tests passsing!

.dockerignore

@@ -1 +1 @@
-bin/*
+bin

.github/FUNDING.yml

@@ -1 +0,0 @@
-github: mikefarah

.github/ISSUE_TEMPLATE/bug_report_v3.md

@@ -10,8 +10,6 @@ assignees: ''
 **Describe the bug**
 A clear and concise description of what the bug is.
 
-Note that any how to questions should be posted in the discussion board and not raised as an issue.
-
 Version of yq: 3.X.X
 Operating system: mac/linux/windows/....
 Installed via: docker/binary release/homebrew/snap/...

.github/ISSUE_TEMPLATE/bug_report_v4.md

@@ -10,8 +10,6 @@ assignees: ''
 **Describe the bug**
 A clear and concise description of what the bug is.
 
-Note that any how to questions should be posted in the discussion board and not raised as an issue.
-
 Version of yq: 4.X.X
 Operating system: mac/linux/windows/....
 Installed via: docker/binary release/homebrew/snap/...

.github/ISSUE_TEMPLATE/feature_request.md

@@ -9,11 +9,9 @@ assignees: ''
 
 **Please describe your feature request.**
 A clear and concise description of what the request is and what it would solve. 
-Eg. I wish I could use yq to [...]
+Ex. I wish I could use yq to [...]
 
-Note:
-- how to questions should be posted in the discussion board and not raised as an issue.
-- V3 will no longer have any enhancements.
+Please note that V3 will no longer have any enhancements.
 
 **Describe the solution you'd like**
 If we have data1.yml like:

.github/dependabot.yml

@@ -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

.github/workflows/go.yml

@@ -1,5 +1,5 @@
 name: Build
-on: [push, pull_request]
+on: [push]
 jobs:
 
   build:
@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.17
-      uses: actions/setup-go@v2
+    - name: Set up Go 1.15
+      uses: actions/setup-go@v1
       with:
-        go-version: 1.17
+        go-version: 1.15
       id: go
 
     - name: Check out code into the Go module directory
@@ -24,8 +24,8 @@ jobs:
             dep ensure
         fi
 
-    - name: Check the build
+    - name: Download deps
       run: |
         export PATH=${PATH}:`go env GOPATH`/bin
         scripts/devtools.sh
-        make local build
+        make local build

.github/workflows/release.yml

@@ -11,42 +11,16 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.17.5'
-      - name: Compile man page markup
-        id: gen-man-page-md
-        run: |
-          ./scripts/generate-man-page-md.sh
-          echo "::set-output name=man-page-md::man.md"
-
-      - name: Get the version
-        id: get_version
-        run: echo ::set-output name=VERSION::${GITHUB_REF##*/}
-
-      - name: Generate man page
-        uses: docker://pandoc/core:2.14.2
-        id: gen-man-page
-        with:
-          args: >-
-            --standalone
-            --to man
-            --variable=title:"YQ"
-            --variable=section:"1"
-            --variable=header:"yq (https://github.com/mikefarah/yq/) version ${{ steps.get_version.outputs.VERSION }}"
-            --variable=author:"Mike Farah"
-            --output=yq.1
-            ${{ steps.gen-man-page-md.outputs.man-page-md }}
-
+          go-version: '^1.15'
       - name: Cross compile
         run: |
           sudo apt-get install rhash -y
           go get github.com/mitchellh/gox
-          mkdir -p build
-          cp yq.1 build/yq.1
           ./scripts/xcompile.sh
 
       - name: Create Release
         id: create_release
-        uses: actions/create-release@v1.1.4
+        uses: actions/create-release@v1.0.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
@@ -66,13 +40,23 @@ jobs:
       IMAGE_NAME: mikefarah/yq
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-
+      - name: Get latest release tag      
+        uses: oprypin/find-latest-tag@v1
+        with:
+          repository: mikefarah/yq  # The repository to scan.
+          releases-only: true  # We know that all relevant tags have a GitHub release for them.
+        id: yq  
+        
+      - name: Clone source code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ steps.yq.outputs.tag }}
+      
       - 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
@@ -81,30 +65,14 @@ jobs:
 
       - 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=${IMAGE_V_VERSION:1}
+          IMAGE_VERSION="$(git describe --tags --abbrev=0)"
+          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 '${{ secrets.DOCKER_USERNAME }}' --password-stdin
-          docker buildx build \
-            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
-            --label "org.opencontainers.image.created=$(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" \
-            .
+          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 .
+    

.github/workflows/test-yq.yml

@@ -1,19 +0,0 @@
-name: Test Yq Action
-on: [push]
-jobs:
-
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Get test
-        uses: mikefarah/yq@master
-        with:
-          cmd: yq eval '.a' examples/sample.yaml
-      - name: Write inplace test
-        id: lookupSdkVersion
-        uses: mikefarah/yq@master
-        with:
-          cmd: yq eval -i '.b.c = 5' examples/sample.yaml

.gitignore

@@ -38,14 +38,3 @@ parts/
 prime/
 .snapcraft/
 yq*.snap
-
-test.yml
-test*.yml
-0.yml
-1.yml
-2.yml
-
-
-# man page
-man.md
-yq.1

.golangci.yml

@@ -1,32 +0,0 @@
-run:
-  timeout: 5m
-linters:
-  enable:
-    - asciicheck
-    - depguard
-    - errorlint
-    - gci
-    - gochecknoinits
-    - gofmt
-    - goimports
-    - gosec
-    - megacheck
-    - misspell
-    - nakedret
-    - nolintlint
-    - predeclared
-    - revive
-    - unconvert
-    - unparam
-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"

Dockerfile

@@ -1,28 +1,25 @@
-FROM golang:1.17 as builder
+FROM golang:1.15 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
-COPY . .
+# cache devtools
+COPY ./scripts/devtools.sh /go/src/mikefarah/yq/scripts/devtools.sh
+RUN ./scripts/devtools.sh
 
-RUN CGO_ENABLED=0 go build .
-# RUN ./scripts/test.sh -- this too often times out in the github pipeline.
-RUN ./scripts/acceptance.sh
+COPY . /go/src/mikefarah/yq
+
+RUN CGO_ENABLED=0 make local build
 
 # 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>"
+FROM alpine:3.12.3 as production
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
+RUN chmod +x /usr/bin/yq
+
+ARG VERSION=none
+LABEL version=${VERSION}
 
 WORKDIR /workdir
 
-RUN set -eux; \
-  addgroup -g 1000 yq; \
-  adduser -u 1000 -G yq -s /bin/sh -h /home/yq -D yq
-
-RUN chown -R yq:yq /workdir
-
-USER yq
-
 ENTRYPOINT ["/usr/bin/yq"]

Dockerfile.dev

@@ -1,10 +1,30 @@
-FROM golang:1.17
+FROM golang:1.15
 
 COPY scripts/devtools.sh /opt/devtools.sh
 
 RUN set -e -x \
     && /opt/devtools.sh
-ENV PATH=/go/bin:$PATH
+
+# install mkdocs
+RUN set -ex \
+    && buildDeps=' \
+        build-essential \
+        python3-dev \
+    ' \
+    && apt-get update && apt-get install -y --no-install-recommends \
+        $buildDeps \
+        python3 \
+        python3-setuptools \
+        python3-wheel \
+        python3-pip \
+    && pip3 install --upgrade \
+        pip \
+        'Markdown>=2.6.9' \
+        'mkdocs>=0.16.3' \
+        'mkdocs-material>=1.10.1' \
+        'markdown-include>=0.5.1' \
+    && apt-get purge -y --auto-remove $buildDeps \
+    && rm -rf /var/lib/apt/lists/*
 
 ENV CGO_ENABLED 0
 ENV GOPATH /go:/yq

Makefile

@@ -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
 
@@ -18,7 +17,6 @@ help:
 	@echo '    make vendor          Install dependencies to vendor directory.'
 	@echo '    make format          Run code formatter.'
 	@echo '    make check           Run static code analysis (lint).'
-	@echo '    make secure          Run gosec.'
 	@echo '    make test            Run tests on project.'
 	@echo '    make cover           Run tests and capture code coverage metrics on project.'
 	@echo '    make clean           Clean the directory tree of produced artifacts.'
@@ -34,7 +32,7 @@ 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 +41,9 @@ 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 +53,58 @@ 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: 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: build-docs
+build-docs: prepare mkdocs.yml mkdocs/*
+	${DOCKRUN} mkdocs build
+	@find docs -type d -exec chmod 755 {} \; || :
+	@find docs -type f -exec chmod 644 {} \; || :
 
 .PHONY: release
 release: xcompile
-	${ENGINERUN} bash ./scripts/publish.sh
+	${DOCKRUN} bash ./scripts/publish.sh
 
 # ----------------------------------------------
 # utilities

Makefile.variables

@@ -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 \

README.md

@@ -3,77 +3,26 @@
 ![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 processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
+a lightweight and portable command-line YAML processor
 
-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.
+The aim of the project is to be the [jq](https://github.com/stedolan/jq) or sed of yaml files.
 
-## Quick Usage Guide
+## V4 released!
+V4 is now officially released, it's quite different from V3 (sorry for the migration), however it is much more similar to ```jq```, using a similar expression syntax and therefore support much more complex functionality! 
 
-Read a value:
-```bash
-yq e '.a.b[0].c' file.yaml
-```
-
-Pipe from STDIN:
-```bash
-cat file.yaml | yq e '.a.b[0].c' -
-```
-
-Update a yaml file, inplace
-```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
-```
-
-Update using environment variables
-```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
-```
-
-Merge multiple files
-```
-yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
-```
-
-Multiple updates to a yaml file
-```bash
-yq e -i '
-  .a.b[0].c = "cool" |
-  .x.y.z = "foobar" |
-  .person.name = strenv(NAME)
-' file.yaml
-```
-
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+If you've been using v3 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/v/v4.x/upgrading-from-v3).
 
 ## Install
 
 ### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)
 
-### wget
-Use wget to download the pre-compiled binaries:
-
-#### Compressed via tar.gz
-```bash
-wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY}.tar.gz -O - |\
-  tar xz && mv ${BINARY} /usr/bin/yq
-```
-
-#### Plain binary
-
-```bash
-wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /usr/bin/yq &&\
-    chmod +x /usr/bin/yq
-```
-
-For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
-
-### MacOS / Linux via Homebrew:
+### MacOS:
 Using [Homebrew](https://brew.sh/)
 ```
 brew install yq
 ```
 
-### Linux via snap:
+### Ubuntu and other Linux distros supporting `snap` packages:
 ```
 snap install yq
 ```
@@ -96,7 +45,18 @@ sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
-### Run with Docker or Podman
+### wget
+
+Use wget to download the pre-compiled binaries:
+
+```bash
+wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /usr/bin/yq &&\
+    chmod +x /usr/bin/yq
+```
+
+For instance, VERSION=4.0.0 and BINARY=yq_linux_amd64
+
+### Run with Docker
 
 #### Oneshot use:
 
@@ -104,30 +64,10 @@ rm /etc/myfile.tmp
 docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
 ```
 
-```bash
-podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
-```
-
-#### Pipe in via STDIN:
-
-You'll need to pass the `-i\--interactive` flag to docker:
-
-```bash
-cat myfile.yml | docker run -i --rm mikefarah/yq e . -
-```
-
-```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq e . -
-```
-
 #### Run commands interactively:
 
 ```bash
-docker run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
-```
-
-```bash
-podman run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
+docker run --rm -it -v "${PWD}":/workdir mikefarah/yq sh
 ```
 
 It can be useful to have a bash function to avoid typing the whole docker command:
@@ -138,66 +78,16 @@ 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:
-
-
-```
-docker run --user="root" -it --entrypoint sh mikefarah/yq
-```
-
-```
-podman run --user="root" -it --entrypoint sh mikefarah/yq
-```
-
-Or, in your Dockerfile:
-
-```
-FROM mikefarah/yq
-
-USER root
-RUN apk add bash
-USER yq
-```
-
-### GitHub Action
-```
-  - name: Set foobar to cool
-    uses: mikefarah/yq@master
-    with:
-      cmd: yq eval -i '.foo.bar = "cool"' 'config.yml'
-```
-
-See https://mikefarah.gitbook.io/yq/usage/github-action for more.
-
 ### Go Get:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v4
+GO111MODULE=on go get github.com/mikefarah/yq
 ```
 
 ## Community Supported Installation methods
 As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.
 
-# Webi
-
-```
-webi yq
-```
-
-See [webi](https://webinstall.dev/)
-Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/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)
 ```
 choco install yq
 ```
@@ -230,25 +120,19 @@ sudo apt install yq -y
 Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 
 ## Features
-- [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
 - Uses similar syntax as `jq` but works with YAML and JSON files
 - Fully supports multi document yaml files
-- Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
 - Colorized yaml output
-- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
-- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
-- 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).
+- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
+- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/v/v4.x/sort-keys)
+- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/comment-operators), [styling](https://mikefarah.gitbook.io/yq/style), [tags](https://mikefarah.gitbook.io/yq/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/anchor-and-alias-operators).
 - [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)
+- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/v/v4.x/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
-- [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
-- [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
-- [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
+- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
 - [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)
 
 ## [Usage](https://mikefarah.gitbook.io/yq/)
 
@@ -260,32 +144,32 @@ Usage:
   yq [command]
 
 Available Commands:
-  eval             Apply the expression to each document in each yaml file in sequence
+  eval             Apply expression to each document in each yaml file given in sequence
   eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
   help             Help about any command
   shell-completion Generate completion script
 
 Flags:
-  -C, --colors                force print with colors
-  -e, --exit-status           set exit status if there are no matches or null or false is returned
-  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
-      --header-preprocess     Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
-  -h, --help                  help for yq
-  -I, --indent int            sets indent level for output (default 2)
-  -i, --inplace               update the yaml file inplace of first yaml file given.
-  -M, --no-colors             force print with no colors
-  -N, --no-doc                Don't print document separators (---)
-  -n, --null-input            Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-  -o, --output-format string  [yaml|y|json|j|props|p] output format type. (default "yaml")
-  -P, --prettyPrint           pretty print, shorthand for '... style = ""'
-      --unwrapScalar          unwrap scalar, print the value with no quotes, colors or comments (default true)
-  -v, --verbose               verbose mode
-  -V, --version               Print version information and quit
+  -C, --colors        force print with colors
+  -e, --exit-status   set exit status if there are no matches or null or false is returned
+  -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.
+  -j, --tojson        output as json. Set indent to 0 to print json in one line.
+  -v, --verbose       verbose mode
+  -V, --version       Print version information and quit
 
 Use "yq [command] --help" for more information about a command.
 ```
+
+Simple Example:
+
+```bash
+yq e '.a.b | length' f1.yml f2.yml 
+```
+
 ## 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)
-
-See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.

acceptance_tests/bad_args.sh

@@ -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

acceptance_tests/basic.sh

@@ -1,72 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-}
-
-testBasicEvalRoundTrip() {
-  ./yq e -n ".a = 123" > test.yml
-  X=$(./yq e '.a' test.yml)
-  assertEquals 123 "$X"
-}
-
-testBasicUpdateInPlaceSequence() {
-  cat >test.yml <<EOL
-a: 0
-EOL
-  ./yq e -i ".a = 10" test.yml
-  X=$(./yq e '.a' test.yml)
-  assertEquals "10" "$X"
-}
-
-testBasicUpdateInPlaceSequenceEvalAll() {
-  cat >test.yml <<EOL
-a: 0
-EOL
-  ./yq ea -i ".a = 10" test.yml
-  X=$(./yq e '.a' test.yml)
-  assertEquals "10" "$X"
-}
-
-testBasicNoExitStatus() {
-  echo "a: cat" > test.yml
-  X=$(./yq e '.z' test.yml)
-  assertEquals "null" "$X"
-}
-
-testBasicExitStatus() {
-  echo "a: cat" > test.yml
-  X=$(./yq e -e '.z' test.yml 2&>/dev/null)
-  assertEquals 1 "$?"
-}
-
-testBasicExtractFieldWithSeperator() {
-    cat >test.yml <<EOL
----
-name: chart-name
-version: 1.2.3
-EOL
-  X=$(./yq e '.name' test.yml)
-  assertEquals "chart-name" "$X"
-}
-
-testBasicExtractMultipleFieldWithSeperator() {
-    cat >test.yml <<EOL
----
-name: chart-name
-version: 1.2.3
----
-name: thing
-version: 1.2.3
-EOL
-
-read -r -d '' expected << EOM
-chart-name
----
-thing
-EOM
-  X=$(./yq e '.name' test.yml)
-  assertEquals "$expected" "$X"
-}
-
-source ./scripts/shunit2

acceptance_tests/empty.sh

@@ -1,83 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-  cat >test.yml <<EOL
-# comment
-EOL
-}
-
-testEmptyEval() {
-  X=$(./yq e test.yml)
-  expected=$(cat test.yml)
-  assertEquals 0 $?
-  assertEquals "$expected" "$X"
-}
-
-testEmptyEvalNoNewLine() {
-  echo -n "#comment" >test.yml
-  X=$(./yq e test.yml)
-  expected=$(cat test.yml)
-  assertEquals 0 $?
-  assertEquals "$expected" "$X"
-}
-
-testEmptyEvalNoNewLineWithExpression() {
-  echo -n "# comment" >test.yml
-  X=$(./yq e '.apple = "tree"' test.yml)
-  read -r -d '' expected << EOM
-# comment
-apple: tree
-EOM
-  assertEquals "$expected" "$X"
-}
-
-testEmptyEvalPipe() {
-  X=$(./yq e - < test.yml)
-  assertEquals 0 $?
-}
-
-testEmptyCommentsWithExpressionEval() {
-  read -r -d '' expected << EOM
-# comment
-apple: tree
-EOM
-
-  X=$(./yq e '.apple="tree"' test.yml)
-
-  assertEquals "$expected" "$X"
-}
-
-testEmptyCommentsWithExpressionEvalAll() {
-  read -r -d '' expected << EOM
-# comment
-apple: tree
-EOM
-
-  X=$(./yq ea '.apple="tree"' test.yml)
-
-  assertEquals "$expected" "$X"
-}
-
-testEmptyWithExpressionEval() {
-  rm test.yml
-  touch test.yml
-  expected="apple: tree"
-
-  X=$(./yq e '.apple="tree"' test.yml)
-
-  assertEquals "$expected" "$X"
-}
-
-testEmptyWithExpressionEvalAll() {
-  rm test.yml
-  touch test.yml
-  expected="apple: tree"
-
-  X=$(./yq ea '.apple="tree"' test.yml)
-
-  assertEquals "$expected" "$X"
-}
-
-
-source ./scripts/shunit2

acceptance_tests/front-matter.sh

@@ -1,76 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-  cat >test.yml <<EOL
----
-a: apple
-b: cat
----
-not yaml
-c: at
-EOL
-}
-
-testFrontMatterProcessEval() {
-  read -r -d '' expected << EOM
----
-a: apple
-b: dog
----
-not yaml
-c: at
-EOM
-  ./yq e --front-matter="process" '.b = "dog"' test.yml -i
-  assertEquals "$expected" "$(cat test.yml)"
-}
-
-testFrontMatterProcessEvalAll() {
-  read -r -d '' expected << EOM
----
-a: apple
-b: dog
----
-not yaml
-c: at
-EOM
-  ./yq ea --front-matter="process" '.b = "dog"' test.yml -i
-  assertEquals "$expected" "$(cat test.yml)"
-}
-
-testFrontMatterExtractEval() {
-    cat >test.yml <<EOL
-a: apple
-b: cat
----
-not yaml
-c: at
-EOL
-
-  read -r -d '' expected << EOM
-a: apple
-b: dog
-EOM
-  ./yq e --front-matter="extract" '.b = "dog"' test.yml -i
-  assertEquals "$expected" "$(cat test.yml)"
-}
-
-testFrontMatterExtractEvalAll() {
-  cat >test.yml <<EOL
-a: apple
-b: cat
----
-not yaml
-c: at
-EOL
-
-  read -r -d '' expected << EOM
-a: apple
-b: dog
-EOM
-  ./yq ea --front-matter="extract" '.b = "dog"' test.yml -i
-  assertEquals "$expected" "$(cat test.yml)"
-}
-
-
-source ./scripts/shunit2

acceptance_tests/leading-seperator.sh

@@ -1,450 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-  cat >test.yml <<EOL
----
-a: test
-EOL
-}
-
-testLeadingSeperatorWithDoc() {
-  cat >test.yml <<EOL
-# hi peeps
-# cool
----
-a: test
----
-b: cool
-EOL
-
-  read -r -d '' expected << EOM
-# hi peeps
-# cool
----
-a: thing
----
-b: cool
-EOM
-
-  X=$(./yq e '(select(di == 0) | .a) = "thing"' - < test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorPipeIntoEvalSeq() {
-  X=$(./yq e - < test.yml)
-  expected=$(cat test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorExtractField() {
-  X=$(./yq e '.a' - < test.yml)
-  assertEquals "test" "$X"
-}
-
-testLeadingSeperatorExtractFieldWithCommentsAfterSep() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
-EOL
-  X=$(./yq e '.a' test.yml)
-  assertEquals "test" "$X"
-}
-
-testLeadingSeperatorExtractFieldWithCommentsBeforeSep() {
-  cat >test.yml <<EOL
-# hi peeps
-# cool
----
-a: test
-EOL
-  X=$(./yq e '.a' test.yml)
-  assertEquals "test" "$X"
-}
-
-
-testLeadingSeperatorExtractFieldMultiDoc() {
-  cat >test.yml <<EOL
----
-a: test
----
-a: test2
-EOL
-
-  read -r -d '' expected << EOM
-test
----
-test2
-EOM
-  X=$(./yq e '.a' test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorExtractFieldMultiDocWithComments() {
-  cat >test.yml <<EOL
-# here
----
-# there
-a: test
-# whereever
----
-# you are
-a: test2
-# woop
-EOL
-
-  read -r -d '' expected << EOM
-test
----
-test2
-EOM
-  X=$(./yq e '.a' test.yml)
-  assertEquals "$expected" "$X"
-}
-
-
-testLeadingSeperatorEvalSeq() {
-  X=$(./yq e test.yml)
-  expected=$(cat test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorPipeIntoEvalAll() {
-  X=$(./yq ea - < test.yml)
-  expected=$(cat test.yml)
-  assertEquals "$expected" "$X"
-}
-
-
-testLeadingSeperatorEvalAll() {
-  X=$(./yq ea test.yml)
-  expected=$(cat test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalSimple() {
-  read -r -d '' expected << EOM
----
-a: test
----
-version: 3
-application: MyApp
-EOM
-
-
-  X=$(./yq e '.' test.yml examples/order.yaml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocInOneFile() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
----
-b: things
-EOL
-  expected=$(cat test.yml)
-  X=$(./yq e '.' test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocInOneFileEvalAll() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
----
-b: things
-EOL
-  expected=$(cat test.yml)
-  X=$(./yq ea '.' test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalComments() {
-  cat >test.yml <<EOL
-# hi peeps
-# cool
-a: test
-EOL
-
-cat >test2.yml <<EOL
-# this is another doc
-# great
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
-# hi peeps
-# cool
-a: test
----
-# this is another doc
-# great
-b: sane
-EOM
-
-
-  X=$(./yq e '.' test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalCommentsTrailingSep() {
-  cat >test.yml <<EOL
-# hi peeps
-# cool
----
-a: test
-EOL
-
-cat >test2.yml <<EOL
-# this is another doc
-# great
----
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
-# hi peeps
-# cool
----
-a: test
----
-# this is another doc
-# great
----
-b: sane
-EOM
-
-
-  X=$(./yq e '.' test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiMultiDocEvalCommentsTrailingSep() {
-  cat >test.yml <<EOL
-# hi peeps
-# cool
----
-a: test
----
-a1: test2
-EOL
-
-cat >test2.yml <<EOL
-# this is another doc
-# great
----
-b: sane
----
-b2: cool
-EOL
-
-  read -r -d '' expected << EOM
-# hi peeps
-# cool
----
-a: test
----
-a1: test2
----
-# this is another doc
-# great
----
-b: sane
----
-b2: cool
-EOM
-
-
-  X=$(./yq e '.' test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalCommentsLeadingSep() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
-EOL
-
-cat >test2.yml <<EOL
----
-# this is another doc
-# great
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
----
-# hi peeps
-# cool
-a: test
----
-# this is another doc
-# great
-b: sane
-EOM
-
-
-  X=$(./yq e '.' test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-# https://github.com/mikefarah/yq/issues/919
-testLeadingSeparatorDoesNotBreakCommentsOnOtherFiles() {
-  cat >test.yml <<EOL
-# a1
-a: 1
-# a2
-EOL
-
-cat >test2.yml <<EOL
-# b1
-b: 2
-# b2
-EOL
-
-  read -r -d '' expected << EOM
-# a1
-a: 1
-# a2
-
-# b1
-b: 2
-# b2
-EOM
-
-
-  X=$(./yq ea 'select(fi == 0) * select(fi == 1)' test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalCommentsStripComments() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
----
-# this is another doc
-# great
-b: sane
-EOL
-
-  # it will be hard to remove that top level separator
-  read -r -d '' expected << EOM
-a: test
----
-b: sane
-EOM
-
-  X=$(./yq e '... comments=""'  test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalCommentsLeadingSepNoDocFlag() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
----
-# this is another doc
-# great
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
-# hi peeps
-# cool
-a: test
-# this is another doc
-# great
-b: sane
-EOM
-
-
-  X=$(./yq e '.' --no-doc test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalJsonFlag() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
-EOL
-
-cat >test2.yml <<EOL
----
-# this is another doc
-# great
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
-{
-  "a": "test"
-}
-{
-  "b": "sane"
-}
-EOM
-
-
-  X=$(./yq e '.' -j test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalAllJsonFlag() {
-  cat >test.yml <<EOL
----
-# hi peeps
-# cool
-a: test
-EOL
-
-cat >test2.yml <<EOL
----
-# this is another doc
-# great
-b: sane
-EOL
-
-  read -r -d '' expected << EOM
-{
-  "a": "test"
-}
-{
-  "b": "sane"
-}
-EOM
-
-
-  X=$(./yq ea '.' -j test.yml test2.yml)
-  assertEquals "$expected" "$X"
-}
-
-testLeadingSeperatorMultiDocEvalAll() {
-  read -r -d '' expected << EOM
----
-a: test
----
-version: 3
-application: MyApp
-EOM
-
-
-  X=$(./yq ea '.' test.yml examples/order.yaml)
-  assertEquals "$expected" "$X"
-}
-
-source ./scripts/shunit2

acceptance_tests/load-file.sh

@@ -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

acceptance_tests/output-format.sh

@@ -1,105 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-}
-
-testOutputJsonDeprecated() {
-  cat >test.yml <<EOL
-a: {b: ["cat"]}
-EOL
-
-  read -r -d '' expected << EOM
-{
-  "a": {
-    "b": [
-      "cat"
-    ]
-  }
-}
-EOM
-
-  X=$(./yq e -j test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -j test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputJson() {
-  cat >test.yml <<EOL
-a: {b: ["cat"]}
-EOL
-
-  read -r -d '' expected << EOM
-{
-  "a": {
-    "b": [
-      "cat"
-    ]
-  }
-}
-EOM
-
-  X=$(./yq e --output-format=json test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --output-format=json test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputJsonShort() {
-  cat >test.yml <<EOL
-a: {b: ["cat"]}
-EOL
-
-  read -r -d '' expected << EOM
-{
-  "a": {
-    "b": [
-      "cat"
-    ]
-  }
-}
-EOM
-
-  X=$(./yq e -o=j test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -o=j test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputProperties() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
-EOL
-
-  read -r -d '' expected << EOM
-a.b.c.0 = cat
-EOM
-
-  X=$(./yq e --output-format=props test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --output-format=props test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testOutputPropertiesShort() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
-EOL
-
-  read -r -d '' expected << EOM
-a.b.c.0 = cat
-EOM
-
-  X=$(./yq e -o=p test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea -o=p test.yml)
-  assertEquals "$expected" "$X"
-}
-
-source ./scripts/shunit2

acceptance_tests/pretty-print.sh

@@ -1,176 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-}
-
-testPrettyPrintWithBooleans() {
-  cat >test.yml <<EOL
-leaveUnquoted: [yes, no, on, off, y, n, true, false]
-leaveQuoted: ["yes", "no", "on", "off", "y", "n", "true", "false"]
-
-EOL
-
-  read -r -d '' expected << EOM
-leaveUnquoted:
-  - yes
-  - no
-  - on
-  - off
-  - y
-  - n
-  - true
-  - false
-leaveQuoted:
-  - "yes"
-  - "no"
-  - "on"
-  - "off"
-  - "y"
-  - "n"
-  - "true"
-  - "false"
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintWithBooleansCapitals() {
-  cat >test.yml <<EOL
-leaveUnquoted: [YES, NO, ON, OFF, Y, N, TRUE, FALSE]
-leaveQuoted: ["YES", "NO", "ON", "OFF", "Y", "N", "TRUE", "FALSE"]
-EOL
-
-  read -r -d '' expected << EOM
-leaveUnquoted:
-  - YES
-  - NO
-  - ON
-  - OFF
-  - Y
-  - N
-  - TRUE
-  - FALSE
-leaveQuoted:
-  - "YES"
-  - "NO"
-  - "ON"
-  - "OFF"
-  - "Y"
-  - "N"
-  - "TRUE"
-  - "FALSE"
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintOtherStringValues() {
-  cat >test.yml <<EOL
-leaveUnquoted: [yesSir, hellno, bonapite]
-makeUnquoted: ["yesSir", "hellno", "bonapite"]
-EOL
-
-  read -r -d '' expected << EOM
-leaveUnquoted:
-  - yesSir
-  - hellno
-  - bonapite
-makeUnquoted:
-  - yesSir
-  - hellno
-  - bonapite
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintKeys() {
-  cat >test.yml <<EOL
-"removeQuotes": "please"
-EOL
-
-  read -r -d '' expected << EOM
-removeQuotes: please
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintOtherStringValues() {
-  cat >test.yml <<EOL
-leaveUnquoted: [yesSir, hellno, bonapite]
-makeUnquoted: ["yesSir", "hellno", "bonapite"]
-EOL
-
-  read -r -d '' expected << EOM
-leaveUnquoted:
-  - yesSir
-  - hellno
-  - bonapite
-makeUnquoted:
-  - yesSir
-  - hellno
-  - bonapite
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintStringBlocks() {
-  cat >test.yml <<EOL
-"removeQuotes": | 
-  "please"
-EOL
-
-  read -r -d '' expected << EOM
-removeQuotes: |
-  "please"
-EOM
-
-  X=$(./yq e --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-testPrettyPrintWithExpression() {
-  cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
-EOL
-
-  read -r -d '' expected << EOM
-b:
-  c:
-    - cat
-EOM
-
-  X=$(./yq e '.a' --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-
-  X=$(./yq ea '.a' --prettyPrint test.yml)
-  assertEquals "$expected" "$X"
-}
-
-source ./scripts/shunit2

acceptance_tests/split-printer.sh

@@ -1,157 +0,0 @@
-#!/bin/bash
-
-setUp() {
-  rm test*.yml || true
-}
-
-testBasicSplitWithName() {
-  cat >test.yml <<EOL
-a: test_doc1
---- 
-a: test_doc2
-EOL
-
-  ./yq e test.yml -s ".a"
-
-  doc1=$(cat test_doc1.yml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_doc2.yml)
-  read -r -d '' expectedDoc2 << EOM
----
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-testBasicSplitWithNameEvalAll() {
-  cat >test.yml <<EOL
-a: test_doc1
---- 
-a: test_doc2
-EOL
-
-  ./yq ea test.yml -s ".a"
-
-  doc1=$(cat test_doc1.yml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_doc2.yml)
-  read -r -d '' expectedDoc2 << EOM
----
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-testBasicSplitWithIndex() {
-  cat >test.yml <<EOL
-a: test_doc1
---- 
-a: test_doc2
-EOL
-
-  ./yq e test.yml -s '"test_" + $index'
-
-  doc1=$(cat test_0.yml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_1.yml)
-  read -r -d '' expectedDoc2 << EOM
----
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-testBasicSplitWithIndexEvalAll() {
-  cat >test.yml <<EOL
-a: test_doc1
---- 
-a: test_doc2
-EOL
-
-  ./yq ea test.yml -s '"test_" + $index'
-
-  doc1=$(cat test_0.yml)
-  
-  assertEquals "a: test_doc1" "$doc1"
-
-  doc2=$(cat test_1.yml)
-  read -r -d '' expectedDoc2 << EOM
----
-a: test_doc2
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-
-testArraySplitWithNameNoSeparators() {
-  cat >test.yml <<EOL
-- name: test_fred
-  age: 35
-- name: test_catherine
-  age: 37
-EOL
-
-  ./yq e --no-doc -s ".name"  ".[]" test.yml 
-
-  doc1=$(cat test_fred.yml)
-  read -r -d '' expectedDoc1 << EOM
-name: test_fred
-age: 35
-EOM
-
-  assertEquals "$expectedDoc1" "$doc1"
-
-  doc2=$(cat test_catherine.yml)
-  read -r -d '' expectedDoc2 << EOM
-name: test_catherine
-age: 37
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-}
-
-testArraySplitWithNameNoSeparatorsEvalAll() {
-  cat >test.yml <<EOL
-- name: test_fred
-  age: 35
-- name: test_catherine
-  age: 37
-EOL
-
-cat >test2.yml <<EOL
-- name: test_mike
-  age: 564
-EOL
-
-  ./yq ea --no-doc -s ".name"  ".[]" test.yml test2.yml
-
-  doc1=$(cat test_fred.yml)
-  read -r -d '' expectedDoc1 << EOM
-name: test_fred
-age: 35
-EOM
-
-  assertEquals "$expectedDoc1" "$doc1"
-
-  doc2=$(cat test_catherine.yml)
-  read -r -d '' expectedDoc2 << EOM
-name: test_catherine
-age: 37
-EOM
-  assertEquals "$expectedDoc2" "$doc2"
-
-
-  doc3=$(cat test_mike.yml)
-  read -r -d '' expectedDoc3 << EOM
-name: test_mike
-age: 564
-EOM
-  assertEquals "$expectedDoc3" "$doc3"
-}
-
-source ./scripts/shunit2

action.yml

@@ -1,15 +1,11 @@
 name: 'yq - portable yaml processor'
 description: 'create, read, update, delete, merge, validate and do more with yaml'
-branding:
-  icon: command
-  color: gray-dark
+icon: command
+color: gray-dark
 inputs:
   cmd:
     description: 'The Command which should be run'
     required: true
-outputs:
-  result:
-    description: "The complete result from the yq command being run"
 runs:
   using: 'docker'
   image: 'github-action/Dockerfile'

cmd/constant.go

@@ -1,11 +1,9 @@
 package cmd
 
-var leadingContentPreProcessing = true
 var unwrapScalar = true
 
 var writeInplace = false
 var outputToJSON = false
-var outputFormat = "yaml"
 
 var exitStatus = false
 var forceColor = false
@@ -16,11 +14,5 @@ var noDocSeparators = false
 var nullInput = false
 var verbose = false
 var version = false
-var prettyPrint = false
-
-// can be either "" (off), "extract" or "process"
-var frontMatter = ""
-
-var splitFileExp = ""
 
 var completedSuccessfully = false

cmd/evaluate_all_command.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"errors"
+	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -14,53 +15,41 @@ func createEvaluateAllCommand() *cobra.Command {
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
 		Example: `
-# Merge f2.yml into f1.yml (inplace)
-yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml
-## the same command and expression using shortened names:
-yq ea -i 'select(fi == 0) * select(fi == 1)' f1.yml f2.yml
-
-
-# Merge all given files
-yq ea '. as $item ireduce ({}; . * $item )' file1.yml file2.yml ...
-
-# Pipe from STDIN
-## use '-' as a filename to pipe from STDIN
-cat file2.yml | yq ea '.a.b' file1.yml - file3.yml
-`,
-		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
-See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.
-
-## Evaluate All ##
-This command loads _all_ yaml documents of _all_ yaml files and runs expression once
-Useful when you need to run an expression across several yaml documents or files (like merge).
-Note that it consumes more memory than eval.
+# merges f2.yml into f1.yml (inplace)
+yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
 `,
+		Long: "Evaluate All:\nUseful when you need to run an expression across several yaml documents or files. Consumes more memory than eval",
 		RunE: evaluateAll,
 	}
 	return cmdEvalAll
 }
 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
-
-	firstFileIndex, 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
+	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -70,48 +59,25 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
 	}
 
-	format, err := yqlib.OutputFormatFromString(outputFormat)
-	if err != nil {
-		return err
-	}
-
-	printerWriter := configurePrinterWriter(format, out)
-
-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
-
-	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
-		err = frontMatterHandler.Split()
-		if err != nil {
-			return err
-		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
-
-		if frontMatter == "process" {
-			reader := frontMatterHandler.GetContentReader()
-			printer.SetAppendix(reader)
-			defer yqlib.SafelyCloseReader(reader)
-		}
-		defer frontMatterHandler.CleanUp()
-	}
+	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
 
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+			err = allAtOnceEvaluator.EvaluateFiles("", []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
+			err = yqlib.NewStreamEvaluator().EvaluateNew(args[0], printer)
 		} else {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
+			err = allAtOnceEvaluator.EvaluateFiles("", []string{args[0]}, printer)
 		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = allAtOnceEvaluator.EvaluateFiles(args[0], args[1:], printer)
 	}
 
 	completedSuccessfully = err == nil

cmd/evalute_sequence_command.go

@@ -13,67 +13,53 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "Apply the expression to each document in each yaml file in sequence",
+		Short:   "Apply expression to each document in each yaml file given in sequence",
 		Example: `
-# Reads field under the given path for each file
-yq e '.a.b' f1.yml f2.yml 
+# runs the expression against each file, in series
+yq e '.a.b | length' f1.yml f2.yml 
 
-# Prints out the file
+# prints out the file
 yq e sample.yaml 
 
-# Pipe from STDIN
-## use '-' as a filename to pipe from STDIN
-cat file2.yml | yq e '.a.b' file1.yml - file3.yml
-
-# Creates a new yaml document
-## Note that editing an empty file does not work.
+# prints a new yaml document
 yq e -n '.a.b.c = "cat"' 
 
-# Update a file inplace
+
+# updates file.yaml directly
 yq e '.a.b = "cool"' -i file.yaml 
 `,
-		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.
-
-## Evaluate Sequence ##
-This command iterates over each yaml document from each given file, applies the 
-expression and prints the result in sequence.`,
+		Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
 		RunE: evaluateSequence,
 	}
 	return cmdEvalSequence
 }
-
-func processExpression(expression string) string {
-	var prettyPrintExp = `(... | (select(tag != "!!str"), select(tag == "!!str") | select(test("(?i)^(y|yes|n|no|on|off)$") | not))  ) style=""`
-	if prettyPrint && expression == "" {
-		return prettyPrintExp
-	} else if prettyPrint {
-		return fmt.Sprintf("%v | %v", expression, prettyPrintExp)
-	}
-	return expression
-}
-
 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
-	firstFileIndex, 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
+	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -83,49 +69,26 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
 	}
 
-	format, err := yqlib.OutputFormatFromString(outputFormat)
-	if err != nil {
-		return err
-	}
-
-	printerWriter := configurePrinterWriter(format, out)
-
-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
 
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
-	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
-		err = frontMatterHandler.Split()
-		if err != nil {
-			return err
-		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
-
-		if frontMatter == "process" {
-			reader := frontMatterHandler.GetContentReader()
-			printer.SetAppendix(reader)
-			defer yqlib.SafelyCloseReader(reader)
-		}
-		defer frontMatterHandler.CleanUp()
-	}
-
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+			err = streamEvaluator.EvaluateFiles("", []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
+			err = streamEvaluator.EvaluateNew(args[0], printer)
 		} else {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
+			err = streamEvaluator.EvaluateFiles("", []string{args[0]}, printer)
 		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = streamEvaluator.EvaluateFiles(args[0], args[1:], printer)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -11,8 +11,7 @@ func New() *cobra.Command {
 	var rootCmd = &cobra.Command{
 		Use:   "yq",
 		Short: "yq is a lightweight and portable command-line YAML processor.",
-		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
-See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
+		Long:  `yq is a lightweight and portable command-line YAML processor. It aims to be the jq or sed of yaml files.`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if version {
 				cmd.Print(GetVersionDisplay())
@@ -41,14 +40,7 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 	}
 
 	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose mode")
-
-	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "(deprecated) output as json. Set indent to 0 to print json in one line.")
-	err := rootCmd.PersistentFlags().MarkDeprecated("tojson", "please use -o=json instead")
-	if err != nil {
-		panic(err)
-	}
-
-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p] output format type.")
+	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "output as json. Set indent to 0 to print json in one line.")
 	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 (---)")
 
@@ -56,16 +48,10 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
 	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace of first yaml file given.")
 	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
-	rootCmd.PersistentFlags().BoolVarP(&prettyPrint, "prettyPrint", "P", false, "pretty print, shorthand for '... style = \"\"'")
 	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")
 
 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
-	rootCmd.PersistentFlags().StringVarP(&frontMatter, "front-matter", "f", "", "(extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression. This is a workaround for go-yaml to persist header content properly.")
-
-	rootCmd.PersistentFlags().StringVarP(&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.AddCommand(
 		createEvaluateSequenceCommand(),
 		createEvaluateAllCommand(),

cmd/utils.go

@@ -1,63 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"io"
-	"os"
-
-	"github.com/mikefarah/yq/v4/pkg/yqlib"
-	"github.com/spf13/cobra"
-)
-
-func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
-	cmd.SilenceUsage = true
-
-	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
-	}
-
-	// backwards compatibility
-	if outputToJSON {
-		outputFormat = "json"
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
-		return 0, fmt.Errorf("write inplace flag only applicable when giving an expression and at least one file")
-	}
-
-	if writeInplace && splitFileExp != "" {
-		return 0, fmt.Errorf("write inplace cannot be used with split file")
-	}
-
-	if nullInput && len(args) > 1 {
-		return 0, fmt.Errorf("cannot pass files in when using null-input flag")
-	}
-
-	return firstFileIndex, nil
-}
-
-func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) yqlib.PrinterWriter {
-
-	var printerWriter yqlib.PrinterWriter
-
-	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
-}

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.16.2"
+	Version = "4.1.0"
 
 	// 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
@@ -25,7 +25,7 @@ const ProductName = "yq"
 // GetVersionDisplay composes the parts of the version in a way that's suitable
 // for displaying to humans.
 func GetVersionDisplay() string {
-	return fmt.Sprintf("yq (https://github.com/mikefarah/yq/) version %s\n", getHumanVersion())
+	return fmt.Sprintf("%s version %s\n", ProductName, getHumanVersion())
 }
 
 func getHumanVersion() string {

cmd/version_test.go

@@ -3,7 +3,7 @@ package cmd
 import "testing"
 
 func TestGetVersionDisplay(t *testing.T) {
-	var expectedVersion = ProductName + " (https://github.com/mikefarah/yq/) version " + Version
+	var expectedVersion = ProductName + " version " + Version
 	if VersionPrerelease != "" {
 		expectedVersion = expectedVersion + "-" + VersionPrerelease
 	}

debian/changelog

@@ -1,28 +1,3 @@
-yq (4.13.0) focal; urgency=medium
-
-  * New `with` operator for making multiple changes to a given path
-  * New `contains` operator, works like the `jq` equivalent
-  * Subtract operator now supports subtracting elements from arrays!
-  * Fixed Swapping values using variables #934
-  * Github Action now properly supports multiline output #936, thanks @pjxiao
-  * Fixed missing closing bracket validation #932
-  * Fix processing of hex numbers #929
-  * Fixed alternative and union operator issues #930
-  * Can now convert yaml to properties properties format (`-o=props`), See [docs](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties) for more info.
-  * Fixed document header/footer comment handling when merging (https://github.com/mikefarah/yq/issues/919)
-  * pretty print yaml 1.1 compatibility  (https://github.com/mikefarah/yq/issues/914)
-
- -- Roberto Mier Escandon <rmescandon@gmail.com>  Thu, 16 Sep 2021 20:58:30 +0200
-
-yq (4.9.6) focal; urgency=medium
-
-  * Added darwin/arm64 build, thanks @alecthomas
-  * Incremented docker alpine base version, thanks @da6d6i7-bronga
-  * Bug fix: multine expression
-  * Bug fix: special character
-
- -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 29 Jun 2021 21:32:14 +0200
-
 yq (3.3.2) focal; urgency=medium
 
   * Bug fix: existStatus bug (#459)

debian/control

@@ -3,7 +3,8 @@ Section: devel
 Priority: optional
 Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Build-Depends: debhelper (>=10),
-               golang-1.15,
+               dh-golang (>=1.34),
+               golang-1.13,
                rsync
 Standards-Version: 4.1.4
 Homepage: https://github.com/mikefarah/yq.git

debian/rules

@@ -17,7 +17,7 @@
 PROJECT := yq
 OWNER := mikefarah
 REPO := github.com
-GOVERSION := 1.15
+GOVERSION := 1.13
 
 export DH_OPTIONS
 export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
@@ -34,7 +34,7 @@ BINDIR := /usr/bin
 ASSETSDIR := /usr/share/${PROJECT}
 
 %:
-	dh $@
+	dh $@ --builddirectory=${GOPATH} --buildsystem=golang
 
 override_dh_auto_build:
 	mkdir -p ${SRCDIR}
@@ -45,9 +45,7 @@ override_dh_auto_build:
 	(cd ${SRCDIR} && go install -buildmode=pie ./...)
 	
 override_dh_auto_test:
-ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
 	(cd ${SRCDIR} && go test -v ./...)
-endif
 
 override_dh_auto_install:
 	cp ${GOBIN}/yq ${DESTDIR}/${BINDIR}

examples/data1.yaml

@@ -1,15 +1,4 @@
-strings:
-  - a: banana
-  - a: cat
-  - a: apple
-
-numbers:
-  - a: 12
-  - a: 13
-  - a: 120
-
-
-obj:
-  - a: {cat: "adog"}
-  - a: {cat: "doga"}
-  - a: apple
+a: simple # just the best
+b: [1, 2]
+c:
+  test: 1

examples/data2.yaml

@@ -1,2 +1,7 @@
+a: other # better than the original
+b: [3, 4]
 c:
-  d: hamster
+  toast: leave
+  test: 1
+  tell: 1
+  tasty.taco: cool

examples/empty.yaml

@@ -1 +1,2 @@
-# comment
+# a: apple
+# b: cat

examples/front-matter.yaml

@@ -1,6 +0,0 @@
----
-a: apple
-b: bannana
----
-hello there
-apples: great

examples/leading-seperator.yaml

@@ -1,2 +0,0 @@
----
-a: test

examples/thing.yml

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

github-action/Dockerfile

@@ -1,8 +1,5 @@
-FROM mikefarah/yq:4
+FROM mikefarah/yq:3
 
 COPY entrypoint.sh /entrypoint.sh
 
-# this seems to be the default user in github actions
-USER 1001
-
 ENTRYPOINT ["/entrypoint.sh"]

github-action/entrypoint.sh

@@ -1,9 +1,4 @@
 #!/bin/sh -l
-set -e
-echo "::debug::\$cmd: $1"
-RESULT=$(eval "$1")
-RESULT="${RESULT//'%'/'%25'}"
-RESULT="${RESULT//$'\n'/'%0A'}"
-RESULT="${RESULT//$'\r'/'%0D'}"
-echo "::debug::\$RESULT: $RESULT"
-echo ::set-output name=result::"$RESULT"
+
+echo "$1"
+eval $1

go.mod

@@ -1,25 +1,18 @@
 module github.com/mikefarah/yq/v4
 
 require (
-	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.13.0
-	github.com/goccy/go-yaml v1.9.4
-	github.com/jinzhu/copier v0.3.4
-	github.com/magiconair/properties v1.8.5
-	github.com/spf13/cobra v1.3.0
-	github.com/timtadh/lexmachine v0.2.2
-	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
-)
-
-require (
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/mattn/go-colorable v0.1.12 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/elliotchance/orderedmap v1.3.0
+	github.com/fatih/color v1.9.0
+	github.com/goccy/go-yaml v1.8.1
+	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
+	github.com/mattn/go-colorable v0.1.7 // indirect
+	github.com/spf13/cobra v1.1.1
 	github.com/timtadh/data-structures v0.5.3 // indirect
-	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
+	github.com/timtadh/lexmachine v0.2.2
+	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
+	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
 )
 
-go 1.17
+go 1.15

go.sum

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@@ -392,27 +218,16 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -621,40 +300,10 @@ google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
 google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
 google.golang.org/api v0.13.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
-google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
-google.golang.org/api v0.15.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
-google.golang.org/api v0.17.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
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 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
-google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
-google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
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 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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@@ -664,127 +313,32 @@ google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
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-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
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 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
+gopkg.in/go-playground/validator.v9 v9.30.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
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 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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how-it-works.md

@@ -1,129 +0,0 @@
-# How it works
-
-In `yq` expressions are made up of operators and pipes. A context of nodes is passed through the expression and each operation takes the context as input and returns a new context as output. That output is piped in as input for the next operation in the expression. To begin with, the context is set to the first yaml document of the first yaml file (if processing in sequence using eval).
-
-Lets look at a couple of examples.
-
-## Simple assignment example
-
-Given a document like:
-
-```yaml
-a: cat
-b: dog
-```
-
-with an expression:
-
-```
-.a = .b
-```
-
-Like math expression - operator precedence is important. 
-
-The `=` operator takes two arguments, a `lhs` expression, which in this case is `.a` and `rhs` expression which is `.b`. 
-
-It pipes the current, lets call it 'root' context through the `lhs` expression of `.a` to return the node 
-
-```yaml
-cat
-```
-
-Sidenote: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
-
-The `=` operator then pipes the 'root' context through the `rhs` expression of `.b` to return the node
-
-```yaml
-dog
-```
-
-Both sides have now been evaluated, so now the operator copies across the value from the RHS (`.b`) to the the LHS (`.a`), and it returns the now updated context:
-
-```yaml
-a: dog
-b: dog
-```
-
-
-## Complex assignment, operator precedence rules
-
-Just like math expression - `yq` expression have an order of precedence. The pipe `|` operator has a low order of precedence, so operators with higher precedence will get evalated first. 
-
-Most of the time, this is intuitively what you'd want, for instance `.a = "cat" | .b = "dog"` is effectively: `(.a = "cat") | (.b = "dog")`.
-
-However, this is not always the case, particularly if you have a complex LHS or RHS expression, for instance if you want to select particular nodes to update. 
-
-Lets say you had:
-
-```yaml
-- name: bob
-  fruit: apple
-- name: sally
-  fruit: orange
-
-```
-
-Lets say you wanted to update the `sally` entry to have fruit: 'mango'. The _incorrect_ way to do that is:
-`.[] | select(.name == "sally") | .fruit = "mango"`.
-
-Becasue `|` has a low operator precedence, this will be evaluated (_incorrectly_) as : `(.[]) | (select(.name == "sally")) | (.fruit = "mango")`. What you'll see is only the updated segment returned:
-
-```yaml
-name: sally
-fruit: mango
-```
-
-To properly update this yaml, you will need to use brackets (think BODMAS from maths) and wrap the entire LHS:
-`(.[] | select(.name == "sally") | .fruit) = "mango"`
-
-
-Now that entire LHS expression is passed to the 'assign' (`=`) operator, and the yaml is correctly updated and returned:
-
-
-```yaml
-- name: bob
-  fruit: apple
-- name: sally
-  fruit: mango
-
-```
-
-## Relative update (e.g. `|=`)
-There is another form of the `=` operator which we call the relative form. It's very similar to `=` but with one key difference when evaluating the RHS expression.
-
-In the plain form, we pass in the 'root' level context to the RHS expression. In relative form, we pass in _each result of the LHS_ to the RHS expression. Let's go through an example.
-
-Given a document like:
-
-```yaml
-a: 1
-b: thing
-```
-
-with an expression:
-
-```
-.a |= . + 1
-```
-
-Similar to the `=` operator, `|=` takes two operands, the LHS and RHS.
-
-It pipes the current context (the whole document) through the LHS expression of `.a` to get the node value:
-
-```
-1
-```
-
-Now it pipes _that LHS context_ into the RHS expression `. + 1` (whereas in the `=` plain form it piped the original document context into the RHS) to yield:
-
-
-```
-2
-```
-
-The assignment operator then copies across the value from the RHS to the value on the LHS, and it returns the now updated 'root' context:
-
-```yaml
-a: 2
-b: thing
-```

merge-array-by-key.sh

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

pkg/yqlib/all_at_once_evaluator.go

@@ -1,66 +1,35 @@
 package yqlib
 
-import (
-	"container/list"
+import "container/list"
 
-	yaml "gopkg.in/yaml.v3"
-)
-
-// A yaml expression evaluator that runs the expression once against all files/nodes in memory.
+/**
+	Loads all yaml documents of all files given into memory, then runs the given expression once.
+**/
 type Evaluator interface {
-	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)
-
-	// EvaluateCandidateNodes takes an expression and list of candidate nodes, returning a list of matching candidate nodes
-	EvaluateCandidateNodes(expression string, inputCandidateNodes *list.List) (*list.List, error)
+	EvaluateFiles(expression string, filenames []string, printer Printer) error
 }
 
 type allAtOnceEvaluator struct {
 	treeNavigator DataTreeNavigator
-	treeCreator   ExpressionParser
+	treeCreator   PathTreeCreator
 }
 
 func NewAllAtOnceEvaluator() Evaluator {
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewPathTreeCreator()}
 }
 
-func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error) {
-	inputCandidates := list.New()
-	for _, node := range nodes {
-		inputCandidates.PushBack(&CandidateNode{Node: node})
-	}
-	return e.EvaluateCandidateNodes(expression, inputCandidates)
-}
-
-func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
-	node, err := e.treeCreator.ParseExpression(expression)
-	if err != nil {
-		return nil, err
-	}
-	context, err := e.treeNavigator.GetMatchingNodes(Context{MatchingNodes: inputCandidates}, node)
-	if err != nil {
-		return nil, err
-	}
-	return context.MatchingNodes, nil
-}
-
-func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) error {
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer) error {
 	fileIndex := 0
-	firstFileLeadingContent := ""
-
-	var allDocuments = list.New()
+	node, err := treeCreator.ParsePath(expression)
+	if err != nil {
+		return err
+	}
+	var allDocuments *list.List = list.New()
 	for _, filename := range filenames {
-		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
+		reader, err := readStream(filename)
 		if err != nil {
 			return err
 		}
-
-		if fileIndex == 0 {
-			firstFileLeadingContent = leadingContent
-		}
-
 		fileDocuments, err := readDocuments(reader, filename, fileIndex)
 		if err != nil {
 			return err
@@ -68,21 +37,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 		allDocuments.PushBackList(fileDocuments)
 		fileIndex = fileIndex + 1
 	}
-
-	if allDocuments.Len() == 0 {
-		candidateNode := &CandidateNode{
-			Document:       0,
-			Filename:       "",
-			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
-			FileIndex:      0,
-			LeadingContent: firstFileLeadingContent,
-		}
-		allDocuments.PushBack(candidateNode)
-	} else {
-		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
-	}
-
-	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
+	matches, err := treeNavigator.GetMatchingNodes(allDocuments, node)
 	if err != nil {
 		return err
 	}

pkg/yqlib/all_at_once_evaluator_test.go

@@ -1,40 +0,0 @@
-package yqlib
-
-import (
-	"testing"
-
-	"github.com/mikefarah/yq/v4/test"
-)
-
-var evaluateNodesScenario = []expressionScenario{
-	{
-		document:   `a: hello`,
-		expression: `.a`,
-		expected: []string{
-			"D0, P[a], (!!str)::hello\n",
-		},
-	},
-	{
-		document:   `a: hello`,
-		expression: `.`,
-		expected: []string{
-			"D0, P[], (doc)::a: hello\n",
-		},
-	},
-	{
-		document:   `- a: "yes"`,
-		expression: `.[] | has("a")`,
-		expected: []string{
-			"D0, P[0], (!!bool)::true\n",
-		},
-	},
-}
-
-func TestAllAtOnceEvaluateNodes(t *testing.T) {
-	var evaluator = NewAllAtOnceEvaluator()
-	for _, tt := range evaluateNodesScenario {
-		node := test.ParseData(tt.document)
-		list, _ := evaluator.EvaluateNodes(tt.expression, &node)
-		test.AssertResultComplex(t, tt.expected, resultsToString(t, list))
-	}
-}

pkg/yqlib/candidate_node.go

@@ -1,8 +1,8 @@
 package yqlib
 
 import (
-	"container/list"
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/jinzhu/copier"
@@ -10,99 +10,18 @@ import (
 )
 
 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
-
+	Node      *yaml.Node    // the actual 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 propegate to child nodes.
-	EvaluateTogether bool
-	IsMapKey         bool
 }
 
 func (n *CandidateNode) GetKey() string {
-	keyPrefix := ""
-	if n.IsMapKey {
-		keyPrefix = "key-"
-	}
-	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
+	return fmt.Sprintf("%v - %v", 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
-	}
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(value),
-		Parent:    n,
-		Key:       key,
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
-	}
-}
-
-func (n *CandidateNode) CreateChildInArray(index int, node *yaml.Node) *CandidateNode {
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(index),
-		Parent:    n,
-		Key:       &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", index), Tag: "!!int"},
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
-	}
-}
-
-func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(nil),
-		Parent:    n.Parent,
-		Key:       n.Key,
-		IsMapKey:  n.IsMapKey,
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
-	}
-}
-
-func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
-	if path == nil {
-		newPath := make([]interface{}, len(n.Path))
-		copy(newPath, n.Path)
-		return newPath
-	}
-
+func (n *CandidateNode) CreateChildPath(path interface{}) []interface{} {
 	//don't use append as they may actually modify the path of the orignal node!
 	newPath := make([]interface{}, len(n.Path)+1)
 	copy(newPath, n.Path)
@@ -120,15 +39,14 @@ func (n *CandidateNode) Copy() (*CandidateNode, error) {
 }
 
 // updates this candidate from the given candidate node
-func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
-
-	n.UpdateAttributesFrom(other, prefs)
+func (n *CandidateNode) UpdateFrom(other *CandidateNode) {
+	n.UpdateAttributesFrom(other)
 	n.Node.Content = other.Node.Content
 	n.Node.Value = other.Node.Value
+	n.Node.Alias = other.Node.Alias
 }
 
-func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
-	log.Debug("UpdateAttributesFrom: n: %v other: %v", n.GetKey(), other.GetKey())
+func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 	if n.Node.Kind != other.Node.Kind {
 		// clear out the contents when switching to a different type
 		// e.g. map to array
@@ -137,25 +55,56 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	}
 	n.Node.Kind = other.Node.Kind
 	n.Node.Tag = other.Node.Tag
-	n.Node.Alias = other.Node.Alias
-
-	if !prefs.DontOverWriteAnchor {
-		n.Node.Anchor = other.Node.Anchor
-	}
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes
 	if n.Node.Style == 0 {
 		n.Node.Style = other.Node.Style
 	}
+	n.Node.FootComment = n.Node.FootComment + other.Node.FootComment
+	n.Node.HeadComment = n.Node.HeadComment + other.Node.HeadComment
+	n.Node.LineComment = n.Node.LineComment + other.Node.LineComment
+}
 
-	if other.Node.FootComment != "" {
-		n.Node.FootComment = other.Node.FootComment
-	}
-	if other.Node.HeadComment != "" {
-		n.Node.HeadComment = other.Node.HeadComment
-	}
-	if other.Node.LineComment != "" {
-		n.Node.LineComment = other.Node.LineComment
+func (n *CandidateNode) PathStackToString() string {
+	return mergePathStackToString(n.Path)
+}
+
+func mergePathStackToString(pathStack []interface{}) string {
+	var sb strings.Builder
+	for index, path := range pathStack {
+		switch path.(type) {
+		case int, int64:
+			// if arrayMergeStrategy == AppendArrayMergeStrategy {
+			// sb.WriteString("[+]")
+			// } else {
+			sb.WriteString(fmt.Sprintf("[%v]", path))
+			// }
+
+		default:
+			s := fmt.Sprintf("%v", path)
+			var _, errParsingInt = strconv.ParseInt(s, 10, 64) // nolint
+
+			hasSpecial := strings.Contains(s, ".") || strings.Contains(s, "[") || strings.Contains(s, "]") || strings.Contains(s, "\"")
+			hasDoubleQuotes := strings.Contains(s, "\"")
+			wrappingCharacterStart := "\""
+			wrappingCharacterEnd := "\""
+			if hasDoubleQuotes {
+				wrappingCharacterStart = "("
+				wrappingCharacterEnd = ")"
+			}
+			if hasSpecial || errParsingInt == nil {
+				sb.WriteString(wrappingCharacterStart)
+			}
+			sb.WriteString(s)
+			if hasSpecial || errParsingInt == nil {
+				sb.WriteString(wrappingCharacterEnd)
+			}
+		}
+
+		if index < len(pathStack)-1 {
+			sb.WriteString(".")
+		}
 	}
+	return sb.String()
 }

pkg/yqlib/color_print.go

@@ -17,8 +17,8 @@ func format(attr color.Attribute) string {
 	return fmt.Sprintf("%s[%dm", escape, attr)
 }
 
-func colorizeAndPrint(yamlBytes []byte, writer io.Writer) error {
-	tokens := lexer.Tokenize(string(yamlBytes))
+func ColorizeAndPrint(bytes []byte, writer io.Writer) error {
+	tokens := lexer.Tokenize(string(bytes))
 	var p printer.Printer
 	p.Bool = func() *printer.Property {
 		return &printer.Property{

pkg/yqlib/context.go

@@ -1,109 +0,0 @@
-package yqlib
-
-import (
-	"container/list"
-	"fmt"
-
-	"github.com/jinzhu/copier"
-	logging "gopkg.in/op/go-logging.v1"
-)
-
-type Context struct {
-	MatchingNodes  *list.List
-	Variables      map[string]*list.List
-	DontAutoCreate bool
-}
-
-func (n *Context) SingleReadonlyChildContext(candidate *CandidateNode) Context {
-	list := list.New()
-	list.PushBack(candidate)
-	newContext := n.ChildContext(list)
-	newContext.DontAutoCreate = true
-	return newContext
-}
-
-func (n *Context) SingleChildContext(candidate *CandidateNode) Context {
-	list := list.New()
-	list.PushBack(candidate)
-	return n.ChildContext(list)
-}
-
-func (n *Context) GetVariable(name string) *list.List {
-	if n.Variables == nil {
-		return nil
-	}
-	return n.Variables[name]
-}
-
-func (n *Context) SetVariable(name string, value *list.List) {
-	if n.Variables == nil {
-		n.Variables = make(map[string]*list.List)
-	}
-	n.Variables[name] = value
-}
-
-func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{DontAutoCreate: n.DontAutoCreate}
-	clone.Variables = make(map[string]*list.List)
-	if len(n.Variables) > 0 {
-		err := copier.Copy(&clone.Variables, n.Variables)
-		if err != nil {
-			log.Error("Error cloning context :(")
-			panic(err)
-		}
-	}
-	clone.MatchingNodes = results
-	return clone
-}
-
-func (n *Context) ToString() string {
-	if !log.IsEnabledFor(logging.DEBUG) {
-		return ""
-	}
-	result := fmt.Sprintf("Context\nDontAutoCreate: %v\n", n.DontAutoCreate)
-	return result + NodesToString(n.MatchingNodes)
-}
-
-func (n *Context) DeepClone() Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-	// copier doesn't do lists properly for some reason
-	clone.MatchingNodes = list.New()
-	for el := n.MatchingNodes.Front(); el != nil; el = el.Next() {
-		clonedNode, err := el.Value.(*CandidateNode).Copy()
-		if err != nil {
-			log.Error("Error cloning context :(")
-			panic(err)
-		}
-		clone.MatchingNodes.PushBack(clonedNode)
-	}
-
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	return clone
-}
-
-func (n *Context) Clone() Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	return clone
-}
-
-func (n *Context) ReadOnlyClone() Context {
-	clone := n.Clone()
-	clone.DontAutoCreate = true
-	return clone
-}
-
-func (n *Context) WritableClone() Context {
-	clone := n.Clone()
-	clone.DontAutoCreate = false
-	return clone
-}

pkg/yqlib/data_tree_navigator.go

@@ -3,14 +3,16 @@ package yqlib
 import (
 	"fmt"
 
+	"container/list"
+
 	logging "gopkg.in/op/go-logging.v1"
 )
 
 type DataTreeNavigator interface {
-	// given the context and a expressionNode,
-	// this will process the against the given expressionNode and return
-	// a new context of matching candidates
-	GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error)
+	// given a list of CandidateEntities and a pathNode,
+	// this will process the list against the given pathNode and return
+	// a new list of matching candidates
+	GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error)
 }
 
 type dataTreeNavigator struct {
@@ -20,22 +22,22 @@ func NewDataTreeNavigator() DataTreeNavigator {
 	return &dataTreeNavigator{}
 }
 
-func (d *dataTreeNavigator) GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error) {
-	if expressionNode == nil {
+func (d *dataTreeNavigator) GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	if pathNode == nil {
 		log.Debugf("getMatchingNodes - nothing to do")
-		return context, nil
+		return matchingNodes, nil
 	}
-	log.Debugf("Processing Op: %v", expressionNode.Operation.toString())
+	log.Debugf("Processing Op: %v", pathNode.Operation.toString())
 	if log.IsEnabledFor(logging.DEBUG) {
-		for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+		for el := matchingNodes.Front(); el != nil; el = el.Next() {
 			log.Debug(NodeToString(el.Value.(*CandidateNode)))
 		}
 	}
 	log.Debug(">>")
-	handler := expressionNode.Operation.OperationType.Handler
+	handler := pathNode.Operation.OperationType.Handler
 	if handler != nil {
-		return handler(d, context, expressionNode)
+		return handler(d, matchingNodes, pathNode)
 	}
-	return Context{}, fmt.Errorf("Unknown operator %v", expressionNode.Operation.OperationType)
+	return nil, fmt.Errorf("Unknown operator %v", pathNode.Operation.OperationType)
 
 }

pkg/yqlib/doc/Add.md

@@ -0,0 +1,133 @@
+Add behaves differently according to the type of the LHS:
+- arrays: concatenate
+- number scalars: arithmetic addition (soon)
+- string scalars: concatenate (soon)
+
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.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 object to array
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+c:
+  cat: meow
+```
+then
+```bash
+yq eval '.a + .c' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- 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
+```
+
+## Update array (append)
+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
+```
+

pkg/yqlib/doc/Alternative (Default value).md

@@ -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

pkg/yqlib/doc/Anchor and Alias Operators.md

@@ -0,0 +1,161 @@
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference 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.
+
+
+## Get anchor
+Given a sample.yml file of:
+```yaml
+a: &billyBob cat
+```
+then
+```bash
+yq eval '.a | anchor' sample.yml
+```
+will output
+```yaml
+billyBob
+```
+
+## Set anchor
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a anchor = "foobar"' sample.yml
+```
+will output
+```yaml
+a: &foobar cat
+```
+
+## Get alias
+Given a sample.yml file of:
+```yaml
+b: &billyBob meow
+a: *billyBob
+```
+then
+```bash
+yq eval '.a | alias' sample.yml
+```
+will output
+```yaml
+billyBob
+```
+
+## Set alias
+Given a sample.yml file of:
+```yaml
+b: &meow purr
+a: cat
+```
+then
+```bash
+yq eval '.a alias = "meow"' sample.yml
+```
+will output
+```yaml
+b: &meow purr
+a: *meow
+```
+
+## Explode alias and anchor
+Given a sample.yml file of:
+```yaml
+f:
+  a: &a cat
+  b: *a
+```
+then
+```bash
+yq eval 'explode(.f)' sample.yml
+```
+will output
+```yaml
+f:
+  a: cat
+  b: cat
+```
+
+## Explode with no aliases or anchors
+Given a sample.yml file of:
+```yaml
+a: mike
+```
+then
+```bash
+yq eval 'explode(.a)' sample.yml
+```
+will output
+```yaml
+a: mike
+```
+
+## Explode with alias keys
+Given a sample.yml file of:
+```yaml
+f:
+  a: &a cat
+  *a: b
+```
+then
+```bash
+yq eval 'explode(.f)' sample.yml
+```
+will output
+```yaml
+f:
+  a: cat
+  cat: b
+```
+
+## Explode 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 'explode(.)' sample.yml
+```
+will output
+```yaml
+foo:
+  a: foo_a
+  thing: foo_thing
+  c: foo_c
+bar:
+  b: bar_b
+  thing: bar_thing
+  c: bar_c
+foobarList:
+  b: bar_b
+  a: foo_a
+  thing: bar_thing
+  c: foobarList_c
+foobar:
+  c: foo_c
+  a: foo_a
+  thing: foobar_thing
+```
+

pkg/yqlib/doc/Assign.md

@@ -1,5 +1,3 @@
-# Assign (Update)
-
 This operator is used to update node values. It can be used in either the:
 
 ### plain form: `=`
@@ -36,45 +34,6 @@ a:
   g: foof
 ```
 
-## Double elements in an array
-Given a sample.yml file of:
-```yaml
-- 1
-- 2
-- 3
-```
-then
-```bash
-yq eval '.[] |= . * 2' sample.yml
-```
-will output
-```yaml
-- 2
-- 4
-- 6
-```
-
-## Update node from another file
-Note this will also work when the second file is a scalar (string/number)
-
-Given a sample.yml file of:
-```yaml
-a: apples
-```
-And another sample another.yml file of:
-```yaml
-b: bob
-```
-then
-```bash
-yq eval-all 'select(fileIndex==0).a = select(fileIndex==1) | select(fileIndex==0)' sample.yml another.yml
-```
-will output
-```yaml
-a:
-  b: bob
-```
-
 ## Update node to be the sibling value
 Given a sample.yml file of:
 ```yaml
@@ -101,7 +60,7 @@ c: fieldC
 ```
 then
 ```bash
-yq eval '(.a, .c) = "potatoe"' sample.yml
+yq eval '(.a, .c) |= "potatoe"' sample.yml
 ```
 will output
 ```yaml
@@ -144,9 +103,7 @@ a:
   b: frog
 ```
 
-## Update deeply selected results
-Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.
-
+## Update selected results
 Given a sample.yml file of:
 ```yaml
 a:
@@ -196,22 +153,6 @@ will output
 {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 eval '.a = "dog"' sample.yml
-```
-will output
-```yaml
-a: &cool dog
-```
-
 ## Update empty object and array
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Boolean Operators.md

@@ -0,0 +1,113 @@
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
+## OR example
+Running
+```bash
+yq eval --null-input 'true or false'
+```
+will output
+```yaml
+true
+```
+
+## AND example
+Running
+```bash
+yq eval --null-input 'true and false'
+```
+will output
+```yaml
+false
+```
+
+## Matching nodes with select, equals and or
+Given a sample.yml file of:
+```yaml
+- a: bird
+  b: dog
+- a: frog
+  b: bird
+- a: cat
+  b: fly
+```
+then
+```bash
+yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+```
+will output
+```yaml
+- a: bird
+  b: dog
+- a: cat
+  b: fly
+```
+
+## Not true is false
+Running
+```bash
+yq eval --null-input 'true | not'
+```
+will output
+```yaml
+false
+```
+
+## Not false is true
+Running
+```bash
+yq eval --null-input 'false | not'
+```
+will output
+```yaml
+true
+```
+
+## String values considered to be true
+Running
+```bash
+yq eval --null-input '"cat" | not'
+```
+will output
+```yaml
+false
+```
+
+## Empty string value considered to be true
+Running
+```bash
+yq eval --null-input '"" | not'
+```
+will output
+```yaml
+false
+```
+
+## Numbers are considered to be true
+Running
+```bash
+yq eval --null-input '1 | not'
+```
+will output
+```yaml
+false
+```
+
+## Zero is considered to be true
+Running
+```bash
+yq eval --null-input '0 | not'
+```
+will output
+```yaml
+false
+```
+
+## Null is considered to be false
+Running
+```bash
+yq eval --null-input '~ | not'
+```
+will output
+```yaml
+true
+```
+

pkg/yqlib/doc/Collect into Object.md

@@ -1,7 +1,4 @@
-# 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

pkg/yqlib/doc/Comment Operators.md

@@ -1,15 +1,4 @@
-# Comment Operators
-
 Use these comment operators to set or retrieve comments.
-
-Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
-
-### plain form: `=`
-This will assign the LHS nodes comments to the expression on the RHS. The RHS is run against the matching nodes in the pipeline
-
-### relative form: `|=` 
-Similar to the plain form, however the RHS evaluates against each matching LHS node! This is useful if you want to set the comments as a relative expression of the node, for instance its value or path.
-
 ## Set line comment
 Given a sample.yml file of:
 ```yaml
@@ -24,22 +13,6 @@ will output
 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
@@ -88,23 +61,18 @@ a: cat
 b: dog # leave this
 ```
 
-## Remove (strip) all comments
-Note the use of `...` to ensure key nodes are included.
-
+## Remove all comments
 Given a sample.yml file of:
 ```yaml
 a: cat # comment
-# great
-b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq eval '.. comments=""' sample.yml
 ```
 will output
 ```yaml
 a: cat
-b:
 ```
 
 ## Get line comment
@@ -124,11 +92,7 @@ meow
 ## Get head comment
 Given a sample.yml file of:
 ```yaml
-# welcome!
-
 a: cat # meow
-
-# have a great day
 ```
 then
 ```bash
@@ -136,38 +100,13 @@ yq eval '. | headComment' sample.yml
 ```
 will output
 ```yaml
-welcome!
-```
 
-## Head comment with document split
-Given a sample.yml file of:
-```yaml
-# welcome!
----
-# bob
-a: cat # meow
-
-# have a great day
-```
-then
-```bash
-yq eval 'headComment' sample.yml
-```
-will output
-```yaml
-welcome!
-bob
 ```
 
 ## Get foot comment
 Given a sample.yml file of:
 ```yaml
-# welcome!
-
 a: cat # meow
-
-# have a great day
-# no really
 ```
 then
 ```bash
@@ -175,7 +114,6 @@ yq eval '. | footComment' sample.yml
 ```
 will output
 ```yaml
-have a great day
-no really
+
 ```
 

pkg/yqlib/doc/Delete.md

@@ -1,7 +1,4 @@
-# Delete
-
 Deletes matching entries in maps or arrays.
-
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml
@@ -98,23 +95,3 @@ will output
 b: dog
 ```
 
-## Recursively delete matching keys
-Given a sample.yml file of:
-```yaml
-a:
-  name: frog
-  b:
-    name: blog
-    age: 12
-```
-then
-```bash
-yq eval 'del(.. | select(has("name")).name)' sample.yml
-```
-will output
-```yaml
-a:
-  b:
-    age: 12
-```
-

pkg/yqlib/doc/Document Index.md

@@ -0,0 +1,54 @@
+Use the `documentIndex` operator to select nodes of a particular document.
+## Retrieve a document index
+Given a sample.yml file of:
+```yaml
+a: cat
+---
+a: frog
+```
+then
+```bash
+yq eval '.a | documentIndex' sample.yml
+```
+will output
+```yaml
+0
+---
+1
+```
+
+## Filter by document index
+Given a sample.yml file of:
+```yaml
+a: cat
+---
+a: frog
+```
+then
+```bash
+yq eval 'select(. | documentIndex == 1)' sample.yml
+```
+will output
+```yaml
+a: frog
+```
+
+## Print Document Index with matches
+Given a sample.yml file of:
+```yaml
+a: cat
+---
+a: frog
+```
+then
+```bash
+yq eval '.a | ({"match": ., "doc": (. | documentIndex)})' sample.yml
+```
+will output
+```yaml
+match: cat
+doc: 0
+match: frog
+doc: 1
+```
+

pkg/yqlib/doc/Equals.md

@@ -0,0 +1,59 @@
+This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.
+
+```
+.a == .b
+```
+
+It is most often used with the select operator to find particular nodes:
+
+```
+select(.a == .b)
+```
+
+
+## Match string
+Given a sample.yml file of:
+```yaml
+- cat
+- goat
+- dog
+```
+then
+```bash
+yq eval '.[] | (. == "*at")' sample.yml
+```
+will output
+```yaml
+true
+true
+false
+```
+
+## Match number
+Given a sample.yml file of:
+```yaml
+- 3
+- 4
+- 5
+```
+then
+```bash
+yq eval '.[] | (. == 4)' sample.yml
+```
+will output
+```yaml
+false
+true
+false
+```
+
+## Match nulls
+Running
+```bash
+yq eval --null-input 'null == ~'
+```
+will output
+```yaml
+true
+```
+

pkg/yqlib/doc/File Operators.md

@@ -1,15 +1,10 @@
-# 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`.
-
 ## Merging files
 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
+yq eval-all 'select(fileIndex == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
-
 ## Get filename
 Given a sample.yml file of:
 ```yaml
@@ -21,7 +16,7 @@ yq eval 'filename' sample.yml
 ```
 will output
 ```yaml
-sample.yml
+sample.yaml
 ```
 
 ## Get file index
@@ -38,37 +33,3 @@ will output
 0
 ```
 
-## Get file indices of multiple documents
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-And another sample another.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval-all 'fileIndex' sample.yml another.yml
-```
-will output
-```yaml
-0
----
-1
-```
-
-## Get file index alias
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval 'fi' sample.yml
-```
-will output
-```yaml
-0
-```
-

pkg/yqlib/doc/Has.md

@@ -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
@@ -22,29 +19,6 @@ true
 false
 ```
 
-## Select, checking for existence of deep paths
-Simply pipe in parent expressions into `has`
-
-Given a sample.yml file of:
-```yaml
-- a:
-    b:
-      c: cat
-- a:
-    b:
-      d: dog
-```
-then
-```bash
-yq eval '.[] | select(.a.b | has("c"))' sample.yml
-```
-will output
-```yaml
-a:
-  b:
-    c: cat
-```
-
 ## Has array index
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Length.md

@@ -1,5 +1,3 @@
-# Length
-
 Returns the lengths of the nodes. Length is defined according to the type of the node.
 
 ## String length
@@ -18,20 +16,6 @@ will output
 3
 ```
 
-## null length
-Given a sample.yml file of:
-```yaml
-a: null
-```
-then
-```bash
-yq eval '.a | length' sample.yml
-```
-will output
-```yaml
-0
-```
-
 ## Map length
 returns number of entries
 

pkg/yqlib/doc/Multiply.md

@@ -0,0 +1,238 @@
+Like the multiple operator in `jq`, depending on the operands, this multiply operator will do different things. Currently only objects are supported, which have the effect of merging the RHS into the LHS.
+
+Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).
+
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
+Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
+
+## 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
+```
+
+## 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, 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 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 does not copy 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: 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
+<<:
+  - *foo
+  - *bar
+thing: foobar_thing
+b: foobarList_b
+```
+

pkg/yqlib/doc/Path.md

@@ -1,5 +1,3 @@
-# Path
-
 The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
 
 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.
@@ -78,7 +76,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[] | select(. == "*og") | [{"path":path, "value":.}]' sample.yml
+yq eval '.a.[] | select(. == "*og") | [{"path":path, "value":.}]' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Pipe.md

@@ -1,5 +1,3 @@
-# Pipe
-
 Pipe the results of an expression into another. Like the bash operator.
 
 ## Simple Pipe

pkg/yqlib/doc/Recursive Descent.md

@@ -0,0 +1,63 @@
+This operator recursively matches 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, for instance to set the `style` of all nodes in a yaml doc:
+
+```bash
+yq eval '.. style= "flow"' file.yaml
+```
+## Aliases are not traversed
+Given a sample.yml file of:
+```yaml
+a: &cat
+  c: frog
+b: *cat
+```
+then
+```bash
+yq eval '[..]' sample.yml
+```
+will output
+```yaml
+- a: &cat
+    c: frog
+  b: *cat
+- &cat
+  c: frog
+- frog
+- *cat
+```
+
+## Merge docs are not traversed
+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 | [..]' sample.yml
+```
+will output
+```yaml
+- c: foobar_c
+  !!merge <<: *foo
+  thing: foobar_thing
+- foobar_c
+- *foo
+- foobar_thing
+```
+

pkg/yqlib/doc/Select.md

@@ -1,7 +1,4 @@
-# Select
-
 Select is used to filter arrays and maps by a boolean expression.
-
 ## Select elements from array
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Sort Keys.md

@@ -1,12 +1,10 @@
-# 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 eval -i -P 'sort_keys(..)' file1.yml
-yq eval -i -P 'sort_keys(..)' file2.yml
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
 diff file1.yml file2.yml
 ```
 
@@ -19,7 +17,7 @@ b: bing
 ```
 then
 ```bash
-yq eval 'sort_keys(.)' sample.yml
+yq eval 'sortKeys(.)' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +47,7 @@ aParent:
 ```
 then
 ```bash
-yq eval 'sort_keys(..)' sample.yml
+yq eval 'sortKeys(..)' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Style.md

@@ -1,43 +1,4 @@
-# Style
-
 The style operator can be used to get or set the style of nodes (e.g. string style, yaml style)
-
-## Update and set style of a particular node (simple)
-Given a sample.yml file of:
-```yaml
-a:
-  b: thing
-  c: something
-```
-then
-```bash
-yq eval '.a.b = "new" | .a.b style="double"' sample.yml
-```
-will output
-```yaml
-a:
-  b: "new"
-  c: something
-```
-
-## Update and set style of a particular node using path variables
-Given a sample.yml file of:
-```yaml
-a:
-  b: thing
-  c: something
-```
-then
-```bash
-yq eval 'with(.a.b ; . = "new" | . style="double")' sample.yml
-```
-will output
-```yaml
-a:
-  b: "new"
-  c: something
-```
-
 ## Set tagged style
 Given a sample.yml file of:
 ```yaml
@@ -79,26 +40,6 @@ c: "3.2"
 e: "true"
 ```
 
-## Set double quote style on map keys too
-Given a sample.yml file of:
-```yaml
-a: cat
-b: 5
-c: 3.2
-e: true
-```
-then
-```bash
-yq eval '... style="double"' sample.yml
-```
-will output
-```yaml
-"a": "cat"
-"b": "5"
-"c": "3.2"
-"e": "true"
-```
-
 ## Set single quote style
 Given a sample.yml file of:
 ```yaml
@@ -184,19 +125,19 @@ will output
 {a: cat, b: 5, c: 3.2, e: true}
 ```
 
-## Reset style - or pretty print
-Set empty (default) quote style, note the usage of `...` to match keys too. Note that there is a `--prettyPrint/-P` short flag for this.
+## Pretty print
+Set empty (default) quote style
 
 Given a sample.yml file of:
 ```yaml
 a: cat
-"b": 5
-'c': 3.2
-"e": true
+b: 5
+c: 3.2
+e: true
 ```
 then
 ```bash
-yq eval '... style=""' sample.yml
+yq eval '.. style=""' sample.yml
 ```
 will output
 ```yaml
@@ -206,22 +147,6 @@ c: 3.2
 e: true
 ```
 
-## Set style relatively with assign-update
-Given a sample.yml file of:
-```yaml
-a: single
-b: double
-```
-then
-```bash
-yq eval '.[] style |= .' sample.yml
-```
-will output
-```yaml
-a: 'single'
-b: "double"
-```
-
 ## Read style
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Tag.md

@@ -1,7 +1,4 @@
-# Tag
-
 The tag operator can be used to get or set the tag of nodes (e.g. `!!str`, `!!int`, `!!bool`).
-
 ## Get tag
 Given a sample.yml file of:
 ```yaml
@@ -25,21 +22,7 @@ will output
 !!seq
 ```
 
-## Set custom tag
-Given a sample.yml file of:
-```yaml
-a: str
-```
-then
-```bash
-yq eval '.a tag = "!!mikefarah"' sample.yml
-```
-will output
-```yaml
-a: !!mikefarah str
-```
-
-## Find numbers and convert them to strings
+## Convert numbers to strings
 Given a sample.yml file of:
 ```yaml
 a: cat

pkg/yqlib/doc/Traverse.md

@@ -1,7 +1,4 @@
-# Traverse (Read)
-
-This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structures.
-
+This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.
 ## Simple map navigation
 Given a sample.yml file of:
 ```yaml
@@ -35,23 +32,8 @@ b: apple
 c: banana
 ```
 
-## Optional Splat
-Just like splat, but won't error if you run it against scalars
-
-Given a sample.yml file of:
-```yaml
-cat
-```
-then
-```bash
-yq eval '.[]' sample.yml
-```
-will output
-```yaml
-```
-
 ## Special characters
-Use quotes with brackets around path elements with special characters
+Use quotes around path elements with special characters
 
 Given a sample.yml file of:
 ```yaml
@@ -59,63 +41,13 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.["{}"]' sample.yml
+yq eval '."{}"' sample.yml
 ```
 will output
 ```yaml
 frog
 ```
 
-## Nested special characters
-Given a sample.yml file of:
-```yaml
-a:
-  "key.withdots":
-    "another.key": apple
-```
-then
-```bash
-yq eval '.a["key.withdots"]["another.key"]' sample.yml
-```
-will output
-```yaml
-apple
-```
-
-## Keys with spaces
-Use quotes with brackets around path elements with special characters
-
-Given a sample.yml file of:
-```yaml
-"red rabbit": frog
-```
-then
-```bash
-yq eval '.["red rabbit"]' sample.yml
-```
-will output
-```yaml
-frog
-```
-
-## Dynamic keys
-Expressions within [] can be used to dynamically lookup / calculate keys
-
-Given a sample.yml file of:
-```yaml
-b: apple
-apple: crispy yum
-banana: soft yum
-```
-then
-```bash
-yq eval '.[.b]' sample.yml
-```
-will output
-```yaml
-crispy yum
-```
-
 ## Children don't exist
 Nodes are added dynamically while traversing
 
@@ -132,23 +64,6 @@ will output
 null
 ```
 
-## Optional identifier
-Like jq, does not output an error when the yaml is not an array or object as expected
-
-Given a sample.yml file of:
-```yaml
-- 1
-- 2
-- 3
-```
-then
-```bash
-yq eval '.a?' sample.yml
-```
-will output
-```yaml
-```
-
 ## Wildcard matching
 Given a sample.yml file of:
 ```yaml
@@ -191,7 +106,7 @@ b: *cat
 ```
 then
 ```bash
-yq eval '.b[]' sample.yml
+yq eval '.b.[]' sample.yml
 ```
 will output
 ```yaml
@@ -230,20 +145,6 @@ will output
 1
 ```
 
-## Traversing nested arrays by index
-Given a sample.yml file of:
-```yaml
-[[], [cat]]
-```
-then
-```bash
-yq eval '.[1][0]' sample.yml
-```
-will output
-```yaml
-cat
-```
-
 ## Maps with numeric keys
 Given a sample.yml file of:
 ```yaml
@@ -389,7 +290,7 @@ foobar:
 ```
 then
 ```bash
-yq eval '.foobar[]' sample.yml
+yq eval '.foobar.[]' sample.yml
 ```
 will output
 ```yaml
@@ -455,7 +356,7 @@ foobar:
 ```
 then
 ```bash
-yq eval '.foobarList[]' sample.yml
+yq eval '.foobarList.[]' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Union.md

@@ -1,7 +1,4 @@
-# Union
-
 This operator is used to combine different results together.
-
 ## Combine scalars
 Running
 ```bash

pkg/yqlib/doc/add.md

@@ -1,267 +0,0 @@
-# Add
-
-Add behaves differently according to the type of the LHS:
-* arrays: concatenate
-* number scalars: arithmetic addition
-* string scalars: concatenate
-
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
-
-## Concatenate and assign arrays
-Given a sample.yml file of:
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-```
-then
-```bash
-yq eval '.a.b += ["cow"]' sample.yml
-```
-will output
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-    - cow
-```
-
-## Concatenate arrays
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a + .b' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- 3
-- 4
-```
-
-## Concatenate null to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + null' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-```
-
-## Add new object to array
-Given a sample.yml file of:
-```yaml
-a:
-  - dog: woof
-```
-then
-```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
-```
-will output
-```yaml
-- dog: woof
-- cat: meow
-```
-
-## Add string to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + "hello"' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- hello
-```
-
-## Append to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
-## Append another array using +=
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a += .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
-## Relative append
-Given a sample.yml file of:
-```yaml
-a:
-  a1:
-    b:
-      - cat
-  a2:
-    b:
-      - dog
-  a3: {}
-```
-then
-```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
-```
-will output
-```yaml
-a:
-  a1:
-    b:
-      - cat
-      - mouse
-  a2:
-    b:
-      - dog
-      - mouse
-  a3: {b: [mouse]}
-```
-
-## String concatenation
-Given a sample.yml file of:
-```yaml
-a: cat
-b: meow
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: catmeow
-b: meow
-```
-
-## Number addition - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.9
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7.9
-b: 4.9
-```
-
-## Number addition - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7
-b: 4
-```
-
-## Increment numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] += 1' sample.yml
-```
-will output
-```yaml
-a: 4
-b: 6
-```
-
-## Add to null
-Adding to null simply returns the rhs
-
-Running
-```bash
-yq eval --null-input 'null + "cat"'
-```
-will output
-```yaml
-cat
-```
-

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

@@ -1,333 +0,0 @@
-# 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.
-
-
-## Merge one map
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
-- &CENTER
-  x: 1
-  y: 2
-- &LEFT
-  x: 0
-  y: 2
-- &BIG
-  r: 10
-- &SMALL
-  r: 1
-- !!merge <<: *CENTER
-  r: 10
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-x: 1
-y: 2
-r: 10
-```
-
-## Merge multiple maps
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
-- &CENTER
-  x: 1
-  y: 2
-- &LEFT
-  x: 0
-  y: 2
-- &BIG
-  r: 10
-- &SMALL
-  r: 1
-- !!merge <<:
-    - *CENTER
-    - *BIG
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-r: 10
-x: 1
-y: 2
-```
-
-## Override
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
-- &CENTER
-  x: 1
-  y: 2
-- &LEFT
-  x: 0
-  y: 2
-- &BIG
-  r: 10
-- &SMALL
-  r: 1
-- !!merge <<:
-    - *BIG
-    - *LEFT
-    - *SMALL
-  x: 1
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-r: 10
-x: 1
-y: 2
-```
-
-## Get anchor
-Given a sample.yml file of:
-```yaml
-a: &billyBob cat
-```
-then
-```bash
-yq eval '.a | anchor' sample.yml
-```
-will output
-```yaml
-billyBob
-```
-
-## Set anchor
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval '.a anchor = "foobar"' sample.yml
-```
-will output
-```yaml
-a: &foobar cat
-```
-
-## Set anchor relatively using assign-update
-Given a sample.yml file of:
-```yaml
-a:
-  b: cat
-```
-then
-```bash
-yq eval '.a anchor |= .b' sample.yml
-```
-will output
-```yaml
-a: &cat
-  b: cat
-```
-
-## Get alias
-Given a sample.yml file of:
-```yaml
-b: &billyBob meow
-a: *billyBob
-```
-then
-```bash
-yq eval '.a | alias' sample.yml
-```
-will output
-```yaml
-billyBob
-```
-
-## Set alias
-Given a sample.yml file of:
-```yaml
-b: &meow purr
-a: cat
-```
-then
-```bash
-yq eval '.a alias = "meow"' sample.yml
-```
-will output
-```yaml
-b: &meow purr
-a: *meow
-```
-
-## Set alias to blank does nothing
-Given a sample.yml file of:
-```yaml
-b: &meow purr
-a: cat
-```
-then
-```bash
-yq eval '.a alias = ""' sample.yml
-```
-will output
-```yaml
-b: &meow purr
-a: cat
-```
-
-## Set alias relatively using assign-update
-Given a sample.yml file of:
-```yaml
-b: &meow purr
-a:
-  f: meow
-```
-then
-```bash
-yq eval '.a alias |= .f' sample.yml
-```
-will output
-```yaml
-b: &meow purr
-a: *meow
-```
-
-## Explode alias and anchor
-Given a sample.yml file of:
-```yaml
-f:
-  a: &a cat
-  b: *a
-```
-then
-```bash
-yq eval 'explode(.f)' sample.yml
-```
-will output
-```yaml
-f:
-  a: cat
-  b: cat
-```
-
-## Explode with no aliases or anchors
-Given a sample.yml file of:
-```yaml
-a: mike
-```
-then
-```bash
-yq eval 'explode(.a)' sample.yml
-```
-will output
-```yaml
-a: mike
-```
-
-## Explode with alias keys
-Given a sample.yml file of:
-```yaml
-f:
-  a: &a cat
-  *a: b
-```
-then
-```bash
-yq eval 'explode(.f)' sample.yml
-```
-will output
-```yaml
-f:
-  a: cat
-  cat: b
-```
-
-## Explode 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 'explode(.)' sample.yml
-```
-will output
-```yaml
-foo:
-  a: foo_a
-  thing: foo_thing
-  c: foo_c
-bar:
-  b: bar_b
-  thing: bar_thing
-  c: bar_c
-foobarList:
-  b: bar_b
-  thing: foo_thing
-  c: foobarList_c
-  a: foo_a
-foobar:
-  c: foo_c
-  a: foo_a
-  thing: foobar_thing
-```
-
-## Dereference and update a field
-`Use explode with multiply to dereference an object
-
-Given a sample.yml file of:
-```yaml
-item_value: &item_value
-  value: true
-thingOne:
-  name: item_1
-  !!merge <<: *item_value
-thingTwo:
-  name: item_2
-  !!merge <<: *item_value
-```
-then
-```bash
-yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
-```
-will output
-```yaml
-item_value: &item_value
-  value: true
-thingOne:
-  name: item_1
-  value: false
-thingTwo:
-  name: item_2
-  !!merge <<: *item_value
-```
-

pkg/yqlib/doc/boolean-operators.md

@@ -1,222 +0,0 @@
-# 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. 
-
-`any` will return `true` if there are any `true` values in a array sequence, and `all` will return true if _all_ elements in an array are true.
-
-`any_c(condition)` and `all_c(condition)` are like `any` and `all` but they take a condition expression that is used against each element to determine if it's `true`. Note: in `jq` you can simply pass a condition to `any` or `all` and it simply works - `yq` isn't that clever..yet
-
-These are most commonly used with the `select` operator to filter particular nodes.
-
-## `or` example
-Running
-```bash
-yq eval --null-input 'true or false'
-```
-will output
-```yaml
-true
-```
-
-## `and` example
-Running
-```bash
-yq eval --null-input 'true and false'
-```
-will output
-```yaml
-false
-```
-
-## Matching nodes with select, equals and or
-Given a sample.yml file of:
-```yaml
-- a: bird
-  b: dog
-- a: frog
-  b: bird
-- a: cat
-  b: fly
-```
-then
-```bash
-yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
-```
-will output
-```yaml
-- a: bird
-  b: dog
-- a: cat
-  b: fly
-```
-
-## `any` returns true if any boolean in a given array is true
-Given a sample.yml file of:
-```yaml
-- false
-- true
-```
-then
-```bash
-yq eval 'any' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `any` returns false for an empty array
-Given a sample.yml file of:
-```yaml
-[]
-```
-then
-```bash
-yq eval 'any' sample.yml
-```
-will output
-```yaml
-false
-```
-
-## `any_c` returns true if any element in the array is true for the given condition.
-Given a sample.yml file of:
-```yaml
-a:
-  - rad
-  - awesome
-b:
-  - meh
-  - whatever
-```
-then
-```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
-```
-will output
-```yaml
-a: true
-b: false
-```
-
-## `all` returns true if all booleans in a given array are true
-Given a sample.yml file of:
-```yaml
-- true
-- true
-```
-then
-```bash
-yq eval 'all' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `all` returns true for an empty array
-Given a sample.yml file of:
-```yaml
-[]
-```
-then
-```bash
-yq eval 'all' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `all_c` returns true if all elements in the array are true for the given condition.
-Given a sample.yml file of:
-```yaml
-a:
-  - rad
-  - awesome
-b:
-  - meh
-  - 12
-```
-then
-```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
-```
-will output
-```yaml
-a: true
-b: false
-```
-
-## Not true is false
-Running
-```bash
-yq eval --null-input 'true | not'
-```
-will output
-```yaml
-false
-```
-
-## Not false is true
-Running
-```bash
-yq eval --null-input 'false | not'
-```
-will output
-```yaml
-true
-```
-
-## String values considered to be true
-Running
-```bash
-yq eval --null-input '"cat" | not'
-```
-will output
-```yaml
-false
-```
-
-## Empty string value considered to be true
-Running
-```bash
-yq eval --null-input '"" | not'
-```
-will output
-```yaml
-false
-```
-
-## Numbers are considered to be true
-Running
-```bash
-yq eval --null-input '1 | not'
-```
-will output
-```yaml
-false
-```
-
-## Zero is considered to be true
-Running
-```bash
-yq eval --null-input '0 | not'
-```
-will output
-```yaml
-false
-```
-
-## Null is considered to be false
-Running
-```bash
-yq eval --null-input '~ | not'
-```
-will output
-```yaml
-true
-```
-

pkg/yqlib/doc/contains.md

@@ -1,88 +0,0 @@
-# Contains
-
-This returns `true` if the context contains the passed in parameter, and false otherwise.
-
-## Array contains array
-Array is equal or subset of
-
-Given a sample.yml file of:
-```yaml
-- foobar
-- foobaz
-- blarp
-```
-then
-```bash
-yq eval 'contains(["baz", "bar"])' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## Object included in array
-Given a sample.yml file of:
-```yaml
-"foo": 12
-"bar":
-  - 1
-  - 2
-  - "barp": 12
-    "blip": 13
-```
-then
-```bash
-yq eval 'contains({"bar": [{"barp": 12}]})' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## Object not included in array
-Given a sample.yml file of:
-```yaml
-"foo": 12
-"bar":
-  - 1
-  - 2
-  - "barp": 12
-    "blip": 13
-```
-then
-```bash
-yq eval 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
-```
-will output
-```yaml
-false
-```
-
-## String contains substring
-Given a sample.yml file of:
-```yaml
-foobar
-```
-then
-```bash
-yq eval 'contains("bar")' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## String equals string
-Given a sample.yml file of:
-```yaml
-meow
-```
-then
-```bash
-yq eval 'contains("meow")' sample.yml
-```
-will output
-```yaml
-true
-```
-

pkg/yqlib/doc/document-index.md

@@ -1,91 +0,0 @@
-# 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
-a: cat
----
-a: frog
-```
-then
-```bash
-yq eval '.a | documentIndex' sample.yml
-```
-will output
-```yaml
-0
----
-1
-```
-
-## Retrieve a document index, shorthand
-Given a sample.yml file of:
-```yaml
-a: cat
----
-a: frog
-```
-then
-```bash
-yq eval '.a | di' sample.yml
-```
-will output
-```yaml
-0
----
-1
-```
-
-## Filter by document index
-Given a sample.yml file of:
-```yaml
-a: cat
----
-a: frog
-```
-then
-```bash
-yq eval 'select(documentIndex == 1)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
-## Filter by document index shorthand
-Given a sample.yml file of:
-```yaml
-a: cat
----
-a: frog
-```
-then
-```bash
-yq eval 'select(di == 1)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
-## Print Document Index with matches
-Given a sample.yml file of:
-```yaml
-a: cat
----
-a: frog
-```
-then
-```bash
-yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
-```
-will output
-```yaml
-match: cat
-doc: 0
-match: frog
-doc: 1
-```
-

pkg/yqlib/doc/encode-decode.md

@@ -1,273 +0,0 @@
-# Encoder / Decoder
-
-Encode operators will take the piped in object structure and encode it as a string in the desired format. The decode operators do the opposite, they take a formatted string and decode it into the relevant object structure.
-
-Note that you can optionally pass an indent value to the encode functions (see below).
-
-These operators are useful to process yaml documents that have stringified embeded yaml/json/props in them.
-
-
-| Format | Decode (from string) | Encode (to string) |
-| --- | -- | --|
-| Yaml | from_yaml | to_yaml(i)/@yaml |
-| JSON | from_json | to_json(i)/@json |
-| Properties |  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
-
-
-CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 
-
-
-## 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 json string, on one line shorthand
-Pass in a 0 indent to print json on a single line.
-
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | @json)' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: '{"cool":"thing"}'
-```
-
-## Decode a json encoded string
-Keep in mind JSON is a subset of YAML. If you want idiomatic yaml, pipe through the style operator to clear out the JSON styling.
-
-Given a sample.yml file of:
-```yaml
-a: '{"cool":"thing"}'
-```
-then
-```bash
-yq eval '.a | from_json | ... style=""' sample.yml
-```
-will output
-```yaml
-cool: thing
-```
-
-## Encode value as props string
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | @props)' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: |
-  cool = thing
-```
-
-## 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
-```
-
-## 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'
-```
-
-## Encode array of scalars as csv string
-Scalars are strings, numbers and booleans.
-
-Given a sample.yml file of:
-```yaml
-- cat
-- thing1,thing2
-- true
-- 3.40
-```
-then
-```bash
-yq eval '@csv' sample.yml
-```
-will output
-```yaml
-cat,"thing1,thing2",true,3.40
-```
-
-## Encode array of arrays as csv string
-Given a sample.yml file of:
-```yaml
-- - cat
-  - thing1,thing2
-  - true
-  - 3.40
-- - dog
-  - thing3
-  - false
-  - 12
-```
-then
-```bash
-yq eval '@csv' sample.yml
-```
-will output
-```yaml
-cat,"thing1,thing2",true,3.40
-dog,thing3,false,12
-```
-
-## Encode array of array scalars as tsv string
-Scalars are strings, numbers and booleans.
-
-Given a sample.yml file of:
-```yaml
-- - cat
-  - thing1,thing2
-  - true
-  - 3.40
-- - dog
-  - thing3
-  - false
-  - 12
-```
-then
-```bash
-yq eval '@tsv' sample.yml
-```
-will output
-```yaml
-cat	thing1,thing2	true	3.40
-dog	thing3	false	12
-```
-

pkg/yqlib/doc/entries.md

@@ -1,121 +0,0 @@
-# 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
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
-- key: a
-  value: 1
-- key: b
-  value: 2
-```
-
-## to_entries Array
-Given a sample.yml file of:
-```yaml
-- a
-- b
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
-- key: 0
-  value: a
-- key: 1
-  value: b
-```
-
-## to_entries null
-Given a sample.yml file of:
-```yaml
-null
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
-```
-
-## from_entries map
-Given a sample.yml file of:
-```yaml
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'to_entries | from_entries' sample.yml
-```
-will output
-```yaml
-a: 1
-b: 2
-```
-
-## from_entries with numeric key indexes
-from_entries always creates a map, even for numeric keys
-
-Given a sample.yml file of:
-```yaml
-- a
-- b
-```
-then
-```bash
-yq eval 'to_entries | from_entries' sample.yml
-```
-will output
-```yaml
-0: a
-1: b
-```
-
-## Use with_entries to update keys
-Given a sample.yml file of:
-```yaml
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
-```
-will output
-```yaml
-KEY_a: 1
-KEY_b: 2
-```
-
-## Use with_entries to filter the map
-Given a sample.yml file of:
-```yaml
-a:
-  b: bird
-c:
-  d: dog
-```
-then
-```bash
-yq eval 'with_entries(select(.value | has("b")))' sample.yml
-```
-will output
-```yaml
-a:
-  b: bird
-```
-

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

@@ -1,79 +0,0 @@
-# Env Variable Operators
-
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-
-## Read string environment variable
-Running
-```bash
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: cat meow
-```
-
-## Read boolean environment variable
-Running
-```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: true
-```
-
-## Read numeric environment variable
-Running
-```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: 12
-```
-
-## Read yaml environment variable
-Running
-```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: {b: fish}
-```
-
-## Read boolean environment variable as a string
-Running
-```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "true"
-```
-
-## Read numeric environment variable as a string
-Running
-```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "12"
-```
-
-## Dynamic key lookup with environment variable
-Given a sample.yml file of:
-```yaml
-cat: meow
-dog: woof
-```
-then
-```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
-```
-will output
-```yaml
-meow
-```
-

pkg/yqlib/doc/equals.md

@@ -1,124 +0,0 @@
-# Equals
-
-This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
-
-```
-.a == .b
-```
-
-It is most often used with the select operator to find particular nodes:
-
-```
-select(.a == .b)
-```
-
-## Match string
-Given a sample.yml file of:
-```yaml
-- cat
-- goat
-- dog
-```
-then
-```bash
-yq eval '.[] | (. == "*at")' sample.yml
-```
-will output
-```yaml
-true
-true
-false
-```
-
-## Don't match string
-Given a sample.yml file of:
-```yaml
-- cat
-- goat
-- dog
-```
-then
-```bash
-yq eval '.[] | (. != "*at")' sample.yml
-```
-will output
-```yaml
-false
-false
-true
-```
-
-## Match number
-Given a sample.yml file of:
-```yaml
-- 3
-- 4
-- 5
-```
-then
-```bash
-yq eval '.[] | (. == 4)' sample.yml
-```
-will output
-```yaml
-false
-true
-false
-```
-
-## Dont match number
-Given a sample.yml file of:
-```yaml
-- 3
-- 4
-- 5
-```
-then
-```bash
-yq eval '.[] | (. != 4)' sample.yml
-```
-will output
-```yaml
-true
-false
-true
-```
-
-## Match nulls
-Running
-```bash
-yq eval --null-input 'null == ~'
-```
-will output
-```yaml
-true
-```
-
-## Non exisitant key doesn't equal a value
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b != "thing")' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
-## Two non existent keys are equal
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b == .c)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-

pkg/yqlib/doc/flatten.md

@@ -1,71 +0,0 @@
-# Flatten
-This recursively flattens arrays.
-
-## Flatten
-Recursively flattens all arrays
-
-Given a sample.yml file of:
-```yaml
-- 1
-- - 2
-- - - 3
-```
-then
-```bash
-yq eval 'flatten' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- 3
-```
-
-## Flatten with depth of one
-Given a sample.yml file of:
-```yaml
-- 1
-- - 2
-- - - 3
-```
-then
-```bash
-yq eval 'flatten(1)' sample.yml
-```
-will output
-```yaml
-- 1
-- 2
-- - 3
-```
-
-## Flatten empty array
-Given a sample.yml file of:
-```yaml
-- []
-```
-then
-```bash
-yq eval 'flatten' sample.yml
-```
-will output
-```yaml
-[]
-```
-
-## Flatten array of objects
-Given a sample.yml file of:
-```yaml
-- foo: bar
-- - foo: baz
-```
-then
-```bash
-yq eval 'flatten' sample.yml
-```
-will output
-```yaml
-- foo: bar
-- foo: baz
-```
-

pkg/yqlib/doc/group-by.md

@@ -1,56 +0,0 @@
-# Group By
-
-This is used to group items in an array by an expression.
-
-## Group by field
-Given a sample.yml file of:
-```yaml
-- foo: 1
-  bar: 10
-- foo: 3
-  bar: 100
-- foo: 1
-  bar: 1
-```
-then
-```bash
-yq eval 'group_by(.foo)' sample.yml
-```
-will output
-```yaml
-- - foo: 1
-    bar: 10
-  - foo: 1
-    bar: 1
-- - foo: 3
-    bar: 100
-```
-
-## Group by field, with nuls
-Given a sample.yml file of:
-```yaml
-- cat: dog
-- foo: 1
-  bar: 10
-- foo: 3
-  bar: 100
-- no: foo for you
-- foo: 1
-  bar: 1
-```
-then
-```bash
-yq eval 'group_by(.foo)' sample.yml
-```
-will output
-```yaml
-- - cat: dog
-  - no: foo for you
-- - foo: 1
-    bar: 10
-  - foo: 1
-    bar: 1
-- - foo: 3
-    bar: 100
-```
-

pkg/yqlib/doc/headers/Add.md

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

pkg/yqlib/doc/headers/Alternative (Default value).md

@@ -1,3 +1 @@
-# Alternative (Default value)
-
 This operator is used to provide alternative (or default) values when a particular expression is either null or false.

pkg/yqlib/doc/headers/Anchor and Alias Operators.md

@@ -1,6 +1,4 @@
-# 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).
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference 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.
 

pkg/yqlib/doc/headers/Assign.md

@@ -1,5 +1,3 @@
-# Assign (Update)
-
 This operator is used to update node values. It can be used in either the:
 
 ### plain form: `=`

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

@@ -0,0 +1 @@
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.

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

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

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

@@ -0,0 +1 @@
+Use these comment operators to set or retrieve comments.

pkg/yqlib/doc/headers/Delete.md

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

pkg/yqlib/doc/headers/Document Index.md

@@ -0,0 +1 @@
+Use the `documentIndex` operator to select nodes of a particular document.