shell completion for kustomize commands

cmd/config/cmd/complete/complete.go

@@ -0,0 +1,68 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package complete
+
+import (
+	"os"
+	"strings"
+
+	"github.com/posener/complete/v2"
+	"github.com/posener/complete/v2/predict"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"sigs.k8s.io/kustomize/cmd/config/cmddocs/commands"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+)
+
+// NewCommand returns a new install-completion command
+func NewCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:     "install-completion",
+		Short:   commands.CompletionShort,
+		Long:    commands.CompletionLong,
+		PreRunE: preRunE,
+		Run:     run,
+	}
+}
+
+func preRunE(cmd *cobra.Command, args []string) error {
+	// install by default
+	if os.Getenv("COMP_INSTALL") == "" {
+		if err := errors.Wrap(os.Setenv("COMP_INSTALL", "1")); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func run(cmd *cobra.Command, args []string) {
+	// find the root command
+	for cmd.Parent() != nil {
+		cmd = cmd.Parent()
+	}
+
+	// do completion
+	Complete(cmd).Complete("kustomize")
+}
+
+// Complete returns a completion command for a cobra command
+func Complete(cmd *cobra.Command) *complete.Command {
+	cc := &complete.Command{
+		Flags: map[string]complete.Predictor{},
+		Sub:   map[string]*complete.Command{},
+	}
+
+	// add completion for each subcommand
+	for i := range cmd.Commands() {
+		c := cmd.Commands()[i]
+		name := strings.Split(c.Use, " ")[0]
+		cc.Sub[name] = Complete(c)
+	}
+
+	// add completion for each flag
+	cmd.Flags().VisitAll(func(flag *pflag.Flag) {
+		cc.Flags[flag.Name] = predict.Nothing
+	})
+	return cc
+}

cmd/config/cmddocs/commands/docs.go

@@ -21,6 +21,23 @@ var CatExamples = `
     # unwrap Resource config from a directory in an ResourceList
     ... | kustomize config cat`
 
+var CompletionShort = `Install shell completion.`
+var CompletionLong = `
+Install shell completion for kustomize commands and flags -- supports bash, fish and zsh.
+
+    kustomize install-completion
+
+Registers the completion command with known shells (e.g. .bashrc, .bash_profile, etc):
+
+    complete -C /Users/USER/go/bin/kustomize kustomize
+
+Because the completion command is embedded in kustomize directly, there is no need to update
+it separately from the kustomize binary.
+
+To uninstall shell completion run:
+
+    COMP_UNINSTALL=1 kustomize install-completion`
+
 var CountShort = `[Alpha] Count Resources Config from a local directory.`
 var CountLong = `
 [Alpha] Count Resources Config from a local directory.
@@ -123,7 +140,7 @@ var RunFnsShort = `[Alpha] Reoncile config functions to Resources.`
 var RunFnsLong = `
 [Alpha] Reconcile config functions to Resources.
 
-run sequentially invokes all config functions in the directly, providing Resources
+run sequentially invokes all config functions in the directory, providing Resources
 in the directory as input to the first function, and writing the output of the last
 function back to the directory.
 
@@ -140,7 +157,7 @@ order they appear in the file).
 #### Config Functions:
 
   Config functions are specified as Kubernetes types containing a metadata.configFn.container.image
-  field.  This fields tells run how to invoke the container.
+  field.  This field tells run how to invoke the container.
 
   Example config function:
 
@@ -160,7 +177,7 @@ order they appear in the file).
   In the preceding example, 'kustomize config run example/' would identify the function by
   the metadata.configFn field.  It would then write all Resources in the directory to
   a container stdin (running the gcr.io/example/examplefunction:v1.0.1 image).  It
-  would then writer the container stdout back to example/, replacing the directory
+  would then write the container stdout back to example/, replacing the directory
   file contents.
 
   See ` + "`" + `kustomize config help docs-fn` + "`" + ` for more details on writing functions.

cmd/config/docs/commands/completion.md

@@ -0,0 +1,20 @@
+## install-completion
+
+Install shell completion.
+
+### Synopsis
+
+Install shell completion for kustomize commands and flags -- supports bash, fish and zsh.
+
+    kustomize install-completion
+
+Registers the completion command with known shells (e.g. .bashrc, .bash_profile, etc):
+
+    complete -C /Users/USER/go/bin/kustomize kustomize
+
+Because the completion command is embedded in kustomize directly, there is no need to update
+it separately from the kustomize binary.
+
+To uninstall shell completion run:
+
+    COMP_UNINSTALL=1 kustomize install-completion

cmd/config/go.mod

@@ -4,8 +4,9 @@ go 1.13
 
 require (
 	github.com/go-errors/errors v1.0.1
+	github.com/posener/complete/v2 v2.0.1-alpha.12
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.4.0
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.0.0

cmd/config/go.sum

@@ -54,6 +54,10 @@ github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTVRp3pOg5EKY=
 github.com/gophercloud/gophercloud v0.6.0/go.mod h1:GICNByuaEBibcjmjvI7QvYJSZEbGkcYwAR7EZK2WMqM=
 github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v1.0.0 h1:iVjPR7a6H0tWELX5NxNe7bYopibicUzc7uPribsnS6o=
+github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHhCYQXV3UM06sGGrk=
 github.com/hashicorp/golang-lru v0.5.3/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
@@ -94,6 +98,10 @@ github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/posener/complete/v2 v2.0.1-alpha.12 h1:0wvkuDfHb5vSZlNBYgpEH4XQHpF46MjLPHav8XC77Nc=
+github.com/posener/complete/v2 v2.0.1-alpha.12/go.mod h1://JlL91cS2JV7rOl6LVHrRqBXoBUecJu3ILQPgbJiMQ=
+github.com/posener/script v1.0.4 h1:nSuXW5ZdmFnQIueLB2s0qvs4oNsUloM1Zydzh75v42w=
+github.com/posener/script v1.0.4/go.mod h1:Rg3ijooqulo05aGLyGsHoLmIOUzHUVK19WVgrYBPU/E=
 github.com/rogpeppe/go-charset v0.0.0-20180617210344-2471d30d28b4/go.mod h1:qgYeAmZ5ZIpBWTGllZSQnw97Dj+woV0toclVaRGI8pc=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=