cmd: Added shell completion command

src/cmd/completion.go

@@ -0,0 +1,91 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/containers/toolbox/pkg/utils"
+	"github.com/spf13/cobra"
+)
+
+var completionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion script",
+	Long: `To load completions:
+
+Bash:
+
+  $ source <(toolbox completion bash)
+
+  # To load completions for each session, execute once:
+  # Linux:
+  $ toolbox completion bash > /etc/bash_completion.d/toolbox
+  # macOS:
+  $ toolbox completion bash > /usr/local/etc/bash_completion.d/toolbox
+
+Zsh:
+
+  # If shell completion is not already enabled in your environment,
+  # you will need to enable it.  You can execute the following once:
+
+  $ echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+  # To load completions for each session, execute once:
+  $ toolbox completion zsh > "${fpath[1]}/_toolbox"
+
+  # You will need to start a new shell for this setup to take effect.
+
+fish:
+
+  $ toolbox completion fish | source
+
+  # To load completions for each session, execute once:
+  $ toolbox completion fish > ~/.config/fish/completions/toolbox.fish
+
+`,
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish"},
+	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)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(completionCmd)
+}
+
+func getDistroCompletionNames() []string {
+	distros := []string{}
+	supported_distros := utils.GetSupportedDistros()
+	for key, _ := range supported_distros {
+		distros = append(distros, key)
+	}
+	return distros
+}
+
+func getImageCompletionNames() []string {
+	var image_names []string
+	if images, err := getImages(); err == nil {
+		for _, image := range images {
+			image_names = append(image_names, image.Names[0])
+		}
+	}
+	return image_names
+}
+
+func getContainerCompletionNames() []string {
+	container_names := []string{}
+	if containers, err := getContainers(); err == nil {
+		for _, container := range containers {
+			container_names = append(container_names, container.Names[0])
+		}
+	}
+	return container_names
+}

src/cmd/create.go

@@ -91,6 +91,24 @@ func init() {
 		"Create a toolbox container for a different operating system release than the host")
 
 	createCmd.SetHelpFunc(createHelp)
+
+	createCmd.RegisterFlagCompletionFunc(
+		"distro",
+		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			return getDistroCompletionNames(), cobra.ShellCompDirectiveNoFileComp
+		})
+
+	createCmd.RegisterFlagCompletionFunc(
+		"image",
+		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			// TODO: Create completion depending on args. If the distro arg is present return empty as
+			// distro and image arguments can't be used together
+
+			// TODO: Else, get the list of images available for toolbox locally
+
+			return getImageCompletionNames(), cobra.ShellCompDirectiveNoFileComp
+		})
+
 	rootCmd.AddCommand(createCmd)
 }
 

src/cmd/run.go

@@ -70,6 +70,13 @@ func init() {
 		"Run command inside a toolbox container for a different operating system release than the host")
 
 	runCmd.SetHelpFunc(runHelp)
+
+	runCmd.RegisterFlagCompletionFunc(
+		"container",
+		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			return getContainerCompletionNames(), cobra.ShellCompDirectiveNoFileComp
+		})
+
 	rootCmd.AddCommand(runCmd)
 }
 

src/meson.build

@@ -5,6 +5,7 @@ go_build_wrapper_program = find_program('go-build-wrapper')
 
 sources = files(
   'toolbox.go',
+  'cmd/completion.go',
   'cmd/create.go',
   'cmd/enter.go',
   'cmd/help.go',

src/pkg/utils/utils.go

@@ -762,3 +762,7 @@ func ShowManual(manual string) error {
 
 	return nil
 }
+
+func GetSupportedDistros() map[string]Distro {
+	return supportedDistros
+}