Split printer!

wip split
2026-08-24 16:39:58 +08:00 · 2021-10-30 09:56:47 +11:00 · 2021-10-29 20:53:28 +11:00 · 2021-10-29 20:49:06 +11:00 · 2021-10-29 16:07:17 +11:00 · 2021-10-29 14:14:39 +11:00
360 changed files with 4284 additions and 19028 deletions
@@ -26,7 +26,7 @@ country: Australia
 And we run a command:

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

 it could output
@@ -1,22 +0,0 @@
-# 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
@@ -1,70 +0,0 @@
-# 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
@@ -1,82 +0,0 @@
-name: Release Docker
-
-on:
-  release:
-    types: [released]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-jobs:
-  publishDocker:
-    environment: dockerhub
-    env:
-      IMAGE_NAME: mikefarah/yq
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
-        with:
-          platforms: all
-
-      - name: Set up Docker Buildx
-        id: buildx
-        uses: docker/setup-buildx-action@v2
-        with:
-          version: latest
-
-      - name: Available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
-
-      - name: Build and push image
-        run: |
-          echo "GithubRef: ${GITHUB_REF}"
-          VERSION=${GITHUB_REF##*/}
-          echo "VERSION: ${VERSION}"
-          IMAGE_VERSION=${VERSION:1}
-          echo "IMAGE_VERSION: ${IMAGE_VERSION}"
-
-          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
-
-          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
-          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
-          docker buildx build \
-            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
-            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
-            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
-            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.licenses=MIT" \
-            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
-            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
-            --label "org.opencontainers.image.title=yq" \
-            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
-            --platform "${PLATFORMS}" \
-            --pull \
-            --push \
-            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
-            -t "${IMAGE_NAME}:4" \
-            -t "${IMAGE_NAME}:latest" \
-            .
-          
-          cd github-action
-          docker buildx build \
-            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
-            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
-            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
-            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.licenses=MIT" \
-            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
-            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
-            --label "org.opencontainers.image.title=yq" \
-            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
-            --platform "${PLATFORMS}" \
-            --pull \
-            --push \
-            -t "${IMAGE_NAME}:${IMAGE_VERSION}-githubaction" \
-            -t "${IMAGE_NAME}:4-githubaction" \
-            -t "${IMAGE_NAME}:latest-githubaction" \
-            .
@@ -1,8 +1,5 @@
 name: Build
-on: [push, pull_request]
-permissions:
-  contents: read
-
+on: [push]
 jobs:

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

-    - name: Set up Go 1.19
-      uses: actions/setup-go@v3
+    - name: Set up Go 1.15
+      uses: actions/setup-go@v1
      with:
-        go-version: 1.19
+        go-version: 1.15
      id: go

    - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v2

    - name: Get dependencies
      run: |
@@ -27,9 +24,8 @@ jobs:
            dep ensure
        fi

-    - name: Check the build
-      shell: bash -l {0}
+    - name: Download deps
      run: |
        export PATH=${PATH}:`go env GOPATH`/bin
        scripts/devtools.sh
-        make local build
+        make local build
@@ -3,17 +3,15 @@ on:
  push:
    tags:
      - 'v*'
-      - 'draft-*'

 jobs:
  publishGitRelease:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
        with:
-          go-version: '^1.19'
-          check-latest: true
+          go-version: '^1.17.2'
      - name: Compile man page markup
        id: gen-man-page-md
        run: |
@@ -23,7 +21,7 @@ jobs:
      - 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
@@ -37,18 +35,62 @@ jobs:
            --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 install github.com/mitchellh/gox@v1.0.1
+          go get github.com/mitchellh/gox
          mkdir -p build
          cp yq.1 build/yq.1
          ./scripts/xcompile.sh

-      - name: Release
-        uses: softprops/action-gh-release@v1
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1.0.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
-          files: build/*
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
          draft: true
-          fail_on_unmatched_files: 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 .
+    
@@ -1,11 +1,5 @@
 name: Test Yq Action
-on: 
-  push:
-  workflow_dispatch:
-
-permissions:
-  contents: read
-
+on: [push]
 jobs:

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

    steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
      - name: Get test
-        id: get_value
        uses: mikefarah/yq@master
        with:
-          cmd: yq '.test' examples/multiline-text.yaml
-      - name: Multiline test
-        run: echo "### It was [${{ steps.get_value.outputs.result }}]" >> $GITHUB_STEP_SUMMARY
+          cmd: yq eval '.a' examples/data1.yaml
      - name: Write inplace test
        id: lookupSdkVersion
        uses: mikefarah/yq@master
        with:
-          cmd: yq -i '.b.c = 5' examples/sample.yaml
+          cmd: yq eval -i '.a.b = 5' examples/data1.yaml
@@ -41,7 +41,6 @@ yq*.snap

 test.yml
 test*.yml
-test*.yaml
 0.yml
 1.yml
 2.yml
@@ -49,16 +48,4 @@ test*.yaml

 # man page
 man.md
-yq.1
-
-# debian pkg
-_build
-debian/files
-
-# intellij
-/.idea
-
-# vscode
-.vscode
-
-yq3
+yq.1
@@ -1,40 +0,0 @@
-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"
@@ -1,5 +1,3 @@
-# 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
@@ -8,33 +6,3 @@
 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.
@@ -1,28 +1,30 @@
-FROM golang:1.19.2 as builder
+FROM golang:1.17 as builder

 WORKDIR /go/src/mikefarah/yq

-COPY . .
+COPY . /go/src/mikefarah/yq

 RUN CGO_ENABLED=0 go build .
-# RUN ./scripts/test.sh -- this too often times out in the github pipeline.
+RUN ./scripts/test.sh
 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
-LABEL maintainer="Mike Farah <mikefarah@users.noreply.github.com>"
+
+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/

 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
+RUN chmod +x /usr/bin/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
+ARG VERSION=none
+LABEL version=${VERSION}

 USER yq

+WORKDIR /workdir
+
 ENTRYPOINT ["/usr/bin/yq"]
@@ -1,4 +1,4 @@
-FROM golang:1.19.2
+FROM golang:1.17

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

@@ -1,5 +1,3 @@
-The MIT License (MIT)
-
 Copyright (c) 2017 Mike Farah

 Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -2,7 +2,6 @@ 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

@@ -34,7 +33,7 @@ clean:

 ## prefix before other make targets to run in your local dev environment
 local: | quiet
-	@$(eval ENGINERUN= )
+	@$(eval DOCKRUN= )
 	@mkdir -p tmp
 	@touch tmp/dev_image_id
 quiet: # this is silly but shuts up 'Nothing to be done for `local`'
@@ -43,9 +42,9 @@ 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
-	@${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
+	@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

 # ----------------------------------------------
 # build
@@ -55,61 +54,57 @@ build: build/dev
 .PHONY: build/dev
 build/dev: test *.go
 	@mkdir -p bin/
-	${ENGINERUN} go build --ldflags "$(LDFLAGS)"
-	${ENGINERUN} bash ./scripts/acceptance.sh
+	${DOCKRUN} go build --ldflags "$(LDFLAGS)"
+	${DOCKRUN} bash ./scripts/acceptance.sh

 ## Compile the project for multiple OS and Architectures.
 xcompile: check
 	@rm -rf build/
 	@mkdir -p build
-	${ENGINERUN} bash ./scripts/xcompile.sh
+	${DOCKRUN} bash ./scripts/xcompile.sh
 	@find build -type d -exec chmod 755 {} \; || :
 	@find build -type f -exec chmod 755 {} \; || :

 .PHONY: install
 install: build
-	${ENGINERUN} go install
+	${DOCKRUN} 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
-	@mkdir -p vendor
-	${ENGINERUN} go mod vendor
+	${DOCKRUN} go mod vendor

 # ----------------------------------------------
 # develop and test

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

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

+.PHONY: secure
+secure: 
+	${DOCKRUN} bash ./scripts/secure.sh

 .PHONY: test
 test: check
-	${ENGINERUN} bash ./scripts/test.sh
+	${DOCKRUN} bash ./scripts/test.sh

 .PHONY: cover
 cover: check
 	@rm -rf cover/
 	@mkdir -p cover
-	${ENGINERUN} bash ./scripts/coverage.sh
+	${DOCKRUN} bash ./scripts/coverage.sh
 	@find cover -type d -exec chmod 755 {} \; || :
 	@find cover -type f -exec chmod 644 {} \; || :


 .PHONY: release
 release: xcompile
-	${ENGINERUN} bash ./scripts/publish.sh
+	${DOCKRUN} bash ./scripts/publish.sh

 # ----------------------------------------------
 # utilities
@@ -29,7 +29,7 @@ endif

 DEV_IMAGE := ${PROJECT}_dev

-ENGINERUN := ${ENGINE} run --rm \
+DOCKRUN := docker run --rm \
 	-e LDFLAGS="${LDFLAGS}" \
 	-e GITHUB_TOKEN="${GITHUB_TOKEN}" \
 	-v ${ROOT}/vendor:/go/src \
@@ -1,65 +1,56 @@
 # 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)
+![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)


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

-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.
+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.

 ## Quick Usage Guide

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

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

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

 Update using environment variables
 ```bash
-NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq e -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 -i '
+yq e -i '
  .a.b[0].c = "cool" |
  .x.y.z = "foobar" |
  .person.name = strenv(NAME)
 ' file.yaml
 ```

-Convert JSON to YAML
-```bash
-yq -P sample.json
-```
-
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more examples.
-
-Take a look at the discussions for [common questions](https://github.com/mikefarah/yq/discussions/categories/q-a), and [cool ideas](https://github.com/mikefarah/yq/discussions/categories/show-and-tell)
+See the [documentation](https://mikefarah.gitbook.io/yq/) for more.

 ## Install

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

 ### wget
-Use wget to download, gzipped pre-compiled binaries:
+Use wget to download the pre-compiled binaries:

 #### Compressed via tar.gz
 ```bash
@@ -76,54 +67,55 @@ wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /

 For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64

-Use VERSION=latest to always get the latest version:
-
-```bash
-wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq &&\
-    chmod +x /usr/bin/yq
-```
-
 ### MacOS / Linux via Homebrew:
 Using [Homebrew](https://brew.sh/)
 ```
 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 '.a.path'
+sudo cat /etc/myfile | yq e '.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 '.a.path = "value"' | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq '.a.path = "value"' | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```

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

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

 #### Pipe in via STDIN:
@@ -131,11 +123,7 @@ podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression
 You'll need to pass the `-i\--interactive` flag to docker:

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

 #### Run commands interactively:
@@ -144,10 +132,6 @@ podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 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
@@ -156,89 +140,45 @@ yq() {
 }
 ```

-```bash
-yq() {
-  podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
-}
-```
+
 #### Running as root:

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


 ```
 docker run --user="root" -it --entrypoint sh mikefarah/yq
 ```

-```
-podman run --user="root" -it --entrypoint sh mikefarah/yq
-```
-
-Or, in your Dockerfile:
+Or, in your docker file:

 ```
 FROM mikefarah/yq

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

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

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

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

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

-
-### Nix
-
-```
-nix profile install nixpkgs#yq-go
-```
-
-See [here](https://search.nixos.org/packages?channel=unstable&show=yq-go&from=0&size=50&sort=relevance&type=packages&query=yq-go)
-
-
-### Webi
+# Webi

 ```
 webi yq
@@ -247,12 +187,6 @@ 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)
@@ -261,13 +195,6 @@ choco install yq
 ```
 Supported by @chillum (https://chocolatey.org/packages/yq)

-and
-
-### Winget
-winget install yq
-
-https://winget.run/pkg/MikeFarah/yq
-
 ### Mac:
 Using [MacPorts](https://www.macports.org/)
 ```
@@ -297,23 +224,19 @@ 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, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
+- Uses similar syntax as `jq` but works with YAML and JSON 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
- [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)
+- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
+- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
 - Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
- [Update inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update yaml 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/ndjson](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
- [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
- [Convert to/from properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
- [Convert to/from csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
+- [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)
 - [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)
@@ -327,46 +250,33 @@ 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:
-  completion       Generate the autocompletion script for the specified shell
-  eval             (default) Apply the expression to each document in each yaml file in sequence
+  eval             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 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")
+  -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

 Use "yq [command] --help" for more information about a command.
 ```
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
- Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
+- Powershell has its own...opinions: 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.
@@ -1,41 +0,0 @@
-#!/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
@@ -1,225 +1,12 @@
 #!/bin/bash

 setUp() {
-  rm test*.yml 2>/dev/null || true
-  rm .xyz 2>/dev/null || true
-  rm instructions.txt 2>/dev/null || true
+  rm test*.yml || 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=$(cat test.yml | ./yq e ".a")
-  assertEquals 123 "$X"
-
-  X=$(cat test.yml | ./yq ea ".a")
-  assertEquals 123 "$X"
-
-  X=$(cat test.yml | ./yq ".a")
+  X=$(./yq e '.a' test.yml)
  assertEquals 123 "$X"
 }

@@ -232,15 +19,6 @@ 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
@@ -250,40 +28,6 @@ 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=$(./yq e '.z' test.yml)
@@ -296,12 +40,6 @@ testBasicExitStatus() {
  assertEquals 1 "$?"
 }

-testBasicExitStatusNoEval() {
-  echo "a: cat" > test.yml
-  X=$(./yq -e '.z' test.yml 2&>/dev/null)
-  assertEquals 1 "$?"
-}
-
 testBasicExtractFieldWithSeperator() {
    cat >test.yml <<EOL
 ---
@@ -331,26 +69,4 @@ 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" "$X"
-}
-
-
-
 source ./scripts/shunit2
@@ -1,9 +0,0 @@
-#!/bin/bash
-
-testCompletionRuns() {
-    result=$(./yq __complete "" 2>&1)
-    assertEquals 0 $?
-    assertContains "$result" "Completion ended with directive:"
-}
-
-source ./scripts/shunit2
@@ -9,7 +9,7 @@ EOL

 testEmptyEval() {
  X=$(./yq e test.yml)
-  expected="# comment"
+  expected=$(cat test.yml)
  assertEquals 0 $?
  assertEquals "$expected" "$X"
 }
@@ -1,43 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-  
-}
-
-testLineCountFirstLineComment() {
-  cat >test.yml <<EOL
-#test123 
-abc: 123 
-test123: 123123 
-#comment 
-lalilu: lalilu
-EOL
-
-  X=$(./yq '.lalilu | line' --header-preprocess=false < test.yml)
-  assertEquals "5" "$X"
-}
-
-testArrayOfDocs() {
-  cat >test.yml <<EOL
---
-# leading comment doc 1
-a: 1
---
-# leading comment doc 2
-a: 2
-EOL
-
-read -r -d '' expected << EOM
- # leading comment doc 1
-  a: 1
- # leading comment doc 2
-  a: 2
-EOM
-
-  X=$(./yq ea '[.]' --header-preprocess=false < test.yml)
-  assertEquals "$expected" "$X"
-
-}
-
-source ./scripts/shunit2
@@ -1,203 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml 2>/dev/null || true
-  rm test*.properties 2>/dev/null || true
-  rm test*.csv 2>/dev/null || true
-  rm test*.tsv 2>/dev/null || true
-  rm test*.xml 2>/dev/null || true
-}
-
-testInputProperties() {
-  cat >test.properties <<EOL
-mike.things = hello
-EOL
-
-  read -r -d '' expected << EOM
-mike:
-  things: hello
-EOM
-
-  X=$(./yq e -p=props test.properties)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=props test.properties)
-  assertEquals "$expected" "$X"
-}
-
-testInputPropertiesGitHubAction() {
-  cat >test.properties <<EOL
-mike.things = hello
-EOL
-
-  read -r -d '' expected << EOM
-mike:
-  things: hello
-EOM
-
-  X=$(cat /dev/null | ./yq e -p=props test.properties)
-  assertEquals "$expected" "$X"
-
-  X=$(cat /dev/null | ./yq ea -p=props test.properties)
-  assertEquals "$expected" "$X"
-}
-
-testInputCSV() {
-  cat >test.csv <<EOL
-fruit,yumLevel
-apple,5
-banana,4
-EOL
-
-  read -r -d '' expected << EOM
- fruit: apple
-  yumLevel: 5
- fruit: banana
-  yumLevel: 4
-EOM
-
-  X=$(./yq e -p=csv test.csv)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=csv test.csv)
-  assertEquals "$expected" "$X"
-}
-
-testInputCSVUTF8() {
-  read -r -d '' expected << EOM
- id: 1
-  first: john
-  last: smith
- id: 1
-  first: jane
-  last: smith
-EOM
-
-  X=$(./yq -p=csv utf8.csv)
-  assertEquals "$expected" "$X"
-}
-
-testInputTSV() {
-  cat >test.tsv <<EOL
-fruit	yumLevel
-apple	5
-banana	4
-EOL
-
-  read -r -d '' expected << EOM
- fruit: apple
-  yumLevel: 5
- fruit: banana
-  yumLevel: 4
-EOM
-
-  X=$(./yq e -p=t test.tsv)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=t test.tsv)
-  assertEquals "$expected" "$X"
-}
-
-
-
-
-testInputXml() {
-  cat >test.yml <<EOL
-<cat legs="4">BiBi</cat>
-EOL
-
-  read -r -d '' expected << EOM
-cat:
-  +content: BiBi
-  +legs: "4"
-EOM
-
-  X=$(./yq e -p=xml test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=xml test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testInputXmlNamespaces() {
-  cat >test.yml <<EOL
-<?xml version="1.0"?>
-<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
-</map>
-EOL
-
-  read -r -d '' expected << EOM
-+p_xml: version="1.0"
-map:
-  +xmlns: some-namespace
-  +xmlns:xsi: some-instance
-  +xsi:schemaLocation: some-url
-EOM
-
-  X=$(./yq e -p=xml test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=xml test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testInputXmlRoundtrip() {
-  cat >test.yml <<EOL
-<?xml version="1.0"?>
-<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
-<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
-EOL
-
-  read -r -d '' expected << EOM
-<?xml version="1.0"?>
-<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
-<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
-EOM
-
-  X=$(./yq -p=xml -o=xml test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -p=xml -o=xml test.yml)
-  assertEquals "$expected" "$X"
-}
-
-
-testInputXmlStrict() {
-  cat >test.yml <<EOL
-<?xml version="1.0"?>
-<!DOCTYPE root [
-<!ENTITY writer "Catherine.">
-<!ENTITY copyright "(r) Great">
-]>
-<root>
-    <item>&writer;&copyright;</item>
-</root>
-EOL
-
-  X=$(./yq -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
-  assertEquals 1 $?
-  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
-
-  X=$(./yq ea -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
-  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
-}
-
-testInputXmlGithubAction() {
-  cat >test.yml <<EOL
-<cat legs="4">BiBi</cat>
-EOL
-
-  read -r -d '' expected << EOM
-cat:
-  +content: BiBi
-  +legs: "4"
-EOM
-
-  X=$(cat /dev/null | ./yq e -p=xml test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(cat /dev/null | ./yq ea -p=xml test.yml)
-  assertEquals "$expected" "$X"
-}
-
-source ./scripts/shunit2
@@ -1,8 +1,5 @@
 #!/bin/bash

-
-# examples where header-preprocess is required
-
 setUp() {
  rm test*.yml || true
  cat >test.yml <<EOL
@@ -1,27 +0,0 @@
-#!/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
@@ -102,107 +102,4 @@ EOM
  assertEquals "$expected" "$X"
 }

-testOutputCSV() {
-  cat >test.yml <<EOL
- fruit: apple
-  yumLevel: 5
- fruit: banana
-  yumLevel: 4
-EOL
-
-  read -r -d '' expected << EOM
-fruit,yumLevel
-apple,5
-banana,4
-EOM
-
-  X=$(./yq -o=c test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -o=csv test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputTSV() {
-  cat >test.yml <<EOL
- fruit: apple
-  yumLevel: 5
- fruit: banana
-  yumLevel: 4
-EOL
-
-  read -r -d '' expected << EOM
-fruit	yumLevel
-apple	5
-banana	4
-EOM
-
-  X=$(./yq -o=t test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -o=tsv test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputXml() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
-EOL
-
-  read -r -d '' expected << EOM
-<a>
-  <b>
-    <c>cat</c>
-  </b>
-</a>
-EOM
-
-  X=$(./yq e --output-format=xml test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --output-format=xml test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputXmlShort() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
-EOL
-
-  read -r -d '' expected << EOM
-<a>
-  <b>
-    <c>cat</c>
-  </b>
-</a>
-EOM
-
-  X=$(./yq e --output-format=x test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --output-format=x test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputXmComplex() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat", "dog"], +f: meow}}
-EOL
-
-  read -r -d '' expected << EOM
-<a>
-  <b f="meow">
-    <c>cat</c>
-    <c>dog</c>
-  </b>
-</a>
-EOM
-
-  X=$(./yq e --output-format=x test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --output-format=x test.yml)
-  assertEquals "$expected" "$X"
-}
-
 source ./scripts/shunit2
@@ -1,70 +0,0 @@
-#!/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
@@ -25,56 +25,6 @@ EOM
  assertEquals "$expectedDoc2" "$doc2"
 }

-testBasicSplitWithNameCustomExtension() {
-  rm test*.yaml || true
-  cat >test.yml <<EOL
-a: test_doc1
--- 
-a: test_doc2
-EOL
-
-  ./yq e test.yml -s '.a + ".yaml"'
-
-  doc1=$(cat test_doc1.yaml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_doc2.yaml)
-  read -r -d '' expectedDoc2 << EOM
---
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-
-
-
-testSplitFromFile() {
-  cat >test.yml <<EOL
-a: test_doc1
--- 
-a: test_doc2
-EOL
-
-cat >test_splitExp.yml <<EOL
-.a
-EOL
-
-  ./yq test.yml --split-exp-file test_splitExp.yml
-
-  doc1=$(cat test_doc1.yml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_doc2.yml)
-  read -r -d '' expectedDoc2 << EOM
---
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
 testBasicSplitWithNameEvalAll() {
  cat >test.yml <<EOL
 a: test_doc1
@@ -12,6 +12,6 @@ outputs:
    description: "The complete result from the yq command being run"
 runs:
  using: 'docker'
-  image: 'docker://mikefarah/yq:4-githubaction'
+  image: 'github-action/Dockerfile'
  args:
    - ${{ inputs.cmd }}
@@ -0,0 +1,83 @@
+package cmd
+
+// import (
+// 	"strings"
+// 	"testing"
+
+// 	"github.com/mikefarah/yq/v3/test"
+// 	"github.com/spf13/cobra"
+// )
+
+// func getRootCommand() *cobra.Command {
+// 	return New()
+// }
+
+// func TestRootCmd(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+
+// 	if !strings.Contains(result.Output, "Usage:") {
+// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
+// 	}
+// }
+
+// func TestRootCmd_Help(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "--help")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+
+// 	if !strings.Contains(result.Output, "yq is a lightweight and portable command-line YAML processor. It aims to be the jq or sed of yaml files.") {
+// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
+// 	}
+// }
+
+// func TestRootCmd_VerboseLong(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "--verbose")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+
+// 	if !verbose {
+// 		t.Error("Expected verbose to be true")
+// 	}
+// }
+
+// func TestRootCmd_VerboseShort(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "-v")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+
+// 	if !verbose {
+// 		t.Error("Expected verbose to be true")
+// 	}
+// }
+
+// func TestRootCmd_VersionShort(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "-V")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+// 	if !strings.Contains(result.Output, "yq version") {
+// 		t.Error("expected version message to be printed out, but the message was not found.")
+// 	}
+// }
+
+// func TestRootCmd_VersionLong(t *testing.T) {
+// 	cmd := getRootCommand()
+// 	result := test.RunCmd(cmd, "--version")
+// 	if result.Error != nil {
+// 		t.Error(result.Error)
+// 	}
+// 	if !strings.Contains(result.Output, "yq version") {
+// 		t.Error("expected version message to be printed out, but the message was not found.")
+// 	}
+// }
@@ -1,11 +1,11 @@
 package cmd

+var leadingContentPreProcessing = true
 var unwrapScalar = true

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

 var exitStatus = false
 var forceColor = false
@@ -22,10 +22,5 @@ var prettyPrint = false
 var frontMatter = ""

 var splitFileExp = ""
-var splitFileExpFile = ""

 var completedSuccessfully = false
-
-var forceExpression = ""
-
-var expressionFile = ""
@@ -2,6 +2,8 @@ package cmd

 import (
 	"errors"
+	"fmt"
+	"os"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -38,36 +40,59 @@ Note that it consumes more memory than eval.
 	}
 	return cmdEvalAll
 }
-func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
+func evaluateAll(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 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
-
-	expression, args, err := initCommand(cmd, args)
-	if err != nil {
-		return err
-	}
+	stat, _ := os.Stdin.Stat()
+	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0

 	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 && splitFileExp != "" {
+		return fmt.Errorf("Write inplace cannot be used with split file")
+	}
+
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
 		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() {
-			if cmdError == nil {
-				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
-			}
-		}()
+		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"
 	}

 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -75,26 +100,17 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 		return err
 	}

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

-	printerWriter, err := configurePrinterWriter(format, out)
-	if err != nil {
-		return err
-	}
-	encoder := configureEncoder(format)
-
-	printer := yqlib.NewPrinter(encoder, printerWriter)
+	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)

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

 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -105,17 +121,22 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	}

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

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

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -12,7 +13,7 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "(default) Apply the expression to each document in each yaml file in sequence",
+		Short:   "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 
@@ -43,45 +44,65 @@ 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 yqlib.PrettyPrintExp
+		return prettyPrintExp
 	} else if prettyPrint {
-		return fmt.Sprintf("%v | %v", expression, yqlib.PrettyPrintExp)
+		return fmt.Sprintf("%v | %v", expression, prettyPrintExp)
 	}
 	return expression
 }

-func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
+func evaluateSequence(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 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()

-	var err error
+	fileInfo, _ := os.Stdout.Stat()

-	expression, args, err := initCommand(cmd, args)
-	if err != nil {
-		return err
+	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 && splitFileExp != "" {
+		return fmt.Errorf("Write inplace cannot be used with split file")
 	}

 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
 		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() {
-			if cmdError == nil {
-				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
-			}
-		}()
+		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+	}
+
+	// backwards compatibilty
+	if outputToJSON {
+		outputFormat = "json"
 	}

 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -89,28 +110,23 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 		return err
 	}

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

-	printer := yqlib.NewPrinter(encoder, printerWriter)
+	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)

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

 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -122,14 +138,20 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {

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

@@ -0,0 +1,28 @@
+package cmd
+
+import (
+	"io"
+
+	"github.com/mikefarah/yq/v4/pkg/yqlib"
+)
+
+func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) yqlib.PrinterWriter {
+
+	var printerWriter yqlib.PrinterWriter
+
+	if splitFileExp == "i" {
+		colorsEnabled = forceColor
+		printerWriter = yqlib.NewMultiPrinterWriter(nil, format)
+
+	} else if splitFileExp != "" {
+		colorsEnabled = forceColor
+		splitExp, err := yqlib.NewExpressionParser().ParseExpression(splitFileExp)
+		if err != nil {
+			return nil
+		}
+		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
+	} else {
+		printerWriter = yqlib.NewSinglePrinterWriter(out)
+	}
+	return printerWriter
+}
@@ -3,7 +3,6 @@ package cmd
 import (
 	"os"

-	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
 	logging "gopkg.in/op/go-logging.v1"
 )
@@ -14,30 +13,17 @@ 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
 			}
-			return evaluateSequence(cmd, args)
+			cmd.Println(cmd.UsageString())
+			return nil

 		},
 		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}`,
 			)
@@ -47,23 +33,10 @@ yq -P sample.json
 			if verbose {
 				backend.SetLevel(logging.DEBUG, "")
 			} else {
-				backend.SetLevel(logging.WARNING, "")
+				backend.SetLevel(logging.ERROR, "")
 			}

 			logging.SetBackend(backend)
-			yqlib.InitExpressionParser()
-			if (inputFormat == "x" || inputFormat == "xml") &&
-				outputFormat != "x" && outputFormat != "xml" &&
-				yqlib.ConfiguredXMLPreferences.AttributePrefix == "+" {
-				yqlib.GetLogger().Warning("The default xml-attribute-prefix will change in the v4.30 to `+@` to avoid " +
-					"naming conflicts with the default content name, directive name and proc inst prefix. If you need to keep " +
-					"`+` please set that value explicityly with --xml-attribute-prefix.")
-			}
-
-			//copy preference form global setting
-			yqlib.ConfiguredYamlPreferences.UnwrapScalar = unwrapScalar
-
-			yqlib.ConfiguredYamlPreferences.PrintDocSeparators = !noDocSeparators
 		},
 	}

@@ -75,39 +48,23 @@ yq -P sample.json
 		panic(err)
 	}

-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p|xml|x] output format type.")
-	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|props|p|xml|x] parse format for input. Note that json is a subset of yaml.")
-
-	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.AttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
-	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
-	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.StrictMode, "xml-strict-mode", false, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
-	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.KeepNamespace, "xml-keep-namespace", true, "enables keeping namespace after parsing attributes")
-	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.UseRawToken, "xml-raw-token", true, "enables using RawToken method instead Token. Commonly disables namespace translations. See https://pkg.go.dev/encoding/xml#Decoder.RawToken for details.")
-	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ProcInstPrefix, "xml-proc-inst-prefix", "+p_", "prefix for xml processing instructions (e.g. <?xml version=\"1\"?>)")
-	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.DirectiveName, "xml-directive-name", "+directive", "name for xml directives (e.g. <!DOCTYPE thing cat>)")
-	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipProcInst, "xml-skip-proc-inst", false, "skip over process instructions (e.g. <?xml version=\"1\"?>)")
-	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipDirectives, "xml-skip-directives", false, "skip over directives (e.g. <!DOCTYPE thing cat>)")
-
-	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
+	rootCmd.PersistentFlags().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().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 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(&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(&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().StringVarP(&forceExpression, "expression", "", "", "forcibly set the expression argument. Useful when yq argument detection thinks your expression is a file.")
-	rootCmd.PersistentFlags().BoolVarP(&yqlib.ConfiguredYamlPreferences.LeadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")
+	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(&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(),
@@ -42,7 +42,7 @@ $ yq shell-completion fish > ~/.config/fish/completions/yq.fish
 `,
 	DisableFlagsInUseLine: true,
 	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
-	Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
+	Args:                  cobra.ExactValidArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		var err error = nil
 		switch args[0] {
@@ -1,178 +0,0 @@
-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(evaluateTogether bool) (yqlib.Decoder, error) {
-	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
-	if err != nil {
-		return nil, err
-	}
-	switch yqlibInputFormat {
-	case yqlib.XMLInputFormat:
-		return yqlib.NewXMLDecoder(yqlib.ConfiguredXMLPreferences), nil
-	case yqlib.PropertiesInputFormat:
-		return yqlib.NewPropertiesDecoder(), nil
-	case yqlib.JsonInputFormat:
-		return yqlib.NewJSONDecoder(), nil
-	case yqlib.CSVObjectInputFormat:
-		return yqlib.NewCSVObjectDecoder(','), nil
-	case yqlib.TSVObjectInputFormat:
-		return yqlib.NewCSVObjectDecoder('\t'), nil
-	}
-	prefs := yqlib.ConfiguredYamlPreferences
-	prefs.EvaluateTogether = evaluateTogether
-	return yqlib.NewYamlDecoder(prefs), 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.NewJSONEncoder(indent, colorsEnabled)
-	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder(unwrapScalar)
-	case yqlib.CSVOutputFormat:
-		return yqlib.NewCsvEncoder(',')
-	case yqlib.TSVOutputFormat:
-		return yqlib.NewCsvEncoder('\t')
-	case yqlib.YamlOutputFormat:
-		return yqlib.NewYamlEncoder(indent, colorsEnabled, yqlib.ConfiguredYamlPreferences)
-	case yqlib.XMLOutputFormat:
-		return yqlib.NewXMLEncoder(indent, yqlib.ConfiguredXMLPreferences)
-	}
-	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
-}
@@ -11,7 +11,7 @@ var (
 	GitDescribe string

 	// Version is main version number that is being run at the moment.
-	Version = "4.29.2"
+	Version = "4.13.5"

 	// 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
@@ -1,112 +1,3 @@
-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
@@ -3,8 +3,7 @@ Section: devel
 Priority: optional
 Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Build-Depends: debhelper (>=10),
-               golang-1.17-go,
-               pandoc,
+               golang-1.15,
               rsync
 Standards-Version: 4.1.4
 Homepage: https://github.com/mikefarah/yq.git
@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 #
-# Copyright (C) 2018-2021 Roberto Mier Escandón <rmescandon@gmail.com>
+# Copyright (C) 2018 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
@@ -17,21 +17,20 @@
 PROJECT := yq
 OWNER := mikefarah
 REPO := github.com
+GOVERSION := 1.15

 export DH_OPTIONS
 export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
-export GOROOT := /usr/local/go
+export GOROOT := /usr/lib/go-${GOVERSION}
 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}

 %:
@@ -43,17 +42,7 @@ 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 ./... \
-	)
-
-	# build man page
-	( \
-		cd ${SRCDIR} && \
-		./scripts/generate-man-page-md.sh && \
-		./scripts/generate-man-page.sh \
-	)
+	(cd ${SRCDIR} && go install -buildmode=pie ./...)
 	
 override_dh_auto_test:
 ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
@@ -65,10 +54,6 @@ 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
@@ -1,2 +1,11 @@
- [cat, dog, frog, cow]
- [apple, banana, grape, mango]
+---
+- become: true
+  gather_facts: false
+  hosts: lalaland
+  name: "Apply smth"
+  roles:
+    - lala
+    - land
+  serial: 1
+- become: false
+  gather_facts: true
@@ -1 +0,0 @@
-bXkgc2VjcmV0IGNoaWxsaSByZWNpcGUgaXMuLi4u
@@ -1,5 +1,5 @@
-volumes:
-  beehive-conf:
-    driver: local
-services:
-  - beehive
+Resources:
+  S3Bucket:
+    Type: AWS::CloudFormation::Stack
+    Properties:
+      BucketName: !Ref MyBucketNameA
@@ -1,5 +1,3 @@
-# --------------------------------------------------
-# It's a test with comment
-# --------------------------------------------------
-groups:
-  - name: d
+#b1 
+b: 2
+#b2
@@ -1,6 +0,0 @@
-# comments on values appear
-person.name = Mike
-
-# comments on array values appear
-person.pets.0 = cat
-person.food.0 = pizza
@@ -1,7 +0,0 @@
-<?xml version="1.0"?>
-<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
-<apple>
-<?coolioo version="1.0"?>
-<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
-<b>things</b>
-</apple>
@@ -1,11 +0,0 @@
-  <?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>
@@ -1,3 +0,0 @@
-name,numberOfCats,likesApples,height
-,1,true,168.8
-Samantha's Rabbit,2,false,-188.8
@@ -1 +0,0 @@
-this.is = a properties file
@@ -1 +0,0 @@
-<this>is some xml</this>
@@ -1,2 +0,0 @@
-a: apple is included
-b: cool.
@@ -1,9 +1,8 @@
-FROM mikefarah/yq:4
+FROM mikefarah/yq:4.13.5

 COPY entrypoint.sh /entrypoint.sh

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

 ENTRYPOINT ["/entrypoint.sh"]
@@ -2,11 +2,8 @@
 set -e
 echo "::debug::\$cmd: $1"
 RESULT=$(eval "$1")
+RESULT="${RESULT//'%'/'%25'}"
+RESULT="${RESULT//$'\n'/'%0A'}"
+RESULT="${RESULT//$'\r'/'%0D'}"
 echo "::debug::\$RESULT: $RESULT"
-# updating from 
-# https://github.com/orgs/community/discussions/26288#discussioncomment-3876281
-# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
-delimiter=$(cat /proc/sys/kernel/random/uuid)
-echo "result<<${delimiter}" >> "${GITHUB_OUTPUT}"
-echo "${RESULT}" >> "${GITHUB_OUTPUT}"
-echo "${delimiter}" >> "${GITHUB_OUTPUT}"
+echo ::set-output name=result::"$RESULT"
@@ -1,31 +1,25 @@
 module github.com/mikefarah/yq/v4

 require (
-	github.com/a8m/envsubst v1.3.0
-	github.com/alecthomas/participle/v2 v2.0.0-beta.5
-	github.com/alecthomas/repr v0.1.1
-	github.com/dimchansky/utfbom v1.1.1
-	github.com/elliotchance/orderedmap v1.5.0
-	github.com/fatih/color v1.13.0
-	github.com/goccy/go-json v0.9.11
-	github.com/goccy/go-yaml v1.9.6
-	github.com/jinzhu/copier v0.3.5
-	github.com/magiconair/properties v1.8.6
-	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
-	github.com/spf13/cobra v1.6.1
-	golang.org/x/net v0.0.0-20220708220712-1185a9018129
+	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
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.1
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )

 require (
-	github.com/inconshreveable/mousetrap v1.0.1 // indirect
-	github.com/mattn/go-colorable v0.1.12 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/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/spf13/pflag v1.0.5 // 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
+	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
 )

-go 1.19
+go 1.17
@@ -1,83 +1,330 @@
-github.com/a8m/envsubst v1.3.0 h1:GmXKmVssap0YtlU3E230W98RWtWCyIZzjtf1apWWyAg=
-github.com/a8m/envsubst v1.3.0/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
-github.com/alecthomas/assert/v2 v2.0.3 h1:WKqJODfOiQG0nEJKFKzDIG3E29CN2/4zR9XGJzKIkbg=
-github.com/alecthomas/participle/v2 v2.0.0-beta.5 h1:y6dsSYVb1G5eK6mgmy+BgI3Mw35a3WghArZ/Hbebrjo=
-github.com/alecthomas/participle/v2 v2.0.0-beta.5/go.mod h1:RC764t6n4L8D8ITAJv0qdokritYSNR3wV5cVwmIEaMM=
-github.com/alecthomas/repr v0.1.1 h1:87P60cSmareLAxMc4Hro0r2RBY4ROm0dYwkJNpS4pPs=
-github.com/alecthomas/repr v0.1.1/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
-github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/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=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
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+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dimchansky/utfbom v1.1.1 h1:vV6w1AhK4VMnhBno/TPVCoK9U/LP0PkLCS9tbxHdi/U=
-github.com/dimchansky/utfbom v1.1.1/go.mod h1:SxdoEBH5qIqFocHMyGOXVAybYJdr71b1Q/j0mACtrfE=
-github.com/elliotchance/orderedmap v1.5.0 h1:1IsExUsjv5XNBD3ZdC7jkAAqLWOOKdbPTmkHx63OsBg=
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 github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
-github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
-github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
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 github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
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+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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+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=
@@ -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, decoder Decoder) error
+	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) 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 {
-	InitExpressionParser()
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
 }

 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 := ExpressionParser.ParseExpression(expression)
+	node, err := e.treeCreator.ParseExpression(expression)
 	if err != nil {
 		return nil, err
 	}
@@ -46,17 +46,22 @@ func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCand
 	return context.MatchingNodes, nil
 }

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

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

-		fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
+		if fileIndex == 0 {
+			firstFileLeadingContent = leadingContent
+		}
+
+		fileDocuments, err := readDocuments(reader, filename, fileIndex)
 		if err != nil {
 			return err
 		}
@@ -66,13 +71,14 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string

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

 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
@@ -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(t, list))
+		test.AssertResultComplex(t, tt.expected, resultsToString(list))
 	}
 }
@@ -3,26 +3,20 @@ 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
-	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
+	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
 	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 propagate to child nodes.
+	// (e.g. top level cross document merge). This property does not propegate to child nodes.
 	EvaluateTogether bool
 	IsMapKey         bool
 }
@@ -35,75 +29,23 @@ func (n *CandidateNode) GetKey() string {
 	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
 }

-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
-	}
+func (n *CandidateNode) CreateChild(path interface{}, node *yaml.Node) *CandidateNode {
 	return &CandidateNode{
 		Node:      node,
-		Path:      n.createChildPath(value),
+		Path:      n.createChildPath(path),
 		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))
@@ -124,29 +66,18 @@ func (n *CandidateNode) Copy() (*CandidateNode, error) {
 	if err != nil {
 		return nil, err
 	}
-	clone.Node = deepClone(n.Node)
 	return clone, nil
 }

 // updates this candidate from the given candidate node
-func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
+func (n *CandidateNode) UpdateFrom(other *CandidateNode) {

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

-func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
+func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 	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
@@ -155,21 +86,12 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 		n.Node.Value = ""
 	}
 	n.Node.Kind = other.Node.Kind
-
-	// don't clobber custom tags...
-	if prefs.ClobberCustomTags || strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
-		n.Node.Tag = other.Node.Tag
-	}
-
+	n.Node.Tag = other.Node.Tag
 	n.Node.Alias = other.Node.Alias
-
-	if !prefs.DontOverWriteAnchor {
-		n.Node.Anchor = other.Node.Anchor
-	}
+	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
 	}
@@ -177,9 +99,6 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	if other.Node.FootComment != "" {
 		n.Node.FootComment = other.Node.FootComment
 	}
-	if other.TrailingContent != "" {
-		n.TrailingContent = other.TrailingContent
-	}
 	if other.Node.HeadComment != "" {
 		n.Node.HeadComment = other.Node.HeadComment
 	}
@@ -1,133 +0,0 @@
-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)
-}
@@ -1,371 +0,0 @@
-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)
-}
@@ -3,7 +3,6 @@ package yqlib
 import (
 	"container/list"
 	"fmt"
-	"time"

 	"github.com/jinzhu/copier"
 	logging "gopkg.in/op/go-logging.v1"
@@ -13,7 +12,6 @@ type Context struct {
 	MatchingNodes  *list.List
 	Variables      map[string]*list.List
 	DontAutoCreate bool
-	datetimeLayout string
 }

 func (n *Context) SingleReadonlyChildContext(candidate *CandidateNode) Context {
@@ -30,17 +28,6 @@ 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
@@ -56,7 +43,7 @@ func (n *Context) SetVariable(name string, value *list.List) {
 }

 func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{DontAutoCreate: n.DontAutoCreate, datetimeLayout: n.datetimeLayout}
+	clone := Context{DontAutoCreate: n.DontAutoCreate}
 	clone.Variables = make(map[string]*list.List)
 	if len(n.Variables) > 0 {
 		err := copier.Copy(&clone.Variables, n.Variables)
@@ -1,282 +0,0 @@
-package yqlib
-
-import (
-	"bufio"
-	"fmt"
-	"testing"
-
-	"github.com/mikefarah/yq/v4/test"
-)
-
-const csvSimple = `name,numberOfCats,likesApples,height
-Gary,1,true,168.8
-Samantha's Rabbit,2,false,-188.8
-`
-const csvMissing = `name,numberOfCats,likesApples,height
-,null,,168.8
-`
-const expectedUpdatedSimpleCsv = `name,numberOfCats,likesApples,height
-Gary,3,true,168.8
-Samantha's Rabbit,2,false,-188.8
-`
-
-const csvSimpleShort = `Name,Number of Cats
-Gary,1
-Samantha's Rabbit,2
-`
-
-const tsvSimple = `name	numberOfCats	likesApples	height
-Gary	1	true	168.8
-Samantha's Rabbit	2	false	-188.8
-`
-
-const expectedYamlFromCSV = `- name: Gary
-  numberOfCats: 1
-  likesApples: true
-  height: 168.8
- name: Samantha's Rabbit
-  numberOfCats: 2
-  likesApples: false
-  height: -188.8
-`
-
-const expectedYamlFromCSVMissingData = `- name: Gary
-  numberOfCats: 1
-  height: 168.8
- name: Samantha's Rabbit
-  height: -188.8
-  likesApples: false
-`
-
-const csvSimpleMissingData = `name,numberOfCats,height
-Gary,1,168.8
-Samantha's Rabbit,,-188.8
-`
-
-const csvTestSimpleYaml = `- [i, like, csv]
- [because, excel, is, cool]`
-
-const expectedSimpleCsv = `i,like,csv
-because,excel,is,cool
-`
-
-const tsvTestExpectedSimpleCsv = `i	like	csv
-because	excel	is	cool
-`
-
-var csvScenarios = []formatScenario{
-	{
-		description:  "Encode CSV simple",
-		input:        csvTestSimpleYaml,
-		expected:     expectedSimpleCsv,
-		scenarioType: "encode-csv",
-	},
-	{
-		description:  "Encode TSV simple",
-		input:        csvTestSimpleYaml,
-		expected:     tsvTestExpectedSimpleCsv,
-		scenarioType: "encode-tsv",
-	},
-	{
-		description:  "Encode Empty",
-		skipDoc:      true,
-		input:        `[]`,
-		expected:     "",
-		scenarioType: "encode-csv",
-	},
-	{
-		description:  "Comma in value",
-		skipDoc:      true,
-		input:        `["comma, in, value", things]`,
-		expected:     "\"comma, in, value\",things\n",
-		scenarioType: "encode-csv",
-	},
-	{
-		description:  "Encode array of objects to csv",
-		input:        expectedYamlFromCSV,
-		expected:     csvSimple,
-		scenarioType: "encode-csv",
-	},
-	{
-		description:    "Encode array of objects to custom csv format",
-		subdescription: "Add the header row manually, then the we convert each object into an array of values - resulting in an array of arrays. Pick the columns and call the header whatever you like.",
-		input:          expectedYamlFromCSV,
-		expected:       csvSimpleShort,
-		expression:     `[["Name", "Number of Cats"]] +  [.[] | [.name, .numberOfCats ]]`,
-		scenarioType:   "encode-csv",
-	},
-	{
-		description:    "Encode array of objects to csv - missing fields behaviour",
-		subdescription: "First entry is used to determine the headers, and it is missing 'likesApples', so it is not included in the csv. Second entry does not have 'numberOfCats' so that is blank",
-		input:          expectedYamlFromCSVMissingData,
-		expected:       csvSimpleMissingData,
-		scenarioType:   "encode-csv",
-	},
-	{
-		description:  "decode csv missing",
-		skipDoc:      true,
-		input:        csvMissing,
-		expected:     csvMissing,
-		scenarioType: "roundtrip-csv",
-	},
-	{
-		description:    "Parse CSV into an array of objects",
-		subdescription: "First row is assumed to be the header row.",
-		input:          csvSimple,
-		expected:       expectedYamlFromCSV,
-		scenarioType:   "decode-csv-object",
-	},
-	{
-		description:    "Parse TSV into an array of objects",
-		subdescription: "First row is assumed to be the header row.",
-		input:          tsvSimple,
-		expected:       expectedYamlFromCSV,
-		scenarioType:   "decode-tsv-object",
-	},
-	{
-		description:  "Round trip",
-		input:        csvSimple,
-		expected:     expectedUpdatedSimpleCsv,
-		expression:   `(.[] | select(.name == "Gary") | .numberOfCats) = 3`,
-		scenarioType: "roundtrip-csv",
-	},
-}
-
-func testCSVScenario(t *testing.T, s formatScenario) {
-	switch s.scenarioType {
-	case "encode-csv":
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(',')), s.description)
-	case "encode-tsv":
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder('\t')), s.description)
-	case "decode-csv-object":
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
-	case "decode-tsv-object":
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder('\t'), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
-	case "roundtrip-csv":
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewCsvEncoder(',')), s.description)
-	default:
-		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
-	}
-}
-
-func documentCSVDecodeObjectScenario(w *bufio.Writer, s formatScenario, formatType string) {
-	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
-
-	if s.subdescription != "" {
-		writeOrPanic(w, s.subdescription)
-		writeOrPanic(w, "\n\n")
-	}
-
-	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
-	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
-
-	writeOrPanic(w, "then\n")
-	writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v sample.%v\n```\n", formatType, formatType))
-	writeOrPanic(w, "will output\n")
-
-	separator := ','
-	if formatType == "tsv" {
-		separator = '\t'
-	}
-
-	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n",
-		processFormatScenario(s, NewCSVObjectDecoder(separator), NewYamlEncoder(s.indent, false, ConfiguredYamlPreferences))),
-	)
-}
-
-func documentCSVEncodeScenario(w *bufio.Writer, s formatScenario, formatType string) {
-	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
-
-	if s.subdescription != "" {
-		writeOrPanic(w, s.subdescription)
-		writeOrPanic(w, "\n\n")
-	}
-
-	writeOrPanic(w, "Given a sample.yml file of:\n")
-	writeOrPanic(w, fmt.Sprintf("```yaml\n%v\n```\n", s.input))
-
-	writeOrPanic(w, "then\n")
-
-	expression := s.expression
-
-	if expression != "" {
-		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v '%v' sample.yml\n```\n", formatType, expression))
-	} else {
-		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v sample.yml\n```\n", formatType))
-	}
-	writeOrPanic(w, "will output\n")
-
-	separator := ','
-	if formatType == "tsv" {
-		separator = '\t'
-	}
-
-	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
-		processFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(separator))),
-	)
-}
-
-func documentCSVRoundTripScenario(w *bufio.Writer, s formatScenario, formatType string) {
-	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
-
-	if s.subdescription != "" {
-		writeOrPanic(w, s.subdescription)
-		writeOrPanic(w, "\n\n")
-	}
-
-	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
-	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
-
-	writeOrPanic(w, "then\n")
-
-	expression := s.expression
-
-	if expression != "" {
-		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v '%v' sample.%v\n```\n", formatType, formatType, expression, formatType))
-	} else {
-		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v sample.%v\n```\n", formatType, formatType, formatType))
-	}
-	writeOrPanic(w, "will output\n")
-
-	separator := ','
-	if formatType == "tsv" {
-		separator = '\t'
-	}
-
-	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
-		processFormatScenario(s, NewCSVObjectDecoder(separator), NewCsvEncoder(separator))),
-	)
-}
-
-func documentCSVScenario(t *testing.T, w *bufio.Writer, i interface{}) {
-	s := i.(formatScenario)
-	if s.skipDoc {
-		return
-	}
-	switch s.scenarioType {
-	case "encode-csv":
-		documentCSVEncodeScenario(w, s, "csv")
-	case "encode-tsv":
-		documentCSVEncodeScenario(w, s, "tsv")
-	case "decode-csv-object":
-		documentCSVDecodeObjectScenario(w, s, "csv")
-	case "decode-tsv-object":
-		documentCSVDecodeObjectScenario(w, s, "tsv")
-	case "roundtrip-csv":
-		documentCSVRoundTripScenario(w, s, "csv")
-
-	default:
-		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
-	}
-}
-
-func TestCSVScenarios(t *testing.T) {
-	for _, tt := range csvScenarios {
-		testCSVScenario(t, tt)
-	}
-	genericScenarios := make([]interface{}, len(csvScenarios))
-	for i, s := range csvScenarios {
-		genericScenarios[i] = s
-	}
-	documentScenarios(t, "usage", "csv-tsv", genericScenarios, documentCSVScenario)
-}
@@ -1,42 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"io"
-)
-
-type InputFormat uint
-
-const (
-	YamlInputFormat = 1 << iota
-	XMLInputFormat
-	PropertiesInputFormat
-	Base64InputFormat
-	JsonInputFormat
-	CSVObjectInputFormat
-	TSVObjectInputFormat
-)
-
-type Decoder interface {
-	Init(reader io.Reader) error
-	Decode() (*CandidateNode, error)
-}
-
-func InputFormatFromString(format string) (InputFormat, error) {
-	switch format {
-	case "yaml", "y":
-		return YamlInputFormat, nil
-	case "xml", "x":
-		return XMLInputFormat, nil
-	case "props", "p":
-		return PropertiesInputFormat, nil
-	case "json", "ndjson", "j":
-		return JsonInputFormat, nil
-	case "csv", "c":
-		return CSVObjectInputFormat, nil
-	case "tsv", "t":
-		return TSVObjectInputFormat, nil
-	default:
-		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml|props]", format)
-	}
-}
@@ -1,57 +0,0 @@
-package yqlib
-
-import (
-	"bytes"
-	"encoding/base64"
-	"io"
-
-	yaml "gopkg.in/yaml.v3"
-)
-
-type base64Decoder struct {
-	reader       io.Reader
-	finished     bool
-	readAnything bool
-	encoding     base64.Encoding
-}
-
-func NewBase64Decoder() Decoder {
-	return &base64Decoder{finished: false, encoding: *base64.StdEncoding}
-}
-
-func (dec *base64Decoder) Init(reader io.Reader) error {
-	dec.reader = reader
-	dec.readAnything = false
-	dec.finished = false
-	return nil
-}
-
-func (dec *base64Decoder) Decode() (*CandidateNode, error) {
-	if dec.finished {
-		return nil, io.EOF
-	}
-	base64Reader := base64.NewDecoder(&dec.encoding, dec.reader)
-	buf := new(bytes.Buffer)
-
-	if _, err := buf.ReadFrom(base64Reader); err != nil {
-		return nil, err
-	}
-	if buf.Len() == 0 {
-		dec.finished = true
-
-		// if we've read _only_ an empty string, lets return that
-		// otherwise if we've already read some bytes, and now we get
-		// an empty string, then we are done.
-		if dec.readAnything {
-			return nil, io.EOF
-		}
-	}
-	dec.readAnything = true
-	return &CandidateNode{
-		Node: &yaml.Node{
-			Kind:  yaml.ScalarNode,
-			Tag:   "!!str",
-			Value: buf.String(),
-		},
-	}, nil
-}
@@ -1,81 +0,0 @@
-package yqlib
-
-import (
-	"encoding/csv"
-	"errors"
-	"io"
-
-	"github.com/dimchansky/utfbom"
-	yaml "gopkg.in/yaml.v3"
-)
-
-type csvObjectDecoder struct {
-	separator rune
-	reader    csv.Reader
-	finished  bool
-}
-
-func NewCSVObjectDecoder(separator rune) Decoder {
-	return &csvObjectDecoder{separator: separator}
-}
-
-func (dec *csvObjectDecoder) Init(reader io.Reader) error {
-	cleanReader, enc := utfbom.Skip(reader)
-	log.Debugf("Detected encoding: %s\n", enc)
-	dec.reader = *csv.NewReader(cleanReader)
-	dec.reader.Comma = dec.separator
-	dec.finished = false
-	return nil
-}
-
-func (dec *csvObjectDecoder) convertToYamlNode(content string) *yaml.Node {
-	node, err := parseSnippet(content)
-	if err != nil {
-		return createScalarNode(content, content)
-	}
-	return node
-}
-
-func (dec *csvObjectDecoder) createObject(headerRow []string, contentRow []string) *yaml.Node {
-	objectNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
-
-	for i, header := range headerRow {
-		objectNode.Content = append(
-			objectNode.Content,
-			createScalarNode(header, header),
-			dec.convertToYamlNode(contentRow[i]))
-	}
-	return objectNode
-}
-
-func (dec *csvObjectDecoder) Decode() (*CandidateNode, error) {
-	if dec.finished {
-		return nil, io.EOF
-	}
-	headerRow, err := dec.reader.Read()
-	log.Debugf(": headerRow%v", headerRow)
-	if err != nil {
-		return nil, err
-	}
-
-	rootArray := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
-
-	contentRow, err := dec.reader.Read()
-
-	for err == nil && len(contentRow) > 0 {
-		log.Debugf("Adding contentRow: %v", contentRow)
-		rootArray.Content = append(rootArray.Content, dec.createObject(headerRow, contentRow))
-		contentRow, err = dec.reader.Read()
-		log.Debugf("Read next contentRow: %v, %v", contentRow, err)
-	}
-	if !errors.Is(err, io.EOF) {
-		return nil, err
-	}
-
-	return &CandidateNode{
-		Node: &yaml.Node{
-			Kind:    yaml.DocumentNode,
-			Content: []*yaml.Node{rootArray},
-		},
-	}, nil
-}
@@ -1,87 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"io"
-
-	"github.com/goccy/go-json"
-	yaml "gopkg.in/yaml.v3"
-)
-
-type jsonDecoder struct {
-	decoder json.Decoder
-}
-
-func NewJSONDecoder() Decoder {
-	return &jsonDecoder{}
-}
-
-func (dec *jsonDecoder) Init(reader io.Reader) error {
-	dec.decoder = *json.NewDecoder(reader)
-	return nil
-}
-
-func (dec *jsonDecoder) Decode() (*CandidateNode, error) {
-
-	var dataBucket orderedMap
-	log.Debug("going to decode")
-	err := dec.decoder.Decode(&dataBucket)
-	if err != nil {
-		return nil, err
-	}
-	node, err := dec.convertToYamlNode(&dataBucket)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &CandidateNode{
-		Node: &yaml.Node{
-			Kind:    yaml.DocumentNode,
-			Content: []*yaml.Node{node},
-		},
-	}, nil
-}
-
-func (dec *jsonDecoder) convertToYamlNode(data *orderedMap) (*yaml.Node, error) {
-	if data.kv == nil {
-		switch rawData := data.altVal.(type) {
-		case nil:
-			return createScalarNode(nil, "null"), nil
-		case float64, float32:
-			// json decoder returns ints as float.
-			return parseSnippet(fmt.Sprintf("%v", rawData))
-		case int, int64, int32, string, bool:
-			return createScalarNode(rawData, fmt.Sprintf("%v", rawData)), nil
-		case []*orderedMap:
-			return dec.parseArray(rawData)
-		default:
-			return nil, fmt.Errorf("unrecognised type :( %v", rawData)
-		}
-	}
-
-	var yamlMap = &yaml.Node{Kind: yaml.MappingNode}
-	for _, keyValuePair := range data.kv {
-		yamlValue, err := dec.convertToYamlNode(&keyValuePair.V)
-		if err != nil {
-			return nil, err
-		}
-		yamlMap.Content = append(yamlMap.Content, createScalarNode(keyValuePair.K, keyValuePair.K), yamlValue)
-	}
-	return yamlMap, nil
-
-}
-
-func (dec *jsonDecoder) parseArray(dataArray []*orderedMap) (*yaml.Node, error) {
-
-	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode}
-
-	for _, value := range dataArray {
-		yamlValue, err := dec.convertToYamlNode(value)
-		if err != nil {
-			return nil, err
-		}
-		yamlMap.Content = append(yamlMap.Content, yamlValue)
-	}
-	return yamlMap, nil
-}
@@ -1,161 +0,0 @@
-package yqlib
-
-import (
-	"bytes"
-	"fmt"
-	"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) error {
-	dec.reader = reader
-	dec.finished = false
-	return nil
-}
-
-func parsePropKey(key string) []interface{} {
-	pathStrArray := strings.Split(key, ".")
-	path := make([]interface{}, len(pathStrArray))
-	for i, pathStr := range pathStrArray {
-		num, err := strconv.ParseInt(pathStr, 10, 32)
-		if err == nil {
-			path[i] = num
-		} else {
-			path[i] = pathStr
-		}
-	}
-	return path
-}
-
-func (dec *propertiesDecoder) processComment(c string) string {
-	if c == "" {
-		return ""
-	}
-	return "# " + c
-}
-
-func (dec *propertiesDecoder) applyPropertyComments(context Context, path []interface{}, comments []string) error {
-	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
-
-	rhsCandidateNode := &CandidateNode{
-		Path: path,
-		Node: &yaml.Node{
-			Tag:         "!!str",
-			Value:       fmt.Sprintf("%v", path[len(path)-1]),
-			HeadComment: dec.processComment(strings.Join(comments, "\n")),
-			Kind:        yaml.ScalarNode,
-		},
-	}
-
-	rhsCandidateNode.Node.Tag = guessTagFromCustomType(rhsCandidateNode.Node)
-
-	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
-
-	assignmentOpNode := &ExpressionNode{
-		Operation: assignmentOp,
-		LHS:       createTraversalTree(path, traversePreferences{}, true),
-		RHS:       &ExpressionNode{Operation: rhsOp},
-	}
-
-	_, err := dec.d.GetMatchingNodes(context, assignmentOpNode)
-	return err
-}
-
-func (dec *propertiesDecoder) applyProperty(context Context, properties *properties.Properties, key string) error {
-	value, _ := properties.Get(key)
-	path := parsePropKey(key)
-
-	propertyComments := properties.GetComments(key)
-	if len(propertyComments) > 0 {
-		err := dec.applyPropertyComments(context, path, propertyComments)
-		if err != nil {
-			return nil
-		}
-	}
-
-	rhsNode := &yaml.Node{
-		Value: value,
-		Tag:   "!!str",
-		Kind:  yaml.ScalarNode,
-	}
-
-	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() (*CandidateNode, error) {
-	if dec.finished {
-		return nil, io.EOF
-	}
-	buf := new(bytes.Buffer)
-
-	if _, err := buf.ReadFrom(dec.reader); err != nil {
-		return nil, err
-	}
-	if buf.Len() == 0 {
-		dec.finished = true
-		return nil, io.EOF
-	}
-	properties, err := properties.LoadString(buf.String())
-	if err != nil {
-		return nil, err
-	}
-	properties.DisableExpansion = true
-
-	rootMap := &CandidateNode{
-		Node: &yaml.Node{
-			Kind: yaml.MappingNode,
-			Tag:  "!!map",
-		},
-	}
-
-	context := Context{}
-	context = context.SingleChildContext(rootMap)
-
-	for _, key := range properties.Keys() {
-		if err := dec.applyProperty(context, properties, key); err != nil {
-			return nil, err
-		}
-
-	}
-	dec.finished = true
-
-	return &CandidateNode{
-		Node: &yaml.Node{
-			Kind:    yaml.DocumentNode,
-			Content: []*yaml.Node{rootMap.Node},
-		},
-	}, nil
-
-}
@@ -1,60 +0,0 @@
-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(ConfiguredYamlPreferences)
-	}
-
-	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()
-
-}
@@ -1,348 +0,0 @@
-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
-	finished     bool
-	prefs        XmlPreferences
-}
-
-func NewXMLDecoder(prefs XmlPreferences) Decoder {
-	return &xmlDecoder{
-		finished: false,
-		prefs:    prefs,
-	}
-}
-
-func (dec *xmlDecoder) Init(reader io.Reader) error {
-	dec.reader = reader
-	dec.readAnything = false
-	dec.finished = false
-	return nil
-}
-
-func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
-	yamlNode := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
-	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, Tag: "!!map"}
-
-	if len(n.Data) > 0 {
-		label := dec.prefs.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)
-
-		}
-
-		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() (*CandidateNode, error) {
-	if dec.finished {
-		return nil, io.EOF
-	}
-	root := &xmlNode{}
-	// cant use xj - it doesn't keep map order.
-	err := dec.decodeXML(root)
-
-	if err != nil {
-		return nil, err
-	}
-	firstNode, err := dec.convertToYamlNode(root)
-
-	if err != nil {
-		return nil, err
-	} else if firstNode.Tag == "!!null" {
-		dec.finished = true
-		if dec.readAnything {
-			return nil, io.EOF
-		}
-	}
-	dec.readAnything = true
-	dec.finished = true
-
-	return &CandidateNode{
-		Node: &yaml.Node{
-			Kind:    yaml.DocumentNode,
-			Content: []*yaml.Node{firstNode},
-		},
-	}, 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.prefs.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.prefs.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.prefs.KeepNamespace {
-					if a.Name.Space != "" {
-						a.Name.Local = a.Name.Space + ":" + a.Name.Local
-					}
-				}
-				elem.n.AddChild(dec.prefs.AttributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
-			}
-		case xml.CharData:
-			// Extract XML data (if any)
-			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})
-			}
-
-		case xml.ProcInst:
-			if !dec.prefs.SkipProcInst {
-				elem.n.AddChild(dec.prefs.ProcInstPrefix+se.Target, &xmlNode{Data: string(se.Inst)})
-			}
-		case xml.Directive:
-			if !dec.prefs.SkipDirectives {
-				elem.n.AddChild(dec.prefs.DirectiveName, &xmlNode{Data: string(se)})
-			}
-		}
-	}
-
-	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])
-}
@@ -1,114 +0,0 @@
-package yqlib
-
-import (
-	"bufio"
-	"errors"
-	"io"
-	"regexp"
-	"strings"
-
-	yaml "gopkg.in/yaml.v3"
-)
-
-type yamlDecoder struct {
-	decoder yaml.Decoder
-	// work around of various parsing issues by yaml.v3 with document headers
-	prefs          YamlPreferences
-	leadingContent string
-	readAnything   bool
-	firstFile      bool
-}
-
-func NewYamlDecoder(prefs YamlPreferences) Decoder {
-	return &yamlDecoder{prefs: prefs, firstFile: true}
-}
-
-func (dec *yamlDecoder) processReadStream(reader *bufio.Reader) (io.Reader, string, error) {
-	var commentLineRegEx = regexp.MustCompile(`^\s*#`)
-	var sb strings.Builder
-	for {
-		peekBytes, err := reader.Peek(3)
-		if errors.Is(err, io.EOF) {
-			// EOF are handled else where..
-			return reader, sb.String(), nil
-		} else if err != nil {
-			return reader, sb.String(), err
-		} else if string(peekBytes) == "---" {
-			_, err := reader.ReadString('\n')
-			sb.WriteString("$yqDocSeperator$\n")
-			if errors.Is(err, io.EOF) {
-				return reader, sb.String(), nil
-			} else if err != nil {
-				return reader, sb.String(), err
-			}
-		} else if commentLineRegEx.MatchString(string(peekBytes)) {
-			line, err := reader.ReadString('\n')
-			sb.WriteString(line)
-			if errors.Is(err, io.EOF) {
-				return reader, sb.String(), nil
-			} else if err != nil {
-				return reader, sb.String(), err
-			}
-		} else {
-			return reader, sb.String(), nil
-		}
-	}
-}
-
-func (dec *yamlDecoder) Init(reader io.Reader) error {
-	readerToUse := reader
-	leadingContent := ""
-	var err error
-	// if we 'evaluating together' - we only process the leading content
-	// of the first file - this ensures comments from subsequent files are
-	// merged together correctly.
-	if dec.prefs.LeadingContentPreProcessing && (!dec.prefs.EvaluateTogether || dec.firstFile) {
-		readerToUse, leadingContent, err = dec.processReadStream(bufio.NewReader(reader))
-		if err != nil {
-			return err
-		}
-	}
-	dec.leadingContent = leadingContent
-	dec.readAnything = false
-	dec.decoder = *yaml.NewDecoder(readerToUse)
-	dec.firstFile = false
-	return nil
-}
-
-func (dec *yamlDecoder) Decode() (*CandidateNode, error) {
-	var dataBucket yaml.Node
-
-	err := dec.decoder.Decode(&dataBucket)
-	if errors.Is(err, io.EOF) && dec.leadingContent != "" && !dec.readAnything {
-		// force returning an empty node with a comment.
-		dec.readAnything = true
-		return dec.blankNodeWithComment(), nil
-
-	} else if err != nil {
-		return nil, err
-	}
-
-	candidateNode := &CandidateNode{
-		Node: &dataBucket,
-	}
-
-	if dec.leadingContent != "" {
-		candidateNode.LeadingContent = dec.leadingContent
-		dec.leadingContent = ""
-	}
-	// move document comments into candidate node
-	// otherwise unwrap drops them.
-	candidateNode.TrailingContent = dataBucket.FootComment
-	dataBucket.FootComment = ""
-	return candidateNode, nil
-}
-
-func (dec *yamlDecoder) blankNodeWithComment() *CandidateNode {
-	return &CandidateNode{
-		Document:       0,
-		Filename:       "",
-		Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
-		FileIndex:      0,
-		LeadingContent: dec.leadingContent,
-	}
-}
@@ -0,0 +1,265 @@
+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
+```
+
@@ -1,5 +1,3 @@
-# Alternative (Default value)
-
 This operator is used to provide alternative (or default) values when a particular expression is either null or false.

 ## LHS is defined
@@ -9,7 +7,7 @@ a: bridge
 ```
 then
 ```bash
-yq '.a // "hello"' sample.yml
+yq eval '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +21,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.a // "hello"' sample.yml
+yq eval '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +35,7 @@ a: ~
 ```
 then
 ```bash
-yq '.a // "hello"' sample.yml
+yq eval '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +49,7 @@ a: false
 ```
 then
 ```bash
-yq '.a // "hello"' sample.yml
+yq eval '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -66,43 +64,10 @@ b: cat
 ```
 then
 ```bash
-yq '.a // .b' sample.yml
+yq eval '.a // .b' sample.yml
 ```
 will output
 ```yaml
 cat
 ```

-## Update or create - entity exists
-This initialises `a` if it's not present
-
-Given a sample.yml file of:
-```yaml
-a: 1
-```
-then
-```bash
-yq '(.a // (.a = 0)) += 1' sample.yml
-```
-will output
-```yaml
-a: 2
-```
-
-## Update or create - entity does not exist
-This initialises `a` if it's not present
-
-Given a sample.yml file of:
-```yaml
-b: camel
-```
-then
-```bash
-yq '(.a // (.a = 0)) += 1' sample.yml
-```
-will output
-```yaml
-b: camel
-a: 1
-```
-
@@ -1,5 +1,3 @@
-# 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.
@@ -25,7 +23,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[4] | explode(.)' sample.yml
+yq eval '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -55,7 +53,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[4] | explode(.)' sample.yml
+yq eval '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +85,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[4] | explode(.)' sample.yml
+yq eval '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -103,7 +101,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq '.a | anchor' sample.yml
+yq eval '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -117,7 +115,7 @@ a: cat
 ```
 then
 ```bash
-yq '.a anchor = "foobar"' sample.yml
+yq eval '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +130,7 @@ a:
 ```
 then
 ```bash
-yq '.a anchor |= .b' sample.yml
+yq eval '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +146,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq '.a | alias' sample.yml
+yq eval '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +161,7 @@ a: cat
 ```
 then
 ```bash
-yq '.a alias = "meow"' sample.yml
+yq eval '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -179,7 +177,7 @@ a: cat
 ```
 then
 ```bash
-yq '.a alias = ""' sample.yml
+yq eval '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -196,7 +194,7 @@ a:
 ```
 then
 ```bash
-yq '.a alias |= .f' sample.yml
+yq eval '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -213,7 +211,7 @@ f:
 ```
 then
 ```bash
-yq 'explode(.f)' sample.yml
+yq eval 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +227,7 @@ a: mike
 ```
 then
 ```bash
-yq 'explode(.a)' sample.yml
+yq eval 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +243,7 @@ f:
 ```
 then
 ```bash
-yq 'explode(.f)' sample.yml
+yq eval 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -278,7 +276,7 @@ foobar:
 ```
 then
 ```bash
-yq 'explode(.)' sample.yml
+yq eval 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -317,7 +315,7 @@ thingTwo:
 ```
 then
 ```bash
-yq '.thingOne |= explode(.) * {"value": false}' sample.yml
+yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
 ```
 will output
 ```yaml
@@ -1,21 +1,8 @@
-# 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.
-
-
-### Flags
- `c` clobber custom tags

 ## Create yaml file
 Running
 ```bash
-yq --null-input '.a.b = "cat" | .x = "frog"'
+yq eval --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -33,7 +20,7 @@ a:
 ```
 then
 ```bash
-yq '.a |= .b' sample.yml
+yq eval '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -50,7 +37,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] |= . * 2' sample.yml
+yq eval '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -89,7 +76,7 @@ b: sibling
 ```
 then
 ```bash
-yq '.a = .b' sample.yml
+yq eval '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -106,13 +93,13 @@ c: fieldC
 ```
 then
 ```bash
-yq '(.a, .c) = "potato"' sample.yml
+yq eval '(.a, .c) = "potatoe"' sample.yml
 ```
 will output
 ```yaml
-a: potato
+a: potatoe
 b: fieldB
-c: potato
+c: potatoe
 ```

 ## Update string value
@@ -123,7 +110,7 @@ a:
 ```
 then
 ```bash
-yq '.a.b = "frog"' sample.yml
+yq eval '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -141,7 +128,7 @@ a:
 ```
 then
 ```bash
-yq '.a.b |= "frog"' sample.yml
+yq eval '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -150,7 +137,7 @@ a:
 ```

 ## 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.
+Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.

 Given a sample.yml file of:
 ```yaml
@@ -160,7 +147,7 @@ a:
 ```
 then
 ```bash
-yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -178,7 +165,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -194,28 +181,11 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.a.b |= "bogs"' sample.yml
+yq eval '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-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
+{a: {b: bogs}}
 ```

 ## Update empty object and array
@@ -225,46 +195,10 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.a.b.[0] |= "bogs"' sample.yml
+yq eval '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-a:
-  b:
-    - bogs
-```
-
-## Custom types are maintained by default
-Given a sample.yml file of:
-```yaml
-a: !cat meow
-b: !dog woof
-```
-then
-```bash
-yq '.a = .b' sample.yml
-```
-will output
-```yaml
-a: !cat woof
-b: !dog woof
-```
-
-## Custom types: clovver
-Use the `c` option to clobber custom tags
-
-Given a sample.yml file of:
-```yaml
-a: !cat meow
-b: !dog woof
-```
-then
-```bash
-yq '.a =c .b' sample.yml
-```
-will output
-```yaml
-a: !dog woof
-b: !dog woof
+{a: {b: [bogs]}}
 ```

@@ -1,5 +1,3 @@
-# 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. 
@@ -10,16 +8,10 @@ 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)
-
 ## `or` example
 Running
 ```bash
-yq --null-input 'true or false'
+yq eval --null-input 'true or false'
 ```
 will output
 ```yaml
@@ -29,7 +21,7 @@ true
 ## `and` example
 Running
 ```bash
-yq --null-input 'true and false'
+yq eval --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -48,7 +40,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
 ```
 will output
 ```yaml
@@ -66,7 +58,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'any' sample.yml
+yq eval 'any' sample.yml
 ```
 will output
 ```yaml
@@ -80,7 +72,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'any' sample.yml
+yq eval 'any' sample.yml
 ```
 will output
 ```yaml
@@ -99,7 +91,7 @@ b:
 ```
 then
 ```bash
-yq '.[] |= any_c(. == "awesome")' sample.yml
+yq eval '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -115,7 +107,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'all' sample.yml
+yq eval 'all' sample.yml
 ```
 will output
 ```yaml
@@ -129,7 +121,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'all' sample.yml
+yq eval 'all' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +140,7 @@ b:
 ```
 then
 ```bash
-yq '.[] |= all_c(tag == "!!str")' sample.yml
+yq eval '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -159,7 +151,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq --null-input 'true | not'
+yq eval --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -169,7 +161,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq --null-input 'false | not'
+yq eval --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -179,7 +171,7 @@ true
 ## String values considered to be true
 Running
 ```bash
-yq --null-input '"cat" | not'
+yq eval --null-input '"cat" | not'
 ```
 will output
 ```yaml
@@ -189,7 +181,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq --null-input '"" | not'
+yq eval --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -199,7 +191,7 @@ false
 ## Numbers are considered to be true
 Running
 ```bash
-yq --null-input '1 | not'
+yq eval --null-input '1 | not'
 ```
 will output
 ```yaml
@@ -209,7 +201,7 @@ false
 ## Zero is considered to be true
 Running
 ```bash
-yq --null-input '0 | not'
+yq eval --null-input '0 | not'
 ```
 will output
 ```yaml
@@ -219,7 +211,7 @@ false
 ## Null is considered to be false
 Running
 ```bash
-yq --null-input '~ | not'
+yq eval --null-input '~ | not'
 ```
 will output
 ```yaml
@@ -6,7 +6,7 @@ This creates an array using the expression between the square brackets.
 ## Collect empty
 Running
 ```bash
-yq --null-input '[]'
+yq eval --null-input '[]'
 ```
 will output
 ```yaml
@@ -16,7 +16,7 @@ will output
 ## Collect single
 Running
 ```bash
-yq --null-input '["cat"]'
+yq eval --null-input '["cat"]'
 ```
 will output
 ```yaml
@@ -31,7 +31,7 @@ b: dog
 ```
 then
 ```bash
-yq '[.a, .b]' sample.yml
+yq eval '[.a, .b]' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,151 @@
+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.
+
+
+## Set line comment
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a lineComment="single"' sample.yml
+```
+will output
+```yaml
+a: cat # single
+```
+
+## Use update assign to perform relative updates
+Given a sample.yml file of:
+```yaml
+a: cat
+b: dog
+```
+then
+```bash
+yq eval '.. lineComment |= .' sample.yml
+```
+will output
+```yaml
+a: cat # cat
+b: dog # dog
+```
+
+## Set head comment
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '. headComment="single"' sample.yml
+```
+will output
+```yaml
+# single
+
+a: cat
+```
+
+## Set foot comment, using an expression
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '. footComment=.a' sample.yml
+```
+will output
+```yaml
+a: cat
+
+# cat
+```
+
+## Remove comment
+Given a sample.yml file of:
+```yaml
+a: cat # comment
+b: dog # leave this
+```
+then
+```bash
+yq eval '.a lineComment=""' sample.yml
+```
+will output
+```yaml
+a: cat
+b: dog # leave this
+```
+
+## Remove (strip) all comments
+Note the use of `...` to ensure key nodes are included.
+
+Given a sample.yml file of:
+```yaml
+a: cat # comment
+# great
+b: # key comment
+```
+then
+```bash
+yq eval '... comments=""' sample.yml
+```
+will output
+```yaml
+a: cat
+b:
+```
+
+## Get line comment
+Given a sample.yml file of:
+```yaml
+a: cat # meow
+```
+then
+```bash
+yq eval '.a | lineComment' sample.yml
+```
+will output
+```yaml
+meow
+```
+
+## Get head comment
+Given a sample.yml file of:
+```yaml
+a: cat # meow
+```
+then
+```bash
+yq eval '. | headComment' sample.yml
+```
+will output
+```yaml
+
+```
+
+## Get foot comment
+Given a sample.yml file of:
+```yaml
+a: cat # meow
+```
+then
+```bash
+yq eval '. | footComment' sample.yml
+```
+will output
+```yaml
+
+```
+
@@ -1,6 +1,3 @@
-# Contains
-
-This returns `true` if the context contains the passed in parameter, and false otherwise.

 ## Array contains array
 Array is equal or subset of
@@ -13,7 +10,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'contains(["baz", "bar"])' sample.yml
+yq eval 'contains(["baz", "bar"])' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +29,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'contains({"bar": [{"barp": 12}]})' sample.yml
+yq eval 'contains({"bar": [{"barp": 12}]})' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +48,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
+yq eval 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
 ```
 will output
 ```yaml
@@ -65,7 +62,7 @@ foobar
 ```
 then
 ```bash
-yq 'contains("bar")' sample.yml
+yq eval 'contains("bar")' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +76,7 @@ meow
 ```
 then
 ```bash
-yq 'contains("meow")' sample.yml
+yq eval 'contains("meow")' sample.yml
 ```
 will output
 ```yaml
@@ -1,11 +1,8 @@
-# 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.
-
 ## Collect empty object
 Running
 ```bash
-yq --null-input '{}'
+yq eval --null-input '{}'
 ```
 will output
 ```yaml
@@ -19,7 +16,7 @@ name: Mike
 ```
 then
 ```bash
-yq '{"wrap": .}' sample.yml
+yq eval '{"wrap": .}' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +34,7 @@ pets:
 ```
 then
 ```bash
-yq '{.name: .pets.[]}' sample.yml
+yq eval '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +57,7 @@ pets:
 ```
 then
 ```bash
-yq '{.name: .pets.[]}' sample.yml
+yq eval '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -73,23 +70,10 @@ Rosey: sheep
 ## Creating yaml from scratch
 Running
 ```bash
-yq --null-input '{"wrap": "frog"}'
+yq eval --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
-```
-
@@ -1,7 +1,4 @@
-# Delete
-
 Deletes matching entries in maps or arrays.
-
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml
@@ -10,7 +7,7 @@ b: dog
 ```
 then
 ```bash
-yq 'del(.b)' sample.yml
+yq eval 'del(.b)' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +23,7 @@ a:
 ```
 then
 ```bash
-yq 'del(.a.a1)' sample.yml
+yq eval 'del(.a.a1)' sample.yml
 ```
 will output
 ```yaml
@@ -43,7 +40,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'del(.[1])' sample.yml
+yq eval 'del(.[1])' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +56,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'del(.[0].a)' sample.yml
+yq eval 'del(.[0].a)' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +71,7 @@ b: dog
 ```
 then
 ```bash
-yq 'del(.c)' sample.yml
+yq eval 'del(.c)' sample.yml
 ```
 will output
 ```yaml
@@ -91,7 +88,7 @@ c: bat
 ```
 then
 ```bash
-yq 'del( .[] | select(. == "*at") )' sample.yml
+yq eval 'del( .[] | select(. == "*at") )' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +106,7 @@ a:
 ```
 then
 ```bash
-yq 'del(.. | select(has("name")).name)' sample.yml
+yq eval 'del(.. | select(has("name")).name)' sample.yml
 ```
 will output
 ```yaml
@@ -1,7 +1,4 @@
-# Document Index
-
 Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
-
 ## Retrieve a document index
 Given a sample.yml file of:
 ```yaml
@@ -11,7 +8,7 @@ a: frog
 ```
 then
 ```bash
-yq '.a | document_index' sample.yml
+yq eval '.a | documentIndex' sample.yml
 ```
 will output
 ```yaml
@@ -29,7 +26,7 @@ a: frog
 ```
 then
 ```bash
-yq '.a | di' sample.yml
+yq eval '.a | di' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +44,7 @@ a: frog
 ```
 then
 ```bash
-yq 'select(document_index == 1)' sample.yml
+yq eval 'select(documentIndex == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -63,7 +60,7 @@ a: frog
 ```
 then
 ```bash
-yq 'select(di == 1)' sample.yml
+yq eval 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +76,7 @@ a: frog
 ```
 then
 ```bash
-yq '.a | ({"match": ., "doc": document_index})' sample.yml
+yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,177 @@
+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 embeded yaml/json/props in them.
+## Encode value as yaml string
+Indent defaults to 2
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    bob: dylan
+```
+then
+```bash
+yq eval '.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 eval '.b = (.a | to_yaml(8))' sample.yml
+```
+will output
+```yaml
+a:
+  cool:
+    bob: dylan
+b: |
+  cool:
+          bob: dylan
+```
+
+## Encode value as yaml string, using toyaml
+Does the same thing as to_yaml, matching jq naming convention.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq eval '.b = (.a | to_yaml)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: |
+  cool: thing
+```
+
+## Encode value as json string
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq eval '.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 eval '.b = (.a | to_json(0))' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: '{"cool":"thing"}'
+```
+
+## Encode value as props string
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq eval '.b = (.a | to_props)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: |
+  cool = thing
+```
+
+## Decode a yaml encoded string
+Given a sample.yml file of:
+```yaml
+a: 'foo: bar'
+```
+then
+```bash
+yq eval '.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 eval '.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 eval '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+```
+will output
+```yaml
+a: 'foo: cat'
+```
+
@@ -1,7 +1,4 @@
-# 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.
-
 ## to_entries Map
 Given a sample.yml file of:
 ```yaml
@@ -10,7 +7,7 @@ b: 2
 ```
 then
 ```bash
-yq 'to_entries' sample.yml
+yq eval 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -28,7 +25,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'to_entries' sample.yml
+yq eval 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +42,7 @@ null
 ```
 then
 ```bash
-yq 'to_entries' sample.yml
+yq eval 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +56,7 @@ b: 2
 ```
 then
 ```bash
-yq 'to_entries | from_entries' sample.yml
+yq eval 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -77,7 +74,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'to_entries | from_entries' sample.yml
+yq eval 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +90,7 @@ b: 2
 ```
 then
 ```bash
-yq 'with_entries(.key |= "KEY_" + .)' sample.yml
+yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
 ```
 will output
 ```yaml
@@ -101,26 +98,6 @@ KEY_a: 1
 KEY_b: 2
 ```

-## Custom sort map keys
-Use to_entries to convert to an array of key/value pairs, sort the array using sort/sort_by/etc, and convert it back.
-
-Given a sample.yml file of:
-```yaml
-a: 1
-c: 3
-b: 2
-```
-then
-```bash
-yq 'to_entries | sort_by(.key) | reverse | from_entries' sample.yml
-```
-will output
-```yaml
-c: 3
-b: 2
-a: 1
-```
-
 ## Use with_entries to filter the map
 Given a sample.yml file of:
 ```yaml
@@ -131,7 +108,7 @@ c:
 ```
 then
 ```bash
-yq 'with_entries(select(.value | has("b")))' sample.yml
+yq eval 'with_entries(select(.value | has("b")))' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,78 @@
+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
+```
+
@@ -1,6 +1,4 @@
-# Equals / Not Equals
-
-This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
+This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.

 ```
 .a == .b
@@ -12,14 +10,6 @@ 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)
-

 ## Match string
 Given a sample.yml file of:
@@ -30,7 +20,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | (. == "*at")' sample.yml
+yq eval '.[] | (. == "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -48,7 +38,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | (. != "*at")' sample.yml
+yq eval '.[] | (. != "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -66,7 +56,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | (. == 4)' sample.yml
+yq eval '.[] | (. == 4)' sample.yml
 ```
 will output
 ```yaml
@@ -75,7 +65,7 @@ true
 false
 ```

-## Don't match number
+## Dont match number
 Given a sample.yml file of:
 ```yaml
 - 3
@@ -84,7 +74,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | (. != 4)' sample.yml
+yq eval '.[] | (. != 4)' sample.yml
 ```
 will output
 ```yaml
@@ -96,35 +86,35 @@ true
 ## Match nulls
 Running
 ```bash
-yq --null-input 'null == ~'
+yq eval --null-input 'null == ~'
 ```
 will output
 ```yaml
 true
 ```

-## Non existent key doesn't equal a value
+## Non exisitant key doesn't equal a value
 Given a sample.yml file of:
 ```yaml
 a: frog
 ```
 then
 ```bash
-yq 'select(.b != "thing")' sample.yml
+yq eval 'select(.b != "thing")' sample.yml
 ```
 will output
 ```yaml
 a: frog
 ```

-## Two non existent keys are equal
+## Two non existant keys are equal
 Given a sample.yml file of:
 ```yaml
 a: frog
 ```
 then
 ```bash
-yq 'select(.b == .c)' sample.yml
+yq eval 'select(.b == .c)' sample.yml
 ```
 will output
 ```yaml
@@ -1,5 +1,3 @@
-# File Operators
-
 File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).

 Note that the `fileIndex` operator has a short alias of `fi`.
@@ -9,7 +7,6 @@ Note the use of eval-all to ensure all documents are loaded into memory.
 ```bash
 yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
-
 ## Get filename
 Given a sample.yml file of:
 ```yaml
@@ -17,7 +14,7 @@ a: cat
 ```
 then
 ```bash
-yq 'filename' sample.yml
+yq eval 'filename' sample.yml
 ```
 will output
 ```yaml
@@ -31,7 +28,7 @@ a: cat
 ```
 then
 ```bash
-yq 'file_index' sample.yml
+yq eval 'fileIndex' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +46,7 @@ a: cat
 ```
 then
 ```bash
-yq eval-all 'file_index' sample.yml another.yml
+yq eval-all 'fileIndex' sample.yml another.yml
 ```
 will output
 ```yaml
@@ -65,7 +62,7 @@ a: cat
 ```
 then
 ```bash
-yq 'fi' sample.yml
+yq eval 'fi' sample.yml
 ```
 will output
 ```yaml
@@ -1,4 +1,3 @@
-# Flatten
 This recursively flattens arrays.

 ## Flatten
@@ -12,7 +11,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'flatten' sample.yml
+yq eval 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -30,7 +29,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'flatten(1)' sample.yml
+yq eval 'flatten(1)' sample.yml
 ```
 will output
 ```yaml
@@ -46,7 +45,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'flatten' sample.yml
+yq eval 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -61,7 +60,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'flatten' sample.yml
+yq eval 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -1,5 +1,3 @@
-# Group By
-
 This is used to group items in an array by an expression.

 ## Group by field
@@ -14,7 +12,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'group_by(.foo)' sample.yml
+yq eval 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +38,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'group_by(.foo)' sample.yml
+yq eval 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml
@@ -1,7 +1,4 @@
-# Has
-
 This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
-
 ## Has map key
 Given a sample.yml file of:
 ```yaml
@@ -12,7 +9,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | has("a")' sample.yml
+yq eval '.[] | has("a")' sample.yml
 ```
 will output
 ```yaml
@@ -36,7 +33,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | select(.a.b | has("c"))' sample.yml
+yq eval '.[] | select(.a.b | has("c"))' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +54,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | has(1)' sample.yml
+yq eval '.[] | has(1)' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,35 @@
+# 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
+```
+
@@ -1,5 +1,3 @@
-# Length
-
 Returns the lengths of the nodes. Length is defined according to the type of the node.

 ## String length
@@ -11,7 +9,7 @@ a: cat
 ```
 then
 ```bash
-yq '.a | length' sample.yml
+yq eval '.a | length' sample.yml
 ```
 will output
 ```yaml
@@ -25,7 +23,7 @@ a: null
 ```
 then
 ```bash
-yq '.a | length' sample.yml
+yq eval '.a | length' sample.yml
 ```
 will output
 ```yaml
@@ -42,7 +40,7 @@ c: dog
 ```
 then
 ```bash
-yq 'length' sample.yml
+yq eval 'length' sample.yml
 ```
 will output
 ```yaml
@@ -61,7 +59,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq 'length' sample.yml
+yq eval 'length' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,366 @@
+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
+```
+
+## Multiply integers
+Running
+```bash
+yq eval --null-input '3 * 4'
+```
+will output
+```yaml
+12
+```
+
+## Merge objects together, returning merged result only
+Given a sample.yml file of:
+```yaml
+a:
+  field: me
+  fieldA: cat
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+then
+```bash
+yq eval '.a * .b' sample.yml
+```
+will output
+```yaml
+field:
+  g: wizz
+fieldA: cat
+fieldB: dog
+```
+
+## Merge objects together, returning parent object
+Given a sample.yml file of:
+```yaml
+a:
+  field: me
+  fieldA: cat
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a:
+  field:
+    g: wizz
+  fieldA: cat
+  fieldB: dog
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+
+## Merge keeps style of LHS
+Given a sample.yml file of:
+```yaml
+a: {things: great}
+b:
+  also: "me"
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a: {things: great, also: "me"}
+b:
+  also: "me"
+```
+
+## Merge arrays
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+  - 3
+b:
+  - 3
+  - 4
+  - 5
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a:
+  - 3
+  - 4
+  - 5
+b:
+  - 3
+  - 4
+  - 5
+```
+
+## Merge, only existing fields
+Given a sample.yml file of:
+```yaml
+a:
+  thing: one
+  cat: frog
+b:
+  missing: two
+  thing: two
+```
+then
+```bash
+yq eval '.a *? .b' sample.yml
+```
+will output
+```yaml
+thing: two
+cat: frog
+```
+
+## Merge, appending arrays
+Given a sample.yml file of:
+```yaml
+a:
+  array:
+    - 1
+    - 2
+    - animal: dog
+  value: coconut
+b:
+  array:
+    - 3
+    - 4
+    - animal: cat
+  value: banana
+```
+then
+```bash
+yq eval '.a *+ .b' sample.yml
+```
+will output
+```yaml
+array:
+  - 1
+  - 2
+  - animal: dog
+  - 3
+  - 4
+  - animal: cat
+value: banana
+```
+
+## Merge, only existing fields, appending arrays
+Given a sample.yml file of:
+```yaml
+a:
+  thing:
+    - 1
+    - 2
+b:
+  thing:
+    - 3
+    - 4
+  another:
+    - 1
+```
+then
+```bash
+yq eval '.a *?+ .b' sample.yml
+```
+will output
+```yaml
+thing:
+  - 1
+  - 2
+  - 3
+  - 4
+```
+
+## Merge, deeply merging arrays
+Merging arrays deeply means arrays are merge like objects, with indexes as their key. In this case, we merge the first item in the array, and do nothing with the second.
+
+Given a sample.yml file of:
+```yaml
+a:
+  - name: fred
+    age: 12
+  - name: bob
+    age: 32
+b:
+  - name: fred
+    age: 34
+```
+then
+```bash
+yq eval '.a *d .b' sample.yml
+```
+will output
+```yaml
+- name: fred
+  age: 34
+- name: bob
+  age: 32
+```
+
+## Merge arrays of objects together, matching on a key
+It's a complex command, the trickyness comes from needing to have the right context in the expressions.
+First we save the second array into a variable '$two' which lets us reference it later.
+We then need to update the first array. We will use the relative update (|=) because we need to update relative to the current element of the array in the LHS in the RHS expression. 
+We set the current element of the first array as $cur. Now we multiply (merge) $cur with the matching entry in $two, by passing $two through a select filter.
+
+
+Given a sample.yml file of:
+```yaml
+- a: apple
+  b: appleB
+- a: kiwi
+  b: kiwiB
+- a: banana
+  b: bananaB
+```
+And another sample another.yml file of:
+```yaml
+- a: banana
+  c: bananaC
+- a: apple
+  b: appleB2
+- a: dingo
+  c: dingoC
+```
+then
+```bash
+yq eval-all '(select(fi==1) | .[]) as $two | select(fi==0) | .[] |= (. as $cur |  $cur * ($two | select(.a == $cur.a)))' sample.yml another.yml
+```
+will output
+```yaml
+- a: apple
+  b: appleB2
+- a: kiwi
+  b: kiwiB
+- a: banana
+  b: bananaB
+  c: bananaC
+```
+
+## Merge to prefix an element
+Given a sample.yml file of:
+```yaml
+a: cat
+b: dog
+```
+then
+```bash
+yq eval '. * {"a": {"c": .a}}' sample.yml
+```
+will output
+```yaml
+a:
+  c: cat
+b: dog
+```
+
+## Merge with simple aliases
+Given a sample.yml file of:
+```yaml
+a: &cat
+  c: frog
+b:
+  f: *cat
+c:
+  g: thongs
+```
+then
+```bash
+yq eval '.c * .b' sample.yml
+```
+will output
+```yaml
+g: thongs
+f: *cat
+```
+
+## Merge copies anchor names
+Given a sample.yml file of:
+```yaml
+a:
+  c: &cat frog
+b:
+  f: *cat
+c:
+  g: thongs
+```
+then
+```bash
+yq eval '.c * .a' sample.yml
+```
+will output
+```yaml
+g: thongs
+c: &cat frog
+```
+
+## Merge with merge anchors
+Given a sample.yml file of:
+```yaml
+foo: &foo
+  a: foo_a
+  thing: foo_thing
+  c: foo_c
+bar: &bar
+  b: bar_b
+  thing: bar_thing
+  c: bar_c
+foobarList:
+  b: foobarList_b
+  !!merge <<:
+    - *foo
+    - *bar
+  c: foobarList_c
+foobar:
+  c: foobar_c
+  !!merge <<: *foo
+  thing: foobar_thing
+```
+then
+```bash
+yq eval '.foobar * .foobarList' sample.yml
+```
+will output
+```yaml
+c: foobarList_c
+!!merge <<:
+  - *foo
+  - *bar
+thing: foobar_thing
+b: foobarList_b
+```
+
@@ -0,0 +1,92 @@
+The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+
+You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.
+
+## Map path
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a.b | path' sample.yml
+```
+will output
+```yaml
+- a
+- b
+```
+
+## Get map key
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a.b | path | .[-1]' sample.yml
+```
+will output
+```yaml
+b
+```
+
+## Array path
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "dog") | path' sample.yml
+```
+will output
+```yaml
+- a
+- 1
+```
+
+## Get array index
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "dog") | path | .[-1]' sample.yml
+```
+will output
+```yaml
+1
+```
+
+## Print path and value
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+  - frog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "*og") | [{"path":path, "value":.}]' sample.yml
+```
+will output
+```yaml
+- path:
+    - a
+    - 1
+  value: dog
+- path:
+    - a
+    - 2
+  value: frog
+```
+
@@ -1,5 +1,3 @@
-# Pipe
-
 Pipe the results of an expression into another. Like the bash operator.

 ## Simple Pipe
@@ -10,7 +8,7 @@ a:
 ```
 then
 ```bash
-yq '.a | .b' sample.yml
+yq eval '.a | .b' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +24,7 @@ c: same
 ```
 then
 ```bash
-yq '.a = "cat" | .b = "dog"' sample.yml
+yq eval '.a = "cat" | .b = "dog"' sample.yml
 ```
 will output
 ```yaml
@@ -1,5 +1,3 @@
-# Recursive Descent (Glob)
-
 This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 

 ## match values form `..`
@@ -8,7 +6,7 @@ This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it
 For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:

 ```bash
-yq '.. style= "flow"' file.yaml
+yq eval '.. style= "flow"' file.yaml
 ```

 ## match values and map keys form `...`
@@ -17,7 +15,7 @@ The also includes map keys in the results set. This is particularly useful in YA
 For instance to set the `style` of all nodes in a yaml doc, including the map keys:

 ```bash
-yq '... style= "flow"' file.yaml
+yq eval '... style= "flow"' file.yaml
 ```
 ## Recurse map (values only)
 Given a sample.yml file of:
@@ -26,7 +24,7 @@ a: frog
 ```
 then
 ```bash
-yq '..' sample.yml
+yq eval '..' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +45,7 @@ a:
 ```
 then
 ```bash
-yq '[.. | select(has("name"))]' sample.yml
+yq eval '[.. | select(has("name"))]' sample.yml
 ```
 will output
 ```yaml
@@ -70,7 +68,7 @@ a:
 ```
 then
 ```bash
-yq '.. | select(. == "frog")' sample.yml
+yq eval '.. | select(. == "frog")' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +85,7 @@ a: frog
 ```
 then
 ```bash
-yq '...' sample.yml
+yq eval '...' sample.yml
 ```
 will output
 ```yaml
@@ -105,7 +103,7 @@ b: *cat
 ```
 then
 ```bash
-yq '[..]' sample.yml
+yq eval '[..]' sample.yml
 ```
 will output
 ```yaml
@@ -142,7 +140,7 @@ foobar:
 ```
 then
 ```bash
-yq '.foobar | [..]' sample.yml
+yq eval '.foobar | [..]' sample.yml
 ```
 will output
 ```yaml
@@ -1,5 +1,3 @@
-# Reduce
-
 Reduce is a powerful way to process a collection of data into a new form.

 ```
@@ -19,7 +17,8 @@ On the RHS there is `<init>`, the starting value of the accumulator and `<block>
 ## yq vs jq syntax
 Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).

-To that end, the reduce operator is called `ireduce` for backwards compatibility if a `jq` like prefix version of `reduce` is ever added.
+To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
+

 ## Sum numbers
 Given a sample.yml file of:
@@ -31,7 +30,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] as $item ireduce (0; . + $item)' sample.yml
+yq eval '.[] as $item ireduce (0; . + $item)' sample.yml
 ```
 will output
 ```yaml
@@ -67,7 +66,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] as $item ireduce ({}; .[$item | .name] = ($item | .has) )' sample.yml
+yq eval '.[] as $item ireduce ({}; .[$item | .name] = ($item | .has) )' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,38 @@
+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
+```
+
@@ -1,20 +1,13 @@
-# Sort Keys
-
 The Sort Keys operator sorts maps by their keys (based on their string value). This operator does not do anything to arrays or scalars (so you can easily recursively apply it to all maps).

 Sort is particularly useful for diffing two different yaml documents:

 ```bash
-yq -i -P 'sort_keys(..)' file1.yml
-yq -i -P 'sort_keys(..)' file2.yml
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
 diff file1.yml file2.yml
 ```

-Note that `yq` does not yet consider anchors when sorting by keys - this may result in invalid yaml documents if your are using merge anchors.
-
-For more advanced sorting, using `to_entries` to convert the map to an array, then sort/process the array as you like (e.g. using `sort_by`) and convert back to a map using `from_entries`.
-See [here](https://mikefarah.gitbook.io/yq/operators/entries#custom-sort-map-keys) for an example. 
-
 ## Sort keys of map
 Given a sample.yml file of:
 ```yaml
@@ -24,7 +17,7 @@ b: bing
 ```
 then
 ```bash
-yq 'sort_keys(.)' sample.yml
+yq eval 'sortKeys(.)' sample.yml
 ```
 will output
 ```yaml
@@ -54,7 +47,7 @@ aParent:
 ```
 then
 ```bash
-yq 'sort_keys(..)' sample.yml
+yq eval 'sortKeys(..)' sample.yml
 ```
 will output
 ```yaml
@@ -5,7 +5,7 @@ This operator splits all matches into separate documents
 ## Split empty
 Running
 ```bash
-yq --null-input 'split_doc'
+yq eval --null-input 'splitDoc'
 ```
 will output
 ```yaml
@@ -20,7 +20,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq '.[] | split_doc' sample.yml
+yq eval '.[] | splitDoc' sample.yml
 ```
 will output
 ```yaml
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mike Farah	8ad8903e21	Split printer!	2021-10-30 09:56:47 +11:00
Mike Farah	3a7fd8f2c4	wip split	2021-10-29 20:53:28 +11:00
Mike Farah	c2d9b98aeb	wip split	2021-10-29 20:49:06 +11:00
Mike Farah	54b20f68db	Wip split printer	2021-10-29 16:07:17 +11:00
Mike Farah	0289128d2a	Wip split printer	2021-10-29 14:14:39 +11:00