Bump version

alias, anchor and explode ops are now all documented together

.github/ISSUE_TEMPLATE/bug_report_v3.md

@@ -1,8 +1,8 @@
 ---
-name: Bug report
+name: Bug report - V3
 about: Create a report to help us improve
 title: ''
-labels: bug
+labels: bug, v3
 assignees: ''
 
 ---
@@ -10,11 +10,14 @@ assignees: ''
 **Describe the bug**
 A clear and concise description of what the bug is.
 
-version of yq: 
-operating system:
+Note that any how to questions should be posted in the discussion board and not raised as an issue.
+
+Version of yq: 3.X.X
+Operating system: mac/linux/windows/....
+Installed via: docker/binary release/homebrew/snap/...
 
 **Input Yaml**
-Concise yaml document(s) (as simple as possible to show the bug)
+Concise yaml document(s) (as simple as possible to show the bug, please keep it to 10 lines or less)
 data1.yml:
 ```yaml
 this: should really work

.github/ISSUE_TEMPLATE/bug_report_v4.md

@@ -0,0 +1,51 @@
+---
+name: Bug report - V4
+about: Create a report to help us improve
+title: ''
+labels: bug, v4
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+Note that any how to questions should be posted in the discussion board and not raised as an issue.
+
+Version of yq: 4.X.X
+Operating system: mac/linux/windows/....
+Installed via: docker/binary release/homebrew/snap/...
+
+**Input Yaml**
+Concise yaml document(s) (as simple as possible to show the bug, please keep it to 10 lines or less)
+data1.yml:
+```yaml
+this: should really work
+```
+
+data2.yml:
+```yaml
+but: it strangely didn't
+```
+
+**Command**
+The command you ran:
+```
+yq eval-all 'select(fileIndex==0) | .a.b.c' data1.yml data2.yml
+```
+
+**Actual behavior**
+
+```yaml
+cat: meow
+```
+
+**Expected behavior**
+
+```yaml
+this: should really work
+but: it strangely didn't
+```
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,17 +1,23 @@
 ---
-name: Feature request
+name: Feature request - V4
 about: Suggest an idea for this project
 title: ''
-labels: enhancement
+labels: enhancement, v4
 assignees: ''
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+**Please describe your feature request.**
+A clear and concise description of what the request is and what it would solve. 
+Eg. I wish I could use yq to [...]
+
+Note:
+- how to questions should be posted in the discussion board and not raised as an issue.
+- V3 will no longer have any enhancements.
 
 **Describe the solution you'd like**
 If we have data1.yml like:
+(please keep to around 10 lines )
 
 ```yaml
 country: Australia
@@ -20,7 +26,7 @@ country: Australia
 And we run a command:
 
 ```bash
-yq predictWeather data1.yml
+yq eval 'predictWeatherOf(.country)'
 ```
 
 it could output

.github/workflows/go.yml

@@ -28,7 +28,4 @@ jobs:
       run: |
         export PATH=${PATH}:`go env GOPATH`/bin
         scripts/devtools.sh
-    - name: Build
-      run: |
-        export PATH=${PATH}:`go env GOPATH`/bin
         make local build

.github/workflows/release.yml

@@ -0,0 +1,80 @@
+name: Release YQ
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publishGitRelease:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '^1.15'
+      - name: Cross compile
+        run: |
+          sudo apt-get install rhash -y
+          go get github.com/mitchellh/gox
+          ./scripts/xcompile.sh
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1.0.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: true
+          prerelease: false
+
+      - uses: shogo82148/actions-upload-release-asset@v1
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: build/*
+
+  publishDocker:
+    environment: dockerhub
+    env:
+      IMAGE_NAME: mikefarah/yq
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get latest release tag      
+        uses: oprypin/find-latest-tag@v1
+        with:
+          repository: mikefarah/yq  # The repository to scan.
+          releases-only: true  # We know that all relevant tags have a GitHub release for them.
+        id: yq  
+        
+      - name: Clone source code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ steps.yq.outputs.tag }}
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+  
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
+ 
+      - name: Build and push image
+        run: |
+          IMAGE_V_VERSION="$(git describe --tags --abbrev=0)"
+          IMAGE_VERSION=${IMAGE_V_VERSION:1}
+
+          SHORT_SHA1=$(git rev-parse --short HEAD)
+          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
+          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
+          echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin
+          docker buildx build --platform "${PLATFORMS}" -t "${IMAGE_NAME}:${IMAGE_VERSION}"  -t "${IMAGE_NAME}:latest" -t "${IMAGE_NAME}:4" \
+            --push .
+    

Dockerfile

@@ -12,7 +12,7 @@ RUN CGO_ENABLED=0 make local build
 
 # Choose alpine as a base image to make this useful for CI, as many
 # CI tools expect an interactive shell inside the container
-FROM alpine:3.12 as production
+FROM alpine:3.12.3 as production
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
 RUN chmod +x /usr/bin/yq

Dockerfile.dev

@@ -4,6 +4,7 @@ COPY scripts/devtools.sh /opt/devtools.sh
 
 RUN set -e -x \
     && /opt/devtools.sh
+ENV PATH=/go/bin:$PATH
 
 # install mkdocs
 RUN set -ex \

README.md

@@ -3,60 +3,88 @@
 ![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
+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.
 
-The aim of the project is to be the [jq](https://github.com/stedolan/jq) or sed of yaml files.
+yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as docker, all listed below.
+
+## V4 released!
+V4 is now officially released, it's quite different from V3 (sorry for the migration), however it is much more similar to ```jq```, using a similar expression syntax and therefore support much more complex functionality! 
+
+If you've been using v3 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/v/v4.x/upgrading-from-v3).
+
+Support for v3 will cease August 2021, until then, critical bug and security fixes will still get applied if required.
 
 ## Install
 
 ### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)
 
-### MacOS:
+### wget
+Use wget to download the pre-compiled binaries:
+
+#### Compressed via tar.gz
+```bash
+wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY}.tar.gz -O - |\
+  tar xz && mv ${BINARY} /usr/bin/yq
+```
+
+#### Plain binary
+
+```bash
+wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /usr/bin/yq &&\
+    chmod +x /usr/bin/yq
+```
+
+For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64
+
+### MacOS / Linux via Homebrew:
+Using [Homebrew](https://brew.sh/)
 ```
 brew install yq
 ```
 
-### Ubuntu and other Linux distros supporting `snap` packages:
+or, for the (deprecated) v3 version:
+
+```
+brew install yq@3
+```
+
+Note that for v3, as it is a versioned brew it will not add the `yq` command to your path automatically. Please follow the instructions given by brew upon installation.
+
+### Linux via snap:
 ```
 snap install yq
 ```
 
+or, for the (deprecated) v3 version:
+
+```
+snap install yq --channel=v3/stable
+```
+
 #### Snap notes
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:
 
 ```
-sudo cat /etc/myfile | yq r - a.path
+sudo cat /etc/myfile | yq e '.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 w - a.path value | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq w - a.path value | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
 
-### wget
-
-Use wget to download the pre-compiled binaries:
-
-```bash
-wget https://github.com/mikefarah/yq/releases/download/{VERSION}/{BINARY} -O /usr/bin/yq &&\
-    chmod +x /usr/bin/yq
-```
-
-For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
-
-
 ### Run with Docker
 
 #### Oneshot use:
 
 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq yq [flags] <command> FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
 ```
 
 #### Run commands interactively:
@@ -69,18 +97,26 @@ It can be useful to have a bash function to avoid typing the whole docker comman
 
 ```bash
 yq() {
-  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq yq "$@"
+  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```
 
 ### Go Get:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v3
+GO111MODULE=on go get github.com/mikefarah/yq
 ```
 
 ## Community Supported Installation methods
 As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.
 
+# Webi
+
+```
+webi yq
+```
+
+See [webi](https://webinstall.dev/)
+Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)
 
 ### Windows:
 ```
@@ -88,6 +124,14 @@ choco install yq
 ```
 Supported by @chillum (https://chocolatey.org/packages/yq)
 
+### Mac:
+Using [MacPorts](https://www.macports.org/)
+```
+sudo port selfupdate
+sudo port install yq
+```
+Supported by @herbygillot (https://ports.macports.org/maintainer/github/herbygillot)
+
 ### Alpine Linux
 - Enable edge/community repo by adding ```$MIRROR/alpine/edge/community``` to ```/etc/apk/repositories```
 - Update database index with ```apk update```
@@ -108,22 +152,18 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 
 ## Features
 - Written in portable go, so you can download a lovely dependency free binary
-- [Colorize the output](https://mikefarah.gitbook.io/yq/usage/output-format#colorize-output)
-- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/commands/read#basic)
-- [List matching paths of a given path expression](https://mikefarah.gitbook.io/yq/commands/read#path-only)
-- [Return the lengths of arrays/object/scalars](https://mikefarah.gitbook.io/yq/commands/read#printing-length-of-the-results)
-- Update a yaml file given a [path expression](https://mikefarah.gitbook.io/yq/commands/write-update#basic) or [script file](https://mikefarah.gitbook.io/yq/commands/write-update#basic)
-- Update creates any missing entries in the path on the fly
-- Deeply [compare](https://mikefarah.gitbook.io/yq/commands/compare) yaml files
-- Keeps yaml formatting and comments when updating
-- [Validate a yaml file](https://mikefarah.gitbook.io/yq/commands/validate)
-- Create a yaml file given a [deep path and value](https://mikefarah.gitbook.io/yq/commands/create#creating-a-simple-yaml-file) or a [script file](https://mikefarah.gitbook.io/yq/commands/create#creating-using-a-create-script)
-- [Prefix a path to a yaml file](https://mikefarah.gitbook.io/yq/commands/prefix)
-- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/usage/convert)
-- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/commands/read#from-stdin)
-- [Merge](https://mikefarah.gitbook.io/yq/commands/merge) multiple yaml files with various options for [overriding](https://mikefarah.gitbook.io/yq/commands/merge#overwrite-values) and [appending](https://mikefarah.gitbook.io/yq/commands/merge#append-values-with-arrays)
-- Supports multiple documents in a single yaml file for [reading](https://mikefarah.gitbook.io/yq/commands/read#multiple-documents), [writing](https://mikefarah.gitbook.io/yq/commands/write-update#multiple-documents) and [merging](https://mikefarah.gitbook.io/yq/commands/merge#multiple-documents)
-- General shell completion scripts (bash/zsh/fish/powershell) (https://mikefarah.gitbook.io/yq/commands/shell-completion)
+- Uses similar syntax as `jq` but works with YAML and JSON files
+- Fully supports multi document yaml files
+- Colorized yaml output
+- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
+- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/v/v4.x/sort-keys)
+- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/comment-operators), [styling](https://mikefarah.gitbook.io/yq/style), [tags](https://mikefarah.gitbook.io/yq/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/anchor-and-alias-operators).
+- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
+- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/v/v4.x/select#select-and-update-matching-values-in-map)
+- Keeps yaml formatting and comments when updating (though there are issues with whitespace)
+- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
+- [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)
 
 ## [Usage](https://mikefarah.gitbook.io/yq/)
 
@@ -135,32 +175,33 @@ Usage:
   yq [command]
 
 Available Commands:
-  compare          yq x [--prettyPrint/-P] dataA.yaml dataB.yaml 'b.e(name==fr*).value'
-  delete           yq d [--inplace/-i] [--doc/-d index] sample.yaml 'b.e(name==fred)'
+  eval             Apply expression to each document in each yaml file given in sequence
+  eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
   help             Help about any command
-  merge            yq m [--inplace/-i] [--doc/-d index] [--overwrite/-x] [--append/-a] sample.yaml sample2.yaml
-  new              yq n [--script/-s script_file] a.b.c newValue
-  prefix           yq p [--inplace/-i] [--doc/-d index] sample.yaml a.b.c
-  read             yq r [--printMode/-p pv] sample.yaml 'b.e(name==fr*).value'
-  shell-completion Generates shell completion scripts
-  validate         yq v sample.yaml
-  write            yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml 'b.e(name==fr*).value' newValue
+  shell-completion Generate completion script
 
 Flags:
-  -C, --colors        print with colors
+  -C, --colors        force print with colors
+  -e, --exit-status   set exit status if there are no matches or null or false is returned
   -h, --help          help for yq
   -I, --indent int    sets indent level for output (default 2)
-  -P, --prettyPrint   pretty print
-  -j, --tojson        output as json. By default it prints a json document in one line, use the prettyPrint flag to print a formatted doc.
+  -i, --inplace       update the yaml file inplace of first yaml file given.
+  -M, --no-colors     force print with no colors
+  -N, --no-doc        Don't print document separators (---)
+  -n, --null-input    Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
+  -P, --prettyPrint    pretty print, shorthand for '... style = ""' 
+  -j, --tojson        output as json. Set indent to 0 to print json in one line.
   -v, --verbose       verbose mode
   -V, --version       Print version information and quit
 
 Use "yq [command] --help" for more information about a command.
 ```
 
-## Upgrade from V2
-If you've been using v2 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/upgrading-from-v2).
+Simple Example:
+
+```bash
+yq e '.a.b | length' f1.yml f2.yml 
+```
 
 ## Known Issues / Missing Features
 - `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
-- You cannot (yet) select multiple paths/keys from the yaml to be printed out (https://github.com/mikefarah/yq/issues/287)

cmd/constant.go

@@ -2,10 +2,10 @@ package cmd
 
 var unwrapScalar = true
 
-// var writeInplace = false
+var writeInplace = false
 var outputToJSON = false
 
-// var exitStatus = false
+var exitStatus = false
 var forceColor = false
 var forceNoColor = false
 var colorsEnabled = false
@@ -14,5 +14,6 @@ var noDocSeparators = false
 var nullInput = false
 var verbose = false
 var version = false
+var prettyPrint = false
 
-// var log = logging.MustGetLogger("yq")
+var completedSuccessfully = false

cmd/evaluate_all_command.go

@@ -1,6 +1,8 @@
 package cmd
 
 import (
+	"errors"
+	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -13,9 +15,8 @@ func createEvaluateAllCommand() *cobra.Command {
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
-yq es < sample.yaml
-yq es -n '{"a": "b"}'
+# merges f2.yml into f1.yml (inplace)
+yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
 `,
 		Long: "Evaluate All:\nUseful when you need to run an expression across several yaml documents or files. Consumes more memory than eval",
 		RunE: evaluateAll,
@@ -23,6 +24,7 @@ yq es -n '{"a": "b"}'
 	return cmdEvalAll
 }
 func evaluateAll(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -39,26 +41,54 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
 		colorsEnabled = true
 	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
+	if writeInplace {
+		// only use colors if its forced
+		colorsEnabled = forceColor
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
+		out, err = writeInPlaceHandler.CreateTempFile()
+		if err != nil {
+			return err
+		}
+		// need to indirectly call the function so  that completedSuccessfully is
+		// passed when we finish execution as opposed to now
+		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+	}
+
+	if nullInput && len(args) > 1 {
+		return errors.New("Cannot pass files in when using null-input flag")
+	}
+
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = allAtOnceEvaluator.EvaluateFiles("", []string{"-"}, printer)
+			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = allAtOnceEvaluator.EvaluateFiles(args[0], []string{}, printer)
+			err = yqlib.NewStreamEvaluator().EvaluateNew(processExpression(args[0]), printer)
 		} else {
-			err = allAtOnceEvaluator.EvaluateFiles("", []string{args[0]}, printer)
+			err = allAtOnceEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer)
 		}
 	default:
-		err = allAtOnceEvaluator.EvaluateFiles(args[0], args[1:], printer)
+		err = allAtOnceEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer)
+	}
+
+	completedSuccessfully = err == nil
+
+	if err == nil && exitStatus && !printer.PrintedAnything() {
+		return errors.New("no matches found")
 	}
 
-	cmd.SilenceUsage = true
 	return err
 }

cmd/evalute_sequence_command.go

@@ -1,6 +1,8 @@
 package cmd
 
 import (
+	"errors"
+	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -13,16 +15,36 @@ func createEvaluateSequenceCommand() *cobra.Command {
 		Aliases: []string{"e"},
 		Short:   "Apply expression to each document in each yaml file given in sequence",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
-yq es < sample.yaml
-yq es -n '{"a": "b"}'
+# runs the expression against each file, in series
+yq e '.a.b | length' f1.yml f2.yml 
+
+# prints out the file
+yq e sample.yaml 
+
+# prints a new yaml document
+yq e -n '.a.b.c = "cat"' 
+
+
+# updates file.yaml directly
+yq e '.a.b = "cool"' -i file.yaml 
 `,
 		Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
 		RunE: evaluateSequence,
 	}
 	return cmdEvalSequence
 }
+
+func processExpression(expression string) string {
+	if prettyPrint && expression == "" {
+		return `... style=""`
+	} else if prettyPrint {
+		return fmt.Sprintf("%v | ... style= \"\"", expression)
+	}
+	return expression
+}
+
 func evaluateSequence(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -39,29 +61,54 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
 		colorsEnabled = true
 	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
+	if writeInplace {
+		// only use colors if its forced
+		colorsEnabled = forceColor
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
+		out, err = writeInPlaceHandler.CreateTempFile()
+		if err != nil {
+			return err
+		}
+		// need to indirectly call the function so  that completedSuccessfully is
+		// passed when we finish execution as opposed to now
+		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+	}
+
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
 
 	streamEvaluator := yqlib.NewStreamEvaluator()
-	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
+
+	if nullInput && len(args) > 1 {
+		return errors.New("Cannot pass files in when using null-input flag")
+	}
 
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = streamEvaluator.EvaluateFiles("", []string{"-"}, printer)
+			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = allAtOnceEvaluator.EvaluateFiles(args[0], []string{}, printer)
+			err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer)
 		} else {
-			err = streamEvaluator.EvaluateFiles("", []string{args[0]}, printer)
+			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer)
 		}
 	default:
 		err = streamEvaluator.EvaluateFiles(args[0], args[1:], printer)
 	}
+	completedSuccessfully = err == nil
+
+	if err == nil && exitStatus && !printer.PrintedAnything() {
+		return errors.New("no matches found")
+	}
 
-	cmd.SilenceUsage = true
 	return err
 }

cmd/root.go

@@ -46,6 +46,10 @@ func New() *cobra.Command {
 
 	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(&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")
 
 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.0.0-alpha2"
+	Version = "4.3.0"
 
 	// 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

cmd/write.go

@@ -1,61 +0,0 @@
-package cmd
-
-// import (
-// 	"github.com/spf13/cobra"
-// )
-
-// func createWriteCmd() *cobra.Command {
-// 	var cmdWrite = &cobra.Command{
-// 		Use:     "write [yaml_file] [path_expression] [value]",
-// 		Aliases: []string{"w"},
-// 		Short:   "yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml 'b.e(name==fr*).value' newValue",
-// 		Example: `
-// yq write things.yaml 'a.b.c' true
-// yq write things.yaml 'a.*.c' true
-// yq write things.yaml 'a.**' true
-// yq write things.yaml 'a.(child.subchild==co*).c' true
-// yq write things.yaml 'a.b.c' --tag '!!str' true # force 'true' to be interpreted as a string instead of bool
-// yq write things.yaml 'a.b.c' --tag '!!float' 3
-// yq write --inplace -- things.yaml 'a.b.c' '--cat' # need to use '--' to stop processing arguments as flags
-// yq w -i things.yaml 'a.b.c' cat
-// yq w -i -s update_script.yaml things.yaml
-// yq w things.yaml 'a.b.d[+]' foo # appends a new node to the 'd' array
-// yq w --doc 2 things.yaml 'a.b.d[+]' foo # updates the 3rd document of the yaml file
-//       `,
-// 		Long: `Updates the yaml file w.r.t the given path and value.
-// Outputs to STDOUT unless the inplace flag is used, in which case the file is updated instead.
-
-// Append value to array adds the value to the end of array.
-
-// Update Scripts:
-// Note that you can give an update script to perform more sophisticated update. Update script
-// format is list of update commands (update or delete) like so:
-// ---
-// - command: update
-//   path: b.c
-//   value:
-//     #great
-//     things: frog # wow!
-// - command: delete
-//   path: b.d
-// `,
-// 		RunE: writeProperty,
-// 	}
-// 	cmdWrite.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
-// 	cmdWrite.PersistentFlags().StringVarP(&writeScript, "script", "s", "", "yaml script for updating yaml")
-// 	cmdWrite.PersistentFlags().StringVarP(&sourceYamlFile, "from", "f", "", "yaml file for updating yaml (as-is)")
-// 	cmdWrite.PersistentFlags().StringVarP(&customTag, "tag", "t", "", "set yaml tag (e.g. !!int)")
-// 	cmdWrite.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
-// 	cmdWrite.PersistentFlags().StringVarP(&customStyle, "style", "", "", "formatting style of the value: single, double, folded, flow, literal, tagged")
-// 	cmdWrite.PersistentFlags().StringVarP(&anchorName, "anchorName", "", "", "anchor name")
-// 	cmdWrite.PersistentFlags().BoolVarP(&makeAlias, "makeAlias", "", false, "create an alias using the value as the anchor name")
-// 	return cmdWrite
-// }
-
-// func writeProperty(cmd *cobra.Command, args []string) error {
-// 	var updateCommands, updateCommandsError = readUpdateCommands(args, 3, "Must provide <filename> <path_to_update> <value>", true)
-// 	if updateCommandsError != nil {
-// 		return updateCommandsError
-// 	}
-// 	return updateDoc(args[0], updateCommands, cmd.OutOrStdout())
-// }

cmd/write_test.go

@@ -1,610 +0,0 @@
-package cmd
-
-// import (
-// 	"fmt"
-// 	"runtime"
-// 	"strings"
-// 	"testing"
-
-// 	"github.com/mikefarah/yq/v3/test"
-// )
-
-// func TestWriteCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteKeepCommentsCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3 # comment
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7 # comment
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithTaggedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --tag=!!str --style=tagged", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: !!str cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithDoubleQuotedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=double", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: "cat"
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteUpdateStyleOnlyCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-//   d: things
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* --style=single", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 'dog'
-//   d: 'things'
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteUpdateTagOnlyCmd(t *testing.T) {
-// 	content := `b:
-//   c: true
-//   d: false
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* --tag=!!str", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: "true"
-//   d: "false"
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithSingleQuotedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=single", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 'cat'
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithLiteralStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=literal", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: |-
-//     cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithFoldedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=folded", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: >-
-//     cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteEmptyMultiDocCmd(t *testing.T) {
-// 	content := `# this is empty
-// ---
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `c: 7
-
-// # this is empty
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteSurroundingEmptyMultiDocCmd(t *testing.T) {
-// 	content := `---
-// # empty
-// ---
-// cat: frog
-// ---
-
-// # empty
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d1 c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `
-
-// # empty
-// ---
-// cat: frog
-// c: 7
-// ---
-
-// # empty
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteFromFileCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	source := `kittens: are cute # sure are!`
-// 	fromFilename := test.WriteTempYamlFile(source)
-// 	defer test.RemoveTempYamlFile(fromFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c -f %s", filename, fromFilename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c:
-//     kittens: are cute # sure are!
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteEmptyCmd(t *testing.T) {
-// 	content := ``
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteAutoCreateCmd(t *testing.T) {
-// 	content := `applications:
-//   - name: app
-//     env:`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s applications[0].env.hello world", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `applications:
-//   - name: app
-//     env:
-//       hello: world
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmdScript(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	updateScript := `- command: update
-//   path: b.c
-//   value: 7`
-// 	scriptFilename := test.WriteTempYamlFile(updateScript)
-// 	defer test.RemoveTempYamlFile(scriptFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write --script %s %s", scriptFilename, filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmdEmptyScript(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	updateScript := ``
-// 	scriptFilename := test.WriteTempYamlFile(updateScript)
-// 	defer test.RemoveTempYamlFile(scriptFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write --script %s %s", scriptFilename, filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteMultiCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// ---
-// apples: great
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d 1 apples ok", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// ---
-// apples: ok
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-// func TestWriteInvalidDocumentIndexCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -df apples ok", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to invalid path")
-// 	}
-// 	expectedOutput := `Document index f is not a integer or *: strconv.ParseInt: parsing "f": invalid syntax`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteBadDocumentIndexCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d 1 apples ok", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to invalid path")
-// 	}
-// 	expectedOutput := `asked to process document index 1 but there are only 1 document(s)`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-// func TestWriteMultiAllCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// ---
-// apples: great
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d * apples ok", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// apples: ok
-// ---
-// apples: ok`
-// 	test.AssertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
-// }
-
-// func TestWriteCmd_EmptyArray(t *testing.T) {
-// 	content := `b: 3`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s a []", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b: 3
-// a: []
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_Error(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "write")
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to missing arg")
-// 	}
-// 	expectedOutput := `Must provide <filename> <path_to_update> <value>`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteCmd_ErrorUnreadableFile(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "write fake-unknown a.b 3")
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to unknown file")
-// 	}
-// 	var expectedOutput string
-// 	if runtime.GOOS == "windows" {
-// 		expectedOutput = `open fake-unknown: The system cannot find the file specified.`
-// 	} else {
-// 		expectedOutput = `open fake-unknown: no such file or directory`
-// 	}
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteCmd_Inplace(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write -i %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	gotOutput := test.ReadTempYamlFile(filename)
-// 	expectedOutput := `b:
-//   c: 7`
-// 	test.AssertResult(t, expectedOutput, strings.Trim(gotOutput, "\n "))
-// }
-
-// func TestWriteCmd_InplaceError(t *testing.T) {
-// 	content := `b: cat
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write -i %s b.c 7", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected Error to occur!")
-// 	}
-// 	gotOutput := test.ReadTempYamlFile(filename)
-// 	test.AssertResult(t, content, gotOutput)
-// }
-
-// func TestWriteCmd_Append(t *testing.T) {
-// 	content := `b:
-//   - foo
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - foo
-//   - 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendInline(t *testing.T) {
-// 	content := `b: [foo]`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b: [foo, 7]
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendInlinePretty(t *testing.T) {
-// 	content := `b: [foo]`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -P b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - foo
-//   - 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendEmptyArray(t *testing.T) {
-// 	content := `a: 2
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] v", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `a: 2
-// b:
-//   - v
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatArray(t *testing.T) {
-// 	content := `b:
-// - c: thing
-// - c: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[*].c new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - c: new
-//   - c: new
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatMap(t *testing.T) {
-// 	content := `b:
-//   c: thing
-//   d: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: new
-//   d: new
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatMapEmpty(t *testing.T) {
-// 	content := `b:
-//   c: thing
-//   d: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c.* new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: {}
-//   d: another thing
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }

github-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM mikefarah/yq:3
+FROM mikefarah/yq:4.3.0
 
 COPY entrypoint.sh /entrypoint.sh
 

go.mod

@@ -2,18 +2,15 @@ module github.com/mikefarah/yq/v4
 
 require (
 	github.com/elliotchance/orderedmap v1.3.0
-	github.com/fatih/color v1.9.0
-	github.com/goccy/go-yaml v1.8.1
-	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
-	github.com/mattn/go-colorable v0.1.7 // indirect
-	github.com/spf13/cobra v1.0.0
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/fatih/color v1.10.0
+	github.com/goccy/go-yaml v1.8.4
+	github.com/jinzhu/copier v0.1.0
+	github.com/spf13/cobra v1.1.1
 	github.com/timtadh/data-structures v0.5.3 // indirect
 	github.com/timtadh/lexmachine v0.2.2
-	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/sys v0.0.0-20210105210732-16f7687f5001 // indirect
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
 go 1.15

go.sum

@@ -1,16 +1,33 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
@@ -22,37 +39,74 @@ github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8
 github.com/elliotchance/orderedmap v1.3.0 h1:k6m77/d0zCXTjsk12nX40TkEBkSICq8T4s6R6bpCqU0=
 github.com/elliotchance/orderedmap v1.3.0/go.mod h1:8hdSl6jmveQw8ScByd3AaNHNk51RhbTazdqtTty+NFw=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
-github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
-github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
+github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg=
+github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/goccy/go-yaml v1.8.1 h1:JuZRFlqLM5cWF6A+waL8AKVuCcqvKOuhJtUQI+L3ez0=
-github.com/goccy/go-yaml v1.8.1/go.mod h1:wS4gNoLalDSJxo/SpngzPQ2BN4uuZVLCmbM4S3vd4+Y=
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-github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
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 github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
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 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
@@ -183,6 +320,13 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
-gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

pkg/yqlib/candidate_node.go

@@ -21,6 +21,14 @@ func (n *CandidateNode) GetKey() string {
 	return fmt.Sprintf("%v - %v", n.Document, n.Path)
 }
 
+func (n *CandidateNode) CreateChildPath(path interface{}) []interface{} {
+	//don't use append as they may actually modify the path of the orignal node!
+	newPath := make([]interface{}, len(n.Path)+1)
+	copy(newPath, n.Path)
+	newPath[len(n.Path)] = path
+	return newPath
+}
+
 func (n *CandidateNode) Copy() (*CandidateNode, error) {
 	clone := &CandidateNode{}
 	err := copier.Copy(clone, n)
@@ -32,6 +40,7 @@ func (n *CandidateNode) Copy() (*CandidateNode, error) {
 
 // updates this candidate from the given candidate node
 func (n *CandidateNode) UpdateFrom(other *CandidateNode) {
+
 	n.UpdateAttributesFrom(other)
 	n.Node.Content = other.Node.Content
 	n.Node.Value = other.Node.Value

pkg/yqlib/constants.go

@@ -1,5 +0,0 @@
-package yqlib
-
-import "gopkg.in/op/go-logging.v1"
-
-var log = logging.MustGetLogger("yq-lib")

pkg/yqlib/doc/.gitignore

@@ -0,0 +1 @@
+*.zip

pkg/yqlib/doc/Add.md

@@ -2,6 +2,32 @@ Add behaves differently according to the type of the LHS:
 - arrays: concatenate
 - number scalars: arithmetic addition (soon)
 - string scalars: concatenate (soon)
+
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.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
+```
+
 ## Concatenate arrays
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Alternative (Default value).md

@@ -0,0 +1,73 @@
+This operator is used to provide alternative (or default) values when a particular expression is either null or false.
+
+## LHS is defined
+Given a sample.yml file of:
+```yaml
+a: bridge
+```
+then
+```bash
+yq eval '.a // "hello"' sample.yml
+```
+will output
+```yaml
+bridge
+```
+
+## LHS is not defined
+Given a sample.yml file of:
+```yaml
+{}
+```
+then
+```bash
+yq eval '.a // "hello"' sample.yml
+```
+will output
+```yaml
+hello
+```
+
+## LHS is null
+Given a sample.yml file of:
+```yaml
+a: ~
+```
+then
+```bash
+yq eval '.a // "hello"' sample.yml
+```
+will output
+```yaml
+hello
+```
+
+## LHS is false
+Given a sample.yml file of:
+```yaml
+a: false
+```
+then
+```bash
+yq eval '.a // "hello"' sample.yml
+```
+will output
+```yaml
+hello
+```
+
+## RHS is an expression
+Given a sample.yml file of:
+```yaml
+a: false
+b: cat
+```
+then
+```bash
+yq eval '.a // .b' sample.yml
+```
+will output
+```yaml
+cat
+```
+

pkg/yqlib/doc/Anchor and Alias Operators.md

@@ -0,0 +1,194 @@
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference aliases and remove anchor names).
+
+`yq` supports merge aliases (like `<<: *blah`) however this is no longer in the standard yaml spec (1.2) and so `yq` will automatically add the `!!merge` tag to these nodes as it is effectively a custom tag.
+
+
+## Get anchor
+Given a sample.yml file of:
+```yaml
+a: &billyBob cat
+```
+then
+```bash
+yq eval '.a | anchor' sample.yml
+```
+will output
+```yaml
+billyBob
+```
+
+## Set anchor
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a anchor = "foobar"' sample.yml
+```
+will output
+```yaml
+a: &foobar cat
+```
+
+## Set anchor relatively using assign-update
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a anchor |= .b' sample.yml
+```
+will output
+```yaml
+a: &cat
+  b: cat
+```
+
+## Get alias
+Given a sample.yml file of:
+```yaml
+b: &billyBob meow
+a: *billyBob
+```
+then
+```bash
+yq eval '.a | alias' sample.yml
+```
+will output
+```yaml
+billyBob
+```
+
+## Set alias
+Given a sample.yml file of:
+```yaml
+b: &meow purr
+a: cat
+```
+then
+```bash
+yq eval '.a alias = "meow"' sample.yml
+```
+will output
+```yaml
+b: &meow purr
+a: *meow
+```
+
+## Set alias relatively using assign-update
+Given a sample.yml file of:
+```yaml
+b: &meow purr
+a:
+  f: meow
+```
+then
+```bash
+yq eval '.a alias |= .f' sample.yml
+```
+will output
+```yaml
+b: &meow purr
+a: *meow
+```
+
+## Explode alias and anchor
+Given a sample.yml file of:
+```yaml
+f:
+  a: &a cat
+  b: *a
+```
+then
+```bash
+yq eval 'explode(.f)' sample.yml
+```
+will output
+```yaml
+f:
+  a: cat
+  b: cat
+```
+
+## Explode with no aliases or anchors
+Given a sample.yml file of:
+```yaml
+a: mike
+```
+then
+```bash
+yq eval 'explode(.a)' sample.yml
+```
+will output
+```yaml
+a: mike
+```
+
+## Explode with alias keys
+Given a sample.yml file of:
+```yaml
+f:
+  a: &a cat
+  *a: b
+```
+then
+```bash
+yq eval 'explode(.f)' sample.yml
+```
+will output
+```yaml
+f:
+  a: cat
+  cat: b
+```
+
+## Explode with merge anchors
+Given a sample.yml file of:
+```yaml
+foo: &foo
+  a: foo_a
+  thing: foo_thing
+  c: foo_c
+bar: &bar
+  b: bar_b
+  thing: bar_thing
+  c: bar_c
+foobarList:
+  b: foobarList_b
+  !!merge <<:
+    - *foo
+    - *bar
+  c: foobarList_c
+foobar:
+  c: foobar_c
+  !!merge <<: *foo
+  thing: foobar_thing
+```
+then
+```bash
+yq eval 'explode(.)' sample.yml
+```
+will output
+```yaml
+foo:
+  a: foo_a
+  thing: foo_thing
+  c: foo_c
+bar:
+  b: bar_b
+  thing: bar_thing
+  c: bar_c
+foobarList:
+  b: bar_b
+  a: foo_a
+  thing: bar_thing
+  c: foobarList_c
+foobar:
+  c: foo_c
+  a: foo_a
+  thing: foobar_thing
+```
+

pkg/yqlib/doc/Assign.md

@@ -5,6 +5,18 @@ 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.
+## Create yaml file
+Running
+```bash
+yq eval --null-input '.a.b = "cat" | .x = "frog"'
+```
+will output
+```yaml
+a:
+  b: cat
+x: frog
+```
+
 ## Update node to be the child value
 Given a sample.yml file of:
 ```yaml
@@ -22,6 +34,27 @@ a:
   g: foof
 ```
 
+## Update node from another file
+Note this will also work when the second file is a scalar (string/number)
+
+Given a sample.yml file of:
+```yaml
+a: apples
+```
+And another sample another.yml file of:
+```yaml
+b: bob
+```
+then
+```bash
+yq eval-all 'select(fileIndex==0).a = select(fileIndex==1) | select(fileIndex==0)' sample.yml another.yml
+```
+will output
+```yaml
+a:
+  b: bob
+```
+
 ## Update node to be the sibling value
 Given a sample.yml file of:
 ```yaml
@@ -100,7 +133,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.[] | select(. == "apple") |= "frog"' sample.yml
+yq eval '(.a[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -118,7 +151,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(. == "*andy") |= "bogs"' sample.yml
+yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -148,7 +181,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.a.b[0] |= "bogs"' sample.yml
+yq eval '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Comment Operators.md

@@ -13,6 +13,22 @@ will output
 a: cat # single
 ```
 
+## Use update assign to perform relative updates
+Given a sample.yml file of:
+```yaml
+a: cat
+b: dog
+```
+then
+```bash
+yq eval '.. lineComment |= .' sample.yml
+```
+will output
+```yaml
+a: cat # cat
+b: dog # dog
+```
+
 ## Set head comment
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Delete.md

@@ -14,6 +14,23 @@ will output
 a: cat
 ```
 
+## Delete nested entry in map
+Given a sample.yml file of:
+```yaml
+a:
+  a1: fred
+  a2: frood
+```
+then
+```bash
+yq eval 'del(.a.a1)' sample.yml
+```
+will output
+```yaml
+a:
+  a2: frood
+```
+
 ## Delete entry in array
 Given a sample.yml file of:
 ```yaml
@@ -31,6 +48,21 @@ will output
 - 3
 ```
 
+## Delete nested entry in array
+Given a sample.yml file of:
+```yaml
+- a: cat
+  b: dog
+```
+then
+```bash
+yq eval 'del(.[0].a)' sample.yml
+```
+will output
+```yaml
+- b: dog
+```
+
 ## Delete no matches
 Given a sample.yml file of:
 ```yaml
@@ -63,3 +95,23 @@ will output
 b: dog
 ```
 
+## Recursively delete matching keys
+Given a sample.yml file of:
+```yaml
+a:
+  name: frog
+  b:
+    name: blog
+    age: 12
+```
+then
+```bash
+yq eval 'del(.. | select(has("name")).name)' sample.yml
+```
+will output
+```yaml
+a:
+  b:
+    age: 12
+```
+

pkg/yqlib/doc/Document Index.md

@@ -17,6 +17,24 @@ will output
 1
 ```
 
+## Retrieve a document index, shorthand
+Given a sample.yml file of:
+```yaml
+a: cat
+---
+a: frog
+```
+then
+```bash
+yq eval '.a | di' sample.yml
+```
+will output
+```yaml
+0
+---
+1
+```
+
 ## Filter by document index
 Given a sample.yml file of:
 ```yaml
@@ -26,7 +44,23 @@ a: frog
 ```
 then
 ```bash
-yq eval 'select(. | documentIndex == 1)' sample.yml
+yq eval 'select(documentIndex == 1)' sample.yml
+```
+will output
+```yaml
+a: frog
+```
+
+## Filter by document index shorthand
+Given a sample.yml file of:
+```yaml
+a: cat
+---
+a: frog
+```
+then
+```bash
+yq eval 'select(di == 1)' sample.yml
 ```
 will output
 ```yaml
@@ -42,7 +76,7 @@ a: frog
 ```
 then
 ```bash
-yq eval '.a | ({"match": ., "doc": (. | documentIndex)})' sample.yml
+yq eval '.a | ({"match": ., "doc": documentIndex})' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Explode.md

@@ -1,98 +0,0 @@
-Explodes (or dereferences) aliases and anchors.
-## Explode alias and anchor
-Given a sample.yml file of:
-```yaml
-f:
-  a: &a cat
-  b: *a
-```
-then
-```bash
-yq eval 'explode(.f)' sample.yml
-```
-will output
-```yaml
-f:
-  a: cat
-  b: cat
-```
-
-## Explode with no aliases or anchors
-Given a sample.yml file of:
-```yaml
-a: mike
-```
-then
-```bash
-yq eval 'explode(.a)' sample.yml
-```
-will output
-```yaml
-a: mike
-```
-
-## Explode with alias keys
-Given a sample.yml file of:
-```yaml
-f:
-  a: &a cat
-  *a: b
-```
-then
-```bash
-yq eval 'explode(.f)' sample.yml
-```
-will output
-```yaml
-f:
-  a: cat
-  cat: b
-```
-
-## Explode with merge anchors
-Given a sample.yml file of:
-```yaml
-foo: &foo
-  a: foo_a
-  thing: foo_thing
-  c: foo_c
-bar: &bar
-  b: bar_b
-  thing: bar_thing
-  c: bar_c
-foobarList:
-  b: foobarList_b
-  !!merge <<:
-    - *foo
-    - *bar
-  c: foobarList_c
-foobar:
-  c: foobar_c
-  !!merge <<: *foo
-  thing: foobar_thing
-```
-then
-```bash
-yq eval 'explode(.)' sample.yml
-```
-will output
-```yaml
-foo:
-  a: foo_a
-  thing: foo_thing
-  c: foo_c
-bar:
-  b: bar_b
-  thing: bar_thing
-  c: bar_c
-foobarList:
-  b: bar_b
-  a: foo_a
-  thing: bar_thing
-  c: foobarList_c
-foobar:
-  c: foo_c
-  a: foo_a
-  thing: foobar_thing
-```
-

pkg/yqlib/doc/File Operators.md

@@ -1,9 +1,11 @@
 File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).
 
+Note that the `fileIndex` operator has a short alias of `fi`.
+
 ## Merging files
 Note the use of eval-all to ensure all documents are loaded into memory.
 ```bash
-yq eval-all 'select(fileIndex == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
+yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```
 ## Get filename
 Given a sample.yml file of:
@@ -16,7 +18,7 @@ yq eval 'filename' sample.yml
 ```
 will output
 ```yaml
-sample.yaml
+sample.yml
 ```
 
 ## Get file index
@@ -33,3 +35,17 @@ will output
 0
 ```
 
+## Get file index alias
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval 'fi' sample.yml
+```
+will output
+```yaml
+0
+```
+

pkg/yqlib/doc/Length.md

@@ -0,0 +1,54 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.
+
+## String length
+returns length of string
+
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a | length' sample.yml
+```
+will output
+```yaml
+3
+```
+
+## Map length
+returns number of entries
+
+Given a sample.yml file of:
+```yaml
+a: cat
+c: dog
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+2
+```
+
+## Array length
+returns number of elements
+
+Given a sample.yml file of:
+```yaml
+- 2
+- 4
+- 6
+- 8
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+4
+```
+

pkg/yqlib/doc/Multiply.md

@@ -2,6 +2,8 @@ Like the multiple operator in `jq`, depending on the operands, this multiply ope
 
 Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).
 
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
 Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
 
 ## Merging files
@@ -109,6 +111,38 @@ b:
   - 5
 ```
 
+## Merge, appending arrays
+Given a sample.yml file of:
+```yaml
+a:
+  array:
+    - 1
+    - 2
+    - animal: dog
+  value: coconut
+b:
+  array:
+    - 3
+    - 4
+    - animal: cat
+  value: banana
+```
+then
+```bash
+yq eval '.a *+ .b' sample.yml
+```
+will output
+```yaml
+array:
+  - 1
+  - 2
+  - animal: dog
+  - 3
+  - 4
+  - animal: cat
+value: banana
+```
+
 ## Merge to prefix an element
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Path.md

@@ -1,4 +1,7 @@
 The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+
+You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.
+
 ## Map path
 Given a sample.yml file of:
 ```yaml
@@ -15,6 +18,21 @@ will output
 - b
 ```
 
+## Get map key
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a.b | path | .[-1]' sample.yml
+```
+will output
+```yaml
+b
+```
+
 ## Array path
 Given a sample.yml file of:
 ```yaml
@@ -32,6 +50,22 @@ will output
 - 1
 ```
 
+## Get array index
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "dog") | path | .[-1]' sample.yml
+```
+will output
+```yaml
+1
+```
+
 ## Print path and value
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Pipe.md

@@ -0,0 +1,35 @@
+Pipe the results of an expression into another. Like the bash operator.
+
+## Simple Pipe
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a | .b' sample.yml
+```
+will output
+```yaml
+cat
+```
+
+## Multiple updates
+Given a sample.yml file of:
+```yaml
+a: cow
+b: sheep
+c: same
+```
+then
+```bash
+yq eval '.a = "cat" | .b = "dog"' sample.yml
+```
+will output
+```yaml
+a: cat
+b: dog
+c: same
+```
+

pkg/yqlib/doc/Recursive Descent.md

@@ -1,8 +1,97 @@
-This operator recursively matches all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches, for instance to set the `style` of all nodes in a yaml doc:
+This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 
+
+## match values form `..`
+This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it to find/manipulate particular values.
+
+For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:
 
 ```bash
 yq eval '.. style= "flow"' file.yaml
 ```
+
+## match values and map keys form `...`
+The also includes map keys in the results set. This is particularly useful in YAML as unlike JSON, map keys can have their own styling, tags and use anchors and aliases.
+
+For instance to set the `style` of all nodes in a yaml doc, including the map keys:
+
+```bash
+yq eval '... style= "flow"' file.yaml
+```
+## Recurse map (values only)
+Given a sample.yml file of:
+```yaml
+a: frog
+```
+then
+```bash
+yq eval '..' sample.yml
+```
+will output
+```yaml
+a: frog
+frog
+```
+
+## Recursively find nodes with keys
+Given a sample.yml file of:
+```yaml
+a:
+  name: frog
+  b:
+    name: blog
+    age: 12
+```
+then
+```bash
+yq eval '.. | select(has("name"))' sample.yml
+```
+will output
+```yaml
+name: frog
+b:
+  name: blog
+  age: 12
+name: blog
+age: 12
+```
+
+## Recursively find nodes with values
+Given a sample.yml file of:
+```yaml
+a:
+  nameA: frog
+  b:
+    nameB: frog
+    age: 12
+```
+then
+```bash
+yq eval '.. | select(. == "frog")' sample.yml
+```
+will output
+```yaml
+frog
+frog
+```
+
+## Recurse map (values and keys)
+Note that the map key appears in the results
+
+Given a sample.yml file of:
+```yaml
+a: frog
+```
+then
+```bash
+yq eval '...' sample.yml
+```
+will output
+```yaml
+a: frog
+a
+frog
+```
+
 ## Aliases are not traversed
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Sort Keys.md

@@ -0,0 +1,68 @@
+The Sort Keys operator sorts maps by their keys (based on their string value). This operator does not do anything to arrays or scalars (so you can easily recursively apply it to all maps).
+
+Sort is particularly useful for diffing two different yaml documents:
+
+```bash
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
+diff file1.yml file2.yml
+```
+
+## Sort keys of map
+Given a sample.yml file of:
+```yaml
+c: frog
+a: blah
+b: bing
+```
+then
+```bash
+yq eval 'sortKeys(.)' sample.yml
+```
+will output
+```yaml
+a: blah
+b: bing
+c: frog
+```
+
+## Sort keys recursively
+Note the array elements are left unsorted, but maps inside arrays are sorted
+
+Given a sample.yml file of:
+```yaml
+bParent:
+  c: dog
+  array:
+    - 3
+    - 1
+    - 2
+aParent:
+  z: donkey
+  x:
+    - c: yum
+      b: delish
+    - b: ew
+      a: apple
+```
+then
+```bash
+yq eval 'sortKeys(..)' sample.yml
+```
+will output
+```yaml
+aParent:
+  x:
+    - b: delish
+      c: yum
+    - a: apple
+      b: ew
+  z: donkey
+bParent:
+  array:
+    - 3
+    - 1
+    - 2
+  c: dog
+```
+

pkg/yqlib/doc/Style.md

@@ -40,6 +40,26 @@ c: "3.2"
 e: "true"
 ```
 
+## Set double quote style on map keys too
+Given a sample.yml file of:
+```yaml
+a: cat
+b: 5
+c: 3.2
+e: true
+```
+then
+```bash
+yq eval '... style="double"' sample.yml
+```
+will output
+```yaml
+"a": "cat"
+"b": "5"
+"c": "3.2"
+"e": "true"
+```
+
 ## Set single quote style
 Given a sample.yml file of:
 ```yaml
@@ -125,19 +145,19 @@ will output
 {a: cat, b: 5, c: 3.2, e: true}
 ```
 
-## Pretty print
-Set empty (default) quote style
+## Reset style - or pretty print
+Set empty (default) quote style, note the usage of `...` to match keys too. Note that there is a `--prettyPrint/-P` short flag for this.
 
 Given a sample.yml file of:
 ```yaml
 a: cat
-b: 5
-c: 3.2
-e: true
+"b": 5
+'c': 3.2
+"e": true
 ```
 then
 ```bash
-yq eval '.. style=""' sample.yml
+yq eval '... style=""' sample.yml
 ```
 will output
 ```yaml
@@ -147,6 +167,22 @@ c: 3.2
 e: true
 ```
 
+## Set style relatively with assign-update
+Given a sample.yml file of:
+```yaml
+a: single
+b: double
+```
+then
+```bash
+yq eval '.[] style |= .' sample.yml
+```
+will output
+```yaml
+a: 'single'
+b: "double"
+```
+
 ## Read style
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/Tag.md

@@ -22,7 +22,21 @@ will output
 !!seq
 ```
 
-## Convert numbers to strings
+## Set custom tag
+Given a sample.yml file of:
+```yaml
+a: str
+```
+then
+```bash
+yq eval '.a tag = "!!mikefarah"' sample.yml
+```
+will output
+```yaml
+a: !!mikefarah str
+```
+
+## Find numbers and convert them to strings
 Given a sample.yml file of:
 ```yaml
 a: cat

pkg/yqlib/doc/Traverse.md

@@ -106,7 +106,7 @@ b: *cat
 ```
 then
 ```bash
-yq eval '.b.[]' sample.yml
+yq eval '.b[]' sample.yml
 ```
 will output
 ```yaml
@@ -138,7 +138,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[0]' sample.yml
+yq eval '.[0]' sample.yml
 ```
 will output
 ```yaml
@@ -152,7 +152,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[2]' sample.yml
+yq eval '.[2]' sample.yml
 ```
 will output
 ```yaml
@@ -166,7 +166,7 @@ a: b
 ```
 then
 ```bash
-yq eval '[0]' sample.yml
+yq eval '.[0]' sample.yml
 ```
 will output
 ```yaml
@@ -290,7 +290,7 @@ foobar:
 ```
 then
 ```bash
-yq eval '.foobar.[]' sample.yml
+yq eval '.foobar[]' sample.yml
 ```
 will output
 ```yaml
@@ -356,7 +356,7 @@ foobar:
 ```
 then
 ```bash
-yq eval '.foobarList.[]' sample.yml
+yq eval '.foobarList[]' sample.yml
 ```
 will output
 ```yaml
@@ -366,3 +366,21 @@ bar_thing
 foobarList_c
 ```
 
+## Select multiple indices
+Given a sample.yml file of:
+```yaml
+a:
+  - a
+  - b
+  - c
+```
+then
+```bash
+yq eval '.a[0, 2]' sample.yml
+```
+will output
+```yaml
+a
+c
+```
+

pkg/yqlib/doc/headers/Add.md

@@ -1,4 +1,6 @@
 Add behaves differently according to the type of the LHS:
 - arrays: concatenate
 - number scalars: arithmetic addition (soon)
-- string scalars: concatenate (soon)
+- string scalars: concatenate (soon)
+
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.a |= . + .x`.

pkg/yqlib/doc/headers/Alternative (Default value).md

@@ -0,0 +1 @@
+This operator is used to provide alternative (or default) values when a particular expression is either null or false.

pkg/yqlib/doc/headers/Anchor and Alias Operators.md

@@ -0,0 +1,4 @@
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference aliases and remove anchor names).
+
+`yq` supports merge aliases (like `<<: *blah`) however this is no longer in the standard yaml spec (1.2) and so `yq` will automatically add the `!!merge` tag to these nodes as it is effectively a custom tag.
+

pkg/yqlib/doc/headers/Explode.md

@@ -1 +0,0 @@
-Explodes (or dereferences) aliases and anchors.

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

@@ -1,7 +1,9 @@
 File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).
 
+Note that the `fileIndex` operator has a short alias of `fi`.
+
 ## Merging files
 Note the use of eval-all to ensure all documents are loaded into memory.
 ```bash
-yq eval-all 'select(fileIndex == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
+yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
 ```

pkg/yqlib/doc/headers/Length.md

@@ -0,0 +1 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.

pkg/yqlib/doc/headers/Multiply.md

@@ -2,6 +2,8 @@ Like the multiple operator in `jq`, depending on the operands, this multiply ope
 
 Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).
 
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
 Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
 
 ## Merging files

pkg/yqlib/doc/headers/Path.md

@@ -1 +1,3 @@
-The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+
+You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.

pkg/yqlib/doc/headers/Pipe.md

@@ -0,0 +1 @@
+Pipe the results of an expression into another. Like the bash operator.

pkg/yqlib/doc/headers/Recursive Descent.md

@@ -1,5 +1,19 @@
-This operator recursively matches all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches, for instance to set the `style` of all nodes in a yaml doc:
+This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 
+
+## match values form `..`
+This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it to find/manipulate particular values.
+
+For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:
 
 ```bash
 yq eval '.. style= "flow"' file.yaml
+```
+
+## match values and map keys form `...`
+The also includes map keys in the results set. This is particularly useful in YAML as unlike JSON, map keys can have their own styling, tags and use anchors and aliases.
+
+For instance to set the `style` of all nodes in a yaml doc, including the map keys:
+
+```bash
+yq eval '... style= "flow"' file.yaml
 ```

pkg/yqlib/doc/headers/Sort Keys.md

@@ -0,0 +1,9 @@
+The Sort Keys operator sorts maps by their keys (based on their string value). This operator does not do anything to arrays or scalars (so you can easily recursively apply it to all maps).
+
+Sort is particularly useful for diffing two different yaml documents:
+
+```bash
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
+diff file1.yml file2.yml
+```

pkg/yqlib/file_utils.go

@@ -0,0 +1,50 @@
+package yqlib
+
+import (
+	"io"
+	"os"
+)
+
+func safelyRenameFile(from string, to string) {
+	if renameError := os.Rename(from, to); renameError != nil {
+		log.Debugf("Error renaming from %v to %v, attempting to copy contents", from, to)
+		log.Debug(renameError.Error())
+		// can't do this rename when running in docker to a file targeted in a mounted volume,
+		// so gracefully degrade to copying the entire contents.
+		if copyError := copyFileContents(from, to); copyError != nil {
+			log.Errorf("Failed copying from %v to %v", from, to)
+			log.Error(copyError.Error())
+		} else {
+			removeErr := os.Remove(from)
+			if removeErr != nil {
+				log.Errorf("failed removing original file: %s", from)
+			}
+		}
+	}
+}
+
+// thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
+func copyFileContents(src, dst string) (err error) {
+	in, err := os.Open(src) // nolint gosec
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(in)
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(out)
+	if _, err = io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}
+
+func safelyCloseFile(file *os.File) {
+	err := file.Close()
+	if err != nil {
+		log.Error("Error closing file!")
+		log.Error(err.Error())
+	}
+}

pkg/yqlib/lib.go

@@ -9,6 +9,8 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
+var log = logging.MustGetLogger("yq-lib")
+
 type OperationType struct {
 	Type       string
 	NumArgs    uint // number of arguments to the op
@@ -17,46 +19,53 @@ type OperationType struct {
 }
 
 // operators TODO:
-// - write in place
-// - mergeAppend (merges and appends arrays)
+// - keys operator for controlling key metadata (particularly anchors/aliases)
 // - mergeEmpty (sets only if the document is empty, do I do that now?)
-// - compare ??
-// - validate ??
-// - exists
 
 var Or = &OperationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: OrOperator}
 var And = &OperationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: AndOperator}
 
 var Union = &OperationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: UnionOperator}
 
+var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: PipeOperator}
+
 var Assign = &OperationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: AssignUpdateOperator}
+var AddAssign = &OperationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: AddAssignOperator}
 
 var AssignAttributes = &OperationType{Type: "ASSIGN_ATTRIBUTES", NumArgs: 2, Precedence: 40, Handler: AssignAttributesOperator}
 var AssignStyle = &OperationType{Type: "ASSIGN_STYLE", NumArgs: 2, Precedence: 40, Handler: AssignStyleOperator}
 var AssignTag = &OperationType{Type: "ASSIGN_TAG", NumArgs: 2, Precedence: 40, Handler: AssignTagOperator}
 var AssignComment = &OperationType{Type: "ASSIGN_COMMENT", NumArgs: 2, Precedence: 40, Handler: AssignCommentsOperator}
+var AssignAnchor = &OperationType{Type: "ASSIGN_ANCHOR", NumArgs: 2, Precedence: 40, Handler: AssignAnchorOperator}
+var AssignAlias = &OperationType{Type: "ASSIGN_ALIAS", NumArgs: 2, Precedence: 40, Handler: AssignAliasOperator}
 
 var Multiply = &OperationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 45, Handler: MultiplyOperator}
 var Add = &OperationType{Type: "ADD", NumArgs: 2, Precedence: 45, Handler: AddOperator}
+var Alternative = &OperationType{Type: "ALTERNATIVE", NumArgs: 2, Precedence: 45, Handler: AlternativeOperator}
 
 var Equals = &OperationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: EqualsOperator}
 var CreateMap = &OperationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 40, Handler: CreateMapOperator}
-var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}
+
+var ShortPipe = &OperationType{Type: "SHORT_PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}
 
 var Length = &OperationType{Type: "LENGTH", NumArgs: 0, Precedence: 50, Handler: LengthOperator}
 var Collect = &OperationType{Type: "COLLECT", NumArgs: 0, Precedence: 50, Handler: CollectOperator}
 var GetStyle = &OperationType{Type: "GET_STYLE", NumArgs: 0, Precedence: 50, Handler: GetStyleOperator}
 var GetTag = &OperationType{Type: "GET_TAG", NumArgs: 0, Precedence: 50, Handler: GetTagOperator}
 var GetComment = &OperationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: GetCommentsOperator}
+var GetAnchor = &OperationType{Type: "GET_ANCHOR", NumArgs: 0, Precedence: 50, Handler: GetAnchorOperator}
+var GetAlias = &OperationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: GetAliasOperator}
 var GetDocumentIndex = &OperationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: GetDocumentIndexOperator}
 var GetFilename = &OperationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: GetFilenameOperator}
 var GetFileIndex = &OperationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: GetFileIndexOperator}
 var GetPath = &OperationType{Type: "GET_PATH", NumArgs: 0, Precedence: 50, Handler: GetPathOperator}
 
 var Explode = &OperationType{Type: "EXPLODE", NumArgs: 1, Precedence: 50, Handler: ExplodeOperator}
+var SortKeys = &OperationType{Type: "SORT_KEYS", NumArgs: 1, Precedence: 50, Handler: SortKeysOperator}
 
 var CollectObject = &OperationType{Type: "COLLECT_OBJECT", NumArgs: 0, Precedence: 50, Handler: CollectObjectOperator}
 var TraversePath = &OperationType{Type: "TRAVERSE_PATH", NumArgs: 0, Precedence: 50, Handler: TraversePathOperator}
+var TraverseArray = &OperationType{Type: "TRAVERSE_ARRAY", NumArgs: 1, Precedence: 50, Handler: TraverseArrayOperator}
 
 var DocumentFilter = &OperationType{Type: "DOCUMENT_FILTER", NumArgs: 0, Precedence: 50, Handler: TraversePathOperator}
 var SelfReference = &OperationType{Type: "SELF", NumArgs: 0, Precedence: 50, Handler: SelfOperator}
@@ -69,9 +78,7 @@ var RecursiveDescent = &OperationType{Type: "RECURSIVE_DESCENT", NumArgs: 0, Pre
 var Select = &OperationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler: SelectOperator}
 var Has = &OperationType{Type: "HAS", NumArgs: 1, Precedence: 50, Handler: HasOperator}
 var DeleteChild = &OperationType{Type: "DELETE", NumArgs: 1, Precedence: 40, Handler: DeleteChildOperator}
-
-// var Exists = &OperationType{Type: "Length", NumArgs: 2, Precedence: 35}
-// filters matches if they have the existing path
+var DeleteImmediateChild = &OperationType{Type: "DELETE_IMMEDIATE_CHILD", NumArgs: 1, Precedence: 40, Handler: DeleteImmediateChildOperator}
 
 type Operation struct {
 	OperationType *OperationType
@@ -79,6 +86,7 @@ type Operation struct {
 	StringValue   string
 	CandidateNode *CandidateNode // used for Value Path elements
 	Preferences   interface{}
+	UpdateAssign  bool // used for assign ops, when true it means we evaluate the rhs given the lhs (instead of matching nodes)
 }
 
 func CreateValueOperation(value interface{}, stringValue string) *Operation {

pkg/yqlib/operator_add.go

@@ -8,13 +8,21 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
-func toNodes(candidates *list.List) []*yaml.Node {
+func createSelfAddOp(rhs *PathTreeNode) *PathTreeNode {
+	return &PathTreeNode{Operation: &Operation{OperationType: Add},
+		Lhs: &PathTreeNode{Operation: &Operation{OperationType: SelfReference}},
+		Rhs: rhs}
+}
 
-	if candidates.Len() == 0 {
-		return []*yaml.Node{}
-	}
-	candidate := candidates.Front().Value.(*CandidateNode)
+func AddAssignOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	assignmentOp := &Operation{OperationType: Assign}
+	assignmentOp.UpdateAssign = true
 
+	assignmentOpNode := &PathTreeNode{Operation: assignmentOp, Lhs: pathNode.Lhs, Rhs: createSelfAddOp(pathNode.Rhs)}
+	return d.GetMatchingNodes(matchingNodes, assignmentOpNode)
+}
+
+func toNodes(candidate *CandidateNode) []*yaml.Node {
 	if candidate.Node.Tag == "!!null" {
 		return []*yaml.Node{}
 	}
@@ -30,40 +38,33 @@ func toNodes(candidates *list.List) []*yaml.Node {
 
 func AddOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("Add operator")
-	var results = list.New()
-	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
-	if err != nil {
-		return nil, err
-	}
-	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
 
-	if err != nil {
-		return nil, err
-	}
-
-	for el := lhs.Front(); el != nil; el = el.Next() {
-		lhsCandidate := el.Value.(*CandidateNode)
-		lhsNode := UnwrapDoc(lhsCandidate.Node)
-
-		var newBlank = &CandidateNode{
-			Path:     lhsCandidate.Path,
-			Document: lhsCandidate.Document,
-			Filename: lhsCandidate.Filename,
-			Node:     &yaml.Node{},
-		}
-
-		switch lhsNode.Kind {
-		case yaml.MappingNode:
-			return nil, fmt.Errorf("Maps not yet supported for addition")
-		case yaml.SequenceNode:
-			newBlank.Node.Kind = yaml.SequenceNode
-			newBlank.Node.Style = lhsNode.Style
-			newBlank.Node.Tag = "!!seq"
-			newBlank.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
-			results.PushBack(newBlank)
-		case yaml.ScalarNode:
-			return nil, fmt.Errorf("Scalars not yet supported for addition")
-		}
-	}
-	return results, nil
+	return crossFunction(d, matchingNodes, pathNode, add)
+}
+
+func add(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	lhs.Node = UnwrapDoc(lhs.Node)
+	rhs.Node = UnwrapDoc(rhs.Node)
+
+	target := &CandidateNode{
+		Path:     lhs.Path,
+		Document: lhs.Document,
+		Filename: lhs.Filename,
+		Node:     &yaml.Node{},
+	}
+	lhsNode := lhs.Node
+
+	switch lhsNode.Kind {
+	case yaml.MappingNode:
+		return nil, fmt.Errorf("Maps not yet supported for addition")
+	case yaml.SequenceNode:
+		target.Node.Kind = yaml.SequenceNode
+		target.Node.Style = lhsNode.Style
+		target.Node.Tag = "!!seq"
+		target.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
+	case yaml.ScalarNode:
+		return nil, fmt.Errorf("Scalars not yet supported for addition")
+	}
+
+	return target, nil
 }

pkg/yqlib/operator_add_test.go

@@ -5,6 +5,14 @@ import (
 )
 
 var addOperatorScenarios = []expressionScenario{
+	{
+		description: "Concatenate and assign arrays",
+		document:    `{a: {val: thing, b: [cat,dog]}}`,
+		expression:  ".a.b += [\"cow\"]",
+		expected: []string{
+			"D0, P[], (doc)::{a: {val: thing, b: [cat, dog, cow]}}\n",
+		},
+	},
 	{
 		description: "Concatenate arrays",
 		document:    `{a: [1,2], b: [3,4]}`,
@@ -13,6 +21,14 @@ var addOperatorScenarios = []expressionScenario{
 			"D0, P[a], (!!seq)::[1, 2, 3, 4]\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		expression: `[1] + ([2], [3])`,
+		expected: []string{
+			"D0, P[], (!!seq)::- 1\n- 2\n",
+			"D0, P[], (!!seq)::- 1\n- 3\n",
+		},
+	},
 	{
 		description: "Concatenate null to array",
 		document:    `{a: [1,2]}`,

pkg/yqlib/operator_alternative.go

@@ -0,0 +1,28 @@
+package yqlib
+
+import (
+	"container/list"
+)
+
+// corssFunction no matches
+// can boolean use crossfunction
+
+func AlternativeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- alternative")
+	return crossFunction(d, matchingNodes, pathNode, alternativeFunc)
+}
+
+func alternativeFunc(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	lhs.Node = UnwrapDoc(lhs.Node)
+	rhs.Node = UnwrapDoc(rhs.Node)
+	log.Debugf("Alternative LHS: %v", lhs.Node.Tag)
+	log.Debugf("-          RHS: %v", rhs.Node.Tag)
+
+	isTrue, err := isTruthy(lhs)
+	if err != nil {
+		return nil, err
+	} else if isTrue {
+		return lhs, nil
+	}
+	return rhs, nil
+}

pkg/yqlib/operator_alternative_test.go

@@ -0,0 +1,62 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var alternativeOperatorScenarios = []expressionScenario{
+	{
+		description: "LHS is defined",
+		expression:  `.a // "hello"`,
+		document:    `{a: bridge}`,
+		expected: []string{
+			"D0, P[a], (!!str)::bridge\n",
+		},
+	},
+	{
+		description: "LHS is not defined",
+		expression:  `.a // "hello"`,
+		document:    `{}`,
+		expected: []string{
+			"D0, P[], (!!str)::hello\n",
+		},
+	},
+	{
+		description: "LHS is null",
+		expression:  `.a // "hello"`,
+		document:    `{a: ~}`,
+		expected: []string{
+			"D0, P[], (!!str)::hello\n",
+		},
+	},
+	{
+		description: "LHS is false",
+		expression:  `.a // "hello"`,
+		document:    `{a: false}`,
+		expected: []string{
+			"D0, P[], (!!str)::hello\n",
+		},
+	},
+	{
+		description: "RHS is an expression",
+		expression:  `.a // .b`,
+		document:    `{a: false, b: cat}`,
+		expected: []string{
+			"D0, P[b], (!!str)::cat\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		expression: `false // true`,
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+}
+
+func TestAlternativeOperatorScenarios(t *testing.T) {
+	for _, tt := range alternativeOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Alternative (Default value)", alternativeOperatorScenarios)
+}

pkg/yqlib/operator_anchors_aliases.go

@@ -3,9 +3,119 @@ package yqlib
 import (
 	"container/list"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
+func AssignAliasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	log.Debugf("AssignAlias operator!")
+
+	aliasName := ""
+	if !pathNode.Operation.UpdateAssign {
+		rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+		if rhs.Front() != nil {
+			aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
+		}
+	}
+
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	for el := lhs.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		log.Debugf("Setting aliasName : %v", candidate.GetKey())
+
+		if pathNode.Operation.UpdateAssign {
+			rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+			if err != nil {
+				return nil, err
+			}
+			if rhs.Front() != nil {
+				aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
+			}
+		}
+
+		candidate.Node.Kind = yaml.AliasNode
+		candidate.Node.Value = aliasName
+	}
+	return matchingNodes, nil
+}
+
+func GetAliasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("GetAlias operator!")
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: candidate.Node.Value, Tag: "!!str"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+	return results, nil
+}
+
+func AssignAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	log.Debugf("AssignAnchor operator!")
+
+	anchorName := ""
+	if !pathNode.Operation.UpdateAssign {
+		rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+
+		if rhs.Front() != nil {
+			anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
+		}
+	}
+
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	for el := lhs.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		log.Debugf("Setting anchorName of : %v", candidate.GetKey())
+
+		if pathNode.Operation.UpdateAssign {
+			rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+			if err != nil {
+				return nil, err
+			}
+
+			if rhs.Front() != nil {
+				anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
+			}
+		}
+
+		candidate.Node.Anchor = anchorName
+	}
+	return matchingNodes, nil
+}
+
+func GetAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("GetAnchor operator!")
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		anchor := candidate.Node.Anchor
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: anchor, Tag: "!!str"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+	return results, nil
+}
+
 func ExplodeOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- ExplodeOperation")
 

pkg/yqlib/operator_anchors_aliases_test.go

@@ -4,7 +4,55 @@ import (
 	"testing"
 )
 
-var explodeTest = []expressionScenario{
+var anchorOperatorScenarios = []expressionScenario{
+	{
+		description: "Get anchor",
+		document:    `a: &billyBob cat`,
+		expression:  `.a | anchor`,
+		expected: []string{
+			"D0, P[a], (!!str)::billyBob\n",
+		},
+	},
+	{
+		description: "Set anchor",
+		document:    `a: cat`,
+		expression:  `.a anchor = "foobar"`,
+		expected: []string{
+			"D0, P[], (doc)::a: &foobar cat\n",
+		},
+	},
+	{
+		description: "Set anchor relatively using assign-update",
+		document:    `a: {b: cat}`,
+		expression:  `.a anchor |= .b`,
+		expected: []string{
+			"D0, P[], (doc)::a: &cat {b: cat}\n",
+		},
+	},
+	{
+		description: "Get alias",
+		document:    `{b: &billyBob meow, a: *billyBob}`,
+		expression:  `.a | alias`,
+		expected: []string{
+			"D0, P[a], (!!str)::billyBob\n",
+		},
+	},
+	{
+		description: "Set alias",
+		document:    `{b: &meow purr, a: cat}`,
+		expression:  `.a alias = "meow"`,
+		expected: []string{
+			"D0, P[], (doc)::{b: &meow purr, a: *meow}\n",
+		},
+	},
+	{
+		description: "Set alias relatively using assign-update",
+		document:    `{b: &meow purr, a: {f: meow}}`,
+		expression:  `.a alias |= .f`,
+		expected: []string{
+			"D0, P[], (doc)::{b: &meow purr, a: *meow}\n",
+		},
+	},
 	{
 		description: "Explode alias and anchor",
 		document:    `{f : {a: &a cat, b: *a}}`,
@@ -82,9 +130,9 @@ foobar:
 	},
 }
 
-func TestExplodeOperatorScenarios(t *testing.T) {
-	for _, tt := range explodeTest {
+func TestAnchorAliaseOperatorScenarios(t *testing.T) {
+	for _, tt := range anchorOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Explode", explodeTest)
+	documentScenarios(t, "Anchor and Alias Operators", anchorOperatorScenarios)
 }

pkg/yqlib/operator_assign.go

@@ -2,26 +2,20 @@ package yqlib
 
 import "container/list"
 
-type AssignOpPreferences struct {
-	UpdateAssign bool
-}
-
 func AssignUpdateOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
 	if err != nil {
 		return nil, err
 	}
-	preferences := pathNode.Operation.Preferences.(*AssignOpPreferences)
-
 	var rhs *list.List
-	if !preferences.UpdateAssign {
+	if !pathNode.Operation.UpdateAssign {
 		rhs, err = d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
 	}
 
 	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 
-		if preferences.UpdateAssign {
+		if pathNode.Operation.UpdateAssign {
 			rhs, err = d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
 		}
 
@@ -33,9 +27,16 @@ func AssignUpdateOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNo
 		first := rhs.Front()
 
 		if first != nil {
-			candidate.UpdateFrom(first.Value.(*CandidateNode))
+			rhsCandidate := first.Value.(*CandidateNode)
+			rhsCandidate.Node = UnwrapDoc(rhsCandidate.Node)
+			candidate.UpdateFrom(rhsCandidate)
 		}
 	}
+	// // if there was nothing given, perhaps we are creating a new yaml doc
+	// if matchingNodes.Len() == 0 {
+	// 	log.Debug("started with nothing, returning LHS, %v", lhs.Len())
+	// 	return lhs, nil
+	// }
 	return matchingNodes, nil
 }
 

pkg/yqlib/operator_assign_test.go

@@ -5,6 +5,13 @@ import (
 )
 
 var assignOperatorScenarios = []expressionScenario{
+	{
+		description: "Create yaml file",
+		expression:  `.a.b = "cat" | .x = "frog"`,
+		expected: []string{
+			"D0, P[], ()::a:\n    b: cat\nx: frog\n",
+		},
+	},
 	{
 		description: "Update node to be the child value",
 		document:    `{a: {b: {g: foof}}}`,
@@ -13,6 +20,16 @@ var assignOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{a: {g: foof}}\n",
 		},
 	},
+	{
+		description:    "Update node from another file",
+		subdescription: "Note this will also work when the second file is a scalar (string/number)",
+		document:       `{a: apples}`,
+		document2:      "{b: bob}",
+		expression:     `select(fileIndex==0).a = select(fileIndex==1) | select(fileIndex==0)`,
+		expected: []string{
+			"D0, P[], (doc)::{a: {b: bob}}\n",
+		},
+	},
 	{
 		description: "Update node to be the sibling value",
 		document:    `{a: {b: child}, b: sibling}`,
@@ -73,7 +90,15 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update selected results",
 		document:    `{a: {b: apple, c: cactus}}`,
-		expression:  `.a.[] | select(. == "apple") |= "frog"`,
+		expression:  `(.a[] | select(. == "apple")) = "frog"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: {b: frog, c: cactus}}\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: {b: apple, c: cactus}}`,
+		expression: `(.a.[] | select(. == "apple")) = "frog"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: frog, c: cactus}}\n",
 		},
@@ -81,7 +106,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update array values",
 		document:    `[candy, apple, sandy]`,
-		expression:  `.[] | select(. == "*andy") |= "bogs"`,
+		expression:  `(.[] | select(. == "*andy")) = "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::[bogs, apple, bogs]\n",
 		},
@@ -99,7 +124,7 @@ var assignOperatorScenarios = []expressionScenario{
 		description:           "Update empty object and array",
 		dontFormatInputForDoc: true,
 		document:              `{}`,
-		expression:            `.a.b[0] |= "bogs"`,
+		expression:            `.a.b.[0] |= "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: [bogs]}}\n",
 		},
@@ -107,7 +132,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		skipDoc:    true,
 		document:   `{}`,
-		expression: `.a.b[1].c |= "bogs"`,
+		expression: `.a.b.[1].c |= "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: [null, {c: bogs}]}}\n",
 		},

pkg/yqlib/operator_booleans.go

@@ -25,74 +25,39 @@ func isTruthy(c *CandidateNode) (bool, error) {
 
 type boolOp func(bool, bool) bool
 
-func performBoolOp(results *list.List, lhs *list.List, rhs *list.List, op boolOp) error {
-	for lhsChild := lhs.Front(); lhsChild != nil; lhsChild = lhsChild.Next() {
-		lhsCandidate := lhsChild.Value.(*CandidateNode)
-		lhsTrue, errDecoding := isTruthy(lhsCandidate)
+func performBoolOp(op boolOp) func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		lhs.Node = UnwrapDoc(lhs.Node)
+		rhs.Node = UnwrapDoc(rhs.Node)
+
+		lhsTrue, errDecoding := isTruthy(lhs)
 		if errDecoding != nil {
-			return errDecoding
+			return nil, errDecoding
 		}
 
-		for rhsChild := rhs.Front(); rhsChild != nil; rhsChild = rhsChild.Next() {
-			rhsCandidate := rhsChild.Value.(*CandidateNode)
-			rhsTrue, errDecoding := isTruthy(rhsCandidate)
-			if errDecoding != nil {
-				return errDecoding
-			}
-			boolResult := createBooleanCandidate(lhsCandidate, op(lhsTrue, rhsTrue))
-			results.PushBack(boolResult)
+		rhsTrue, errDecoding := isTruthy(rhs)
+		if errDecoding != nil {
+			return nil, errDecoding
 		}
+
+		return createBooleanCandidate(lhs, op(lhsTrue, rhsTrue)), nil
 	}
-	return nil
-}
-
-func booleanOp(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode, op boolOp) (*list.List, error) {
-	var results = list.New()
-
-	if matchingNodes.Len() == 0 {
-		lhs, err := d.GetMatchingNodes(list.New(), pathNode.Lhs)
-		if err != nil {
-			return nil, err
-		}
-		rhs, err := d.GetMatchingNodes(list.New(), pathNode.Rhs)
-		if err != nil {
-			return nil, err
-		}
-		return results, performBoolOp(results, lhs, rhs, op)
-	}
-
-	for el := matchingNodes.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		lhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Lhs)
-		if err != nil {
-			return nil, err
-		}
-		rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
-		if err != nil {
-			return nil, err
-		}
-
-		err = performBoolOp(results, lhs, rhs, op)
-		if err != nil {
-			return nil, err
-		}
-
-	}
-	return results, nil
 }
 
 func OrOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- orOp")
-	return booleanOp(d, matchingNodes, pathNode, func(b1 bool, b2 bool) bool {
-		return b1 || b2
-	})
+	return crossFunction(d, matchingNodes, pathNode, performBoolOp(
+		func(b1 bool, b2 bool) bool {
+			return b1 || b2
+		}))
 }
 
 func AndOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- AndOp")
-	return booleanOp(d, matchingNodes, pathNode, func(b1 bool, b2 bool) bool {
-		return b1 && b2
-	})
+	return crossFunction(d, matchingNodes, pathNode, performBoolOp(
+		func(b1 bool, b2 bool) bool {
+			return b1 && b2
+		}))
 }
 
 func NotOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {

pkg/yqlib/operator_collect_object.go

@@ -55,7 +55,7 @@ func CollectObjectOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *
 func createChildCandidate(candidate *CandidateNode, index int) *CandidateNode {
 	return &CandidateNode{
 		Document: candidate.Document,
-		Path:     append(candidate.Path, index),
+		Path:     candidate.CreateChildPath(index),
 		Filename: candidate.Filename,
 		Node:     candidate.Node.Content[index],
 	}
@@ -67,7 +67,9 @@ func collect(d *dataTreeNavigator, aggregate *list.List, remainingMatches *list.
 	}
 
 	candidate := remainingMatches.Remove(remainingMatches.Front()).(*CandidateNode)
-	splatted, err := Splat(d, nodeToMap(candidate))
+
+	splatted, err := Splat(d, nodeToMap(candidate),
+		&TraversePreferences{FollowAlias: false, IncludeMapKeys: false})
 
 	for splatEl := splatted.Front(); splatEl != nil; splatEl = splatEl.Next() {
 		splatEl.Value.(*CandidateNode).Path = nil
@@ -94,7 +96,7 @@ func collect(d *dataTreeNavigator, aggregate *list.List, remainingMatches *list.
 
 			newCandidate.Path = nil
 
-			newCandidate, err = multiply(d, newCandidate, splatCandidate)
+			newCandidate, err = multiply(&MultiplyPreferences{AppendArrays: false})(d, newCandidate, splatCandidate)
 			if err != nil {
 				return nil, err
 			}

pkg/yqlib/operator_collect_object_test.go

@@ -110,5 +110,5 @@ func TestCollectObjectOperatorScenarios(t *testing.T) {
 	for _, tt := range collectObjectOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Collect into Object", collectObjectOperatorScenarios)
+	documentScenarios(t, "Create, Collect into Object", collectObjectOperatorScenarios)
 }

pkg/yqlib/operator_collect_test.go

@@ -13,6 +13,14 @@ var collectOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!seq)::[]\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   ``,
+		expression: `[3]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- 3\n",
+		},
+	},
 	{
 		description: "Collect single",
 		document:    ``,

pkg/yqlib/operator_comments.go

@@ -4,7 +4,7 @@ import (
 	"container/list"
 	"strings"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type CommentOpPreferences struct {
@@ -17,15 +17,6 @@ func AssignCommentsOperator(d *dataTreeNavigator, matchingNodes *list.List, path
 
 	log.Debugf("AssignComments operator!")
 
-	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
-	if err != nil {
-		return nil, err
-	}
-	comment := ""
-	if rhs.Front() != nil {
-		comment = rhs.Front().Value.(*CandidateNode).Node.Value
-	}
-
 	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
 
 	if err != nil {
@@ -34,8 +25,32 @@ func AssignCommentsOperator(d *dataTreeNavigator, matchingNodes *list.List, path
 
 	preferences := pathNode.Operation.Preferences.(*CommentOpPreferences)
 
+	comment := ""
+	if !pathNode.Operation.UpdateAssign {
+		rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+
+		if rhs.Front() != nil {
+			comment = rhs.Front().Value.(*CandidateNode).Node.Value
+		}
+	}
+
 	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
+
+		if pathNode.Operation.UpdateAssign {
+			rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+			if err != nil {
+				return nil, err
+			}
+
+			if rhs.Front() != nil {
+				comment = rhs.Front().Value.(*CandidateNode).Node.Value
+			}
+		}
+
 		log.Debugf("Setting comment of : %v", candidate.GetKey())
 		if preferences.LineComment {
 			candidate.Node.LineComment = comment

pkg/yqlib/operator_comments_test.go

@@ -13,6 +13,39 @@ var commentOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: cat # single\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: dog",
+		expression: `.a lineComment=.b`,
+		expected: []string{
+			"D0, P[], (doc)::a: cat # dog\nb: dog\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\n---\na: dog",
+		expression: `.a lineComment |= documentIndex`,
+		expected: []string{
+			"D0, P[], (doc)::a: cat # 0\n",
+			"D1, P[], (doc)::a: dog # 1\n",
+		},
+	},
+	{
+		description: "Use update assign to perform relative updates",
+		document:    "a: cat\nb: dog",
+		expression:  `.. lineComment |= .`,
+		expected: []string{
+			"D0, P[], (!!map)::a: cat # cat\nb: dog # dog\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: dog",
+		expression: `.. comments |= .`,
+		expected: []string{
+			"D0, P[], (!!map)::a: cat # cat\n# cat\n\n# cat\nb: dog # dog\n# dog\n\n# dog\n",
+		},
+	},
 	{
 		description: "Set head comment",
 		document:    `a: cat`,

pkg/yqlib/operator_delete.go

@@ -2,39 +2,67 @@ package yqlib
 
 import (
 	"container/list"
+	"fmt"
 
 	yaml "gopkg.in/yaml.v3"
 )
 
 func DeleteChildOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	// for each lhs, splat the node,
-	// the intersect it against the rhs expression
-	// recreate the contents using only the intersection result.
 
-	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+	nodesToDelete, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	for el := nodesToDelete.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
-		elMap := list.New()
-		elMap.PushBack(candidate)
-		nodesToDelete, err := d.GetMatchingNodes(elMap, pathNode.Rhs)
-		log.Debug("nodesToDelete:\n%v", NodesToString(nodesToDelete))
-		if err != nil {
-			return nil, err
+
+		deleteImmediateChildOp := &Operation{
+			OperationType: DeleteImmediateChild,
+			Value:         candidate.Path[len(candidate.Path)-1],
 		}
 
-		realNode := UnwrapDoc(candidate.Node)
+		deleteImmediateChildOpNode := &PathTreeNode{
+			Operation: deleteImmediateChildOp,
+			Rhs:       createTraversalTree(candidate.Path[0 : len(candidate.Path)-1]),
+		}
 
-		if realNode.Kind == yaml.SequenceNode {
-			deleteFromArray(candidate, nodesToDelete)
-		} else if realNode.Kind == yaml.MappingNode {
-			deleteFromMap(candidate, nodesToDelete)
-		} else {
-			log.Debug("Cannot delete from node that's not a map or array %v", NodeToString(candidate))
+		_, err := d.GetMatchingNodes(matchingNodes, deleteImmediateChildOpNode)
+		if err != nil {
+			return nil, err
 		}
 	}
 	return matchingNodes, nil
 }
 
-func deleteFromMap(candidate *CandidateNode, nodesToDelete *list.List) {
+func DeleteImmediateChildOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	parents, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	childPath := pathNode.Operation.Value
+
+	log.Debug("childPath to remove %v", childPath)
+
+	for el := parents.Front(); el != nil; el = el.Next() {
+		parent := el.Value.(*CandidateNode)
+		parentNode := UnwrapDoc(parent.Node)
+		if parentNode.Kind == yaml.MappingNode {
+			deleteFromMap(parent, childPath)
+		} else if parentNode.Kind == yaml.SequenceNode {
+			deleteFromArray(parent, childPath)
+		} else {
+			return nil, fmt.Errorf("Cannot delete nodes from parent of tag %v", parentNode.Tag)
+		}
+
+	}
+	return matchingNodes, nil
+}
+
+func deleteFromMap(candidate *CandidateNode, childPath interface{}) {
 	log.Debug("deleteFromMap")
 	node := UnwrapDoc(candidate.Node)
 	contents := node.Content
@@ -47,15 +75,10 @@ func deleteFromMap(candidate *CandidateNode, nodesToDelete *list.List) {
 		childCandidate := &CandidateNode{
 			Node:     value,
 			Document: candidate.Document,
-			Path:     append(candidate.Path, key.Value),
+			Path:     candidate.CreateChildPath(key.Value),
 		}
 
-		shouldDelete := false
-		for el := nodesToDelete.Front(); el != nil && !shouldDelete; el = el.Next() {
-			if el.Value.(*CandidateNode).GetKey() == childCandidate.GetKey() {
-				shouldDelete = true
-			}
-		}
+		shouldDelete := key.Value == childPath
 
 		log.Debugf("shouldDelete %v ? %v", childCandidate.GetKey(), shouldDelete)
 
@@ -66,7 +89,7 @@ func deleteFromMap(candidate *CandidateNode, nodesToDelete *list.List) {
 	node.Content = newContents
 }
 
-func deleteFromArray(candidate *CandidateNode, nodesToDelete *list.List) {
+func deleteFromArray(candidate *CandidateNode, childPath interface{}) {
 	log.Debug("deleteFromArray")
 	node := UnwrapDoc(candidate.Node)
 	contents := node.Content
@@ -75,18 +98,7 @@ func deleteFromArray(candidate *CandidateNode, nodesToDelete *list.List) {
 	for index := 0; index < len(contents); index = index + 1 {
 		value := contents[index]
 
-		childCandidate := &CandidateNode{
-			Node:     value,
-			Document: candidate.Document,
-			Path:     append(candidate.Path, index),
-		}
-
-		shouldDelete := false
-		for el := nodesToDelete.Front(); el != nil && !shouldDelete; el = el.Next() {
-			if el.Value.(*CandidateNode).GetKey() == childCandidate.GetKey() {
-				shouldDelete = true
-			}
-		}
+		shouldDelete := fmt.Sprintf("%v", index) == fmt.Sprintf("%v", childPath)
 
 		if !shouldDelete {
 			newContents = append(newContents, value)

pkg/yqlib/operator_delete_test.go

@@ -13,6 +13,22 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{a: cat}\n",
 		},
 	},
+	{
+		description: "Delete nested entry in map",
+		document:    `{a: {a1: fred, a2: frood}}`,
+		expression:  `del(.a.a1)`,
+		expected: []string{
+			"D0, P[], (doc)::{a: {a2: frood}}\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: {a1: fred, a2: frood}}`,
+		expression: `del(.. | select(.=="frood"))`,
+		expected: []string{
+			"D0, P[], (!!map)::{a: {a1: fred}}\n",
+		},
+	},
 	{
 		description: "Delete entry in array",
 		document:    `[1,2,3]`,
@@ -21,6 +37,14 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::[1, 3]\n",
 		},
 	},
+	{
+		description: "Delete nested entry in array",
+		document:    `[{a: cat, b: dog}]`,
+		expression:  `del(.[0].a)`,
+		expected: []string{
+			"D0, P[], (doc)::[{b: dog}]\n",
+		},
+	},
 	{
 		description: "Delete no matches",
 		document:    `{a: cat, b: dog}`,
@@ -37,6 +61,14 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{b: dog}\n",
 		},
 	},
+	{
+		description: "Recursively delete matching keys",
+		document:    `{a: {name: frog, b: {name: blog, age: 12}}}`,
+		expression:  `del(.. | select(has("name")).name)`,
+		expected: []string{
+			"D0, P[], (!!map)::{a: {b: {age: 12}}}\n",
+		},
+	},
 }
 
 func TestDeleteOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_document_index_test.go

@@ -14,10 +14,27 @@ var documentIndexScenarios = []expressionScenario{
 			"D1, P[a], (!!int)::1\n",
 		},
 	},
+	{
+		description: "Retrieve a document index, shorthand",
+		document:    "a: cat\n---\na: frog\n",
+		expression:  `.a | di`,
+		expected: []string{
+			"D0, P[a], (!!int)::0\n",
+			"D1, P[a], (!!int)::1\n",
+		},
+	},
 	{
 		description: "Filter by document index",
 		document:    "a: cat\n---\na: frog\n",
-		expression:  `select(. | documentIndex == 1)`,
+		expression:  `select(documentIndex == 1)`,
+		expected: []string{
+			"D1, P[], (doc)::a: frog\n",
+		},
+	},
+	{
+		description: "Filter by document index shorthand",
+		document:    "a: cat\n---\na: frog\n",
+		expression:  `select(di == 1)`,
 		expected: []string{
 			"D1, P[], (doc)::a: frog\n",
 		},
@@ -25,7 +42,7 @@ var documentIndexScenarios = []expressionScenario{
 	{
 		description: "Print Document Index with matches",
 		document:    "a: cat\n---\na: frog\n",
-		expression:  `.a | ({"match": ., "doc": (. | documentIndex)})`,
+		expression:  `.a | ({"match": ., "doc": documentIndex})`,
 		expected: []string{
 			"D0, P[], (!!map)::match: cat\ndoc: 0\n",
 			"D0, P[], (!!map)::match: frog\ndoc: 1\n",

pkg/yqlib/operator_file_test.go

@@ -21,6 +21,14 @@ var fileOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!int)::0\n",
 		},
 	},
+	{
+		description: "Get file index alias",
+		document:    `{a: cat}`,
+		expression:  `fi`,
+		expected: []string{
+			"D0, P[], (!!int)::0\n",
+		},
+	},
 }
 
 func TestFileOperatorsScenarios(t *testing.T) {

pkg/yqlib/operator_length.go

@@ -0,0 +1,35 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func LengthOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- lengthOperation")
+	var results = list.New()
+
+	for el := matchMap.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		targetNode := UnwrapDoc(candidate.Node)
+		var length int
+		switch targetNode.Kind {
+		case yaml.ScalarNode:
+			length = len(targetNode.Value)
+		case yaml.MappingNode:
+			length = len(targetNode.Content) / 2
+		case yaml.SequenceNode:
+			length = len(targetNode.Content)
+		default:
+			length = 0
+		}
+
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}

pkg/yqlib/operator_length_test.go

@@ -0,0 +1,42 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var lengthOperatorScenarios = []expressionScenario{
+	{
+		description:    "String length",
+		subdescription: "returns length of string",
+		document:       `{a: cat}`,
+		expression:     `.a | length`,
+		expected: []string{
+			"D0, P[a], (!!int)::3\n",
+		},
+	},
+	{
+		description:    "Map length",
+		subdescription: "returns number of entries",
+		document:       `{a: cat, c: dog}`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::2\n",
+		},
+	},
+	{
+		description:    "Array length",
+		subdescription: "returns number of elements",
+		document:       `[2,4,6,8]`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::4\n",
+		},
+	},
+}
+
+func TestLengthOperatorScenarios(t *testing.T) {
+	for _, tt := range lengthOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Length", lengthOperatorScenarios)
+}

pkg/yqlib/operator_multiply.go

@@ -43,39 +43,51 @@ func crossFunction(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	return results, nil
 }
 
+type MultiplyPreferences struct {
+	AppendArrays bool
+}
+
 func MultiplyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- MultiplyOperator")
-	return crossFunction(d, matchingNodes, pathNode, multiply)
+	return crossFunction(d, matchingNodes, pathNode, multiply(pathNode.Operation.Preferences.(*MultiplyPreferences)))
 }
 
-func multiply(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	lhs.Node = UnwrapDoc(lhs.Node)
-	rhs.Node = UnwrapDoc(rhs.Node)
-	log.Debugf("Multipling LHS: %v", lhs.Node.Tag)
-	log.Debugf("-          RHS: %v", rhs.Node.Tag)
+func multiply(preferences *MultiplyPreferences) func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		lhs.Node = UnwrapDoc(lhs.Node)
+		rhs.Node = UnwrapDoc(rhs.Node)
+		log.Debugf("Multipling LHS: %v", lhs.Node.Tag)
+		log.Debugf("-          RHS: %v", rhs.Node.Tag)
 
-	if lhs.Node.Kind == yaml.MappingNode && rhs.Node.Kind == yaml.MappingNode ||
-		(lhs.Node.Kind == yaml.SequenceNode && rhs.Node.Kind == yaml.SequenceNode) {
+		shouldAppendArrays := preferences.AppendArrays
+
+		if lhs.Node.Kind == yaml.MappingNode && rhs.Node.Kind == yaml.MappingNode ||
+			(lhs.Node.Kind == yaml.SequenceNode && rhs.Node.Kind == yaml.SequenceNode) {
+
+			var newBlank = &CandidateNode{
+				Path:     lhs.Path,
+				Document: lhs.Document,
+				Filename: lhs.Filename,
+				Node:     &yaml.Node{},
+			}
+			var newThing, err = mergeObjects(d, newBlank, lhs, false)
+			if err != nil {
+				return nil, err
+			}
+			return mergeObjects(d, newThing, rhs, shouldAppendArrays)
 
-		var newBlank = &CandidateNode{
-			Path:     lhs.Path,
-			Document: lhs.Document,
-			Filename: lhs.Filename,
-			Node:     &yaml.Node{},
 		}
-		var newThing, err = mergeObjects(d, newBlank, lhs)
-		if err != nil {
-			return nil, err
-		}
-		return mergeObjects(d, newThing, rhs)
-
+		return nil, fmt.Errorf("Cannot multiply %v with %v", lhs.Node.Tag, rhs.Node.Tag)
 	}
-	return nil, fmt.Errorf("Cannot multiply %v with %v", lhs.Node.Tag, rhs.Node.Tag)
 }
 
-func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode, shouldAppendArrays bool) (*CandidateNode, error) {
 	var results = list.New()
-	err := recursiveDecent(d, results, nodeToMap(rhs))
+
+	// shouldn't recurse arrays if appending
+	prefs := &RecursiveDescentPreferences{RecurseArray: !shouldAppendArrays,
+		TraversePreferences: &TraversePreferences{FollowAlias: false}}
+	err := recursiveDecent(d, results, nodeToMap(rhs), prefs)
 	if err != nil {
 		return nil, err
 	}
@@ -86,7 +98,7 @@ func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode)
 	}
 
 	for el := results.Front(); el != nil; el = el.Next() {
-		err := applyAssignment(d, pathIndexToStartFrom, lhs, el.Value.(*CandidateNode))
+		err := applyAssignment(d, pathIndexToStartFrom, lhs, el.Value.(*CandidateNode), shouldAppendArrays)
 		if err != nil {
 			return nil, err
 		}
@@ -94,20 +106,8 @@ func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode)
 	return lhs, nil
 }
 
-func createTraversalTree(path []interface{}) *PathTreeNode {
-	if len(path) == 0 {
-		return &PathTreeNode{Operation: &Operation{OperationType: SelfReference}}
-	} else if len(path) == 1 {
-		return &PathTreeNode{Operation: &Operation{OperationType: TraversePath, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}}
-	}
-	return &PathTreeNode{
-		Operation: &Operation{OperationType: Pipe},
-		Lhs:       createTraversalTree(path[0:1]),
-		Rhs:       createTraversalTree(path[1:])}
+func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode, shouldAppendArrays bool) error {
 
-}
-
-func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode) error {
 	log.Debugf("merge - applyAssignment lhs %v, rhs: %v", NodeToString(lhs), NodeToString(rhs))
 
 	lhsPath := rhs.Path[pathIndexToStartFrom:]
@@ -115,7 +115,9 @@ func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *Candid
 	assignmentOp := &Operation{OperationType: AssignAttributes}
 	if rhs.Node.Kind == yaml.ScalarNode || rhs.Node.Kind == yaml.AliasNode {
 		assignmentOp.OperationType = Assign
-		assignmentOp.Preferences = &AssignOpPreferences{false}
+		assignmentOp.UpdateAssign = false
+	} else if shouldAppendArrays && rhs.Node.Kind == yaml.SequenceNode {
+		assignmentOp.OperationType = AddAssign
 	}
 	rhsOp := &Operation{OperationType: ValueOp, CandidateNode: rhs}
 

pkg/yqlib/operator_multiply_test.go

@@ -13,6 +13,13 @@ var multiplyOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!map)::{a: {also: me}, b: {also: me}}\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		expression: `{} * {"cat":"dog"}`,
+		expected: []string{
+			"D0, P[], (!!map)::cat: dog\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{a: {also: me}, b: {also: [1]}}`,
@@ -92,6 +99,22 @@ b:
 			"D0, P[], (!!map)::{a: [3, 4, 5], b: [3, 4, 5]}\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: [1], b: [2]}`,
+		expression: `.a *+ .b`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2]\n",
+		},
+	},
+	{
+		description: "Merge, appending arrays",
+		document:    `{a: {array: [1, 2, animal: dog], value: coconut}, b: {array: [3, 4, animal: cat], value: banana}}`,
+		expression:  `.a *+ .b`,
+		expected: []string{
+			"D0, P[a], (!!map)::{array: [1, 2, {animal: dog}, 3, 4, {animal: cat}], value: banana}\n",
+		},
+	},
 	{
 		description: "Merge to prefix an element",
 		document:    `{a: cat, b: dog}`,

pkg/yqlib/operator_path_test.go

@@ -13,6 +13,31 @@ var pathOperatorScenarios = []expressionScenario{
 			"D0, P[a b], (!!seq)::- a\n- b\n",
 		},
 	},
+	{
+		skipDoc: true,
+		document: `a:
+  b:
+    c:
+    - 0
+    - 1
+    - 2
+    - 3`,
+		expression: `.a.b.c.[]`,
+		expected: []string{
+			"D0, P[a b c 0], (!!int)::0\n",
+			"D0, P[a b c 1], (!!int)::1\n",
+			"D0, P[a b c 2], (!!int)::2\n",
+			"D0, P[a b c 3], (!!int)::3\n",
+		},
+	},
+	{
+		description: "Get map key",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a.b | path | .[-1]`,
+		expected: []string{
+			"D0, P[a b -1], (!!str)::b\n",
+		},
+	},
 	{
 		description: "Array path",
 		document:    `{a: [cat, dog]}`,
@@ -21,6 +46,14 @@ var pathOperatorScenarios = []expressionScenario{
 			"D0, P[a 1], (!!seq)::- a\n- 1\n",
 		},
 	},
+	{
+		description: "Get array index",
+		document:    `{a: [cat, dog]}`,
+		expression:  `.a.[] | select(. == "dog") | path | .[-1]`,
+		expected: []string{
+			"D0, P[a 1 -1], (!!int)::1\n",
+		},
+	},
 	{
 		description: "Print path and value",
 		document:    `{a: [cat, dog, frog]}`,

pkg/yqlib/operator_pipe.go

@@ -0,0 +1,11 @@
+package yqlib
+
+import "container/list"
+
+func PipeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+	if err != nil {
+		return nil, err
+	}
+	return d.GetMatchingNodes(lhs, pathNode.Rhs)
+}

pkg/yqlib/operator_pipe_test.go

@@ -0,0 +1,31 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var pipeOperatorScenarios = []expressionScenario{
+	{
+		description: "Simple Pipe",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a | .b`,
+		expected: []string{
+			"D0, P[a b], (!!str)::cat\n",
+		},
+	},
+	{
+		description: "Multiple updates",
+		document:    `{a: cow, b: sheep, c: same}`,
+		expression:  `.a = "cat" | .b = "dog"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: cat, b: dog, c: same}\n",
+		},
+	},
+}
+
+func TestPipeOperatorScenarios(t *testing.T) {
+	for _, tt := range pipeOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Pipe", pipeOperatorScenarios)
+}

pkg/yqlib/operator_recursive_descent.go

@@ -3,13 +3,19 @@ package yqlib
 import (
 	"container/list"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
+type RecursiveDescentPreferences struct {
+	TraversePreferences *TraversePreferences
+	RecurseArray        bool
+}
+
 func RecursiveDescentOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	var results = list.New()
 
-	err := recursiveDecent(d, results, matchMap)
+	preferences := pathNode.Operation.Preferences.(*RecursiveDescentPreferences)
+	err := recursiveDecent(d, results, matchMap, preferences)
 	if err != nil {
 		return nil, err
 	}
@@ -17,7 +23,7 @@ func RecursiveDescentOperator(d *dataTreeNavigator, matchMap *list.List, pathNod
 	return results, nil
 }
 
-func recursiveDecent(d *dataTreeNavigator, results *list.List, matchMap *list.List) error {
+func recursiveDecent(d *dataTreeNavigator, results *list.List, matchMap *list.List, preferences *RecursiveDescentPreferences) error {
 	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 
@@ -26,14 +32,15 @@ func recursiveDecent(d *dataTreeNavigator, results *list.List, matchMap *list.Li
 		log.Debugf("Recursive Decent, added %v", NodeToString(candidate))
 		results.PushBack(candidate)
 
-		if candidate.Node.Kind != yaml.AliasNode {
+		if candidate.Node.Kind != yaml.AliasNode && len(candidate.Node.Content) > 0 &&
+			(preferences.RecurseArray || candidate.Node.Kind != yaml.SequenceNode) {
 
-			children, err := Splat(d, nodeToMap(candidate))
+			children, err := Splat(d, nodeToMap(candidate), preferences.TraversePreferences)
 
 			if err != nil {
 				return err
 			}
-			err = recursiveDecent(d, results, children)
+			err = recursiveDecent(d, results, children, preferences)
 			if err != nil {
 				return err
 			}

pkg/yqlib/operator_recursive_descent_test.go

@@ -5,6 +5,38 @@ import (
 )
 
 var recursiveDescentOperatorScenarios = []expressionScenario{
+	{
+		skipDoc:    true,
+		document:   `{}`,
+		expression: `..`,
+		expected: []string{
+			"D0, P[], (!!map)::{}\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{}`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!map)::{}\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[]`,
+		expression: `..`,
+		expected: []string{
+			"D0, P[], (!!seq)::[]\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[]`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!seq)::[]\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `cat`,
@@ -15,13 +47,50 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 	},
 	{
 		skipDoc:    true,
-		document:   `{a: frog}`,
-		expression: `..`,
+		document:   `cat`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!str)::cat\n",
+		},
+	},
+	{
+		description: "Recurse map (values only)",
+		document:    `{a: frog}`,
+		expression:  `..`,
 		expected: []string{
 			"D0, P[], (!!map)::{a: frog}\n",
 			"D0, P[a], (!!str)::frog\n",
 		},
 	},
+	{
+		description: "Recursively find nodes with keys",
+		document:    `{a: {name: frog, b: {name: blog, age: 12}}}`,
+		expression:  `.. | select(has("name"))`,
+		expected: []string{
+			"D0, P[a], (!!map)::{name: frog, b: {name: blog, age: 12}}\n",
+			"D0, P[a b], (!!map)::{name: blog, age: 12}\n",
+		},
+	},
+	{
+		description: "Recursively find nodes with values",
+		document:    `{a: {nameA: frog, b: {nameB: frog, age: 12}}}`,
+		expression:  `.. | select(. == "frog")`,
+		expected: []string{
+			"D0, P[a nameA], (!!str)::frog\n",
+			"D0, P[a b nameB], (!!str)::frog\n",
+		},
+	},
+	{
+		description:    "Recurse map (values and keys)",
+		subdescription: "Note that the map key appears in the results",
+		document:       `{a: frog}`,
+		expression:     `...`,
+		expected: []string{
+			"D0, P[], (!!map)::{a: frog}\n",
+			"D0, P[a], (!!str)::a\n",
+			"D0, P[a], (!!str)::frog\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{a: {b: apple}}`,
@@ -32,6 +101,18 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[a b], (!!str)::apple\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: {b: apple}}`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!map)::{a: {b: apple}}\n",
+			"D0, P[a], (!!str)::a\n",
+			"D0, P[a], (!!map)::{b: apple}\n",
+			"D0, P[a b], (!!str)::b\n",
+			"D0, P[a b], (!!str)::apple\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `[1,2,3]`,
@@ -43,6 +124,17 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[2], (!!int)::3\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `[1,2,3]`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!seq)::[1, 2, 3]\n",
+			"D0, P[0], (!!int)::1\n",
+			"D0, P[1], (!!int)::2\n",
+			"D0, P[2], (!!int)::3\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `[{a: cat},2,true]`,
@@ -55,6 +147,19 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[2], (!!bool)::true\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `[{a: cat},2,true]`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!seq)::[{a: cat}, 2, true]\n",
+			"D0, P[0], (!!map)::{a: cat}\n",
+			"D0, P[0 a], (!!str)::a\n",
+			"D0, P[0 a], (!!str)::cat\n",
+			"D0, P[1], (!!int)::2\n",
+			"D0, P[2], (!!bool)::true\n",
+		},
+	},
 	{
 		description: "Aliases are not traversed",
 		document:    `{a: &cat {c: frog}, b: *cat}`,
@@ -63,6 +168,20 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[a], (!!seq)::- {a: &cat {c: frog}, b: *cat}\n- &cat {c: frog}\n- frog\n- *cat\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: &cat {c: frog}, b: *cat}`,
+		expression: `...`,
+		expected: []string{
+			"D0, P[], (!!map)::{a: &cat {c: frog}, b: *cat}\n",
+			"D0, P[a], (!!str)::a\n",
+			"D0, P[a], (!!map)::&cat {c: frog}\n",
+			"D0, P[a c], (!!str)::c\n",
+			"D0, P[a c], (!!str)::frog\n",
+			"D0, P[b], (!!str)::b\n",
+			"D0, P[b], (alias)::*cat\n",
+		},
+	},
 	{
 		description: "Merge docs are not traversed",
 		document:    mergeDocSample,
@@ -71,6 +190,14 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[foobar], (!!seq)::- c: foobar_c\n  !!merge <<: *foo\n  thing: foobar_thing\n- foobar_c\n- *foo\n- foobar_thing\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   mergeDocSample,
+		expression: `.foobar | [...]`,
+		expected: []string{
+			"D0, P[foobar], (!!seq)::- c: foobar_c\n  !!merge <<: *foo\n  thing: foobar_thing\n- c\n- foobar_c\n- !!merge <<\n- *foo\n- thing\n- foobar_thing\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   mergeDocSample,
@@ -84,6 +211,22 @@ var recursiveDescentOperatorScenarios = []expressionScenario{
 			"D0, P[foobarList c], (!!str)::foobarList_c\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   mergeDocSample,
+		expression: `.foobarList | ...`,
+		expected: []string{
+			"D0, P[foobarList], (!!map)::b: foobarList_b\n!!merge <<: [*foo, *bar]\nc: foobarList_c\n",
+			"D0, P[foobarList b], (!!str)::b\n",
+			"D0, P[foobarList b], (!!str)::foobarList_b\n",
+			"D0, P[foobarList <<], (!!merge)::!!merge <<\n",
+			"D0, P[foobarList <<], (!!seq)::[*foo, *bar]\n",
+			"D0, P[foobarList << 0], (alias)::*foo\n",
+			"D0, P[foobarList << 1], (alias)::*bar\n",
+			"D0, P[foobarList c], (!!str)::c\n",
+			"D0, P[foobarList c], (!!str)::foobarList_c\n",
+		},
+	},
 }
 
 func TestRecursiveDescentOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_sort_keys.go

@@ -0,0 +1,53 @@
+package yqlib
+
+import (
+	"container/list"
+	"sort"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func SortKeysOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+
+		for childEl := rhs.Front(); childEl != nil; childEl = childEl.Next() {
+			node := UnwrapDoc(childEl.Value.(*CandidateNode).Node)
+			if node.Kind == yaml.MappingNode {
+				sortKeys(node)
+			}
+			if err != nil {
+				return nil, err
+			}
+		}
+
+	}
+	return matchingNodes, nil
+}
+
+func sortKeys(node *yaml.Node) {
+	keys := make([]string, len(node.Content)/2)
+	keyBucket := map[string]*yaml.Node{}
+	valueBucket := map[string]*yaml.Node{}
+	var contents = node.Content
+	for index := 0; index < len(contents); index = index + 2 {
+		key := contents[index]
+		value := contents[index+1]
+		keys[index/2] = key.Value
+		keyBucket[key.Value] = key
+		valueBucket[key.Value] = value
+	}
+	sort.Strings(keys)
+	sortedContent := make([]*yaml.Node, len(node.Content))
+	for index := 0; index < len(keys); index = index + 1 {
+		keyString := keys[index]
+		sortedContent[index*2] = keyBucket[keyString]
+		sortedContent[1+(index*2)] = valueBucket[keyString]
+	}
+	node.Content = sortedContent
+}

pkg/yqlib/operator_sort_keys_test.go

@@ -0,0 +1,32 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var sortKeysOperatorScenarios = []expressionScenario{
+	{
+		description: "Sort keys of map",
+		document:    `{c: frog, a: blah, b: bing}`,
+		expression:  `sortKeys(.)`,
+		expected: []string{
+			"D0, P[], (doc)::{a: blah, b: bing, c: frog}\n",
+		},
+	},
+	{
+		description:    "Sort keys recursively",
+		subdescription: "Note the array elements are left unsorted, but maps inside arrays are sorted",
+		document:       `{bParent: {c: dog, array: [3,1,2]}, aParent: {z: donkey, x: [{c: yum, b: delish}, {b: ew, a: apple}]}}`,
+		expression:     `sortKeys(..)`,
+		expected: []string{
+			"D0, P[], (!!map)::{aParent: {x: [{b: delish, c: yum}, {a: apple, b: ew}], z: donkey}, bParent: {array: [3, 1, 2], c: dog}}\n",
+		},
+	},
+}
+
+func TestSortKeysOperatorScenarios(t *testing.T) {
+	for _, tt := range sortKeysOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Sort Keys", sortKeysOperatorScenarios)
+}

pkg/yqlib/operator_style.go

@@ -4,39 +4,46 @@ import (
 	"container/list"
 	"fmt"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
+func parseStyle(customStyle string) (yaml.Style, error) {
+	if customStyle == "tagged" {
+		return yaml.TaggedStyle, nil
+	} else if customStyle == "double" {
+		return yaml.DoubleQuotedStyle, nil
+	} else if customStyle == "single" {
+		return yaml.SingleQuotedStyle, nil
+	} else if customStyle == "literal" {
+		return yaml.LiteralStyle, nil
+	} else if customStyle == "folded" {
+		return yaml.FoldedStyle, nil
+	} else if customStyle == "flow" {
+		return yaml.FlowStyle, nil
+	} else if customStyle != "" {
+		return 0, fmt.Errorf("Unknown style %v", customStyle)
+	}
+	return 0, nil
+}
+
 func AssignStyleOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 
 	log.Debugf("AssignStyleOperator: %v")
-
-	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
-	if err != nil {
-		return nil, err
-	}
-	customStyle := ""
-
-	if rhs.Front() != nil {
-		customStyle = rhs.Front().Value.(*CandidateNode).Node.Value
-	}
-
 	var style yaml.Style
-	if customStyle == "tagged" {
-		style = yaml.TaggedStyle
-	} else if customStyle == "double" {
-		style = yaml.DoubleQuotedStyle
-	} else if customStyle == "single" {
-		style = yaml.SingleQuotedStyle
-	} else if customStyle == "literal" {
-		style = yaml.LiteralStyle
-	} else if customStyle == "folded" {
-		style = yaml.FoldedStyle
-	} else if customStyle == "flow" {
-		style = yaml.FlowStyle
-	} else if customStyle != "" {
-		return nil, fmt.Errorf("Unknown style %v", customStyle)
+	if !pathNode.Operation.UpdateAssign {
+		rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+
+		if rhs.Front() != nil {
+			style, err = parseStyle(rhs.Front().Value.(*CandidateNode).Node.Value)
+			if err != nil {
+				return nil, err
+			}
+		}
 	}
+
 	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
 
 	if err != nil {
@@ -46,6 +53,20 @@ func AssignStyleOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNod
 	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debugf("Setting style of : %v", candidate.GetKey())
+		if pathNode.Operation.UpdateAssign {
+			rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+			if err != nil {
+				return nil, err
+			}
+
+			if rhs.Front() != nil {
+				style, err = parseStyle(rhs.Front().Value.(*CandidateNode).Node.Value)
+				if err != nil {
+					return nil, err
+				}
+			}
+		}
+
 		candidate.Node.Style = style
 	}
 

pkg/yqlib/operator_style_test.go

@@ -21,6 +21,22 @@ var styleOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!map)::a: \"cat\"\nb: \"5\"\nc: \"3.2\"\ne: \"true\"\n",
 		},
 	},
+	{
+		description: "Set double quote style on map keys too",
+		document:    `{a: cat, b: 5, c: 3.2, e: true}`,
+		expression:  `... style="double"`,
+		expected: []string{
+			"D0, P[], (!!map)::\"a\": \"cat\"\n\"b\": \"5\"\n\"c\": \"3.2\"\n\"e\": \"true\"\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "bing: &foo frog\na:\n  c: cat\n  <<: [*foo]",
+		expression: `(... | select(tag=="!!str")) style="single"`,
+		expected: []string{
+			"D0, P[], (!!map)::'bing': &foo 'frog'\n'a':\n    'c': 'cat'\n    !!merge <<: [*foo]\n",
+		},
+	},
 	{
 		description: "Set single quote style",
 		document:    `{a: cat, b: 5, c: 3.2, e: true}`,
@@ -70,14 +86,22 @@ e: >-
 		},
 	},
 	{
-		description:    "Pretty print",
-		subdescription: "Set empty (default) quote style",
-		document:       `{a: cat, b: 5, c: 3.2, e: true}`,
-		expression:     `.. style=""`,
+		description:    "Reset style - or pretty print",
+		subdescription: "Set empty (default) quote style, note the usage of `...` to match keys too. Note that there is a `--prettyPrint/-P` short flag for this.",
+		document:       `{a: cat, "b": 5, 'c': 3.2, "e": true}`,
+		expression:     `... style=""`,
 		expected: []string{
 			"D0, P[], (!!map)::a: cat\nb: 5\nc: 3.2\ne: true\n",
 		},
 	},
+	{
+		description: "Set style relatively with assign-update",
+		document:    `{a: single, b: double}`,
+		expression:  `.[] style |= .`,
+		expected: []string{
+			"D0, P[], (doc)::{a: 'single', b: \"double\"}\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{a: cat, b: double}`,

pkg/yqlib/operator_tag.go

@@ -3,21 +3,23 @@ package yqlib
 import (
 	"container/list"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
 func AssignTagOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 
 	log.Debugf("AssignTagOperator: %v")
-
-	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
-	if err != nil {
-		return nil, err
-	}
 	tag := ""
 
-	if rhs.Front() != nil {
-		tag = rhs.Front().Value.(*CandidateNode).Node.Value
+	if !pathNode.Operation.UpdateAssign {
+		rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+
+		if rhs.Front() != nil {
+			tag = rhs.Front().Value.(*CandidateNode).Node.Value
+		}
 	}
 
 	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
@@ -29,6 +31,16 @@ func AssignTagOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode
 	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debugf("Setting tag of : %v", candidate.GetKey())
+		if pathNode.Operation.UpdateAssign {
+			rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+			if err != nil {
+				return nil, err
+			}
+
+			if rhs.Front() != nil {
+				tag = rhs.Front().Value.(*CandidateNode).Node.Value
+			}
+		}
 		candidate.Node.Tag = tag
 	}
 
@@ -42,7 +54,7 @@ func GetTagOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pa
 
 	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
-		node := &yaml.Node{Kind: yaml.ScalarNode, Value: candidate.Node.Tag, Tag: "!!str"}
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: UnwrapDoc(candidate.Node).Tag, Tag: "!!str"}
 		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
 		results.PushBack(lengthCand)
 	}

pkg/yqlib/operator_tag_test.go

@@ -19,13 +19,37 @@ var tagOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		description: "Convert numbers to strings",
+		skipDoc:    true,
+		document:   `{a: cat, b: 5, c: 3.2, e: true, f: []}`,
+		expression: `tag`,
+		expected: []string{
+			"D0, P[], (!!str)::'!!map'\n",
+		},
+	},
+	{
+		description: "Set custom tag",
+		document:    `{a: str}`,
+		expression:  `.a tag = "!!mikefarah"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: !!mikefarah str}\n",
+		},
+	},
+	{
+		description: "Find numbers and convert them to strings",
 		document:    `{a: cat, b: 5, c: 3.2, e: true}`,
 		expression:  `(.. | select(tag == "!!int")) tag= "!!str"`,
 		expected: []string{
 			"D0, P[], (!!map)::{a: cat, b: \"5\", c: 3.2, e: true}\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: "!!frog", b: "!!customTag"}`,
+		expression: `.[] tag |= .`,
+		expected: []string{
+			"D0, P[], (doc)::{a: !!frog \"!!frog\", b: !!customTag \"!!customTag\"}\n",
+		},
+	},
 }
 
 func TestTagOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_traverse_path.go

@@ -1,46 +1,39 @@
 package yqlib
 
 import (
-	"fmt"
-
 	"container/list"
+	"fmt"
+	"strconv"
 
 	"github.com/elliotchance/orderedmap"
-
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type TraversePreferences struct {
-	DontFollowAlias bool
+	FollowAlias    bool
+	IncludeMapKeys bool
 }
 
-func Splat(d *dataTreeNavigator, matches *list.List) (*list.List, error) {
-	preferences := &TraversePreferences{DontFollowAlias: true}
-	splatOperation := &Operation{OperationType: TraversePath, Value: "[]", Preferences: preferences}
-	splatTreeNode := &PathTreeNode{Operation: splatOperation}
-	return TraversePathOperator(d, matches, splatTreeNode)
+func Splat(d *dataTreeNavigator, matches *list.List, prefs *TraversePreferences) (*list.List, error) {
+	return traverseNodesWithArrayIndices(matches, make([]*yaml.Node, 0), prefs)
 }
 
 func TraversePathOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- Traversing")
 	var matchingNodeMap = list.New()
-	var newNodes []*CandidateNode
-	var err error
 
 	for el := matchMap.Front(); el != nil; el = el.Next() {
-		newNodes, err = traverse(d, el.Value.(*CandidateNode), pathNode.Operation)
+		newNodes, err := traverse(d, el.Value.(*CandidateNode), pathNode.Operation)
 		if err != nil {
 			return nil, err
 		}
-		for _, n := range newNodes {
-			matchingNodeMap.PushBack(n)
-		}
+		matchingNodeMap.PushBackList(newNodes)
 	}
 
 	return matchingNodeMap, nil
 }
 
-func traverse(d *dataTreeNavigator, matchingNode *CandidateNode, operation *Operation) ([]*CandidateNode, error) {
+func traverse(d *dataTreeNavigator, matchingNode *CandidateNode, operation *Operation) (*list.List, error) {
 	log.Debug("Traversing %v", NodeToString(matchingNode))
 	value := matchingNode.Node
 
@@ -61,34 +54,8 @@ func traverse(d *dataTreeNavigator, matchingNode *CandidateNode, operation *Oper
 	switch value.Kind {
 	case yaml.MappingNode:
 		log.Debug("its a map with %v entries", len(value.Content)/2)
-		var newMatches = orderedmap.NewOrderedMap()
-		err := traverseMap(newMatches, matchingNode, operation)
-
-		if err != nil {
-			return nil, err
-		}
-
-		if newMatches.Len() == 0 {
-			//no matches, create one automagically
-			valueNode := &yaml.Node{Tag: "!!null", Kind: yaml.ScalarNode, Value: "null"}
-			node := matchingNode.Node
-			node.Content = append(node.Content, &yaml.Node{Kind: yaml.ScalarNode, Value: operation.StringValue}, valueNode)
-			candidateNode := &CandidateNode{
-				Node:     valueNode,
-				Path:     append(matchingNode.Path, operation.StringValue),
-				Document: matchingNode.Document,
-			}
-			newMatches.Set(candidateNode.GetKey(), candidateNode)
-
-		}
-
-		arrayMatches := make([]*CandidateNode, newMatches.Len())
-		i := 0
-		for el := newMatches.Front(); el != nil; el = el.Next() {
-			arrayMatches[i] = el.Value.(*CandidateNode)
-			i++
-		}
-		return arrayMatches, nil
+		prefs := &TraversePreferences{FollowAlias: true}
+		return traverseMap(matchingNode, operation.StringValue, prefs, false)
 
 	case yaml.SequenceNode:
 		log.Debug("its a sequence of %v things!", len(value.Content))
@@ -101,105 +68,118 @@ func traverse(d *dataTreeNavigator, matchingNode *CandidateNode, operation *Oper
 	case yaml.DocumentNode:
 		log.Debug("digging into doc node")
 		return traverse(d, &CandidateNode{
-			Node:     matchingNode.Node.Content[0],
-			Document: matchingNode.Document}, operation)
+			Node:      matchingNode.Node.Content[0],
+			Filename:  matchingNode.Filename,
+			FileIndex: matchingNode.FileIndex,
+			Document:  matchingNode.Document}, operation)
 	default:
-		return nil, nil
+		return list.New(), nil
 	}
 }
 
-func keyMatches(key *yaml.Node, pathNode *Operation) bool {
-	return pathNode.Value == "[]" || Match(key.Value, pathNode.StringValue)
-}
+func TraverseArrayOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	// rhs is a collect expression that will yield indexes to retreive of the arrays
 
-func traverseMap(newMatches *orderedmap.OrderedMap, candidate *CandidateNode, operation *Operation) error {
-	// value.Content is a concatenated array of key, value,
-	// so keys are in the even indexes, values in odd.
-	// merge aliases are defined first, but we only want to traverse them
-	// if we don't find a match directly on this node first.
-	//TODO ALIASES, auto creation?
-
-	node := candidate.Node
-
-	followAlias := true
-
-	if operation.Preferences != nil {
-		followAlias = !operation.Preferences.(*TraversePreferences).DontFollowAlias
+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+	if err != nil {
+		return nil, err
 	}
 
-	var contents = node.Content
-	for index := 0; index < len(contents); index = index + 2 {
-		key := contents[index]
-		value := contents[index+1]
+	var indicesToTraverse = rhs.Front().Value.(*CandidateNode).Node.Content
+	prefs := &TraversePreferences{FollowAlias: true}
+	return traverseNodesWithArrayIndices(matchingNodes, indicesToTraverse, prefs)
+}
 
-		log.Debug("checking %v (%v)", key.Value, key.Tag)
-		//skip the 'merge' tag, find a direct match first
-		if key.Tag == "!!merge" && followAlias {
-			log.Debug("Merge anchor")
-			err := traverseMergeAnchor(newMatches, candidate, value, operation)
-			if err != nil {
-				return err
-			}
-		} else if keyMatches(key, operation) {
-			log.Debug("MATCHED")
-			candidateNode := &CandidateNode{
-				Node:     value,
-				Path:     append(candidate.Path, key.Value),
-				Document: candidate.Document,
-			}
-			newMatches.Set(candidateNode.GetKey(), candidateNode)
+func traverseNodesWithArrayIndices(matchingNodes *list.List, indicesToTraverse []*yaml.Node, prefs *TraversePreferences) (*list.List, error) {
+	var matchingNodeMap = list.New()
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		newNodes, err := traverseArrayIndices(candidate, indicesToTraverse, prefs)
+		if err != nil {
+			return nil, err
 		}
+		matchingNodeMap.PushBackList(newNodes)
 	}
 
-	return nil
+	return matchingNodeMap, nil
 }
 
-func traverseMergeAnchor(newMatches *orderedmap.OrderedMap, originalCandidate *CandidateNode, value *yaml.Node, operation *Operation) error {
-	switch value.Kind {
-	case yaml.AliasNode:
-		candidateNode := &CandidateNode{
-			Node:     value.Alias,
-			Path:     originalCandidate.Path,
-			Document: originalCandidate.Document,
-		}
-		return traverseMap(newMatches, candidateNode, operation)
-	case yaml.SequenceNode:
-		for _, childValue := range value.Content {
-			err := traverseMergeAnchor(newMatches, originalCandidate, childValue, operation)
-			if err != nil {
-				return err
-			}
-		}
+func traverseArrayIndices(matchingNode *CandidateNode, indicesToTraverse []*yaml.Node, prefs *TraversePreferences) (*list.List, error) { // call this if doc / alias like the other traverse
+	node := matchingNode.Node
+	if node.Tag == "!!null" {
+		log.Debugf("OperatorArrayTraverse got a null - turning it into an empty array")
+		// auto vivification, make it into an empty array
+		node.Tag = ""
+		node.Kind = yaml.SequenceNode
 	}
-	return nil
+
+	if node.Kind == yaml.AliasNode {
+		matchingNode.Node = node.Alias
+		return traverseArrayIndices(matchingNode, indicesToTraverse, prefs)
+	} else if node.Kind == yaml.SequenceNode {
+		return traverseArrayWithIndices(matchingNode, indicesToTraverse)
+	} else if node.Kind == yaml.MappingNode {
+		return traverseMapWithIndices(matchingNode, indicesToTraverse, prefs)
+	} else if node.Kind == yaml.DocumentNode {
+		return traverseArrayIndices(&CandidateNode{
+			Node:      matchingNode.Node.Content[0],
+			Filename:  matchingNode.Filename,
+			FileIndex: matchingNode.FileIndex,
+			Document:  matchingNode.Document}, indicesToTraverse, prefs)
+	}
+	log.Debugf("OperatorArrayTraverse skipping %v as its a %v", matchingNode, node.Tag)
+	return list.New(), nil
 }
 
-func traverseArray(candidate *CandidateNode, operation *Operation) ([]*CandidateNode, error) {
-	log.Debug("operation Value %v", operation.Value)
-	if operation.Value == "[]" {
+func traverseMapWithIndices(candidate *CandidateNode, indices []*yaml.Node, prefs *TraversePreferences) (*list.List, error) {
+	if len(indices) == 0 {
+		return traverseMap(candidate, "", prefs, true)
+	}
 
-		var contents = candidate.Node.Content
-		var newMatches = make([]*CandidateNode, len(contents))
+	var matchingNodeMap = list.New()
+
+	for _, indexNode := range indices {
+		log.Debug("traverseMapWithIndices: %v", indexNode.Value)
+		newNodes, err := traverseMap(candidate, indexNode.Value, prefs, false)
+		if err != nil {
+			return nil, err
+		}
+		matchingNodeMap.PushBackList(newNodes)
+	}
+
+	return matchingNodeMap, nil
+}
+
+func traverseArrayWithIndices(candidate *CandidateNode, indices []*yaml.Node) (*list.List, error) {
+	log.Debug("traverseArrayWithIndices")
+	var newMatches = list.New()
+	node := UnwrapDoc(candidate.Node)
+	if len(indices) == 0 {
+		log.Debug("splatting")
 		var index int64
-		for index = 0; index < int64(len(contents)); index = index + 1 {
-			newMatches[index] = &CandidateNode{
+		for index = 0; index < int64(len(node.Content)); index = index + 1 {
+
+			newMatches.PushBack(&CandidateNode{
 				Document: candidate.Document,
-				Path:     append(candidate.Path, index),
-				Node:     contents[index],
-			}
+				Path:     candidate.CreateChildPath(index),
+				Node:     node.Content[index],
+			})
 		}
 		return newMatches, nil
 
 	}
 
-	switch operation.Value.(type) {
-	case int64:
-		index := operation.Value.(int64)
+	for _, indexNode := range indices {
+		log.Debug("traverseArrayWithIndices: '%v'", indexNode.Value)
+		index, err := strconv.ParseInt(indexNode.Value, 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("Cannot index array with '%v' (%v)", indexNode.Value, err)
+		}
 		indexToUse := index
-		contentLength := int64(len(candidate.Node.Content))
+		contentLength := int64(len(node.Content))
 		for contentLength <= index {
-			candidate.Node.Content = append(candidate.Node.Content, &yaml.Node{Tag: "!!null", Kind: yaml.ScalarNode, Value: "null"})
-			contentLength = int64(len(candidate.Node.Content))
+			node.Content = append(node.Content, &yaml.Node{Tag: "!!null", Kind: yaml.ScalarNode, Value: "null"})
+			contentLength = int64(len(node.Content))
 		}
 
 		if indexToUse < 0 {
@@ -210,14 +190,115 @@ func traverseArray(candidate *CandidateNode, operation *Operation) ([]*Candidate
 			return nil, fmt.Errorf("Index [%v] out of range, array size is %v", index, contentLength)
 		}
 
-		return []*CandidateNode{&CandidateNode{
-			Node:     candidate.Node.Content[indexToUse],
+		newMatches.PushBack(&CandidateNode{
+			Node:     node.Content[indexToUse],
 			Document: candidate.Document,
-			Path:     append(candidate.Path, index),
-		}}, nil
-	default:
-		log.Debug("argument not an int (%v), no array matches", operation.Value)
-		return nil, nil
+			Path:     candidate.CreateChildPath(index),
+		})
+	}
+	return newMatches, nil
+}
+
+func keyMatches(key *yaml.Node, wantedKey string) bool {
+	return Match(key.Value, wantedKey)
+}
+
+func traverseMap(matchingNode *CandidateNode, key string, prefs *TraversePreferences, splat bool) (*list.List, error) {
+	var newMatches = orderedmap.NewOrderedMap()
+	err := doTraverseMap(newMatches, matchingNode, key, prefs, splat)
+
+	if err != nil {
+		return nil, err
 	}
 
+	if newMatches.Len() == 0 {
+		//no matches, create one automagically
+		valueNode := &yaml.Node{Tag: "!!null", Kind: yaml.ScalarNode, Value: "null"}
+		node := matchingNode.Node
+		node.Content = append(node.Content, &yaml.Node{Kind: yaml.ScalarNode, Value: key}, valueNode)
+		candidateNode := &CandidateNode{
+			Node:     valueNode,
+			Path:     append(matchingNode.Path, key),
+			Document: matchingNode.Document,
+		}
+		newMatches.Set(candidateNode.GetKey(), candidateNode)
+
+	}
+
+	results := list.New()
+	i := 0
+	for el := newMatches.Front(); el != nil; el = el.Next() {
+		results.PushBack(el.Value)
+		i++
+	}
+	return results, nil
+}
+
+func doTraverseMap(newMatches *orderedmap.OrderedMap, candidate *CandidateNode, wantedKey string, prefs *TraversePreferences, splat bool) error {
+	// value.Content is a concatenated array of key, value,
+	// so keys are in the even indexes, values in odd.
+	// merge aliases are defined first, but we only want to traverse them
+	// if we don't find a match directly on this node first.
+
+	node := candidate.Node
+
+	var contents = node.Content
+	for index := 0; index < len(contents); index = index + 2 {
+		key := contents[index]
+		value := contents[index+1]
+
+		log.Debug("checking %v (%v)", key.Value, key.Tag)
+		//skip the 'merge' tag, find a direct match first
+		if key.Tag == "!!merge" && prefs.FollowAlias {
+			log.Debug("Merge anchor")
+			err := traverseMergeAnchor(newMatches, candidate, value, wantedKey, prefs, splat)
+			if err != nil {
+				return err
+			}
+		} else if splat || keyMatches(key, wantedKey) {
+			log.Debug("MATCHED")
+			if prefs.IncludeMapKeys {
+				candidateNode := &CandidateNode{
+					Node:     key,
+					Path:     candidate.CreateChildPath(key.Value),
+					Document: candidate.Document,
+				}
+				newMatches.Set(fmt.Sprintf("keyOf-%v", candidateNode.GetKey()), candidateNode)
+			}
+			candidateNode := &CandidateNode{
+				Node:     value,
+				Path:     candidate.CreateChildPath(key.Value),
+				Document: candidate.Document,
+			}
+			newMatches.Set(candidateNode.GetKey(), candidateNode)
+		}
+	}
+
+	return nil
+}
+
+func traverseMergeAnchor(newMatches *orderedmap.OrderedMap, originalCandidate *CandidateNode, value *yaml.Node, wantedKey string, prefs *TraversePreferences, splat bool) error {
+	switch value.Kind {
+	case yaml.AliasNode:
+		candidateNode := &CandidateNode{
+			Node:     value.Alias,
+			Path:     originalCandidate.Path,
+			Document: originalCandidate.Document,
+		}
+		return doTraverseMap(newMatches, candidateNode, wantedKey, prefs, splat)
+	case yaml.SequenceNode:
+		for _, childValue := range value.Content {
+			err := traverseMergeAnchor(newMatches, originalCandidate, childValue, wantedKey, prefs, splat)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func traverseArray(candidate *CandidateNode, operation *Operation) (*list.List, error) {
+	log.Debug("operation Value %v", operation.Value)
+	indices := []*yaml.Node{&yaml.Node{Value: operation.StringValue}}
+	return traverseArrayWithIndices(candidate, indices)
 }

pkg/yqlib/operator_traverse_path_test.go

@@ -65,7 +65,7 @@ var traversePathOperatorScenarios = []expressionScenario{
 	},
 	{
 		skipDoc:    true,
-		document:   `{}`,
+		document:   ``,
 		expression: `.[1].a`,
 		expected: []string{
 			"D0, P[1 a], (!!null)::null\n",
@@ -137,7 +137,15 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Traversing aliases with splat",
 		document:    `{a: &cat {c: frog}, b: *cat}`,
-		expression:  `.b.[]`,
+		expression:  `.b[]`,
+		expected: []string{
+			"D0, P[b c], (!!str)::frog\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: &cat {c: frog}, b: *cat}`,
+		expression: `.b.[]`,
 		expected: []string{
 			"D0, P[b c], (!!str)::frog\n",
 		},
@@ -150,16 +158,10 @@ var traversePathOperatorScenarios = []expressionScenario{
 			"D0, P[b c], (!!str)::frog\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   `[1,2,3]`,
-		expression: `.b`,
-		expected:   []string{},
-	},
 	{
 		description: "Traversing arrays by index",
 		document:    `[1,2,3]`,
-		expression:  `[0]`,
+		expression:  `.[0]`,
 		expected: []string{
 			"D0, P[0], (!!int)::1\n",
 		},
@@ -167,7 +169,7 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Maps with numeric keys",
 		document:    `{2: cat}`,
-		expression:  `[2]`,
+		expression:  `.[2]`,
 		expected: []string{
 			"D0, P[2], (!!str)::cat\n",
 		},
@@ -175,7 +177,7 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Maps with non existing numeric keys",
 		document:    `{a: b}`,
-		expression:  `[0]`,
+		expression:  `.[0]`,
 		expected: []string{
 			"D0, P[0], (!!null)::null\n",
 		},
@@ -215,7 +217,17 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Splatting merge anchors",
 		document:    mergeDocSample,
-		expression:  `.foobar.[]`,
+		expression:  `.foobar[]`,
+		expected: []string{
+			"D0, P[foobar c], (!!str)::foo_c\n",
+			"D0, P[foobar a], (!!str)::foo_a\n",
+			"D0, P[foobar thing], (!!str)::foobar_thing\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   mergeDocSample,
+		expression: `.foobar.[]`,
 		expected: []string{
 			"D0, P[foobar c], (!!str)::foo_c\n",
 			"D0, P[foobar a], (!!str)::foo_a\n",
@@ -266,7 +278,7 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Splatting merge anchor lists",
 		document:    mergeDocSample,
-		expression:  `.foobarList.[]`,
+		expression:  `.foobarList[]`,
 		expected: []string{
 			"D0, P[foobarList b], (!!str)::bar_b\n",
 			"D0, P[foobarList a], (!!str)::foo_a\n",
@@ -274,6 +286,123 @@ var traversePathOperatorScenarios = []expressionScenario{
 			"D0, P[foobarList c], (!!str)::foobarList_c\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   mergeDocSample,
+		expression: `.foobarList.[]`,
+		expected: []string{
+			"D0, P[foobarList b], (!!str)::bar_b\n",
+			"D0, P[foobarList a], (!!str)::foo_a\n",
+			"D0, P[foobarList thing], (!!str)::bar_thing\n",
+			"D0, P[foobarList c], (!!str)::foobarList_c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[a,b,c]`,
+		expression: `.[]`,
+		expected: []string{
+			"D0, P[0], (!!str)::a\n",
+			"D0, P[1], (!!str)::b\n",
+			"D0, P[2], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[a,b,c]`,
+		expression: `[]`,
+		expected: []string{
+			"D0, P[], (!!seq)::[]\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a[0]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+		},
+	},
+	{
+		description: "Select multiple indices",
+		document:    `{a: [a,b,c]}`,
+		expression:  `.a[0, 2]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+			"D0, P[a 2], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a.[0, 2]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+			"D0, P[a 2], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a[-1]`,
+		expected: []string{
+			"D0, P[a -1], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a.[-1]`,
+		expected: []string{
+			"D0, P[a -1], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a[-2]`,
+		expected: []string{
+			"D0, P[a -2], (!!str)::b\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a.[-2]`,
+		expected: []string{
+			"D0, P[a -2], (!!str)::b\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a[]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+			"D0, P[a 1], (!!str)::b\n",
+			"D0, P[a 2], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a.[]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+			"D0, P[a 1], (!!str)::b\n",
+			"D0, P[a 2], (!!str)::c\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `{a: [a,b,c]}`,
+		expression: `.a | .[]`,
+		expected: []string{
+			"D0, P[a 0], (!!str)::a\n",
+			"D0, P[a 1], (!!str)::b\n",
+			"D0, P[a 2], (!!str)::c\n",
+		},
+	},
 }
 
 func TestTraversePathOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_value_test.go

@@ -36,13 +36,22 @@ var valueOperatorScenarios = []expressionScenario{
 		expected: []string{
 			"D0, P[], (!!float)::5e-10\n",
 		},
-	}, {
+	},
+	{
 		document:   ``,
 		expression: `"cat"`,
 		expected: []string{
 			"D0, P[], (!!str)::cat\n",
 		},
-	}, {
+	},
+	{
+		document:   ``,
+		expression: `"frog jumps"`,
+		expected: []string{
+			"D0, P[], (!!str)::frog jumps\n",
+		},
+	},
+	{
 		document:   ``,
 		expression: `"1.3"`,
 		expected: []string{

pkg/yqlib/operators.go

@@ -20,14 +20,6 @@ func EmptyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	return list.New(), nil
 }
 
-func PipeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
-	if err != nil {
-		return nil, err
-	}
-	return d.GetMatchingNodes(lhs, pathNode.Rhs)
-}
-
 func createBooleanCandidate(owner *CandidateNode, value bool) *CandidateNode {
 	valString := "true"
 	if !value {
@@ -43,28 +35,14 @@ func nodeToMap(candidate *CandidateNode) *list.List {
 	return elMap
 }
 
-func LengthOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	log.Debugf("-- lengthOperation")
-	var results = list.New()
-
-	for el := matchMap.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		var length int
-		switch candidate.Node.Kind {
-		case yaml.ScalarNode:
-			length = len(candidate.Node.Value)
-		case yaml.MappingNode:
-			length = len(candidate.Node.Content) / 2
-		case yaml.SequenceNode:
-			length = len(candidate.Node.Content)
-		default:
-			length = 0
-		}
-
-		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"}
-		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
-		results.PushBack(lengthCand)
+func createTraversalTree(path []interface{}) *PathTreeNode {
+	if len(path) == 0 {
+		return &PathTreeNode{Operation: &Operation{OperationType: SelfReference}}
+	} else if len(path) == 1 {
+		return &PathTreeNode{Operation: &Operation{OperationType: TraversePath, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}}
 	}
-
-	return results, nil
+	return &PathTreeNode{
+		Operation: &Operation{OperationType: ShortPipe},
+		Lhs:       createTraversalTree(path[0:1]),
+		Rhs:       createTraversalTree(path[1:])}
 }

pkg/yqlib/operators_test.go

@@ -11,12 +11,14 @@ import (
 	"testing"
 
 	"github.com/mikefarah/yq/v4/test"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type expressionScenario struct {
 	description           string
 	subdescription        string
 	document              string
+	document2             string
 	expression            string
 	expected              []string
 	skipDoc               bool
@@ -37,15 +39,32 @@ func testScenario(t *testing.T, s *expressionScenario) {
 	if s.document != "" {
 		inputs, err = readDocuments(strings.NewReader(s.document), "sample.yml", 0)
 		if err != nil {
-			t.Error(err)
+			t.Error(err, s.document, s.expression)
 			return
 		}
+		if s.document2 != "" {
+			moreInputs, err := readDocuments(strings.NewReader(s.document2), "another.yml", 1)
+			if err != nil {
+				t.Error(err, s.document, s.expression)
+				return
+			}
+			inputs.PushBackList(moreInputs)
+		}
+	} else {
+		candidateNode := &CandidateNode{
+			Document:  0,
+			Filename:  "",
+			Node:      &yaml.Node{Tag: "!!null"},
+			FileIndex: 0,
+		}
+		inputs.PushBack(candidateNode)
+
 	}
 
 	results, err = treeNavigator.GetMatchingNodes(inputs, node)
 
 	if err != nil {
-		t.Error(err)
+		t.Error(fmt.Errorf("%v: %v", err, s.expression))
 		return
 	}
 	test.AssertResultComplexWithContext(t, s.expected, resultsToString(results), fmt.Sprintf("exp: %v\ndoc: %v", s.expression, s.document))
@@ -82,7 +101,7 @@ func copyFromHeader(title string, out *os.File) error {
 	return err
 }
 
-func formatYaml(yaml string) string {
+func formatYaml(yaml string, filename string) string {
 	var output bytes.Buffer
 	printer := NewPrinter(bufio.NewWriter(&output), false, true, false, 2, true)
 
@@ -91,7 +110,7 @@ func formatYaml(yaml string) string {
 		panic(err)
 	}
 	streamEvaluator := NewStreamEvaluator()
-	err = streamEvaluator.Evaluate("sample.yaml", strings.NewReader(yaml), node, printer)
+	err = streamEvaluator.Evaluate(filename, strings.NewReader(yaml), node, printer)
 	if err != nil {
 		panic(err)
 	}
@@ -118,63 +137,116 @@ func documentScenarios(t *testing.T, title string, scenarios []expressionScenari
 
 	for _, s := range scenarios {
 		if !s.skipDoc {
-
-			writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
-
-			if s.subdescription != "" {
-				writeOrPanic(w, s.subdescription)
-				writeOrPanic(w, "\n\n")
-			}
-			formattedDoc := ""
-			if s.document != "" {
-				if s.dontFormatInputForDoc {
-					formattedDoc = s.document + "\n"
-				} else {
-					formattedDoc = formatYaml(s.document)
-				}
-				//TODO: pretty here
-				writeOrPanic(w, "Given a sample.yml file of:\n")
-
-				writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n", formattedDoc))
-				writeOrPanic(w, "then\n")
-				if s.expression != "" {
-					writeOrPanic(w, fmt.Sprintf("```bash\nyq eval '%v' sample.yml\n```\n", s.expression))
-				} else {
-					writeOrPanic(w, "```bash\nyq eval sample.yml\n```\n")
-				}
-			} else {
-				writeOrPanic(w, "Running\n")
-				writeOrPanic(w, fmt.Sprintf("```bash\nyq eval --null-input '%v'\n```\n", s.expression))
-			}
-
-			writeOrPanic(w, "will output\n")
-
-			var output bytes.Buffer
-			var err error
-			printer := NewPrinter(bufio.NewWriter(&output), false, true, false, 2, true)
-
-			if s.document != "" {
-				node, err := treeCreator.ParsePath(s.expression)
-				if err != nil {
-					t.Error(err)
-				}
-				streamEvaluator := NewStreamEvaluator()
-				err = streamEvaluator.Evaluate("sample.yaml", strings.NewReader(formattedDoc), node, printer)
-				if err != nil {
-					t.Error(err)
-				}
-			} else {
-				allAtOnceEvaluator := NewAllAtOnceEvaluator()
-				err = allAtOnceEvaluator.EvaluateFiles(s.expression, []string{}, printer)
-				if err != nil {
-					t.Error(err)
-				}
-			}
-
-			writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n", output.String()))
-
+			documentScenario(t, w, s)
 		}
-
 	}
 	w.Flush()
 }
+
+func documentScenario(t *testing.T, w *bufio.Writer, s expressionScenario) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	formattedDoc, formattedDoc2 := documentInput(w, s)
+
+	writeOrPanic(w, "will output\n")
+
+	documentOutput(t, w, s, formattedDoc, formattedDoc2)
+}
+
+func documentInput(w *bufio.Writer, s expressionScenario) (string, string) {
+	formattedDoc := ""
+	formattedDoc2 := ""
+	command := "eval"
+	if s.document != "" {
+		if s.dontFormatInputForDoc {
+			formattedDoc = s.document + "\n"
+		} else {
+			formattedDoc = formatYaml(s.document, "sample.yml")
+		}
+
+		writeOrPanic(w, "Given a sample.yml file of:\n")
+		writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n", formattedDoc))
+
+		files := "sample.yml"
+
+		if s.document2 != "" {
+			if s.dontFormatInputForDoc {
+				formattedDoc2 = s.document2 + "\n"
+			} else {
+				formattedDoc2 = formatYaml(s.document2, "another.yml")
+			}
+
+			writeOrPanic(w, "And another sample another.yml file of:\n")
+			writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n", formattedDoc2))
+			files = "sample.yml another.yml"
+			command = "eval-all"
+		}
+
+		writeOrPanic(w, "then\n")
+		if s.expression != "" {
+			writeOrPanic(w, fmt.Sprintf("```bash\nyq %v '%v' %v\n```\n", command, s.expression, files))
+		} else {
+			writeOrPanic(w, fmt.Sprintf("```bash\nyq %v %v\n```\n", command, files))
+		}
+	} else {
+		writeOrPanic(w, "Running\n")
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq %v --null-input '%v'\n```\n", command, s.expression))
+	}
+	return formattedDoc, formattedDoc2
+}
+
+func documentOutput(t *testing.T, w *bufio.Writer, s expressionScenario, formattedDoc string, formattedDoc2 string) {
+	var output bytes.Buffer
+	var err error
+	printer := NewPrinter(bufio.NewWriter(&output), false, true, false, 2, true)
+
+	node, err := treeCreator.ParsePath(s.expression)
+	if err != nil {
+		t.Error(fmt.Errorf("Error parsing expression %v of %v: %v", s.expression, s.description, err))
+		return
+	}
+
+	inputs := list.New()
+
+	if s.document != "" {
+		inputs, err = readDocuments(strings.NewReader(formattedDoc), "sample.yml", 0)
+		if err != nil {
+			t.Error(err, s.document, s.expression)
+			return
+		}
+		if s.document2 != "" {
+			moreInputs, err := readDocuments(strings.NewReader(formattedDoc2), "another.yml", 1)
+			if err != nil {
+				t.Error(err, s.document, s.expression)
+				return
+			}
+			inputs.PushBackList(moreInputs)
+		}
+	} else {
+		candidateNode := &CandidateNode{
+			Document:  0,
+			Filename:  "",
+			Node:      &yaml.Node{Tag: "!!null"},
+			FileIndex: 0,
+		}
+		inputs.PushBack(candidateNode)
+
+	}
+
+	results, err := treeNavigator.GetMatchingNodes(inputs, node)
+	if err != nil {
+		t.Error(err, s.expression)
+	}
+
+	err = printer.PrintResults(results)
+	if err != nil {
+		t.Error(err, s.expression)
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n", output.String()))
+}

pkg/yqlib/path_parse_test.go

@@ -11,68 +11,76 @@ var pathTests = []struct {
 	path            string
 	expectedTokens  []interface{}
 	expectedPostFix []interface{}
-}{ // TODO: Ensure ALL documented examples have tests! sheesh
-	// {"len(.)", append(make([]interface{}, 0), "LENGTH", "(", "SELF", ")")},
-	// {"\"len\"(.)", append(make([]interface{}, 0), "len", "TRAVERSE", "(", "SELF", ")")},
-	// {".a OR (.b OR .c)", append(make([]interface{}, 0), "a", "OR", "(", "b", "OR", "c", ")")},
-	// {"a OR (b OR c)", append(make([]interface{}, 0), "a", "OR", "(", "b", "OR", "c", ")")},
-	// {"a .- (b OR c)", append(make([]interface{}, 0), "a", " .- ", "(", "b", "OR", "c", ")")},
-	// {"(animal==3)", append(make([]interface{}, 0), "(", "animal", "==", int64(3), ")")},
-	// {"(animal==f3)", append(make([]interface{}, 0), "(", "animal", "==", "f3", ")")},
-	// {"apples.BANANAS", append(make([]interface{}, 0), "apples", "TRAVERSE", "BANANAS")},
-	// {"appl*.BANA*", append(make([]interface{}, 0), "appl*", "TRAVERSE", "BANA*")},
-	// {"a.b.**", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "**")},
-	// {"a.\"=\".frog", append(make([]interface{}, 0), "a", "TRAVERSE", "=", "TRAVERSE", "frog")},
-	// {"a.b.*", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "*")},
-	// {"a.b.thin*", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "thin*")},
-	// {".a.b.[0]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", int64(0))},
-	// {".a.b.[]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[]")},
-	// {".a.b.[+]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[+]")},
-	// {".a.b.[-12]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", int64(-12))},
-	// {".a.b.0", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "0")},
-	// {".a", append(make([]interface{}, 0), "a")},
-	// {".\"a.b\".c", append(make([]interface{}, 0), "a.b", "TRAVERSE", "c")},
-	// {`.b."foo.bar"`, append(make([]interface{}, 0), "b", "TRAVERSE", "foo.bar")},
-	// {`f | . == *og | length`, append(make([]interface{}, 0), "f", "TRAVERSE", "SELF", "EQUALS", "*og", "TRAVERSE", "LENGTH")},
-	// {`.a, .b`, append(make([]interface{}, 0), "a", "OR", "b")},
-	// {`[.a, .b]`, append(make([]interface{}, 0), "[", "a", "OR", "b", "]")},
-	// {`."[a", ."b]"`, append(make([]interface{}, 0), "[a", "OR", "b]")},
-	// {`.a.[]`, append(make([]interface{}, 0), "a", "PIPE", "[]")},
-	// {`.[].a`, append(make([]interface{}, 0), "[]", "PIPE", "a")},
-	// {
-	// 	`["cat"]`,
-	// 	append(make([]interface{}, 0), "[", "cat (string)", "]"),
-	// 	append(make([]interface{}, 0), "cat (string)", "COLLECT", "PIPE"),
-	// },
+}{
 	{
 		`[]`,
 		append(make([]interface{}, 0), "[", "]"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT", "PIPE"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE"),
+	},
+	{
+		`.[]`,
+		append(make([]interface{}, 0), "TRAVERSE_ARRAY", "[", "]"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
+	},
+	{
+		`.a[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "]"),
+		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE"),
+	},
+	{
+		`.a.[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "]"),
+		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE"),
+	},
+	{
+		`.a[0]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
+		append(make([]interface{}, 0), "a", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE"),
+	},
+	{
+		`.a.[0]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
+		append(make([]interface{}, 0), "a", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE"),
+	},
+	{
+		`.a[].c`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "]", "SHORT_PIPE", "c"),
+		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE", "c", "SHORT_PIPE"),
+	},
+	{
+		`[3]`,
+		append(make([]interface{}, 0), "[", "3 (int64)", "]"),
+		append(make([]interface{}, 0), "3 (int64)", "COLLECT", "SHORT_PIPE"),
 	},
 	{
 		`d0.a`,
-		append(make([]interface{}, 0), "d0", "PIPE", "a"),
-		append(make([]interface{}, 0), "d0", "a", "PIPE"),
+		append(make([]interface{}, 0), "d0", "SHORT_PIPE", "a"),
+		append(make([]interface{}, 0), "d0", "a", "SHORT_PIPE"),
 	},
 	{
-		`.a | (.[].b == "apple")`,
-		append(make([]interface{}, 0), "a", "PIPE", "(", "[]", "PIPE", "b", "EQUALS", "apple (string)", ")"),
-		append(make([]interface{}, 0), "a", "[]", "b", "PIPE", "apple (string)", "EQUALS", "PIPE"),
+		`.a | .[].b == "apple"`,
+		append(make([]interface{}, 0), "a", "PIPE", "TRAVERSE_ARRAY", "[", "]", "SHORT_PIPE", "b", "EQUALS", "apple (string)"),
+		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "b", "SHORT_PIPE", "apple (string)", "EQUALS", "PIPE"),
+	},
+	{
+		`(.a | .[].b) == "apple"`,
+		append(make([]interface{}, 0), "(", "a", "PIPE", "TRAVERSE_ARRAY", "[", "]", "SHORT_PIPE", "b", ")", "EQUALS", "apple (string)"),
+		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "b", "SHORT_PIPE", "PIPE", "apple (string)", "EQUALS"),
 	},
 	{
 		`.[] | select(. == "*at")`,
-		append(make([]interface{}, 0), "[]", "PIPE", "SELECT", "(", "SELF", "EQUALS", "*at (string)", ")"),
-		append(make([]interface{}, 0), "[]", "SELF", "*at (string)", "EQUALS", "SELECT", "PIPE"),
+		append(make([]interface{}, 0), "TRAVERSE_ARRAY", "[", "]", "PIPE", "SELECT", "(", "SELF", "EQUALS", "*at (string)", ")"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SELF", "*at (string)", "EQUALS", "SELECT", "PIPE"),
 	},
 	{
 		`[true]`,
 		append(make([]interface{}, 0), "[", "true (bool)", "]"),
-		append(make([]interface{}, 0), "true (bool)", "COLLECT", "PIPE"),
+		append(make([]interface{}, 0), "true (bool)", "COLLECT", "SHORT_PIPE"),
 	},
 	{
 		`[true, false]`,
 		append(make([]interface{}, 0), "[", "true (bool)", "UNION", "false (bool)", "]"),
-		append(make([]interface{}, 0), "true (bool)", "false (bool)", "UNION", "COLLECT", "PIPE"),
+		append(make([]interface{}, 0), "true (bool)", "false (bool)", "UNION", "COLLECT", "SHORT_PIPE"),
 	},
 	{
 		`"mike": .a`,
@@ -87,27 +95,27 @@ var pathTests = []struct {
 	{
 		`{"mike": .a}`,
 		append(make([]interface{}, 0), "{", "mike (string)", "CREATE_MAP", "a", "}"),
-		append(make([]interface{}, 0), "mike (string)", "a", "CREATE_MAP", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "mike (string)", "a", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
 	{
 		`{.a: "mike"}`,
 		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "mike (string)", "}"),
-		append(make([]interface{}, 0), "a", "mike (string)", "CREATE_MAP", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "a", "mike (string)", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
 	{
 		`{.a: .c, .b.[]: .f.g.[]}`,
-		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "c", "UNION", "b", "PIPE", "[]", "CREATE_MAP", "f", "PIPE", "g", "PIPE", "[]", "}"),
-		append(make([]interface{}, 0), "a", "c", "CREATE_MAP", "b", "[]", "PIPE", "f", "g", "PIPE", "[]", "PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "c", "UNION", "b", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "]", "CREATE_MAP", "f", "SHORT_PIPE", "g", "SHORT_PIPE", "TRAVERSE_ARRAY", "[", "]", "}"),
+		append(make([]interface{}, 0), "a", "c", "CREATE_MAP", "b", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE", "f", "g", "SHORT_PIPE", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
 	{
 		`explode(.a.b)`,
-		append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
+		append(make([]interface{}, 0), "EXPLODE", "(", "a", "SHORT_PIPE", "b", ")"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "EXPLODE"),
 	},
 	{
 		`.a.b style="folded"`,
-		append(make([]interface{}, 0), "a", "PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "folded (string)", "ASSIGN_STYLE"),
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "folded (string)", "ASSIGN_STYLE"),
 	},
 	{
 		`tag == "str"`,
@@ -129,12 +137,16 @@ var pathTests = []struct {
 		append(make([]interface{}, 0), "SELF", "ASSIGN_COMMENT", "str (string)"),
 		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
 	},
-
-	// {
-	// 	`.a.b tag="!!str"`,
-	// 	append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
-	// 	append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
-	// },
+	{
+		`. lineComment |= "str"`,
+		append(make([]interface{}, 0), "SELF", "ASSIGN_COMMENT", "str (string)"),
+		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
+	},
+	{
+		`.a.b tag="!!str"`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_TAG", "!!str (string)"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "!!str (string)", "ASSIGN_TAG"),
+	},
 	{
 		`""`,
 		append(make([]interface{}, 0), " (string)"),
@@ -148,27 +160,8 @@ var pathTests = []struct {
 	{
 		`{}`,
 		append(make([]interface{}, 0), "{", "}"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
-
-	// {".animals | .==cat", append(make([]interface{}, 0), "animals", "TRAVERSE", "SELF", "EQUALS", "cat")},
-	// {".animals | (. == cat)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "SELF", "EQUALS", "cat", ")")},
-	// {".animals | (.==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "SELF", "EQUALS", "c*", ")")},
-	// {"animals(a.b==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "a", "TRAVERSE", "b", "==", "c*", ")")},
-	// {"animals.(a.b==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "a", "TRAVERSE", "b", "==", "c*", ")")},
-	// {"(a.b==c*).animals", append(make([]interface{}, 0), "(", "a", "TRAVERSE", "b", "==", "c*", ")", "TRAVERSE", "animals")},
-	// {"(a.b==c*)animals", append(make([]interface{}, 0), "(", "a", "TRAVERSE", "b", "==", "c*", ")", "TRAVERSE", "animals")},
-	// {"[1].a.d", append(make([]interface{}, 0), int64(1), "TRAVERSE", "a", "TRAVERSE", "d")},
-	// {"[1]a.d", append(make([]interface{}, 0), int64(1), "TRAVERSE", "a", "TRAVERSE", "d")},
-	// {"a[0]c", append(make([]interface{}, 0), "a", "TRAVERSE", int64(0), "TRAVERSE", "c")},
-	// {"a.[0].c", append(make([]interface{}, 0), "a", "TRAVERSE", int64(0), "TRAVERSE", "c")},
-	// {"[0]", append(make([]interface{}, 0), int64(0))},
-	// {"0", append(make([]interface{}, 0), int64(0))},
-	// {"a.b[+]c", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[+]", "TRAVERSE", "c")},
-	// {"a.cool(s.d.f == cool)", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", " == ", "cool", ")")},
-	// {"a.cool.(s.d.f==cool OR t.b.h==frog).caterpillar", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "OR", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "caterpillar")},
-	// {"a.cool(s.d.f==cool and t.b.h==frog)*", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "and", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "*")},
-	// {"a.cool(s.d.f==cool and t.b.h==frog).th*", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "and", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "th*")},
 }
 
 var tokeniser = NewPathTokeniser()

pkg/yqlib/path_postfix.go

@@ -56,7 +56,7 @@ func (p *pathPostFixer) ConvertToPostfix(infixTokens []*Token) ([]*Operation, er
 			// now we should have [] as the last element on the opStack, get rid of it
 			opStack = opStack[0 : len(opStack)-1]
 			//and append a collect to the opStack
-			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: Pipe}})
+			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: ShortPipe}})
 			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: collectOperator}})
 		case CloseBracket:
 			for len(opStack) > 0 && opStack[len(opStack)-1].TokenType != OpenBracket {

pkg/yqlib/path_tokeniser.go

@@ -1,6 +1,7 @@
 package yqlib
 
 import (
+	"fmt"
 	"strconv"
 
 	lex "github.com/timtadh/lexmachine"
@@ -21,6 +22,7 @@ const (
 	CloseCollect
 	OpenCollectObject
 	CloseCollectObject
+	TraverseArrayCollect
 )
 
 type Token struct {
@@ -47,6 +49,9 @@ func (t *Token) toString() string {
 		return "{"
 	} else if t.TokenType == CloseCollectObject {
 		return "}"
+	} else if t.TokenType == TraverseArrayCollect {
+		return ".["
+
 	} else {
 		return "NFI"
 	}
@@ -87,6 +92,15 @@ func opAssignableToken(opType *OperationType, assignOpType *OperationType) lex.A
 	return opTokenWithPrefs(opType, assignOpType, nil)
 }
 
+func assignOpToken(updateAssign bool) lex.Action {
+	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
+		log.Debug("assignOpToken %v", string(m.Bytes))
+		value := string(m.Bytes)
+		op := &Operation{OperationType: Assign, Value: Assign.Type, StringValue: value, UpdateAssign: updateAssign}
+		return &Token{TokenType: OperationToken, Operation: op}, nil
+	}
+}
+
 func opTokenWithPrefs(op *OperationType, assignOpType *OperationType, preferences interface{}) lex.Action {
 	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
 		log.Debug("opTokenWithPrefs %v", string(m.Bytes))
@@ -100,6 +114,21 @@ func opTokenWithPrefs(op *OperationType, assignOpType *OperationType, preference
 	}
 }
 
+func assignAllCommentsOp(updateAssign bool) lex.Action {
+	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
+		log.Debug("assignAllCommentsOp %v", string(m.Bytes))
+		value := string(m.Bytes)
+		op := &Operation{
+			OperationType: AssignComment,
+			Value:         AssignComment.Type,
+			StringValue:   value,
+			UpdateAssign:  updateAssign,
+			Preferences:   &CommentOpPreferences{LineComment: true, HeadComment: true, FootComment: true},
+		}
+		return &Token{TokenType: OperationToken, Operation: op}, nil
+	}
+}
+
 func literalToken(pType TokenType, checkForPost bool) lex.Action {
 	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
 		return &Token{TokenType: pType, CheckForPostTraverse: checkForPost}, nil
@@ -110,23 +139,6 @@ func unwrap(value string) string {
 	return value[1 : len(value)-1]
 }
 
-func arrayIndextoken(precedingDot bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var numberString = string(m.Bytes)
-		startIndex := 1
-		if precedingDot {
-			startIndex = 2
-		}
-		numberString = numberString[startIndex : len(numberString)-1]
-		var number, errParsingInt = strconv.ParseInt(numberString, 10, 64) // nolint
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-		op := &Operation{OperationType: TraversePath, Value: number, StringValue: numberString}
-		return &Token{TokenType: OperationToken, Operation: op, CheckForPostTraverse: true}, nil
-	}
-}
-
 func numberValue() lex.Action {
 	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
 		var numberString = string(m.Bytes)
@@ -184,26 +196,36 @@ func initLexer() (*lex.Lexer, error) {
 	lexer.Add([]byte(`\(`), literalToken(OpenBracket, false))
 	lexer.Add([]byte(`\)`), literalToken(CloseBracket, true))
 
-	lexer.Add([]byte(`\.\[\]`), pathToken(false))
-	lexer.Add([]byte(`\.\.`), opToken(RecursiveDescent))
+	lexer.Add([]byte(`\.\[`), literalToken(TraverseArrayCollect, false))
+	lexer.Add([]byte(`\.\.`), opTokenWithPrefs(RecursiveDescent, nil, &RecursiveDescentPreferences{RecurseArray: true,
+		TraversePreferences: &TraversePreferences{FollowAlias: false, IncludeMapKeys: false}}))
+
+	lexer.Add([]byte(`\.\.\.`), opTokenWithPrefs(RecursiveDescent, nil, &RecursiveDescentPreferences{RecurseArray: true,
+		TraversePreferences: &TraversePreferences{FollowAlias: false, IncludeMapKeys: true}}))
 
 	lexer.Add([]byte(`,`), opToken(Union))
 	lexer.Add([]byte(`:\s*`), opToken(CreateMap))
 	lexer.Add([]byte(`length`), opToken(Length))
+	lexer.Add([]byte(`sortKeys`), opToken(SortKeys))
 	lexer.Add([]byte(`select`), opToken(Select))
 	lexer.Add([]byte(`has`), opToken(Has))
 	lexer.Add([]byte(`explode`), opToken(Explode))
 	lexer.Add([]byte(`or`), opToken(Or))
 	lexer.Add([]byte(`and`), opToken(And))
 	lexer.Add([]byte(`not`), opToken(Not))
+	lexer.Add([]byte(`\/\/`), opToken(Alternative))
 
 	lexer.Add([]byte(`documentIndex`), opToken(GetDocumentIndex))
+	lexer.Add([]byte(`di`), opToken(GetDocumentIndex))
 
 	lexer.Add([]byte(`style`), opAssignableToken(GetStyle, AssignStyle))
 
 	lexer.Add([]byte(`tag`), opAssignableToken(GetTag, AssignTag))
+	lexer.Add([]byte(`anchor`), opAssignableToken(GetAnchor, AssignAnchor))
+	lexer.Add([]byte(`alias`), opAssignableToken(GetAlias, AssignAlias))
 	lexer.Add([]byte(`filename`), opToken(GetFilename))
 	lexer.Add([]byte(`fileIndex`), opToken(GetFileIndex))
+	lexer.Add([]byte(`fi`), opToken(GetFileIndex))
 	lexer.Add([]byte(`path`), opToken(GetPath))
 
 	lexer.Add([]byte(`lineComment`), opTokenWithPrefs(GetComment, AssignComment, &CommentOpPreferences{LineComment: true}))
@@ -212,19 +234,17 @@ func initLexer() (*lex.Lexer, error) {
 
 	lexer.Add([]byte(`footComment`), opTokenWithPrefs(GetComment, AssignComment, &CommentOpPreferences{FootComment: true}))
 
-	lexer.Add([]byte(`comments\s*=`), opTokenWithPrefs(AssignComment, nil, &CommentOpPreferences{LineComment: true, HeadComment: true, FootComment: true}))
+	lexer.Add([]byte(`comments\s*=`), assignAllCommentsOp(false))
+	lexer.Add([]byte(`comments\s*\|=`), assignAllCommentsOp(true))
 
 	lexer.Add([]byte(`collect`), opToken(Collect))
 
 	lexer.Add([]byte(`\s*==\s*`), opToken(Equals))
-	lexer.Add([]byte(`\s*=\s*`), opTokenWithPrefs(Assign, nil, &AssignOpPreferences{false}))
+	lexer.Add([]byte(`\s*=\s*`), assignOpToken(false))
 
 	lexer.Add([]byte(`del`), opToken(DeleteChild))
 
-	lexer.Add([]byte(`\s*\|=\s*`), opTokenWithPrefs(Assign, nil, &AssignOpPreferences{true}))
-
-	lexer.Add([]byte(`\[-?[0-9]+\]`), arrayIndextoken(false))
-	lexer.Add([]byte(`\.\[-?[0-9]+\]`), arrayIndextoken(true))
+	lexer.Add([]byte(`\s*\|=\s*`), assignOpToken(true))
 
 	lexer.Add([]byte("( |\t|\n|\r)+"), skip)
 
@@ -245,14 +265,16 @@ func initLexer() (*lex.Lexer, error) {
 	lexer.Add([]byte(`[Nn][Uu][Ll][Ll]`), nullValue())
 	lexer.Add([]byte(`~`), nullValue())
 
-	lexer.Add([]byte(`"[^ "]*"`), stringValue(true))
+	lexer.Add([]byte(`"[^"]*"`), stringValue(true))
 
 	lexer.Add([]byte(`\[`), literalToken(OpenCollect, false))
 	lexer.Add([]byte(`\]`), literalToken(CloseCollect, true))
 	lexer.Add([]byte(`\{`), literalToken(OpenCollectObject, false))
 	lexer.Add([]byte(`\}`), literalToken(CloseCollectObject, true))
-	lexer.Add([]byte(`\*`), opToken(Multiply))
+	lexer.Add([]byte(`\*`), opTokenWithPrefs(Multiply, nil, &MultiplyPreferences{AppendArrays: false}))
+	lexer.Add([]byte(`\*\+`), opTokenWithPrefs(Multiply, nil, &MultiplyPreferences{AppendArrays: true}))
 	lexer.Add([]byte(`\+`), opToken(Add))
+	lexer.Add([]byte(`\+=`), opToken(AddAssign))
 
 	err := lexer.Compile()
 	if err != nil {
@@ -281,7 +303,7 @@ func (p *pathTokeniser) Tokenise(path string) ([]*Token, error) {
 	scanner, err := p.lexer.Scanner([]byte(path))
 
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Parsing expression: %v", err)
 	}
 	var tokens []*Token
 	for tok, err, eof := scanner.Next(); !eof; tok, err, eof = scanner.Next() {
@@ -292,35 +314,70 @@ func (p *pathTokeniser) Tokenise(path string) ([]*Token, error) {
 			tokens = append(tokens, token)
 		}
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("Parsing expression: %v", err)
 		}
 	}
 	var postProcessedTokens = make([]*Token, 0)
 
 	skipNextToken := false
 
-	for index, token := range tokens {
+	for index := range tokens {
 		if skipNextToken {
 			skipNextToken = false
 		} else {
-
-			if index != len(tokens)-1 && token.AssignOperation != nil &&
-				tokens[index+1].TokenType == OperationToken &&
-				tokens[index+1].Operation.OperationType == Assign {
-				token.Operation = token.AssignOperation
-				skipNextToken = true
-			}
-
-			postProcessedTokens = append(postProcessedTokens, token)
-
-			if index != len(tokens)-1 && token.CheckForPostTraverse &&
-				tokens[index+1].TokenType == OperationToken &&
-				tokens[index+1].Operation.OperationType == TraversePath {
-				op := &Operation{OperationType: Pipe, Value: "PIPE"}
-				postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
-			}
+			postProcessedTokens, skipNextToken = p.handleToken(tokens, index, postProcessedTokens)
 		}
 	}
 
 	return postProcessedTokens, nil
 }
+
+func (p *pathTokeniser) handleToken(tokens []*Token, index int, postProcessedTokens []*Token) (tokensAccum []*Token, skipNextToken bool) {
+	skipNextToken = false
+	token := tokens[index]
+
+	if token.TokenType == TraverseArrayCollect {
+		//need to put a traverse array then a collect token
+		// do this by adding traverse then converting token to collect
+
+		op := &Operation{OperationType: TraverseArray, StringValue: "TRAVERSE_ARRAY"}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+
+		token = &Token{TokenType: OpenCollect}
+
+	}
+
+	if index != len(tokens)-1 && token.AssignOperation != nil &&
+		tokens[index+1].TokenType == OperationToken &&
+		tokens[index+1].Operation.OperationType == Assign {
+		token.Operation = token.AssignOperation
+		token.Operation.UpdateAssign = tokens[index+1].Operation.UpdateAssign
+		skipNextToken = true
+	}
+
+	postProcessedTokens = append(postProcessedTokens, token)
+
+	if index != len(tokens)-1 && token.CheckForPostTraverse &&
+		tokens[index+1].TokenType == OperationToken &&
+		tokens[index+1].Operation.OperationType == TraversePath {
+		op := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+	}
+	if index != len(tokens)-1 && token.CheckForPostTraverse &&
+		tokens[index+1].TokenType == OpenCollect {
+
+		op := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+
+		op = &Operation{OperationType: TraverseArray}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+	}
+	if index != len(tokens)-1 && token.CheckForPostTraverse &&
+		tokens[index+1].TokenType == TraverseArrayCollect {
+
+		op := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+
+	}
+	return postProcessedTokens, skipNextToken
+}

pkg/yqlib/path_tree.go

@@ -1,6 +1,9 @@
 package yqlib
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 var myPathTokeniser = NewPathTokeniser()
 var myPathPostfixer = NewPathPostFixer()
@@ -49,10 +52,16 @@ func (p *pathTreeCreator) CreatePathTree(postFixPath []*Operation) (*PathTreeNod
 		if Operation.OperationType.NumArgs > 0 {
 			numArgs := Operation.OperationType.NumArgs
 			if numArgs == 1 {
+				if len(stack) < 1 {
+					return nil, fmt.Errorf("'%v' expects 1 arg but received none", strings.TrimSpace(Operation.StringValue))
+				}
 				remaining, rhs := stack[:len(stack)-1], stack[len(stack)-1]
 				newNode.Rhs = rhs
 				stack = remaining
 			} else if numArgs == 2 {
+				if len(stack) < 2 {
+					return nil, fmt.Errorf("'%v' expects 2 args but there is %v", strings.TrimSpace(Operation.StringValue), len(stack))
+				}
 				remaining, lhs, rhs := stack[:len(stack)-2], stack[len(stack)-2], stack[len(stack)-1]
 				newNode.Lhs = lhs
 				newNode.Rhs = rhs
@@ -62,7 +71,7 @@ func (p *pathTreeCreator) CreatePathTree(postFixPath []*Operation) (*PathTreeNod
 		stack = append(stack, &newNode)
 	}
 	if len(stack) != 1 {
-		return nil, fmt.Errorf("expected stack to have 1 thing but its %v", stack)
+		return nil, fmt.Errorf("expected end of expression but found '%v', please check expression syntax", strings.TrimSpace(stack[1].Operation.StringValue))
 	}
 	return stack[0], nil
 }

pkg/yqlib/path_tree_test.go

@@ -0,0 +1,42 @@
+package yqlib
+
+import (
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+func TestPathTreeNoArgsForTwoArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath("=")
+	test.AssertResultComplex(t, "'=' expects 2 args but there is 0", err.Error())
+}
+
+func TestPathTreeOneLhsArgsForTwoArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath(".a =")
+	test.AssertResultComplex(t, "'=' expects 2 args but there is 1", err.Error())
+}
+
+func TestPathTreeOneRhsArgsForTwoArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath("= .a")
+	test.AssertResultComplex(t, "'=' expects 2 args but there is 1", err.Error())
+}
+
+func TestPathTreeTwoArgsForTwoArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath(".a = .b")
+	test.AssertResultComplex(t, nil, err)
+}
+
+func TestPathTreeNoArgsForOneArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath("explode")
+	test.AssertResultComplex(t, "'explode' expects 1 arg but received none", err.Error())
+}
+
+func TestPathTreeOneArgForOneArgOp(t *testing.T) {
+	_, err := treeCreator.ParsePath("explode(.)")
+	test.AssertResultComplex(t, nil, err)
+}
+
+func TestPathTreeExtraArgs(t *testing.T) {
+	_, err := treeCreator.ParsePath("sortKeys(.) explode(.)")
+	test.AssertResultComplex(t, "expected end of expression but found 'explode', please check expression syntax", err.Error())
+}

pkg/yqlib/printer.go

@@ -5,11 +5,12 @@ import (
 	"container/list"
 	"io"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type Printer interface {
 	PrintResults(matchingNodes *list.List) error
+	PrintedAnything() bool
 }
 
 type resultsPrinter struct {
@@ -21,6 +22,8 @@ type resultsPrinter struct {
 	writer             io.Writer
 	firstTimePrinting  bool
 	previousDocIndex   uint
+	previousFileIndex  int
+	printedMatches     bool
 }
 
 func NewPrinter(writer io.Writer, outputToJSON bool, unwrapScalar bool, colorsEnabled bool, indent int, printDocSeparators bool) Printer {
@@ -35,7 +38,14 @@ func NewPrinter(writer io.Writer, outputToJSON bool, unwrapScalar bool, colorsEn
 	}
 }
 
+func (p *resultsPrinter) PrintedAnything() bool {
+	return p.printedMatches
+}
+
 func (p *resultsPrinter) printNode(node *yaml.Node, writer io.Writer) error {
+	p.printedMatches = p.printedMatches || (node.Tag != "!!null" &&
+		(node.Tag != "!!bool" || node.Value != "false"))
+
 	var encoder Encoder
 	if node.Kind == yaml.ScalarNode && p.unwrapScalar && !p.outputToJSON {
 		return p.writeString(writer, node.Value+"\n")
@@ -53,6 +63,13 @@ func (p *resultsPrinter) writeString(writer io.Writer, txt string) error {
 	return errorWriting
 }
 
+func (p *resultsPrinter) safelyFlush(writer *bufio.Writer) {
+	if err := writer.Flush(); err != nil {
+		log.Error("Error flushing writer!")
+		log.Error(err.Error())
+	}
+}
+
 func (p *resultsPrinter) PrintResults(matchingNodes *list.List) error {
 	log.Debug("PrintResults for %v matches", matchingNodes.Len())
 	var err error
@@ -66,26 +83,27 @@ func (p *resultsPrinter) PrintResults(matchingNodes *list.List) error {
 	}
 
 	bufferedWriter := bufio.NewWriter(p.writer)
-	defer safelyFlush(bufferedWriter)
+	defer p.safelyFlush(bufferedWriter)
 
 	if matchingNodes.Len() == 0 {
 		log.Debug("no matching results, nothing to print")
 		return nil
 	}
 	if p.firstTimePrinting {
-		p.previousDocIndex = matchingNodes.Front().Value.(*CandidateNode).Document
+		node := matchingNodes.Front().Value.(*CandidateNode)
+		p.previousDocIndex = node.Document
+		p.previousFileIndex = node.FileIndex
 		p.firstTimePrinting = false
 	}
 
 	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		mappedDoc := el.Value.(*CandidateNode)
 		log.Debug("-- print sep logic: p.firstTimePrinting: %v, previousDocIndex: %v, mappedDoc.Document: %v, printDocSeparators: %v", p.firstTimePrinting, p.previousDocIndex, mappedDoc.Document, p.printDocSeparators)
-		if (p.previousDocIndex != mappedDoc.Document) && p.printDocSeparators {
+		if (p.previousDocIndex != mappedDoc.Document || p.previousFileIndex != mappedDoc.FileIndex) && p.printDocSeparators {
 			log.Debug("-- writing doc sep")
 			if err := p.writeString(bufferedWriter, "---\n"); err != nil {
 				return err
 			}
-
 		}
 
 		if err := p.printNode(mappedDoc.Node, bufferedWriter); err != nil {

pkg/yqlib/printer_test.go

@@ -52,7 +52,53 @@ func TestPrinterMultipleDocsInSequence(t *testing.T) {
 
 	writer.Flush()
 	test.AssertResult(t, multiDocSample, output.String())
+}
 
+func TestPrinterMultipleFilesInSequence(t *testing.T) {
+	var output bytes.Buffer
+	var writer = bufio.NewWriter(&output)
+	printer := NewPrinter(writer, false, true, false, 2, true)
+
+	inputs, err := readDocuments(strings.NewReader(multiDocSample), "sample.yml", 0)
+	if err != nil {
+		panic(err)
+	}
+
+	el := inputs.Front()
+	elNode := el.Value.(*CandidateNode)
+	elNode.Document = 0
+	elNode.FileIndex = 0
+	sample1 := nodeToMap(elNode)
+
+	el = el.Next()
+	elNode = el.Value.(*CandidateNode)
+	elNode.Document = 0
+	elNode.FileIndex = 1
+	sample2 := nodeToMap(elNode)
+
+	el = el.Next()
+	elNode = el.Value.(*CandidateNode)
+	elNode.Document = 0
+	elNode.FileIndex = 2
+	sample3 := nodeToMap(elNode)
+
+	err = printer.PrintResults(sample1)
+	if err != nil {
+		panic(err)
+	}
+
+	err = printer.PrintResults(sample2)
+	if err != nil {
+		panic(err)
+	}
+
+	err = printer.PrintResults(sample3)
+	if err != nil {
+		panic(err)
+	}
+
+	writer.Flush()
+	test.AssertResult(t, multiDocSample, output.String())
 }
 
 func TestPrinterMultipleDocsInSinglePrint(t *testing.T) {