Bumping version

* enable revive linter

* enable gochecknoinits linter

* enable unconvert linter

* enable unparam linter

* enable asciicheck linter

* enable depguard linter

* enable nakedret linter

* enable megacheck linter

* enable nolintlint linter

* enable predeclared linter

* Update go.yml

* Update go.yml

.github/dependabot.yml

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

.github/workflows/go.yml

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

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.17.2'
+          go-version: '^1.17.5'
       - name: Compile man page markup
         id: gen-man-page-md
         run: |
@@ -21,7 +21,7 @@ jobs:
       - name: Get the version
         id: get_version
         run: echo ::set-output name=VERSION::${GITHUB_REF##*/}
-        
+
       - name: Generate man page
         uses: docker://pandoc/core:2.14.2
         id: gen-man-page
@@ -35,7 +35,7 @@ jobs:
             --variable=author:"Mike Farah"
             --output=yq.1
             ${{ steps.gen-man-page-md.outputs.man-page-md }}
-        
+
       - name: Cross compile
         run: |
           sudo apt-get install rhash -y
@@ -46,7 +46,7 @@ jobs:
 
       - name: Create Release
         id: create_release
-        uses: actions/create-release@v1.0.0
+        uses: actions/create-release@v1.1.4
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
@@ -67,12 +67,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:
           platforms: all
-  
+
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v1
@@ -81,16 +81,30 @@ 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=${IMAGE_V_VERSION:1}
-
-          SHORT_SHA1=$(git rev-parse --short HEAD)
           PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
+
           echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
-          echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin
-          docker buildx build --platform "${PLATFORMS}" -t "${IMAGE_NAME}:${IMAGE_VERSION}"  -t "${IMAGE_NAME}:latest" -t "${IMAGE_NAME}:4" \
-            --push .
-    
+          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
+            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
+            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
+            --label "org.opencontainers.image.title=yq" \
+            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
+            --platform "${PLATFORMS}" \
+            --pull \
+            --push \
+            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
+            -t "${IMAGE_NAME}:4" \
+            -t "${IMAGE_NAME}:latest" \
+            .

.github/workflows/test-yq.yml

@@ -11,9 +11,9 @@ jobs:
       - name: Get test
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval '.a' examples/data1.yaml
+          cmd: yq eval '.a' examples/sample.yaml
       - name: Write inplace test
         id: lookupSdkVersion
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval -i '.a.b = 5' examples/data1.yaml
+          cmd: yq eval -i '.b.c = 5' examples/sample.yaml

.golangci.yml

@@ -0,0 +1,32 @@
+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

@@ -2,29 +2,27 @@ FROM golang:1.17 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
-COPY . /go/src/mikefarah/yq
+COPY . .
 
 RUN CGO_ENABLED=0 go build .
-RUN ./scripts/test.sh
+# RUN ./scripts/test.sh -- this too often times out in the github pipeline.
 RUN ./scripts/acceptance.sh
 
 # Choose alpine as a base image to make this useful for CI, as many
 # CI tools expect an interactive shell inside the container
 FROM alpine:3 as production
-
-RUN mkdir /home/yq/
-RUN addgroup -g 1000 yq && \
-    adduser -u 1000 -G yq -s /bin/bash -h /home/yq -D yq
-RUN chown -R yq:yq /home/yq/
+LABEL maintainer="Mike Farah <mikefarah@users.noreply.github.com>"
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
-RUN chmod +x /usr/bin/yq
-
-ARG VERSION=none
-LABEL version=${VERSION}
-
-USER yq
 
 WORKDIR /workdir
 
+RUN set -eux; \
+  addgroup -g 1000 yq; \
+  adduser -u 1000 -G yq -s /bin/sh -h /home/yq -D yq
+
+RUN chown -R yq:yq /workdir
+
+USER yq
+
 ENTRYPOINT ["/usr/bin/yq"]

Makefile

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

Makefile.variables

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

README.md

@@ -5,7 +5,7 @@
 
 a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
 
-yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as docker, all listed below.
+yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker and Podman, all listed below.
 
 ## Quick Usage Guide
 
@@ -73,25 +73,11 @@ Using [Homebrew](https://brew.sh/)
 brew install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-brew install yq@3
-```
-
-Note that for v3, as it is a versioned brew it will not add the `yq` command to your path automatically. Please follow the instructions given by brew upon installation.
-
 ### Linux via snap:
 ```
 snap install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-snap install yq --channel=v3/stable
-```
-
 #### Snap notes
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:
 
@@ -110,7 +96,7 @@ sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
-### Run with Docker
+### Run with Docker or Podman
 
 #### Oneshot use:
 
@@ -118,6 +104,10 @@ 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:
@@ -126,12 +116,20 @@ You'll need to pass the `-i\--interactive` flag to docker:
 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
+```
+
 It can be useful to have a bash function to avoid typing the whole docker command:
 
 ```bash
@@ -140,17 +138,27 @@ yq() {
 }
 ```
 
+```bash
+yq() {
+  podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
+}
+```
+
 
 #### Running as root:
 
-`yq`'s docker image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the docker image, or you're having permissions issues when attempting to read/write files you'll need to either:
+`yq`'s container image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the container image, or you're having permissions issues when attempting to read/write files you'll need to either:
 
 
 ```
 docker run --user="root" -it --entrypoint sh mikefarah/yq
 ```
 
-Or, in your docker file:
+```
+podman run --user="root" -it --entrypoint sh mikefarah/yq
+```
+
+Or, in your Dockerfile:
 
 ```
 FROM mikefarah/yq
@@ -234,6 +242,7 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 - [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
 - [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
+- [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
 - [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
 - [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
 - [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
@@ -277,6 +286,6 @@ Use "yq [command] --help" for more information about a command.
 ```
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
-- Powershell has its own...opinions: https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell
+- Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
 
-See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.
+See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.

acceptance_tests/bad_args.sh

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

acceptance_tests/load-file.sh

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

cmd/evaluate_all_command.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"errors"
-	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -41,39 +40,23 @@ Note that it consumes more memory than eval.
 	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
-	}
-
-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
-		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
-	}
-
-	if writeInplace && splitFileExp != "" {
-		return fmt.Errorf("Write inplace cannot be used with split file")
-	}
-
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
@@ -87,14 +70,6 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
 	}
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-	// backwards compatibilty
-	if outputToJSON {
-		outputFormat = "json"
-	}
-
 	format, err := yqlib.OutputFormatFromString(outputFormat)
 	if err != nil {
 		return err

cmd/evalute_sequence_command.go

@@ -54,39 +54,22 @@ func processExpression(expression string) string {
 }
 
 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
-	}
-
-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
-		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
-	}
-
-	if writeInplace && splitFileExp != "" {
-		return fmt.Errorf("Write inplace cannot be used with split file")
-	}
-
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
@@ -100,11 +83,6 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
 	}
 
-	// backwards compatibilty
-	if outputToJSON {
-		outputFormat = "json"
-	}
-
 	format, err := yqlib.OutputFormatFromString(outputFormat)
 	if err != nil {
 		return err
@@ -116,10 +94,6 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
 		err = frontMatterHandler.Split()

cmd/printer_utils.go

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

cmd/utils.go

@@ -0,0 +1,63 @@
+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 = "4.13.5"
+	Version = "4.16.2"
 
 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release

examples/data1.yaml

@@ -1,5 +1,15 @@
-Resources:
-  S3Bucket:
-    Type: AWS::CloudFormation::Stack
-    Properties:
-      BucketName: !Ref MyBucketNameA
+strings:
+  - a: banana
+  - a: cat
+  - a: apple
+
+numbers:
+  - a: 12
+  - a: 13
+  - a: 120
+
+
+obj:
+  - a: {cat: "adog"}
+  - a: {cat: "doga"}
+  - a: apple

examples/data2.yaml

@@ -1,3 +1,2 @@
-#b1 
-b: 2
-#b2
+c:
+  d: hamster

examples/thing.yml

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

github-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM mikefarah/yq:4.13.5
+FROM mikefarah/yq:4
 
 COPY entrypoint.sh /entrypoint.sh
 

go.mod

@@ -2,11 +2,11 @@ module github.com/mikefarah/yq/v4
 
 require (
 	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.10.0
-	github.com/goccy/go-yaml v1.8.9
-	github.com/jinzhu/copier v0.2.8
+	github.com/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 v1.1.3
+	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
@@ -14,11 +14,11 @@ require (
 
 require (
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/mattn/go-colorable v0.1.8 // indirect
-	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/timtadh/data-structures v0.5.3 // indirect
-	golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e // indirect
+	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )
 

go.sum

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@@ -189,25 +343,46 @@ github.com/timtadh/data-structures v0.5.3 h1:F2tEjoG9qWIyUjbvXVgJqEOGJPMIiYn7U5W
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@@ -234,55 +420,200 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -290,10 +621,40 @@ google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E
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-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
@@ -326,5 +781,10 @@ gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

how-it-works.md

@@ -1,41 +1,10 @@
+# How it works
+
 In `yq` expressions are made up of operators and pipes. A context of nodes is passed through the expression and each operation takes the context as input and returns a new context as output. That output is piped in as input for the next operation in the expression. To begin with, the context is set to the first yaml document of the first yaml file (if processing in sequence using eval).
 
 Lets look at a couple of examples.
 
-## Example with a simple operator
-
-Given a document like:
-
-```yaml
-- [a]
-- "cat"
-```
-
-with an expression:
-
-```
-.[] | length
-```
-
-`yq` will initially set the context as single node of the entire yaml document, an array of two elements.
-
-```yaml
-- [a]
-- "cat"
-```
-
-This gets piped into the splat operator `.[]` which will split out the context into a collection of two nodes `[a]` and `"cat"`. Note that this is _not_ a yaml array.
-
-The `length` operator take no arguments, and will simply return the length of _each_ matching node in the context. So for the context of `[a]` and `"cat"`, it will return a new context of `1` and `3`.
-
-This being the last operation in the expression, the results will be printed out:
-
-```
-1
-3
-```
-
-# Example with an operator that takes arguments.
+## Simple assignment example
 
 Given a document like:
 
@@ -50,6 +19,8 @@ with an expression:
 .a = .b
 ```
 
+Like math 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 
@@ -58,7 +29,7 @@ It pipes the current, lets call it 'root' context through the `lhs` expression o
 cat
 ```
 
-Note that this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
+Sidenote: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
 
 The `=` operator then pipes the 'root' context through the `rhs` expression of `.b` to return the node
 
@@ -66,14 +37,58 @@ The `=` operator then pipes the 'root' context through the `rhs` expression of `
 dog
 ```
 
-Both sides have now been evaluated, so now the operator copies across the value from the RHS to the value on the LHS, and it returns the now updated context:
+Both sides have now been evaluated, so now the operator copies across the value from the RHS (`.b`) to the the LHS (`.a`), and it returns the now updated context:
 
 ```yaml
 a: dog
 b: dog
 ```
 
-# Relative update (e.g. `|=`)
+
+## Complex assignment, operator precedence rules
+
+Just like math 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.
@@ -93,7 +108,7 @@ with an expression:
 
 Similar to the `=` operator, `|=` takes two operands, the LHS and RHS.
 
-It pipes the current context (the whole document) through the LHS expression  of `.a` to get the node value:
+It pipes the current context (the whole document) through the LHS expression of `.a` to get the node value:
 
 ```
 1
@@ -111,4 +126,4 @@ The assignment operator then copies across the value from the RHS to the value o
 ```yaml
 a: 2
 b: thing
-```
+```

merge-array-by-key.sh

@@ -0,0 +1,8 @@
+#!/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

@@ -50,7 +50,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 	fileIndex := 0
 	firstFileLeadingContent := ""
 
-	var allDocuments *list.List = list.New()
+	var allDocuments = list.New()
 	for _, filename := range filenames {
 		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
 		if err != nil {
@@ -71,14 +71,15 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 
 	if allDocuments.Len() == 0 {
 		candidateNode := &CandidateNode{
-			Document:  0,
-			Filename:  "",
-			Node:      &yaml.Node{Kind: yaml.DocumentNode, HeadComment: firstFileLeadingContent, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
-			FileIndex: 0,
+			Document:       0,
+			Filename:       "",
+			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
+			FileIndex:      0,
+			LeadingContent: firstFileLeadingContent,
 		}
 		allDocuments.PushBack(candidateNode)
 	} else {
-		allDocuments.Front().Value.(*CandidateNode).Node.HeadComment = firstFileLeadingContent
+		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
 	}
 
 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)

pkg/yqlib/all_at_once_evaluator_test.go

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

pkg/yqlib/candidate_node.go

@@ -3,16 +3,21 @@ package yqlib
 import (
 	"container/list"
 	"fmt"
+	"strings"
 
 	"github.com/jinzhu/copier"
 	yaml "gopkg.in/yaml.v3"
 )
 
 type CandidateNode struct {
-	Node      *yaml.Node     // the actual node
-	Parent    *CandidateNode // parent node
-	Path      []interface{}  /// the path we took to get to this node
-	Document  uint           // the document index of this node
+	Node   *yaml.Node     // the actual node
+	Parent *CandidateNode // parent node
+	Key    *yaml.Node     // node key, if this is a value from a map (or index in an array)
+
+	LeadingContent string
+
+	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
@@ -29,17 +34,62 @@ func (n *CandidateNode) GetKey() string {
 	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
 }
 
+func (n *CandidateNode) GetNiceTag() string {
+	return unwrapDoc(n.Node).Tag
+}
+
+func (n *CandidateNode) GetNicePath() string {
+	if n.Path != nil && len(n.Path) >= 0 {
+		pathStr := make([]string, len(n.Path))
+		for i, v := range n.Path {
+			pathStr[i] = fmt.Sprintf("%v", v)
+		}
+		return strings.Join(pathStr, ".")
+	}
+	return ""
+}
+
 func (n *CandidateNode) AsList() *list.List {
 	elMap := list.New()
 	elMap.PushBack(n)
 	return elMap
 }
 
-func (n *CandidateNode) CreateChild(path interface{}, node *yaml.Node) *CandidateNode {
+func (n *CandidateNode) CreateChildInMap(key *yaml.Node, node *yaml.Node) *CandidateNode {
+	var value interface{}
+	if key != nil {
+		value = key.Value
+	}
 	return &CandidateNode{
 		Node:      node,
-		Path:      n.createChildPath(path),
+		Path:      n.createChildPath(value),
 		Parent:    n,
+		Key:       key,
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) CreateChildInArray(index int, node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(index),
+		Parent:    n,
+		Key:       &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", index), Tag: "!!int"},
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(nil),
+		Parent:    n.Parent,
+		Key:       n.Key,
+		IsMapKey:  n.IsMapKey,
 		Document:  n.Document,
 		Filename:  n.Filename,
 		FileIndex: n.FileIndex,
@@ -70,14 +120,14 @@ func (n *CandidateNode) Copy() (*CandidateNode, error) {
 }
 
 // updates this candidate from the given candidate node
-func (n *CandidateNode) UpdateFrom(other *CandidateNode) {
+func (n *CandidateNode) UpdateFrom(other *CandidateNode, prefs assignPreferences) {
 
-	n.UpdateAttributesFrom(other)
+	n.UpdateAttributesFrom(other, prefs)
 	n.Node.Content = other.Node.Content
 	n.Node.Value = other.Node.Value
 }
 
-func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
+func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignPreferences) {
 	log.Debug("UpdateAttributesFrom: n: %v other: %v", n.GetKey(), other.GetKey())
 	if n.Node.Kind != other.Node.Kind {
 		// clear out the contents when switching to a different type
@@ -88,7 +138,10 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 	n.Node.Kind = other.Node.Kind
 	n.Node.Tag = other.Node.Tag
 	n.Node.Alias = other.Node.Alias
-	n.Node.Anchor = other.Node.Anchor
+
+	if !prefs.DontOverWriteAnchor {
+		n.Node.Anchor = other.Node.Anchor
+	}
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes

pkg/yqlib/doc/Keys.md

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

pkg/yqlib/doc/add.md

@@ -1,7 +1,9 @@
+# Add
+
 Add behaves differently according to the type of the LHS:
-- arrays: concatenate
-- number scalars: arithmetic addition
-- string scalars: concatenate
+* arrays: concatenate
+* number scalars: arithmetic addition
+* string scalars: concatenate
 
 Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 

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

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

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

pkg/yqlib/doc/assign-update.md

@@ -1,4 +1,12 @@
+# Assign (Update)
 
+This operator is used to update node values. It can be used in either the:
+
+### plain form: `=`
+Which will assign the LHS node values to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.
+
+### relative form: `|=`
+This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
 ## Create yaml file
 Running
 ```bash
@@ -188,6 +196,22 @@ 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

@@ -1,3 +1,5 @@
+# Boolean Operators
+
 The `or` and `and` operators take two parameters and return a boolean result. 
 
 `not` flips a boolean from true to false, or vice versa. 

pkg/yqlib/doc/comment-operators.md

@@ -1,15 +1,15 @@
+# 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
@@ -124,7 +124,11 @@ meow
 ## Get head comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
+
 a: cat # meow
+
+# have a great day
 ```
 then
 ```bash
@@ -132,13 +136,38 @@ 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
@@ -146,6 +175,7 @@ yq eval '. | footComment' sample.yml
 ```
 will output
 ```yaml
-
+have a great day
+no really
 ```
 

pkg/yqlib/doc/contains.md

@@ -1,3 +1,6 @@
+# Contains
+
+This returns `true` if the context contains the passed in parameter, and false otherwise.
 
 ## Array contains array
 Array is equal or subset of

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

@@ -1,4 +1,7 @@
+# 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/delete.md

@@ -1,4 +1,7 @@
+# Delete
+
 Deletes matching entries in maps or arrays.
+
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/document-index.md

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

pkg/yqlib/doc/encode-decode.md

@@ -1,8 +1,116 @@
+# 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
 
@@ -49,83 +157,6 @@ b: |
           bob: dylan
 ```
 
-## Encode value as yaml string, using toyaml
-Does the same thing as to_yaml, matching jq naming convention.
-
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | to_yaml)' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: |
-  cool: thing
-```
-
-## Encode value as json string
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | to_json)' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: |
-  {
-    "cool": "thing"
-  }
-```
-
-## Encode value as json string, on one line
-Pass in a 0 indent to print json on a single line.
-
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | to_json(0))' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: '{"cool":"thing"}'
-```
-
-## Encode value as props string
-Given a sample.yml file of:
-```yaml
-a:
-  cool: thing
-```
-then
-```bash
-yq eval '.b = (.a | to_props)' sample.yml
-```
-will output
-```yaml
-a:
-  cool: thing
-b: |
-  cool = thing
-```
-
 ## Decode a yaml encoded string
 Given a sample.yml file of:
 ```yaml
@@ -175,3 +206,68 @@ will output
 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

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

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

@@ -1,5 +1,6 @@
-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.
+# 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

pkg/yqlib/doc/equals.md

@@ -1,4 +1,6 @@
-This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.
+# Equals
+
+This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
 ```
 .a == .b
@@ -10,7 +12,6 @@ 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
@@ -107,7 +108,7 @@ will output
 a: frog
 ```
 
-## Two non existant keys are equal
+## Two non existent keys are equal
 Given a sample.yml file of:
 ```yaml
 a: frog

pkg/yqlib/doc/file-operators.md

@@ -1,3 +1,5 @@
+# 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`.
@@ -7,6 +9,7 @@ Note the use of eval-all to ensure all documents are loaded into memory.
 ```bash
 yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
+
 ## Get filename
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/flatten.md

@@ -1,3 +1,4 @@
+# Flatten
 This recursively flattens arrays.
 
 ## Flatten

pkg/yqlib/doc/group-by.md

@@ -1,3 +1,5 @@
+# Group By
+
 This is used to group items in an array by an expression.
 
 ## Group by field

pkg/yqlib/doc/has.md

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

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

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

pkg/yqlib/doc/headers/Delete.md

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

pkg/yqlib/doc/headers/Encoder and Decoder.md

@@ -1,5 +0,0 @@
-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.

pkg/yqlib/doc/headers/Keys.md

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

pkg/yqlib/doc/headers/Main.md

@@ -58,4 +58,5 @@ See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
 
 # BUGS / ISSUES / FEATURE REQUESTS
 
-Please visit the GitHub page https://github.com/mikefarah/yq/.
+Please visit the GitHub page https://github.com/mikefarah/yq/.
+

pkg/yqlib/doc/headers/Union.md

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

pkg/yqlib/doc/headers/add.md

@@ -1,6 +1,8 @@
+# Add
+
 Add behaves differently according to the type of the LHS:
-- arrays: concatenate
-- number scalars: arithmetic addition
-- string scalars: concatenate
+* arrays: concatenate
+* number scalars: arithmetic addition
+* string scalars: concatenate
 
 Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.

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

@@ -1 +1,3 @@
+# 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

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

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

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

@@ -1,3 +1,5 @@
+# Boolean Operators
+
 The `or` and `and` operators take two parameters and return a boolean result. 
 
 `not` flips a boolean from true to false, or vice versa. 

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

@@ -1,11 +1,11 @@
+# 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.
-

pkg/yqlib/doc/headers/contains.md

@@ -0,0 +1,3 @@
+# Contains
+
+This returns `true` if the context contains the passed in parameter, and false otherwise.

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

@@ -0,0 +1,3 @@
+# 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.

pkg/yqlib/doc/headers/delete.md

@@ -0,0 +1,3 @@
+# Delete
+
+Deletes matching entries in maps or arrays.

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

@@ -1 +1,3 @@
-Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
+# Document Index
+
+Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.

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

@@ -0,0 +1,20 @@
+# 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). 
+

pkg/yqlib/doc/headers/entries.md

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

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

@@ -1,2 +1,3 @@
-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.
+# 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.

pkg/yqlib/doc/headers/equals.md

@@ -1,4 +1,6 @@
-This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.
+# Equals
+
+This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
 ```
 .a == .b
@@ -9,4 +11,3 @@ It is most often used with the select operator to find particular nodes:
 ```
 select(.a == .b)
 ```
-

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

@@ -1,3 +1,5 @@
+# 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`.
@@ -6,4 +8,4 @@ Note that the `fileIndex` operator has a short alias of `fi`.
 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
-```
+```

pkg/yqlib/doc/headers/flatten.md

@@ -1 +1,2 @@
+# Flatten
 This recursively flattens arrays.

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

@@ -1 +1,3 @@
+# Group By
+
 This is used to group items in an array by an expression.

pkg/yqlib/doc/headers/has.md

@@ -1 +1,3 @@
-This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
+# Has
+
+This is operation that returns true if the key exists in a map (or index in an array), false otherwise.

pkg/yqlib/doc/headers/keys.md

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

pkg/yqlib/doc/headers/length.md

@@ -1 +1,3 @@
+# Length
+
 Returns the lengths of the nodes. Length is defined according to the type of the node.

pkg/yqlib/doc/headers/load.md

@@ -0,0 +1,14 @@
+# Load
+
+The `load`/`strload` operator allows you to load in content from another file referenced in your yaml document.
+
+Note that you can use string operators like `+` and `sub` to modify the value in the yaml file to a path that exists in your system.
+
+Use `strload` to load text based content as a string block, and `load` to interpret the file as yaml.
+
+Lets say there is a file `../../examples/thing.yml`:
+
+```yaml
+a: apple is included
+b: cool
+```

pkg/yqlib/doc/headers/map.md

@@ -0,0 +1,3 @@
+# Map
+
+Maps values of an array. Use `map_values` to map values of an object.

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

@@ -1,3 +1,5 @@
+# Multiply (Merge)
+
 Like the multiple operator in jq, depending on the operands, this multiply operator will do different things. Currently numbers, arrays and objects are supported.
 
 ## Objects and arrays - merging

pkg/yqlib/doc/headers/parent.md

@@ -0,0 +1,3 @@
+# Parent
+
+Parent simply returns the parent nodes of the matching nodes.

pkg/yqlib/doc/headers/path.md

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

pkg/yqlib/doc/headers/pipe.md

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

pkg/yqlib/doc/headers/recursive-descent-glob.md

@@ -1,3 +1,5 @@
+# Recursive Descent (Glob)
+
 This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 
 
 ## match values form `..`

pkg/yqlib/doc/headers/reduce.md

@@ -1,3 +1,5 @@
+# Reduce
+
 Reduce is a powerful way to process a collection of data into a new form.
 
 ```
@@ -18,4 +20,3 @@ On the RHS there is `<init>`, the starting value of the accumulator and `<block>
 Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
 
 To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
-

pkg/yqlib/doc/headers/select.md

@@ -1 +1,3 @@
-Select is used to filter arrays and maps by a boolean expression.
+# Select
+
+Select is used to filter arrays and maps by a boolean expression.

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

@@ -1,9 +1,11 @@
+# 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 'sortKeys(..)' file1.yml
-yq eval -i 'sortKeys(..)' file2.yml
+yq eval -i -P 'sort_keys(..)' file1.yml
+yq eval -i -P 'sort_keys(..)' file2.yml
 diff file1.yml file2.yml
 ```

pkg/yqlib/doc/headers/sort.md

@@ -0,0 +1,5 @@
+# Sort
+
+Sorts an array. Use `sort` to sort an array as is, or `sort_by(exp)` to sort by a particular expression (e.g. subfield).
+
+Note that at this stage, `yq` only sorts scalar fields.

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

@@ -4,7 +4,7 @@
 This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.
 
 
-# String blocks, bash and newlines
+## String blocks, bash and newlines
 Bash is notorious for chomping on precious trailing newline characters, making it tricky to set strings with newlines properly. In particular, the `$( exp )` _will trim trailing newlines_.
 
 For instance to get this yaml:
@@ -41,4 +41,4 @@ Similarly, if you're trying to set the content from a file, and want a trailing
 ```
 IFS= read -rd '' output < <(cat my_file)
 output=$output ./yq e '.data.values = strenv(output)' first.yml
-```
+```

pkg/yqlib/doc/headers/style.md

@@ -1 +1,3 @@
-The style operator can be used to get or set the style of nodes (e.g. string style, yaml style)
+# Style
+
+The style operator can be used to get or set the style of nodes (e.g. string style, yaml style)

pkg/yqlib/doc/headers/subtract.md

@@ -0,0 +1,3 @@
+# Subtract
+
+You can use subtract to subtract numbers, as well as removing elements from an array.

pkg/yqlib/doc/headers/tag.md

@@ -1 +1,3 @@
-The tag operator can be used to get or set the tag of nodes (e.g. `!!str`, `!!int`, `!!bool`).
+# Tag
+
+The tag operator can be used to get or set the tag of nodes (e.g. `!!str`, `!!int`, `!!bool`).

pkg/yqlib/doc/headers/traverse-read.md

@@ -1 +1,3 @@
-This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structures.
+# Traverse (Read)
+
+This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structures.

pkg/yqlib/doc/headers/union.md

@@ -0,0 +1,3 @@
+# Union
+
+This operator is used to combine different results together.

pkg/yqlib/doc/headers/unique.md

@@ -1 +1,3 @@
+# Unique
+
 This is used to filter out duplicated items in an array.

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

@@ -1,3 +1,5 @@
+# Variable Operators
+
 Like the `jq` equivalents, variables are sometimes required for the more complex expressions (or swapping values between fields).
 
 Note that there is also an additional `ref` operator that holds a reference (instead of a copy) of the path, allowing you to make multiple changes to the same path.

pkg/yqlib/doc/headers/with.md

@@ -1 +1,3 @@
+# With
+
 Use the `with` operator to conveniently make multiple updates to a deeply nested path, or to update array elements relatively to each other. The first argument expression sets the root context, and the second expression runs against that root context.

pkg/yqlib/doc/keys.md

@@ -0,0 +1,114 @@
+# Keys
+
+Use the `keys` operator to return map keys or array indices. 
+
+## Map keys
+Given a sample.yml file of:
+```yaml
+dog: woof
+cat: meow
+```
+then
+```bash
+yq eval 'keys' sample.yml
+```
+will output
+```yaml
+- dog
+- cat
+```
+
+## Array keys
+Given a sample.yml file of:
+```yaml
+- apple
+- banana
+```
+then
+```bash
+yq eval 'keys' sample.yml
+```
+will output
+```yaml
+- 0
+- 1
+```
+
+## Retrieve array key
+Given a sample.yml file of:
+```yaml
+- 1
+- 2
+- 3
+```
+then
+```bash
+yq eval '.[1] | key' sample.yml
+```
+will output
+```yaml
+1
+```
+
+## Retrieve map key
+Given a sample.yml file of:
+```yaml
+a: thing
+```
+then
+```bash
+yq eval '.a | key' sample.yml
+```
+will output
+```yaml
+a
+```
+
+## No key
+Given a sample.yml file of:
+```yaml
+{}
+```
+then
+```bash
+yq eval 'key' sample.yml
+```
+will output
+```yaml
+```
+
+## Update map key
+Given a sample.yml file of:
+```yaml
+a:
+  x: 3
+  y: 4
+```
+then
+```bash
+yq eval '(.a.x | key) = "meow"' sample.yml
+```
+will output
+```yaml
+a:
+  meow: 3
+  y: 4
+```
+
+## Get comment from map key
+Given a sample.yml file of:
+```yaml
+a:
+  # comment on key
+  x: 3
+  y: 4
+```
+then
+```bash
+yq eval '.a.x | key | headComment' sample.yml
+```
+will output
+```yaml
+comment on key
+```
+

pkg/yqlib/doc/length.md

@@ -1,3 +1,5 @@
+# Length
+
 Returns the lengths of the nodes. Length is defined according to the type of the node.
 
 ## String length

pkg/yqlib/doc/load.md

@@ -0,0 +1,94 @@
+# Load
+
+The `load`/`strload` operator allows you to load in content from another file referenced in your yaml document.
+
+Note that you can use string operators like `+` and `sub` to modify the value in the yaml file to a path that exists in your system.
+
+Use `strload` to load text based content as a string block, and `load` to interpret the file as yaml.
+
+Lets say there is a file `../../examples/thing.yml`:
+
+```yaml
+a: apple is included
+b: cool
+```
+
+## Simple example
+Given a sample.yml file of:
+```yaml
+myFile: ../../examples/thing.yml
+```
+then
+```bash
+yq eval 'load(.myFile)' sample.yml
+```
+will output
+```yaml
+a: apple is included
+b: cool.
+```
+
+## Replace node with referenced file
+Note that you can modify the filename in the load operator if needed.
+
+Given a sample.yml file of:
+```yaml
+something:
+  file: thing.yml
+```
+then
+```bash
+yq eval '.something |= load("../../examples/" + .file)' sample.yml
+```
+will output
+```yaml
+something:
+  a: apple is included
+  b: cool.
+```
+
+## Replace _all_ nodes with referenced file
+Recursively match all the nodes (`..`) and then filter the ones that have a 'file' attribute. 
+
+Given a sample.yml file of:
+```yaml
+something:
+  file: thing.yml
+over:
+  here:
+    - file: thing.yml
+```
+then
+```bash
+yq eval '(.. | select(has("file"))) |= load("../../examples/" + .file)' sample.yml
+```
+will output
+```yaml
+something:
+  a: apple is included
+  b: cool.
+over:
+  here:
+    - a: apple is included
+      b: cool.
+```
+
+## Replace node with referenced file as string
+This will work for any text based file
+
+Given a sample.yml file of:
+```yaml
+something:
+  file: thing.yml
+```
+then
+```bash
+yq eval '.something |= strload("../../examples/" + .file)' sample.yml
+```
+will output
+```yaml
+something: |-
+  a: apple is included
+  b: cool.
+```
+

pkg/yqlib/doc/map.md

@@ -0,0 +1,40 @@
+# Map
+
+Maps values of an array. Use `map_values` to map values of an object.
+
+## Map array
+Given a sample.yml file of:
+```yaml
+- 1
+- 2
+- 3
+```
+then
+```bash
+yq eval 'map(. + 1)' sample.yml
+```
+will output
+```yaml
+- 2
+- 3
+- 4
+```
+
+## Map object values
+Given a sample.yml file of:
+```yaml
+a: 1
+b: 2
+c: 3
+```
+then
+```bash
+yq eval 'map_values(. + 1)' sample.yml
+```
+will output
+```yaml
+a: 2
+b: 3
+c: 4
+```
+