Updating readme for imminent v4 release

README.md

@@ -25,16 +25,16 @@ snap install yq
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:
 
 ```
-sudo cat /etc/myfile | yq 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
 ```
@@ -48,7 +48,7 @@ wget https://github.com/mikefarah/yq/releases/download/{VERSION}/{BINARY} -O /us
     chmod +x /usr/bin/yq
 ```
 
-For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
+For instance, VERSION=4.0.0 and BINARY=yq_linux_amd64
 
 
 ### Run with Docker
@@ -56,7 +56,7 @@ For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
 #### 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:
@@ -69,13 +69,13 @@ 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/v4
 ```
 
 ## Community Supported Installation methods
@@ -108,22 +108,18 @@ 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)
+- Uses similar syntax as `jq` but works with YAML and JSON files
-- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/commands/read#basic)
+- Fully supports multi document yaml files
-- [List matching paths of a given path expression](https://mikefarah.gitbook.io/yq/commands/read#path-only)
+- Colorized yaml output
-- [Return the lengths of arrays/object/scalars](https://mikefarah.gitbook.io/yq/commands/read#printing-length-of-the-results)
+- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
-- 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)
+- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/v/v4.x/sort-keys)
-- Update creates any missing entries in the path on the fly
+- Manipulate yaml [comments](https://app.gitbook.com/@mikefarah/s/yq/v/v4.x/comment-operators), [styling](https://app.gitbook.com/@mikefarah/s/yq/v/v4.x/style), [tags](https://app.gitbook.com/@mikefarah/s/yq/v/v4.x/tag) and [anchors](https://app.gitbook.com/@mikefarah/s/yq/v/v4.x/explode).
-- Deeply [compare](https://mikefarah.gitbook.io/yq/commands/compare) yaml files
+- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
-- Keeps yaml formatting and comments when updating
+- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/v/v4.x/select#select-and-update-matching-values-in-map)
-- [Validate a yaml file](https://mikefarah.gitbook.io/yq/commands/validate)
+- Keeps yaml formatting and comments when updating (though there are issues with whitespace)
-- 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)
+- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
-- [Prefix a path to a yaml file](https://mikefarah.gitbook.io/yq/commands/prefix)
+- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
-- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/usage/convert)
+- General shell completion scripts (bash/zsh/fish/powershell) (https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
-- [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)
 
 ## [Usage](https://mikefarah.gitbook.io/yq/)
 
@@ -135,32 +131,35 @@ Usage:
   yq [command]
 
 Available Commands:
-  compare          yq x [--prettyPrint/-P] dataA.yaml dataB.yaml 'b.e(name==fr*).value'
+  eval             Apply expression to each document in each yaml file given in sequence
-  delete           yq d [--inplace/-i] [--doc/-d index] sample.yaml 'b.e(name==fred)'
+  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
+  shell-completion Generate completion script
-  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
 
 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
+  -i, --inplace       update the yaml file inplace of first yaml file given.
-  -j, --tojson        output as json. By default it prints a json document in one line, use the prettyPrint flag to print a formatted doc.
+  -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.
+  -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
+Simple Example:
-If you've been using v2 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/upgrading-from-v2).
+
+```bash
+yq e '.a.b | length' f1.yml f2.yml 
+```
+
+## Upgrade from V3
+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).
 
 ## 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
@@ -15,4 +15,4 @@ var nullInput = false
 var verbose = false
 var version = 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
+# merges f2.yml into f1.yml (inplace)
-yq es < sample.yaml
+yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
-yq es -n '{"a": "b"}'
 `,
 		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
@@ -39,7 +41,26 @@ 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) }()
+	}
+
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
+
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 	switch len(args) {
 	case 0:
@@ -51,7 +72,7 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		}
 	case 1:
 		if nullInput {
-			err = allAtOnceEvaluator.EvaluateFiles(args[0], []string{}, printer)
+			err = yqlib.NewStreamEvaluator().EvaluateNew(args[0], printer)
 		} else {
 			err = allAtOnceEvaluator.EvaluateFiles("", []string{args[0]}, printer)
 		}
@@ -59,6 +80,11 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		err = allAtOnceEvaluator.EvaluateFiles(args[0], args[1:], printer)
 	}
 
-	cmd.SilenceUsage = true
+	completedSuccessfully = err == nil
+
+	if err == nil && exitStatus && !printer.PrintedAnything() {
+		return errors.New("no matches found")
+	}
+
 	return err
 }

cmd/evalute_sequence_command.go

@@ -1,6 +1,8 @@
 package cmd
 
 import (
+	"errors"
+	"fmt"
 	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -13,9 +15,18 @@ 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
+# runs the expression against each file, in series
-yq es < sample.yaml
+yq e '.a.b | length' f1.yml f2.yml 
-yq es -n '{"a": "b"}'
+
+# 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,
@@ -23,6 +34,7 @@ yq es -n '{"a": "b"}'
 	return cmdEvalSequence
 }
 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
@@ -39,10 +51,27 @@ 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()
 
 	switch len(args) {
 	case 0:
@@ -54,14 +83,18 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		}
 	case 1:
 		if nullInput {
-			err = allAtOnceEvaluator.EvaluateFiles(args[0], []string{}, printer)
+			err = streamEvaluator.EvaluateNew(args[0], printer)
 		} else {
 			err = streamEvaluator.EvaluateFiles("", []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 +46,8 @@ 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(&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 = "4.0.0-beta1"
 
 	// 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)
-// }

go.mod

@@ -6,8 +6,7 @@ require (
 	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/cobra v1.1.1
-	github.com/spf13/pflag v1.0.5 // indirect
 	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

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/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
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@@ -26,6 +43,7 @@ github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
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@@ -39,20 +57,54 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
+google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
+google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.13.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
+google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v9 v9.30.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
@@ -183,6 +331,13 @@ 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.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 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/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/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/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
@@ -100,7 +112,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.[] | select(. == "apple") |= "frog"' sample.yml
+yq eval '(.a.[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -118,7 +130,7 @@ 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 +160,7 @@ 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/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/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/Traverse.md

@@ -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

pkg/yqlib/doc/headers/Add.md

@@ -2,3 +2,5 @@ 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`.

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.
+
+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/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
@@ -17,19 +19,18 @@ type OperationType struct {
 }
 
 // operators TODO:
-// - write in place
+// - cookbook doc for common things
-// - mergeAppend (merges and appends arrays)
 // - 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}
@@ -41,7 +42,8 @@ var Add = &OperationType{Type: "ADD", NumArgs: 2, Precedence: 45, Handler: AddOp
 
 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}
@@ -54,6 +56,7 @@ var GetFileIndex = &OperationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence
 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}
@@ -70,9 +73,6 @@ var Select = &OperationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler:
 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
-
 type Operation struct {
 	OperationType *OperationType
 	Value         interface{}

pkg/yqlib/operator_add.go

@@ -8,6 +8,20 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
+func createSelfAddOp(rhs *PathTreeNode) *PathTreeNode {
+	return &PathTreeNode{Operation: &Operation{OperationType: Add},
+		Lhs: &PathTreeNode{Operation: &Operation{OperationType: SelfReference}},
+		Rhs: rhs}
+}
+
+func AddAssignOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	assignmentOp := &Operation{OperationType: Assign}
+	assignmentOp.Preferences = &AssignOpPreferences{true}
+
+	assignmentOpNode := &PathTreeNode{Operation: assignmentOp, Lhs: pathNode.Lhs, Rhs: createSelfAddOp(pathNode.Rhs)}
+	return d.GetMatchingNodes(matchingNodes, assignmentOpNode)
+}
+
 func toNodes(candidates *list.List) []*yaml.Node {
 
 	if candidates.Len() == 0 {
@@ -45,7 +59,7 @@ func AddOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathT
 		lhsCandidate := el.Value.(*CandidateNode)
 		lhsNode := UnwrapDoc(lhsCandidate.Node)
 
-		var newBlank = &CandidateNode{
+		target := &CandidateNode{
 			Path:     lhsCandidate.Path,
 			Document: lhsCandidate.Document,
 			Filename: lhsCandidate.Filename,
@@ -56,11 +70,11 @@ func AddOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathT
 		case yaml.MappingNode:
 			return nil, fmt.Errorf("Maps not yet supported for addition")
 		case yaml.SequenceNode:
-			newBlank.Node.Kind = yaml.SequenceNode
+			target.Node.Kind = yaml.SequenceNode
-			newBlank.Node.Style = lhsNode.Style
+			target.Node.Style = lhsNode.Style
-			newBlank.Node.Tag = "!!seq"
+			target.Node.Tag = "!!seq"
-			newBlank.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
+			target.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
-			results.PushBack(newBlank)
+			results.PushBack(target)
 		case yaml.ScalarNode:
 			return nil, fmt.Errorf("Scalars not yet supported for addition")
 		}

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]}`,

pkg/yqlib/operator_assign.go

@@ -36,6 +36,11 @@ func AssignUpdateOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNo
 			candidate.UpdateFrom(first.Value.(*CandidateNode))
 		}
 	}
+	// // 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}}}`,
@@ -73,7 +80,7 @@ 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",
 		},
@@ -81,7 +88,7 @@ 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 +106,7 @@ 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 +114,7 @@ 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_collect_object.go

@@ -94,7 +94,7 @@ 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_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_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

@@ -43,17 +43,24 @@ func crossFunction(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	return results, nil
 }
 
-func MultiplyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+type MultiplyPreferences struct {
-	log.Debugf("-- MultiplyOperator")
+	AppendArrays bool
-	return crossFunction(d, matchingNodes, pathNode, multiply)
 }
 
-func multiply(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+func MultiplyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- MultiplyOperator")
+	return crossFunction(d, matchingNodes, pathNode, multiply(pathNode.Operation.Preferences.(*MultiplyPreferences)))
+}
+
+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)
 
+		shouldAppendArrays := preferences.AppendArrays
+
 		if lhs.Node.Kind == yaml.MappingNode && rhs.Node.Kind == yaml.MappingNode ||
 			(lhs.Node.Kind == yaml.SequenceNode && rhs.Node.Kind == yaml.SequenceNode) {
 
@@ -63,19 +70,22 @@ func multiply(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*Ca
 				Filename: lhs.Filename,
 				Node:     &yaml.Node{},
 			}
-		var newThing, err = mergeObjects(d, newBlank, lhs)
+			var newThing, err = mergeObjects(d, newBlank, lhs, false)
 			if err != nil {
 				return nil, err
 			}
-		return mergeObjects(d, newThing, rhs)
+			return mergeObjects(d, newThing, rhs, shouldAppendArrays)
 
 		}
 		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
+	err := recursiveDecent(d, results, nodeToMap(rhs), !shouldAppendArrays)
 	if err != nil {
 		return nil, err
 	}
@@ -86,7 +96,7 @@ 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
 		}
@@ -101,13 +111,14 @@ func createTraversalTree(path []interface{}) *PathTreeNode {
 		return &PathTreeNode{Operation: &Operation{OperationType: TraversePath, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}}
 	}
 	return &PathTreeNode{
-		Operation: &Operation{OperationType: Pipe},
+		Operation: &Operation{OperationType: ShortPipe},
 		Lhs:       createTraversalTree(path[0:1]),
 		Rhs:       createTraversalTree(path[1:])}
 
 }
 
-func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode) error {
+func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode, shouldAppendArrays bool) error {
+
 	log.Debugf("merge - applyAssignment lhs %v, rhs: %v", NodeToString(lhs), NodeToString(rhs))
 
 	lhsPath := rhs.Path[pathIndexToStartFrom:]
@@ -116,6 +127,8 @@ func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *Candid
 	if rhs.Node.Kind == yaml.ScalarNode || rhs.Node.Kind == yaml.AliasNode {
 		assignmentOp.OperationType = Assign
 		assignmentOp.Preferences = &AssignOpPreferences{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 +13,14 @@ var pathOperatorScenarios = []expressionScenario{
 			"D0, P[a b], (!!seq)::- a\n- b\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 +29,14 @@ 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 +3,13 @@ package yqlib
 import (
 	"container/list"
 
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )
 
 func RecursiveDescentOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	var results = list.New()
 
-	err := recursiveDecent(d, results, matchMap)
+	err := recursiveDecent(d, results, matchMap, true)
 	if err != nil {
 		return nil, err
 	}
@@ -17,7 +17,7 @@ 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, recurseArray bool) error {
 	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 
@@ -26,14 +26,15 @@ 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 &&
+			(recurseArray || candidate.Node.Kind != yaml.SequenceNode) {
 
 			children, err := Splat(d, nodeToMap(candidate))
 
 			if err != nil {
 				return err
 			}
-			err = recursiveDecent(d, results, children)
+			err = recursiveDecent(d, results, children, recurseArray)
 			if err != nil {
 				return err
 			}

pkg/yqlib/operator_recursive_descent_test.go

@@ -5,6 +5,22 @@ import (
 )
 
 var recursiveDescentOperatorScenarios = []expressionScenario{
+	{
+		skipDoc:    true,
+		document:   `{}`,
+		expression: `..`,
+		expected: []string{
+			"D0, P[], (!!map)::{}\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[]`,
+		expression: `..`,
+		expected: []string{
+			"D0, P[], (!!seq)::[]\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `cat`,

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_traverse_path_test.go

@@ -159,7 +159,7 @@ var traversePathOperatorScenarios = []expressionScenario{
 	{
 		description: "Traversing arrays by index",
 		document:    `[1,2,3]`,
-		expression:  `[0]`,
+		expression:  `.[0]`,
 		expected: []string{
 			"D0, P[0], (!!int)::1\n",
 		},
@@ -167,7 +167,7 @@ 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 +175,7 @@ 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",
 		},

pkg/yqlib/operators.go

@@ -2,7 +2,6 @@ package yqlib
 
 import (
 	"container/list"
-	"fmt"
 
 	"gopkg.in/yaml.v3"
 )
@@ -20,14 +19,6 @@ 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 {
@@ -42,29 +33,3 @@ func nodeToMap(candidate *CandidateNode) *list.List {
 	elMap.PushBack(candidate)
 	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)
-	}
-
-	return results, nil
-}

pkg/yqlib/operators_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/mikefarah/yq/v4/test"
+	yaml "gopkg.in/yaml.v3"
 )
 
 type expressionScenario struct {
@@ -37,9 +38,18 @@ 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)
 			return
 		}
+	} else {
+		candidateNode := &CandidateNode{
+			Document:  0,
+			Filename:  "",
+			Node:      &yaml.Node{Tag: "!!null"},
+			FileIndex: 0,
+		}
+		inputs.PushBack(candidateNode)
+
 	}
 
 	results, err = treeNavigator.GetMatchingNodes(inputs, node)
@@ -152,20 +162,20 @@ func documentScenarios(t *testing.T, title string, scenarios []expressionScenari
 			var output bytes.Buffer
 			var err error
 			printer := NewPrinter(bufio.NewWriter(&output), false, true, false, 2, true)
+			streamEvaluator := NewStreamEvaluator()
 
 			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 = streamEvaluator.EvaluateNew(s.expression, printer)
-				err = allAtOnceEvaluator.EvaluateFiles(s.expression, []string{}, printer)
 				if err != nil {
 					t.Error(err)
 				}

pkg/yqlib/path_parse_test.go

@@ -11,53 +11,46 @@ 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"),
+	},
+	{
+		`.a[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]"),
+		append(make([]interface{}, 0), "a", "[]", "SHORT_PIPE"),
+	},
+	{
+		`.a.[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]"),
+		append(make([]interface{}, 0), "a", "[]", "SHORT_PIPE"),
+	},
+	{
+		`.a[].c`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]", "SHORT_PIPE", "c"),
+		append(make([]interface{}, 0), "a", "[]", "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", "SHORT_PIPE", "a"),
-		append(make([]interface{}, 0), "d0", "a", "PIPE"),
+		append(make([]interface{}, 0), "d0", "a", "SHORT_PIPE"),
 	},
 	{
-		`.a | (.[].b == "apple")`,
+		`.a | .[].b == "apple"`,
-		append(make([]interface{}, 0), "a", "PIPE", "(", "[]", "PIPE", "b", "EQUALS", "apple (string)", ")"),
+		append(make([]interface{}, 0), "a", "PIPE", "[]", "SHORT_PIPE", "b", "EQUALS", "apple (string)"),
-		append(make([]interface{}, 0), "a", "[]", "b", "PIPE", "apple (string)", "EQUALS", "PIPE"),
+		append(make([]interface{}, 0), "a", "[]", "b", "SHORT_PIPE", "apple (string)", "EQUALS", "PIPE"),
+	},
+	{
+		`(.a | .[].b) == "apple"`,
+		append(make([]interface{}, 0), "(", "a", "PIPE", "[]", "SHORT_PIPE", "b", ")", "EQUALS", "apple (string)"),
+		append(make([]interface{}, 0), "a", "[]", "b", "SHORT_PIPE", "PIPE", "apple (string)", "EQUALS"),
 	},
 	{
 		`.[] | select(. == "*at")`,
@@ -67,12 +60,12 @@ var pathTests = []struct {
 	{
 		`[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 +80,27 @@ 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", "CREATE_MAP", "c", "UNION", "b", "SHORT_PIPE", "[]", "CREATE_MAP", "f", "SHORT_PIPE", "g", "SHORT_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", "c", "CREATE_MAP", "b", "[]", "SHORT_PIPE", "f", "g", "SHORT_PIPE", "[]", "SHORT_PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
 	{
 		`explode(.a.b)`,
-		append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
+		append(make([]interface{}, 0), "EXPLODE", "(", "a", "SHORT_PIPE", "b", ")"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
+		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", "SHORT_PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "folded (string)", "ASSIGN_STYLE"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "folded (string)", "ASSIGN_STYLE"),
 	},
 	{
 		`tag == "str"`,
@@ -130,11 +123,11 @@ var pathTests = []struct {
 		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
 	},
 
-	// {
+	{
-	// 	`.a.b tag="!!str"`,
+		`.a.b tag="!!str"`,
-	// 	append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_TAG", "!!str (string)"),
-	// 	append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "!!str (string)", "ASSIGN_TAG"),
-	// },
+	},
 	{
 		`""`,
 		append(make([]interface{}, 0), " (string)"),
@@ -148,27 +141,8 @@ 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
+	SplatOrEmptyCollect
 )
 
 type Token struct {
@@ -47,6 +49,8 @@ func (t *Token) toString() string {
 		return "{"
 	} else if t.TokenType == CloseCollectObject {
 		return "}"
+	} else if t.TokenType == SplatOrEmptyCollect {
+		return "[]?"
 	} else {
 		return "NFI"
 	}
@@ -190,6 +194,7 @@ func initLexer() (*lex.Lexer, error) {
 	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))
@@ -223,7 +228,6 @@ func initLexer() (*lex.Lexer, error) {
 
 	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("( |\t|\n|\r)+"), skip)
@@ -247,12 +251,16 @@ func initLexer() (*lex.Lexer, error) {
 
 	lexer.Add([]byte(`"[^ "]*"`), stringValue(true))
 
+	lexer.Add([]byte(`\[\]`), literalToken(SplatOrEmptyCollect, 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 +289,7 @@ 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() {
@@ -292,17 +300,46 @@ 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 {
+			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 == SplatOrEmptyCollect {
+		if index > 0 && tokens[index-1].TokenType == OperationToken &&
+			tokens[index-1].Operation.OperationType == TraversePath {
+			// must be a splat without a preceding dot , e.g. .a[]
+			// lets put a pipe in front of it, and convert it to a traverse "[]" token
+			pipeOp := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+
+			postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: pipeOp})
+
+			traverseOp := &Operation{OperationType: TraversePath, Value: "[]", StringValue: "[]"}
+			token = &Token{TokenType: OperationToken, Operation: traverseOp, CheckForPostTraverse: true}
+
+		} else {
+			// gotta be a collect empty array, we need to split this into two tokens
+			// one OpenCollect, the other CloseCollect
+			postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OpenCollect})
+			token = &Token{TokenType: CloseCollect, CheckForPostTraverse: true}
+		}
+	}
 
 	if index != len(tokens)-1 && token.AssignOperation != nil &&
 		tokens[index+1].TokenType == OperationToken &&
@@ -316,11 +353,8 @@ func (p *pathTokeniser) Tokenise(path string) ([]*Token, error) {
 	if index != len(tokens)-1 && token.CheckForPostTraverse &&
 		tokens[index+1].TokenType == OperationToken &&
 		tokens[index+1].Operation.OperationType == TraversePath {
-				op := &Operation{OperationType: Pipe, Value: "PIPE"}
+		op := &Operation{OperationType: ShortPipe, Value: "PIPE"}
 		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
 	}
-		}
+	return postProcessedTokens, skipNextToken
-	}
-
-	return postProcessedTokens, nil
 }

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) {

pkg/yqlib/stream_evaluator.go

@@ -11,6 +11,7 @@ import (
 type StreamEvaluator interface {
 	Evaluate(filename string, reader io.Reader, node *PathTreeNode, printer Printer) error
 	EvaluateFiles(expression string, filenames []string, printer Printer) error
+	EvaluateNew(expression string, printer Printer) error
 }
 
 type streamEvaluator struct {
@@ -23,6 +24,27 @@ func NewStreamEvaluator() StreamEvaluator {
 	return &streamEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewPathTreeCreator()}
 }
 
+func (s *streamEvaluator) EvaluateNew(expression string, printer Printer) error {
+	node, err := treeCreator.ParsePath(expression)
+	if err != nil {
+		return err
+	}
+	candidateNode := &CandidateNode{
+		Document:  0,
+		Filename:  "",
+		Node:      &yaml.Node{Tag: "!!null"},
+		FileIndex: 0,
+	}
+	inputList := list.New()
+	inputList.PushBack(candidateNode)
+
+	matches, errorParsing := treeNavigator.GetMatchingNodes(inputList, node)
+	if errorParsing != nil {
+		return errorParsing
+	}
+	return printer.PrintResults(matches)
+}
+
 func (s *streamEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer) error {
 
 	node, err := treeCreator.ParsePath(expression)

pkg/yqlib/utils.go

@@ -9,8 +9,6 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
-//TODO: convert to interface + struct
-
 var treeNavigator = NewDataTreeNavigator()
 var treeCreator = NewPathTreeCreator()
 
@@ -52,54 +50,3 @@ func readDocuments(reader io.Reader, filename string, fileIndex int) (*list.List
 		currentIndex = currentIndex + 1
 	}
 }
-
-// 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 safelyFlush(writer *bufio.Writer) {
-	if err := writer.Flush(); err != nil {
-		log.Error("Error flushing writer!")
-		log.Error(err.Error())
-	}
-
-}
-func safelyCloseFile(file *os.File) {
-	err := file.Close()
-	if err != nil {
-		log.Error("Error closing file!")
-		log.Error(err.Error())
-	}
-}

pkg/yqlib/write_in_place_handler.go

@@ -0,0 +1,59 @@
+package yqlib
+
+import (
+	"io/ioutil"
+	"os"
+)
+
+type WriteInPlaceHandler interface {
+	CreateTempFile() (*os.File, error)
+	FinishWriteInPlace(evaluatedSuccessfully bool)
+}
+
+type writeInPlaceHandler struct {
+	inputFilename string
+	tempFile      *os.File
+}
+
+func NewWriteInPlaceHandler(inputFile string) WriteInPlaceHandler {
+
+	return &writeInPlaceHandler{inputFile, nil}
+}
+
+func (w *writeInPlaceHandler) CreateTempFile() (*os.File, error) {
+	info, err := os.Stat(w.inputFilename)
+	if err != nil {
+		return nil, err
+	}
+	_, err = os.Stat(os.TempDir())
+	if os.IsNotExist(err) {
+		err = os.Mkdir(os.TempDir(), 0700)
+		if err != nil {
+			return nil, err
+		}
+	} else if err != nil {
+		return nil, err
+	}
+
+	file, err := ioutil.TempFile("", "temp")
+	if err != nil {
+		return nil, err
+	}
+
+	err = os.Chmod(file.Name(), info.Mode())
+	log.Debug("writing to tempfile: %v", file.Name())
+	w.tempFile = file
+	return file, err
+}
+
+func (w *writeInPlaceHandler) FinishWriteInPlace(evaluatedSuccessfully bool) {
+	log.Debug("Going to write-inplace, evaluatedSuccessfully=%v, target=%v", evaluatedSuccessfully, w.inputFilename)
+	safelyCloseFile(w.tempFile)
+	if evaluatedSuccessfully {
+		log.Debug("moved temp file to target")
+		safelyRenameFile(w.tempFile.Name(), w.inputFilename)
+	} else {
+		log.Debug("removed temp file")
+		os.Remove(w.tempFile.Name())
+	}
+}

scripts/acceptance.sh

@@ -3,10 +3,62 @@
 set -e
 
 # acceptance test
-X=$(./yq e '.b.c |= 3' ./examples/sample.yaml | ./yq e '.b.c' -)
 
-if [[ $X != 3 ]]; then
+
-  echo "Failed acceptance test: expected 3 but was $X"
+
+echo "test eval-sequence"
+random=$((1 + $RANDOM % 10))
+./yq e -n ".a = $random" > test.yml
+X=$(./yq e '.a' test.yml)
+
+if [[ $X != $random ]]; then
+  echo "Failed create: expected $random but was $X"
   exit 1
 fi
+
+echo "--success"
+
+echo "test update-in-place"
+
+update=$(($random + 1))
+./yq e -i ".a = $update" test.yml
+
+X=$(./yq e '.a' test.yml)
+if [[ $X != $update ]]; then
+  echo "Failed to update inplace test: expected $update but was $X"
+  exit 1
+fi
+
+echo "--success"
+
+echo "test eval-all"
+./yq ea -n ".a = $random" > test-eval-all.yml
+Y=$(./yq ea '.a' test-eval-all.yml)
+
+if [[ $Y != $random ]]; then
+  echo "Failed create with eval all: expected $random but was $X"
+  exit 1
+fi
+echo "--success"
+
+echo "test no exit status"
+./yq e '.z' test.yml
+echo "--success"
+
+echo "test exit status"
+set +e
+
+./yq e -e '.z' test.yml
+
+if [[ $? != 1 ]]; then
+  echo "Expected error code 1 but was $?"
+  exit 1
+fi
+
+echo "--success"
+
+set -e
+
+rm test.yml
+rm test-eval-all.yml
 echo "acceptance tests passed"

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: yq
-version: '4.0.0-alpha2'
+version: '4.0.0-beta1'
 summary: A lightweight and portable command-line YAML processor
 description: |
   The aim of the project is to be the jq or sed of yaml files.