Use Cobra for shell completion

cmd/config/complete/complete.go

@@ -1,72 +0,0 @@
-// 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/internal/generateddocs/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{},
-	}
-	if strings.Contains(cmd.Use, "DIR") {
-		// if usage contains directory, then use a file predictor
-		cc.Args = predict.Dirs("*")
-	}
-
-	// 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/completion/completion.go

@@ -0,0 +1,33 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package completion
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func NewCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:                   "completion [bash|zsh|fish|powershell]",
+		Short:                 "Generate shell completion script",
+		Long:                  "Generate shell completion.",
+		DisableFlagsInUseLine: true,
+		ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+		Args:                  cobra.ExactValidArgs(1),
+		Run: func(cmd *cobra.Command, args []string) {
+			switch args[0] {
+			case "bash":
+				cmd.Root().GenBashCompletion(os.Stdout)
+			case "zsh":
+				cmd.Root().GenZshCompletion(os.Stdout)
+			case "fish":
+				cmd.Root().GenFishCompletion(os.Stdout, true)
+			case "powershell":
+				cmd.Root().GenPowerShellCompletion(os.Stdout)
+			}
+		},
+	}
+}

cmd/config/docs/commands/completion.md

@@ -1,20 +1,25 @@
-## install-completion
+## completion
 
-Install shell completion.
+Generate shell completion.
 
 ### Synopsis
 
-Install shell completion for kustomize commands and flags -- supports bash, fish and zsh.
+Generate shell completion for `kustomize` -- supports bash, zsh, fish and powershell.
 
-    kustomize install-completion
+### Examples
 
-Registers the completion command with known shells (e.g. .bashrc, .bash_profile, etc):
+    # load completion for Bash
+    source <(kustomize completion bash)
 
-    complete -C /Users/USER/go/bin/kustomize kustomize
+    # install for Bash in Linux
+    kustomize completion bash > /etc/bash_completion.d/kustomize
 
-Because the completion command is embedded in kustomize directly, there is no need to update
-it separately from the kustomize binary.
+    # install for Bash in MacOS
+    kustomize completion bash > /usr/local/etc/bash_completion.d/kustomize
 
-To uninstall shell completion run:
+    # package for Bash
+    kustomize completion bash > /usr/share/bash-completion/completions/kustomize
+
+    # package for zsh
+    kustomize completion zsh > /usr/share/zsh/site-functions/_kustomize
 
-    COMP_UNINSTALL=1 kustomize install-completion

cmd/config/go.mod

@@ -9,7 +9,6 @@ require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/olekukonko/tablewriter v0.0.4
-	github.com/posener/complete/v2 v2.0.1-alpha.12
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.6.1

cmd/config/go.sum

@@ -230,10 +230,6 @@ 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/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=