Updating docs

* refactor: move from io/ioutil to io and os packages

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

* build: update snapcraft `go-channel` to 1.17

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

.github/ISSUE_TEMPLATE/feature_request.md

@@ -26,7 +26,7 @@ country: Australia
 And we run a command:
 
 ```bash
-yq eval 'predictWeatherOf(.country)'
+yq 'predictWeatherOf(.country)'
 ```
 
 it could output

.github/dependabot.yml

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

.github/workflows/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 +24,9 @@ jobs:
             dep ensure
         fi
 
-    - name: Download deps
+    - name: Check the build
+      shell: bash -l {0}
       run: |
         export PATH=${PATH}:`go env GOPATH`/bin
         scripts/devtools.sh
-        make local build
+        make local build

.github/workflows/release.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 +38,18 @@ parts/
 prime/
 .snapcraft/
 yq*.snap
+
 test.yml
-test2.yml
+test*.yml
+0.yml
+1.yml
+2.yml
+
+
+# man page
+man.md
+yq.1
+
+# debian pkg
+_build
+debian/files

.golangci.yml

@@ -0,0 +1,40 @@
+run:
+  timeout: 5m
+linters:
+  enable:
+    - asciicheck
+    - depguard
+    - errorlint
+    - gci
+    - gochecknoinits
+    - gofmt
+    - goimports
+    - gosec
+    - megacheck
+    - misspell
+    - nakedret
+    - nolintlint
+    - predeclared
+    - revive
+    - unconvert
+    - unparam
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      - io/ioutil
+    packages-with-error-message:
+      - io/ioutil: "The 'io/ioutil' package is deprecated. Use corresponding 'os' or 'io' functions instead."
+issues:
+  exclude-rules:
+  - linters:
+    - gosec
+    text:  "Implicit memory aliasing in for loop."
+    path: _test\.go
+  - linters:
+    - revive
+    text: "unexported-return"
+  - linters:
+    - revive
+    text: "var-naming"

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

@@ -3,16 +3,50 @@
 ![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq)
 
 
-a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
+a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json and xml. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
 
-yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as docker, all listed below.
+yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker and Podman, all listed below.
 
-## V4 released!
-V4 is now officially released, it's quite different from V3 (sorry for the migration), however it is much more similar to ```jq```, using a similar expression syntax and therefore support much more complex functionality! 
+## Quick Usage Guide
 
-If you've been using v3 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/v/v4.x/upgrading-from-v3).
+Read a value:
+```bash
+yq '.a.b[0].c' file.yaml
+```
 
-Support for v3 will cease August 2021, until then, critical bug and security fixes will still get applied if required.
+Pipe from STDIN:
+```bash
+cat file.yaml | yq '.a.b[0].c'
+```
+
+Update a yaml file, inplace
+```bash
+yq -i '.a.b[0].c = "cool"' file.yaml
+```
+
+Update using environment variables
+```bash
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
+```
+
+Merge multiple files
+```bash
+# note the use of `ea` to evaluate all the files at once
+# instead of in sequence
+yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
+```
+
+
+Multiple updates to a yaml file
+```bash
+yq -i '
+  .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.
 
 ## Install
 
@@ -42,49 +76,54 @@ Using [Homebrew](https://brew.sh/)
 brew install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-brew install yq@3
-```
-
-Note that for v3, as it is a versioned brew it will not add the `yq` command to your path automatically. Please follow the instructions given by brew upon installation.
-
 ### Linux via snap:
 ```
 snap install yq
 ```
 
-or, for the (deprecated) v3 version:
-
-```
-snap install yq --channel=v3/stable
-```
-
 #### Snap notes
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:
 
 ```
-sudo cat /etc/myfile | yq e '.a.path' - 
+sudo cat /etc/myfile | yq '.a.path'
 ```
 
 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
-### Run with Docker
+### Run with Docker or Podman
 
 #### Oneshot use:
 
 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
+```
+
+Note that you can run `yq` in docker without network access and other privileges if you desire,
+namely `--security-opt=no-new-privileges --cap-drop all --network none`.
+
+```bash
+podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
+```
+
+#### Pipe in via STDIN:
+
+You'll need to pass the `-i\--interactive` flag to docker:
+
+```bash
+cat myfile.yml | docker run -i --rm mikefarah/yq '.this.thing'
+```
+
+```bash
+cat myfile.yml | podman run -i --rm mikefarah/yq '.this.thing'
 ```
 
 #### Run commands interactively:
@@ -93,6 +132,10 @@ docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression
 docker run --rm -it -v "${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
@@ -101,16 +144,27 @@ 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
@@ -120,6 +174,16 @@ RUN apk add bash
 USER yq
 ```
 
+### GitHub Action
+```
+  - name: Set foobar to cool
+    uses: mikefarah/yq@master
+    with:
+      cmd: yq -i '.foo.bar = "cool"' 'config.yml'
+```
+
+See https://mikefarah.gitbook.io/yq/usage/github-action for more.
+
 ### Go Get:
 ```
 GO111MODULE=on go get github.com/mikefarah/yq/v4
@@ -137,6 +201,12 @@ webi yq
 See [webi](https://webinstall.dev/)
 Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)
 
+### Arch Linux
+
+```
+pacman -S go-yq
+```
+
 ### Windows:
 [![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
 [![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
@@ -174,17 +244,21 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 ## Features
 - [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
-- Uses similar syntax as `jq` but works with YAML and JSON files
+- Uses similar syntax as `jq` but works with YAML, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
 - Fully supports multi document yaml files
 - Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
 - Colorized yaml output
-- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
-- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
+- [Deeply data structures](https://mikefarah.gitbook.io/yq/operators/traverse-read)
+- [Sort keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
 - Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
-- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
 - [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
-- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [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/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
+- [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
+- [Convert to csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
 - [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
 - [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
@@ -199,39 +273,46 @@ Usage:
   yq [flags]
   yq [command]
 
+Examples:
+
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+cat myfile.yml | yq '.stuff' # outputs the data at the "stuff" node from "myfile.yml"
+
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+
+
 Available Commands:
-  eval             Apply the expression to each document in each yaml file in sequence
+  completion       Generate the autocompletion script for the specified shell
+  eval             (default) Apply the expression to each document in each yaml file in sequence
   eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
   help             Help about any command
   shell-completion Generate completion script
 
 Flags:
-  -C, --colors                force print with colors
-  -e, --exit-status           set exit status if there are no matches or null or false is returned
-  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
-  -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.
-  -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
+  -C, --colors                        force print with colors
+  -e, --exit-status                   set exit status if there are no matches or null or false is returned
+  -f, --front-matter string           (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
+      --header-preprocess             Slurp any header comments and separators before processing expression. (default true)
+  -h, --help                          help for yq
+  -I, --indent int                    sets indent level for output (default 2)
+  -i, --inplace                       update the file inplace of first file given.
+  -p, --input-format string           [yaml|y|xml|x] parse format for input. Note that json is a subset of yaml. (default "yaml")
+  -M, --no-colors                     force print with no colors
+  -N, --no-doc                        Don't print document separators (---)
+  -n, --null-input                    Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.
+  -o, --output-format string          [yaml|y|json|j|props|p|xml|x] output format type. (default "yaml")
+  -P, --prettyPrint                   pretty print, shorthand for '... style = ""'
+  -s, --split-exp string              print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.
+      --unwrapScalar                  unwrap scalar, print the value with no quotes, colors or comments (default true)
+  -v, --verbose                       verbose mode
+  -V, --version                       Print version information and quit
+      --xml-attribute-prefix string   prefix for xml attributes (default "+")
+      --xml-content-name string       name for xml content (if no attribute name is present). (default "+content")
 
 Use "yq [command] --help" for more information about a command.
 ```
-
-Simple Example:
-
-```bash
-yq e '.a.b | length' f1.yml f2.yml 
-```
-
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
-- Powershell has its own...opinions: https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell
+- Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
 
-See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.
+See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.

acceptance_tests/bad_args.sh

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

acceptance_tests/basic.sh

@@ -1,12 +1,30 @@
 #!/bin/bash
 
 setUp() {
-  rm -f test.yml
+  rm test*.yml || true
 }
 
 testBasicEvalRoundTrip() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicEvalRoundTripNoEval() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicStdInWithOneArg() {
   ./yq e -n ".a = 123" > test.yml
-  X=$(./yq e '.a' test.yml)
+  X=$(cat test.yml | ./yq e ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ea ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ".a")
   assertEquals 123 "$X"
 }
 
@@ -19,6 +37,15 @@ EOL
   assertEquals "10" "$X"
 }
 
+testBasicUpdateInPlaceSequenceNoEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  ./yq -i ".a = 10" test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals "10" "$X"
+}
+
 testBasicUpdateInPlaceSequenceEvalAll() {
   cat >test.yml <<EOL
 a: 0
@@ -40,6 +67,12 @@ testBasicExitStatus() {
   assertEquals 1 "$?"
 }
 
+testBasicExitStatusNoEval() {
+  echo "a: cat" > test.yml
+  X=$(./yq -e '.z' test.yml 2&>/dev/null)
+  assertEquals 1 "$?"
+}
+
 testBasicExtractFieldWithSeperator() {
     cat >test.yml <<EOL
 ---

acceptance_tests/empty.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 setUp() {
+  rm test*.yml || true
   cat >test.yml <<EOL
 # comment
 EOL
@@ -8,7 +9,27 @@ EOL
 
 testEmptyEval() {
   X=$(./yq e test.yml)
+  expected=$(cat test.yml)
   assertEquals 0 $?
+  assertEquals "$expected" "$X"
+}
+
+testEmptyEvalNoNewLine() {
+  echo -n "#comment" >test.yml
+  X=$(./yq e test.yml)
+  expected=$(cat test.yml)
+  assertEquals 0 $?
+  assertEquals "$expected" "$X"
+}
+
+testEmptyEvalNoNewLineWithExpression() {
+  echo -n "# comment" >test.yml
+  X=$(./yq e '.apple = "tree"' test.yml)
+  read -r -d '' expected << EOM
+# comment
+apple: tree
+EOM
+  assertEquals "$expected" "$X"
 }
 
 testEmptyEvalPipe() {

acceptance_tests/front-matter.sh

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

acceptance_tests/inputs-format.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+}
+
+testInputXml() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +legs: "4"
+EOM
+
+  X=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2

acceptance_tests/leading-seperator.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 setUp() {
+  rm test*.yml || true
   cat >test.yml <<EOL
 ---
 a: test
@@ -36,6 +37,73 @@ testLeadingSeperatorPipeIntoEvalSeq() {
   assertEquals "$expected" "$X"
 }
 
+testLeadingSeperatorExtractField() {
+  X=$(./yq e '.a' - < test.yml)
+  assertEquals "test" "$X"
+}
+
+testLeadingSeperatorExtractFieldWithCommentsAfterSep() {
+  cat >test.yml <<EOL
+---
+# hi peeps
+# cool
+a: test
+EOL
+  X=$(./yq e '.a' test.yml)
+  assertEquals "test" "$X"
+}
+
+testLeadingSeperatorExtractFieldWithCommentsBeforeSep() {
+  cat >test.yml <<EOL
+# hi peeps
+# cool
+---
+a: test
+EOL
+  X=$(./yq e '.a' test.yml)
+  assertEquals "test" "$X"
+}
+
+
+testLeadingSeperatorExtractFieldMultiDoc() {
+  cat >test.yml <<EOL
+---
+a: test
+---
+a: test2
+EOL
+
+  read -r -d '' expected << EOM
+test
+---
+test2
+EOM
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testLeadingSeperatorExtractFieldMultiDocWithComments() {
+  cat >test.yml <<EOL
+# here
+---
+# there
+a: test
+# whereever
+---
+# you are
+a: test2
+# woop
+EOL
+
+  read -r -d '' expected << EOM
+test
+---
+test2
+EOM
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
 
 testLeadingSeperatorEvalSeq() {
   X=$(./yq e test.yml)
@@ -229,6 +297,35 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+# https://github.com/mikefarah/yq/issues/919
+testLeadingSeparatorDoesNotBreakCommentsOnOtherFiles() {
+  cat >test.yml <<EOL
+# a1
+a: 1
+# a2
+EOL
+
+cat >test2.yml <<EOL
+# b1
+b: 2
+# b2
+EOL
+
+  read -r -d '' expected << EOM
+# a1
+a: 1
+# a2
+
+# b1
+b: 2
+# b2
+EOM
+
+
+  X=$(./yq ea 'select(fi == 0) * select(fi == 1)' test.yml test2.yml)
+  assertEquals "$expected" "$X"
+}
+
 testLeadingSeperatorMultiDocEvalCommentsStripComments() {
   cat >test.yml <<EOL
 ---

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

@@ -0,0 +1,166 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+}
+
+testOutputJsonDeprecated() {
+  cat >test.yml <<EOL
+a: {b: ["cat"]}
+EOL
+
+  read -r -d '' expected << EOM
+{
+  "a": {
+    "b": [
+      "cat"
+    ]
+  }
+}
+EOM
+
+  X=$(./yq e -j test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -j test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputJson() {
+  cat >test.yml <<EOL
+a: {b: ["cat"]}
+EOL
+
+  read -r -d '' expected << EOM
+{
+  "a": {
+    "b": [
+      "cat"
+    ]
+  }
+}
+EOM
+
+  X=$(./yq e --output-format=json test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=json test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputJsonShort() {
+  cat >test.yml <<EOL
+a: {b: ["cat"]}
+EOL
+
+  read -r -d '' expected << EOM
+{
+  "a": {
+    "b": [
+      "cat"
+    ]
+  }
+}
+EOM
+
+  X=$(./yq e -o=j test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=j test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputProperties() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+a.b.c.0 = cat
+EOM
+
+  X=$(./yq e --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputPropertiesShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+a.b.c.0 = cat
+EOM
+
+  X=$(./yq e -o=p test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=p test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXml() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmlShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmComplex() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat", "dog"], +f: meow}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b f="meow">
+    <c>cat</c>
+    <c>dog</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2

acceptance_tests/pipe.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+a: frog
+EOL
+}
+
+testPipeViaCatWithParam() {
+  X=$(cat test.yml | ./yq '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEval() {
+  X=$(cat test.yml | ./yq e '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEvalAll() {
+  X=$(cat test.yml | ./yq ea '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatNoParam() {
+  X=$(cat test.yml | ./yq)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEval() {
+  X=$(cat test.yml | ./yq e)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEvalAll() {
+  X=$(cat test.yml | ./yq ea)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishWithParam() {
+  X=$(./yq '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEval() {
+  X=$(./yq e '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEvalAll() {
+  X=$(./yq ea '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishNoParam() {
+  X=$(./yq < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEval() {
+  X=$(./yq e < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEvalAll() {
+  X=$(./yq ea < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+source ./scripts/shunit2

acceptance_tests/pretty-print.sh

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

acceptance_tests/split-printer.sh

@@ -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

@@ -5,6 +5,11 @@ 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
@@ -20,4 +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/) 
@@ -40,36 +39,40 @@ Note that it consumes more memory than eval.
 	}
 	return cmdEvalAll
 }
-func evaluateAll(cmd *cobra.Command, args []string) error {
-	cmd.SilenceUsage = true
+func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
 	// 2+ args, [0] = expression, file the rest
 
 	var err error
+
+	firstFileIndex, err := initCommand(cmd, args)
+	if err != nil {
+		return err
+	}
+
 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
+
+	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
+	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
+	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
+	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
+	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
+	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
+	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
+	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
+	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
+	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
+	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
+	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
+	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
+	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
 
 	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
@@ -80,14 +83,30 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
+	format, err := yqlib.OutputFormatFromString(outputFormat)
+	if err != nil {
+		return err
 	}
 
-	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
+
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
+
+	printer := yqlib.NewPrinter(encoder, printerWriter)
 
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
@@ -98,10 +117,7 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
 
 		if frontMatter == "process" {
-			reader, err := os.Open(frontMatterHandler.GetContentFilename()) // #nosec
-			if err != nil {
-				return err
-			}
+			reader := frontMatterHandler.GetContentReader()
 			printer.SetAppendix(reader)
 			defer yqlib.SafelyCloseReader(reader)
 		}
@@ -112,7 +128,7 @@ 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
@@ -120,11 +136,15 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	case 1:
 		if nullInput {
 			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
+		} else if pipingStdIn && args[0] != "-" && !maybeFile(args[0]) {
+			// must have given a single expression and piping input from stdin
+			err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), []string{"-"}, printer, leadingContentPreProcessing, decoder)
+
 		} 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

@@ -13,7 +13,7 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "Apply the expression to each document in each yaml file in sequence",
+		Short:   "(default) Apply the expression to each document in each yaml file in sequence",
 		Example: `
 # Reads field under the given path for each file
 yq e '.a.b' f1.yml f2.yml 
@@ -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
@@ -44,44 +44,53 @@ expression and prints the result in sequence.`,
 }
 
 func processExpression(expression string) string {
+
 	if prettyPrint && expression == "" {
-		return `... style=""`
+		return yqlib.PrettyPrintExp
 	} else if prettyPrint {
-		return fmt.Sprintf("%v | ... style= \"\"", expression)
+		return fmt.Sprintf("%v | %v", expression, yqlib.PrettyPrintExp)
 	}
 	return expression
 }
 
-func evaluateSequence(cmd *cobra.Command, args []string) error {
-	cmd.SilenceUsage = true
+func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
 	// 2+ args, [0] = expression, file the rest
 
 	var err error
+	firstFileIndex, err := initCommand(cmd, args)
+	if err != nil {
+		return err
+	}
+
 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
+
+	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
+	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
+	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
+	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
+	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
+	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
+	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
+	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
+	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
+	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
+	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
+	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
+	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
+	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
+
+	// Mask for the type bits. For regular files, none will be set.
+	yqlib.GetLogger().Debug("ModeType: %v", stat.Mode()&os.ModeType)
+
+	yqlib.GetLogger().Debug("ModePerm: %v", stat.Mode()&os.ModePerm)
 
 	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
@@ -92,17 +101,33 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}
 
-	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	format, err := yqlib.OutputFormatFromString(outputFormat)
+	if err != nil {
+		return err
+	}
+
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
+
+	printer := yqlib.NewPrinter(encoder, printerWriter)
+
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
 
 	streamEvaluator := yqlib.NewStreamEvaluator()
 
-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
 		err = frontMatterHandler.Split()
@@ -112,10 +137,7 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
 
 		if frontMatter == "process" {
-			reader, err := os.Open(frontMatterHandler.GetContentFilename()) // #nosec
-			if err != nil {
-				return err
-			}
+			reader := frontMatterHandler.GetContentReader()
 			printer.SetAppendix(reader)
 			defer yqlib.SafelyCloseReader(reader)
 		}
@@ -125,7 +147,7 @@ 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
@@ -133,11 +155,14 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 	case 1:
 		if nullInput {
 			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
+		} else if pipingStdIn && args[0] != "-" && !maybeFile(args[0]) {
+			// must have given a single expression and piping input from stdin
+			err = streamEvaluator.EvaluateFiles(processExpression(args[0]), []string{"-"}, printer, leadingContentPreProcessing, decoder)
 		} 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

@@ -3,6 +3,7 @@ package cmd
 import (
 	"os"
 
+	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
 	logging "gopkg.in/op/go-logging.v1"
 )
@@ -13,13 +14,22 @@ func New() *cobra.Command {
 		Short: "yq is a lightweight and portable command-line YAML processor.",
 		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
+		Example: `
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+
+# read the "stuff" node from "myfile.yml"
+cat myfile.yml | yq '.stuff' 
+
+# update myfile.yml in place
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+`,
+
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if version {
 				cmd.Print(GetVersionDisplay())
 				return nil
 			}
-			cmd.Println(cmd.UsageString())
-			return nil
+			return evaluateSequence(cmd, args)
 
 		},
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
@@ -37,17 +47,31 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 			}
 
 			logging.SetBackend(backend)
+			yqlib.XmlPreferences.AttributePrefix = xmlAttributePrefix
+			yqlib.XmlPreferences.ContentName = xmlContentName
 		},
 	}
 
 	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose mode")
-	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "output as json. Set indent to 0 to print json in one line.")
-	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.")
+
+	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "(deprecated) output as json. Set indent to 0 to print json in one line.")
+	err := rootCmd.PersistentFlags().MarkDeprecated("tojson", "please use -o=json instead")
+	if err != nil {
+		panic(err)
+	}
+
+	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p|xml|x] output format type.")
+	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|xml|x] parse format for input. Note that json is a subset of yaml.")
+
+	rootCmd.PersistentFlags().StringVar(&xmlAttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
+	rootCmd.PersistentFlags().StringVar(&xmlContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+
+	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")
 
 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
-	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace of first yaml file given.")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file inplace of first file given.")
 	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
 	rootCmd.PersistentFlags().BoolVarP(&prettyPrint, "prettyPrint", "P", false, "pretty print, shorthand for '... style = \"\"'")
 	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")
@@ -55,7 +79,10 @@ 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.")
+
+	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 +1,103 @@
+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, error) {
+
+	var printerWriter yqlib.PrinterWriter
+
+	if splitFileExp != "" {
+		colorsEnabled = forceColor
+		splitExp, err := yqlib.NewExpressionParser().ParseExpression(splitFileExp)
+		if err != nil {
+			return nil, fmt.Errorf("bad split document expression: %w", err)
+		}
+		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
+	} else {
+		printerWriter = yqlib.NewSinglePrinterWriter(out)
+	}
+	return printerWriter, nil
+}
+
+func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
+	switch format {
+	case yqlib.JsonOutputFormat:
+		return yqlib.NewJsonEncoder(indent)
+	case yqlib.PropsOutputFormat:
+		return yqlib.NewPropertiesEncoder()
+	case yqlib.CsvOutputFormat:
+		return yqlib.NewCsvEncoder(',')
+	case yqlib.TsvOutputFormat:
+		return yqlib.NewCsvEncoder('\t')
+	case yqlib.YamlOutputFormat:
+		return yqlib.NewYamlEncoder(indent, colorsEnabled, !noDocSeparators, unwrapScalar)
+	case yqlib.XmlOutputFormat:
+		return yqlib.NewXmlEncoder(indent, xmlAttributePrefix, xmlContentName)
+	}
+	panic("invalid encoder")
+}
+
+// this is a hack to enable backwards compatibility with githubactions (which pipe /dev/null into everything)
+// and being able to call yq with the filename as a single parameter
+//
+// without this - yq detects there is stdin (thanks githubactions),
+// then tries to parse the filename as an expression
+func maybeFile(str string) bool {
+	_, err := os.Stat(str) // #nosec
+	return err == nil
+}

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.11.0"
+	Version = "4.17.2"
 
 	// 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 +1,128 @@
+yq (4.16.2) focal; urgency=medium
+
+  * Fixed with semicolon space issue
+  * Updating with documentation
+  * Added STDIN example to the top
+  * minor readme cleanup
+  * Help text tweak
+  * Fixed docker timeout - simplify docker builds
+  * New release with docker build fixes
+  * Updating to go 1.17 to fix CVE #944
+  * Fix a typo in root.go
+  * Skip the tests if the nocheck Debian build option is specified
+  * Fixed select bug (#958)
+  * Sped up explode operator
+  * Slight performance improvement to context.ChildContext
+  * Speed up multiply
+  * Update README with recently added / changed options
+  * Make deepMatch report in linear time
+  * Removed leadingContentPreProcessing flag - header preprocessing is stable
+  * Revert "Removed leadingContentPreProcessing flag - header preprocessing is stable"
+  * Keep flag, it is needed in corner cases
+  * Updated Readme
+  * Man page
+  * Fixed expression parsing bug #970
+  * Bumping go-lang, docker versions
+  * Added test release flow
+  * Updated github action release to generate man page
+  * Bumping version
+  * Removing no longer needed github action
+  * Added decoder op
+  * Fixed newline handling when decoding/encoding
+  * Fixed newline handling in encoder/decoder
+  * Can specify indent in encode ops
+  * Added group_by operator
+  * Added flatten operator
+  * Fixed flatten error message
+  * Improving docs
+  * Split printer
+  * Refactored command logic
+  * Fix JSON encoding removing null #985
+  * Fixed acceptance tests
+  * gitbook
+  * Update document generation script
+  * Updating README
+  * Updating release instructions
+  * github action no longer uses data1.yml
+  * Create dependabot.yml
+  * Bump actions/create-release from 1.0.0 to 1.1.4
+  * Bump actions/setup-go from 1 to 2.1.4
+  * Bump github.com/goccy/go-yaml from 1.8.9 to 1.9.4
+  * Bump github.com/jinzhu/copier from 0.2.8 to 0.3.2
+  * Bump github.com/fatih/color from 1.10.0 to 1.13.0
+  * Bump github.com/spf13/cobra from 1.1.3 to 1.2.1
+  * Update dependabot.yml
+  * Update go.yml
+  * add build check to PRs
+  * Include secure as part of build process
+  * Fixing bad label in github action
+  * fixed printer test
+  * remove leading content indicator
+  * Fixed header preprocessing!
+  * lint : define golangci configuration file
+  * Update check.sh
+  * Load file acceptance test
+  * Minor improvement on handling front matter
+  * Improved load doc
+  * feature: detect MANPATh and install there
+  * Update install-man-page.sh
+  * simplify prod stage, move version label to action
+  * add labels, quote some values
+  * enable errorlint linter
+  * Added errorlint to devtools
+  * Added key operator
+  * Added more tests
+  * Fixing comments
+  * Attempt to fix golint problem
+  * Include version query for tools
+  * Clean up errored file?
+  * enable misspell linter
+  * updated readme
+  * update Golangci version to v1.43.0
+  * gci linter
+  * Better merge array by key example
+  * Added credit for merge by array example
+  * Better formatting of merge arrays example
+  * Better merge example
+  * Add accessor for the yq logger instance (#1013)
+  * Fixed collect op when working with multiple nodes
+  * Added map, map_values
+  * Add support for Podman as well as Docker (#1026)
+  * Bump github.com/jinzhu/copier from 0.3.2 to 0.3.4 (#1027)
+  * Added csv, tsv output formats
+  * Added encoder tests
+  * Cleanup test
+  * Fixed docker permission issue #1014
+  * Recording release notes for next release
+  * Assignment op no longer clobbers anchor (#1029)
+  * Added sort_by operator
+  * Improved error message
+  * Improved tips and tricks
+  * Report while filename failed to parse #1030
+  * Added script for extracting checksums
+  * Improved extract-checksum.sh
+  * Bump github.com/spf13/cobra from 1.2.1 to 1.3.0 (#1039)
+  * enable more linters (#1043)
+  * Bump golang compiler #1037
+
+ -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 21 Dec 2021 09:41:44 +0000
+
+yq (4.13.0) focal; urgency=medium
+
+  * New `with` operator for making multiple changes to a given path
+  * 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/control

@@ -3,7 +3,8 @@ Section: devel
 Priority: optional
 Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Build-Depends: debhelper (>=10),
-               golang-1.15,
+               golang-1.17-go,
+               pandoc,
                rsync
 Standards-Version: 4.1.4
 Homepage: https://github.com/mikefarah/yq.git

debian/rules

@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 #
-# Copyright (C) 2018 Roberto Mier Escandón <rmescandon@gmail.com>
+# Copyright (C) 2018-2021 Roberto Mier Escandón <rmescandon@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
@@ -17,20 +17,21 @@
 PROJECT := yq
 OWNER := mikefarah
 REPO := github.com
-GOVERSION := 1.15
 
 export DH_OPTIONS
 export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
-export GOROOT := /usr/lib/go-${GOVERSION}
+export GOROOT := /usr/local/go
 export GOPATH := ${CURDIR}/_build
 export GOBIN := ${GOPATH}/bin
 export PATH := ${GOROOT}/bin:${GOBIN}:${PATH}
 export GOCACHE := /tmp/gocache
 export GOFLAGS := -mod=vendor
+export GO111MODULE := on
 
 SRCDIR := ${GOPATH}/src/${DH_GOPKG}
 DESTDIR := ${CURDIR}/debian/${PROJECT}
 BINDIR := /usr/bin
+MANDIR := /usr/share/man/man1/
 ASSETSDIR := /usr/share/${PROJECT}
 
 %:
@@ -42,16 +43,32 @@ override_dh_auto_build:
 	# copy project to local srcdir to build from there
 	rsync -avz --progress --exclude=_build --exclude=debian --exclude=tmp. --exclude=go.mod --exclude=docs . $(SRCDIR)
 	# build go code
-	(cd ${SRCDIR} && go install -buildmode=pie ./...)
+	( \
+		cd ${SRCDIR} && \
+		go install -buildmode=pie ./... \
+	)
+
+	# build man page
+	( \
+		cd ${SRCDIR} && \
+		./scripts/generate-man-page-md.sh && \
+		./scripts/generate-man-page.sh \
+	)
 	
 override_dh_auto_test:
+ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
 	(cd ${SRCDIR} && go test -v ./...)
+endif
 
 override_dh_auto_install:
 	cp ${GOBIN}/yq ${DESTDIR}/${BINDIR}
 	cp -f ${SRCDIR}/LICENSE ${DESTDIR}/${ASSETSDIR}
 	chmod a+x ${DESTDIR}/${BINDIR}/yq
 
+	# man
+	mkdir -p "${DESTDIR}"/"${MANDIR}"
+	cp "${SRCDIR}"/yq.1 "${DESTDIR}"/"${MANDIR}" \
+
 override_dh_auto_clean:
 	dh_clean
 	rm -rf ${CURDIR}/_build

examples/data1.yaml

@@ -1,4 +1 @@
----
-# hi peeps
-# cool
-a: test
+cat: purrs

examples/data2.yaml

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

examples/front-matter.yaml

@@ -2,4 +2,5 @@
 a: apple
 b: bannana
 ---
-<h1>I like {{a}} and {{b}} </h1>
+hello there
+apples: great

examples/mike.xml

@@ -0,0 +1,14 @@
+<!-- before cat -->
+<cat>
+	<!-- in cat before -->
+	<x>3<!-- multi
+line comment
+for x --></x>
+	<y>
+		<!-- in y before -->
+		<d><!-- in d before -->4<!-- in d after --></d>
+		<!-- in y after -->
+	</y>
+	<!-- in_cat_after -->
+</cat>
+<!-- after cat -->

examples/mike2.xml

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

examples/thing.yml

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

github-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM mikefarah/yq:4.11.0
+FROM mikefarah/yq:4
 
 COPY entrypoint.sh /entrypoint.sh
 

github-action/entrypoint.sh

@@ -1,6 +1,9 @@
 #!/bin/sh -l
-
+set -e
 echo "::debug::\$cmd: $1"
 RESULT=$(eval "$1")
+RESULT="${RESULT//'%'/'%25'}"
+RESULT="${RESULT//$'\n'/'%0A'}"
+RESULT="${RESULT//$'\r'/'%0D'}"
 echo "::debug::\$RESULT: $RESULT"
 echo ::set-output name=result::"$RESULT"

go.mod

@@ -1,16 +1,29 @@
 module github.com/mikefarah/yq/v4
 
 require (
+	github.com/a8m/envsubst v1.2.0
 	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.10.0
-	github.com/goccy/go-yaml v1.8.9
-	github.com/jinzhu/copier v0.2.8
-	github.com/spf13/cobra v1.1.3
-	github.com/timtadh/data-structures v0.5.3 // indirect
+	github.com/fatih/color v1.13.0
+	github.com/goccy/go-yaml v1.9.5
+	github.com/jinzhu/copier v0.3.5
+	github.com/magiconair/properties v1.8.5
+	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
+	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 +5,119 @@ 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=
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 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
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 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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@@ -288,10 +627,40 @@ google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E
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@@ -301,22 +670,116 @@ google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98
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 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
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 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/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=
@@ -324,5 +787,10 @@ 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

@@ -1,43 +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)
@@ -46,13 +46,13 @@ 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, leadingContentPreProcessing)
+		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
 		if err != nil {
 			return err
 		}
@@ -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
@@ -79,13 +136,24 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 		n.Node.Value = ""
 	}
 	n.Node.Kind = other.Node.Kind
-	n.Node.Tag = other.Node.Tag
+
+	// don't clobber custom tags...
+	if strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+		n.Node.Tag = other.Node.Tag
+	}
+
 	n.Node.Alias = other.Node.Alias
-	n.Node.Anchor = other.Node.Anchor
+
+	if !prefs.DontOverWriteAnchor {
+		n.Node.Anchor = other.Node.Anchor
+	}
 
 	// merge will pickup the style of the new thing
 	// when autocreating nodes
-	if n.Node.Style == 0 {
+	//
+	// if this is an empty map or empty array, use the style of other node.
+
+	if n.Node.Style == 0 || (n.Node.Kind != yaml.ScalarNode && len(n.Node.Content) == 0) {
 		n.Node.Style = other.Node.Style
 	}
 

pkg/yqlib/context.go

@@ -2,8 +2,10 @@ package yqlib
 
 import (
 	"container/list"
+	"fmt"
 
 	"github.com/jinzhu/copier"
+	logging "gopkg.in/op/go-logging.v1"
 )
 
 type Context struct {
@@ -41,19 +43,52 @@ func (n *Context) SetVariable(name string, value *list.List) {
 }
 
 func (n *Context) ChildContext(results *list.List) Context {
+	clone := Context{DontAutoCreate: n.DontAutoCreate}
+	clone.Variables = make(map[string]*list.List)
+	if len(n.Variables) > 0 {
+		err := copier.Copy(&clone.Variables, n.Variables)
+		if err != nil {
+			log.Error("Error cloning context :(")
+			panic(err)
+		}
+	}
+	clone.MatchingNodes = results
+	return clone
+}
+
+func (n *Context) ToString() string {
+	if !log.IsEnabledFor(logging.DEBUG) {
+		return ""
+	}
+	result := fmt.Sprintf("Context\nDontAutoCreate: %v\n", n.DontAutoCreate)
+	return result + NodesToString(n.MatchingNodes)
+}
+
+func (n *Context) DeepClone() Context {
 	clone := Context{}
 	err := copier.Copy(&clone, n)
+	// copier doesn't do lists properly for some reason
+	clone.MatchingNodes = list.New()
+	for el := n.MatchingNodes.Front(); el != nil; el = el.Next() {
+		clonedNode, err := el.Value.(*CandidateNode).Copy()
+		if err != nil {
+			log.Error("Error cloning context :(")
+			panic(err)
+		}
+		clone.MatchingNodes.PushBack(clonedNode)
+	}
+
 	if err != nil {
 		log.Error("Error cloning context :(")
 		panic(err)
 	}
-	clone.MatchingNodes = results
 	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/decoder_xml.go

@@ -0,0 +1,330 @@
+package yqlib
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"strings"
+	"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
+	contentName     string
+	finished        bool
+}
+
+func NewXmlDecoder(attributePrefix string, contentName string) Decoder {
+	if contentName == "" {
+		contentName = "content"
+	}
+	return &xmlDecoder{attributePrefix: attributePrefix, contentName: contentName, 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) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	return "#" + strings.TrimRight(c, " ")
+}
+
+func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
+	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode}
+
+	if len(n.Data) > 0 {
+		label := dec.contentName
+		labelNode := createScalarNode(label, label)
+		labelNode.HeadComment = dec.processComment(n.HeadComment)
+		labelNode.FootComment = dec.processComment(n.FootComment)
+		yamlNode.Content = append(yamlNode.Content, labelNode, createScalarNode(n.Data, n.Data))
+	}
+
+	for i, keyValuePair := range n.Children {
+		label := keyValuePair.K
+		children := keyValuePair.V
+		labelNode := createScalarNode(label, label)
+		var valueNode *yaml.Node
+		var err error
+
+		if i == 0 {
+			labelNode.HeadComment = dec.processComment(n.HeadComment)
+
+		}
+
+		// if i == len(n.Children)-1 {
+		labelNode.FootComment = dec.processComment(keyValuePair.FootComment)
+		// }
+
+		log.Debug("len of children in %v is %v", label, len(children))
+		if len(children) > 1 {
+			valueNode, err = dec.createSequence(children)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			// comment hack for maps of scalars
+			// if the value is a scalar, the head comment of the scalar needs to go on the key?
+			// add tests for <z/> as well as multiple <ds> of inputXmlWithComments > yaml
+			if len(children[0].Children) == 0 && children[0].HeadComment != "" {
+				labelNode.HeadComment = labelNode.HeadComment + "\n" + strings.TrimSpace(children[0].HeadComment)
+				children[0].HeadComment = ""
+			}
+			valueNode, err = dec.convertToYamlNode(children[0])
+			if err != nil {
+				return nil, err
+			}
+		}
+		yamlNode.Content = append(yamlNode.Content, labelNode, valueNode)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
+	if len(n.Children) > 0 {
+		return dec.createMap(n)
+	}
+	scalar := createScalarNode(n.Data, n.Data)
+	log.Debug("scalar headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	scalar.HeadComment = dec.processComment(n.HeadComment)
+	scalar.LineComment = dec.processComment(n.LineComment)
+	scalar.FootComment = dec.processComment(n.FootComment)
+
+	return scalar, nil
+}
+
+func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	root := &xmlNode{}
+	// cant use xj - it doesn't keep map order.
+	err := dec.decodeXml(root)
+
+	if err != nil {
+		return err
+	}
+	firstNode, err := dec.convertToYamlNode(root)
+
+	if err != nil {
+		return err
+	}
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{firstNode}
+	dec.finished = true
+	return nil
+}
+
+type xmlNode struct {
+	Children    []*xmlChildrenKv
+	HeadComment string
+	FootComment string
+	LineComment string
+	Data        string
+}
+
+type xmlChildrenKv struct {
+	K           string
+	V           []*xmlNode
+	FootComment string
+}
+
+// AddChild appends a node to the list of children
+func (n *xmlNode) AddChild(s string, c *xmlNode) {
+
+	if n.Children == nil {
+		n.Children = make([]*xmlChildrenKv, 0)
+	}
+	log.Debug("looking for %s", s)
+	// see if we can find an existing entry to add to
+	for _, childEntry := range n.Children {
+		if childEntry.K == s {
+			log.Debug("found it, appending an entry%s", s)
+			childEntry.V = append(childEntry.V, c)
+			log.Debug("yay len of children in %v is %v", s, len(childEntry.V))
+			return
+		}
+	}
+	log.Debug("not there, making a new one %s", s)
+	n.Children = append(n.Children, &xmlChildrenKv{K: s, V: []*xmlNode{c}})
+}
+
+type element struct {
+	parent *element
+	n      *xmlNode
+	label  string
+	state  string
+}
+
+// this code is heavily based on https://github.com/basgys/goxml2json
+// main changes are to decode into a structure that preserves the original order
+// of the map keys.
+func (dec *xmlDecoder) decodeXml(root *xmlNode) error {
+	xmlDec := xml.NewDecoder(dec.reader)
+
+	// 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:
+			log.Debug("start element %v", se.Name.Local)
+			elem.state = "started"
+			// Build new a new current element and link it to its parent
+			elem = &element{
+				parent: elem,
+				n:      &xmlNode{},
+				label:  se.Name.Local,
+			}
+
+			// Extract attributes as children
+			for _, a := range se.Attr {
+				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
+			}
+		case xml.CharData:
+			// Extract XML data (if any)
+			elem.n.Data = trimNonGraphic(string(se))
+			if elem.n.Data != "" {
+				elem.state = "chardata"
+				log.Debug("chardata [%v] for %v", elem.n.Data, elem.label)
+			}
+		case xml.EndElement:
+			log.Debug("end element %v", elem.label)
+			elem.state = "finished"
+			// And add it to its parent list
+			if elem.parent != nil {
+				elem.parent.n.AddChild(elem.label, elem.n)
+			}
+
+			// Then change the current element to its parent
+			elem = elem.parent
+		case xml.Comment:
+
+			commentStr := string(xml.CharData(se))
+			if elem.state == "started" {
+				applyFootComment(elem, commentStr)
+
+			} else if elem.state == "chardata" {
+				log.Debug("got a line comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.LineComment = joinFilter([]string{elem.n.LineComment, commentStr})
+			} else {
+				log.Debug("got a head comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.HeadComment = joinFilter([]string{elem.n.HeadComment, commentStr})
+			}
+
+		}
+	}
+
+	return nil
+}
+
+func applyFootComment(elem *element, commentStr string) {
+
+	// first lets try to put the comment on the last child
+	if len(elem.n.Children) > 0 {
+		lastChildIndex := len(elem.n.Children) - 1
+		childKv := elem.n.Children[lastChildIndex]
+		log.Debug("got a foot comment for %v: [%v]", childKv.K, commentStr)
+		childKv.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	} else {
+		log.Debug("got a foot comment for %v: [%v]", elem.label, commentStr)
+		elem.n.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	}
+}
+
+func joinFilter(rawStrings []string) string {
+	stringsToJoin := make([]string, 0)
+	for _, str := range rawStrings {
+		if str != "" {
+			stringsToJoin = append(stringsToJoin, str)
+		}
+	}
+	return strings.Join(stringsToJoin, " ")
+}
+
+// trimNonGraphic returns a slice of the string s, with all leading and trailing
+// non graphic characters and spaces removed.
+//
+// Graphic characters include letters, marks, numbers, punctuation, symbols,
+// and spaces, from categories L, M, N, P, S, Zs.
+// Spacing characters are set by category Z and property Pattern_White_Space.
+func trimNonGraphic(s string) string {
+	if s == "" {
+		return s
+	}
+
+	var first *int
+	var last int
+	for i, r := range []rune(s) {
+		if !unicode.IsGraphic(r) || unicode.IsSpace(r) {
+			continue
+		}
+
+		if first == nil {
+			f := i // copy i
+			first = &f
+			last = i
+		} else {
+			last = i
+		}
+	}
+
+	// If first is nil, it means there are no graphic characters
+	if first == nil {
+		return ""
+	}
+
+	return string([]rune(s)[*first : last+1])
+}

pkg/yqlib/decoder_yaml.go

@@ -0,0 +1,28 @@
+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/Env Variable Operators.md

@@ -1,78 +0,0 @@
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-
-
-## Read string environment variable
-Running
-```bash
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: cat meow
-```
-
-## Read boolean environment variable
-Running
-```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: true
-```
-
-## Read numeric environment variable
-Running
-```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: 12
-```
-
-## Read yaml environment variable
-Running
-```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: {b: fish}
-```
-
-## Read boolean environment variable as a string
-Running
-```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "true"
-```
-
-## Read numeric environment variable as a string
-Running
-```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "12"
-```
-
-## Dynamic key lookup with environment variable
-Given a sample.yml file of:
-```yaml
-cat: meow
-dog: woof
-```
-then
-```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
-```
-will output
-```yaml
-meow
-```
-

pkg/yqlib/doc/Keys.md

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

pkg/yqlib/doc/Select.md

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

pkg/yqlib/doc/Subtract.md

@@ -1,71 +0,0 @@
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1
-b: 4
-```
-
-## Decrement numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] -= 1' sample.yml
-```
-will output
-```yaml
-a: 2
-b: 4
-```
-

pkg/yqlib/doc/Variable Operators.md

@@ -1,58 +0,0 @@
-For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.
-
-## Single value variable
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval '.a as $foo | $foo' sample.yml
-```
-will output
-```yaml
-cat
-```
-
-## Multi value variable
-Given a sample.yml file of:
-```yaml
-- cat
-- dog
-```
-then
-```bash
-yq eval '.[] as $foo | $foo' sample.yml
-```
-will output
-```yaml
-cat
-dog
-```
-
-## Using variables as a lookup
-Example taken from [jq](https://stedolan.github.io/jq/manual/#Variable/SymbolicBindingOperator:...as$identifier|...)
-
-Given a sample.yml file of:
-```yaml
-"posts":
-  - "title": Frist psot
-    "author": anon
-  - "title": A well-written article
-    "author": person1
-"realnames":
-  "anon": Anonymous Coward
-  "person1": Person McPherson
-```
-then
-```bash
-yq eval '.realnames as $names | .posts[] | {"title":.title, "author": $names[.author]}' sample.yml
-```
-will output
-```yaml
-title: Frist psot
-author: Anonymous Coward
-title: A well-written article
-author: Person McPherson
-```
-

pkg/yqlib/doc/headers/Add.md

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

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

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

pkg/yqlib/doc/headers/Delete.md

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

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

@@ -1,2 +0,0 @@
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-

pkg/yqlib/doc/headers/Keys.md

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

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

@@ -1,4 +0,0 @@
-# String Operators
-
-## RegEx
-This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.

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

@@ -1,9 +1,13 @@
+# 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
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)
+
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
 ## Concatenate and assign arrays
 Given a sample.yml file of:
@@ -16,7 +20,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b += ["cow"]' sample.yml
+yq '.a.b += ["cow"]' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +44,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a + .b' sample.yml
+yq '.a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +63,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + null' sample.yml
+yq '.a + null' sample.yml
 ```
 will output
 ```yaml
@@ -75,7 +79,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
+yq '.a + {"cat": "meow"}' sample.yml
 ```
 will output
 ```yaml
@@ -92,7 +96,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + "hello"' sample.yml
+yq '.a + "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -113,7 +117,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -139,7 +143,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a += .b' sample.yml
+yq '.a += .b' sample.yml
 ```
 will output
 ```yaml
@@ -167,7 +171,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
+yq '.a[].b += ["mouse"]' sample.yml
 ```
 will output
 ```yaml
@@ -191,7 +195,7 @@ b: meow
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -209,7 +213,7 @@ b: 4.9
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -227,7 +231,7 @@ b: 4
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -243,7 +247,7 @@ b: 5
 ```
 then
 ```bash
-yq eval '.[] += 1' sample.yml
+yq '.[] += 1' sample.yml
 ```
 will output
 ```yaml
@@ -256,10 +260,81 @@ Adding to null simply returns the rhs
 
 Running
 ```bash
-yq eval --null-input 'null + "cat"'
+yq --null-input 'null + "cat"'
 ```
 will output
 ```yaml
 cat
 ```
 
+## Add maps to shallow merge
+Adding objects together shallow merges them. Use `*` to deeply merge.
+
+Given a sample.yml file of:
+```yaml
+a:
+  thing:
+    name: Astuff
+    value: x
+  a1: cool
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a:
+  thing:
+    name: Bstuff
+    legs: 3
+  a1: cool
+  b1: neat
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+
+## Custom types: that are really strings
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse cat
+b: !goat _meow
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse cat_meow
+b: !goat _meow
+```
+
+## Custom types: that are really numbers
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse 1.2
+b: !goat 2.3
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse 3.5
+b: !goat 2.3
+```
+

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

@@ -1,3 +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
@@ -7,7 +9,7 @@ a: bridge
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -21,7 +23,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -35,7 +37,7 @@ a: ~
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +51,7 @@ a: false
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -64,7 +66,7 @@ b: cat
 ```
 then
 ```bash
-yq eval '.a // .b' sample.yml
+yq '.a // .b' sample.yml
 ```
 will output
 ```yaml

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

@@ -1,3 +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.
@@ -23,7 +25,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -53,7 +55,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -85,7 +87,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -101,7 +103,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq eval '.a | anchor' sample.yml
+yq '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -115,7 +117,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a anchor = "foobar"' sample.yml
+yq '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -130,7 +132,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a anchor |= .b' sample.yml
+yq '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -146,7 +148,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq eval '.a | alias' sample.yml
+yq '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -161,7 +163,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = "meow"' sample.yml
+yq '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -177,7 +179,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = ""' sample.yml
+yq '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -194,7 +196,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a alias |= .f' sample.yml
+yq '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -211,7 +213,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -227,7 +229,7 @@ a: mike
 ```
 then
 ```bash
-yq eval 'explode(.a)' sample.yml
+yq 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -243,7 +245,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -276,7 +278,7 @@ foobar:
 ```
 then
 ```bash
-yq eval 'explode(.)' sample.yml
+yq 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -315,7 +317,7 @@ thingTwo:
 ```
 then
 ```bash
-yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
+yq '.thingOne |= explode(.) * {"value": false}' sample.yml
 ```
 will output
 ```yaml

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

@@ -1,8 +1,16 @@
+# 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
-yq eval --null-input '.a.b = "cat" | .x = "frog"'
+yq --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -20,7 +28,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a |= .b' sample.yml
+yq '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +45,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] |= . * 2' sample.yml
+yq '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -76,7 +84,7 @@ b: sibling
 ```
 then
 ```bash
-yq eval '.a = .b' sample.yml
+yq '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +101,7 @@ c: fieldC
 ```
 then
 ```bash
-yq eval '(.a, .c) = "potatoe"' sample.yml
+yq '(.a, .c) = "potatoe"' sample.yml
 ```
 will output
 ```yaml
@@ -110,7 +118,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b = "frog"' sample.yml
+yq '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -128,7 +136,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b |= "frog"' sample.yml
+yq '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -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:
@@ -145,7 +155,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +173,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -179,13 +189,29 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b |= "bogs"' sample.yml
+yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
 {a: {b: bogs}}
 ```
 
+## Update node value that has an anchor
+Anchor will remaple
+
+Given a sample.yml file of:
+```yaml
+a: &cool cat
+```
+then
+```bash
+yq '.a = "dog"' sample.yml
+```
+will output
+```yaml
+a: &cool dog
+```
+
 ## Update empty object and array
 Given a sample.yml file of:
 ```yaml
@@ -193,7 +219,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b.[0] |= "bogs"' sample.yml
+yq '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml

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. 
@@ -11,7 +13,7 @@ These are most commonly used with the `select` operator to filter particular nod
 ## `or` example
 Running
 ```bash
-yq eval --null-input 'true or false'
+yq --null-input 'true or false'
 ```
 will output
 ```yaml
@@ -21,7 +23,7 @@ true
 ## `and` example
 Running
 ```bash
-yq eval --null-input 'true and false'
+yq --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -40,7 +42,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
 ```
 will output
 ```yaml
@@ -58,7 +60,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -72,7 +74,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -91,7 +93,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
+yq '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -107,7 +109,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -121,7 +123,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -140,7 +142,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
+yq '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -151,7 +153,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq eval --null-input 'true | not'
+yq --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -161,7 +163,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq eval --null-input 'false | not'
+yq --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -171,7 +173,7 @@ true
 ## String values considered to be true
 Running
 ```bash
-yq eval --null-input '"cat" | not'
+yq --null-input '"cat" | not'
 ```
 will output
 ```yaml
@@ -181,7 +183,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq eval --null-input '"" | not'
+yq --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -191,7 +193,7 @@ false
 ## Numbers are considered to be true
 Running
 ```bash
-yq eval --null-input '1 | not'
+yq --null-input '1 | not'
 ```
 will output
 ```yaml
@@ -201,7 +203,7 @@ false
 ## Zero is considered to be true
 Running
 ```bash
-yq eval --null-input '0 | not'
+yq --null-input '0 | not'
 ```
 will output
 ```yaml
@@ -211,7 +213,7 @@ false
 ## Null is considered to be false
 Running
 ```bash
-yq eval --null-input '~ | not'
+yq --null-input '~ | not'
 ```
 will output
 ```yaml

pkg/yqlib/doc/operators/collect-into-array.md

@@ -6,7 +6,7 @@ This creates an array using the expression between the square brackets.
 ## Collect empty
 Running
 ```bash
-yq eval --null-input '[]'
+yq --null-input '[]'
 ```
 will output
 ```yaml
@@ -16,7 +16,7 @@ will output
 ## Collect single
 Running
 ```bash
-yq eval --null-input '["cat"]'
+yq --null-input '["cat"]'
 ```
 will output
 ```yaml
@@ -31,7 +31,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '[.a, .b]' sample.yml
+yq '[.a, .b]' sample.yml
 ```
 will output
 ```yaml

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
@@ -17,7 +17,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a lineComment="single"' sample.yml
+yq '.a lineComment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +32,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '.. lineComment |= .' sample.yml
+yq '.. lineComment |= .' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +47,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. headComment="single"' sample.yml
+yq '. headComment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -63,7 +63,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. footComment=.a' sample.yml
+yq '. footComment=.a' sample.yml
 ```
 will output
 ```yaml
@@ -80,7 +80,7 @@ b: dog # leave this
 ```
 then
 ```bash
-yq eval '.a lineComment=""' sample.yml
+yq '.a lineComment=""' sample.yml
 ```
 will output
 ```yaml
@@ -99,7 +99,7 @@ b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq '... comments=""' sample.yml
 ```
 will output
 ```yaml
@@ -114,7 +114,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '.a | lineComment' sample.yml
+yq '.a | lineComment' sample.yml
 ```
 will output
 ```yaml
@@ -124,28 +124,58 @@ meow
 ## Get head comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
+
 a: cat # meow
+
+# have a great day
 ```
 then
 ```bash
-yq eval '. | headComment' sample.yml
+yq '. | 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 '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
-yq eval '. | footComment' sample.yml
+yq '. | 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 '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 '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 '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 'contains("bar")' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## String equals string
+Given a sample.yml file of:
+```yaml
+meow
+```
+then
+```bash
+yq 'contains("meow")' sample.yml
+```
+will output
+```yaml
+true
+```
+

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

@@ -1,8 +1,11 @@
+# Create, Collect into Object
+
 This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.
+
 ## Collect empty object
 Running
 ```bash
-yq eval --null-input '{}'
+yq --null-input '{}'
 ```
 will output
 ```yaml
@@ -16,7 +19,7 @@ name: Mike
 ```
 then
 ```bash
-yq eval '{"wrap": .}' sample.yml
+yq '{"wrap": .}' sample.yml
 ```
 will output
 ```yaml
@@ -34,7 +37,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +60,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -70,7 +73,7 @@ Rosey: sheep
 ## Creating yaml from scratch
 Running
 ```bash
-yq eval --null-input '{"wrap": "frog"}'
+yq --null-input '{"wrap": "frog"}'
 ```
 will output
 ```yaml

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
@@ -7,7 +10,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.b)' sample.yml
+yq 'del(.b)' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +26,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.a.a1)' sample.yml
+yq 'del(.a.a1)' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +43,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[1])' sample.yml
+yq 'del(.[1])' sample.yml
 ```
 will output
 ```yaml
@@ -56,7 +59,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[0].a)' sample.yml
+yq 'del(.[0].a)' sample.yml
 ```
 will output
 ```yaml
@@ -71,7 +74,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.c)' sample.yml
+yq 'del(.c)' sample.yml
 ```
 will output
 ```yaml
@@ -88,7 +91,7 @@ c: bat
 ```
 then
 ```bash
-yq eval 'del( .[] | select(. == "*at") )' sample.yml
+yq 'del( .[] | select(. == "*at") )' sample.yml
 ```
 will output
 ```yaml
@@ -106,7 +109,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.. | select(has("name")).name)' sample.yml
+yq 'del(.. | select(has("name")).name)' sample.yml
 ```
 will output
 ```yaml

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

@@ -1,4 +1,7 @@
+# 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
@@ -8,7 +11,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | documentIndex' sample.yml
+yq '.a | documentIndex' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +29,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | di' sample.yml
+yq '.a | di' sample.yml
 ```
 will output
 ```yaml
@@ -44,7 +47,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(documentIndex == 1)' sample.yml
+yq 'select(documentIndex == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +63,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(di == 1)' sample.yml
+yq 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -76,7 +79,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
+yq '.a | ({"match": ., "doc": documentIndex})' sample.yml
 ```
 will output
 ```yaml

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

@@ -0,0 +1,350 @@
+# 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 | to_xml(i)/@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). 
+
+XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
+
+
+## Encode value as json string
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | to_json)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: |
+  {
+    "cool": "thing"
+  }
+```
+
+## Encode value as json string, on one line
+Pass in a 0 indent to print json on a single line.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | to_json(0))' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: '{"cool":"thing"}'
+```
+
+## Encode value as json string, on one line shorthand
+Pass in a 0 indent to print json on a single line.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | @json)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: '{"cool":"thing"}'
+```
+
+## Decode a json encoded string
+Keep in mind JSON is a subset of YAML. If you want idiomatic yaml, pipe through the style operator to clear out the JSON styling.
+
+Given a sample.yml file of:
+```yaml
+a: '{"cool":"thing"}'
+```
+then
+```bash
+yq '.a | from_json | ... style=""' sample.yml
+```
+will output
+```yaml
+cool: thing
+```
+
+## Encode value as props string
+Given a sample.yml file of:
+```yaml
+a:
+  cool: thing
+```
+then
+```bash
+yq '.b = (.a | @props)' sample.yml
+```
+will output
+```yaml
+a:
+  cool: thing
+b: |
+  cool = thing
+```
+
+## Encode value as yaml string
+Indent defaults to 2
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    bob: dylan
+```
+then
+```bash
+yq '.b = (.a | to_yaml)' sample.yml
+```
+will output
+```yaml
+a:
+  cool:
+    bob: dylan
+b: |
+  cool:
+    bob: dylan
+```
+
+## Encode value as yaml string, with custom indentation
+You can specify the indentation level as the first parameter.
+
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    bob: dylan
+```
+then
+```bash
+yq '.b = (.a | to_yaml(8))' sample.yml
+```
+will output
+```yaml
+a:
+  cool:
+    bob: dylan
+b: |
+  cool:
+          bob: dylan
+```
+
+## Decode a yaml encoded string
+Given a sample.yml file of:
+```yaml
+a: 'foo: bar'
+```
+then
+```bash
+yq '.b = (.a | from_yaml)' sample.yml
+```
+will output
+```yaml
+a: 'foo: bar'
+b:
+  foo: bar
+```
+
+## Update a multiline encoded yaml string
+Given a sample.yml file of:
+```yaml
+a: |
+  foo: bar
+  baz: dog
+
+```
+then
+```bash
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+```
+will output
+```yaml
+a: |
+  foo: cat
+  baz: dog
+```
+
+## Update a single line encoded yaml string
+Given a sample.yml file of:
+```yaml
+a: 'foo: bar'
+```
+then
+```bash
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+```
+will output
+```yaml
+a: 'foo: cat'
+```
+
+## Encode array of scalars as csv string
+Scalars are strings, numbers and booleans.
+
+Given a sample.yml file of:
+```yaml
+- cat
+- thing1,thing2
+- true
+- 3.40
+```
+then
+```bash
+yq '@csv' sample.yml
+```
+will output
+```yaml
+cat,"thing1,thing2",true,3.40
+```
+
+## Encode array of arrays as csv string
+Given a sample.yml file of:
+```yaml
+- - cat
+  - thing1,thing2
+  - true
+  - 3.40
+- - dog
+  - thing3
+  - false
+  - 12
+```
+then
+```bash
+yq '@csv' sample.yml
+```
+will output
+```yaml
+cat,"thing1,thing2",true,3.40
+dog,thing3,false,12
+```
+
+## Encode array of array scalars as tsv string
+Scalars are strings, numbers and booleans.
+
+Given a sample.yml file of:
+```yaml
+- - cat
+  - thing1,thing2
+  - true
+  - 3.40
+- - dog
+  - thing3
+  - false
+  - 12
+```
+then
+```bash
+yq '@tsv' sample.yml
+```
+will output
+```yaml
+cat	thing1,thing2	true	3.40
+dog	thing3	false	12
+```
+
+## Encode value as xml string
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | to_xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi">
+  <foo>bar</foo>
+</cool>
+
+```
+
+## Encode value as xml string on a single line
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | @xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi"><foo>bar</foo></cool>
+
+```
+
+## Encode value as xml string with custom indentation
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '{"cat": .a | to_xml(1)}' sample.yml
+```
+will output
+```yaml
+cat: |
+  <cool id="hi">
+   <foo>bar</foo>
+  </cool>
+```
+
+## Decode a xml encoded string
+Given a sample.yml file of:
+```yaml
+a: <foo>bar</foo>
+```
+then
+```bash
+yq '.b = (.a | from_xml)' sample.yml
+```
+will output
+```yaml
+a: <foo>bar</foo>
+b:
+  foo: bar
+```
+

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
@@ -7,7 +10,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -25,7 +28,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -42,7 +45,7 @@ null
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -56,7 +59,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +77,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -90,7 +93,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
+yq 'with_entries(.key |= "KEY_" + .)' sample.yml
 ```
 will output
 ```yaml
@@ -108,7 +111,7 @@ c:
 ```
 then
 ```bash
-yq eval 'with_entries(select(.value | has("b")))' sample.yml
+yq 'with_entries(select(.value | has("b")))' sample.yml
 ```
 will output
 ```yaml

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

@@ -0,0 +1,138 @@
+# Env Variable Operators
+
+These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
+
+There are three operators:
+-  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
+- `strenv` which also takes a single environment variable name, and always parses the variable as a string.
+- `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
+
+
+## Tip
+To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
+as follows:
+
+```bash
+yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
+```
+
+
+## Read string environment variable
+Running
+```bash
+myenv="cat meow" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: cat meow
+```
+
+## Read boolean environment variable
+Running
+```bash
+myenv="true" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: true
+```
+
+## Read numeric environment variable
+Running
+```bash
+myenv="12" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: 12
+```
+
+## Read yaml environment variable
+Running
+```bash
+myenv="{b: fish}" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: {b: fish}
+```
+
+## Read boolean environment variable as a string
+Running
+```bash
+myenv="true" yq --null-input '.a = strenv(myenv)'
+```
+will output
+```yaml
+a: "true"
+```
+
+## Read numeric environment variable as a string
+Running
+```bash
+myenv="12" yq --null-input '.a = strenv(myenv)'
+```
+will output
+```yaml
+a: "12"
+```
+
+## Dynamic key lookup with environment variable
+Given a sample.yml file of:
+```yaml
+cat: meow
+dog: woof
+```
+then
+```bash
+myenv="cat" yq '.[env(myenv)]' sample.yml
+```
+will output
+```yaml
+meow
+```
+
+## Replace strings with envsubst
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenv} meows" | envsubst'
+```
+will output
+```yaml
+the cat meows
+```
+
+## Replace strings with envsubst, missing variables
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
+```
+will output
+```yaml
+the  meows
+```
+
+## Replace strings with envsubst, missing variables with defaults
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
+```
+will output
+```yaml
+the dog meows
+```
+
+## Replace string environment variable in document
+Given a sample.yml file of:
+```yaml
+v: ${myenv}
+```
+then
+```bash
+myenv="cat meow" yq '.v |= envsubst' sample.yml
+```
+will output
+```yaml
+v: cat meow
+```
+

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
@@ -20,7 +21,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == "*at")' sample.yml
+yq '.[] | (. == "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -38,7 +39,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != "*at")' sample.yml
+yq '.[] | (. != "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -56,7 +57,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == 4)' sample.yml
+yq '.[] | (. == 4)' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +75,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != 4)' sample.yml
+yq '.[] | (. != 4)' sample.yml
 ```
 will output
 ```yaml
@@ -86,7 +87,7 @@ true
 ## Match nulls
 Running
 ```bash
-yq eval --null-input 'null == ~'
+yq --null-input 'null == ~'
 ```
 will output
 ```yaml
@@ -100,21 +101,21 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(.b != "thing")' sample.yml
+yq 'select(.b != "thing")' sample.yml
 ```
 will output
 ```yaml
 a: frog
 ```
 
-## Two non existant keys are equal
+## Two non existent keys are equal
 Given a sample.yml file of:
 ```yaml
 a: frog
 ```
 then
 ```bash
-yq eval 'select(.b == .c)' sample.yml
+yq 'select(.b == .c)' sample.yml
 ```
 will output
 ```yaml

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
@@ -14,7 +17,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'filename' sample.yml
+yq 'filename' sample.yml
 ```
 will output
 ```yaml
@@ -28,7 +31,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fileIndex' sample.yml
+yq 'fileIndex' sample.yml
 ```
 will output
 ```yaml
@@ -62,7 +65,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fi' sample.yml
+yq 'fi' sample.yml
 ```
 will output
 ```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 '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 'flatten(1)' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- - 3
+```
+
+## Flatten empty array
+Given a sample.yml file of:
+```yaml
+- []
+```
+then
+```bash
+yq 'flatten' sample.yml
+```
+will output
+```yaml
+[]
+```
+
+## Flatten array of objects
+Given a sample.yml file of:
+```yaml
+- foo: bar
+- - foo: baz
+```
+then
+```bash
+yq '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 '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 '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
@@ -9,7 +12,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has("a")' sample.yml
+yq '.[] | has("a")' sample.yml
 ```
 will output
 ```yaml
@@ -33,7 +36,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(.a.b | has("c"))' sample.yml
+yq '.[] | select(.a.b | has("c"))' sample.yml
 ```
 will output
 ```yaml
@@ -54,7 +57,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has(1)' sample.yml
+yq '.[] | has(1)' sample.yml
 ```
 will output
 ```yaml

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

@@ -0,0 +1,63 @@
+# NAME
+  *yq* is a portable command-line YAML processor
+
+# SYNOPSIS 
+
+yq [eval/eval-all] [expression] files..
+
+eval/e  - (default) 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 '.a.b[0].c' file.yaml
+```
+
+## Pipe from STDIN:
+```bash
+cat file.yaml | yq '.a.b[0].c'
+```
+
+## Update a yaml file, inplace
+```bash
+yq -i '.a.b[0].c = "cool"' file.yaml
+```
+
+## Update using environment variables
+```bash
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
+```
+
+## Merge multiple files
+```
+yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
+```
+Note the use of `ea` to evaluate all files at once (instead of in sequence.)
+
+## Multiple updates to a yaml file
+```bash
+yq -i '
+  .a.b[0].c = "cool" |
+  .x.y.z = "foobar" |
+  .person.name = strenv(NAME)
+' file.yaml
+```
+
+See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+
+# 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

@@ -0,0 +1,10 @@
+# Add
+
+Add behaves differently according to the type of the LHS:
+* arrays: concatenate
+* number scalars: arithmetic addition
+* string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)
+
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+

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 +1,23 @@
+# 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 | to_xml(i)/@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). 
+
+XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
+

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

@@ -0,0 +1,18 @@
+# Env Variable Operators
+
+These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
+
+There are three operators:
+-  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
+- `strenv` which also takes a single environment variable name, and always parses the variable as a string.
+- `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
+
+
+## Tip
+To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
+as follows:
+
+```bash
+yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
+```
+

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
-```
+```