```
-.[] | length
-```
-
-`yq` will initially set the context as single node of the entire yaml document, an array of two elements.
-
-```yaml
-- [a]
-- "cat"
-```
-
-This gets piped into the splat operator `.[]` which will split out the context into a collection of two nodes `[a]` and `"cat"`. Note that this is _not_ a yaml array.
-
-The `length` operator take no arguments, and will simply return the length of _each_ matching node in the context. So for the context of `[a]` and `"cat"`, it will return a new context of `1` and `3`.
-
-This being the last operation in the expression, the results will be printed out:
-
-```
-1
-3
-```
-
-# Example with an operator that takes arguments.
+## Simple assignment example
 
 Given a document like:
 
@@ -50,6 +19,8 @@ with an expression:
 .a = .b
 ```
 
+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`. 
 
 It pipes the current, lets call it 'root' context through the `lhs` expression of `.a` to return the node 
@@ -58,7 +29,7 @@ It pipes the current, lets call it 'root' context through the `lhs` expression o
 cat
 ```
 
-Note that this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
+Sidenote: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
 
 The `=` operator then pipes the 'root' context through the `rhs` expression of `.b` to return the node
 
@@ -66,14 +37,58 @@ 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 to the value on the LHS, 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 the LHS (`.a`), and it returns the now updated context:
 
 ```yaml
 a: dog
 b: dog
 ```
 
-# Relative update (e.g. `|=`)
+
+## Complex assignment, operator precedence rules
+
+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")`.
+
+However, this is not always the case, particularly if you have a complex LHS or RHS expression, for instance if you want to select particular nodes to update. 
+
+Lets say you had:
+
+```yaml
+- name: bob
+  fruit: apple
+- name: sally
+  fruit: orange
+
+```
+
+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"`.
+
+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
+fruit: mango
+```
+
+To properly update this yaml, you will need to use brackets (think BODMAS from maths) and wrap the entire LHS:
+`(.[] | select(.name == "sally") | .fruit) = "mango"`
+
+
+Now that entire LHS expression is passed to the 'assign' (`=`) operator, and the yaml is correctly updated and returned:
+
+
+```yaml
+- name: bob
+  fruit: apple
+- name: sally
+  fruit: mango
+
+```
+
+## Relative update (e.g. `|=`)
 There is another form of the `=` operator which we call the relative form. It's very similar to `=` but with one key difference when evaluating the RHS expression.
 
 In the plain form, we pass in the 'root' level context to the RHS expression. In relative form, we pass in _each result of the LHS_ to the RHS expression. Let's go through an example.
@@ -93,7 +108,7 @@ with an expression:
 
 Similar to the `=` operator, `|=` takes two operands, the LHS and RHS.
 
-It pipes the current context (the whole document) through the LHS expression  of `.a` to get the node value:
+It pipes the current context (the whole document) through the LHS expression of `.a` to get the node value:
 
 ```
 1
@@ -111,4 +126,4 @@ The assignment operator then copies across the value from the RHS to the value o
 ```yaml
 a: 2
 b: thing
-```
+```

pkg/yqlib/all_at_once_evaluator.go

@@ -8,7 +8,7 @@ import (
 
 // A yaml expression evaluator that runs the expression once against all files/nodes in memory.
 type Evaluator interface {
-	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) error
+	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error
 
 	// EvaluateNodes takes an expression and one or more yaml nodes, returning a list of matching candidate nodes
 	EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error)
@@ -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
 	}
@@ -46,11 +46,11 @@ func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCand
 	return context.MatchingNodes, nil
 }
 
-func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) error {
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error {
 	fileIndex := 0
 	firstFileLeadingContent := ""
 
-	var allDocuments *list.List = list.New()
+	var allDocuments = list.New()
 	for _, filename := range filenames {
 		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
 		if err != nil {
@@ -61,7 +61,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 			firstFileLeadingContent = leadingContent
 		}
 
-		fileDocuments, err := readDocuments(reader, filename, fileIndex)
+		fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
 		if err != nil {
 			return err
 		}
@@ -71,14 +71,15 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 
 	if allDocuments.Len() == 0 {
 		candidateNode := &CandidateNode{
-			Document:  0,
-			Filename:  "",
-			Node:      &yaml.Node{Kind: yaml.DocumentNode, HeadComment: firstFileLeadingContent, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
-			FileIndex: 0,
+			Document:       0,
+			Filename:       "",
+			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
+			FileIndex:      0,
+			LeadingContent: firstFileLeadingContent,
 		}
 		allDocuments.PushBack(candidateNode)
 	} else {
-		allDocuments.Front().Value.(*CandidateNode).Node.HeadComment = firstFileLeadingContent
+		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
 	}
 
 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)

pkg/yqlib/all_at_once_evaluator_test.go

@@ -35,6 +35,6 @@ func TestAllAtOnceEvaluateNodes(t *testing.T) {
 	for _, tt := range evaluateNodesScenario {
 		node := test.ParseData(tt.document)
 		list, _ := evaluator.EvaluateNodes(tt.expression, &node)
-		test.AssertResultComplex(t, tt.expected, resultsToString(list))
+		test.AssertResultComplex(t, tt.expected, resultsToString(t, list))
 	}
 }

pkg/yqlib/candidate_node.go

@@ -1,21 +1,28 @@
 package yqlib
 
 import (
+	"container/list"
 	"fmt"
+	"strings"
 
 	"github.com/jinzhu/copier"
 	yaml "gopkg.in/yaml.v3"
 )
 
 type CandidateNode struct {
-	Node      *yaml.Node     // the actual node
-	Parent    *CandidateNode // parent node
-	Path      []interface{}  /// the path we took to get to this node
-	Document  uint           // the document index of this node
+	Node   *yaml.Node     // the actual node
+	Parent *CandidateNode // parent node
+	Key    *yaml.Node     // node key, if this is a value from a map (or index in an array)
+
+	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
 }
@@ -28,17 +35,75 @@ func (n *CandidateNode) GetKey() string {
 	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
 }
 
-func (n *CandidateNode) CreateChild(path interface{}, node *yaml.Node) *CandidateNode {
+func (n *CandidateNode) GetNiceTag() string {
+	return unwrapDoc(n.Node).Tag
+}
+
+func (n *CandidateNode) GetNicePath() string {
+	if n.Path != nil && len(n.Path) >= 0 {
+		pathStr := make([]string, len(n.Path))
+		for i, v := range n.Path {
+			pathStr[i] = fmt.Sprintf("%v", v)
+		}
+		return strings.Join(pathStr, ".")
+	}
+	return ""
+}
+
+func (n *CandidateNode) AsList() *list.List {
+	elMap := list.New()
+	elMap.PushBack(n)
+	return elMap
+}
+
+func (n *CandidateNode) CreateChildInMap(key *yaml.Node, node *yaml.Node) *CandidateNode {
+	var value interface{}
+	if key != nil {
+		value = key.Value
+	}
 	return &CandidateNode{
 		Node:      node,
-		Path:      n.createChildPath(path),
+		Path:      n.createChildPath(value),
 		Parent:    n,
+		Key:       key,
 		Document:  n.Document,
 		Filename:  n.Filename,
 		FileIndex: n.FileIndex,
 	}
 }
 
+func (n *CandidateNode) CreateChildInArray(index int, node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(index),
+		Parent:    n,
+		Key:       &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", index), Tag: "!!int"},
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(nil),
+		Parent:    n.Parent,
+		Key:       n.Key,
+		IsMapKey:  n.IsMapKey,
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) 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))
@@ -59,18 +124,29 @@ 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) {
+func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
 
-	n.UpdateAttributesFrom(other)
-	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) {
+func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
 	log.Debug("UpdateAttributesFrom: n: %v other: %v", n.GetKey(), other.GetKey())
 	if n.Node.Kind != other.Node.Kind {
 		// clear out the contents when switching to a different type
@@ -79,12 +155,21 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 		n.Node.Value = ""
 	}
 	n.Node.Kind = other.Node.Kind
-	n.Node.Tag = other.Node.Tag
+
+	// don't clobber custom tags...
+	if strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+		n.Node.Tag = other.Node.Tag
+	}
+
 	n.Node.Alias = other.Node.Alias
-	n.Node.Anchor = other.Node.Anchor
+
+	if !prefs.DontOverWriteAnchor {
+		n.Node.Anchor = other.Node.Anchor
+	}
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes
+
 	if n.Node.Style == 0 {
 		n.Node.Style = other.Node.Style
 	}
@@ -92,6 +177,9 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 	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/decoder.go

@@ -0,0 +1,35 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type InputFormat uint
+
+const (
+	YamlInputFormat = 1 << iota
+	XMLInputFormat
+	PropertiesInputFormat
+	Base64InputFormat
+)
+
+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
+	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_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

@@ -0,0 +1,348 @@
+package yqlib
+
+import (
+	"encoding/xml"
+	"errors"
+	"io"
+	"strings"
+	"unicode"
+
+	"golang.org/x/net/html/charset"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type xmlDecoder struct {
+	reader          io.Reader
+	readAnything    bool
+	attributePrefix string
+	contentName     string
+	strictMode      bool
+	keepNamespace   bool
+	useRawToken     bool
+	finished        bool
+}
+
+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,
+	}
+}
+
+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}
+	for _, child := range nodes {
+		yamlChild, err := dec.convertToYamlNode(child)
+		if err != nil {
+			return nil, err
+		}
+		yamlNode.Content = append(yamlNode.Content, yamlChild)
+	}
+
+	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) {
+	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode}
+
+	if len(n.Data) > 0 {
+		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 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)
+			if err != nil {
+				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
+			}
+		}
+		yamlNode.Content = append(yamlNode.Content, labelNode, valueNode)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
+	if len(n.Children) > 0 {
+		return dec.createMap(n)
+	}
+	scalar := createScalarNode(n.Data, n.Data)
+	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
+}
+
+func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	root := &xmlNode{}
+	// cant use xj - it doesn't keep map order.
+	err := dec.decodeXML(root)
+
+	if err != nil {
+		return err
+	}
+	firstNode, err := dec.convertToYamlNode(root)
+
+	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
+	return nil
+}
+
+type xmlNode struct {
+	Children    []*xmlChildrenKv
+	HeadComment string
+	FootComment string
+	LineComment string
+	Data        string
+}
+
+type xmlChildrenKv struct {
+	K           string
+	V           []*xmlNode
+	FootComment string
+}
+
+// AddChild appends a node to the list of children
+func (n *xmlNode) AddChild(s string, c *xmlNode) {
+
+	if n.Children == nil {
+		n.Children = make([]*xmlChildrenKv, 0)
+	}
+	log.Debug("looking for %s", s)
+	// see if we can find an existing entry to add to
+	for _, childEntry := range n.Children {
+		if childEntry.K == s {
+			log.Debug("found it, appending an entry%s", s)
+			childEntry.V = append(childEntry.V, c)
+			log.Debug("yay len of children in %v is %v", s, len(childEntry.V))
+			return
+		}
+	}
+	log.Debug("not there, making a new one %s", s)
+	n.Children = append(n.Children, &xmlChildrenKv{K: s, V: []*xmlNode{c}})
+}
+
+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 {
+	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
+
+	// Create first element from the root node
+	elem := &element{
+		parent: nil,
+		n:      root,
+	}
+
+	getToken := func() (xml.Token, error) {
+		if dec.useRawToken {
+			return xmlDec.RawToken()
+		}
+		return xmlDec.Token()
+	}
+
+	for {
+		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,
+				n:      &xmlNode{},
+				label:  se.Name.Local,
+			}
+
+			// 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)
+			}
+
+			// Then change the current element to its parent
+			elem = elem.parent
+		case xml.Comment:
+
+			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.
+//
+// Graphic characters include letters, marks, numbers, punctuation, symbols,
+// and spaces, from categories L, M, N, P, S, Zs.
+// Spacing characters are set by category Z and property Pattern_White_Space.
+func trimNonGraphic(s string) string {
+	if s == "" {
+		return s
+	}
+
+	var first *int
+	var last int
+	for i, r := range []rune(s) {
+		if !unicode.IsGraphic(r) || unicode.IsSpace(r) {
+			continue
+		}
+
+		if first == nil {
+			f := i // copy i
+			first = &f
+			last = i
+		} else {
+			last = i
+		}
+	}
+
+	// If first is nil, it means there are no graphic characters
+	if first == nil {
+		return ""
+	}
+
+	return string([]rune(s)[*first : last+1])
+}

pkg/yqlib/decoder_yaml.go

@@ -0,0 +1,23 @@
+package yqlib
+
+import (
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type yamlDecoder struct {
+	decoder yaml.Decoder
+}
+
+func NewYamlDecoder() Decoder {
+	return &yamlDecoder{}
+}
+
+func (dec *yamlDecoder) Init(reader io.Reader) {
+	dec.decoder = *yaml.NewDecoder(reader)
+}
+
+func (dec *yamlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	return dec.decoder.Decode(rootYamlNode)
+}

pkg/yqlib/doc/Add.md

@@ -1,265 +0,0 @@
-Add behaves differently according to the type of the LHS:
-- arrays: concatenate
-- number scalars: arithmetic addition
-- string scalars: concatenate
-
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
-
-## Concatenate and assign arrays
-Given a sample.yml file of:
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-```
-then
-```bash
-yq eval '.a.b += ["cow"]' sample.yml
-```
-will output
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-    - cow
-```
-
-## Concatenate arrays
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a + .b' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- 3
-- 4
-```
-
-## Concatenate null to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + null' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-```
-
-## Add new object to array
-Given a sample.yml file of:
-```yaml
-a:
-  - dog: woof
-```
-then
-```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
-```
-will output
-```yaml
-- dog: woof
-- 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
-a:
-  a1:
-    b:
-      - cat
-  a2:
-    b:
-      - dog
-  a3: {}
-```
-then
-```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
-```
-will output
-```yaml
-a:
-  a1:
-    b:
-      - cat
-      - mouse
-  a2:
-    b:
-      - dog
-      - mouse
-  a3: {b: [mouse]}
-```
-
-## String concatenation
-Given a sample.yml file of:
-```yaml
-a: cat
-b: meow
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: catmeow
-b: meow
-```
-
-## Number addition - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.9
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7.9
-b: 4.9
-```
-
-## Number addition - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7
-b: 4
-```
-
-## Increment numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] += 1' sample.yml
-```
-will output
-```yaml
-a: 4
-b: 6
-```
-
-## Add to null
-Adding to null simply returns the rhs
-
-Running
-```bash
-yq eval --null-input 'null + "cat"'
-```
-will output
-```yaml
-cat
-```
-

pkg/yqlib/doc/Env Variable Operators.md

@@ -1,78 +0,0 @@
-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.
-
-
-## Read string environment variable
-Running
-```bash
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: cat meow
-```
-
-## Read boolean environment variable
-Running
-```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: true
-```
-
-## Read numeric environment variable
-Running
-```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: 12
-```
-
-## Read yaml environment variable
-Running
-```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: {b: fish}
-```
-
-## Read boolean environment variable as a string
-Running
-```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "true"
-```
-
-## Read numeric environment variable as a string
-Running
-```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "12"
-```
-
-## Dynamic key lookup with environment variable
-Given a sample.yml file of:
-```yaml
-cat: meow
-dog: woof
-```
-then
-```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
-```
-will output
-```yaml
-meow
-```
-

pkg/yqlib/doc/Equals.md

@@ -1,123 +0,0 @@
-This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.
-
-```
-.a == .b
-```
-
-It is most often used with the select operator to find particular nodes:
-
-```
-select(.a == .b)
-```
-
-
-## Match string
-Given a sample.yml file of:
-```yaml
-- cat
-- goat
-- dog
-```
-then
-```bash
-yq eval '.[] | (. == "*at")' sample.yml
-```
-will output
-```yaml
-true
-true
-false
-```
-
-## Don't match string
-Given a sample.yml file of:
-```yaml
-- cat
-- goat
-- dog
-```
-then
-```bash
-yq eval '.[] | (. != "*at")' sample.yml
-```
-will output
-```yaml
-false
-false
-true
-```
-
-## Match number
-Given a sample.yml file of:
-```yaml
-- 3
-- 4
-- 5
-```
-then
-```bash
-yq eval '.[] | (. == 4)' sample.yml
-```
-will output
-```yaml
-false
-true
-false
-```
-
-## Dont match number
-Given a sample.yml file of:
-```yaml
-- 3
-- 4
-- 5
-```
-then
-```bash
-yq eval '.[] | (. != 4)' sample.yml
-```
-will output
-```yaml
-true
-false
-true
-```
-
-## Match nulls
-Running
-```bash
-yq eval --null-input 'null == ~'
-```
-will output
-```yaml
-true
-```
-
-## Non exisitant key doesn't equal a value
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b != "thing")' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
-## Two non existant keys are equal
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b == .c)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-

pkg/yqlib/doc/Keys.md

@@ -1,35 +0,0 @@
-# Keys
-
-Use the `keys` operator to return map keys or array indices. 
-## Map keys
-Given a sample.yml file of:
-```yaml
-dog: woof
-cat: meow
-```
-then
-```bash
-yq eval 'keys' sample.yml
-```
-will output
-```yaml
-- dog
-- cat
-```
-
-## Array keys
-Given a sample.yml file of:
-```yaml
-- apple
-- banana
-```
-then
-```bash
-yq eval 'keys' sample.yml
-```
-will output
-```yaml
-- 0
-- 1
-```
-

pkg/yqlib/doc/Select.md

@@ -1,38 +0,0 @@
-Select is used to filter arrays and maps by a boolean expression.
-## Select elements from array
-Given a sample.yml file of:
-```yaml
-- cat
-- goat
-- dog
-```
-then
-```bash
-yq eval '.[] | select(. == "*at")' sample.yml
-```
-will output
-```yaml
-cat
-goat
-```
-
-## Select and update matching values in map
-Given a sample.yml file of:
-```yaml
-a:
-  things: cat
-  bob: goat
-  horse: dog
-```
-then
-```bash
-yq eval '(.a.[] | select(. == "*at")) |= "rabbit"' sample.yml
-```
-will output
-```yaml
-a:
-  things: rabbit
-  bob: rabbit
-  horse: dog
-```
-

pkg/yqlib/doc/Subtract.md

@@ -1,110 +0,0 @@
-
-## Array subtraction
-Running
-```bash
-yq eval --null-input '[1,2] - [2,3]'
-```
-will output
-```yaml
-- 1
-```
-
-## Array subtraction with nested array
-Running
-```bash
-yq eval --null-input '[[1], 1, 2] - [[1], 3]'
-```
-will output
-```yaml
-- 1
-- 2
-```
-
-## Array subtraction with nested object
-Note that order of the keys does not matter
-
-Given a sample.yml file of:
-```yaml
-- a: b
-  c: d
-- a: b
-```
-then
-```bash
-yq eval '. - [{"c": "d", "a": "b"}]' sample.yml
-```
-will output
-```yaml
-- a: b
-```
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1
-b: 4
-```
-
-## Decrement numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] -= 1' sample.yml
-```
-will output
-```yaml
-a: 2
-b: 4
-```
-

pkg/yqlib/doc/headers/Add.md

@@ -1,6 +0,0 @@
-Add behaves differently according to the type of the LHS:
-- arrays: concatenate
-- number scalars: arithmetic addition
-- string scalars: concatenate
-
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.

pkg/yqlib/doc/headers/Create, Collect into Object.md

@@ -1 +0,0 @@
-This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.

pkg/yqlib/doc/headers/Delete.md

@@ -1 +0,0 @@
-Deletes matching entries in maps or arrays.

pkg/yqlib/doc/headers/Env Variable Operators.md

@@ -1,2 +0,0 @@
-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.
-

pkg/yqlib/doc/headers/Equals.md

@@ -1,12 +0,0 @@
-This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.
-
-```
-.a == .b
-```
-
-It is most often used with the select operator to find particular nodes:
-
-```
-select(.a == .b)
-```
-

pkg/yqlib/doc/headers/Keys.md

@@ -1,3 +0,0 @@
-# Keys
-
-Use the `keys` operator to return map keys or array indices. 

pkg/yqlib/doc/headers/Multiply (Merge).md

@@ -1,20 +0,0 @@
-Like the multiple operator in jq, depending on the operands, this multiply operator will do different things. Currently numbers, arrays and objects are supported.
-
-## Objects and arrays - merging
-Objects are merged deeply matching on matching keys. By default, array values override and are not deeply merged.
-
-Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
-
-### Merge Flags
-You can control how objects are merged by using one or more of the following flags. Multiple flags can be used together, e.g. `.a *+? .b`.  See examples below
-
-- `+` to append arrays
-- `?` to only merge existing fields
-- `d` to deeply merge arrays
-
-### Merging files
-Note the use of `eval-all` to ensure all documents are loaded into memory.
-
-```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
-```

pkg/yqlib/doc/headers/Select.md

@@ -1 +0,0 @@
-Select is used to filter arrays and maps by a boolean expression.

pkg/yqlib/doc/headers/String Operators.md

@@ -1,44 +0,0 @@
-# String Operators
-
-## RegEx
-This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.
-
-
-# String blocks, bash and newlines
-Bash is notorious for chomping on precious trailing newline characters, making it tricky to set strings with newlines properly. In particular, the `$( exp )` _will trim trailing newlines_.
-
-For instance to get this yaml:
-
-```
-a: |
-  cat
-```
-
-Using `$( exp )` wont work, as it will trim the trailing new line.
-
-```
-m=$(echo "cat\n") yq e -n '.a = strenv(m)'
-a: cat
-```
-
-However, using printf works:
-```
-printf -v m "cat\n" ; m="$m" yq e -n '.a = strenv(m)'
-a: |
-  cat
-```
-
-As well as having multiline expressions:
-```
-m="cat
-"  yq e -n '.a = strenv(m)'
-a: |
-  cat
-```
-
-Similarly, if you're trying to set the content from a file, and want a trailing new line:
-
-```
-IFS= read -rd '' output < <(cat my_file)
-output=$output ./yq e '.data.values = strenv(output)' first.yml
-```

pkg/yqlib/doc/headers/Union.md

@@ -1 +0,0 @@
-This operator is used to combine different results together.

pkg/yqlib/doc/headers/Unique.md

@@ -1 +0,0 @@
-This is used to filter out duplicated items in an array.

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

@@ -0,0 +1,325 @@
+# Add
+
+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`.
+
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Concatenate arrays
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq '.a + .b' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- 3
+- 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
+a:
+  - 1
+  - 2
+```
+then
+```bash
+yq '.a + null' sample.yml
+```
+will output
+```yaml
+- 1
+- 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
+a:
+  - dog: woof
+```
+then
+```bash
+yq '.a + {"cat": "meow"}' sample.yml
+```
+will output
+```yaml
+- dog: woof
+- cat: meow
+```
+
+## Relative append
+Given a sample.yml file of:
+```yaml
+a:
+  a1:
+    b:
+      - cat
+  a2:
+    b:
+      - dog
+  a3: {}
+```
+then
+```bash
+yq '.a[].b += ["mouse"]' sample.yml
+```
+will output
+```yaml
+a:
+  a1:
+    b:
+      - cat
+      - mouse
+  a2:
+    b:
+      - dog
+      - mouse
+  a3:
+    b:
+      - mouse
+```
+
+## String concatenation
+Given a sample.yml file of:
+```yaml
+a: cat
+b: meow
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: catmeow
+b: meow
+```
+
+## Number addition - float
+If the lhs or rhs are floats then the expression will be calculated with floats.
+
+Given a sample.yml file of:
+```yaml
+a: 3
+b: 4.9
+```
+then
+```bash
+yq '.a = .a + .b' sample.yml
+```
+will output
+```yaml
+a: 7.9
+b: 4.9
+```
+
+## Number addition - int
+If both the lhs and rhs are ints then the expression will be calculated with ints.
+
+Given a sample.yml file of:
+```yaml
+a: 3
+b: 4
+```
+then
+```bash
+yq '.a = .a + .b' sample.yml
+```
+will output
+```yaml
+a: 7
+b: 4
+```
+
+## Increment numbers
+Given a sample.yml file of:
+```yaml
+a: 3
+b: 5
+```
+then
+```bash
+yq '.[] += 1' sample.yml
+```
+will output
+```yaml
+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 --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

@@ -1,5 +1,13 @@
+# Alternative (Default value)
+
 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
@@ -7,7 +15,7 @@ a: bridge
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -21,7 +29,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -35,7 +43,7 @@ a: ~
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +57,7 @@ a: false
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -64,7 +72,7 @@ b: cat
 ```
 then
 ```bash
-yq eval '.a // .b' sample.yml
+yq '.a // .b' sample.yml
 ```
 will output
 ```yaml

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

@@ -1,8 +1,16 @@
+# Anchor and Alias Operators
+
 Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference (or expands) aliases and remove anchor names).
 
 `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
 
@@ -23,7 +31,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -53,7 +61,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -85,7 +93,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -101,7 +109,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq eval '.a | anchor' sample.yml
+yq '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -115,7 +123,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a anchor = "foobar"' sample.yml
+yq '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -130,7 +138,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a anchor |= .b' sample.yml
+yq '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -146,7 +154,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq eval '.a | alias' sample.yml
+yq '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -161,7 +169,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = "meow"' sample.yml
+yq '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -177,7 +185,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = ""' sample.yml
+yq '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -194,7 +202,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a alias |= .f' sample.yml
+yq '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -211,7 +219,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -227,7 +235,7 @@ a: mike
 ```
 then
 ```bash
-yq eval 'explode(.a)' sample.yml
+yq 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -243,7 +251,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -276,7 +284,7 @@ foobar:
 ```
 then
 ```bash
-yq eval 'explode(.)' sample.yml
+yq 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -315,7 +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

@@ -1,8 +1,22 @@
+# Assign (Update)
+
+This operator is used to update node values. It can be used in either the:
+
+### plain form: `=`
+Which will assign the LHS node values to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.
+
+### relative form: `|=`
+This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
 
 ## 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
@@ -20,7 +34,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a |= .b' sample.yml
+yq '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +51,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] |= . * 2' sample.yml
+yq '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -76,7 +90,7 @@ b: sibling
 ```
 then
 ```bash
-yq eval '.a = .b' sample.yml
+yq '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -93,13 +107,13 @@ 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
@@ -110,7 +124,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b = "frog"' sample.yml
+yq '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -128,7 +142,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b |= "frog"' sample.yml
+yq '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -136,7 +150,9 @@ a:
   b: frog
 ```
 
-## Update selected results
+## Update deeply selected results
+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
 a:
@@ -145,7 +161,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +179,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -179,11 +195,28 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b |= "bogs"' sample.yml
+yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: bogs}}
+a:
+  b: bogs
+```
+
+## Update node value that has an anchor
+Anchor will remaple
+
+Given a sample.yml file of:
+```yaml
+a: &cool cat
+```
+then
+```bash
+yq '.a = "dog"' sample.yml
+```
+will output
+```yaml
+a: &cool dog
 ```
 
 ## Update empty object and array
@@ -193,10 +226,12 @@ 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
 ```
 

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

@@ -1,3 +1,5 @@
+# Boolean Operators
+
 The `or` and `and` operators take two parameters and return a boolean result. 
 
 `not` flips a boolean from true to false, or vice versa. 
@@ -8,10 +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
@@ -21,7 +35,7 @@ true
 ## `and` example
 Running
 ```bash
-yq eval --null-input 'true and false'
+yq --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -40,7 +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
@@ -58,7 +72,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -72,7 +86,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -91,7 +105,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
+yq '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -107,7 +121,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -121,7 +135,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -140,7 +154,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
+yq '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -151,7 +165,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq eval --null-input 'true | not'
+yq --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -161,7 +175,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq eval --null-input 'false | not'
+yq --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -171,7 +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
@@ -181,7 +195,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq eval --null-input '"" | not'
+yq --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -191,7 +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
@@ -201,7 +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
@@ -211,7 +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

@@ -1,14 +1,20 @@
+# Comment Operators
+
 Use these comment operators to set or retrieve comments.
 
 Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
 
-
 ### plain form: `=`
 This will assign the LHS nodes comments to the expression on the RHS. The RHS is run against the matching nodes in the pipeline
 
 ### 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
 Given a sample.yml file of:
@@ -17,7 +23,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a lineComment="single"' sample.yml
+yq '.a line_comment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +38,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '.. lineComment |= .' sample.yml
+yq '.. line_comment |= .' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +53,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. headComment="single"' sample.yml
+yq '. head_comment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -63,12 +69,11 @@ a: cat
 ```
 then
 ```bash
-yq eval '. footComment=.a' sample.yml
+yq '. foot_comment=.a' sample.yml
 ```
 will output
 ```yaml
 a: cat
-
 # cat
 ```
 
@@ -80,7 +85,7 @@ b: dog # leave this
 ```
 then
 ```bash
-yq eval '.a lineComment=""' sample.yml
+yq '.a line_comment=""' sample.yml
 ```
 will output
 ```yaml
@@ -99,7 +104,7 @@ b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq '... comments=""' sample.yml
 ```
 will output
 ```yaml
@@ -111,10 +116,11 @@ 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
@@ -124,28 +130,58 @@ meow
 ## Get head comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
+
 a: cat # meow
+
+# have a great day
 ```
 then
 ```bash
-yq eval '. | headComment' sample.yml
+yq '. | head_comment' sample.yml
 ```
 will output
 ```yaml
+welcome!
+```
 
+## Head comment with document split
+Given a sample.yml file of:
+```yaml
+# welcome!
+---
+# bob
+a: cat # meow
+
+# have a great day
+```
+then
+```bash
+yq 'head_comment' sample.yml
+```
+will output
+```yaml
+welcome!
+bob
 ```
 
 ## Get foot comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
+
 a: cat # meow
+
+# have a great day
+# no really
 ```
 then
 ```bash
-yq eval '. | footComment' sample.yml
+yq '. | foot_comment' sample.yml
 ```
 will output
 ```yaml
-
+have a great day
+no really
 ```
 

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

@@ -1,3 +1,12 @@
+# Contains
+
+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
@@ -10,7 +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
@@ -29,7 +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
@@ -48,7 +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
@@ -62,7 +71,7 @@ foobar
 ```
 then
 ```bash
-yq eval 'contains("bar")' sample.yml
+yq 'contains("bar")' sample.yml
 ```
 will output
 ```yaml
@@ -76,7 +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

@@ -1,8 +1,17 @@
+# Create, Collect into Object
+
 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
@@ -16,7 +25,7 @@ name: Mike
 ```
 then
 ```bash
-yq eval '{"wrap": .}' sample.yml
+yq '{"wrap": .}' sample.yml
 ```
 will output
 ```yaml
@@ -34,7 +43,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +66,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -70,10 +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 https://pkg.go.dev/time#pkg-constants for examples of formatting options.
+
+
+## Timezones
+This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
+
+
+## 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/date-time-operators) 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

@@ -1,4 +1,13 @@
+# Delete
+
 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
@@ -7,7 +16,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.b)' sample.yml
+yq 'del(.b)' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +32,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.a.a1)' sample.yml
+yq 'del(.a.a1)' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +49,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[1])' sample.yml
+yq 'del(.[1])' sample.yml
 ```
 will output
 ```yaml
@@ -56,7 +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
@@ -71,7 +80,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.c)' sample.yml
+yq 'del(.c)' sample.yml
 ```
 will output
 ```yaml
@@ -88,7 +97,7 @@ c: bat
 ```
 then
 ```bash
-yq eval 'del( .[] | select(. == "*at") )' sample.yml
+yq 'del( .[] | select(. == "*at") )' sample.yml
 ```
 will output
 ```yaml
@@ -106,7 +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

@@ -1,4 +1,13 @@
+# Document Index
+
 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
@@ -8,7 +17,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | documentIndex' sample.yml
+yq '.a | document_index' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +35,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | di' sample.yml
+yq '.a | di' sample.yml
 ```
 will output
 ```yaml
@@ -44,7 +53,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(documentIndex == 1)' sample.yml
+yq 'select(document_index == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +69,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(di == 1)' sample.yml
+yq 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -76,7 +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

@@ -0,0 +1,440 @@
+# Encoder / Decoder
+
+Encode operators will take the piped in object structure and encode it as a string in the desired format. The decode operators do the opposite, they take a formatted string and decode it into the relevant object structure.
+
+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 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 | from_props  | to_props/@props |
+| CSV |  | to_csv/@csv |
+| TSV |  | to_tsv/@tsv |
+| XML | from_xml | 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). 
+
+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
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | to_json)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: |
+  {
+    "cool": "thing"
+  }
+```
+
+## Encode value as json string, on one line
+Pass in a 0 indent to print json on a single line.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | to_json(0))' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: '{"cool":"thing"}'
+```
+
+## Encode value as json string, on one line shorthand
+Pass in a 0 indent to print json on a single line.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | @json)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: '{"cool":"thing"}'
+```
+
+## Decode a json encoded string
+Keep in mind JSON is a subset of YAML. If you want idiomatic yaml, pipe through the style operator to clear out the JSON styling.
+
+Given a sample.yml file of:
+```yaml
+a: '{"cool":"thing"}'
+```
+then
+```bash
+yq '.a | from_json | ... style=""' sample.yml
+```
+will output
+```yaml
+cool: thing
+```
+
+## Encode value as props string
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | @props)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+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 |= from_props' sample.yml
+```
+will output
+```yaml
+a:
+  cats: great
+  dogs: cool as well
+```
+
+## Encode value as yaml string
+Indent defaults to 2
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    bob: dylan
+```
+then
+```bash
+yq '.b = (.a | to_yaml)' sample.yml
+```
+will output
+```yaml
+a:
+  cool:
+    bob: dylan
+b: |
+  cool:
+    bob: dylan
+```
+
+## Encode value as yaml string, with custom indentation
+You can specify the indentation level as the first parameter.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    bob: dylan
+```
+then
+```bash
+yq '.b = (.a | to_yaml(8))' sample.yml
+```
+will output
+```yaml
+a:
+  cool:
+    bob: dylan
+b: |
+  cool:
+          bob: dylan
+```
+
+## Decode a yaml encoded string
+Given a sample.yml file of:
+```yaml
+a: 'foo: bar'
+```
+then
+```bash
+yq '.b = (.a | from_yaml)' sample.yml
+```
+will output
+```yaml
+a: 'foo: bar'
+b:
+  foo: bar
+```
+
+## Update a multiline encoded yaml string
+Given a sample.yml file of:
+```yaml
+a: |
+  foo: bar
+  baz: dog
+
+```
+then
+```bash
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+```
+will output
+```yaml
+a: |
+  foo: cat
+  baz: dog
+```
+
+## Update a single line encoded yaml string
+Given a sample.yml file of:
+```yaml
+a: 'foo: bar'
+```
+then
+```bash
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+```
+will output
+```yaml
+a: 'foo: cat'
+```
+
+## Encode array of scalars as csv string
+Scalars are strings, numbers and booleans.
+
+Given a sample.yml file of:
+```yaml
+- cat
+- thing1,thing2
+- true
+- 3.40
+```
+then
+```bash
+yq '@csv' sample.yml
+```
+will output
+```yaml
+cat,"thing1,thing2",true,3.40
+```
+
+## Encode array of arrays as csv string
+Given a sample.yml file of:
+```yaml
+- - cat
+  - thing1,thing2
+  - true
+  - 3.40
+- - dog
+  - thing3
+  - false
+  - 12
+```
+then
+```bash
+yq '@csv' sample.yml
+```
+will output
+```yaml
+cat,"thing1,thing2",true,3.40
+dog,thing3,false,12
+```
+
+## Encode array of array scalars as tsv string
+Scalars are strings, numbers and booleans.
+
+Given a sample.yml file of:
+```yaml
+- - cat
+  - thing1,thing2
+  - true
+  - 3.40
+- - dog
+  - thing3
+  - false
+  - 12
+```
+then
+```bash
+yq '@tsv' sample.yml
+```
+will output
+```yaml
+cat	thing1,thing2	true	3.40
+dog	thing3	false	12
+```
+
+## Encode value as xml string
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | to_xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi">
+  <foo>bar</foo>
+</cool>
+
+```
+
+## Encode value as xml string on a single line
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | @xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi"><foo>bar</foo></cool>
+
+```
+
+## Encode value as xml string with custom indentation
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '{"cat": .a | to_xml(1)}' sample.yml
+```
+will output
+```yaml
+cat: |
+  <cool id="hi">
+   <foo>bar</foo>
+  </cool>
+```
+
+## Decode a xml encoded string
+Given a sample.yml file of:
+```yaml
+a: <foo>bar</foo>
+```
+then
+```bash
+yq '.b = (.a | from_xml)' sample.yml
+```
+will output
+```yaml
+a: <foo>bar</foo>
+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

@@ -1,4 +1,13 @@
+# Entries
+
 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
@@ -7,7 +16,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -25,7 +34,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -42,7 +51,7 @@ null
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -56,7 +65,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +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
@@ -90,7 +99,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
+yq 'with_entries(.key |= "KEY_" + .)' sample.yml
 ```
 will output
 ```yaml
@@ -108,7 +117,7 @@ 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

@@ -0,0 +1,262 @@
+# Env Variable Operators
+
+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 --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: cat meow
+```
+
+## Read boolean environment variable
+Running
+```bash
+myenv="true" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: true
+```
+
+## Read numeric environment variable
+Running
+```bash
+myenv="12" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: 12
+```
+
+## Read yaml environment variable
+Running
+```bash
+myenv="{b: fish}" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: {b: fish}
+```
+
+## Read boolean environment variable as a string
+Running
+```bash
+myenv="true" yq --null-input '.a = strenv(myenv)'
+```
+will output
+```yaml
+a: "true"
+```
+
+## Read numeric environment variable as a string
+Running
+```bash
+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
+cat: meow
+dog: woof
+```
+then
+```bash
+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

@@ -0,0 +1,139 @@
+# Equals / Not Equals
+
+This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
+
+```
+.a == .b
+```
+
+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
+- cat
+- goat
+- dog
+```
+then
+```bash
+yq '.[] | (. == "*at")' sample.yml
+```
+will output
+```yaml
+true
+true
+false
+```
+
+## Don't match string
+Given a sample.yml file of:
+```yaml
+- cat
+- goat
+- dog
+```
+then
+```bash
+yq '.[] | (. != "*at")' sample.yml
+```
+will output
+```yaml
+false
+false
+true
+```
+
+## Match number
+Given a sample.yml file of:
+```yaml
+- 3
+- 4
+- 5
+```
+then
+```bash
+yq '.[] | (. == 4)' sample.yml
+```
+will output
+```yaml
+false
+true
+false
+```
+
+## Don't match number
+Given a sample.yml file of:
+```yaml
+- 3
+- 4
+- 5
+```
+then
+```bash
+yq '.[] | (. != 4)' sample.yml
+```
+will output
+```yaml
+true
+false
+true
+```
+
+## Match nulls
+Running
+```bash
+yq --null-input 'null == ~'
+```
+will output
+```yaml
+true
+```
+
+## Non existent key doesn't equal a value
+Given a sample.yml file of:
+```yaml
+a: frog
+```
+then
+```bash
+yq 'select(.b != "thing")' sample.yml
+```
+will output
+```yaml
+a: frog
+```
+
+## Two non existent keys are equal
+Given a sample.yml file of:
+```yaml
+a: frog
+```
+then
+```bash
+yq 'select(.b == .c)' sample.yml
+```
+will output
+```yaml
+a: frog
+```
+