Switched formatScenario parameter order for more readablity

Refactored XML test to use common functions
Fixed property decode for github actions
2026-08-24 16:39:58 +08:00 · 2022-02-10 11:57:37 +11:00 · 2022-02-10 11:49:45 +11:00 · 2022-02-10 11:34:33 +11:00 · 2022-02-09 13:31:51 +11:00 · 2022-02-09 13:16:59 +11:00
244 changed files with 6170 additions and 1435 deletions
@@ -26,7 +26,7 @@ country: Australia
 And we run a command:

 ```bash
-yq eval 'predictWeatherOf(.country)'
+yq 'predictWeatherOf(.country)'
 ```

 it could output
@@ -25,6 +25,7 @@ jobs:
        fi

    - name: Check the build
+      shell: bash -l {0}
      run: |
        export PATH=${PATH}:`go env GOPATH`/bin
        scripts/devtools.sh
@@ -48,4 +48,8 @@ test*.yml

 # man page
 man.md
-yq.1
+yq.1
+
+# debian pkg
+_build
+debian/files
@@ -18,6 +18,14 @@ linters:
    - revive
    - unconvert
    - unparam
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      - io/ioutil
+    packages-with-error-message:
+      - io/ioutil: "The 'io/ioutil' package is deprecated. Use corresponding 'os' or 'io' functions instead."
 issues:
  exclude-rules:
  - linters:
@@ -1,3 +1,5 @@
+The MIT License (MIT)
+
 Copyright (c) 2017 Mike Farah

 Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -3,40 +3,67 @@
 ![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq)


-a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
+a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json and xml. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.

 yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker 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 longers 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 multiple files).
+
+TLDR:
+
+Prior to 4.18.1 
+```bash
+cat file.yaml | yq e '.cool' -
+```
+
+4.18+ 
+```bash
+cat file.yaml | yq '.cool'
+```
+
+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:
 ```bash
-yq e '.a.b[0].c' file.yaml
+yq '.a.b[0].c' file.yaml
 ```

 Pipe from STDIN:
 ```bash
-cat file.yaml | yq e '.a.b[0].c' -
+cat file.yaml | yq '.a.b[0].c'
 ```

 Update a yaml file, inplace
 ```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
+yq -i '.a.b[0].c = "cool"' file.yaml
 ```

 Update using environment variables
 ```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
 ```

 Merge multiple files
-```
+```bash
+# note the use of `ea` to evaluate all the files at once
+# instead of in sequence
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```

+
 Multiple updates to a yaml file
 ```bash
-yq e -i '
+yq -i '
  .a.b[0].c = "cool" |
  .x.y.z = "foobar" |
  .person.name = strenv(NAME)
@@ -82,16 +109,16 @@ snap install yq
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:

 ```
-sudo cat /etc/myfile | yq e '.a.path' - 
+sudo cat /etc/myfile | yq '.a.path'
 ```

 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
@@ -101,11 +128,14 @@ rm /etc/myfile.tmp
 #### Oneshot use:

 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```

+Note that you can run `yq` in docker without network access and other privileges if you desire,
+namely `--security-opt=no-new-privileges --cap-drop all --network none`.
+
 ```bash
-podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
+podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression ]FILE...
 ```

 #### Pipe in via STDIN:
@@ -113,11 +143,11 @@ podman run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression
 You'll need to pass the `-i\--interactive` flag to docker:

 ```bash
-cat myfile.yml | docker run -i --rm mikefarah/yq e . -
+cat myfile.yml | docker run -i --rm mikefarah/yq '.this.thing'
 ```

 ```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq e . -
+cat myfile.yml | podman run -i --rm mikefarah/yq '.this.thing'
 ```

 #### Run commands interactively:
@@ -173,7 +203,7 @@ USER yq
  - name: Set foobar to cool
    uses: mikefarah/yq@master
    with:
-      cmd: yq eval -i '.foo.bar = "cool"' 'config.yml'
+      cmd: yq -i '.foo.bar = "cool"' 'config.yml'
 ```

 See https://mikefarah.gitbook.io/yq/usage/github-action for more.
@@ -195,6 +225,12 @@ webi yq
 See [webi](https://webinstall.dev/)
 Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)

+### Arch Linux
+
+```
+pacman -S go-yq
+```
+
 ### Windows:
 [![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
 [![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
@@ -232,19 +268,21 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 ## Features
 - [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
- Uses similar syntax as `jq` but works with YAML and JSON files
+- Uses similar syntax as `jq` but works with YAML, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
 - Fully supports multi document yaml files
 - Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
 - Colorized yaml output
- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
+- [Deeply data structures](https://mikefarah.gitbook.io/yq/operators/traverse-read)
+- [Sort keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
 - Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Update inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
 - [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
 - [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
 - [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
 - [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
+- [Convert to csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
 - [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
 - [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
@@ -259,28 +297,41 @@ Usage:
  yq [flags]
  yq [command]

+Examples:
+
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+cat myfile.yml | yq '.stuff' # outputs the data at the "stuff" node from "myfile.yml"
+
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+
+
 Available Commands:
-  eval             Apply the expression to each document in each yaml file in sequence
+  completion       Generate the autocompletion script for the specified shell
+  eval             (default) Apply the expression to each document in each yaml file in sequence
  eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
  help             Help about any command
  shell-completion Generate completion script

 Flags:
-  -C, --colors                force print with colors
-  -e, --exit-status           set exit status if there are no matches or null or false is returned
-  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
-      --header-preprocess     Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
-  -h, --help                  help for yq
-  -I, --indent int            sets indent level for output (default 2)
-  -i, --inplace               update the yaml file inplace of first yaml file given.
-  -M, --no-colors             force print with no colors
-  -N, --no-doc                Don't print document separators (---)
-  -n, --null-input            Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-  -o, --output-format string  [yaml|y|json|j|props|p] output format type. (default "yaml")
-  -P, --prettyPrint           pretty print, shorthand for '... style = ""'
-      --unwrapScalar          unwrap scalar, print the value with no quotes, colors or comments (default true)
-  -v, --verbose               verbose mode
-  -V, --version               Print version information and quit
+  -C, --colors                        force print with colors
+  -e, --exit-status                   set exit status if there are no matches or null or false is returned
+  -f, --front-matter string           (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
+      --header-preprocess             Slurp any header comments and separators before processing expression. (default true)
+  -h, --help                          help for yq
+  -I, --indent int                    sets indent level for output (default 2)
+  -i, --inplace                       update the file inplace of first file given.
+  -p, --input-format string           [yaml|y|xml|x] parse format for input. Note that json is a subset of yaml. (default "yaml")
+  -M, --no-colors                     force print with no colors
+  -N, --no-doc                        Don't print document separators (---)
+  -n, --null-input                    Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.
+  -o, --output-format string          [yaml|y|json|j|props|p|xml|x] output format type. (default "yaml")
+  -P, --prettyPrint                   pretty print, shorthand for '... style = ""'
+  -s, --split-exp string              print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.
+      --unwrapScalar                  unwrap scalar, print the value with no quotes, colors or comments (default true)
+  -v, --verbose                       verbose mode
+  -V, --version                       Print version information and quit
+      --xml-attribute-prefix string   prefix for xml attributes (default "+")
+      --xml-content-name string       name for xml content (if no attribute name is present). (default "+content")

 Use "yq [command] --help" for more information about a command.
 ```
@@ -1,12 +1,147 @@
 #!/bin/bash

 setUp() {
-  rm test*.yml || true
+  rm test*.yml 2>/dev/null || true
+  rm .xyz 2>/dev/null || true
 }

 testBasicEvalRoundTrip() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicPipeWithDot() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat test.yml | ./yq '.')
+  assertEquals "a: 123" "$X"
+}
+
+testBasicExpressionMatchesFileName() {
+  ./yq -n ".xyz = 123" > test.yml
+  touch .xyz
+  
+  X=$(./yq --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(./yq ea --expression '.xyz' test.yml)
+  assertEquals "123" "$X"
+
+}
+
+testBasicGitHubAction() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq e test.yml)
+  assertEquals "a: 123" "$X"
+
+  X=$(cat /dev/null | ./yq ea test.yml)
+  assertEquals "a: 123" "$X"
+}
+
+testBasicGitHubActionWithExpression() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat /dev/null | ./yq '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq e '.a' test.yml)
+  assertEquals "123" "$X"
+
+  X=$(cat /dev/null | ./yq ea '.a' test.yml)
+  assertEquals "123" "$X"
+}
+
+
+testBasicEvalAllAllFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(./yq ea test.yml test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicCatWithFilesNoDash() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllCatWithFilesNoDash() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea test2.yml)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllCatWithFilesNoDashWithExp() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea '.a' test2.yml)
+  Y=$(./yq e '.a' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+
+testBasicStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFiles() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea - test2.yml)
+  Y=$(./yq e '.' test.yml test2.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalAllStdInWithFilesReverse() {
+  ./yq -n ".a = 123" > test.yml
+  ./yq -n ".a = 124" > test2.yml
+  X=$(cat test.yml | ./yq ea test2.yml -)
+  Y=$(./yq e '.' test2.yml test.yml)
+  assertEquals "$Y" "$X"
+}
+
+testBasicEvalRoundTripNoEval() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals 123 "$X"
+}
+
+testBasicStdInWithOneArg() {
  ./yq e -n ".a = 123" > test.yml
-  X=$(./yq e '.a' test.yml)
+  X=$(cat test.yml | ./yq e ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ea ".a")
+  assertEquals 123 "$X"
+
+  X=$(cat test.yml | ./yq ".a")
  assertEquals 123 "$X"
 }

@@ -19,6 +154,15 @@ EOL
  assertEquals "10" "$X"
 }

+testBasicUpdateInPlaceSequenceNoEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  ./yq -i ".a = 10" test.yml
+  X=$(./yq '.a' test.yml)
+  assertEquals "10" "$X"
+}
+
 testBasicUpdateInPlaceSequenceEvalAll() {
  cat >test.yml <<EOL
 a: 0
@@ -40,6 +184,12 @@ testBasicExitStatus() {
  assertEquals 1 "$?"
 }

+testBasicExitStatusNoEval() {
+  echo "a: cat" > test.yml
+  X=$(./yq -e '.z' test.yml 2&>/dev/null)
+  assertEquals 1 "$?"
+}
+
 testBasicExtractFieldWithSeperator() {
    cat >test.yml <<EOL
 ---
@@ -0,0 +1,79 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml 2>/dev/null || true
+  rm test*.properties 2>/dev/null || true
+  rm test*.xml 2>/dev/null || true
+}
+
+testInputProperties() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputPropertiesGitHubAction() {
+  cat >test.properties <<EOL
+mike.things = hello
+EOL
+
+  read -r -d '' expected << EOM
+mike:
+  things: hello
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=props test.properties)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=props test.properties)
+  assertEquals "$expected" "$X"
+}
+
+testInputXml() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +legs: "4"
+EOM
+
+  X=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testInputXmlGithubAction() {
+  cat >test.yml <<EOL
+<cat legs="4">BiBi</cat>
+EOL
+
+  read -r -d '' expected << EOM
+cat:
+  +content: BiBi
+  +legs: "4"
+EOM
+
+  X=$(cat /dev/null | ./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(cat /dev/null | ./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+source ./scripts/shunit2
@@ -102,4 +102,65 @@ EOM
  assertEquals "$expected" "$X"
 }

+testOutputXml() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmlShort() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat"]}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b>
+    <c>cat</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputXmComplex() {
+  cat >test.yml <<EOL
+a: {b: {c: ["cat", "dog"], +f: meow}}
+EOL
+
+  read -r -d '' expected << EOM
+<a>
+  <b f="meow">
+    <c>cat</c>
+    <c>dog</c>
+  </b>
+</a>
+EOM
+
+  X=$(./yq e --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea --output-format=x test.yml)
+  assertEquals "$expected" "$X"
+}
+
 source ./scripts/shunit2
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+a: frog
+EOL
+}
+
+testPipeViaCatWithParam() {
+  X=$(cat test.yml | ./yq '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEval() {
+  X=$(cat test.yml | ./yq e '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEvalAll() {
+  X=$(cat test.yml | ./yq ea '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatNoParam() {
+  X=$(cat test.yml | ./yq)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEval() {
+  X=$(cat test.yml | ./yq e)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEvalAll() {
+  X=$(cat test.yml | ./yq ea)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishWithParam() {
+  X=$(./yq '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEval() {
+  X=$(./yq e '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEvalAll() {
+  X=$(./yq ea '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishNoParam() {
+  X=$(./yq < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEval() {
+  X=$(./yq e < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEvalAll() {
+  X=$(./yq ea < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+source ./scripts/shunit2
@@ -1,83 +0,0 @@
-package cmd
-
-// import (
-// 	"strings"
-// 	"testing"
-
-// 	"github.com/mikefarah/yq/v3/test"
-// 	"github.com/spf13/cobra"
-// )
-
-// func getRootCommand() *cobra.Command {
-// 	return New()
-// }
-
-// func TestRootCmd(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "Usage:") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_Help(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--help")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !strings.Contains(result.Output, "yq is a lightweight and portable command-line YAML processor. It aims to be the jq or sed of yaml files.") {
-// 		t.Error("Expected usage message to be printed out, but the usage message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VerboseLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--verbose")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VerboseShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-v")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-
-// 	if !verbose {
-// 		t.Error("Expected verbose to be true")
-// 	}
-// }
-
-// func TestRootCmd_VersionShort(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "-V")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }
-
-// func TestRootCmd_VersionLong(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "--version")
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	if !strings.Contains(result.Output, "yq version") {
-// 		t.Error("expected version message to be printed out, but the message was not found.")
-// 	}
-// }
@@ -6,6 +6,10 @@ var unwrapScalar = true
 var writeInplace = false
 var outputToJSON = false
 var outputFormat = "yaml"
+var inputFormat = "yaml"
+
+var xmlAttributePrefix = "+"
+var xmlContentName = "+content"

 var exitStatus = false
 var forceColor = false
@@ -24,3 +28,5 @@ var frontMatter = ""
 var splitFileExp = ""

 var completedSuccessfully = false
+
+var forceExpression = ""
@@ -39,7 +39,7 @@ Note that it consumes more memory than eval.
 	}
 	return cmdEvalAll
 }
-func evaluateAll(cmd *cobra.Command, args []string) error {
+func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -54,6 +54,22 @@ func evaluateAll(cmd *cobra.Command, args []string) error {

 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
+
+	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
+	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
+	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
+	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
+	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
+	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
+	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
+	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
+	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
+	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
+	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
+	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
+	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
+	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)

 	out := cmd.OutOrStdout()

@@ -67,7 +83,11 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}

 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -75,9 +95,18 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		return err
 	}

-	printerWriter := configurePrinterWriter(format, out)
+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}

-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)
+
+	printer := yqlib.NewPrinter(encoder, printerWriter)

 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
@@ -96,22 +125,20 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	}

 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
+
+	expression, args := processArgs(pipingStdIn, args)
+	yqlib.GetLogger().Debugf("processed args: %v", args)
+
 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+		if nullInput {
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(expression), printer, "")
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
-		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
 	}

 	completedSuccessfully = err == nil
@@ -13,7 +13,7 @@ func createEvaluateSequenceCommand() *cobra.Command {
 	var cmdEvalSequence = &cobra.Command{
 		Use:     "eval [expression] [yaml_file1]...",
 		Aliases: []string{"e"},
-		Short:   "Apply the expression to each document in each yaml file in sequence",
+		Short:   "(default) Apply the expression to each document in each yaml file in sequence",
 		Example: `
 # Reads field under the given path for each file
 yq e '.a.b' f1.yml f2.yml 
@@ -44,16 +44,16 @@ expression and prints the result in sequence.`,
 }

 func processExpression(expression string) string {
-	var prettyPrintExp = `(... | (select(tag != "!!str"), select(tag == "!!str") | select(test("(?i)^(y|yes|n|no|on|off)$") | not))  ) style=""`
+
 	if prettyPrint && expression == "" {
-		return prettyPrintExp
+		return yqlib.PrettyPrintExp
 	} else if prettyPrint {
-		return fmt.Sprintf("%v | %v", expression, prettyPrintExp)
+		return fmt.Sprintf("%v | %v", expression, yqlib.PrettyPrintExp)
 	}
 	return expression
 }

-func evaluateSequence(cmd *cobra.Command, args []string) error {
+func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -67,6 +67,27 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {

 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
+
+	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
+	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
+	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
+	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
+	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
+	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
+	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
+	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
+	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
+	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
+	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
+	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
+	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
+	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
+
+	// Mask for the type bits. For regular files, none will be set.
+	yqlib.GetLogger().Debug("ModeType: %v", stat.Mode()&os.ModeType)
+
+	yqlib.GetLogger().Debug("ModePerm: %v", stat.Mode()&os.ModePerm)

 	out := cmd.OutOrStdout()

@@ -80,7 +101,11 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		}
 		// need to indirectly call the function so  that completedSuccessfully is
 		// passed when we finish execution as opposed to now
-		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+		defer func() {
+			if cmdError == nil {
+				cmdError = writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully)
+			}
+		}()
 	}

 	format, err := yqlib.OutputFormatFromString(outputFormat)
@@ -88,13 +113,22 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		return err
 	}

-	printerWriter := configurePrinterWriter(format, out)
+	printerWriter, err := configurePrinterWriter(format, out)
+	if err != nil {
+		return err
+	}
+	encoder := configureEncoder(format)

-	printer := yqlib.NewPrinter(printerWriter, format, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+	printer := yqlib.NewPrinter(encoder, printerWriter)

+	decoder, err := configureDecoder()
+	if err != nil {
+		return err
+	}
 	streamEvaluator := yqlib.NewStreamEvaluator()

 	if frontMatter != "" {
+		yqlib.GetLogger().Debug("using front matter handler")
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
 		err = frontMatterHandler.Split()
 		if err != nil {
@@ -109,23 +143,18 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		}
 		defer frontMatterHandler.CleanUp()
 	}
+	expression, args := processArgs(pipingStdIn, args)

 	switch len(args) {
 	case 0:
-		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer, leadingContentPreProcessing)
+		if nullInput {
+			err = streamEvaluator.EvaluateNew(processExpression(expression), printer, "")
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
-	case 1:
-		if nullInput {
-			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer, "")
-		} else {
-			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer, leadingContentPreProcessing)
-		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer, leadingContentPreProcessing)
+		err = streamEvaluator.EvaluateFiles(processExpression(expression), args, printer, leadingContentPreProcessing, decoder)
 	}
 	completedSuccessfully = err == nil

@@ -3,6 +3,7 @@ package cmd
 import (
 	"os"

+	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
 	logging "gopkg.in/op/go-logging.v1"
 )
@@ -13,17 +14,27 @@ func New() *cobra.Command {
 		Short: "yq is a lightweight and portable command-line YAML processor.",
 		Long: `yq is a portable command-line YAML processor (https://github.com/mikefarah/yq/) 
 See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
+		Example: `
+# yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
+
+# read the "stuff" node from "myfile.yml"
+cat myfile.yml | yq '.stuff' 
+
+# update myfile.yml in place
+yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+`,
+
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if version {
 				cmd.Print(GetVersionDisplay())
 				return nil
 			}
-			cmd.Println(cmd.UsageString())
-			return nil
+			return evaluateSequence(cmd, args)

 		},
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			cmd.SetOut(cmd.OutOrStdout())
+
 			var format = logging.MustStringFormatter(
 				`%{color}%{time:15:04:05} %{shortfunc} [%{level:.4s}]%{color:reset} %{message}`,
 			)
@@ -37,6 +48,9 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 			}

 			logging.SetBackend(backend)
+			yqlib.InitExpressionParser()
+			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
+			yqlib.XMLPreferences.ContentName = xmlContentName
 		},
 	}

@@ -48,13 +62,18 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 		panic(err)
 	}

-	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output-format", "o", "yaml", "[yaml|y|json|j|props|p] output format type.")
-	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.")
+	rootCmd.PersistentFlags().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().StringVar(&xmlAttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
+	rootCmd.PersistentFlags().StringVar(&xmlContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+
+	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")

 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
-	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace of first yaml file given.")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file inplace of first file given.")
 	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
 	rootCmd.PersistentFlags().BoolVarP(&prettyPrint, "prettyPrint", "P", false, "pretty print, shorthand for '... style = \"\"'")
 	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")
@@ -62,7 +81,8 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
 	rootCmd.PersistentFlags().StringVarP(&frontMatter, "front-matter", "f", "", "(extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact")
-	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression. This is a workaround for go-yaml to persist header content properly.")
+	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().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.")

@@ -7,6 +7,7 @@ import (

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
+	"gopkg.in/op/go-logging.v1"
 )

 func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
@@ -45,19 +46,101 @@ func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err err
 	return firstFileIndex, nil
 }

-func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) yqlib.PrinterWriter {
+func configureDecoder() (yqlib.Decoder, error) {
+	yqlibInputFormat, err := yqlib.InputFormatFromString(inputFormat)
+	if err != nil {
+		return nil, err
+	}
+	switch yqlibInputFormat {
+	case yqlib.XMLInputFormat:
+		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName), nil
+	case yqlib.PropertiesInputFormat:
+		return yqlib.NewPropertiesDecoder(), nil
+	}
+
+	return yqlib.NewYamlDecoder(), nil
+}
+
+func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yqlib.PrinterWriter, error) {

 	var printerWriter yqlib.PrinterWriter

 	if splitFileExp != "" {
 		colorsEnabled = forceColor
-		splitExp, err := yqlib.NewExpressionParser().ParseExpression(splitFileExp)
+		splitExp, err := yqlib.ExpressionParser.ParseExpression(splitFileExp)
 		if err != nil {
-			return nil
+			return nil, fmt.Errorf("bad split document expression: %w", err)
 		}
 		printerWriter = yqlib.NewMultiPrinterWriter(splitExp, format)
 	} else {
 		printerWriter = yqlib.NewSinglePrinterWriter(out)
 	}
-	return printerWriter
+	return printerWriter, nil
+}
+
+func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
+	switch format {
+	case yqlib.JSONOutputFormat:
+		return yqlib.NewJONEncoder(indent)
+	case yqlib.PropsOutputFormat:
+		return yqlib.NewPropertiesEncoder()
+	case yqlib.CSVOutputFormat:
+		return yqlib.NewCsvEncoder(',')
+	case yqlib.TSVOutputFormat:
+		return yqlib.NewCsvEncoder('\t')
+	case yqlib.YamlOutputFormat:
+		return yqlib.NewYamlEncoder(indent, colorsEnabled, !noDocSeparators, unwrapScalar)
+	case yqlib.XMLOutputFormat:
+		return yqlib.NewXMLEncoder(indent, xmlAttributePrefix, xmlContentName)
+	}
+	panic("invalid encoder")
+}
+
+// this is a hack to enable backwards compatibility with githubactions (which pipe /dev/null into everything)
+// and being able to call yq with the filename as a single parameter
+//
+// without this - yq detects there is stdin (thanks githubactions),
+// then tries to parse the filename as an expression
+func maybeFile(str string) bool {
+	yqlib.GetLogger().Debugf("checking '%v' is a file", str)
+	stat, err := os.Stat(str) // #nosec
+	result := err == nil && !stat.IsDir()
+	if yqlib.GetLogger().IsEnabledFor(logging.DEBUG) {
+		if err != nil {
+			yqlib.GetLogger().Debugf("error: %v", err)
+		} else {
+			yqlib.GetLogger().Debugf("error: %v, dir: %v", err, stat.IsDir())
+		}
+		yqlib.GetLogger().Debugf("result: %v", result)
+	}
+	return result
+}
+
+func processStdInArgs(pipingStdin bool, args []string) []string {
+	if !pipingStdin {
+		return args
+	}
+
+	for _, arg := range args {
+		if arg == "-" {
+			return args
+		}
+	}
+	yqlib.GetLogger().Debugf("missing '-', adding it to the end")
+
+	// we're piping from stdin, but there's no '-' arg
+	// lets add one to the end
+	return append(args, "-")
+}
+
+func processArgs(pipingStdin bool, originalArgs []string) (string, []string) {
+	args := processStdInArgs(pipingStdin, originalArgs)
+	yqlib.GetLogger().Debugf("processed args: %v", args)
+	expression := forceExpression
+	if expression == "" && len(args) > 0 && args[0] != "-" && !maybeFile(args[0]) {
+		yqlib.GetLogger().Debug("assuming expression is '%v'", args[0])
+		expression = args[0]
+		args = args[1:]
+	}
+	return expression, args
 }
@@ -11,7 +11,7 @@ var (
 	GitDescribe string

 	// Version is main version number that is being run at the moment.
-	Version = "4.16.2"
+	Version = "4.19.1"

 	// 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
@@ -1,3 +1,112 @@
+yq (4.16.2) focal; urgency=medium
+
+  * Fixed with semicolon space issue
+  * Updating with documentation
+  * Added STDIN example to the top
+  * minor readme cleanup
+  * Help text tweak
+  * Fixed docker timeout - simplify docker builds
+  * New release with docker build fixes
+  * Updating to go 1.17 to fix CVE #944
+  * Fix a typo in root.go
+  * Skip the tests if the nocheck Debian build option is specified
+  * Fixed select bug (#958)
+  * Sped up explode operator
+  * Slight performance improvement to context.ChildContext
+  * Speed up multiply
+  * Update README with recently added / changed options
+  * Make deepMatch report in linear time
+  * Removed leadingContentPreProcessing flag - header preprocessing is stable
+  * Revert "Removed leadingContentPreProcessing flag - header preprocessing is stable"
+  * Keep flag, it is needed in corner cases
+  * Updated Readme
+  * Man page
+  * Fixed expression parsing bug #970
+  * Bumping go-lang, docker versions
+  * Added test release flow
+  * Updated github action release to generate man page
+  * Bumping version
+  * Removing no longer needed github action
+  * Added decoder op
+  * Fixed newline handling when decoding/encoding
+  * Fixed newline handling in encoder/decoder
+  * Can specify indent in encode ops
+  * Added group_by operator
+  * Added flatten operator
+  * Fixed flatten error message
+  * Improving docs
+  * Split printer
+  * Refactored command logic
+  * Fix JSON encoding removing null #985
+  * Fixed acceptance tests
+  * gitbook
+  * Update document generation script
+  * Updating README
+  * Updating release instructions
+  * github action no longer uses data1.yml
+  * Create dependabot.yml
+  * Bump actions/create-release from 1.0.0 to 1.1.4
+  * Bump actions/setup-go from 1 to 2.1.4
+  * Bump github.com/goccy/go-yaml from 1.8.9 to 1.9.4
+  * Bump github.com/jinzhu/copier from 0.2.8 to 0.3.2
+  * Bump github.com/fatih/color from 1.10.0 to 1.13.0
+  * Bump github.com/spf13/cobra from 1.1.3 to 1.2.1
+  * Update dependabot.yml
+  * Update go.yml
+  * add build check to PRs
+  * Include secure as part of build process
+  * Fixing bad label in github action
+  * fixed printer test
+  * remove leading content indicator
+  * Fixed header preprocessing!
+  * lint : define golangci configuration file
+  * Update check.sh
+  * Load file acceptance test
+  * Minor improvement on handling front matter
+  * Improved load doc
+  * feature: detect MANPATh and install there
+  * Update install-man-page.sh
+  * simplify prod stage, move version label to action
+  * add labels, quote some values
+  * enable errorlint linter
+  * Added errorlint to devtools
+  * Added key operator
+  * Added more tests
+  * Fixing comments
+  * Attempt to fix golint problem
+  * Include version query for tools
+  * Clean up errored file?
+  * enable misspell linter
+  * updated readme
+  * update Golangci version to v1.43.0
+  * gci linter
+  * Better merge array by key example
+  * Added credit for merge by array example
+  * Better formatting of merge arrays example
+  * Better merge example
+  * Add accessor for the yq logger instance (#1013)
+  * Fixed collect op when working with multiple nodes
+  * Added map, map_values
+  * Add support for Podman as well as Docker (#1026)
+  * Bump github.com/jinzhu/copier from 0.3.2 to 0.3.4 (#1027)
+  * Added csv, tsv output formats
+  * Added encoder tests
+  * Cleanup test
+  * Fixed docker permission issue #1014
+  * Recording release notes for next release
+  * Assignment op no longer clobbers anchor (#1029)
+  * Added sort_by operator
+  * Improved error message
+  * Improved tips and tricks
+  * Report while filename failed to parse #1030
+  * Added script for extracting checksums
+  * Improved extract-checksum.sh
+  * Bump github.com/spf13/cobra from 1.2.1 to 1.3.0 (#1039)
+  * enable more linters (#1043)
+  * Bump golang compiler #1037
+
+ -- Roberto Mier Escandon <rmescandon@gmail.com>  Tue, 21 Dec 2021 09:41:44 +0000
+
 yq (4.13.0) focal; urgency=medium

  * New `with` operator for making multiple changes to a given path
@@ -3,7 +3,8 @@ Section: devel
 Priority: optional
 Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
 Build-Depends: debhelper (>=10),
-               golang-1.15,
+               golang-1.17-go,
+               pandoc,
               rsync
 Standards-Version: 4.1.4
 Homepage: https://github.com/mikefarah/yq.git
@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 #
-# Copyright (C) 2018 Roberto Mier Escandón <rmescandon@gmail.com>
+# Copyright (C) 2018-2021 Roberto Mier Escandón <rmescandon@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
@@ -17,20 +17,21 @@
 PROJECT := yq
 OWNER := mikefarah
 REPO := github.com
-GOVERSION := 1.15

 export DH_OPTIONS
 export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
-export GOROOT := /usr/lib/go-${GOVERSION}
+export GOROOT := /usr/local/go
 export GOPATH := ${CURDIR}/_build
 export GOBIN := ${GOPATH}/bin
 export PATH := ${GOROOT}/bin:${GOBIN}:${PATH}
 export GOCACHE := /tmp/gocache
 export GOFLAGS := -mod=vendor
+export GO111MODULE := on

 SRCDIR := ${GOPATH}/src/${DH_GOPKG}
 DESTDIR := ${CURDIR}/debian/${PROJECT}
 BINDIR := /usr/bin
+MANDIR := /usr/share/man/man1/
 ASSETSDIR := /usr/share/${PROJECT}

 %:
@@ -42,7 +43,17 @@ override_dh_auto_build:
 	# copy project to local srcdir to build from there
 	rsync -avz --progress --exclude=_build --exclude=debian --exclude=tmp. --exclude=go.mod --exclude=docs . $(SRCDIR)
 	# build go code
-	(cd ${SRCDIR} && go install -buildmode=pie ./...)
+	( \
+		cd ${SRCDIR} && \
+		go install -buildmode=pie ./... \
+	)
+
+	# build man page
+	( \
+		cd ${SRCDIR} && \
+		./scripts/generate-man-page-md.sh && \
+		./scripts/generate-man-page.sh \
+	)
 	
 override_dh_auto_test:
 ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
@@ -54,6 +65,10 @@ override_dh_auto_install:
 	cp -f ${SRCDIR}/LICENSE ${DESTDIR}/${ASSETSDIR}
 	chmod a+x ${DESTDIR}/${BINDIR}/yq

+	# man
+	mkdir -p "${DESTDIR}"/"${MANDIR}"
+	cp "${SRCDIR}"/yq.1 "${DESTDIR}"/"${MANDIR}" \
+
 override_dh_auto_clean:
 	dh_clean
 	rm -rf ${CURDIR}/_build
@@ -1,15 +1 @@
-strings:
-  - a: banana
-  - a: cat
-  - a: apple
-
-numbers:
-  - a: 12
-  - a: 13
-  - a: 120
-
-
-obj:
-  - a: {cat: "adog"}
-  - a: {cat: "doga"}
-  - a: apple
+cat: purrs
@@ -0,0 +1,6 @@
+# comments on values appear
+person.name = Mike
+
+# comments on array values appear
+person.pets.0 = cat
+person.food.0 = pizza
@@ -0,0 +1,14 @@
+<!-- before cat -->
+<cat>
+	<!-- in cat before -->
+	<x>3<!-- multi
+line comment
+for x --></x>
+	<y>
+		<!-- in y before -->
+		<d><!-- in d before -->4<!-- in d after --></d>
+		<!-- in y after -->
+	</y>
+	<!-- in_cat_after -->
+</cat>
+<!-- after cat -->
@@ -0,0 +1,11 @@
+  <?xml version="1.0" encoding="UTF-8"?>
+  <!-- osm-->
+  <osm version="0.6" generator="CGImap 0.0.2">
+  <!-- bounds-->
+   <bounds minlat="54.0889580" minlon="12.2487570" maxlat="54.0913900" maxlon="12.2524800">
+   <!-- great -->
+   cool
+   </bounds>
+   <foo>ba2234r</foo>
+   <foo>bar2234233</foo>
+  </osm>
@@ -1,13 +1,16 @@
 module github.com/mikefarah/yq/v4

 require (
+	github.com/a8m/envsubst v1.3.0
 	github.com/elliotchance/orderedmap v1.4.0
 	github.com/fatih/color v1.13.0
-	github.com/goccy/go-yaml v1.9.4
-	github.com/jinzhu/copier v0.3.4
+	github.com/goccy/go-yaml v1.9.5
+	github.com/jinzhu/copier v0.3.5
 	github.com/magiconair/properties v1.8.5
+	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
 	github.com/spf13/cobra v1.3.0
 	github.com/timtadh/lexmachine v0.2.2
+	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
@@ -19,6 +22,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/timtadh/data-structures v0.5.3 // indirect
 	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
+	golang.org/x/text v0.3.7 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )

@@ -50,6 +50,8 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/a8m/envsubst v1.3.0 h1:GmXKmVssap0YtlU3E230W98RWtWCyIZzjtf1apWWyAg=
+github.com/a8m/envsubst v1.3.0/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -123,8 +125,8 @@ github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTM
 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/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/goccy/go-yaml v1.9.4 h1:S0GCYjwHKVI6IHqio7QWNKNThUl6NLzFd/g8Z65Axw8=
-github.com/goccy/go-yaml v1.9.4/go.mod h1:U/jl18uSupI5rdI2jmuCswEA2htH9eXfferR3KfscvA=
+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/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
@@ -235,8 +237,8 @@ github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 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 v0.3.4 h1:mfU6jI9PtCeUjkjQ322dlff9ELjGDu975C2p/nrubVI=
-github.com/jinzhu/copier v0.3.4/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
+github.com/jinzhu/copier v0.3.5 h1:GlvfUwHk62RokgqVNvYsku0TATCF7bAHVwEXoBh3iJg=
+github.com/jinzhu/copier v0.3.5/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@@ -292,6 +294,8 @@ github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRW
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pelletier/go-toml v1.9.4/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
+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/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
@@ -449,6 +453,7 @@ golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLd
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1/go.mod h1:9tjilg8BloeKEkVJvy7fQ90B1CfIiPueXVOjqfkSzI8=
 golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d h1:LO7XpTYMwTqxjLcGWPijK3vRXg1aWdlNOVOHRq45d7c=
 golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -553,6 +558,7 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+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/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -1,8 +0,0 @@
-#!/bin/bash
-# ./yq ea '.[]'  examples/data*.yaml
-
-
-./yq ea '
-  ((.[] | {.name: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
-  | ( $uniqueMap  | to_entries | .[]) as $item ireduce([]; . + $item.value)
-' examples/data*.yaml
@@ -8,7 +8,7 @@ import (

 // A yaml expression evaluator that runs the expression once against all files/nodes in memory.
 type Evaluator interface {
-	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) error
+	EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error

 	// EvaluateNodes takes an expression and one or more yaml nodes, returning a list of matching candidate nodes
 	EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error)
@@ -19,11 +19,10 @@ type Evaluator interface {

 type allAtOnceEvaluator struct {
 	treeNavigator DataTreeNavigator
-	treeCreator   ExpressionParser
 }

 func NewAllAtOnceEvaluator() Evaluator {
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
 }

 func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error) {
@@ -35,7 +34,7 @@ func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Nod
 }

 func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
-	node, err := e.treeCreator.ParseExpression(expression)
+	node, err := ExpressionParser.ParseExpression(expression)
 	if err != nil {
 		return nil, err
 	}
@@ -46,7 +45,7 @@ func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCand
 	return context.MatchingNodes, nil
 }

-func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool) error {
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, leadingContentPreProcessing bool, decoder Decoder) error {
 	fileIndex := 0
 	firstFileLeadingContent := ""

@@ -61,7 +60,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 			firstFileLeadingContent = leadingContent
 		}

-		fileDocuments, err := readDocuments(reader, filename, fileIndex)
+		fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
 		if err != nil {
 			return err
 		}
@@ -31,6 +31,7 @@ var evaluateNodesScenario = []expressionScenario{
 }

 func TestAllAtOnceEvaluateNodes(t *testing.T) {
+	InitExpressionParser()
 	var evaluator = NewAllAtOnceEvaluator()
 	for _, tt := range evaluateNodesScenario {
 		node := test.ParseData(tt.document)
@@ -136,7 +136,12 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 		n.Node.Value = ""
 	}
 	n.Node.Kind = other.Node.Kind
-	n.Node.Tag = other.Node.Tag
+
+	// don't clobber custom tags...
+	if strings.HasPrefix(n.Node.Tag, "!!") || n.Node.Tag == "" {
+		n.Node.Tag = other.Node.Tag
+	}
+
 	n.Node.Alias = other.Node.Alias

 	if !prefs.DontOverWriteAnchor {
@@ -145,7 +150,10 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP

 	// merge will pickup the style of the new thing
 	// when autocreating nodes
-	if n.Node.Style == 0 {
+	//
+	// if this is an empty map or empty array, use the style of other node.
+
+	if n.Node.Style == 0 || (n.Node.Kind != yaml.ScalarNode && len(n.Node.Content) == 0) {
 		n.Node.Style = other.Node.Style
 	}

@@ -0,0 +1,34 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type InputFormat uint
+
+const (
+	YamlInputFormat = 1 << iota
+	XMLInputFormat
+	PropertiesInputFormat
+)
+
+type Decoder interface {
+	Init(reader io.Reader)
+	Decode(node *yaml.Node) error
+}
+
+func InputFormatFromString(format string) (InputFormat, error) {
+	switch format {
+	case "yaml", "y":
+		return YamlInputFormat, nil
+	case "xml", "x":
+		return XMLInputFormat, nil
+	case "props", "p":
+		return PropertiesInputFormat, nil
+	default:
+		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml|props]", format)
+	}
+}
@@ -0,0 +1,121 @@
+package yqlib
+
+import (
+	"bytes"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/magiconair/properties"
+	"gopkg.in/yaml.v3"
+)
+
+type propertiesDecoder struct {
+	reader   io.Reader
+	finished bool
+	d        DataTreeNavigator
+}
+
+func NewPropertiesDecoder() Decoder {
+	return &propertiesDecoder{d: NewDataTreeNavigator(), finished: false}
+}
+
+func (dec *propertiesDecoder) Init(reader io.Reader) {
+	dec.reader = reader
+	dec.finished = false
+}
+
+func parsePropKey(key string) []interface{} {
+	pathStrArray := strings.Split(key, ".")
+	path := make([]interface{}, len(pathStrArray))
+	for i, pathStr := range pathStrArray {
+		num, err := strconv.ParseInt(pathStr, 10, 32)
+		if err == nil {
+			path[i] = num
+		} else {
+			path[i] = pathStr
+		}
+	}
+	return path
+}
+
+func (dec *propertiesDecoder) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	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)
+
+	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 := dec.d.GetMatchingNodes(context, assignmentOpNode)
+	return err
+}
+
+func (dec *propertiesDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	buf := new(bytes.Buffer)
+
+	if _, err := buf.ReadFrom(dec.reader); err != nil {
+		return err
+	}
+	if buf.Len() == 0 {
+		dec.finished = true
+		return io.EOF
+	}
+	properties, err := properties.LoadString(buf.String())
+	if err != nil {
+		return err
+	}
+
+	rootMap := &CandidateNode{
+		Node: &yaml.Node{
+			Kind: yaml.MappingNode,
+			Tag:  "!!map",
+		},
+	}
+
+	context := Context{}
+	context = context.SingleChildContext(rootMap)
+
+	for _, key := range properties.Keys() {
+		if err := dec.applyProperty(properties, context, key); err != nil {
+			return err
+		}
+
+	}
+
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{rootMap.Node}
+	dec.finished = true
+	return nil
+
+}
@@ -0,0 +1,60 @@
+package yqlib
+
+import (
+	"bufio"
+	"bytes"
+	"strings"
+)
+
+type formatScenario struct {
+	input          string
+	indent         int
+	expression     string
+	expected       string
+	description    string
+	subdescription string
+	skipDoc        bool
+	scenarioType   string
+}
+
+func processFormatScenario(s formatScenario, decoder Decoder, encoder Encoder) string {
+
+	var output bytes.Buffer
+	writer := bufio.NewWriter(&output)
+
+	if decoder == nil {
+		decoder = NewYamlDecoder()
+	}
+
+	inputs, err := readDocuments(strings.NewReader(s.input), "sample.yml", 0, decoder)
+	if err != nil {
+		panic(err)
+	}
+
+	expression := s.expression
+	if expression == "" {
+		expression = "."
+	}
+
+	exp, err := getExpressionParser().ParseExpression(expression)
+
+	if err != nil {
+		panic(err)
+	}
+
+	context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: inputs}, exp)
+
+	if err != nil {
+		panic(err)
+	}
+
+	printer := NewPrinter(encoder, NewSinglePrinterWriter(writer))
+	err = printer.PrintResults(context.MatchingNodes)
+	if err != nil {
+		panic(err)
+	}
+	writer.Flush()
+
+	return output.String()
+
+}
@@ -0,0 +1,317 @@
+package yqlib
+
+import (
+	"encoding/xml"
+	"io"
+	"strings"
+	"unicode"
+
+	"golang.org/x/net/html/charset"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type xmlDecoder struct {
+	reader          io.Reader
+	attributePrefix string
+	contentName     string
+	finished        bool
+}
+
+func NewXMLDecoder(attributePrefix string, contentName string) Decoder {
+	if contentName == "" {
+		contentName = "content"
+	}
+	return &xmlDecoder{attributePrefix: attributePrefix, contentName: contentName, finished: false}
+}
+
+func (dec *xmlDecoder) Init(reader io.Reader) {
+	dec.reader = reader
+	dec.finished = false
+}
+
+func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
+	yamlNode := &yaml.Node{Kind: yaml.SequenceNode}
+	for _, child := range nodes {
+		yamlChild, err := dec.convertToYamlNode(child)
+		if err != nil {
+			return nil, err
+		}
+		yamlNode.Content = append(yamlNode.Content, yamlChild)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) processComment(c string) string {
+	if c == "" {
+		return ""
+	}
+	return "#" + strings.TrimRight(c, " ")
+}
+
+func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
+	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode}
+
+	if len(n.Data) > 0 {
+		label := dec.contentName
+		labelNode := createScalarNode(label, label)
+		labelNode.HeadComment = dec.processComment(n.HeadComment)
+		labelNode.FootComment = dec.processComment(n.FootComment)
+		yamlNode.Content = append(yamlNode.Content, labelNode, createScalarNode(n.Data, n.Data))
+	}
+
+	for i, keyValuePair := range n.Children {
+		label := keyValuePair.K
+		children := keyValuePair.V
+		labelNode := createScalarNode(label, label)
+		var valueNode *yaml.Node
+		var err error
+
+		if i == 0 {
+			labelNode.HeadComment = dec.processComment(n.HeadComment)
+
+		}
+
+		// if i == len(n.Children)-1 {
+		labelNode.FootComment = dec.processComment(keyValuePair.FootComment)
+		// }
+
+		log.Debug("len of children in %v is %v", label, len(children))
+		if len(children) > 1 {
+			valueNode, err = dec.createSequence(children)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			// comment hack for maps of scalars
+			// if the value is a scalar, the head comment of the scalar needs to go on the key?
+			// add tests for <z/> as well as multiple <ds> of inputXmlWithComments > yaml
+			if len(children[0].Children) == 0 && children[0].HeadComment != "" {
+				labelNode.HeadComment = labelNode.HeadComment + "\n" + strings.TrimSpace(children[0].HeadComment)
+				children[0].HeadComment = ""
+			}
+			valueNode, err = dec.convertToYamlNode(children[0])
+			if err != nil {
+				return nil, err
+			}
+		}
+		yamlNode.Content = append(yamlNode.Content, labelNode, valueNode)
+	}
+
+	return yamlNode, nil
+}
+
+func (dec *xmlDecoder) convertToYamlNode(n *xmlNode) (*yaml.Node, error) {
+	if len(n.Children) > 0 {
+		return dec.createMap(n)
+	}
+	scalar := createScalarNode(n.Data, n.Data)
+	if n.Data == "" {
+		scalar = createScalarNode(nil, "")
+	}
+	log.Debug("scalar headC: %v, footC: %v", n.HeadComment, n.FootComment)
+	scalar.HeadComment = dec.processComment(n.HeadComment)
+	scalar.LineComment = dec.processComment(n.LineComment)
+	scalar.FootComment = dec.processComment(n.FootComment)
+
+	return scalar, nil
+}
+
+func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	root := &xmlNode{}
+	// cant use xj - it doesn't keep map order.
+	err := dec.decodeXML(root)
+
+	if err != nil {
+		return err
+	}
+	firstNode, err := dec.convertToYamlNode(root)
+
+	if err != nil {
+		return err
+	} else if firstNode.Tag == "!!null" {
+		dec.finished = true
+		return io.EOF
+	}
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{firstNode}
+	dec.finished = true
+	return nil
+}
+
+type xmlNode struct {
+	Children    []*xmlChildrenKv
+	HeadComment string
+	FootComment string
+	LineComment string
+	Data        string
+}
+
+type xmlChildrenKv struct {
+	K           string
+	V           []*xmlNode
+	FootComment string
+}
+
+// AddChild appends a node to the list of children
+func (n *xmlNode) AddChild(s string, c *xmlNode) {
+
+	if n.Children == nil {
+		n.Children = make([]*xmlChildrenKv, 0)
+	}
+	log.Debug("looking for %s", s)
+	// see if we can find an existing entry to add to
+	for _, childEntry := range n.Children {
+		if childEntry.K == s {
+			log.Debug("found it, appending an entry%s", s)
+			childEntry.V = append(childEntry.V, c)
+			log.Debug("yay len of children in %v is %v", s, len(childEntry.V))
+			return
+		}
+	}
+	log.Debug("not there, making a new one %s", s)
+	n.Children = append(n.Children, &xmlChildrenKv{K: s, V: []*xmlNode{c}})
+}
+
+type element struct {
+	parent *element
+	n      *xmlNode
+	label  string
+	state  string
+}
+
+// this code is heavily based on https://github.com/basgys/goxml2json
+// main changes are to decode into a structure that preserves the original order
+// of the map keys.
+func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
+	xmlDec := xml.NewDecoder(dec.reader)
+
+	// That will convert the charset if the provided XML is non-UTF-8
+	xmlDec.CharsetReader = charset.NewReaderLabel
+
+	// Create first element from the root node
+	elem := &element{
+		parent: nil,
+		n:      root,
+	}
+
+	for {
+		t, _ := xmlDec.Token()
+		if t == nil {
+			break
+		}
+
+		switch se := t.(type) {
+		case xml.StartElement:
+			log.Debug("start element %v", se.Name.Local)
+			elem.state = "started"
+			// Build new a new current element and link it to its parent
+			elem = &element{
+				parent: elem,
+				n:      &xmlNode{},
+				label:  se.Name.Local,
+			}
+
+			// Extract attributes as children
+			for _, a := range se.Attr {
+				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
+			}
+		case xml.CharData:
+			// Extract XML data (if any)
+			elem.n.Data = trimNonGraphic(string(se))
+			if elem.n.Data != "" {
+				elem.state = "chardata"
+				log.Debug("chardata [%v] for %v", elem.n.Data, elem.label)
+			}
+		case xml.EndElement:
+			log.Debug("end element %v", elem.label)
+			elem.state = "finished"
+			// And add it to its parent list
+			if elem.parent != nil {
+				elem.parent.n.AddChild(elem.label, elem.n)
+			}
+
+			// Then change the current element to its parent
+			elem = elem.parent
+		case xml.Comment:
+
+			commentStr := string(xml.CharData(se))
+			if elem.state == "started" {
+				applyFootComment(elem, commentStr)
+
+			} else if elem.state == "chardata" {
+				log.Debug("got a line comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.LineComment = joinFilter([]string{elem.n.LineComment, commentStr})
+			} else {
+				log.Debug("got a head comment for (%v) %v: [%v]", elem.state, elem.label, commentStr)
+				elem.n.HeadComment = joinFilter([]string{elem.n.HeadComment, commentStr})
+			}
+
+		}
+	}
+
+	return nil
+}
+
+func applyFootComment(elem *element, commentStr string) {
+
+	// first lets try to put the comment on the last child
+	if len(elem.n.Children) > 0 {
+		lastChildIndex := len(elem.n.Children) - 1
+		childKv := elem.n.Children[lastChildIndex]
+		log.Debug("got a foot comment for %v: [%v]", childKv.K, commentStr)
+		childKv.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	} else {
+		log.Debug("got a foot comment for %v: [%v]", elem.label, commentStr)
+		elem.n.FootComment = joinFilter([]string{elem.n.FootComment, commentStr})
+	}
+}
+
+func joinFilter(rawStrings []string) string {
+	stringsToJoin := make([]string, 0)
+	for _, str := range rawStrings {
+		if str != "" {
+			stringsToJoin = append(stringsToJoin, str)
+		}
+	}
+	return strings.Join(stringsToJoin, " ")
+}
+
+// trimNonGraphic returns a slice of the string s, with all leading and trailing
+// non graphic characters and spaces removed.
+//
+// Graphic characters include letters, marks, numbers, punctuation, symbols,
+// and spaces, from categories L, M, N, P, S, Zs.
+// Spacing characters are set by category Z and property Pattern_White_Space.
+func trimNonGraphic(s string) string {
+	if s == "" {
+		return s
+	}
+
+	var first *int
+	var last int
+	for i, r := range []rune(s) {
+		if !unicode.IsGraphic(r) || unicode.IsSpace(r) {
+			continue
+		}
+
+		if first == nil {
+			f := i // copy i
+			first = &f
+			last = i
+		} else {
+			last = i
+		}
+	}
+
+	// If first is nil, it means there are no graphic characters
+	if first == nil {
+		return ""
+	}
+
+	return string([]rune(s)[*first : last+1])
+}
@@ -0,0 +1,23 @@
+package yqlib
+
+import (
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type yamlDecoder struct {
+	decoder yaml.Decoder
+}
+
+func NewYamlDecoder() Decoder {
+	return &yamlDecoder{}
+}
+
+func (dec *yamlDecoder) Init(reader io.Reader) {
+	dec.decoder = *yaml.NewDecoder(reader)
+}
+
+func (dec *yamlDecoder) Decode(rootYamlNode *yaml.Node) error {
+	return dec.decoder.Decode(rootYamlNode)
+}
@@ -1,79 +0,0 @@
-# Env Variable Operators
-
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-
-## Read string environment variable
-Running
-```bash
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: cat meow
-```
-
-## Read boolean environment variable
-Running
-```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: true
-```
-
-## Read numeric environment variable
-Running
-```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: 12
-```
-
-## Read yaml environment variable
-Running
-```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: {b: fish}
-```
-
-## Read boolean environment variable as a string
-Running
-```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "true"
-```
-
-## Read numeric environment variable as a string
-Running
-```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "12"
-```
-
-## Dynamic key lookup with environment variable
-Given a sample.yml file of:
-```yaml
-cat: meow
-dog: woof
-```
-then
-```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
-```
-will output
-```yaml
-meow
-```
-
@@ -1,8 +0,0 @@
-# Add
-
-Add behaves differently according to the type of the LHS:
-* arrays: concatenate
-* number scalars: arithmetic addition
-* string scalars: concatenate
-
-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
@@ -1,3 +0,0 @@
-# Env Variable Operators
-
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
@@ -0,0 +1,6 @@
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
@@ -4,31 +4,16 @@ Add behaves differently according to the type of the LHS:
 * arrays: concatenate
 * number scalars: arithmetic addition
 * string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)

-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.

-## Concatenate and assign arrays
-Given a sample.yml file of:
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-```
-then
-```bash
-yq eval '.a.b += ["cow"]' sample.yml
-```
-will output
-```yaml
-a:
-  val: thing
-  b:
-    - cat
-    - dog
-    - cow
-```
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}

 ## Concatenate arrays
 Given a sample.yml file of:
@@ -42,7 +27,7 @@ b:
 ```
 then
 ```bash
-yq eval '.a + .b' sample.yml
+yq '.a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -52,6 +37,28 @@ will output
 - 4
 ```

+## Concatenate to existing array
+Note that the styling of `a` is kept.
+
+Given a sample.yml file of:
+```yaml
+a: [1,2]
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: [1, 2, 3, 4]
+b:
+  - 3
+  - 4
+```
+
 ## Concatenate null to array
 Given a sample.yml file of:
 ```yaml
@@ -61,7 +68,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + null' sample.yml
+yq '.a + null' sample.yml
 ```
 will output
 ```yaml
@@ -69,6 +76,22 @@ will output
 - 2
 ```

+## Append to existing array
+Note that the styling is copied from existing array elements
+
+Given a sample.yml file of:
+```yaml
+a: ['dog']
+```
+then
+```bash
+yq '.a += "cat"' sample.yml
+```
+will output
+```yaml
+a: ['dog', 'cat']
+```
+
 ## Add new object to array
 Given a sample.yml file of:
 ```yaml
@@ -77,7 +100,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
+yq '.a + {"cat": "meow"}' sample.yml
 ```
 will output
 ```yaml
@@ -85,76 +108,6 @@ will output
 - cat: meow
 ```

-## Add string to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-```
-then
-```bash
-yq eval '.a + "hello"' sample.yml
-```
-will output
-```yaml
- 1
- 2
- hello
-```
-
-## Append to array
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
-## Append another array using +=
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-b:
-  - 3
-  - 4
-```
-then
-```bash
-yq eval '.a += .b' sample.yml
-```
-will output
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-  - 4
-b:
-  - 3
-  - 4
-```
-
 ## Relative append
 Given a sample.yml file of:
 ```yaml
@@ -169,7 +122,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
+yq '.a[].b += ["mouse"]' sample.yml
 ```
 will output
 ```yaml
@@ -193,7 +146,7 @@ b: meow
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a += .b' sample.yml
 ```
 will output
 ```yaml
@@ -211,7 +164,7 @@ b: 4.9
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +182,7 @@ b: 4
 ```
 then
 ```bash
-yq eval '.a = .a + .b' sample.yml
+yq '.a = .a + .b' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +198,7 @@ b: 5
 ```
 then
 ```bash
-yq eval '.[] += 1' sample.yml
+yq '.[] += 1' sample.yml
 ```
 will output
 ```yaml
@@ -258,10 +211,81 @@ Adding to null simply returns the rhs

 Running
 ```bash
-yq eval --null-input 'null + "cat"'
+yq --null-input 'null + "cat"'
 ```
 will output
 ```yaml
 cat
 ```

+## Add maps to shallow merge
+Adding objects together shallow merges them. Use `*` to deeply merge.
+
+Given a sample.yml file of:
+```yaml
+a:
+  thing:
+    name: Astuff
+    value: x
+  a1: cool
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a:
+  thing:
+    name: Bstuff
+    legs: 3
+  a1: cool
+  b1: neat
+b:
+  thing:
+    name: Bstuff
+    legs: 3
+  b1: neat
+```
+
+## Custom types: that are really strings
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse cat
+b: !goat _meow
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse cat_meow
+b: !goat _meow
+```
+
+## Custom types: that are really numbers
+When custom tags are encountered, yq will try to decode the underlying type.
+
+Given a sample.yml file of:
+```yaml
+a: !horse 1.2
+b: !goat 2.3
+```
+then
+```bash
+yq '.a += .b' sample.yml
+```
+will output
+```yaml
+a: !horse 3.5
+b: !goat 2.3
+```
+
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## LHS is defined
 Given a sample.yml file of:
 ```yaml
@@ -9,7 +15,7 @@ a: bridge
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -23,7 +29,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +43,7 @@ a: ~
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +57,7 @@ a: false
 ```
 then
 ```bash
-yq eval '.a // "hello"' sample.yml
+yq '.a // "hello"' sample.yml
 ```
 will output
 ```yaml
@@ -66,7 +72,7 @@ b: cat
 ```
 then
 ```bash
-yq eval '.a // .b' sample.yml
+yq '.a // .b' sample.yml
 ```
 will output
 ```yaml
@@ -5,6 +5,12 @@ 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

@@ -25,7 +31,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -55,7 +61,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +93,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[4] | explode(.)' sample.yml
+yq '.[4] | explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -103,7 +109,7 @@ a: &billyBob cat
 ```
 then
 ```bash
-yq eval '.a | anchor' sample.yml
+yq '.a | anchor' sample.yml
 ```
 will output
 ```yaml
@@ -117,7 +123,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a anchor = "foobar"' sample.yml
+yq '.a anchor = "foobar"' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +138,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a anchor |= .b' sample.yml
+yq '.a anchor |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +154,7 @@ a: *billyBob
 ```
 then
 ```bash
-yq eval '.a | alias' sample.yml
+yq '.a | alias' sample.yml
 ```
 will output
 ```yaml
@@ -163,7 +169,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = "meow"' sample.yml
+yq '.a alias = "meow"' sample.yml
 ```
 will output
 ```yaml
@@ -179,7 +185,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a alias = ""' sample.yml
+yq '.a alias = ""' sample.yml
 ```
 will output
 ```yaml
@@ -196,7 +202,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a alias |= .f' sample.yml
+yq '.a alias |= .f' sample.yml
 ```
 will output
 ```yaml
@@ -213,7 +219,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -229,7 +235,7 @@ a: mike
 ```
 then
 ```bash
-yq eval 'explode(.a)' sample.yml
+yq 'explode(.a)' sample.yml
 ```
 will output
 ```yaml
@@ -245,7 +251,7 @@ f:
 ```
 then
 ```bash
-yq eval 'explode(.f)' sample.yml
+yq 'explode(.f)' sample.yml
 ```
 will output
 ```yaml
@@ -278,7 +284,7 @@ foobar:
 ```
 then
 ```bash
-yq eval 'explode(.)' sample.yml
+yq 'explode(.)' sample.yml
 ```
 will output
 ```yaml
@@ -317,7 +323,7 @@ thingTwo:
 ```
 then
 ```bash
-yq eval '.thingOne |= explode(.) * {"value": false}' sample.yml
+yq '.thingOne |= explode(.) * {"value": false}' sample.yml
 ```
 will output
 ```yaml
@@ -7,10 +7,16 @@ Which will assign the LHS node values to the RHS node values. The RHS expression

 ### 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Create yaml file
 Running
 ```bash
-yq eval --null-input '.a.b = "cat" | .x = "frog"'
+yq --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -28,7 +34,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a |= .b' sample.yml
+yq '.a |= .b' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +51,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] |= . * 2' sample.yml
+yq '.[] |= . * 2' sample.yml
 ```
 will output
 ```yaml
@@ -84,7 +90,7 @@ b: sibling
 ```
 then
 ```bash
-yq eval '.a = .b' sample.yml
+yq '.a = .b' sample.yml
 ```
 will output
 ```yaml
@@ -101,7 +107,7 @@ c: fieldC
 ```
 then
 ```bash
-yq eval '(.a, .c) = "potatoe"' sample.yml
+yq '(.a, .c) = "potatoe"' sample.yml
 ```
 will output
 ```yaml
@@ -118,7 +124,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b = "frog"' sample.yml
+yq '.a.b = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -136,7 +142,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.b |= "frog"' sample.yml
+yq '.a.b |= "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -155,7 +161,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
+yq '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -173,7 +179,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
+yq '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -189,7 +195,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b |= "bogs"' sample.yml
+yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -205,7 +211,7 @@ a: &cool cat
 ```
 then
 ```bash
-yq eval '.a = "dog"' sample.yml
+yq '.a = "dog"' sample.yml
 ```
 will output
 ```yaml
@@ -219,7 +225,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b.[0] |= "bogs"' sample.yml
+yq '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -10,10 +10,16 @@ The `or` and `and` operators take two parameters and return a boolean result.

 These are most commonly used with the `select` operator to filter particular nodes.

+{% 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
-yq eval --null-input 'true or false'
+yq --null-input 'true or false'
 ```
 will output
 ```yaml
@@ -23,7 +29,7 @@ true
 ## `and` example
 Running
 ```bash
-yq eval --null-input 'true and false'
+yq --null-input 'true and false'
 ```
 will output
 ```yaml
@@ -42,7 +48,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +66,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +80,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'any' sample.yml
+yq 'any' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +99,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
+yq '.[] |= any_c(. == "awesome")' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +115,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -123,7 +129,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'all' sample.yml
+yq 'all' sample.yml
 ```
 will output
 ```yaml
@@ -142,7 +148,7 @@ b:
 ```
 then
 ```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
+yq '.[] |= all_c(tag == "!!str")' sample.yml
 ```
 will output
 ```yaml
@@ -153,7 +159,7 @@ b: false
 ## Not true is false
 Running
 ```bash
-yq eval --null-input 'true | not'
+yq --null-input 'true | not'
 ```
 will output
 ```yaml
@@ -163,7 +169,7 @@ false
 ## Not false is true
 Running
 ```bash
-yq eval --null-input 'false | not'
+yq --null-input 'false | not'
 ```
 will output
 ```yaml
@@ -173,7 +179,7 @@ true
 ## String values considered to be true
 Running
 ```bash
-yq eval --null-input '"cat" | not'
+yq --null-input '"cat" | not'
 ```
 will output
 ```yaml
@@ -183,7 +189,7 @@ false
 ## Empty string value considered to be true
 Running
 ```bash
-yq eval --null-input '"" | not'
+yq --null-input '"" | not'
 ```
 will output
 ```yaml
@@ -193,7 +199,7 @@ false
 ## Numbers are considered to be true
 Running
 ```bash
-yq eval --null-input '1 | not'
+yq --null-input '1 | not'
 ```
 will output
 ```yaml
@@ -203,7 +209,7 @@ false
 ## Zero is considered to be true
 Running
 ```bash
-yq eval --null-input '0 | not'
+yq --null-input '0 | not'
 ```
 will output
 ```yaml
@@ -213,7 +219,7 @@ false
 ## Null is considered to be false
 Running
 ```bash
-yq eval --null-input '~ | not'
+yq --null-input '~ | not'
 ```
 will output
 ```yaml
@@ -3,10 +3,16 @@
 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Collect empty
 Running
 ```bash
-yq eval --null-input '[]'
+yq --null-input '[]'
 ```
 will output
 ```yaml
@@ -16,7 +22,7 @@ will output
 ## Collect single
 Running
 ```bash
-yq eval --null-input '["cat"]'
+yq --null-input '["cat"]'
 ```
 will output
 ```yaml
@@ -31,7 +37,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '[.a, .b]' sample.yml
+yq '[.a, .b]' sample.yml
 ```
 will output
 ```yaml
@@ -10,6 +10,12 @@ This will assign the LHS nodes comments to the expression on the RHS. The RHS is
 ### 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Set line comment
 Given a sample.yml file of:
 ```yaml
@@ -17,7 +23,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '.a lineComment="single"' sample.yml
+yq '.a lineComment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +38,7 @@ b: dog
 ```
 then
 ```bash
-yq eval '.. lineComment |= .' sample.yml
+yq '.. lineComment |= .' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +53,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. headComment="single"' sample.yml
+yq '. headComment="single"' sample.yml
 ```
 will output
 ```yaml
@@ -63,7 +69,7 @@ a: cat
 ```
 then
 ```bash
-yq eval '. footComment=.a' sample.yml
+yq '. footComment=.a' sample.yml
 ```
 will output
 ```yaml
@@ -80,7 +86,7 @@ b: dog # leave this
 ```
 then
 ```bash
-yq eval '.a lineComment=""' sample.yml
+yq '.a lineComment=""' sample.yml
 ```
 will output
 ```yaml
@@ -99,7 +105,7 @@ b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq '... comments=""' sample.yml
 ```
 will output
 ```yaml
@@ -114,7 +120,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '.a | lineComment' sample.yml
+yq '.a | lineComment' sample.yml
 ```
 will output
 ```yaml
@@ -132,7 +138,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '. | headComment' sample.yml
+yq '. | headComment' sample.yml
 ```
 will output
 ```yaml
@@ -151,7 +157,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval 'headComment' sample.yml
+yq 'headComment' sample.yml
 ```
 will output
 ```yaml
@@ -171,7 +177,7 @@ a: cat # meow
 ```
 then
 ```bash
-yq eval '. | footComment' sample.yml
+yq '. | footComment' sample.yml
 ```
 will output
 ```yaml
@@ -2,6 +2,12 @@

 This returns `true` if the context contains the passed in parameter, and false otherwise.

+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Array contains array
 Array is equal or subset of

@@ -13,7 +19,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains(["baz", "bar"])' sample.yml
+yq 'contains(["baz", "bar"])' sample.yml
 ```
 will output
 ```yaml
@@ -32,7 +38,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains({"bar": [{"barp": 12}]})' sample.yml
+yq 'contains({"bar": [{"barp": 12}]})' sample.yml
 ```
 will output
 ```yaml
@@ -51,7 +57,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
+yq 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml
 ```
 will output
 ```yaml
@@ -65,7 +71,7 @@ foobar
 ```
 then
 ```bash
-yq eval 'contains("bar")' sample.yml
+yq 'contains("bar")' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +85,7 @@ meow
 ```
 then
 ```bash
-yq eval 'contains("meow")' sample.yml
+yq 'contains("meow")' sample.yml
 ```
 will output
 ```yaml
@@ -2,10 +2,16 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Collect empty object
 Running
 ```bash
-yq eval --null-input '{}'
+yq --null-input '{}'
 ```
 will output
 ```yaml
@@ -19,7 +25,7 @@ name: Mike
 ```
 then
 ```bash
-yq eval '{"wrap": .}' sample.yml
+yq '{"wrap": .}' sample.yml
 ```
 will output
 ```yaml
@@ -37,7 +43,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -60,7 +66,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets.[]}' sample.yml
+yq '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -73,7 +79,7 @@ Rosey: sheep
 ## Creating yaml from scratch
 Running
 ```bash
-yq eval --null-input '{"wrap": "frog"}'
+yq --null-input '{"wrap": "frog"}'
 ```
 will output
 ```yaml
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Delete entry in map
 Given a sample.yml file of:
 ```yaml
@@ -10,7 +16,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.b)' sample.yml
+yq 'del(.b)' sample.yml
 ```
 will output
 ```yaml
@@ -26,7 +32,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.a.a1)' sample.yml
+yq 'del(.a.a1)' sample.yml
 ```
 will output
 ```yaml
@@ -43,7 +49,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[1])' sample.yml
+yq 'del(.[1])' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +65,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'del(.[0].a)' sample.yml
+yq 'del(.[0].a)' sample.yml
 ```
 will output
 ```yaml
@@ -74,7 +80,7 @@ b: dog
 ```
 then
 ```bash
-yq eval 'del(.c)' sample.yml
+yq 'del(.c)' sample.yml
 ```
 will output
 ```yaml
@@ -91,7 +97,7 @@ c: bat
 ```
 then
 ```bash
-yq eval 'del( .[] | select(. == "*at") )' sample.yml
+yq 'del( .[] | select(. == "*at") )' sample.yml
 ```
 will output
 ```yaml
@@ -109,7 +115,7 @@ a:
 ```
 then
 ```bash
-yq eval 'del(.. | select(has("name")).name)' sample.yml
+yq 'del(.. | select(has("name")).name)' sample.yml
 ```
 will output
 ```yaml
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Retrieve a document index
 Given a sample.yml file of:
 ```yaml
@@ -11,7 +17,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | documentIndex' sample.yml
+yq '.a | documentIndex' sample.yml
 ```
 will output
 ```yaml
@@ -29,7 +35,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | di' sample.yml
+yq '.a | di' sample.yml
 ```
 will output
 ```yaml
@@ -47,7 +53,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(documentIndex == 1)' sample.yml
+yq 'select(documentIndex == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -63,7 +69,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(di == 1)' sample.yml
+yq 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -79,7 +85,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
+yq '.a | ({"match": ., "doc": documentIndex})' sample.yml
 ```
 will output
 ```yaml
@@ -14,10 +14,19 @@ These operators are useful to process yaml documents that have stringified embed
 | Properties |  | to_props/@props |
 | CSV |  | to_csv/@csv |
 | TSV |  | to_tsv/@tsv |
+| XML | from_xml | to_xml(i)/@xml |


 CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 

+XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
+
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}

 ## Encode value as json string
 Given a sample.yml file of:
@@ -27,7 +36,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_json)' sample.yml
+yq '.b = (.a | to_json)' sample.yml
 ```
 will output
 ```yaml
@@ -49,7 +58,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_json(0))' sample.yml
+yq '.b = (.a | to_json(0))' sample.yml
 ```
 will output
 ```yaml
@@ -68,7 +77,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | @json)' sample.yml
+yq '.b = (.a | @json)' sample.yml
 ```
 will output
 ```yaml
@@ -86,7 +95,7 @@ a: '{"cool":"thing"}'
 ```
 then
 ```bash
-yq eval '.a | from_json | ... style=""' sample.yml
+yq '.a | from_json | ... style=""' sample.yml
 ```
 will output
 ```yaml
@@ -101,7 +110,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | @props)' sample.yml
+yq '.b = (.a | @props)' sample.yml
 ```
 will output
 ```yaml
@@ -122,7 +131,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_yaml)' sample.yml
+yq '.b = (.a | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -145,7 +154,7 @@ a:
 ```
 then
 ```bash
-yq eval '.b = (.a | to_yaml(8))' sample.yml
+yq '.b = (.a | to_yaml(8))' sample.yml
 ```
 will output
 ```yaml
@@ -164,7 +173,7 @@ a: 'foo: bar'
 ```
 then
 ```bash
-yq eval '.b = (.a | from_yaml)' sample.yml
+yq '.b = (.a | from_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -183,7 +192,7 @@ a: |
 ```
 then
 ```bash
-yq eval '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -199,7 +208,7 @@ a: 'foo: bar'
 ```
 then
 ```bash
-yq eval '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
+yq '.a |= (from_yaml | .foo = "cat" | to_yaml)' sample.yml
 ```
 will output
 ```yaml
@@ -218,7 +227,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@csv' sample.yml
+yq '@csv' sample.yml
 ```
 will output
 ```yaml
@@ -239,7 +248,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@csv' sample.yml
+yq '@csv' sample.yml
 ```
 will output
 ```yaml
@@ -263,7 +272,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '@tsv' sample.yml
+yq '@tsv' sample.yml
 ```
 will output
 ```yaml
@@ -271,3 +280,77 @@ cat	thing1,thing2	true	3.40
 dog	thing3	false	12
 ```

+## Encode value as xml string
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | to_xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi">
+  <foo>bar</foo>
+</cool>
+
+```
+
+## Encode value as xml string on a single line
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '.a | @xml' sample.yml
+```
+will output
+```yaml
+<cool id="hi"><foo>bar</foo></cool>
+
+```
+
+## Encode value as xml string with custom indentation
+Given a sample.yml file of:
+```yaml
+a:
+  cool:
+    foo: bar
+    +id: hi
+```
+then
+```bash
+yq '{"cat": .a | to_xml(1)}' sample.yml
+```
+will output
+```yaml
+cat: |
+  <cool id="hi">
+   <foo>bar</foo>
+  </cool>
+```
+
+## Decode a xml encoded string
+Given a sample.yml file of:
+```yaml
+a: <foo>bar</foo>
+```
+then
+```bash
+yq '.b = (.a | from_xml)' sample.yml
+```
+will output
+```yaml
+a: <foo>bar</foo>
+b:
+  foo: bar
+```
+
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## to_entries Map
 Given a sample.yml file of:
 ```yaml
@@ -10,7 +16,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -28,7 +34,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -45,7 +51,7 @@ null
 ```
 then
 ```bash
-yq eval 'to_entries' sample.yml
+yq 'to_entries' sample.yml
 ```
 will output
 ```yaml
@@ -59,7 +65,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -77,7 +83,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'to_entries | from_entries' sample.yml
+yq 'to_entries | from_entries' sample.yml
 ```
 will output
 ```yaml
@@ -93,7 +99,7 @@ b: 2
 ```
 then
 ```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
+yq 'with_entries(.key |= "KEY_" + .)' sample.yml
 ```
 will output
 ```yaml
@@ -111,7 +117,7 @@ c:
 ```
 then
 ```bash
-yq eval 'with_entries(select(.value | has("b")))' sample.yml
+yq 'with_entries(select(.value | has("b")))' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,166 @@
+# Env Variable Operators
+
+These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
+
+There are three operators:
+-  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
+- `strenv` which also takes a single environment variable name, and always parses the variable as a string.
+- `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
+
+
+## Tip
+To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
+as follows:
+
+```bash
+yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
+```
+
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Read string environment variable
+Running
+```bash
+myenv="cat meow" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: cat meow
+```
+
+## Read boolean environment variable
+Running
+```bash
+myenv="true" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: true
+```
+
+## Read numeric environment variable
+Running
+```bash
+myenv="12" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: 12
+```
+
+## Read yaml environment variable
+Running
+```bash
+myenv="{b: fish}" yq --null-input '.a = env(myenv)'
+```
+will output
+```yaml
+a: {b: fish}
+```
+
+## Read boolean environment variable as a string
+Running
+```bash
+myenv="true" yq --null-input '.a = strenv(myenv)'
+```
+will output
+```yaml
+a: "true"
+```
+
+## Read numeric environment variable as a string
+Running
+```bash
+myenv="12" yq --null-input '.a = strenv(myenv)'
+```
+will output
+```yaml
+a: "12"
+```
+
+## Dynamically update a path from an environment variable
+The env variable can be any valid yq expression.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+pathEnv=".a.b[0].name"  valueEnv="moo" yq 'eval(strenv(pathEnv)) = strenv(valueEnv)' sample.yml
+```
+will output
+```yaml
+a:
+  b:
+    - name: moo
+    - name: cat
+```
+
+## Dynamic key lookup with environment variable
+Given a sample.yml file of:
+```yaml
+cat: meow
+dog: woof
+```
+then
+```bash
+myenv="cat" yq '.[env(myenv)]' sample.yml
+```
+will output
+```yaml
+meow
+```
+
+## Replace strings with envsubst
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenv} meows" | envsubst'
+```
+will output
+```yaml
+the cat meows
+```
+
+## Replace strings with envsubst, missing variables
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
+```
+will output
+```yaml
+the  meows
+```
+
+## Replace strings with envsubst, missing variables with defaults
+Running
+```bash
+myenv="cat" yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
+```
+will output
+```yaml
+the dog meows
+```
+
+## Replace string environment variable in document
+Given a sample.yml file of:
+```yaml
+v: ${myenv}
+```
+then
+```bash
+myenv="cat meow" yq '.v |= envsubst' sample.yml
+```
+will output
+```yaml
+v: cat meow
+```
+
@@ -12,6 +12,12 @@ It is most often used with the select operator to find particular nodes:
 select(.a == .b)
 ```

+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Match string
 Given a sample.yml file of:
 ```yaml
@@ -21,7 +27,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == "*at")' sample.yml
+yq '.[] | (. == "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -39,7 +45,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != "*at")' sample.yml
+yq '.[] | (. != "*at")' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +63,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. == 4)' sample.yml
+yq '.[] | (. == 4)' sample.yml
 ```
 will output
 ```yaml
@@ -75,7 +81,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | (. != 4)' sample.yml
+yq '.[] | (. != 4)' sample.yml
 ```
 will output
 ```yaml
@@ -87,7 +93,7 @@ true
 ## Match nulls
 Running
 ```bash
-yq eval --null-input 'null == ~'
+yq --null-input 'null == ~'
 ```
 will output
 ```yaml
@@ -101,7 +107,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(.b != "thing")' sample.yml
+yq 'select(.b != "thing")' sample.yml
 ```
 will output
 ```yaml
@@ -115,7 +121,7 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(.b == .c)' sample.yml
+yq 'select(.b == .c)' sample.yml
 ```
 will output
 ```yaml
@@ -0,0 +1,54 @@
+# Eval
+
+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"`.
+
+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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Dynamically evaluate a path
+Given a sample.yml file of:
+```yaml
+pathExp: .a.b[] | select(.name == "cat")
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+yq 'eval(.pathExp)' sample.yml
+```
+will output
+```yaml
+name: cat
+```
+
+## Dynamically update a path from an environment variable
+The env variable can be any valid yq expression.
+
+Given a sample.yml file of:
+```yaml
+a:
+  b:
+    - name: dog
+    - name: cat
+```
+then
+```bash
+pathEnv=".a.b[0].name"  valueEnv="moo" yq 'eval(strenv(pathEnv)) = strenv(valueEnv)' sample.yml
+```
+will output
+```yaml
+a:
+  b:
+    - name: moo
+    - name: cat
+```
+
@@ -10,6 +10,12 @@ 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Get filename
 Given a sample.yml file of:
 ```yaml
@@ -17,7 +23,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'filename' sample.yml
+yq 'filename' sample.yml
 ```
 will output
 ```yaml
@@ -31,7 +37,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fileIndex' sample.yml
+yq 'fileIndex' sample.yml
 ```
 will output
 ```yaml
@@ -65,7 +71,7 @@ a: cat
 ```
 then
 ```bash
-yq eval 'fi' sample.yml
+yq 'fi' sample.yml
 ```
 will output
 ```yaml
@@ -1,6 +1,12 @@
 # Flatten
 This recursively flattens arrays.

+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Flatten
 Recursively flattens all arrays

@@ -12,7 +18,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -30,7 +36,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten(1)' sample.yml
+yq 'flatten(1)' sample.yml
 ```
 will output
 ```yaml
@@ -46,7 +52,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -61,7 +67,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'flatten' sample.yml
+yq 'flatten' sample.yml
 ```
 will output
 ```yaml
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Group by field
 Given a sample.yml file of:
 ```yaml
@@ -14,7 +20,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'group_by(.foo)' sample.yml
+yq 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml
@@ -40,7 +46,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval 'group_by(.foo)' sample.yml
+yq 'group_by(.foo)' sample.yml
 ```
 will output
 ```yaml
@@ -2,6 +2,12 @@

 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.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
 ## Has map key
 Given a sample.yml file of:
 ```yaml
@@ -12,7 +18,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has("a")' sample.yml
+yq '.[] | has("a")' sample.yml
 ```
 will output
 ```yaml
@@ -36,7 +42,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(.a.b | has("c"))' sample.yml
+yq '.[] | select(.a.b | has("c"))' sample.yml
 ```
 will output
 ```yaml
@@ -57,7 +63,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | has(1)' sample.yml
+yq '.[] | has(1)' sample.yml
 ```
 will output
 ```yaml
@@ -5,7 +5,7 @@

 yq [eval/eval-all] [expression] files..

-eval/e  - Apply the expression to each document in each yaml file in sequence
+eval/e  - (default) Apply the expression to each document in each yaml file in sequence

 eval-all/ea - Loads all yaml documents of all yaml files and runs expression once

@@ -18,32 +18,33 @@ This documentation is also available at https://mikefarah.gitbook.io/yq/

 ## Read a value:
 ```bash
-yq e '.a.b[0].c' file.yaml
+yq '.a.b[0].c' file.yaml
 ```

 ## Pipe from STDIN:
 ```bash
-cat file.yaml | yq e '.a.b[0].c' -
+cat file.yaml | yq '.a.b[0].c'
 ```

 ## Update a yaml file, inplace
 ```bash
-yq e -i '.a.b[0].c = "cool"' file.yaml
+yq -i '.a.b[0].c = "cool"' file.yaml
 ```

 ## Update using environment variables
 ```bash
-NAME=mike yq e -i '.a.b[0].c = strenv(NAME)' file.yaml
+NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
 ```

 ## Merge multiple files
 ```
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```
+Note the use of `ea` to evaluate all files at once (instead of in sequence.)

 ## Multiple updates to a yaml file
 ```bash
-yq e -i '
+yq -i '
  .a.b[0].c = "cool" |
  .x.y.z = "foobar" |
  .person.name = strenv(NAME)
@@ -0,0 +1,10 @@
+# Add
+
+Add behaves differently according to the type of the LHS:
+* arrays: concatenate
+* number scalars: arithmetic addition
+* string scalars: concatenate
+* maps: shallow merge (use the multiply operator (`*`) to deeply merge)
+
+Use `+=` as a relative append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+
@@ -14,7 +14,10 @@ These operators are useful to process yaml documents that have stringified embed
 | Properties |  | to_props/@props |
 | CSV |  | to_csv/@csv |
 | TSV |  | to_tsv/@tsv |
+| XML | from_xml | to_xml(i)/@xml |


 CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 

+XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
+
@@ -0,0 +1,18 @@
+# Env Variable Operators
+
+These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
+
+There are three operators:
+-  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
+- `strenv` which also takes a single environment variable name, and always parses the variable as a string.
+- `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
+
+
+## Tip
+To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
+as follows:
+
+```bash
+yq '(.. | select(tag == "!!str")) |= envsubst' file.yaml
+```
+
@@ -0,0 +1,7 @@
+# Eval
+
+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"`.
+
+Tip: This can be useful way parameterise complex scripts.
@@ -10,9 +10,10 @@ Note that when merging objects, this operator returns the merged object (not the
 ### Merge Flags
 You can control how objects are merged by using one or more of the following flags. Multiple flags can be used together, e.g. `.a *+? .b`.  See examples below

- `+` to append arrays
- `?` to only merge existing fields
- `d` to deeply merge arrays
+- `+` append arrays
+- `d` deeply merge arrays
+- `?` only merge _existing_ fields
+- `n` only merge _new_ fields

 ### Merging files
 Note the use of `eval-all` to ensure all documents are loaded into memory.
@@ -8,7 +8,7 @@ This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it
 For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:

 ```bash
-yq eval '.. style= "flow"' file.yaml
+yq '.. style= "flow"' file.yaml
 ```

 ## match values and map keys form `...`
@@ -17,5 +17,5 @@ The also includes map keys in the results set. This is particularly useful in YA
 For instance to set the `style` of all nodes in a yaml doc, including the map keys:

 ```bash
-yq eval '... style= "flow"' file.yaml
+yq '... style= "flow"' file.yaml
 ```
@@ -5,7 +5,9 @@ The Sort Keys operator sorts maps by their keys (based on their string value). T
 Sort is particularly useful for diffing two different yaml documents:

 ```bash
-yq eval -i -P 'sort_keys(..)' file1.yml
-yq eval -i -P 'sort_keys(..)' file2.yml
+yq -i -P 'sort_keys(..)' file1.yml
+yq -i -P 'sort_keys(..)' file2.yml
 diff file1.yml file2.yml
 ```
+
+Note that `yq` does not yet consider anchors when sorting by keys - this may result in invalid yaml documents if your are using merge anchors.
@@ -17,13 +17,13 @@ a: |
 Using `$( exp )` wont work, as it will trim the trailing new line.

 ```
-m=$(echo "cat\n") yq e -n '.a = strenv(m)'
+m=$(echo "cat\n") yq -n '.a = strenv(m)'
 a: cat
 ```

 However, using printf works:
 ```
-printf -v m "cat\n" ; m="$m" yq e -n '.a = strenv(m)'
+printf -v m "cat\n" ; m="$m" yq -n '.a = strenv(m)'
 a: |
  cat
 ```
@@ -31,7 +31,7 @@ a: |
 As well as having multiline expressions:
 ```
 m="cat
-"  yq e -n '.a = strenv(m)'
+"  yq -n '.a = strenv(m)'
 a: |
  cat
 ```
@@ -40,5 +40,5 @@ Similarly, if you're trying to set the content from a file, and want a trailing

 ```
 IFS= read -rd '' output < <(cat my_file)
-output=$output ./yq e '.data.values = strenv(output)' first.yml
+output=$output ./yq '.data.values = strenv(output)' first.yml
 ```
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mike Farah	93b7b6823a	Switched formatScenario parameter order for more readablity	2022-02-10 11:57:37 +11:00
Mike Farah	8bce6ff4a2	Refactored XML test to use common functions	2022-02-10 11:49:45 +11:00
Mike Farah	3ac531ce74	Fixed property decode for github actions	2022-02-10 11:34:33 +11:00
Mike Farah	e0d6b45651	Added properties round trip test	2022-02-09 13:31:51 +11:00
Mike Farah	a5ab9a8a0a	Decoder Properties	2022-02-09 13:16:59 +11:00
Mike Farah	4d4bd5114d	Removed temporary file	2022-02-09 11:49:41 +11:00
Mike Farah	bfaafa66f9	Fixed SEGV error #1096	2022-02-09 11:47:21 +11:00
Mike Farah	26356ff4be	Added github action fix for parsing xml, updated linter	2022-02-07 11:55:55 +11:00
Mike Farah	06e944dcb6	Added github action fix for parsing xml	2022-02-07 11:26:48 +11:00
Mike Farah	2891c6948d	Added expression argument to forcibly set expression if required	2022-02-07 09:27:52 +11:00
Mike Farah	703418d0c4	Automatically add "-" when piping and its missing	2022-02-07 09:09:11 +11:00
Mike Farah	75960c6484	Allow multiple files with no expression	2022-02-07 08:23:53 +11:00
Mike Farah	5ac3c57510	Fixed bug - ignore path expressions that match a directory	2022-02-07 08:04:26 +11:00
Mike Farah	926a68181b	Bumping version	2022-02-06 14:39:56 +11:00
Mike Farah	1f367ac200	Added notification banner to docs	2022-02-06 14:39:46 +11:00
Mike Farah	de38abb121	Updating release notes for next release	2022-02-04 09:27:43 +11:00
Mike Farah	d00153de71	Adding to array copies styling of previous elements #722	2022-02-04 09:24:48 +11:00
Mike Farah	992fe066aa	Improved property conversion docs	2022-02-01 15:34:17 +11:00
Mike Farah	b80080a26d	Parameterised merge array by key example	2022-02-01 15:11:39 +11:00
Mike Farah	0afb59c65e	Tests can have multiple env variables	2022-02-01 14:58:53 +11:00
Mike Farah	535799462f	Added eval operator	2022-02-01 14:47:51 +11:00
Mike Farah	77204551ab	Fixed typo in readme	2022-01-31 08:21:36 +11:00
Mike Farah	772d369058	Added notice for older versions of yq	2022-01-28 13:02:25 +11:00
Mike Farah	9b7c80a76b	Bumbing version	2022-01-28 10:06:25 +11:00
Mike Farah	a6fc7aa881	Updating docs	2022-01-28 10:06:25 +11:00
dependabot[bot]GitHubdependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	6f27cb93d1	Bump github.com/a8m/envsubst from 1.2.0 to 1.3.0 (#1089 ) Bumps [github.com/a8m/envsubst](https://github.com/a8m/envsubst) from 1.2.0 to 1.3.0. - [Release notes](https://github.com/a8m/envsubst/releases) - [Commits](https://github.com/a8m/envsubst/compare/v1.2.0...v1.3.0) --- updated-dependencies: - dependency-name: github.com/a8m/envsubst dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2022-01-27 16:21:31 +11:00
Mike Farah	b2a93930d0	Preparing release notes	2022-01-27 16:00:02 +11:00
Mike Farah	dedd1ca892	Fixing github build	2022-01-27 15:54:26 +11:00
Mike Farah	01b4917f26	Debug github build	2022-01-27 14:22:01 +11:00
Mike Farah	25e374f4ee	Debug github build	2022-01-27 14:00:55 +11:00
Mike Farah	3ba728d40c	Working around github strangeness	2022-01-27 13:54:29 +11:00
Mike Farah	8761920f58	Debug github build	2022-01-27 13:24:05 +11:00
Mike Farah	394be5c65a	Debug github build	2022-01-27 12:47:06 +11:00
Mike Farah	4ec533bc1b	No longer have to specify eval!	2022-01-27 12:07:41 +11:00
Mike Farah	fc276ff450	Smarter behaviour when piping data in with one argument	2022-01-27 10:18:46 +11:00
Mike Farah	c3d815998a	Auto style when adding to empty maps/arrays	2022-01-27 09:58:13 +11:00
Mike Farah	71242b0c8e	Fix Seg Fault on bad split expression input #1086	2022-01-27 09:29:41 +11:00
Mike Farah	a9e7f669d0	Merged envsubst into env operators	2022-01-27 09:20:53 +11:00
Samuel Cormier-IijimaandGitHub	8195ff8b9b	Add a new `envsubst` operator to replace environment variables in strings (#1082 )	2022-01-25 19:33:30 +11:00
Mike Farah	9b1a7bf451	Added support for adding objects	2022-01-23 11:35:44 +11:00
Mike Farah	9b66e0a094	Include zip file checksums in release	2022-01-23 10:45:18 +11:00
Mike Farah	6e33132de9	Added support for `*=`	2022-01-22 16:40:17 +11:00
Mike Farah	a6c79f3410	Multiply, substract with custom types	2022-01-22 16:12:59 +11:00
Mike Farah	50df792e49	Auto cast for add	2022-01-22 13:17:16 +11:00
Mike Farah	6f24e878aa	Updated README, better xml docs	2022-01-22 12:35:33 +11:00
Mike Farah	a0ba208669	Bumping release	2022-01-22 11:57:19 +11:00
Mike Farah	d5b0154747	Fixing manpage path issue	2022-01-22 11:56:21 +11:00
Phil MillerandGitHub	7d2ddc1cde	fixes path in scripts/generate-man-page-md.sh (#1075 )	2022-01-22 11:51:16 +11:00
Mike Farah	02252e8e69	Bumping version	2022-01-22 11:48:08 +11:00
Mike Farah	2526b03d67	Added JSON conversion tests and doc generation	2022-01-21 20:26:19 +11:00
Eng Zer JunandGitHub	e347090571	refactor: move from io/ioutil to io and os packages (#1068 ) * refactor: move from io/ioutil to io and os packages The io/ioutil package has been deprecated as of Go 1.16, see https://golang.org/doc/go1.16#ioutil. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. Signed-off-by: Eng Zer Jun <engzerjun@gmail.com> * build: update snapcraft `go-channel` to 1.17 Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>	2022-01-21 19:50:53 +11:00
dependabot[bot]GitHubdependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	f8bcaca4c9	Bump github.com/jinzhu/copier from 0.3.4 to 0.3.5 (#1071 ) Bumps [github.com/jinzhu/copier](https://github.com/jinzhu/copier) from 0.3.4 to 0.3.5. - [Release notes](https://github.com/jinzhu/copier/releases) - [Commits](https://github.com/jinzhu/copier/compare/v0.3.4...v0.3.5) --- updated-dependencies: - dependency-name: github.com/jinzhu/copier 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>	2022-01-21 18:36:33 +11:00
Mike Farah	de0716e875	Tweaking select docs	2022-01-15 18:22:26 +11:00
Mike Farah	21cdbab0d7	Improving select docs (#839 )	2022-01-15 18:18:52 +11:00
Mike Farah	1fba46f2f7	Updated readme as per #1051 recommendations	2022-01-15 17:54:08 +11:00
Mike Farah	dfe4308304	Preparing release notes	2022-01-15 17:45:45 +11:00
Mike Farah	8c94a96ee0	New merge flag (n) to only merge in new fields (#1038 )	2022-01-15 15:48:34 +11:00
Mike FarahandGitHub	ec8ef312ef	Added XML encoding/decoding (#1067 ) * Added XML encoding/decoding * Minor fixes * Improve yq doc * Lint	2022-01-15 11:57:59 +11:00
Mike Farah	606ef91cc6	Better fix #1062 (return error instead of panic)	2022-01-14 15:40:24 +11:00
Mike Farah	78b45a3eb0	Fixed #1062	2022-01-14 15:22:55 +11:00
Mike Farah	84ddf1862f	Fixed #1048	2022-01-14 14:55:25 +11:00
dependabot[bot]GitHubdependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2d7c63e4e4	Bump github.com/goccy/go-yaml from 1.9.4 to 1.9.5 (#1065 ) Bumps [github.com/goccy/go-yaml](https://github.com/goccy/go-yaml) from 1.9.4 to 1.9.5. - [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/v1.9.4...v1.9.5) --- 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>	2022-01-14 13:33:30 +11:00
HélioandGitHub	eac75f7dad	Arch Linux install instructions (#1059 )	2022-01-03 09:20:38 +11:00
robertomierandGitHub	5e30f3ba90	Update changelog for version v4.16.2 (#1046 ) * Update changelog for version v4.16.2 * fix: remove useless changelog comments from debian changelog	2022-01-03 09:20:13 +11:00
robertomierandGitHub	0b49bebad9	chore: script to build the deb sources (#1045 ) * chore: script to build the deb sources now it includes the man files. This script makes only sense executing on the machine having the gpg key needed to sign and push to ppa * fix: dput dependency and proper configuration	2021-12-23 11:43:21 +11:00
Mike Farah	c48b1612df	Updating cli docs	2021-12-21 17:07:32 +11:00
Mike Farah	6763ae6e7b	Added xml acceptance tests	2021-12-21 17:05:33 +11:00
Mike Farah	ca1c5dab59	Can encode in XML!	2021-12-21 16:59:09 +11:00
Mike Farah	2ee9c65bc2	Added global xml prefs for simplicity	2021-12-21 16:52:54 +11:00
Mike Farah	6bcbd873a6	wip	2021-12-21 16:19:27 +11:00
Mike Farah	ae8df5ea87	wip	2021-12-21 16:08:37 +11:00
Mike Farah	851a43b9b6	wip	2021-12-21 15:56:08 +11:00
Mike FarahandGitHub	df32baedf1	Added XML decoder (#1044 )	2021-12-21 15:02:07 +11:00