Bumping version

Bumps [github.com/goccy/go-yaml](https://github.com/goccy/go-yaml) from 1.11.1 to 1.11.2.
- [Release notes](https://github.com/goccy/go-yaml/releases)
- [Changelog](https://github.com/goccy/go-yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/goccy/go-yaml/compare/v1.11.1...v1.11.2)

---
updated-dependencies:
- dependency-name: github.com/goccy/go-yaml
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/codeql.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/docker-release.yml

@@ -14,16 +14,16 @@ jobs:
       IMAGE_NAME: mikefarah/yq
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
         with:
           platforms: all
 
       - name: Set up Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         with:
           version: latest
 
@@ -60,3 +60,23 @@ jobs:
             -t "${IMAGE_NAME}:4" \
             -t "${IMAGE_NAME}:latest" \
             .
+          
+          cd github-action
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
+            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
+            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
+            --label "org.opencontainers.image.title=yq" \
+            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
+            --platform "${PLATFORMS}" \
+            --pull \
+            --push \
+            -t "${IMAGE_NAME}:${IMAGE_VERSION}-githubaction" \
+            -t "${IMAGE_NAME}:4-githubaction" \
+            -t "${IMAGE_NAME}:latest-githubaction" \
+            .

.github/workflows/go.yml

@@ -10,14 +10,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.18
-      uses: actions/setup-go@v3
+    - name: Set up Go
+      uses: actions/setup-go@v4
       with:
-        go-version: 1.18
+        go-version: '^1.20'
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Get dependencies
       run: |

.github/workflows/release.yml

@@ -9,19 +9,19 @@ jobs:
   publishGitRelease:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v4
         with:
-          go-version: '^1.18'
+          go-version: '^1.20'
+          check-latest: true
       - 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::${GITHUB_REF##*/}
+        run: echo "VERSION=${GITHUB_REF##*/}" >> "${GITHUB_OUTPUT}"
 
       - name: Generate man page
         uses: docker://pandoc/core:2.14.2
@@ -35,7 +35,7 @@ jobs:
             --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 }}
+            man.md
 
       - name: Cross compile
         run: |

.github/workflows/snap-release.yml

@@ -0,0 +1,23 @@
+name: Release Snap
+
+on:
+  release:
+    types: [released]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+    buildSnap:
+      environment: snap
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - uses: snapcore/action-build@v1
+          id: build
+        - uses: snapcore/action-publish@v1
+          env:
+            SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.STORE_LOGIN }}
+          with:
+            snap: ${{ steps.build.outputs.snap }}
+            release: stable

.github/workflows/test-yq.yml

@@ -1,5 +1,8 @@
 name: Test Yq Action
-on: [push]
+on: 
+  push:
+  workflow_dispatch:
+
 permissions:
   contents: read
 
@@ -10,13 +13,16 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get test
+        id: get_value
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval '.a' examples/sample.yaml
+          cmd: yq '.test' examples/multiline-text.yaml
+      - name: Multiline test
+        run: echo "### It was [${{ steps.get_value.outputs.result }}]" >> $GITHUB_STEP_SUMMARY
       - name: Write inplace test
         id: lookupSdkVersion
         uses: mikefarah/yq@master
         with:
-          cmd: yq eval -i '.b.c = 5' examples/sample.yaml
+          cmd: yq -i '.b.c = 5' examples/sample.yaml

.gitignore

@@ -41,6 +41,8 @@ yq*.snap
 
 test.yml
 test*.yml
+test*.xml
+test*.toml
 test*.yaml
 0.yml
 1.yml
@@ -56,4 +58,9 @@ _build
 debian/files
 
 # intellij
-/.idea
+/.idea
+
+# vscode
+.vscode
+
+yq3

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Development
 
-1. Install (golang)[https://golang.org/]
+1. Install (Golang)[https://golang.org/]
 1. Run  `scripts/devtools.sh` to install the required devtools
 2. Run `make [local] vendor` to install the vendor dependencies
 2. Run `make [local] test` to ensure you can run the existing tests
@@ -12,7 +12,7 @@
 
 # Documentation
 
-The documentation is a bit of a mixed bag (sorry in advanced, I do plan on simplifying it...) - with some parts automatically generated and stiched together and some statically defined.
+The documentation is a bit of a mixed bag (sorry in advance, I do plan on simplifying it...) - with some parts automatically generated and stiched together and some statically defined.
 
 Documentation is written in markdown, and is published in the 'gitbook' branch.
 

Dockerfile

@@ -1,10 +1,10 @@
-FROM golang:1.18.4 as builder
+FROM golang:1.21.1 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
 COPY . .
 
-RUN CGO_ENABLED=0 go build .
+RUN CGO_ENABLED=0 go build -ldflags "-s -w" .
 # RUN ./scripts/test.sh -- this too often times out in the github pipeline.
 RUN ./scripts/acceptance.sh
 

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.18.4
+FROM golang:1.21.1
 
 COPY scripts/devtools.sh /opt/devtools.sh
 

Makefile

@@ -84,8 +84,12 @@ format: vendor
 	${ENGINERUN} bash ./scripts/format.sh
 
 
+.PHONY: spelling
+spelling: format
+	${ENGINERUN} bash ./scripts/spelling.sh
+
 .PHONY: secure
-secure: format
+secure: spelling
 	${ENGINERUN} bash ./scripts/secure.sh
 
 .PHONY: check

Makefile.variables

@@ -7,6 +7,7 @@ export GIT_DESCRIBE = $(shell git describe --tags --always)
 LDFLAGS :=
 LDFLAGS += -X main.GitCommit=${GIT_COMMIT}${GIT_DIRTY}
 LDFLAGS += -X main.GitDescribe=${GIT_DESCRIBE}
+LDFLAGS += -w -s
 
 GITHUB_TOKEN ?=
 

README.md

@@ -3,31 +3,10 @@
 ![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq) ![CodeQL](https://github.com/mikefarah/yq/workflows/CodeQL/badge.svg)
 
 
-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.
+a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json, xml, properties, csv and tsv. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
 
 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.
 
-## Notice for v4.x versions prior to 4.18.1
-Since 4.18.1, yq's 'eval/e' command is the _default_ command and no longer needs to be specified.
-
-Older versions will still need to specify 'eval/e'.
-
-Similarly, '-' is no longer required as a filename to read from STDIN (unless reading from one or more files).
-
-TLDR:
-
-Prior to 4.18.1 
-```bash
-yq e '.cool' - < file.yaml
-```
-
-4.18+ 
-```bash
-yq '.cool' < file.yaml
-```
-
-When merging multiple files together, `eval-all/ea` is still required to tell `yq` to run the expression against all the document at once.
-
 ## Quick Usage Guide
 
 Read a value:
@@ -40,7 +19,7 @@ Pipe from STDIN:
 yq '.a.b[0].c' < file.yaml
 ```
 
-Update a yaml file, inplace
+Update a yaml file, in place
 ```bash
 yq -i '.a.b[0].c = "cool"' file.yaml
 ```
@@ -66,19 +45,29 @@ yq -i '
 ' file.yaml
 ```
 
-Convert JSON to YAML
+Find and update an item in an array:
 ```bash
-yq -P sample.json
+yq '(.[] | select(.name == "foo") | .address) = "12 cat st"'
 ```
 
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more examples.
+Convert JSON to YAML
+```bash
+yq -Poy sample.json
+```
+
+See [recipes](https://mikefarah.gitbook.io/yq/recipes) for more examples and the [documentation](https://mikefarah.gitbook.io/yq/) for more information.
+
+Take a look at the discussions for [common questions](https://github.com/mikefarah/yq/discussions/categories/q-a), and [cool ideas](https://github.com/mikefarah/yq/discussions/categories/show-and-tell)
 
 ## Install
 
 ### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)
 
 ### wget
-Use wget to download the pre-compiled binaries:
+Use wget to download, gzipped pre-compiled binaries:
+
+
+For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
 
 #### Compressed via tar.gz
 ```bash
@@ -93,7 +82,12 @@ wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /
     chmod +x /usr/bin/yq
 ```
 
-For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
+#### Latest version
+
+```bash
+wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq &&\
+    chmod +x /usr/bin/yq
+```
 
 ### MacOS / Linux via Homebrew:
 Using [Homebrew](https://brew.sh/)
@@ -207,12 +201,27 @@ RUN apk add --no-cache tzdata
 USER yq
 ```
 
+#### Podman with SELinux
+
+If you are using podman with SELinux, you will need to set the shared volume flag `:z` on the volume mount:
+
+```
+-v "${PWD}":/workdir:z
+```
+
 ### GitHub Action
 ```
   - name: Set foobar to cool
     uses: mikefarah/yq@master
     with:
       cmd: yq -i '.foo.bar = "cool"' 'config.yml'
+  - name: Get an entry with a variable that might contain dots or spaces
+    id: get_username
+    uses: mikefarah/yq@master
+    with:
+      cmd: yq '.all.children.["${{ matrix.ip_address }}"].username' ops/inventories/production.yml
+  - name: Reuse a variable obtained in another step
+    run: echo ${{ steps.get_username.outputs.result }}
 ```
 
 See https://mikefarah.gitbook.io/yq/usage/github-action for more.
@@ -225,7 +234,19 @@ go install github.com/mikefarah/yq/v4@latest
 ## Community Supported Installation methods
 As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.
 
-# Webi
+_Please note that the Debian package (previously supported by @rmescandon) is no longer maintained. Please use an alternative installation method._
+
+
+### Nix
+
+```
+nix profile install nixpkgs#yq-go
+```
+
+See [here](https://search.nixos.org/packages?channel=unstable&show=yq-go&from=0&size=50&sort=relevance&type=packages&query=yq-go)
+
+
+### Webi
 
 ```
 webi yq
@@ -241,6 +262,9 @@ pacman -S go-yq
 ```
 
 ### Windows:
+
+Using [Chocolatey](https://chocolatey.org)
+
 [![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)
 ```
@@ -248,6 +272,16 @@ choco install yq
 ```
 Supported by @chillum (https://chocolatey.org/packages/yq)
 
+Using [scoop](https://scoop.sh/)
+```
+scoop install main/yq
+```
+
+Using [winget](https://learn.microsoft.com/en-us/windows/package-manager/)
+```
+winget install --id MikeFarah.yq
+```
+
 ### Mac:
 Using [MacPorts](https://www.macports.org/)
 ```
@@ -265,15 +299,6 @@ Supported by Tuan Hoang
 https://pkgs.alpinelinux.org/package/edge/community/x86/yq
 
 
-### On Ubuntu 16.04 or higher from Debian package:
-```sh
-sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
-sudo add-apt-repository ppa:rmescandon/yq
-sudo apt update
-sudo apt install yq -y
-```
-Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
-
 ## Features
 - [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
@@ -285,15 +310,15 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 - [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 inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update in place](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
 - [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
 - [Decode/Encode base64 data](https://mikefarah.gitbook.io/yq/operators/encode-decode)
 - [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
-- [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [Convert to/from json/ndjson](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
 - [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
 - [Convert to/from properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
-- [Convert to csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
+- [Convert to/from csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
 - [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
 - [Github Action](https://mikefarah.gitbook.io/yq/usage/github-action) to use in your automated pipeline (thanks @devorbitus)
@@ -312,7 +337,7 @@ Examples:
 # yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
 yq '.stuff' < myfile.yml # outputs the data at the "stuff" node from "myfile.yml"
 
-yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml in place
 
 
 Available Commands:
@@ -329,7 +354,7 @@ Flags:
       --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.
+  -i, --inplace                       update the file in place 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 (---)
@@ -348,5 +373,6 @@ Use "yq [command] --help" for more information about a command.
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
 - Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
+- "yes", "no" were dropped as boolean values in the yaml 1.2 standard - which is the standard yq assumes.
 
 See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.

acceptance_tests/bad_args.sh

@@ -3,25 +3,25 @@
 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"
+  assertEquals "Error: write in place 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"
+  assertEquals "Error: write in place 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"
+  assertEquals "Error: write in place 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"
+  assertEquals "Error: write in place cannot be used with split file" "$result"
 }
 
 testNullWithFiles() {

acceptance_tests/basic.sh

@@ -143,7 +143,7 @@ testBasicCatWithFilesNoDash() {
 }
 
 # when the nullinput flag is used
-# dont automatically read STDIN (this breaks github actions)
+# don't automatically read STDIN (this breaks github actions)
 testBasicCreateFileGithubAction() {
   cat /dev/null | ./yq -n ".a = 123" > test.yml
 }
@@ -302,7 +302,7 @@ testBasicExitStatusNoEval() {
   assertEquals 1 "$?"
 }
 
-testBasicExtractFieldWithSeperator() {
+testBasicExtractFieldWithSeparator() {
     cat >test.yml <<EOL
 ---
 name: chart-name
@@ -312,7 +312,7 @@ EOL
   assertEquals "chart-name" "$X"
 }
 
-testBasicExtractMultipleFieldWithSeperator() {
+testBasicExtractMultipleFieldWithSeparator() {
     cat >test.yml <<EOL
 ---
 name: chart-name

acceptance_tests/empty.sh

@@ -9,7 +9,7 @@ EOL
 
 testEmptyEval() {
   X=$(./yq e test.yml)
-  expected=$(cat test.yml)
+  expected="# comment"
   assertEquals 0 $?
   assertEquals "$expected" "$X"
 }

acceptance_tests/header-processing-off.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  
+}
+
+testLineCountFirstLineComment() {
+  cat >test.yml <<EOL
+#test123 
+abc: 123 
+test123: 123123 
+#comment 
+lalilu: lalilu
+EOL
+
+  X=$(./yq '.lalilu | line' --header-preprocess=false < test.yml)
+  assertEquals "5" "$X"
+}
+
+testArrayOfDocs() {
+  cat >test.yml <<EOL
+---
+# leading comment doc 1
+a: 1
+---
+# leading comment doc 2
+a: 2
+EOL
+
+read -r -d '' expected << EOM
+- # leading comment doc 1
+  a: 1
+- # leading comment doc 2
+  a: 2
+EOM
+
+  X=$(./yq ea '[.]' --header-preprocess=false < test.yml)
+  assertEquals "$expected" "$X"
+
+}
+
+source ./scripts/shunit2

acceptance_tests/inputs-format-auto.sh

@@ -0,0 +1,249 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml 2>/dev/null || true
+  rm test*.toml 2>/dev/null || true
+  rm test*.tfstate 2>/dev/null || true
+  rm test*.json 2>/dev/null || true
+  rm test*.properties 2>/dev/null || true
+  rm test*.csv 2>/dev/null || true
+  rm test*.tsv 2>/dev/null || true
+  rm test*.xml 2>/dev/null || true
+}
+
+testInputJson() {
+  cat >test.json <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+{
+  "mike": {
+    "things": "cool"
+  }
+}
+EOM
+
+  X=$(./yq test.json)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.json)
+  assertEquals "$expected" "$X"
+}
+
+testInputToml() {
+  cat >test.toml <<EOL
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00
+EOL
+
+  read -r -d '' expected << EOM
+owner:
+  name: Tom Preston-Werner
+  dob: 1979-05-27T07:32:00-08:00
+EOM
+
+  X=$(./yq -oy test.toml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -oy test.toml)
+  assertEquals "$expected" "$X"
+}
+
+testInputTfstate() {
+  cat >test.tfstate <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+{"mike": {"things": "cool"}}
+EOM
+
+  X=$(./yq test.tfstate)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.tfstate)
+  assertEquals "$expected" "$X"
+}
+
+testInputJsonOutputYaml() {
+  cat >test.json <<EOL
+{ "mike" : { "things": "cool" } }
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: cool
+EOM
+
+  X=$(./yq test.json -oy)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.json -oy)
+  assertEquals "$expected" "$X"
+}
+
+testInputProperties() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike.things = hello
+EOM
+
+  X=$(./yq e test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputPropertiesGitHubAction() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike.things = hello
+EOM
+
+  X=$(cat /dev/null | ./yq e test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+fruit,yumLevel
+apple,5
+banana,4
+EOM
+
+  X=$(./yq e test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVUTF8() {
+  read -r -d '' expected << EOM
+id,first,last
+1,john,smith
+1,jane,smith
+EOM
+
+  X=$(./yq utf8.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSV() {
+  cat >test.tsv <<EOL
+fruit	yumLevel
+apple	5
+banana	4
+EOL
+
+  read -r -d '' expected << EOM
+fruit	yumLevel
+apple	5
+banana	4
+EOM
+
+  X=$(./yq e test.tsv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.tsv)
+  assertEquals "$expected" "$X"
+}
+
+
+
+
+testInputXml() {
+  cat >test.xml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+<cat legs="4">BiBi</cat>
+EOM
+
+  X=$(./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlNamespaces() {
+  cat >test.xml <<EOL
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+EOL
+
+  read -r -d '' expected << EOM
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url"></map>
+EOM
+
+  X=$(./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+
+
+testInputXmlStrict() {
+  cat >test.xml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Catherine.">
+<!ENTITY copyright "(r) Great">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+EOL
+
+  X=$(./yq --xml-strict-mode test.xml  2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: bad file 'test.xml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+
+  X=$(./yq ea --xml-strict-mode test.xml  2>&1)
+  assertEquals "Error: bad file 'test.xml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+}
+
+testInputXmlGithubAction() {
+  cat >test.xml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+<cat legs="4">BiBi</cat>
+EOM
+
+  X=$(cat /dev/null | ./yq e test.xml)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.xml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2

acceptance_tests/inputs-format.sh

@@ -3,6 +3,8 @@
 setUp() {
   rm test*.yml 2>/dev/null || true
   rm test*.properties 2>/dev/null || true
+  rm test*.csv 2>/dev/null || true
+  rm test*.tsv 2>/dev/null || true
   rm test*.xml 2>/dev/null || true
 }
 
@@ -40,6 +42,65 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=csv test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=csv test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputCSVUTF8() {
+  read -r -d '' expected << EOM
+- id: 1
+  first: john
+  last: smith
+- id: 1
+  first: jane
+  last: smith
+EOM
+
+  X=$(./yq -p=csv utf8.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSV() {
+  cat >test.tsv <<EOL
+fruit	yumLevel
+apple	5
+banana	4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=t test.tsv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=t test.tsv)
+  assertEquals "$expected" "$X"
+}
+
+
+
+
 testInputXml() {
   cat >test.yml <<EOL
 <cat legs="4">BiBi</cat>
@@ -48,7 +109,7 @@ EOL
   read -r -d '' expected << EOM
 cat:
   +content: BiBi
-  +legs: "4"
+  +@legs: "4"
 EOM
 
   X=$(./yq e -p=xml test.yml)
@@ -59,23 +120,44 @@ EOM
 }
 
 testInputXmlNamespaces() {
-  cat >test.yml <<EOL
+  cat >test.xml <<EOL
 <?xml version="1.0"?>
 <map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
 </map>
 EOL
 
   read -r -d '' expected << EOM
++p_xml: version="1.0"
 map:
-  +xmlns: some-namespace
-  +xmlns:xsi: some-instance
-  +xsi:schemaLocation: some-url
+  +@xmlns: some-namespace
+  +@xmlns:xsi: some-instance
+  +@xsi:schemaLocation: some-url
 EOM
 
-  X=$(./yq e -p=xml test.yml)
+  X=$(./yq e -p=xml test.xml)
   assertEquals "$expected" "$X"
 
-  X=$(./yq ea -p=xml test.yml)
+  X=$(./yq ea -p=xml test.xml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlRoundtrip() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
+EOL
+
+  read -r -d '' expected << EOM
+<?xml version="1.0"?>
+<!DOCTYPE config SYSTEM "/etc/iwatch/iwatch.dtd" >
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">Meow</map>
+EOM
+
+  X=$(./yq -p=xml -o=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml -o=xml test.yml)
   assertEquals "$expected" "$X"
 }
 
@@ -92,11 +174,11 @@ testInputXmlStrict() {
 </root>
 EOL
 
-  X=$(./yq -p=xml --xml-strict-mode test.yml 2>&1)
+  X=$(./yq -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
   assertEquals 1 $?
   assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
 
-  X=$(./yq ea -p=xml --xml-strict-mode test.yml 2>&1)
+  X=$(./yq ea -p=xml --xml-strict-mode test.yml -o=xml 2>&1)
   assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
 }
 
@@ -108,7 +190,7 @@ EOL
   read -r -d '' expected << EOM
 cat:
   +content: BiBi
-  +legs: "4"
+  +@legs: "4"
 EOM
 
   X=$(cat /dev/null | ./yq e -p=xml test.yml)

acceptance_tests/leading-separator.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+
+# examples where header-preprocess is required
+
 setUp() {
   rm test*.yml || true
   cat >test.yml <<EOL
@@ -8,7 +11,7 @@ a: test
 EOL
 }
 
-testLeadingSeperatorWithDoc() {
+testLeadingSeparatorWithDoc() {
   cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -31,18 +34,94 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorPipeIntoEvalSeq() {
+
+testLeadingSeparatorWithNewlinesNewDoc() {
+  cat >test.yml <<EOL
+# hi peeps
+# cool
+
+
+---
+a: test
+---
+b: cool
+EOL
+
+  read -r -d '' expected << EOM
+# hi peeps
+# cool
+
+
+---
+a: thing
+---
+b: cool
+EOM
+
+  X=$(./yq e '(select(di == 0) | .a) = "thing"' - < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testLeadingSeparatorWithNewlinesMoreComments() {
+  cat >test.yml <<EOL
+# hi peeps
+# cool
+
+---
+# great
+
+a: test
+---
+b: cool
+EOL
+
+  read -r -d '' expected << EOM
+# hi peeps
+# cool
+
+---
+# great
+
+a: thing
+---
+b: cool
+EOM
+
+  X=$(./yq e '(select(di == 0) | .a) = "thing"' - < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testLeadingSeparatorWithDirective() {
+  cat >test.yml <<EOL
+%YAML 1.1
+---
+this: should really work
+EOL
+
+  read -r -d '' expected << EOM
+%YAML 1.1
+---
+this: should really work
+EOM
+
+  X=$(./yq < test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testLeadingSeparatorPipeIntoEvalSeq() {
   X=$(./yq e - < test.yml)
   expected=$(cat test.yml)
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorExtractField() {
+testLeadingSeparatorExtractField() {
   X=$(./yq e '.a' - < test.yml)
   assertEquals "test" "$X"
 }
 
-testLeadingSeperatorExtractFieldWithCommentsAfterSep() {
+testLeadingSeparatorExtractFieldWithCommentsAfterSep() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -53,7 +132,7 @@ EOL
   assertEquals "test" "$X"
 }
 
-testLeadingSeperatorExtractFieldWithCommentsBeforeSep() {
+testLeadingSeparatorExtractFieldWithCommentsBeforeSep() {
   cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -65,7 +144,7 @@ EOL
 }
 
 
-testLeadingSeperatorExtractFieldMultiDoc() {
+testLeadingSeparatorExtractFieldMultiDoc() {
   cat >test.yml <<EOL
 ---
 a: test
@@ -82,13 +161,13 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorExtractFieldMultiDocWithComments() {
+testLeadingSeparatorExtractFieldMultiDocWithComments() {
   cat >test.yml <<EOL
 # here
 ---
 # there
 a: test
-# whereever
+# wherever
 ---
 # you are
 a: test2
@@ -105,26 +184,26 @@ EOM
 }
 
 
-testLeadingSeperatorEvalSeq() {
+testLeadingSeparatorEvalSeq() {
   X=$(./yq e test.yml)
   expected=$(cat test.yml)
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorPipeIntoEvalAll() {
+testLeadingSeparatorPipeIntoEvalAll() {
   X=$(./yq ea - < test.yml)
   expected=$(cat test.yml)
   assertEquals "$expected" "$X"
 }
 
 
-testLeadingSeperatorEvalAll() {
+testLeadingSeparatorEvalAll() {
   X=$(./yq ea test.yml)
   expected=$(cat test.yml)
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalSimple() {
+testLeadingSeparatorMultiDocEvalSimple() {
   read -r -d '' expected << EOM
 ---
 a: test
@@ -138,7 +217,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocInOneFile() {
+testLeadingSeparatorMultiDocInOneFile() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -152,7 +231,7 @@ EOL
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocInOneFileEvalAll() {
+testLeadingSeparatorMultiDocInOneFileEvalAll() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -166,7 +245,7 @@ EOL
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalComments() {
+testLeadingSeparatorMultiDocEvalComments() {
   cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -194,7 +273,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalCommentsTrailingSep() {
+testLeadingSeparatorMultiDocEvalCommentsTrailingSep() {
   cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -226,7 +305,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiMultiDocEvalCommentsTrailingSep() {
+testLeadingSeparatorMultiMultiDocEvalCommentsTrailingSep() {
   cat >test.yml <<EOL
 # hi peeps
 # cool
@@ -266,7 +345,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalCommentsLeadingSep() {
+testLeadingSeparatorMultiDocEvalCommentsLeadingSep() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -326,7 +405,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalCommentsStripComments() {
+testLeadingSeparatorMultiDocEvalCommentsStripComments() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -349,7 +428,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalCommentsLeadingSepNoDocFlag() {
+testLeadingSeparatorMultiDocEvalCommentsLeadingSepNoDocFlag() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -375,7 +454,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalJsonFlag() {
+testLeadingSeparatorMultiDocEvalJsonFlag() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -404,7 +483,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalAllJsonFlag() {
+testLeadingSeparatorMultiDocEvalAllJsonFlag() {
   cat >test.yml <<EOL
 ---
 # hi peeps
@@ -433,7 +512,7 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testLeadingSeperatorMultiDocEvalAll() {
+testLeadingSeparatorMultiDocEvalAll() {
   read -r -d '' expected << EOM
 ---
 a: test

acceptance_tests/nul-separator.sh

@@ -0,0 +1,286 @@
+#!/bin/bash
+
+setUp() {
+    rm test*.yml || true
+}
+
+## Convenient bash shortcut to read records of NUL separated values
+## from stdin the safe way. See example usage in the next tests.
+read-0() {
+    local eof="" IFS=''
+    while [ "$1" ]; do
+        ## - The `-r` avoids bad surprise with '\n' and other interpreted
+        ##   sequences that can be read.
+        ## - The `-d ''` is the (strange?) way to refer to NUL delimiter.
+        ## - The `--` is how to avoid unpleasant surprises if your
+        ##   "$1" starts with "-" (minus) sign. This protection also
+        ##   will produce a readable error if you want to try to start
+        ##   your variable names with a "-".
+        read -r -d '' -- "$1" || eof=1
+        shift
+    done
+    [ -z "$eof" ] ## fail on EOF
+}
+
+## Convenient bash shortcut to be used with the next function `p-err`
+## to read NUL separated values the safe way AND catch any errors from
+## the process creating the stream of NUL separated data.  See example
+## usage in the tests.
+read-0-err() {
+    local ret="$1" eof="" idx=0 last=
+    read -r -- "${ret?}" <<<"0"
+    shift
+    while [ "$1" ]; do
+        last=$idx
+        read -r -d '' -- "$1" || {
+            ## Put this last value in ${!ret}
+            eof="$1"
+            read -r -- "$ret" <<<"${!eof}"
+            break
+        }
+        ((idx++))
+        shift
+    done
+    [ -z "$eof" ] || {
+        if [ "$last" != 0 ]; then
+            ## Uhoh, we have no idea if the errorlevel of the internal
+            ## command was properly delimited with a NUL char, and
+            ## anyway something went really wrong at least about the
+            ## number of fields separated by NUL char and the one
+            ## expected.
+            echo "Error: read-0-err couldn't fill all value $ret = '${!ret}', '$eof', '${!eof}'" >&2
+            read -r -- "$ret" <<<"not-enough-values"
+        else
+            if ! [[ "${!ret}" =~ ^[0-9]+$ && "${!ret}" -ge 0 && "${!ret}" -le 127 ]]; then
+                ## This could happen if you don't use `p-err` wrapper,
+                ## or used stdout in unexpected ways in your inner
+                ## command.
+                echo "Error: last value is not a number, did you finish with an errorlevel ?" >&2
+                read -r -- "$ret" <<<"last-value-not-a-number"
+            fi
+        fi
+        false
+    }
+}
+
+## Simply runs command given as argument and adds errorlevel in the
+## standard output. Is expected to be used in tandem with
+## `read-0-err`.
+p-err() {
+    local exp="$1"
+    "$@"
+    printf "%s" "$?"
+}
+
+wyq-r() {
+    local exp="$1"
+    ./yq e -0 -r=false "$1"
+    printf "%s" "$?"
+}
+
+testBasicUsageRaw() {
+  cat >test.yml <<EOL
+a: foo
+b: bar
+EOL
+
+  printf "foo\0bar\0" > expected.out
+
+  ## We need to compare binary content here. We have to filter the compared
+  ## content through a representation that gets rid of NUL chars but accurately
+  ## transcribe the content.
+  ## Also as it would be nice to have a pretty output in case the test fails,
+  ## we use here 'hd': a widely available shortcut to 'hexdump' that will
+  ## pretty-print any binary to it's hexadecimal representation.
+  ##
+  ## Note that the standard `assertEquals` compare its arguments
+  ## value, but they can't hold NUL characters (this comes from the
+  ## limitation of the C API of `exec*(..)` functions that requires
+  ## `const char *arv[]`). And these are NUL terminated strings.  As a
+  ## consequence, the NUL characters gets removed in bash arguments.
+  assertEquals "$(hd expected.out)" \
+               "$(./yq e -0 '.a, .b' test.yml | hd)"
+
+  rm expected.out
+}
+
+testBasicUsage() {
+  local a b
+  cat >test.yml <<EOL
+a: foo
+b: bar
+EOL
+
+  ## We provide 2 values, and ask to fill 2 variables.
+  read-0 a b < <(./yq e -0 '.a, .b' test.yml)
+  assertEquals "$?" "0"      ## Everything is fine
+  assertEquals "foo" "$a"    ## Values are correctly parsed
+  assertEquals "bar" "$b"
+
+  a=YYY ; b=XXX
+  ## Not enough values provided to fill `a` and `b`.
+  read-0 a b < <(./yq e -0 '.a' test.yml)
+  assertEquals "$?" "1"      ## An error was emitted
+  assertEquals "foo" "$a"    ## First value was correctly parsed
+  assertEquals "" "$b"       ## Second was still reset
+
+  ## Error from inner command are not catchable !. Use
+  ## `read-0-err`/`p-err` for that.
+  read-0 a < <(printf "\0"; ./yq e -0 'xxx' test.yml; )
+  assertEquals "$?" "0"
+
+}
+
+testBasicUsageJson() {
+  cat >test.yml <<EOL
+a:
+  x: foo
+b: bar
+EOL
+
+  read-0 a b < <(./yq e -0 -o=json '.a, .b' test.yml)
+
+  assertEquals '{
+  "x": "foo"
+}' "$a"
+  assertEquals '"bar"' "$b"
+
+}
+
+testFailWithValueContainingNUL() {
+  local a b c
+  ## Note that value of field 'a' actually contains a NUL char !
+  cat >test.yml <<EOL
+a: "foo\u0000bar"
+b: 1
+c: |
+  wiz
+  boom
+EOL
+
+  ## We are looking for trouble with asking to separated fields with NUL
+  ## char and requested value `.a` actually contains itself a NUL char !
+  read-0 a b c < <(./yq e -0 '.a, .b, .c' test.yml)
+  assertNotEquals "0" "$?"   ## read-0 failed to fill all values
+
+  ## But here, we can request for one value, even if `./yq` fails
+  read-0 b < <(./yq e -0 '.b, .a' test.yml)
+  assertEquals "0" "$?"   ## read-0 succeeds at feeding the first value
+  ## Note: to catch the failure of `yq`, see in the next tests the usage
+  ## of `read-0-err`.
+
+  ## using -r=false solves any NUL containing value issues, but keeps
+  ## all in YAML representation:
+  read-0 a b c < <(./yq e -0 -r=false '.a, .b, .c' test.yml)
+  assertEquals "0" "$?"    ## All goes well despite asking for `a` value
+
+  assertEquals '"foo\0bar"' "$a"   ## This is a YAML string representation
+  assertEquals '1' "$b"
+  assertEquals '|
+  wiz
+  boom' "$c"
+}
+
+testStandardLoop() {
+    local E a b res
+
+    ## Here everything is normal: 4 values, that will be paired
+    ## in key/values.
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- pow
+EOL
+
+    res=""
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+
+    assertEquals "0" "$E"                     ## errorlevel of internal command
+    assertEquals "yay: wiz;hop: pow;" "$res"  ## expected result
+}
+
+testStandardLoopWithoutEnoughValues() {
+    local E a b res
+
+    ## Here 5 values, there will be a missing value when reading
+    ## pairs of value.
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- pow
+- kwak
+EOL
+
+    res=""
+    ## The loop will succeed 2 times then fail
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+
+    assertEquals "not-enough-values" "$E"     ## Not enough value error
+    assertEquals "yay: wiz;hop: pow;" "$res"  ## the 2 full key/value pairs
+
+}
+
+testStandardLoopWithInternalCmdError() {
+    local E a b res
+
+    ## Note the third value contains a NUL char !
+    cat >test.yml <<EOL
+- yay
+- wiz
+- "foo\0bar"
+- hop
+- pow
+EOL
+
+    res=""
+    ## It should be only upon the second pass in the loop that
+    ## read-0-err will catch the fact that there is an error !
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+    assertEquals "1" "$E"            ## Internal command errorlevel (from `./yq`)
+    assertEquals "yay: wiz;" "$res"  ## first 2 values were ok at least
+
+}
+
+testStandardLoopNotEnoughErrorEatsCmdError() {
+    local E a b res
+
+    ## Because of possible edge cases where the internal errorlevel
+    ## reported by `p-err` in the standard output might be mangled
+    ## with the unfinished record, `read-0-err E ...` will NOT report
+    ## the internal command error in the variable E and instead will
+    ## store the value 'not-enough-values'. In real world, anyway, you
+    ## will want to react the same if the internal command failed
+    ## and/or you didn't get as much values as expected while
+    ## reading. Keep in mind also that standard error is not
+    ## swallowed, so you can read reports from the inner command AND
+    ## from `read-0-err`.
+
+    ## Here, note that the fourth value contains a NUL char !
+    cat >test.yml <<EOL
+- yay
+- wiz
+- hop
+- "foo\0bar"
+- pow
+EOL
+
+    res=""
+    ## It should be only upon the second loop that read-0-err will catch
+    ## the fact that there are not enough data to fill the requested variables
+    while read-0-err E a b; do
+        res+="$a: $b;"
+    done < <(p-err ./yq -0 '.[]' test.yml)
+    assertEquals "not-enough-values" "$E"          ## Not enough values error eats internal error !
+    assertEquals "yay: wiz;" "$res"  ## first 2 values were ok at least
+}
+
+
+source ./scripts/shunit2

acceptance_tests/output-format.sh

@@ -48,6 +48,55 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testOutputYamlRawDefault() {
+  cat >test.yml <<EOL
+a: "cat"
+EOL
+
+  X=$(./yq e  '.a' test.yml)
+  assertEquals "cat" "$X"
+
+  X=$(./yq ea '.a' test.yml)
+  assertEquals "cat" "$X"
+}
+
+testOutputYamlRawOff() {
+  cat >test.yml <<EOL
+a: "cat"
+EOL
+
+  X=$(./yq e -r=false '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+
+  X=$(./yq ea -r=false '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+}
+
+testOutputJsonRaw() {
+  cat >test.yml <<EOL
+a: cat
+EOL
+
+  X=$(./yq e -r --output-format=json '.a' test.yml)
+  assertEquals "cat" "$X"
+
+  X=$(./yq ea -r --output-format=json '.a' test.yml)
+  assertEquals "cat" "$X"
+}
+
+testOutputJsonDefault() {
+  cat >test.yml <<EOL
+a: cat
+EOL
+
+  X=$(./yq e --output-format=json '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+
+  X=$(./yq ea --output-format=json '.a' test.yml)
+  assertEquals "\"cat\"" "$X"
+}
+
+
 testOutputJsonShort() {
   cat >test.yml <<EOL
 a: {b: ["cat"]}
@@ -72,11 +121,11 @@ EOM
 
 testOutputProperties() {
   cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
+a: {b: {c: ["cat cat"]}}
 EOL
 
   read -r -d '' expected << EOM
-a.b.c.0 = cat
+a.b.c.0 = cat cat
 EOM
 
   X=$(./yq e --output-format=props test.yml)
@@ -86,13 +135,30 @@ EOM
   assertEquals "$expected" "$X"
 }
 
-testOutputPropertiesShort() {
+testOutputPropertiesDontUnwrap() {
   cat >test.yml <<EOL
-a: {b: {c: ["cat"]}}
+a: {b: {c: ["cat cat"]}}
 EOL
 
   read -r -d '' expected << EOM
-a.b.c.0 = cat
+a.b.c.0 = "cat cat"
+EOM
+
+  X=$(./yq e -r=false --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -r=false --output-format=props test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testOutputPropertiesShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+a.b.c.0 = cat cat
 EOM
 
   X=$(./yq e -o=p test.yml)
@@ -102,6 +168,48 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testOutputCSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit,yumLevel
+apple,5
+banana,4
+EOM
+
+  X=$(./yq -o=c test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=csv test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputTSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit	yumLevel
+apple	5
+banana	4
+EOM
+
+  X=$(./yq -o=t test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=tsv test.yml)
+  assertEquals "$expected" "$X"
+}
+
 testOutputXml() {
   cat >test.yml <<EOL
 a: {b: {c: ["cat"]}}
@@ -144,7 +252,7 @@ EOM
 
 testOutputXmComplex() {
   cat >test.yml <<EOL
-a: {b: {c: ["cat", "dog"], +f: meow}}
+a: {b: {c: ["cat", "dog"], +@f: meow}}
 EOL
 
   read -r -d '' expected << EOM

action.yml

@@ -12,6 +12,6 @@ outputs:
     description: "The complete result from the yq command being run"
 runs:
   using: 'docker'
-  image: 'github-action/Dockerfile'
+  image: 'docker://mikefarah/yq:4-githubaction'
   args:
     - ${{ inputs.cmd }}

cmd/constant.go

@@ -1,18 +1,15 @@
 package cmd
 
-var leadingContentPreProcessing = true
-var unwrapScalar = true
+var unwrapScalarFlag = newUnwrapFlag()
+
+var unwrapScalar = false
 
 var writeInplace = false
 var outputToJSON = false
-var outputFormat = "yaml"
-var inputFormat = "yaml"
 
-var xmlAttributePrefix = "+"
-var xmlContentName = "+content"
-var xmlStrictMode = false
-var xmlKeepNamespace = true
-var xmlUseRawToken = true
+var outputFormat = ""
+
+var inputFormat = ""
 
 var exitStatus = false
 var forceColor = false
@@ -21,6 +18,7 @@ var colorsEnabled = false
 var indent = 2
 var noDocSeparators = false
 var nullInput = false
+var nulSepOutput = false
 var verbose = false
 var version = false
 var prettyPrint = false

cmd/evaluate_all_command.go

@@ -13,7 +13,7 @@ func createEvaluateAllCommand() *cobra.Command {
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
 		Example: `
-# Merge f2.yml into f1.yml (inplace)
+# Merge f2.yml into f1.yml (in place)
 yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml
 ## the same command and expression using shortened names:
 yq ea -i 'select(fi == 0) * select(fi == 1)' f1.yml f2.yml
@@ -75,7 +75,7 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 		return err
 	}
 
-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(true)
 	if err != nil {
 		return err
 	}
@@ -84,9 +84,15 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	if err != nil {
 		return err
 	}
-	encoder := configureEncoder(format)
+	encoder, err := configureEncoder()
+	if err != nil {
+		return err
+	}
 
 	printer := yqlib.NewPrinter(encoder, printerWriter)
+	if nulSepOutput {
+		printer.SetNulSepOutput(true)
+	}
 
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
@@ -109,13 +115,13 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	switch len(args) {
 	case 0:
 		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer, "")
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}
 
 	completedSuccessfully = err == nil

cmd/evaluate_sequence_command.go

@@ -28,7 +28,7 @@ cat file2.yml | yq e '.a.b' file1.yml - file3.yml
 ## Note that editing an empty file does not work.
 yq e -n '.a.b.c = "cat"' 
 
-# Update a file inplace
+# Update a file in place
 yq e '.a.b = "cool"' -i file.yaml 
 `,
 		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
@@ -93,11 +93,17 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	if err != nil {
 		return err
 	}
-	encoder := configureEncoder(format)
+	encoder, err := configureEncoder()
+	if err != nil {
+		return err
+	}
 
 	printer := yqlib.NewPrinter(encoder, printerWriter)
+	if nulSepOutput {
+		printer.SetNulSepOutput(true)
+	}
 
-	decoder, err := configureDecoder()
+	decoder, err := configureDecoder(false)
 	if err != nil {
 		return err
 	}
@@ -123,13 +129,13 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	switch len(args) {
 	case 0:
 		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(expression), printer, "")
+			err = streamEvaluator.EvaluateNew(processExpression(expression), printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, decoder)
 	}
 	completedSuccessfully = err == nil
 

cmd/root.go

@@ -35,7 +35,7 @@ yq -P sample.json
 			return evaluateSequence(cmd, args)
 
 		},
-		PersistentPreRun: func(cmd *cobra.Command, args []string) {
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 			cmd.SetOut(cmd.OutOrStdout())
 
 			var format = logging.MustStringFormatter(
@@ -47,14 +47,13 @@ yq -P sample.json
 			if verbose {
 				backend.SetLevel(logging.DEBUG, "")
 			} else {
-				backend.SetLevel(logging.ERROR, "")
+				backend.SetLevel(logging.WARNING, "")
 			}
 
 			logging.SetBackend(backend)
 			yqlib.InitExpressionParser()
-			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
-			yqlib.XMLPreferences.ContentName = xmlContentName
-			yqlib.XMLPreferences.StrictMode = xmlStrictMode
+
+			return nil
 		},
 	}
 
@@ -66,22 +65,34 @@ yq -P sample.json
 		panic(err)
 	}
 
-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p|xml|x] output format type.")
-	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "yaml", "[yaml|y|props|p|xml|x] parse format for input. Note that json is a subset of yaml.")
+	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "auto", "[auto|a|yaml|y|json|j|props|p|xml|x|tsv|t|csv|c] output format type.")
+	rootCmd.PersistentFlags().StringVarP(&inputFormat, "input-format", "p", "auto", "[auto|a|yaml|y|props|p|xml|x|tsv|t|csv|c|toml] 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().BoolVar(&xmlStrictMode, "xml-strict-mode", false, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
-	rootCmd.PersistentFlags().BoolVar(&xmlKeepNamespace, "xml-keep-namespace", true, "enables keeping namespace after parsing attributes")
-	rootCmd.PersistentFlags().BoolVar(&xmlUseRawToken, "xml-raw-token", true, "enables using RawToken method instead Token. Commonly disables namespace translations. See https://pkg.go.dev/encoding/xml#Decoder.RawToken for details.")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.AttributePrefix, "xml-attribute-prefix", yqlib.ConfiguredXMLPreferences.AttributePrefix, "prefix for xml attributes")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ContentName, "xml-content-name", yqlib.ConfiguredXMLPreferences.ContentName, "name for xml content (if no attribute name is present).")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.StrictMode, "xml-strict-mode", yqlib.ConfiguredXMLPreferences.StrictMode, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.KeepNamespace, "xml-keep-namespace", yqlib.ConfiguredXMLPreferences.KeepNamespace, "enables keeping namespace after parsing attributes")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.UseRawToken, "xml-raw-token", yqlib.ConfiguredXMLPreferences.UseRawToken, "enables using RawToken method instead Token. Commonly disables namespace translations. See https://pkg.go.dev/encoding/xml#Decoder.RawToken for details.")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.ProcInstPrefix, "xml-proc-inst-prefix", yqlib.ConfiguredXMLPreferences.ProcInstPrefix, "prefix for xml processing instructions (e.g. <?xml version=\"1\"?>)")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredXMLPreferences.DirectiveName, "xml-directive-name", yqlib.ConfiguredXMLPreferences.DirectiveName, "name for xml directives (e.g. <!DOCTYPE thing cat>)")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipProcInst, "xml-skip-proc-inst", yqlib.ConfiguredXMLPreferences.SkipProcInst, "skip over process instructions (e.g. <?xml version=\"1\"?>)")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredXMLPreferences.SkipDirectives, "xml-skip-directives", yqlib.ConfiguredXMLPreferences.SkipDirectives, "skip over directives (e.g. <!DOCTYPE thing cat>)")
+
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredLuaPreferences.DocPrefix, "lua-prefix", yqlib.ConfiguredLuaPreferences.DocPrefix, "prefix")
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredLuaPreferences.DocSuffix, "lua-suffix", yqlib.ConfiguredLuaPreferences.DocSuffix, "suffix")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.UnquotedKeys, "lua-unquoted", yqlib.ConfiguredLuaPreferences.UnquotedKeys, "output unquoted string keys (e.g. {foo=\"bar\"})")
+	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.Globals, "lua-globals", yqlib.ConfiguredLuaPreferences.Globals, "output keys as top-level global variables")
 
 	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 file inplace of first file given.")
-	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "r", true, "unwrap scalar, print the value with no quotes, colors or comments")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file in place of first file given.")
+	rootCmd.PersistentFlags().VarP(unwrapScalarFlag, "unwrapScalar", "r", "unwrap scalar, print the value with no quotes, colors or comments. Defaults to true for yaml")
+	rootCmd.PersistentFlags().Lookup("unwrapScalar").NoOptDefVal = "true"
+	rootCmd.PersistentFlags().BoolVarP(&nulSepOutput, "nul-output", "0", false, "Use NUL char to separate values. If unwrap scalar is also set, fail if unwrapped scalar contains NUL char.")
+
 	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")
 
@@ -89,7 +100,7 @@ yq -P sample.json
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
 	rootCmd.PersistentFlags().StringVarP(&frontMatter, "front-matter", "f", "", "(extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact")
 	rootCmd.PersistentFlags().StringVarP(&forceExpression, "expression", "", "", "forcibly set the expression argument. Useful when yq argument detection thinks your expression is a file.")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")
+	rootCmd.PersistentFlags().BoolVarP(&yqlib.ConfiguredYamlPreferences.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.PersistentFlags().StringVarP(&splitFileExpFile, "split-exp-file", "", "", "Use a file to specify the split-exp expression.")

cmd/shell-completion.go

@@ -42,7 +42,7 @@ $ yq shell-completion fish > ~/.config/fish/completions/yq.fish
 `,
 	DisableFlagsInUseLine: true,
 	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
-	Args:                  cobra.ExactValidArgs(1),
+	Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		var err error = nil
 		switch args[0] {

cmd/unwrap_flag.go

@@ -0,0 +1,46 @@
+package cmd
+
+import (
+	"strconv"
+
+	"github.com/spf13/pflag"
+)
+
+type boolFlag interface {
+	pflag.Value
+	IsExplicitlySet() bool
+	IsSet() bool
+}
+
+type unwrapScalarFlagStrc struct {
+	explicitlySet bool
+	value         bool
+}
+
+func newUnwrapFlag() boolFlag {
+	return &unwrapScalarFlagStrc{value: true}
+}
+
+func (f *unwrapScalarFlagStrc) IsExplicitlySet() bool {
+	return f.explicitlySet
+}
+
+func (f *unwrapScalarFlagStrc) IsSet() bool {
+	return f.value
+}
+
+func (f *unwrapScalarFlagStrc) String() string {
+	return strconv.FormatBool(f.value)
+}
+
+func (f *unwrapScalarFlagStrc) Set(value string) error {
+
+	v, err := strconv.ParseBool(value)
+	f.value = v
+	f.explicitlySet = true
+	return err
+}
+
+func (*unwrapScalarFlagStrc) Type() string {
+	return "bool"
+}

cmd/utils.go

@@ -10,6 +10,10 @@ import (
 	"gopkg.in/op/go-logging.v1"
 )
 
+func isAutomaticOutputFormat() bool {
+	return outputFormat == "" || outputFormat == "auto" || outputFormat == "a"
+}
+
 func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	cmd.SilenceUsage = true
 
@@ -38,7 +42,7 @@ func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	}
 
 	if writeInplace && (len(args) == 0 || args[0] == "-") {
-		return "", nil, fmt.Errorf("write inplace flag only applicable when giving an expression and at least one file")
+		return "", nil, fmt.Errorf("write in place flag only applicable when giving an expression and at least one file")
 	}
 
 	if frontMatter != "" && len(args) == 0 {
@@ -46,31 +50,104 @@ func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	}
 
 	if writeInplace && splitFileExp != "" {
-		return "", nil, fmt.Errorf("write inplace cannot be used with split file")
+		return "", nil, fmt.Errorf("write in place cannot be used with split file")
 	}
 
 	if nullInput && len(args) > 0 {
 		return "", nil, fmt.Errorf("cannot pass files in when using null-input flag")
 	}
 
+	inputFilename := ""
+	if len(args) > 0 {
+		inputFilename = args[0]
+	}
+	if inputFormat == "" || inputFormat == "auto" || inputFormat == "a" {
+
+		inputFormat = yqlib.FormatFromFilename(inputFilename)
+
+		_, err := yqlib.InputFormatFromString(inputFormat)
+		if err != nil {
+			// unknown file type, default to yaml
+			yqlib.GetLogger().Debug("Unknown file format extension '%v', defaulting to yaml", inputFormat)
+			inputFormat = "yaml"
+			if isAutomaticOutputFormat() {
+				outputFormat = "yaml"
+			}
+		} else if isAutomaticOutputFormat() {
+			// automatic input worked, we can do it for output too unless specified
+			if inputFormat == "json" {
+				yqlib.GetLogger().Warning("JSON file output is now JSON by default (instead of yaml). Use '-oy' or '--output-format=yaml' for yaml output")
+			}
+			outputFormat = inputFormat
+		}
+	} else if isAutomaticOutputFormat() {
+		// backwards compatibility -
+		// before this was introduced, `yq -pcsv things.csv`
+		// would produce *yaml* output.
+		//
+		outputFormat = yqlib.FormatFromFilename(inputFilename)
+		if inputFilename != "-" {
+			yqlib.GetLogger().Warning("yq default output is now 'auto' (based on the filename extension). Normally yq would output '%v', but for backwards compatibility 'yaml' has been set. Please use -oy to specify yaml, or drop the -p flag.", outputFormat)
+		}
+		outputFormat = "yaml"
+	}
+
+	outputFormatType, err := yqlib.OutputFormatFromString(outputFormat)
+
+	if err != nil {
+		return "", nil, err
+	}
+	yqlib.GetLogger().Debug("Using input format %v", inputFormat)
+	yqlib.GetLogger().Debug("Using output format %v", outputFormat)
+
+	if outputFormatType == yqlib.YamlOutputFormat ||
+		outputFormatType == yqlib.PropsOutputFormat {
+		unwrapScalar = true
+	}
+	if unwrapScalarFlag.IsExplicitlySet() {
+		unwrapScalar = unwrapScalarFlag.IsSet()
+	}
+
+	//copy preference form global setting
+	yqlib.ConfiguredYamlPreferences.UnwrapScalar = unwrapScalar
+
+	yqlib.ConfiguredYamlPreferences.PrintDocSeparators = !noDocSeparators
+
 	return expression, args, nil
 }
 
-func configureDecoder() (yqlib.Decoder, error) {
+func configureDecoder(evaluateTogether bool) (yqlib.Decoder, error) {
 	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
 	if err != nil {
 		return nil, err
 	}
-	switch yqlibInputFormat {
+	yqlibDecoder, err := createDecoder(yqlibInputFormat, evaluateTogether)
+	if yqlibDecoder == nil {
+		return nil, fmt.Errorf("no support for %s input format", inputFormat)
+	}
+	return yqlibDecoder, err
+}
+
+func createDecoder(format yqlib.InputFormat, evaluateTogether bool) (yqlib.Decoder, error) {
+	switch format {
 	case yqlib.XMLInputFormat:
-		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName, xmlStrictMode, xmlKeepNamespace, xmlUseRawToken), nil
+		return yqlib.NewXMLDecoder(yqlib.ConfiguredXMLPreferences), nil
 	case yqlib.PropertiesInputFormat:
 		return yqlib.NewPropertiesDecoder(), nil
 	case yqlib.JsonInputFormat:
 		return yqlib.NewJSONDecoder(), nil
+	case yqlib.CSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder(','), nil
+	case yqlib.TSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder('\t'), nil
+	case yqlib.TomlInputFormat:
+		return yqlib.NewTomlDecoder(), nil
+	case yqlib.YamlInputFormat:
+		prefs := yqlib.ConfiguredYamlPreferences
+		prefs.EvaluateTogether = evaluateTogether
+		return yqlib.NewYamlDecoder(prefs), nil
 	}
-
-	return yqlib.NewYamlDecoder(), nil
+	return nil, fmt.Errorf("invalid decoder: %v", format)
 }
 
 func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yqlib.PrinterWriter, error) {
@@ -90,22 +167,40 @@ func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yq
 	return printerWriter, nil
 }
 
-func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
+func configureEncoder() (yqlib.Encoder, error) {
+	yqlibOutputFormat, err := yqlib.OutputFormatFromString(outputFormat)
+	if err != nil {
+		return nil, err
+	}
+	yqlibEncoder, err := createEncoder(yqlibOutputFormat)
+	if yqlibEncoder == nil {
+		return nil, fmt.Errorf("no support for %s output format", outputFormat)
+	}
+	return yqlibEncoder, err
+}
+
+func createEncoder(format yqlib.PrinterOutputFormat) (yqlib.Encoder, error) {
 	switch format {
 	case yqlib.JSONOutputFormat:
-		return yqlib.NewJSONEncoder(indent, colorsEnabled)
+		return yqlib.NewJSONEncoder(indent, colorsEnabled, unwrapScalar), nil
 	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder(unwrapScalar)
+		return yqlib.NewPropertiesEncoder(unwrapScalar), nil
 	case yqlib.CSVOutputFormat:
-		return yqlib.NewCsvEncoder(',')
+		return yqlib.NewCsvEncoder(','), nil
 	case yqlib.TSVOutputFormat:
-		return yqlib.NewCsvEncoder('\t')
+		return yqlib.NewCsvEncoder('\t'), nil
 	case yqlib.YamlOutputFormat:
-		return yqlib.NewYamlEncoder(indent, colorsEnabled, !noDocSeparators, unwrapScalar)
+		return yqlib.NewYamlEncoder(indent, colorsEnabled, yqlib.ConfiguredYamlPreferences), nil
 	case yqlib.XMLOutputFormat:
-		return yqlib.NewXMLEncoder(indent, xmlAttributePrefix, xmlContentName)
+		return yqlib.NewXMLEncoder(indent, yqlib.ConfiguredXMLPreferences), nil
+	case yqlib.TomlOutputFormat:
+		return yqlib.NewTomlEncoder(), nil
+	case yqlib.ShellVariablesOutputFormat:
+		return yqlib.NewShellVariablesEncoder(), nil
+	case yqlib.LuaOutputFormat:
+		return yqlib.NewLuaEncoder(yqlib.ConfiguredLuaPreferences), nil
 	}
-	panic("invalid encoder")
+	return nil, fmt.Errorf("invalid encoder: %v", format)
 }
 
 // this is a hack to enable backwards compatibility with githubactions (which pipe /dev/null into everything)

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.26.1"
+	Version = "v4.35.2"
 
 	// 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

cspell.config.yaml

@@ -0,0 +1,14 @@
+---
+$schema: https://raw.githubusercontent.com/streetsidesoftware/cspell/main/cspell.schema.json
+version: '0.2'
+language: en-GB
+dictionaryDefinitions:
+  - name: project-words
+    path: './project-words.txt'
+    addWords: true
+dictionaries:
+  - project-words
+ignorePaths:
+  - 'vendor'
+  - 'bin'
+  - '/project-words.txt'

debian/changelog

@@ -103,7 +103,7 @@ yq (4.16.2) focal; urgency=medium
   * 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
+  * Bump Golang compiler #1037
 
  -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 21 Dec 2021 09:41:44 +0000
 
@@ -127,7 +127,7 @@ yq (4.9.6) focal; urgency=medium
 
   * Added darwin/arm64 build, thanks @alecthomas
   * Incremented docker alpine base version, thanks @da6d6i7-bronga
-  * Bug fix: multine expression
+  * Bug fix: multiline expression
   * Bug fix: special character
 
  -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 29 Jun 2021 21:32:14 +0200

examples/array.yaml

@@ -1,11 +1,2 @@
----
-- become: true
-  gather_facts: false
-  hosts: lalaland
-  name: "Apply smth"
-  roles:
-    - lala
-    - land
-  serial: 1
-- become: false
-  gather_facts: true
+- [cat, dog, frog, cow]
+- [apple, banana, grape, mango]

examples/data1.yaml

@@ -1,12 +1 @@
-# --------------------------------------------------
-# It's a test with comment
-# --------------------------------------------------
-test:
-  - name: a
-  - name: b
-  - name: c
-groups:
-  - name: a
-  - name: b
-  - name: c
-  - name: c
+["foobar", "foobaz", "blarp"]

examples/mike.xml

@@ -1,14 +1 @@
-<!-- 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 -->
+<cat>3</cat>

examples/sample.toml

@@ -0,0 +1,26 @@
+
+
+# This is a TOML document
+
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00
+
+[database]
+enabled = true
+ports = [ 8000, 8001, 8002 ]
+data = [ ["delta", "phi"], [3.14] ]
+temp_targets = { cpu = 79.5, case = 72.0 }
+
+[servers]
+
+[servers.alpha]
+ip = "10.0.0.1"
+role = "frontend"
+
+[servers.beta]
+ip = "10.0.0.2"
+role = "backend"
+

examples/sample_objects.csv

@@ -0,0 +1,3 @@
+name,numberOfCats,likesApples,height
+,1,true,168.8
+Samantha's Rabbit,2,false,-188.8

examples/small.yaml

@@ -0,0 +1,4 @@
+---
+# comment
+# about things
+a: cat

github-action/Dockerfile

@@ -2,7 +2,8 @@ FROM mikefarah/yq:4
 
 COPY entrypoint.sh /entrypoint.sh
 
-# this seems to be the default user in github actions
-USER 1001
+# github action recommendation is to run as root.
+# https://docs.github.com/en/actions/creating-actions/dockerfile-support-for-github-actions#user
+USER root
 
 ENTRYPOINT ["/entrypoint.sh"]

github-action/entrypoint.sh

@@ -2,8 +2,11 @@
 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"
+# updating from 
+# https://github.com/orgs/community/discussions/26288#discussioncomment-3876281
+# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
+delimiter=$(cat /proc/sys/kernel/random/uuid)
+echo "result<<${delimiter}" >> "${GITHUB_OUTPUT}"
+echo "${RESULT}" >> "${GITHUB_OUTPUT}"
+echo "${delimiter}" >> "${GITHUB_OUTPUT}"

go.mod

@@ -1,30 +1,32 @@
 module github.com/mikefarah/yq/v4
 
 require (
-	github.com/a8m/envsubst v1.3.0
-	github.com/alecthomas/participle/v2 v2.0.0-beta.4
-	github.com/alecthomas/repr v0.1.0
-	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.13.0
-	github.com/goccy/go-json v0.9.10
-	github.com/goccy/go-yaml v1.9.5
-	github.com/jinzhu/copier v0.3.5
-	github.com/magiconair/properties v1.8.6
+	github.com/a8m/envsubst v1.4.2
+	github.com/alecthomas/participle/v2 v2.1.0
+	github.com/alecthomas/repr v0.2.0
+	github.com/dimchansky/utfbom v1.1.1
+	github.com/elliotchance/orderedmap v1.5.0
+	github.com/fatih/color v1.15.0
+	github.com/goccy/go-json v0.10.2
+	github.com/goccy/go-yaml v1.11.2
+	github.com/jinzhu/copier v0.4.0
+	github.com/magiconair/properties v1.8.7
+	github.com/pelletier/go-toml/v2 v2.1.0
 	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
-	github.com/spf13/cobra v1.5.0
-	golang.org/x/net v0.0.0-20220708220712-1185a9018129
+	github.com/spf13/cobra v1.7.0
+	github.com/spf13/pflag v1.0.5
+	golang.org/x/net v0.15.0
+	golang.org/x/text v0.13.0
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 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
-	golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e // indirect
-	golang.org/x/text v0.3.7 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	golang.org/x/sys v0.12.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 )
 
-go 1.18
+go 1.20

go.sum

@@ -1,81 +1,68 @@
-github.com/a8m/envsubst v1.3.0 h1:GmXKmVssap0YtlU3E230W98RWtWCyIZzjtf1apWWyAg=
-github.com/a8m/envsubst v1.3.0/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
-github.com/alecthomas/assert/v2 v2.0.3 h1:WKqJODfOiQG0nEJKFKzDIG3E29CN2/4zR9XGJzKIkbg=
-github.com/alecthomas/participle/v2 v2.0.0-beta.4 h1:ublfGBm+x+p2j7KotHhrUMbKtejT7M0Gv1Mt1u3absw=
-github.com/alecthomas/participle/v2 v2.0.0-beta.4/go.mod h1:RC764t6n4L8D8ITAJv0qdokritYSNR3wV5cVwmIEaMM=
-github.com/alecthomas/repr v0.1.0 h1:ENn2e1+J3k09gyj2shc0dHr/yjaWSHRlrJ4DPMevDqE=
-github.com/alecthomas/repr v0.1.0/go.mod h1:2kn6fqh/zIyPLmm3ugklbEi5hg5wS435eygvNfaDQL8=
+github.com/a8m/envsubst v1.4.2 h1:4yWIHXOLEJHQEFd4UjrWDrYeYlV7ncFWJOCBRLOZHQg=
+github.com/a8m/envsubst v1.4.2/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
+github.com/alecthomas/assert/v2 v2.3.0 h1:mAsH2wmvjsuvyBvAmCtm7zFsBlb8mIHx5ySLVdDZXL0=
+github.com/alecthomas/participle/v2 v2.1.0 h1:z7dElHRrOEEq45F2TG5cbQihMtNTv8vwldytDj7Wrz4=
+github.com/alecthomas/participle/v2 v2.1.0/go.mod h1:Y1+hAs8DHPmc3YUFzqllV+eSQ9ljPTk0ZkPMtEdAx2c=
+github.com/alecthomas/repr v0.2.0 h1:HAzS41CIzNW5syS8Mf9UwXhNH1J9aix/BvDRf1Ml2Yk=
+github.com/alecthomas/repr v0.2.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/elliotchance/orderedmap v1.4.0 h1:wZtfeEONCbx6in1CZyE6bELEt/vFayMvsxqI5SgsR+A=
-github.com/elliotchance/orderedmap v1.4.0/go.mod h1:wsDwEaX5jEoyhbs7x93zk2H/qv0zwuhg4inXhDkYqys=
-github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
-github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
-github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
-github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
-github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
-github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
-github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
-github.com/goccy/go-json v0.9.10 h1:hCeNmprSNLB8B8vQKWl6DpuH0t60oEs+TAk9a7CScKc=
-github.com/goccy/go-json v0.9.10/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
-github.com/goccy/go-yaml v1.9.5 h1:Eh/+3uk9kLxG4koCX6lRMAPS1OaMSAi+FJcya0INdB0=
-github.com/goccy/go-yaml v1.9.5/go.mod h1:U/jl18uSupI5rdI2jmuCswEA2htH9eXfferR3KfscvA=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dimchansky/utfbom v1.1.1 h1:vV6w1AhK4VMnhBno/TPVCoK9U/LP0PkLCS9tbxHdi/U=
+github.com/dimchansky/utfbom v1.1.1/go.mod h1:SxdoEBH5qIqFocHMyGOXVAybYJdr71b1Q/j0mACtrfE=
+github.com/elliotchance/orderedmap v1.5.0 h1:1IsExUsjv5XNBD3ZdC7jkAAqLWOOKdbPTmkHx63OsBg=
+github.com/elliotchance/orderedmap v1.5.0/go.mod h1:wsDwEaX5jEoyhbs7x93zk2H/qv0zwuhg4inXhDkYqys=
+github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
+github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/goccy/go-yaml v1.11.2 h1:joq77SxuyIs9zzxEjgyLBugMQ9NEgTWxXfz2wVqwAaQ=
+github.com/goccy/go-yaml v1.11.2/go.mod h1:wKnAMd44+9JAAnGQpWVEgBzGt3YuTaQ4uXoHvE4m7WU=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
-github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
-github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
-github.com/jinzhu/copier v0.3.5 h1:GlvfUwHk62RokgqVNvYsku0TATCF7bAHVwEXoBh3iJg=
-github.com/jinzhu/copier v0.3.5/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
-github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII=
-github.com/magiconair/properties v1.8.6 h1:5ibWZ6iY0NctNGWo87LalDlEZ6R41TqbbDamhfG/Qzo=
-github.com/magiconair/properties v1.8.6/go.mod h1:y3VJvCyxH9uVvJTWEGAELF3aiYNyPKd5NZ3oSwXrF60=
-github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
-github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
-github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
-github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
-github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
-github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
-github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
+github.com/jinzhu/copier v0.4.0/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
+github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
+github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
+github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/pelletier/go-toml/v2 v2.1.0 h1:FnwAJ4oYMvbT/34k9zzHuZNrhlz48GB3/s6at6/MHO4=
+github.com/pelletier/go-toml/v2 v2.1.0/go.mod h1:tJU2Z3ZkXwnxa4DPO899bsyIoywizdUvyaeZurnPPDc=
 github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e h1:aoZm08cpOy4WuID//EZDgcC4zIxODThtZNPirFr42+A=
 github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/spf13/cobra v1.5.0 h1:X+jTBEBqF0bHN+9cSMgmfuvv2VHJ9ezmFNf9Y/XstYU=
-github.com/spf13/cobra v1.5.0/go.mod h1:dWXEIy2H428czQCjInthrTRUg7yKbok+2Qi/yBIJoUM=
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 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20220708220712-1185a9018129 h1:vucSRfWwTsoXro7P+3Cjlr6flUMtzCwzlvkxEQtHHB0=
-golang.org/x/net v0.0.0-20220708220712-1185a9018129/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e h1:NHvCuwuS43lGnYhten69ZWqi2QOj/CiDNcKbVqwVoew=
-golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
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+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/net v0.15.0 h1:ugBLEUaxABaB5AJqW9enI0ACdci2RUd4eP51NTBvuJ8=
+golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f h1:uF6paiQQebLeSXkrTqHqz0MXhXXS1KgF41eUdBNvxK0=
 golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/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/yaml.v2 v2.2.2/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 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

how-it-works.md

@@ -29,7 +29,7 @@ It pipes the current, lets call it 'root' context through the `lhs` expression o
 cat
 ```
 
-Sidenote: this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
+Side note: 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
 
@@ -37,7 +37,7 @@ 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 (`.b`) to the the LHS (`.a`), 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 LHS (`.a`), and it returns the now updated context:
 
 ```yaml
 a: dog

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, decoder Decoder) error
+	EvaluateFiles(expression string, filenames []string, printer Printer, 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)
@@ -46,21 +46,16 @@ func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCand
 	return context.MatchingNodes, nil
 }
 
-func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error {
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error {
 	fileIndex := 0
-	firstFileLeadingContent := ""
 
 	var allDocuments = list.New()
 	for _, filename := range filenames {
-		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
+		reader, err := readStream(filename)
 		if err != nil {
 			return err
 		}
 
-		if fileIndex == 0 {
-			firstFileLeadingContent = leadingContent
-		}
-
 		fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
 		if err != nil {
 			return err
@@ -75,11 +70,9 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 			Filename:       "",
 			Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
 			FileIndex:      0,
-			LeadingContent: firstFileLeadingContent,
+			LeadingContent: "",
 		}
 		allDocuments.PushBack(candidateNode)
-	} else {
-		allDocuments.Front().Value.(*CandidateNode).LeadingContent = firstFileLeadingContent
 	}
 
 	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)

pkg/yqlib/candidate_node.go

@@ -111,7 +111,7 @@ func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
 		return newPath
 	}
 
-	//don't use append as they may actually modify the path of the orignal node!
+	//don't use append as they may actually modify the path of the original node!
 	newPath := make([]interface{}, len(n.Path)+1)
 	copy(newPath, n.Path)
 	newPath[len(n.Path)] = path
@@ -157,7 +157,7 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	n.Node.Kind = other.Node.Kind
 
 	// don't clobber custom tags...
-	if strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+	if prefs.ClobberCustomTags || strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
 		n.Node.Tag = other.Node.Tag
 	}
 

pkg/yqlib/chown_linux.go

@@ -0,0 +1,25 @@
+//go:build linux
+
+package yqlib
+
+import (
+	"io/fs"
+	"os"
+	"syscall"
+)
+
+func changeOwner(info fs.FileInfo, file *os.File) error {
+	if stat, ok := info.Sys().(*syscall.Stat_t); ok {
+		uid := int(stat.Uid)
+		gid := int(stat.Gid)
+
+		err := os.Chown(file.Name(), uid, gid)
+		if err != nil {
+			// this happens with snap confinement
+			// not really a big issue as users can chown
+			// the file themselves if required.
+			log.Info("Skipping chown: %v", err)
+		}
+	}
+	return nil
+}

pkg/yqlib/chown_not_linux_os.go

@@ -0,0 +1,12 @@
+//go:build !linux
+
+package yqlib
+
+import (
+	"io/fs"
+	"os"
+)
+
+func changeOwner(info fs.FileInfo, file *os.File) error {
+	return nil
+}

pkg/yqlib/csv_test.go

@@ -0,0 +1,290 @@
+package yqlib
+
+import (
+	"bufio"
+	"fmt"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+const csvSimple = `name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+const csvMissing = `name,numberOfCats,likesApples,height
+,null,,168.8
+`
+const expectedUpdatedSimpleCsv = `name,numberOfCats,likesApples,height
+Gary,3,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+
+const csvSimpleShort = `Name,Number of Cats
+Gary,1
+Samantha's Rabbit,2
+`
+
+const tsvSimple = `name	numberOfCats	likesApples	height
+Gary	1	true	168.8
+Samantha's Rabbit	2	false	-188.8
+`
+
+const expectedYamlFromCSV = `- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+`
+
+const expectedYamlFromCSVMissingData = `- name: Gary
+  numberOfCats: 1
+  height: 168.8
+- name: Samantha's Rabbit
+  height: -188.8
+  likesApples: false
+`
+
+const csvSimpleMissingData = `name,numberOfCats,height
+Gary,1,168.8
+Samantha's Rabbit,,-188.8
+`
+
+const csvTestSimpleYaml = `- [i, like, csv]
+- [because, excel, is, cool]`
+
+const expectedSimpleCsv = `i,like,csv
+because,excel,is,cool
+`
+
+const tsvTestExpectedSimpleCsv = `i	like	csv
+because	excel	is	cool
+`
+
+var csvScenarios = []formatScenario{
+	{
+		description:  "Encode CSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     expectedSimpleCsv,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode TSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     tsvTestExpectedSimpleCsv,
+		scenarioType: "encode-tsv",
+	},
+	{
+		description:  "Encode Empty",
+		skipDoc:      true,
+		input:        `[]`,
+		expected:     "",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Comma in value",
+		skipDoc:      true,
+		input:        `["comma, in, value", things]`,
+		expected:     "\"comma, in, value\",things\n",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode array of objects to csv",
+		input:        expectedYamlFromCSV,
+		expected:     csvSimple,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to custom csv format",
+		subdescription: "Add the header row manually, then the we convert each object into an array of values - resulting in an array of arrays. Pick the columns and call the header whatever you like.",
+		input:          expectedYamlFromCSV,
+		expected:       csvSimpleShort,
+		expression:     `[["Name", "Number of Cats"]] +  [.[] | [.name, .numberOfCats ]]`,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to csv - missing fields behaviour",
+		subdescription: "First entry is used to determine the headers, and it is missing 'likesApples', so it is not included in the csv. Second entry does not have 'numberOfCats' so that is blank",
+		input:          expectedYamlFromCSVMissingData,
+		expected:       csvSimpleMissingData,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:  "decode csv missing",
+		skipDoc:      true,
+		input:        csvMissing,
+		expected:     csvMissing,
+		scenarioType: "roundtrip-csv",
+	},
+	{
+		description:    "Parse CSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          csvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-csv-object",
+	},
+	{
+		description:  "Scalar roundtrip",
+		skipDoc:      true,
+		input:        "mike\ncat",
+		expression:   ".[0].mike",
+		expected:     "cat\n",
+		scenarioType: "roundtrip-csv",
+	},
+	{
+		description:    "Parse TSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          tsvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-tsv-object",
+	},
+	{
+		description:  "Round trip",
+		input:        csvSimple,
+		expected:     expectedUpdatedSimpleCsv,
+		expression:   `(.[] | select(.name == "Gary") | .numberOfCats) = 3`,
+		scenarioType: "roundtrip-csv",
+	},
+}
+
+func testCSVScenario(t *testing.T, s formatScenario) {
+	switch s.scenarioType {
+	case "encode-csv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(',')), s.description)
+	case "encode-tsv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder('\t')), s.description)
+	case "decode-csv-object":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(','), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
+	case "decode-tsv-object":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder('\t'), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
+	case "roundtrip-csv":
+		test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewCSVObjectDecoder(','), NewCsvEncoder(',')), s.description)
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func documentCSVDecodeObjectScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+	writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v sample.%v\n```\n", formatType, formatType))
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n",
+		mustProcessFormatScenario(s, NewCSVObjectDecoder(separator), NewYamlEncoder(s.indent, false, ConfiguredYamlPreferences))),
+	)
+}
+
+func documentCSVEncodeScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.yml file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v\n```\n", s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v '%v' sample.yml\n```\n", formatType, expression))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v sample.yml\n```\n", formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		mustProcessFormatScenario(s, NewYamlDecoder(ConfiguredYamlPreferences), NewCsvEncoder(separator))),
+	)
+}
+
+func documentCSVRoundTripScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v '%v' sample.%v\n```\n", formatType, formatType, expression, formatType))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v sample.%v\n```\n", formatType, formatType, formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		mustProcessFormatScenario(s, NewCSVObjectDecoder(separator), NewCsvEncoder(separator))),
+	)
+}
+
+func documentCSVScenario(t *testing.T, w *bufio.Writer, i interface{}) {
+	s := i.(formatScenario)
+	if s.skipDoc {
+		return
+	}
+	switch s.scenarioType {
+	case "encode-csv":
+		documentCSVEncodeScenario(w, s, "csv")
+	case "encode-tsv":
+		documentCSVEncodeScenario(w, s, "tsv")
+	case "decode-csv-object":
+		documentCSVDecodeObjectScenario(w, s, "csv")
+	case "decode-tsv-object":
+		documentCSVDecodeObjectScenario(w, s, "tsv")
+	case "roundtrip-csv":
+		documentCSVRoundTripScenario(w, s, "csv")
+
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func TestCSVScenarios(t *testing.T) {
+	for _, tt := range csvScenarios {
+		testCSVScenario(t, tt)
+	}
+	genericScenarios := make([]interface{}, len(csvScenarios))
+	for i, s := range csvScenarios {
+		genericScenarios[i] = s
+	}
+	documentScenarios(t, "usage", "csv-tsv", genericScenarios, documentCSVScenario)
+}

pkg/yqlib/data_tree_navigator.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	logging "gopkg.in/op/go-logging.v1"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type DataTreeNavigator interface {
@@ -11,6 +12,8 @@ type DataTreeNavigator interface {
 	// this will process the against the given expressionNode and return
 	// a new context of matching candidates
 	GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error)
+
+	DeeplyAssign(context Context, path []interface{}, rhsNode *yaml.Node) error
 }
 
 type dataTreeNavigator struct {
@@ -20,6 +23,27 @@ func NewDataTreeNavigator() DataTreeNavigator {
 	return &dataTreeNavigator{}
 }
 
+func (d *dataTreeNavigator) DeeplyAssign(context Context, path []interface{}, rhsNode *yaml.Node) error {
+
+	rhsCandidateNode := &CandidateNode{
+		Path: path,
+		Node: rhsNode,
+	}
+
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+
+	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
 func (d *dataTreeNavigator) GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error) {
 	if expressionNode == nil {
 		log.Debugf("getMatchingNodes - nothing to do")

pkg/yqlib/decoder.go

@@ -3,8 +3,7 @@ package yqlib
 import (
 	"fmt"
 	"io"
-
-	yaml "gopkg.in/yaml.v3"
+	"strings"
 )
 
 type InputFormat uint
@@ -15,24 +14,50 @@ const (
 	PropertiesInputFormat
 	Base64InputFormat
 	JsonInputFormat
+	CSVObjectInputFormat
+	TSVObjectInputFormat
+	TomlInputFormat
+	UriInputFormat
 )
 
 type Decoder interface {
-	Init(reader io.Reader)
-	Decode(node *yaml.Node) error
+	Init(reader io.Reader) error
+	Decode() (*CandidateNode, error)
 }
 
 func InputFormatFromString(format string) (InputFormat, error) {
 	switch format {
-	case "yaml", "y":
+	case "yaml", "yml", "y":
 		return YamlInputFormat, nil
 	case "xml", "x":
 		return XMLInputFormat, nil
-	case "props", "p":
+	case "properties", "props", "p":
 		return PropertiesInputFormat, nil
 	case "json", "ndjson", "j":
 		return JsonInputFormat, nil
+	case "csv", "c":
+		return CSVObjectInputFormat, nil
+	case "tsv", "t":
+		return TSVObjectInputFormat, nil
+	case "toml":
+		return TomlInputFormat, nil
 	default:
-		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml|props]", format)
+		return 0, fmt.Errorf("unknown format '%v' please use [yaml|json|props|csv|tsv|xml|toml]", format)
 	}
 }
+
+func FormatFromFilename(filename string) string {
+
+	if filename != "" {
+		GetLogger().Debugf("checking file extension '%s' for auto format detection", filename)
+		nPos := strings.LastIndex(filename, ".")
+		if nPos > -1 {
+			format := filename[nPos+1:]
+			GetLogger().Debugf("detected format '%s'", format)
+			return format
+		}
+	}
+
+	GetLogger().Debugf("using default inputFormat 'yaml'")
+	return "yaml"
+}

pkg/yqlib/decoder_base64.go

@@ -4,10 +4,33 @@ import (
 	"bytes"
 	"encoding/base64"
 	"io"
+	"strings"
 
 	yaml "gopkg.in/yaml.v3"
 )
 
+type base64Padder struct {
+	count uint64
+	io.Reader
+}
+
+func (c *base64Padder) pad(buf []byte) (int, error) {
+	pad := strings.Repeat("=", int(4-c.count%4))
+	n, err := strings.NewReader(pad).Read(buf)
+	c.count += uint64(n)
+	return n, err
+}
+
+func (c *base64Padder) Read(buf []byte) (int, error) {
+	n, err := c.Reader.Read(buf)
+	c.count += uint64(n)
+
+	if err == io.EOF && c.count%4 != 0 {
+		return c.pad(buf)
+	}
+	return n, err
+}
+
 type base64Decoder struct {
 	reader       io.Reader
 	finished     bool
@@ -19,21 +42,22 @@ func NewBase64Decoder() Decoder {
 	return &base64Decoder{finished: false, encoding: *base64.StdEncoding}
 }
 
-func (dec *base64Decoder) Init(reader io.Reader) {
-	dec.reader = reader
+func (dec *base64Decoder) Init(reader io.Reader) error {
+	dec.reader = &base64Padder{Reader: reader}
 	dec.readAnything = false
 	dec.finished = false
+	return nil
 }
 
-func (dec *base64Decoder) Decode(rootYamlNode *yaml.Node) error {
+func (dec *base64Decoder) Decode() (*CandidateNode, error) {
 	if dec.finished {
-		return io.EOF
+		return nil, io.EOF
 	}
 	base64Reader := base64.NewDecoder(&dec.encoding, dec.reader)
 	buf := new(bytes.Buffer)
 
 	if _, err := buf.ReadFrom(base64Reader); err != nil {
-		return err
+		return nil, err
 	}
 	if buf.Len() == 0 {
 		dec.finished = true
@@ -42,12 +66,15 @@ func (dec *base64Decoder) Decode(rootYamlNode *yaml.Node) error {
 		// otherwise if we've already read some bytes, and now we get
 		// an empty string, then we are done.
 		if dec.readAnything {
-			return io.EOF
+			return nil, io.EOF
 		}
 	}
 	dec.readAnything = true
-	rootYamlNode.Kind = yaml.ScalarNode
-	rootYamlNode.Tag = "!!str"
-	rootYamlNode.Value = buf.String()
-	return nil
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:  yaml.ScalarNode,
+			Tag:   "!!str",
+			Value: buf.String(),
+		},
+	}, nil
 }

pkg/yqlib/decoder_csv_object.go

@@ -0,0 +1,81 @@
+package yqlib
+
+import (
+	"encoding/csv"
+	"errors"
+	"io"
+
+	"github.com/dimchansky/utfbom"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type csvObjectDecoder struct {
+	separator rune
+	reader    csv.Reader
+	finished  bool
+}
+
+func NewCSVObjectDecoder(separator rune) Decoder {
+	return &csvObjectDecoder{separator: separator}
+}
+
+func (dec *csvObjectDecoder) Init(reader io.Reader) error {
+	cleanReader, enc := utfbom.Skip(reader)
+	log.Debugf("Detected encoding: %s\n", enc)
+	dec.reader = *csv.NewReader(cleanReader)
+	dec.reader.Comma = dec.separator
+	dec.finished = false
+	return nil
+}
+
+func (dec *csvObjectDecoder) convertToYamlNode(content string) *yaml.Node {
+	node, err := parseSnippet(content)
+	if err != nil {
+		return createScalarNode(content, content)
+	}
+	return node
+}
+
+func (dec *csvObjectDecoder) createObject(headerRow []string, contentRow []string) *yaml.Node {
+	objectNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
+
+	for i, header := range headerRow {
+		objectNode.Content = append(
+			objectNode.Content,
+			createScalarNode(header, header),
+			dec.convertToYamlNode(contentRow[i]))
+	}
+	return objectNode
+}
+
+func (dec *csvObjectDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	headerRow, err := dec.reader.Read()
+	log.Debugf(": headerRow%v", headerRow)
+	if err != nil {
+		return nil, err
+	}
+
+	rootArray := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
+
+	contentRow, err := dec.reader.Read()
+
+	for err == nil && len(contentRow) > 0 {
+		log.Debugf("Adding contentRow: %v", contentRow)
+		rootArray.Content = append(rootArray.Content, dec.createObject(headerRow, contentRow))
+		contentRow, err = dec.reader.Read()
+		log.Debugf("Read next contentRow: %v, %v", contentRow, err)
+	}
+	if !errors.Is(err, io.EOF) {
+		return nil, err
+	}
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{rootArray},
+		},
+	}, nil
+}

pkg/yqlib/decoder_json.go

@@ -1,3 +1,5 @@
+//go:build !yq_nojson
+
 package yqlib
 
 import (
@@ -16,63 +18,76 @@ func NewJSONDecoder() Decoder {
 	return &jsonDecoder{}
 }
 
-func (dec *jsonDecoder) Init(reader io.Reader) {
+func (dec *jsonDecoder) Init(reader io.Reader) error {
 	dec.decoder = *json.NewDecoder(reader)
-}
-
-func (dec *jsonDecoder) Decode(rootYamlNode *yaml.Node) error {
-
-	var dataBucket interface{}
-	log.Debug("going to decode")
-	err := dec.decoder.Decode(&dataBucket)
-	if err != nil {
-		return err
-	}
-	node, err := dec.convertToYamlNode(dataBucket)
-
-	if err != nil {
-		return err
-	}
-	rootYamlNode.Kind = yaml.DocumentNode
-	rootYamlNode.Content = []*yaml.Node{node}
 	return nil
 }
 
-func (dec *jsonDecoder) convertToYamlNode(data interface{}) (*yaml.Node, error) {
-	switch data := data.(type) {
-	case nil:
-		return createScalarNode(nil, "null"), nil
-	case float64, float32:
-		// json decoder returns ints as float.
-		return parseSnippet(fmt.Sprintf("%v", data))
-	case int, int64, int32, string, bool:
-		return createScalarNode(data, fmt.Sprintf("%v", data)), nil
-	case map[string]interface{}:
-		return dec.parseMap(data)
-	case []interface{}:
-		return dec.parseArray(data)
-	default:
-		return nil, fmt.Errorf("unrecognised type :(")
+func (dec *jsonDecoder) Decode() (*CandidateNode, error) {
+
+	var dataBucket orderedMap
+	log.Debug("going to decode")
+	err := dec.decoder.Decode(&dataBucket)
+	if err != nil {
+		return nil, err
 	}
+	node, err := dec.convertToYamlNode(&dataBucket)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{node},
+		},
+	}, nil
 }
 
-func (dec *jsonDecoder) parseMap(dataMap map[string]interface{}) (*yaml.Node, error) {
+func (dec *jsonDecoder) convertToYamlNode(data *orderedMap) (*yaml.Node, error) {
+	if data == nil {
+		return createScalarNode(nil, "null"), nil
+	}
+	if data.kv == nil {
+		switch rawData := data.altVal.(type) {
+		case nil:
+			return createScalarNode(nil, "null"), nil
+		case float64, float32:
+			// json decoder returns ints as float.'
+			intNum := int(rawData.(float64))
 
-	var yamlMap = &yaml.Node{Kind: yaml.MappingNode}
+			// if the integer representation is the same as the original
+			// then its an int.
+			if float64(intNum) == rawData.(float64) {
+				return createScalarNode(intNum, fmt.Sprintf("%v", intNum)), nil
+			}
 
-	for key, value := range dataMap {
-		yamlValue, err := dec.convertToYamlNode(value)
+			return createScalarNode(rawData, fmt.Sprintf("%v", rawData)), nil
+		case int, int64, int32, string, bool:
+			return createScalarNode(rawData, fmt.Sprintf("%v", rawData)), nil
+		case []*orderedMap:
+			return dec.parseArray(rawData)
+		default:
+			return nil, fmt.Errorf("unrecognised type :( %v", rawData)
+		}
+	}
+
+	var yamlMap = &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
+	for i, keyValuePair := range data.kv {
+		yamlValue, err := dec.convertToYamlNode(&data.kv[i].V)
 		if err != nil {
 			return nil, err
 		}
-		yamlMap.Content = append(yamlMap.Content, createScalarNode(key, fmt.Sprintf("%v", key)), yamlValue)
+		yamlMap.Content = append(yamlMap.Content, createScalarNode(keyValuePair.K, keyValuePair.K), yamlValue)
 	}
 	return yamlMap, nil
+
 }
 
-func (dec *jsonDecoder) parseArray(dataArray []interface{}) (*yaml.Node, error) {
+func (dec *jsonDecoder) parseArray(dataArray []*orderedMap) (*yaml.Node, error) {
 
-	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode}
+	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
 
 	for _, value := range dataArray {
 		yamlValue, err := dec.convertToYamlNode(value)

pkg/yqlib/decoder_properties.go

@@ -2,6 +2,7 @@ package yqlib
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"strconv"
 	"strings"
@@ -20,9 +21,10 @@ func NewPropertiesDecoder() Decoder {
 	return &propertiesDecoder{d: NewDataTreeNavigator(), finished: false}
 }
 
-func (dec *propertiesDecoder) Init(reader io.Reader) {
+func (dec *propertiesDecoder) Init(reader io.Reader) error {
 	dec.reader = reader
 	dec.finished = false
+	return nil
 }
 
 func parsePropKey(key string) []interface{} {
@@ -46,31 +48,26 @@ func (dec *propertiesDecoder) processComment(c string) string {
 	return "# " + c
 }
 
-func (dec *propertiesDecoder) applyProperty(properties *properties.Properties, context Context, key string) error {
-	value, _ := properties.Get(key)
-	path := parsePropKey(key)
-
-	rhsNode := &yaml.Node{
-		Value:       value,
-		Tag:         "!!str",
-		Kind:        yaml.ScalarNode,
-		LineComment: dec.processComment(properties.GetComment(key)),
-	}
-
-	rhsNode.Tag = guessTagFromCustomType(rhsNode)
+func (dec *propertiesDecoder) applyPropertyComments(context Context, path []interface{}, comments []string) error {
+	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
 
 	rhsCandidateNode := &CandidateNode{
 		Path: path,
-		Node: rhsNode,
+		Node: &yaml.Node{
+			Tag:         "!!str",
+			Value:       fmt.Sprintf("%v", path[len(path)-1]),
+			HeadComment: dec.processComment(strings.Join(comments, "\n")),
+			Kind:        yaml.ScalarNode,
+		},
 	}
 
-	assignmentOp := &Operation{OperationType: assignOpType, Preferences: assignPreferences{}}
+	rhsCandidateNode.Node.Tag = guessTagFromCustomType(rhsCandidateNode.Node)
 
-	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+	rhsOp := &Operation{OperationType: referenceOpType, CandidateNode: rhsCandidateNode}
 
 	assignmentOpNode := &ExpressionNode{
 		Operation: assignmentOp,
-		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		LHS:       createTraversalTree(path, traversePreferences{}, true),
 		RHS:       &ExpressionNode{Operation: rhsOp},
 	}
 
@@ -78,22 +75,45 @@ func (dec *propertiesDecoder) applyProperty(properties *properties.Properties, c
 	return err
 }
 
-func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
+func (dec *propertiesDecoder) applyProperty(context Context, properties *properties.Properties, key string) error {
+	value, _ := properties.Get(key)
+	path := parsePropKey(key)
+
+	propertyComments := properties.GetComments(key)
+	if len(propertyComments) > 0 {
+		err := dec.applyPropertyComments(context, path, propertyComments)
+		if err != nil {
+			return nil
+		}
+	}
+
+	rhsNode := &yaml.Node{
+		Value: value,
+		Tag:   "!!str",
+		Kind:  yaml.ScalarNode,
+	}
+
+	rhsNode.Tag = guessTagFromCustomType(rhsNode)
+
+	return dec.d.DeeplyAssign(context, path, rhsNode)
+}
+
+func (dec *propertiesDecoder) Decode() (*CandidateNode, error) {
 	if dec.finished {
-		return io.EOF
+		return nil, io.EOF
 	}
 	buf := new(bytes.Buffer)
 
 	if _, err := buf.ReadFrom(dec.reader); err != nil {
-		return err
+		return nil, err
 	}
 	if buf.Len() == 0 {
 		dec.finished = true
-		return io.EOF
+		return nil, io.EOF
 	}
 	properties, err := properties.LoadString(buf.String())
 	if err != nil {
-		return err
+		return nil, err
 	}
 	properties.DisableExpansion = true
 
@@ -108,15 +128,18 @@ func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
 	context = context.SingleChildContext(rootMap)
 
 	for _, key := range properties.Keys() {
-		if err := dec.applyProperty(properties, context, key); err != nil {
-			return err
+		if err := dec.applyProperty(context, properties, key); err != nil {
+			return nil, err
 		}
 
 	}
-
-	rootYamlNode.Kind = yaml.DocumentNode
-	rootYamlNode.Content = []*yaml.Node{rootMap.Node}
 	dec.finished = true
-	return nil
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{rootMap.Node},
+		},
+	}, nil
 
 }

pkg/yqlib/decoder_test.go

@@ -3,6 +3,7 @@ package yqlib
 import (
 	"bufio"
 	"bytes"
+	"fmt"
 	"strings"
 )
 
@@ -15,20 +16,20 @@ type formatScenario struct {
 	subdescription string
 	skipDoc        bool
 	scenarioType   string
+	expectedError  string
 }
 
-func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) string {
-
+func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) (string, error) {
 	var output bytes.Buffer
 	writer := bufio.NewWriter(&output)
 
 	if decoder == nil {
-		decoder = NewYamlDecoder()
+		decoder = NewYamlDecoder(ConfiguredYamlPreferences)
 	}
 
 	inputs, err := readDocuments(strings.NewReader(s.input), "sample.yml", 0, decoder)
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 
 	expression := s.expression
@@ -39,22 +40,31 @@ func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) s
 	exp, err := getExpressionParser().ParseExpression(expression)
 
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 
 	context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: inputs}, exp)
 
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 
 	printer := NewPrinter(encoder, NewSinglePrinterWriter(writer))
 	err = printer.PrintResults(context.MatchingNodes)
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 	writer.Flush()
 
-	return output.String()
+	return output.String(), nil
+}
+
+func mustProcessFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) string {
+
+	result, err := processFormatScenario(s, decoder, encoder)
+	if err != nil {
+		panic(fmt.Errorf("Bad scenario %v: %w", s.description, err))
+	}
+	return result
 
 }

pkg/yqlib/decoder_toml.go

@@ -0,0 +1,369 @@
+//go:build !yq_notoml
+
+package yqlib
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+
+	toml "github.com/pelletier/go-toml/v2/unstable"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type tomlDecoder struct {
+	parser   toml.Parser
+	finished bool
+	d        DataTreeNavigator
+	rootMap  *CandidateNode
+}
+
+func NewTomlDecoder() Decoder {
+	return &tomlDecoder{
+		finished: false,
+		d:        NewDataTreeNavigator(),
+	}
+}
+
+func (dec *tomlDecoder) Init(reader io.Reader) error {
+	dec.parser = toml.Parser{}
+	buf := new(bytes.Buffer)
+	_, err := buf.ReadFrom(reader)
+	if err != nil {
+		return err
+	}
+	dec.parser.Reset(buf.Bytes())
+	dec.rootMap = &CandidateNode{
+		Node: &yaml.Node{
+			Kind: yaml.MappingNode,
+			Tag:  "!!map",
+		}}
+	return nil
+}
+
+func (dec *tomlDecoder) getFullPath(tomlNode *toml.Node) []interface{} {
+	path := make([]interface{}, 0)
+	for {
+		path = append(path, string(tomlNode.Data))
+		tomlNode = tomlNode.Next()
+		if tomlNode == nil {
+			return path
+		}
+	}
+}
+
+func (dec *tomlDecoder) processKeyValueIntoMap(rootMap *CandidateNode, tomlNode *toml.Node) error {
+	value := tomlNode.Value()
+	path := dec.getFullPath(value.Next())
+	log.Debug("!!!processKeyValueIntoMap: %v", path)
+
+	valueNode, err := dec.decodeNode(value)
+	if err != nil {
+		return err
+	}
+	context := Context{}
+	context = context.SingleChildContext(rootMap)
+
+	return dec.d.DeeplyAssign(context, path, valueNode)
+}
+
+func (dec *tomlDecoder) decodeKeyValuesIntoMap(rootMap *CandidateNode, tomlNode *toml.Node) (bool, error) {
+	log.Debug("!! DECODE_KV_INTO_MAP -- processing first (current) entry")
+	if err := dec.processKeyValueIntoMap(rootMap, tomlNode); err != nil {
+		return false, err
+	}
+
+	for dec.parser.NextExpression() {
+		nextItem := dec.parser.Expression()
+		log.Debug("!! DECODE_KV_INTO_MAP -- next exp, its a %v", nextItem.Kind)
+
+		if nextItem.Kind == toml.KeyValue {
+			if err := dec.processKeyValueIntoMap(rootMap, nextItem); err != nil {
+				return false, err
+			}
+		} else {
+			// run out of key values
+			log.Debug("! DECODE_KV_INTO_MAP - ok we are done in decodeKeyValuesIntoMap, gota a %v", nextItem.Kind)
+			log.Debug("! DECODE_KV_INTO_MAP - processAgainstCurrentExp = true!")
+			return true, nil
+		}
+	}
+	log.Debug("! DECODE_KV_INTO_MAP - no more things to read in")
+	return false, nil
+}
+
+func (dec *tomlDecoder) createInlineTableMap(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := make([]*yaml.Node, 0)
+	log.Debug("!! createInlineTableMap")
+
+	iterator := tomlNode.Children()
+	for iterator.Next() {
+		child := iterator.Node()
+		if child.Kind != toml.KeyValue {
+			return nil, fmt.Errorf("only keyvalue pairs are supported in inlinetables, got %v instead", child.Kind)
+		}
+
+		keyValues := &CandidateNode{
+			Node: &yaml.Node{
+				Kind: yaml.MappingNode,
+				Tag:  "!!map",
+			},
+		}
+
+		if err := dec.processKeyValueIntoMap(keyValues, child); err != nil {
+			return nil, err
+		}
+
+		content = append(content, keyValues.Node.Content...)
+	}
+
+	return &yaml.Node{
+		Kind:    yaml.MappingNode,
+		Tag:     "!!map",
+		Content: content,
+	}, nil
+}
+
+func (dec *tomlDecoder) createArray(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := make([]*yaml.Node, 0)
+	iterator := tomlNode.Children()
+	for iterator.Next() {
+		child := iterator.Node()
+		yamlNode, err := dec.decodeNode(child)
+		if err != nil {
+			return nil, err
+		}
+		content = append(content, yamlNode)
+	}
+
+	return &yaml.Node{
+		Kind:    yaml.SequenceNode,
+		Tag:     "!!seq",
+		Content: content,
+	}, nil
+
+}
+
+func (dec *tomlDecoder) createStringScalar(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := string(tomlNode.Data)
+	return createScalarNode(content, content), nil
+}
+
+func (dec *tomlDecoder) createBoolScalar(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := string(tomlNode.Data)
+	return createScalarNode(content == "true", content), nil
+}
+
+func (dec *tomlDecoder) createIntegerScalar(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := string(tomlNode.Data)
+	_, num, err := parseInt64(content)
+	return createScalarNode(num, content), err
+}
+
+func (dec *tomlDecoder) createDateTimeScalar(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := string(tomlNode.Data)
+	val, err := parseDateTime(time.RFC3339, content)
+	return createScalarNode(val, content), err
+}
+
+func (dec *tomlDecoder) createFloatScalar(tomlNode *toml.Node) (*yaml.Node, error) {
+	content := string(tomlNode.Data)
+	num, err := strconv.ParseFloat(content, 64)
+	return createScalarNode(num, content), err
+}
+
+func (dec *tomlDecoder) decodeNode(tomlNode *toml.Node) (*yaml.Node, error) {
+	switch tomlNode.Kind {
+	case toml.Key, toml.String:
+		return dec.createStringScalar(tomlNode)
+	case toml.Bool:
+		return dec.createBoolScalar(tomlNode)
+	case toml.Integer:
+		return dec.createIntegerScalar(tomlNode)
+	case toml.DateTime:
+		return dec.createDateTimeScalar(tomlNode)
+	case toml.Float:
+		return dec.createFloatScalar(tomlNode)
+	case toml.Array:
+		return dec.createArray(tomlNode)
+	case toml.InlineTable:
+		return dec.createInlineTableMap(tomlNode)
+	default:
+		return nil, fmt.Errorf("unsupported type %v", tomlNode.Kind)
+	}
+
+}
+
+func (dec *tomlDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+	//
+	// toml library likes to panic
+	var deferredError error
+	defer func() { //catch or finally
+		if r := recover(); r != nil {
+			var ok bool
+			deferredError, ok = r.(error)
+			if !ok {
+				deferredError = fmt.Errorf("pkg: %v", r)
+			}
+		}
+	}()
+
+	log.Debug("ok here we go")
+	var runAgainstCurrentExp = false
+	var err error
+	for runAgainstCurrentExp || dec.parser.NextExpression() {
+
+		if runAgainstCurrentExp {
+			log.Debug("running against current exp")
+		}
+
+		currentNode := dec.parser.Expression()
+
+		log.Debug("currentNode: %v ", currentNode.Kind)
+		runAgainstCurrentExp, err = dec.processTopLevelNode(currentNode)
+		if err != nil {
+			return dec.rootMap, err
+		}
+
+	}
+
+	err = dec.parser.Error()
+	if err != nil {
+		return nil, err
+	}
+
+	// must have finished
+	dec.finished = true
+
+	if len(dec.rootMap.Node.Content) == 0 {
+		return nil, io.EOF
+	}
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{dec.rootMap.Node},
+		},
+	}, deferredError
+
+}
+
+func (dec *tomlDecoder) processTopLevelNode(currentNode *toml.Node) (bool, error) {
+	var runAgainstCurrentExp bool
+	var err error
+	log.Debug("!!!!!!!!!!!!Going to process %v state is current %v", currentNode.Kind, NodeToString(dec.rootMap))
+	if currentNode.Kind == toml.Table {
+		runAgainstCurrentExp, err = dec.processTable((currentNode))
+	} else if currentNode.Kind == toml.ArrayTable {
+		runAgainstCurrentExp, err = dec.processArrayTable((currentNode))
+	} else {
+		runAgainstCurrentExp, err = dec.decodeKeyValuesIntoMap(dec.rootMap, currentNode)
+	}
+
+	log.Debug("!!!!!!!!!!!!DONE Processing state is now %v", NodeToString(dec.rootMap))
+	return runAgainstCurrentExp, err
+}
+
+func (dec *tomlDecoder) processTable(currentNode *toml.Node) (bool, error) {
+	log.Debug("!!! processing table")
+	fullPath := dec.getFullPath(currentNode.Child())
+	log.Debug("!!!fullpath: %v", fullPath)
+
+	hasValue := dec.parser.NextExpression()
+	if !hasValue {
+		return false, fmt.Errorf("error retrieving table %v value: %w", fullPath, dec.parser.Error())
+	}
+
+	tableNodeValue := &CandidateNode{
+		Node: &yaml.Node{
+			Kind: yaml.MappingNode,
+			Tag:  "!!map",
+		},
+	}
+
+	tableValue := dec.parser.Expression()
+	if tableValue.Kind != toml.KeyValue {
+		log.Debug("got an empty table, returning")
+		return true, nil
+	}
+
+	runAgainstCurrentExp, err := dec.decodeKeyValuesIntoMap(tableNodeValue, tableValue)
+	log.Debugf("table node err: %w", err)
+	if err != nil && !errors.Is(io.EOF, err) {
+		return false, err
+	}
+	c := Context{}
+
+	c = c.SingleChildContext(dec.rootMap)
+	err = dec.d.DeeplyAssign(c, fullPath, tableNodeValue.Node)
+	if err != nil {
+		return false, err
+	}
+	return runAgainstCurrentExp, nil
+}
+
+func (dec *tomlDecoder) arrayAppend(context Context, path []interface{}, rhsNode *yaml.Node) error {
+	rhsCandidateNode := &CandidateNode{
+		Path: path,
+		Node: &yaml.Node{
+			Kind:    yaml.SequenceNode,
+			Tag:     "!!seq",
+			Content: []*yaml.Node{rhsNode},
+		},
+	}
+
+	assignmentOp := &Operation{OperationType: addAssignOpType}
+
+	rhsOp := &Operation{OperationType: valueOpType, CandidateNode: rhsCandidateNode}
+
+	assignmentOpNode := &ExpressionNode{
+		Operation: assignmentOp,
+		LHS:       createTraversalTree(path, traversePreferences{}, false),
+		RHS:       &ExpressionNode{Operation: rhsOp},
+	}
+
+	_, err := dec.d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
+func (dec *tomlDecoder) processArrayTable(currentNode *toml.Node) (bool, error) {
+	log.Debug("!!! processing table")
+	fullPath := dec.getFullPath(currentNode.Child())
+	log.Debug("!!!fullpath: %v", fullPath)
+
+	// need to use the array append exp to add another entry to
+	// this array: fullpath += [ thing ]
+
+	hasValue := dec.parser.NextExpression()
+	if !hasValue {
+		return false, fmt.Errorf("error retrieving table %v value: %w", fullPath, dec.parser.Error())
+	}
+
+	tableNodeValue := &CandidateNode{
+		Node: &yaml.Node{
+			Kind: yaml.MappingNode,
+			Tag:  "!!map",
+		},
+	}
+
+	tableValue := dec.parser.Expression()
+	runAgainstCurrentExp, err := dec.decodeKeyValuesIntoMap(tableNodeValue, tableValue)
+	log.Debugf("table node err: %w", err)
+	if err != nil && !errors.Is(io.EOF, err) {
+		return false, err
+	}
+	c := Context{}
+
+	c = c.SingleChildContext(dec.rootMap)
+
+	// += function
+	err = dec.arrayAppend(c, fullPath, tableNodeValue.Node)
+
+	return runAgainstCurrentExp, err
+}

pkg/yqlib/decoder_uri.go

@@ -0,0 +1,60 @@
+package yqlib
+
+import (
+	"bytes"
+	"io"
+	"net/url"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type uriDecoder struct {
+	reader       io.Reader
+	finished     bool
+	readAnything bool
+}
+
+func NewUriDecoder() Decoder {
+	return &uriDecoder{finished: false}
+}
+
+func (dec *uriDecoder) Init(reader io.Reader) error {
+	dec.reader = reader
+	dec.readAnything = false
+	dec.finished = false
+	return nil
+}
+
+func (dec *uriDecoder) Decode() (*CandidateNode, error) {
+	if dec.finished {
+		return nil, io.EOF
+	}
+
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(dec.reader); err != nil {
+		return nil, err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+
+		// if we've read _only_ an empty string, lets return that
+		// otherwise if we've already read some bytes, and now we get
+		// an empty string, then we are done.
+		if dec.readAnything {
+			return nil, io.EOF
+		}
+	}
+	newValue, err := url.QueryUnescape(buf.String())
+	if err != nil {
+		return nil, err
+	}
+	dec.readAnything = true
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:  yaml.ScalarNode,
+			Tag:   "!!str",
+			Value: newValue,
+		},
+	}, nil
+}

pkg/yqlib/decoder_xml.go

@@ -1,9 +1,13 @@
+//go:build !yq_noxml
+
 package yqlib
 
 import (
 	"encoding/xml"
 	"errors"
+	"fmt"
 	"io"
+	"regexp"
 	"strings"
 	"unicode"
 
@@ -12,34 +16,24 @@ import (
 )
 
 type xmlDecoder struct {
-	reader          io.Reader
-	readAnything    bool
-	attributePrefix string
-	contentName     string
-	strictMode      bool
-	keepNamespace   bool
-	useRawToken     bool
-	finished        bool
+	reader       io.Reader
+	readAnything bool
+	finished     bool
+	prefs        XmlPreferences
 }
 
-func NewXMLDecoder(attributePrefix string, contentName string, strictMode bool, keepNamespace bool, useRawToken bool) Decoder {
-	if contentName == "" {
-		contentName = "content"
-	}
+func NewXMLDecoder(prefs XmlPreferences) Decoder {
 	return &xmlDecoder{
-		attributePrefix: attributePrefix,
-		contentName:     contentName,
-		finished:        false,
-		strictMode:      strictMode,
-		keepNamespace:   keepNamespace,
-		useRawToken:     useRawToken,
+		finished: false,
+		prefs:    prefs,
 	}
 }
 
-func (dec *xmlDecoder) Init(reader io.Reader) {
+func (dec *xmlDecoder) Init(reader io.Reader) error {
 	dec.reader = reader
 	dec.readAnything = false
 	dec.finished = false
+	return nil
 }
 
 func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
@@ -55,23 +49,33 @@ func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
 	return yamlNode, nil
 }
 
+var decoderCommentPrefix = regexp.MustCompile(`(^|\n)([[:alpha:]])`)
+
 func (dec *xmlDecoder) processComment(c string) string {
 	if c == "" {
 		return ""
 	}
-	return "#" + strings.TrimRight(c, " ")
+	//need to replace "cat " with "# cat"
+	// "\ncat\n" with "\n cat\n"
+	// ensure non-empty comments starting with newline have a space in front
+
+	replacement := decoderCommentPrefix.ReplaceAllString(c, "$1 $2")
+	replacement = "#" + strings.ReplaceAll(strings.TrimRight(replacement, " "), "\n", "\n#")
+	return replacement
 }
 
 func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
-	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	log.Debug("createMap: headC: %v, lineC: %v, footC: %v", n.HeadComment, n.LineComment, n.FootComment)
 	yamlNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 
 	if len(n.Data) > 0 {
-		label := dec.contentName
+		log.Debugf("creating content node for map: %v", dec.prefs.ContentName)
+		label := dec.prefs.ContentName
 		labelNode := createScalarNode(label, label)
 		labelNode.HeadComment = dec.processComment(n.HeadComment)
+		labelNode.LineComment = dec.processComment(n.LineComment)
 		labelNode.FootComment = dec.processComment(n.FootComment)
-		yamlNode.Content = append(yamlNode.Content, labelNode, createScalarNode(n.Data, n.Data))
+		yamlNode.Content = append(yamlNode.Content, labelNode, dec.createValueNodeFromData(n.Data))
 	}
 
 	for i, keyValuePair := range n.Children {
@@ -82,13 +86,12 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 		var err error
 
 		if i == 0 {
+			log.Debugf("head comment here")
 			labelNode.HeadComment = dec.processComment(n.HeadComment)
 
 		}
-
-		// if i == len(n.Children)-1 {
+		log.Debugf("label=%v, i=%v, keyValuePair.FootComment: %v", label, i, keyValuePair.FootComment)
 		labelNode.FootComment = dec.processComment(keyValuePair.FootComment)
-		// }
 
 		log.Debug("len of children in %v is %v", label, len(children))
 		if len(children) > 1 {
@@ -101,8 +104,16 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 			// 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 = ""
+				if len(children[0].Data) > 0 {
+
+					log.Debug("scalar comment hack, currentlabel [%v]", labelNode.HeadComment)
+					labelNode.HeadComment = joinComments([]string{labelNode.HeadComment, strings.TrimSpace(children[0].HeadComment)}, "\n")
+					children[0].HeadComment = ""
+				} else {
+					// child is null, put the headComment as a linecomment for reasons
+					children[0].LineComment = children[0].HeadComment
+					children[0].HeadComment = ""
+				}
 			}
 			valueNode, err = dec.convertToYamlNode(children[0])
 			if err != nil {
@@ -115,48 +126,75 @@ func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 	return yamlNode, nil
 }
 
+func (dec *xmlDecoder) createValueNodeFromData(values []string) *yaml.Node {
+	switch len(values) {
+	case 0:
+		return createScalarNode(nil, "")
+	case 1:
+		return createScalarNode(values[0], values[0])
+	default:
+		content := make([]*yaml.Node, 0)
+		for _, value := range values {
+			content = append(content, createScalarNode(value, value))
+		}
+		return &yaml.Node{
+			Kind:    yaml.SequenceNode,
+			Tag:     "!!seq",
+			Content: content,
+		}
+	}
+}
+
 func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
 	if len(n.Children) > 0 {
 		return dec.createMap(n)
 	}
-	scalar := createScalarNode(n.Data, n.Data)
-	if n.Data == "" {
-		scalar = createScalarNode(nil, "")
-	}
-	log.Debug("scalar headC: %v, footC: %v", n.HeadComment, n.FootComment)
+
+	scalar := dec.createValueNodeFromData(n.Data)
+
+	log.Debug("scalar (%v), headC: %v, lineC: %v, footC: %v", scalar.Tag, n.HeadComment, n.LineComment, n.FootComment)
 	scalar.HeadComment = dec.processComment(n.HeadComment)
 	scalar.LineComment = dec.processComment(n.LineComment)
+	if scalar.Tag == "!!seq" {
+		scalar.Content[0].HeadComment = scalar.LineComment
+		scalar.LineComment = ""
+	}
+
 	scalar.FootComment = dec.processComment(n.FootComment)
 
 	return scalar, nil
 }
 
-func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+func (dec *xmlDecoder) Decode() (*CandidateNode, error) {
 	if dec.finished {
-		return io.EOF
+		return nil, io.EOF
 	}
 	root := &xmlNode{}
 	// cant use xj - it doesn't keep map order.
 	err := dec.decodeXML(root)
 
 	if err != nil {
-		return err
+		return nil, err
 	}
 	firstNode, err := dec.convertToYamlNode(root)
 
 	if err != nil {
-		return err
+		return nil, err
 	} else if firstNode.Tag == "!!null" {
 		dec.finished = true
 		if dec.readAnything {
-			return io.EOF
+			return nil, io.EOF
 		}
 	}
 	dec.readAnything = true
-	rootYamlNode.Kind = yaml.DocumentNode
-	rootYamlNode.Content = []*yaml.Node{firstNode}
 	dec.finished = true
-	return nil
+
+	return &CandidateNode{
+		Node: &yaml.Node{
+			Kind:    yaml.DocumentNode,
+			Content: []*yaml.Node{firstNode},
+		},
+	}, nil
 }
 
 type xmlNode struct {
@@ -164,7 +202,7 @@ type xmlNode struct {
 	HeadComment string
 	FootComment string
 	LineComment string
-	Data        string
+	Data        []string
 }
 
 type xmlChildrenKv struct {
@@ -205,10 +243,12 @@ type element struct {
 // of the map keys.
 func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 	xmlDec := xml.NewDecoder(dec.reader)
-	xmlDec.Strict = dec.strictMode
+	xmlDec.Strict = dec.prefs.StrictMode
 	// That will convert the charset if the provided XML is non-UTF-8
 	xmlDec.CharsetReader = charset.NewReaderLabel
 
+	started := false
+
 	// Create first element from the root node
 	elem := &element{
 		parent: nil,
@@ -216,7 +256,7 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 	}
 
 	getToken := func() (xml.Token, error) {
-		if dec.useRawToken {
+		if dec.prefs.UseRawToken {
 			return xmlDec.RawToken()
 		}
 		return xmlDec.Token()
@@ -244,17 +284,23 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 
 			// Extract attributes as children
 			for _, a := range se.Attr {
-				if dec.keepNamespace {
+				if dec.prefs.KeepNamespace {
 					if a.Name.Space != "" {
 						a.Name.Local = a.Name.Space + ":" + a.Name.Local
 					}
 				}
-				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
+				elem.n.AddChild(dec.prefs.AttributePrefix+a.Name.Local, &xmlNode{Data: []string{a.Value}})
 			}
 		case xml.CharData:
+
 			// Extract XML data (if any)
-			elem.n.Data = trimNonGraphic(string(se))
-			if elem.n.Data != "" {
+			newBit := trimNonGraphic(string(se))
+			if !started && len(newBit) > 0 {
+				return fmt.Errorf("invalid XML: Encountered chardata [%v] outside of XML node", newBit)
+			}
+
+			if len(newBit) > 0 {
+				elem.n.Data = append(elem.n.Data, newBit)
 				elem.state = "chardata"
 				log.Debug("chardata [%v] for %v", elem.n.Data, elem.label)
 			}
@@ -276,13 +322,22 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 
 			} 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})
+				elem.n.LineComment = joinComments([]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})
+				elem.n.HeadComment = joinComments([]string{elem.n.HeadComment, commentStr}, " ")
 			}
 
+		case xml.ProcInst:
+			if !dec.prefs.SkipProcInst {
+				elem.n.AddChild(dec.prefs.ProcInstPrefix+se.Target, &xmlNode{Data: []string{string(se.Inst)}})
+			}
+		case xml.Directive:
+			if !dec.prefs.SkipDirectives {
+				elem.n.AddChild(dec.prefs.DirectiveName, &xmlNode{Data: []string{string(se)}})
+			}
 		}
+		started = true
 	}
 
 	return nil
@@ -294,22 +349,28 @@ func applyFootComment(elem *element, commentStr string) {
 	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})
+		log.Debug("got a foot comment, putting on last child for %v: [%v]", childKv.K, commentStr)
+		// if it's an array of scalars, put the foot comment on the scalar itself
+		if len(childKv.V) > 0 && len(childKv.V[0].Children) == 0 {
+			nodeToUpdate := childKv.V[len(childKv.V)-1]
+			nodeToUpdate.FootComment = joinComments([]string{nodeToUpdate.FootComment, commentStr}, " ")
+		} else {
+			childKv.FootComment = joinComments([]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})
+		elem.n.FootComment = joinComments([]string{elem.n.FootComment, commentStr}, " ")
 	}
 }
 
-func joinFilter(rawStrings []string) string {
+func joinComments(rawStrings []string, joinStr string) string {
 	stringsToJoin := make([]string, 0)
 	for _, str := range rawStrings {
 		if str != "" {
 			stringsToJoin = append(stringsToJoin, str)
 		}
 	}
-	return strings.Join(stringsToJoin, " ")
+	return strings.Join(stringsToJoin, joinStr)
 }
 
 // trimNonGraphic returns a slice of the string s, with all leading and trailing

pkg/yqlib/decoder_yaml.go

@@ -1,23 +1,143 @@
 package yqlib
 
 import (
+	"bufio"
+	"bytes"
+	"errors"
 	"io"
+	"regexp"
+	"strings"
 
 	yaml "gopkg.in/yaml.v3"
 )
 
 type yamlDecoder struct {
 	decoder yaml.Decoder
+
+	prefs YamlPreferences
+
+	// work around of various parsing issues by yaml.v3 with document headers
+	leadingContent string
+	bufferRead     bytes.Buffer
+
+	readAnything bool
+	firstFile    bool
 }
 
-func NewYamlDecoder() Decoder {
-	return &yamlDecoder{}
+func NewYamlDecoder(prefs YamlPreferences) Decoder {
+	return &yamlDecoder{prefs: prefs, firstFile: true}
 }
 
-func (dec *yamlDecoder) Init(reader io.Reader) {
-	dec.decoder = *yaml.NewDecoder(reader)
+func (dec *yamlDecoder) processReadStream(reader *bufio.Reader) (io.Reader, string, error) {
+	var commentLineRegEx = regexp.MustCompile(`^\s*#`)
+	var yamlDirectiveLineRegEx = regexp.MustCompile(`^\s*%YA`)
+	var sb strings.Builder
+	for {
+		peekBytes, err := reader.Peek(3)
+		if errors.Is(err, io.EOF) {
+			// EOF are handled else where..
+			return reader, sb.String(), nil
+		} else if err != nil {
+			return reader, sb.String(), err
+		} else if string(peekBytes[0]) == "\n" {
+			_, err := reader.ReadString('\n')
+			sb.WriteString("\n")
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else if string(peekBytes) == "---" {
+			_, err := reader.ReadString('\n')
+			sb.WriteString("$yqDocSeparator$\n")
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else if commentLineRegEx.MatchString(string(peekBytes)) || yamlDirectiveLineRegEx.MatchString(string(peekBytes)) {
+			line, err := reader.ReadString('\n')
+			sb.WriteString(line)
+			if errors.Is(err, io.EOF) {
+				return reader, sb.String(), nil
+			} else if err != nil {
+				return reader, sb.String(), err
+			}
+		} else {
+			return reader, sb.String(), nil
+		}
+	}
 }
 
-func (dec *yamlDecoder) Decode(rootYamlNode *yaml.Node) error {
-	return dec.decoder.Decode(rootYamlNode)
+func (dec *yamlDecoder) Init(reader io.Reader) error {
+	readerToUse := reader
+	leadingContent := ""
+	dec.bufferRead = bytes.Buffer{}
+	var err error
+	// if we 'evaluating together' - we only process the leading content
+	// of the first file - this ensures comments from subsequent files are
+	// merged together correctly.
+	if dec.prefs.LeadingContentPreProcessing && (!dec.prefs.EvaluateTogether || dec.firstFile) {
+		readerToUse, leadingContent, err = dec.processReadStream(bufio.NewReader(reader))
+		if err != nil {
+			return err
+		}
+	} else if !dec.prefs.LeadingContentPreProcessing {
+		// if we're not process the leading content
+		// keep a copy of what we've read. This is incase its a
+		// doc with only comments - the decoder will return nothing
+		// then we can read the comments from bufferRead
+		readerToUse = io.TeeReader(reader, &dec.bufferRead)
+	}
+	dec.leadingContent = leadingContent
+	dec.readAnything = false
+	dec.decoder = *yaml.NewDecoder(readerToUse)
+	dec.firstFile = false
+	return nil
+}
+
+func (dec *yamlDecoder) Decode() (*CandidateNode, error) {
+	var dataBucket yaml.Node
+	err := dec.decoder.Decode(&dataBucket)
+	if errors.Is(err, io.EOF) && dec.leadingContent != "" && !dec.readAnything {
+		// force returning an empty node with a comment.
+		dec.readAnything = true
+		return dec.blankNodeWithComment(), nil
+	} else if errors.Is(err, io.EOF) && !dec.prefs.LeadingContentPreProcessing && !dec.readAnything {
+		// didn't find any yaml,
+		// check the tee buffer, maybe there were comments
+		dec.readAnything = true
+		dec.leadingContent = dec.bufferRead.String()
+		if dec.leadingContent != "" {
+			return dec.blankNodeWithComment(), nil
+		}
+		return nil, err
+	} else if err != nil {
+		return nil, err
+	}
+
+	candidateNode := &CandidateNode{
+		Node: &dataBucket,
+	}
+
+	if dec.leadingContent != "" {
+		candidateNode.LeadingContent = dec.leadingContent
+		dec.leadingContent = ""
+	}
+	dec.readAnything = true
+	// move document comments into candidate node
+	// otherwise unwrap drops them.
+	candidateNode.TrailingContent = dataBucket.FootComment
+	dataBucket.FootComment = ""
+	return candidateNode, nil
+}
+
+func (dec *yamlDecoder) blankNodeWithComment() *CandidateNode {
+	return &CandidateNode{
+		Document:       0,
+		Filename:       "",
+		Node:           &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{{Tag: "!!null", Kind: yaml.ScalarNode}}},
+		FileIndex:      0,
+		LeadingContent: dec.leadingContent,
+	}
 }

pkg/yqlib/doc/notification-snippet.md

@@ -1,6 +0,0 @@
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}

pkg/yqlib/doc/operators/add.md

@@ -9,12 +9,6 @@ Add behaves differently according to the type of the LHS:
 Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Concatenate arrays
 Given a sample.yml file of:
 ```yaml
@@ -92,6 +86,23 @@ will output
 a: ['dog', 'cat']
 ```
 
+## Prepend to existing array
+Given a sample.yml file of:
+```yaml
+a:
+  - dog
+```
+then
+```bash
+yq '.a = ["cat"] + .a' sample.yml
+```
+will output
+```yaml
+a:
+  - cat
+  - dog
+```
+
 ## Add new object to array
 Given a sample.yml file of:
 ```yaml

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

@@ -2,12 +2,6 @@
 
 This operator is used to provide alternative (or default) values when a particular expression is either null or false.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## LHS is defined
 Given a sample.yml file of:
 ```yaml
@@ -79,3 +73,36 @@ will output
 cat
 ```
 
+## Update or create - entity exists
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+a: 1
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+a: 2
+```
+
+## Update or create - entity does not exist
+This initialises `a` if it's not present
+
+Given a sample.yml file of:
+```yaml
+b: camel
+```
+then
+```bash
+yq '(.a // (.a = 0)) += 1' sample.yml
+```
+will output
+```yaml
+b: camel
+a: 1
+```
+

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

@@ -5,12 +5,6 @@ Use the `alias` and `anchor` operators to read and write yaml aliases and anchor
 `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.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Merge one map
 see https://yaml.org/type/merge.html
 
@@ -308,7 +302,7 @@ foobar:
 ```
 
 ## Dereference and update a field
-`Use explode with multiply to dereference an object
+Use explode with multiply to dereference an object
 
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/array-to-map.md

@@ -0,0 +1,28 @@
+# Array to Map
+
+Use this operator to convert an array to..a map. The indices are used as map keys, null values in the array are skipped over.
+
+Behind the scenes, this is implemented using reduce:
+
+```
+(.[] | select(. != null) ) as $i ireduce({}; .[$i | key] = $i)
+```
+
+## Simple example
+Given a sample.yml file of:
+```yaml
+cool:
+  - null
+  - null
+  - hello
+```
+then
+```bash
+yq '.cool |= array_to_map' sample.yml
+```
+will output
+```yaml
+cool:
+  2: hello
+```
+

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

@@ -3,15 +3,14 @@
 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.
+Which will set the LHS node values equal 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.
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+This will do a similar thing to the plain form, but the RHS expression is run with _each LHS node as context_. This is useful for updating values based on old values, e.g. increment.
 
-`yq e <exp> <file>`
-{% endhint %}
+
+### Flags
+- `c` clobber custom tags
 
 ## Create yaml file
 Running
@@ -204,7 +203,7 @@ a:
 ```
 
 ## Update node value that has an anchor
-Anchor will remaple
+Anchor will remain
 
 Given a sample.yml file of:
 ```yaml
@@ -235,3 +234,37 @@ a:
     - bogs
 ```
 
+## Custom types are maintained by default
+Given a sample.yml file of:
+```yaml
+a: !cat meow
+b: !dog woof
+```
+then
+```bash
+yq '.a = .b' sample.yml
+```
+will output
+```yaml
+a: !cat woof
+b: !dog woof
+```
+
+## Custom types: clobber
+Use the `c` option to clobber custom tags
+
+Given a sample.yml file of:
+```yaml
+a: !cat meow
+b: !dog woof
+```
+then
+```bash
+yq '.a =c .b' sample.yml
+```
+will output
+```yaml
+a: !dog woof
+b: !dog woof
+```
+

pkg/yqlib/doc/operators/boolean-operators.md

@@ -16,12 +16,6 @@ These are most commonly used with the `select` operator to filter particular nod
 - comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
 - select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## `or` example
 Running
 ```bash
@@ -32,6 +26,24 @@ will output
 true
 ```
 
+## "yes" and "no" are strings
+In the yaml 1.2 standard, support for yes/no as booleans was dropped - they are now considered strings. See '10.2.1.2. Boolean' in https://yaml.org/spec/1.2.2/
+
+Given a sample.yml file of:
+```yaml
+- yes
+- no
+```
+then
+```bash
+yq '.[] | tag' sample.yml
+```
+will output
+```yaml
+!!str
+!!str
+```
+
 ## `and` example
 Running
 ```bash

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

@@ -3,12 +3,6 @@
 This creates an array using the expression between the square brackets.
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Collect empty
 Running
 ```bash

pkg/yqlib/doc/operators/column.md

@@ -2,12 +2,6 @@
 
 Returns the column of the matching node. Starts from 1, 0 indicates there was no column data.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Returns column of _value_ node
 Given a sample.yml file of:
 ```yaml

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

@@ -1,22 +1,18 @@
 # Comment Operators
 
-Use these comment operators to set or retrieve comments.
+Use these comment operators to set or retrieve comments. Note that line comments on maps/arrays are actually set on the _key_ node as opposed to the _value_ (map/array). See below for examples.
 
 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
+This will set the LHS nodes' comments equal 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.
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+This is similar to the plain form, but it evaluates the RHS with _each matching LHS node as context_. 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
+Set the comment on the key node for more reliability (see below).
+
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -30,6 +26,24 @@ will output
 a: cat # single
 ```
 
+## Set line comment of a maps/arrays
+For maps and arrays, you need to set the line comment on the _key_ node. This will also work for scalars.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b: things
+```
+then
+```bash
+yq '(.a | key) line_comment="single"' sample.yml
+```
+will output
+```yaml
+a: # single
+  b: things
+```
+
 ## Use update assign to perform relative updates
 Given a sample.yml file of:
 ```yaml
@@ -46,6 +60,121 @@ a: cat # cat
 b: dog # dog
 ```
 
+## Where is the comment - map key example
+The underlying yaml parser can assign comments in a document to surprising nodes. Use an expression like this to find where you comment is. 'p' indicates the path, 'isKey' is if the node is a map key (as opposed to a map value).
+From this, you can see the 'hello-world-comment' is actually on the 'hello' key
+
+Given a sample.yml file of:
+```yaml
+hello: # hello-world-comment
+  message: world
+```
+then
+```bash
+yq '[... | {"p": path | join("."), "isKey": is_key, "hc": headComment, "lc": lineComment, "fc": footComment}]' sample.yml
+```
+will output
+```yaml
+- p: ""
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello
+  isKey: true
+  hc: ""
+  lc: hello-world-comment
+  fc: ""
+- p: hello
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello.message
+  isKey: true
+  hc: ""
+  lc: ""
+  fc: ""
+- p: hello.message
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+```
+
+## Retrieve comment - map key example
+From the previous example, we know that the comment is on the 'hello' _key_ as a lineComment
+
+Given a sample.yml file of:
+```yaml
+hello: # hello-world-comment
+  message: world
+```
+then
+```bash
+yq '.hello | key | line_comment' sample.yml
+```
+will output
+```yaml
+hello-world-comment
+```
+
+## Where is the comment - array example
+The underlying yaml parser can assign comments in a document to surprising nodes. Use an expression like this to find where you comment is. 'p' indicates the path, 'isKey' is if the node is a map key (as opposed to a map value).
+From this, you can see the 'under-name-comment' is actually on the first child
+
+Given a sample.yml file of:
+```yaml
+name:
+  # under-name-comment
+  - first-array-child
+```
+then
+```bash
+yq '[... | {"p": path | join("."), "isKey": is_key, "hc": headComment, "lc": lineComment, "fc": footComment}]' sample.yml
+```
+will output
+```yaml
+- p: ""
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name
+  isKey: true
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name
+  isKey: false
+  hc: ""
+  lc: ""
+  fc: ""
+- p: name.0
+  isKey: false
+  hc: under-name-comment
+  lc: ""
+  fc: ""
+```
+
+## Retrieve comment - array example
+From the previous example, we know that the comment is on the first child as a headComment
+
+Given a sample.yml file of:
+```yaml
+name:
+  # under-name-comment
+  - first-array-child
+```
+then
+```bash
+yq '.name[0] | headComment' sample.yml
+```
+will output
+```yaml
+under-name-comment
+```
+
 ## Set head comment
 Given a sample.yml file of:
 ```yaml
@@ -62,6 +191,25 @@ will output
 a: cat
 ```
 
+## Set head comment of a map entry
+Given a sample.yml file of:
+```yaml
+f: foo
+a:
+  b: cat
+```
+then
+```bash
+yq '(.a | key) head_comment="single"' sample.yml
+```
+will output
+```yaml
+f: foo
+# single
+a:
+  b: cat
+```
+
 ## Set foot comment, using an expression
 Given a sample.yml file of:
 ```yaml
@@ -98,6 +246,8 @@ Note the use of `...` to ensure key nodes are included.
 
 Given a sample.yml file of:
 ```yaml
+# hi
+
 a: cat # comment
 # great
 b: # key comment
@@ -115,6 +265,8 @@ b:
 ## Get line comment
 Given a sample.yml file of:
 ```yaml
+# welcome!
+
 a: cat # meow
 # have a great day
 ```
@@ -143,6 +295,7 @@ yq '. | head_comment' sample.yml
 will output
 ```yaml
 welcome!
+
 ```
 
 ## Head comment with document split

pkg/yqlib/doc/operators/compare.md

@@ -14,12 +14,6 @@ The following types are currently supported:
 - boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
 - select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Compare numbers (>)
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/contains.md

@@ -1,11 +1,13 @@
 # Contains
 
-This returns `true` if the context contains the passed in parameter, and false otherwise.
+This returns `true` if the context contains the passed in parameter, and false otherwise. For arrays, this will return true if the passed in array is contained within the array. For strings, it will return true if the string is a substring.
 
 {% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
 
-`yq e <exp> <file>`
+_Note_ that, just like jq, when checking if an array of strings `contains` another, this will use `contains` and _not_ equals to check each string. This means an expression like `contains(["cat"])` will return true for an array `["cats"]`.
+
+See the "Array has a subset array" example below on how to check for a subset.
+
 {% endhint %}
 
 ## Array contains array
@@ -26,6 +28,24 @@ will output
 true
 ```
 
+## Array has a subset array
+Subtract the superset array from the subset, if there's anything left, it's not a subset
+
+Given a sample.yml file of:
+```yaml
+- foobar
+- foobaz
+- blarp
+```
+then
+```bash
+yq '["baz", "bar"] - . | length == 0' sample.yml
+```
+will output
+```yaml
+false
+```
+
 ## Object included in array
 Given a sample.yml file of:
 ```yaml

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

@@ -2,12 +2,6 @@
 
 This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Collect empty object
 Running
 ```bash

pkg/yqlib/doc/operators/datetime.md

@@ -3,7 +3,7 @@
 Various operators for parsing and manipulating dates. 
 
 ## Date time formattings
-This uses the golangs built in time library for parsing and formatting date times.
+This uses Golang's built in time library for parsing and formatting date times.
 
 When not specified, the RFC3339 standard is assumed `2006-01-02T15:04:05Z07:00` for parsing.
 
@@ -13,23 +13,17 @@ To specify a custom parsing format, use the `with_dtf` operator. The first param
 yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
 ```
 
-See https://pkg.go.dev/time#pkg-constants for examples of formatting options.
+See the [library docs](https://pkg.go.dev/time#pkg-constants) for examples of formatting options.
 
 
 ## Timezones
-This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
+This uses Golang's built in LoadLocation function to parse timezones strings. See the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
 
 
 ## Durations
-Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
+Durations are parsed using Golang's built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
 
-You can durations to time using the `+` operator.
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+You can add durations to time using the `+` operator.
 
 ## Format: from standard RFC3339 format
 Providing a single parameter assumes a standard RFC3339 datetime format. If the target format is not a valid yaml datetime format, the result will be a string tagged node.
@@ -66,7 +60,7 @@ a: 2001-12-15
 ## Format: get the day of the week
 Given a sample.yml file of:
 ```yaml
-a: 2001-12-15T02:59:43.1Z
+a: 2001-12-15
 ```
 then
 ```bash
@@ -92,6 +86,30 @@ a: cool
 updated: 2021-05-19T01:02:03Z
 ```
 
+## From Unix
+Converts from unix time. Note, you don't have to pipe through the tz operator :)
+
+Running
+```bash
+yq --null-input '1675301929 | from_unix | tz("UTC")'
+```
+will output
+```yaml
+2023-02-02T01:38:49Z
+```
+
+## To Unix
+Converts to unix time
+
+Running
+```bash
+yq --null-input 'now | to_unix'
+```
+will output
+```yaml
+1621386123
+```
+
 ## Timezone: from standard RFC3339 format
 Returns a new datetime in the specified timezone. Specify standard IANA Time Zone format or 'utc', 'local'. When given a single parameter, this assumes the datetime is in RFC3339 format.
 
@@ -156,7 +174,7 @@ a: 2021-01-01T03:10:00Z
 ```
 
 ## Date subtraction
-You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/datetime#date-time-formattings) for more information.
 
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/delete.md

@@ -2,12 +2,6 @@
 
 Deletes matching entries in maps or arrays.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/divide.md

@@ -0,0 +1,61 @@
+# Divide
+
+Divide behaves differently according to the type of the LHS:
+* strings: split by the divider
+* number: arithmetic division
+
+## String split
+Given a sample.yml file of:
+```yaml
+a: cat_meow
+b: _
+```
+then
+```bash
+yq '.c = .a / .b' sample.yml
+```
+will output
+```yaml
+a: cat_meow
+b: _
+c:
+  - cat
+  - meow
+```
+
+## Number division
+The result during division is calculated as a float
+
+Given a sample.yml file of:
+```yaml
+a: 12
+b: 2.5
+```
+then
+```bash
+yq '.a = .a / .b' sample.yml
+```
+will output
+```yaml
+a: 4.8
+b: 2.5
+```
+
+## Number division by zero
+Dividing by zero results in +Inf or -Inf
+
+Given a sample.yml file of:
+```yaml
+a: 1
+b: -1
+```
+then
+```bash
+yq '.a = .a / 0 | .b = .b / 0' sample.yml
+```
+will output
+```yaml
+a: !!float +Inf
+b: !!float -Inf
+```
+

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

@@ -2,12 +2,6 @@
 
 Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Retrieve a document index
 Given a sample.yml file of:
 ```yaml

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

@@ -9,27 +9,23 @@ These operators are useful to process yaml documents that have stringified embed
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
-| Yaml | from_yaml | to_yaml(i)/@yaml |
-| JSON | from_json | to_json(i)/@json |
-| Properties | from_props  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
-| XML | from_xml | to_xml(i)/@xml |
+| Yaml | from_yaml/@yamld | to_yaml(i)/@yaml |
+| JSON | from_json/@jsond | to_json(i)/@json |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
+| XML | from_xml/@xmld | to_xml(i)/@xml |
 | Base64 | @base64d | @base64 |
+| URI | @urid | @uri |
+| Shell |  | @sh |
 
 
-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). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 
 
-Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a string.
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a utf-8 string and not binary content.
 
 ## Encode value as json string
 Given a sample.yml file of:
@@ -132,7 +128,7 @@ a: |-
 ```
 then
 ```bash
-yq '.a |= from_props' sample.yml
+yq '.a |= @propsd' sample.yml
 ```
 will output
 ```yaml
@@ -141,6 +137,42 @@ a:
   dogs: cool as well
 ```
 
+## Decode csv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats,dogs
+  great,cool as well
+```
+then
+```bash
+yq '.a |= @csvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
+## Decode tsv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats	dogs
+  great	cool as well
+```
+then
+```bash
+yq '.a |= @tsvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
 ## Encode value as yaml string
 Indent defaults to 2
 
@@ -277,7 +309,7 @@ cat,"thing1,thing2",true,3.40
 dog,thing3,false,12
 ```
 
-## Encode array of array scalars as tsv string
+## Encode array of arrays as tsv string
 Scalars are strings, numbers and booleans.
 
 Given a sample.yml file of:
@@ -307,7 +339,7 @@ Given a sample.yml file of:
 a:
   cool:
     foo: bar
-    +id: hi
+    +@id: hi
 ```
 then
 ```bash
@@ -327,7 +359,7 @@ Given a sample.yml file of:
 a:
   cool:
     foo: bar
-    +id: hi
+    +@id: hi
 ```
 then
 ```bash
@@ -345,7 +377,7 @@ Given a sample.yml file of:
 a:
   cool:
     foo: bar
-    +id: hi
+    +@id: hi
 ```
 then
 ```bash
@@ -405,6 +437,50 @@ will output
 YTogYXBwbGUK
 ```
 
+## Encode a string to uri
+Given a sample.yml file of:
+```yaml
+coolData: this has & special () characters *
+```
+then
+```bash
+yq '.coolData | @uri' sample.yml
+```
+will output
+```yaml
+this+has+%26+special+%28%29+characters+%2A
+```
+
+## Decode a URI to a string
+Given a sample.yml file of:
+```yaml
+this+has+%26+special+%28%29+characters+%2A
+```
+then
+```bash
+yq '@urid' sample.yml
+```
+will output
+```yaml
+this has & special () characters *
+```
+
+## Encode a string to sh
+Sh/Bash friendly string
+
+Given a sample.yml file of:
+```yaml
+coolData: strings with spaces and a 'quote'
+```
+then
+```bash
+yq '.coolData | @sh' sample.yml
+```
+will output
+```yaml
+strings' with spaces and a '\'quote\'
+```
+
 ## Decode a base64 encoded string
 Decoded data is assumed to be a string.
 

pkg/yqlib/doc/operators/entries.md

@@ -2,12 +2,6 @@
 
 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.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## to_entries Map
 Given a sample.yml file of:
 ```yaml
@@ -73,7 +67,7 @@ a: 1
 b: 2
 ```
 
-## from_entries with numeric key indexes
+## from_entries with numeric key indices
 from_entries always creates a map, even for numeric keys
 
 Given a sample.yml file of:
@@ -107,6 +101,26 @@ KEY_a: 1
 KEY_b: 2
 ```
 
+## Custom sort map keys
+Use to_entries to convert to an array of key/value pairs, sort the array using sort/sort_by/etc, and convert it back.
+
+Given a sample.yml file of:
+```yaml
+a: 1
+c: 3
+b: 2
+```
+then
+```bash
+yq 'to_entries | sort_by(.key) | reverse | from_entries' sample.yml
+```
+will output
+```yaml
+c: 3
+b: 2
+a: 1
+```
+
 ## Use with_entries to filter the map
 Given a sample.yml file of:
 ```yaml

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

@@ -30,12 +30,6 @@ yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
 ```
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Read string environment variable
 Running
 ```bash

pkg/yqlib/doc/operators/equals.md

@@ -21,12 +21,6 @@ The not equals `!=` operator returns `false` if the LHS is equal to the RHS.
 - select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
 
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Match string
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/error.md

@@ -2,12 +2,6 @@
 
 Use this operation to short-circuit expressions. Useful for validation.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Validate a particular value
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/eval.md

@@ -2,15 +2,9 @@
 
 Use `eval` to dynamically process an expression - for instance from an environment variable.
 
-`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, beit a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
+`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, be it a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
 
-Tip: This can be useful way parameterise complex scripts.
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+Tip: This can be a useful way to parameterise complex scripts.
 
 ## Dynamically evaluate a path
 Given a sample.yml file of:

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

@@ -10,12 +10,6 @@ Note the use of eval-all to ensure all documents are loaded into memory.
 yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Get filename
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/filter.md

@@ -0,0 +1,42 @@
+# Filter
+
+Filters an array (or map values) by the expression given. Equivalent to doing `map(select(exp))`.
+
+
+## Filter array
+Given a sample.yml file of:
+```yaml
+- 1
+- 2
+- 3
+```
+then
+```bash
+yq 'filter(. < 3)' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+```
+
+## Filter map values
+Given a sample.yml file of:
+```yaml
+c:
+  things: cool
+  frog: yes
+d:
+  things: hot
+  frog: false
+```
+then
+```bash
+yq 'filter(.things == "cool")' sample.yml
+```
+will output
+```yaml
+- things: cool
+  frog: yes
+```
+

pkg/yqlib/doc/operators/flatten.md

@@ -1,12 +1,6 @@
 # Flatten
 This recursively flattens arrays.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Flatten
 Recursively flattens all arrays
 

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

@@ -2,12 +2,6 @@
 
 This is used to group items in an array by an expression.
 
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
-
 ## Group by field
 Given a sample.yml file of:
 ```yaml
@@ -32,7 +26,7 @@ will output
     bar: 100
 ```
 
-## Group by field, with nuls
+## Group by field, with nulls
 Given a sample.yml file of:
 ```yaml
 - cat: dog

pkg/yqlib/doc/operators/has.md

@@ -1,12 +1,6 @@
 # Has
 
-This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
-
-{% hint style="warning" %}
-Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
-
-`yq e <exp> <file>`
-{% endhint %}
+This operation 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:

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

@@ -26,7 +26,7 @@ yq '.a.b[0].c' file.yaml
 cat file.yaml | yq '.a.b[0].c'
 ```
 
-## Update a yaml file, inplace
+## Update a yaml file, in place
 ```bash
 yq -i '.a.b[0].c = "cool"' file.yaml
 ```

pkg/yqlib/doc/operators/headers/array-to-map.md

@@ -0,0 +1,9 @@
+# Array to Map
+
+Use this operator to convert an array to..a map. The indices are used as map keys, null values in the array are skipped over.
+
+Behind the scenes, this is implemented using reduce:
+
+```
+(.[] | select(. != null) ) as $i ireduce({}; .[$i | key] = $i)
+```

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

@@ -3,7 +3,11 @@
 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.
+Which will set the LHS node values equal 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.
+This will do a similar thing to the plain form, but the RHS expression is run with _each LHS node as context_. This is useful for updating values based on old values, e.g. increment.
+
+
+### Flags
+- `c` clobber custom tags

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

@@ -1,11 +1,11 @@
 # Comment Operators
 
-Use these comment operators to set or retrieve comments.
+Use these comment operators to set or retrieve comments. Note that line comments on maps/arrays are actually set on the _key_ node as opposed to the _value_ (map/array). See below for examples.
 
 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
+This will set the LHS nodes' comments equal 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.
+This is similar to the plain form, but it evaluates the RHS with _each matching LHS node as context_. 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

@@ -1,3 +1,11 @@
 # Contains
 
-This returns `true` if the context contains the passed in parameter, and false otherwise.
+This returns `true` if the context contains the passed in parameter, and false otherwise. For arrays, this will return true if the passed in array is contained within the array. For strings, it will return true if the string is a substring.
+
+{% hint style="warning" %}
+
+_Note_ that, just like jq, when checking if an array of strings `contains` another, this will use `contains` and _not_ equals to check each string. This means an expression like `contains(["cat"])` will return true for an array `["cats"]`.
+
+See the "Array has a subset array" example below on how to check for a subset.
+
+{% endhint %}

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

@@ -3,7 +3,7 @@
 Various operators for parsing and manipulating dates. 
 
 ## Date time formattings
-This uses the golangs built in time library for parsing and formatting date times.
+This uses Golang's built in time library for parsing and formatting date times.
 
 When not specified, the RFC3339 standard is assumed `2006-01-02T15:04:05Z07:00` for parsing.
 
@@ -13,14 +13,14 @@ To specify a custom parsing format, use the `with_dtf` operator. The first param
 yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
 ```
 
-See https://pkg.go.dev/time#pkg-constants for examples of formatting options.
+See the [library docs](https://pkg.go.dev/time#pkg-constants) for examples of formatting options.
 
 
 ## Timezones
-This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
+This uses Golang's built in LoadLocation function to parse timezones strings. See the [library docs](https://pkg.go.dev/time#LoadLocation) for more details.
 
 
 ## Durations
-Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
+Durations are parsed using Golang's built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
 
-You can durations to time using the `+` operator.
+You can add durations to time using the `+` operator.

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

@@ -0,0 +1,5 @@
+# Divide
+
+Divide behaves differently according to the type of the LHS:
+* strings: split by the divider
+* number: arithmetic division

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

@@ -9,18 +9,20 @@ These operators are useful to process yaml documents that have stringified embed
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
-| Yaml | from_yaml | to_yaml(i)/@yaml |
-| JSON | from_json | to_json(i)/@json |
-| Properties | from_props  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
-| XML | from_xml | to_xml(i)/@xml |
+| Yaml | from_yaml/@yamld | to_yaml(i)/@yaml |
+| JSON | from_json/@jsond | to_json(i)/@json |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
+| XML | from_xml/@xmld | to_xml(i)/@xml |
 | Base64 | @base64d | @base64 |
+| URI | @urid | @uri |
+| Shell |  | @sh |
 
 
-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). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 
 
-Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a string.
+Base64 assumes [rfc4648](https://rfc-editor.org/rfc/rfc4648.html) encoding. Encoding and decoding both assume that the content is a utf-8 string and not binary content.

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

@@ -2,6 +2,6 @@
 
 Use `eval` to dynamically process an expression - for instance from an environment variable.
 
-`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, beit a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
+`eval` takes a single argument, and evaluates that as a `yq` expression. Any valid expression can be used, be it a path `.a.b.c | select(. == "cat")`, or an update `.a.b.c = "gogo"`.
 
-Tip: This can be useful way parameterise complex scripts.
+Tip: This can be a useful way to parameterise complex scripts.

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

@@ -0,0 +1,4 @@
+# Filter
+
+Filters an array (or map values) by the expression given. Equivalent to doing `map(select(exp))`.
+