Fin.

* 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

@@ -11,16 +11,42 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15'
+          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 }}
+
       - name: Cross compile
         run: |
           sudo apt-get install rhash -y
           go get github.com/mitchellh/gox
+          mkdir -p build
+          cp yq.1 build/yq.1
           ./scripts/xcompile.sh
 
       - name: Create Release
         id: create_release
-        uses: actions/create-release@v1.0.0
+        uses: actions/create-release@v1.1.4
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
@@ -41,12 +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
@@ -55,16 +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

.gitignore

@@ -38,5 +38,14 @@ parts/
 prime/
 .snapcraft/
 yq*.snap
+
 test.yml
-test2.yml
+test*.yml
+0.yml
+1.yml
+2.yml
+
+
+# man page
+man.md
+yq.1

.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

@@ -1,32 +1,28 @@
-FROM golang:1.15 as builder
+FROM golang:1.17 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
-# cache devtools
-COPY ./scripts/devtools.sh /go/src/mikefarah/yq/scripts/devtools.sh
-RUN ./scripts/devtools.sh
+COPY . .
 
-COPY . /go/src/mikefarah/yq
-
-RUN CGO_ENABLED=0 make local build
+RUN CGO_ENABLED=0 go build .
+# 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:3.13.5 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/
+FROM alpine:3 as production
+LABEL maintainer="Mike Farah <mikefarah@users.noreply.github.com>"
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
-RUN chmod +x /usr/bin/yq
-
-ARG VERSION=none
-LABEL version=${VERSION}
-
-USER yq
 
 WORKDIR /workdir
 
+RUN set -eux; \
+  addgroup -g 1000 yq; \
+  adduser -u 1000 -G yq -s /bin/sh -h /home/yq -D yq
+
+RUN chown -R yq:yq /workdir
+
+USER yq
+
 ENTRYPOINT ["/usr/bin/yq"]

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.15
+FROM golang:1.17
 
 COPY scripts/devtools.sh /opt/devtools.sh
 

LICENSE

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

Makefile

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

Makefile.variables

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

README.md

@@ -5,16 +5,20 @@
 
 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
 
 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
@@ -69,25 +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:
 
@@ -106,7 +96,7 @@ sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
-### Run with Docker
+### Run with Docker or Podman
 
 #### Oneshot use:
 
@@ -114,6 +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:
@@ -122,12 +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
@@ -136,17 +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
@@ -230,6 +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)
@@ -256,14 +269,15 @@ 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 = ""'
-  -j, --tojson                output as json. Set indent to 0 to print json in one line.
       --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
@@ -272,6 +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/basic.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 setUp() {
-  rm -f test.yml
+  rm test*.yml || true
 }
 
 testBasicEvalRoundTrip() {

acceptance_tests/empty.sh

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

acceptance_tests/front-matter.sh

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

acceptance_tests/leading-seperator.sh

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

acceptance_tests/load-file.sh

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

acceptance_tests/output-format.sh

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

acceptance_tests/pretty-print.sh

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

acceptance_tests/split-printer.sh

@@ -0,0 +1,157 @@
+#!/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

cmd/constant.go

@@ -6,6 +6,10 @@ var unwrapScalar = true
 var writeInplace = false
 var outputToJSON = false
 var outputFormat = "yaml"
+var inputFormat = "yaml"
+
+var xmlAttributePrefix = "+"
+var xmlContentName = "+content"
 
 var exitStatus = false
 var forceColor = false
@@ -21,4 +25,6 @@ var prettyPrint = false
 // can be either "" (off), "extract" or "process"
 var frontMatter = ""
 
+var splitFileExp = ""
+
 var completedSuccessfully = false

cmd/evaluate_all_command.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"errors"
-	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -24,8 +23,8 @@ 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 ...
 
-# Read from STDIN
-## use '-' as a filename to read from STDIN
+# 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/) 
@@ -41,35 +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 {
 		// only use colors if its forced
 		colorsEnabled = forceColor
@@ -83,20 +70,19 @@ 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
 	}
 
-	printer := yqlib.NewPrinter(out, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	decoder, err := configureDecoder()
+	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])
@@ -118,7 +104,7 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
@@ -127,10 +113,10 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		if nullInput {
 			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
 		} else {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
+			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
 		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
 	}
 
 	completedSuccessfully = err == nil

cmd/evalute_sequence_command.go

@@ -21,8 +21,8 @@ yq e '.a.b' f1.yml f2.yml
 # Prints out the file
 yq e sample.yaml 
 
-# Read from STDIN
-## use '-' as a filename to read from STDIN
+# 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
@@ -54,35 +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 {
 		// only use colors if its forced
 		colorsEnabled = forceColor
@@ -96,24 +83,22 @@ 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
 	}
 
-	printer := yqlib.NewPrinter(out, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printerWriter := configurePrinterWriter(format, out)
+
+	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
 
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
 		err = frontMatterHandler.Split()
@@ -133,7 +118,7 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing, decoder)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
@@ -142,10 +127,10 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		if nullInput {
 			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
 		} else {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
+			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing, decoder)
 		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing, decoder)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -49,6 +49,11 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 	}
 
 	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p] output format type.")
+	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|xml|x] input format type.")
+
+	rootCmd.PersistentFlags().StringVar(&xmlAttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
+	rootCmd.PersistentFlags().StringVar(&xmlContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+
 	rootCmd.PersistentFlags().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 (---)")
 
@@ -62,7 +67,10 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 	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 seperators before processing expression. This is a workaround for go-yaml to persist header content. This flag will be removed once this feature has been out in the wild for a while.")
+	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

@@ -0,0 +1,75 @@
+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 configureDecoder() (yqlib.Decoder, error) {
+	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
+	if err != nil {
+		return nil, err
+	}
+	switch yqlibInputFormat {
+	case yqlib.XmlInputFormat:
+		return yqlib.NewXmlDecoder(xmlAttributePrefix, xmlContentName), nil
+	}
+	return yqlib.NewYamlDecoder(), 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 = "4.12.2"
+	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

debian/changelog

@@ -1,3 +1,19 @@
+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

debian/rules

@@ -45,7 +45,9 @@ 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

@@ -1,3 +1,15 @@
-# a1
-a: 1
-# a2
+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/mike.xml

@@ -0,0 +1,4 @@
+  <?xml version="1.0" encoding="UTF-8"?>
+  <cat>3f</cat>
+  <dog>meow:as</dog>
+  <dog3>true</dog3>

examples/mike2.xml

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

examples/thing.yml

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

github-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM mikefarah/yq:4.12.2
+FROM mikefarah/yq:4
 
 COPY entrypoint.sh /entrypoint.sh
 

github-action/entrypoint.sh

@@ -2,5 +2,8 @@
 set -e
 echo "::debug::\$cmd: $1"
 RESULT=$(eval "$1")
+RESULT="${RESULT//'%'/'%25'}"
+RESULT="${RESULT//$'\n'/'%0A'}"
+RESULT="${RESULT//$'\r'/'%0D'}"
 echo "::debug::\$RESULT: $RESULT"
 echo ::set-output name=result::"$RESULT"

go.mod

@@ -2,16 +2,26 @@ 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/timtadh/data-structures v0.5.3 // indirect
+	github.com/spf13/cobra v1.3.0
 	github.com/timtadh/lexmachine v0.2.2
-	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
-go 1.15
+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/timtadh/data-structures v0.5.3 // indirect
+	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)
+
+go 1.17

go.sum

@@ -5,46 +5,117 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
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@@ -303,22 +666,116 @@ google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98
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how-it-works.md

@@ -1,43 +1,10 @@
-# Operators
+# 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:
 
@@ -52,6 +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 
@@ -60,7 +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
 
@@ -68,14 +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.
@@ -95,7 +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
@@ -113,4 +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

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

pkg/yqlib/all_at_once_evaluator_test.go

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

pkg/yqlib/candidate_node.go

@@ -1,17 +1,23 @@
 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
@@ -28,11 +34,62 @@ func (n *CandidateNode) GetKey() string {
 	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
 }
 
-func (n *CandidateNode) CreateChild(path interface{}, node *yaml.Node) *CandidateNode {
+func (n *CandidateNode) GetNiceTag() string {
+	return unwrapDoc(n.Node).Tag
+}
+
+func (n *CandidateNode) GetNicePath() string {
+	if n.Path != nil && len(n.Path) >= 0 {
+		pathStr := make([]string, len(n.Path))
+		for i, v := range n.Path {
+			pathStr[i] = fmt.Sprintf("%v", v)
+		}
+		return strings.Join(pathStr, ".")
+	}
+	return ""
+}
+
+func (n *CandidateNode) AsList() *list.List {
+	elMap := list.New()
+	elMap.PushBack(n)
+	return elMap
+}
+
+func (n *CandidateNode) CreateChildInMap(key *yaml.Node, node *yaml.Node) *CandidateNode {
+	var value interface{}
+	if key != nil {
+		value = key.Value
+	}
 	return &CandidateNode{
 		Node:      node,
-		Path:      n.createChildPath(path),
+		Path:      n.createChildPath(value),
 		Parent:    n,
+		Key:       key,
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) CreateChildInArray(index int, node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(index),
+		Parent:    n,
+		Key:       &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", index), Tag: "!!int"},
+		Document:  n.Document,
+		Filename:  n.Filename,
+		FileIndex: n.FileIndex,
+	}
+}
+
+func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
+	return &CandidateNode{
+		Node:      node,
+		Path:      n.createChildPath(nil),
+		Parent:    n.Parent,
+		Key:       n.Key,
+		IsMapKey:  n.IsMapKey,
 		Document:  n.Document,
 		Filename:  n.Filename,
 		FileIndex: n.FileIndex,
@@ -63,14 +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
@@ -81,7 +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/context.go

@@ -43,11 +43,14 @@ func (n *Context) SetVariable(name string, value *list.List) {
 }
 
 func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
+	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
@@ -61,9 +64,31 @@ func (n *Context) ToString() string {
 	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)

pkg/yqlib/decode_xml_test.go

@@ -0,0 +1,110 @@
+package yqlib
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+	yaml "gopkg.in/yaml.v3"
+)
+
+func decodeXml(t *testing.T, xml string) *CandidateNode {
+	decoder := NewXmlDecoder("+", "+content")
+
+	decoder.Init(strings.NewReader(xml))
+
+	node := &yaml.Node{}
+	err := decoder.Decode(node)
+	if err != nil {
+		t.Error(err, "fail to decode", xml)
+	}
+	return &CandidateNode{Node: node}
+}
+
+type xmlScenario struct {
+	inputXml       string
+	expected       string
+	description    string
+	subdescription string
+	skipDoc        bool
+}
+
+var xmlScenarios = []xmlScenario{
+	{
+		description: "Parse xml: simple",
+		inputXml:    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat>meow</cat>",
+		expected:    "D0, P[], (doc)::cat: meow\n",
+	},
+	{
+		description:    "Parse xml: array",
+		subdescription: "Consecutive nodes with identical xml names are assumed to be arrays.",
+		inputXml:       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<animal>1</animal>\n<animal>2</animal>",
+		expected:       "D0, P[], (doc)::animal:\n    - \"1\"\n    - \"2\"\n",
+	},
+	{
+		description:    "Parse xml: attributes",
+		subdescription: "Attributes are converted to fields, with the attribute prefix.",
+		inputXml:       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat legs=\"4\">\n  <legs>7</legs>\n</cat>",
+		expected:       "D0, P[], (doc)::cat:\n    +legs: \"4\"\n    legs: \"7\"\n",
+	},
+	{
+		description:    "Parse xml: attributes with content",
+		subdescription: "Content is added as a field, using the content name",
+		inputXml:       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat legs=\"4\">meow</cat>",
+		expected:       "D0, P[], (doc)::cat:\n    +content: meow\n    +legs: \"4\"\n",
+	},
+}
+
+func testXmlScenario(t *testing.T, s *xmlScenario) {
+	var actual = resultToString(t, decodeXml(t, s.inputXml))
+	test.AssertResult(t, s.expected, actual)
+}
+
+func documentXmlScenario(t *testing.T, w *bufio.Writer, i interface{}) {
+	s := i.(xmlScenario)
+
+	if s.skipDoc {
+		return
+	}
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.xml file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```xml\n%v\n```\n", s.inputXml))
+
+	writeOrPanic(w, "then\n")
+	writeOrPanic(w, "```bash\nyq e sample.xml\n```\n")
+	writeOrPanic(w, "will output\n")
+
+	var output bytes.Buffer
+	printer := NewPrinterWithSingleWriter(bufio.NewWriter(&output), YamlOutputFormat, true, false, 2, true)
+
+	node := decodeXml(t, s.inputXml)
+
+	err := printer.PrintResults(node.AsList())
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n", output.String()))
+
+}
+
+func TestXmlScenarios(t *testing.T) {
+	for _, tt := range xmlScenarios {
+		testXmlScenario(t, &tt)
+	}
+	genericScenarios := make([]interface{}, len(xmlScenarios))
+	for i, s := range xmlScenarios {
+		genericScenarios[i] = s
+	}
+	documentScenarios(t, "usage", "xml", genericScenarios, documentXmlScenario)
+}

pkg/yqlib/decoder_xml.go

@@ -0,0 +1,249 @@
+package yqlib
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"unicode"
+
+	"golang.org/x/net/html/charset"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type InputFormat uint
+
+const (
+	YamlInputFormat = 1 << iota
+	XmlInputFormat
+)
+
+func InputFormatFromString(format string) (InputFormat, error) {
+	switch format {
+	case "yaml", "y":
+		return YamlInputFormat, nil
+	case "xml", "x":
+		return XmlInputFormat, nil
+	default:
+		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml]", format)
+	}
+}
+
+type xmlDecoder struct {
+	reader          io.Reader
+	attributePrefix string
+	contentPrefix   string
+	finished        bool
+}
+
+func NewXmlDecoder(attributePrefix string, contentPrefix string) Decoder {
+	if contentPrefix == "" {
+		contentPrefix = "content"
+	}
+	return &xmlDecoder{attributePrefix: attributePrefix, contentPrefix: contentPrefix, finished: false}
+}
+
+func (dec *xmlDecoder) Init(reader io.Reader) {
+	dec.reader = reader
+	dec.finished = false
+}
+
+func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
+	yamlNode := &yaml.Node{Kind: yaml.SequenceNode}
+	for _, child := range nodes {
+		yamlChild, err := dec.convertToYamlNode(child)
+		if err != nil {
+			return nil, err
+		}
+		yamlNode.Content = append(yamlNode.Content, yamlChild)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode, HeadComment: n.Comment}
+
+	if len(n.Data) > 0 {
+		label := dec.contentPrefix
+		yamlNode.Content = append(yamlNode.Content, createScalarNode(label, label), createScalarNode(n.Data, n.Data))
+	}
+
+	for _, keyValuePair := range n.Children {
+		label := keyValuePair.K
+		children := keyValuePair.V
+		labelNode := createScalarNode(label, label)
+		var valueNode *yaml.Node
+		var err error
+		log.Debug("len of children in %v is %v", label, len(children))
+		if len(children) > 1 {
+			valueNode, err = dec.createSequence(children)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			valueNode, err = dec.convertToYamlNode(children[0])
+			if err != nil {
+				return nil, err
+			}
+		}
+		yamlNode.Content = append(yamlNode.Content, labelNode, valueNode)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
+	if len(n.Children) > 0 {
+		return dec.createMap(n)
+	}
+	scalar := createScalarNode(n.Data, n.Data)
+	scalar.HeadComment = n.Comment
+	return scalar, nil
+}
+
+func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	root := &xmlNode{}
+	// cant use xj - it doesn't keep map order.
+	err := dec.decodeXml(root)
+
+	if err != nil {
+		return err
+	}
+	firstNode, err := dec.convertToYamlNode(root)
+
+	if err != nil {
+		return err
+	}
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{firstNode}
+	dec.finished = true
+	return nil
+}
+
+type xmlNode struct {
+	Children []*xmlChildrenKv
+	Comment  string
+	Data     string
+}
+
+type xmlChildrenKv struct {
+	K string
+	V []*xmlNode
+}
+
+// AddChild appends a node to the list of children
+func (n *xmlNode) AddChild(s string, c *xmlNode) {
+
+	if n.Children == nil {
+		n.Children = make([]*xmlChildrenKv, 0)
+	}
+	log.Debug("looking for %s", s)
+	// see if we can find an existing entry to add to
+	for _, childEntry := range n.Children {
+		if childEntry.K == s {
+			log.Debug("found it, appending an entry%s", s)
+			childEntry.V = append(childEntry.V, c)
+			log.Debug("yay len of children in %v is %v", s, len(childEntry.V))
+			return
+		}
+	}
+	log.Debug("not there, making a new one %s", s)
+	n.Children = append(n.Children, &xmlChildrenKv{K: s, V: []*xmlNode{c}})
+}
+
+type element struct {
+	parent *element
+	n      *xmlNode
+	label  string
+}
+
+// this code is heavily based on https://github.com/basgys/goxml2json
+// main changes are to decode into a structure that preserves the original order
+// of the map keys.
+func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
+	xmlDec := xml.NewDecoder(dec.reader)
+
+	// That will convert the charset if the provided XML is non-UTF-8
+	xmlDec.CharsetReader = charset.NewReaderLabel
+
+	// Create first element from the root node
+	elem := &element{
+		parent: nil,
+		n:      root,
+	}
+
+	for {
+		t, _ := xmlDec.Token()
+		if t == nil {
+			break
+		}
+
+		switch se := t.(type) {
+		case xml.StartElement:
+			// Build new a new current element and link it to its parent
+			elem = &element{
+				parent: elem,
+				n:      &xmlNode{},
+				label:  se.Name.Local,
+			}
+
+			// Extract attributes as children
+			for _, a := range se.Attr {
+				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
+			}
+		case xml.CharData:
+			// Extract XML data (if any)
+			elem.n.Data = trimNonGraphic(string(se))
+		case xml.EndElement:
+			// And add it to its parent list
+			if elem.parent != nil {
+				elem.parent.n.AddChild(elem.label, elem.n)
+			}
+
+			// Then change the current element to its parent
+			elem = elem.parent
+		case xml.Comment:
+			elem.n.Comment = trimNonGraphic(string(xml.CharData(se)))
+		}
+	}
+
+	return nil
+}
+
+// trimNonGraphic returns a slice of the string s, with all leading and trailing
+// non graphic characters and spaces removed.
+//
+// Graphic characters include letters, marks, numbers, punctuation, symbols,
+// and spaces, from categories L, M, N, P, S, Zs.
+// Spacing characters are set by category Z and property Pattern_White_Space.
+func trimNonGraphic(s string) string {
+	if s == "" {
+		return s
+	}
+
+	var first *int
+	var last int
+	for i, r := range []rune(s) {
+		if !unicode.IsGraphic(r) || unicode.IsSpace(r) {
+			continue
+		}
+
+		if first == nil {
+			f := i // copy i
+			first = &f
+			last = i
+		} else {
+			last = i
+		}
+	}
+
+	// If first is nil, it means there are no graphic characters
+	if first == nil {
+		return ""
+	}
+
+	return string([]rune(s)[*first : last+1])
+}

pkg/yqlib/decoder_yaml.go

@@ -0,0 +1,28 @@
+package yqlib
+
+import (
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type Decoder interface {
+	Init(reader io.Reader)
+	Decode(node *yaml.Node) error
+}
+
+type yamlDecoder struct {
+	decoder yaml.Decoder
+}
+
+func NewYamlDecoder() Decoder {
+	return &yamlDecoder{}
+}
+
+func (dec *yamlDecoder) Init(reader io.Reader) {
+	dec.decoder = *yaml.NewDecoder(reader)
+}
+
+func (dec *yamlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	return dec.decoder.Decode(rootYamlNode)
+}

pkg/yqlib/doc/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/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/Keys.md

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

pkg/yqlib/doc/headers/Union.md

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

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

@@ -1 +0,0 @@
-For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.

pkg/yqlib/doc/operators/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/operators/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/operators/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/operators/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
@@ -136,7 +144,9 @@ a:
   b: frog
 ```
 
-## Update selected results
+## 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.
+
 Given a sample.yml file of:
 ```yaml
 a:
@@ -186,6 +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/operators/boolean-operators.md

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

pkg/yqlib/doc/operators/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/operators/contains.md

@@ -0,0 +1,88 @@
+# 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/operators/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/operators/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/operators/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/operators/encode-decode.md

@@ -0,0 +1,289 @@
+# 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
+```
+
+## Decode a xml encoded string
+Given a sample.yml file of:
+```yaml
+a: <foo>bar</foo>
+```
+then
+```bash
+yq eval '.b = (.a | from_xml)' sample.yml
+```
+will output
+```yaml
+a: <foo>bar</foo>
+b:
+  foo: bar
+```
+

pkg/yqlib/doc/operators/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/operators/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/operators/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/operators/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/operators/flatten.md

@@ -0,0 +1,71 @@
+# 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/operators/group-by.md

@@ -0,0 +1,56 @@
+# 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/operators/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/operators/headers/Main.md

@@ -0,0 +1,62 @@
+# NAME
+  *yq* is a portable command-line YAML processor
+
+# SYNOPSIS 
+
+yq [eval/eval-all] [expression] files..
+
+eval/e  - Apply the expression to each document in each yaml file in sequence
+
+eval-all/ea - Loads all yaml documents of all yaml files and runs expression once
+
+# DESCRIPTION
+
+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.
+
+This documentation is also available at https://mikefarah.gitbook.io/yq/
+# QUICK GUIDE 
+
+## 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.
+
+# 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
+
+# BUGS / ISSUES / FEATURE REQUESTS
+
+Please visit the GitHub page https://github.com/mikefarah/yq/.
+

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

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

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

@@ -0,0 +1,21 @@
+# 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 |
+| XML | from_xml |  |
+
+
+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/operators/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/operators/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/operators/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/operators/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/operators/headers/flatten.md

@@ -0,0 +1,2 @@
+# Flatten
+This recursively flattens arrays.

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

@@ -0,0 +1,3 @@
+# Group By
+
+This is used to group items in an array by an expression.

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

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

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

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

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

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