add autocompletion

cmd/hauler/cli/cli.go

@@ -35,6 +35,7 @@ func New() *cobra.Command {
 	addStore(cmd)
 	addServe(cmd)
 	addVersion(cmd)
+	addCompletion(cmd)
 
 	return cmd
 }

cmd/hauler/cli/completion.go

@@ -0,0 +1,123 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"github.com/spf13/cobra"
+)
+
+func addCompletion(parent *cobra.Command) {
+	cmd := &cobra.Command{
+		Use:     "completion",
+		Short:   "Generates completion scripts for various shells",
+		Long:  `The completion sub-command generates completion scripts for various shells.`,
+	}
+
+	cmd.AddCommand(
+		addCompletionZsh(),
+		addCompletionBash(),
+		addCompletionFish(),
+		addCompletionPowershell(),
+	)
+
+	parent.AddCommand(cmd)
+}
+
+func completionError(err error) ([]string, cobra.ShellCompDirective) {
+	cobra.CompError(err.Error())
+	return nil, cobra.ShellCompDirectiveError
+}
+
+func addCompletionZsh() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "zsh",
+		Short: "Generates zsh completion scripts",
+		Long:  `The completion sub-command generates completion scripts for zsh.`,
+		Example: `To load completion run
+
+	. <(hauler completion zsh)
+
+	To configure your zsh shell to load completions for each session add to your zshrc
+
+	# ~/.zshrc or ~/.profile
+	command -v hauler >/dev/null && . <(hauler completion zsh)
+
+	or write a cached file in one of the completion directories in your ${fpath}:
+
+	echo "${fpath// /\n}" | grep -i completion
+	hauler completion zsh > _hauler
+
+	mv _hauler ~/.oh-my-zsh/completions  # oh-my-zsh
+	mv _hauler ~/.zprezto/modules/completion/external/src/  # zprezto`,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmd.GenZshCompletion(os.Stdout)
+			// Cobra doesn't source zsh completion file, explicitly doing it here
+			fmt.Println("compdef _hauler hauler")
+		},
+	}
+	return cmd
+}
+
+func addCompletionBash() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "bash",
+		Short: "Generates bash completion scripts",
+		Long:  `The completion sub-command generates completion scripts for bash.`,
+		Example: `To load completion run
+
+	. <(hauler completion bash)
+
+	To configure your bash shell to load completions for each session add to your bashrc
+
+	# ~/.bashrc or ~/.profile
+	command -v hauler >/dev/null && . <(hauler completion bash)`,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmd.GenBashCompletion(os.Stdout)
+		},
+	}
+	return cmd
+}
+
+func addCompletionFish() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "fish",
+		Short: "Generates fish completion scripts",
+		Long:  `The completion sub-command generates completion scripts for fish.`,
+		Example: `To configure your fish shell to load completions for each session write this script to your completions dir:
+
+	hauler completion fish > ~/.config/fish/completions/hauler.fish
+
+	See http://fishshell.com/docs/current/index.html#completion-own for more details`,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmd.GenFishCompletion(os.Stdout, true)
+		},
+	}
+	return cmd
+}
+
+func addCompletionPowershell() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "powershell",
+		Short: "Generates powershell completion scripts",
+		Long:  `The completion sub-command generates completion scripts for powershell.`,
+		Example: `To load completion run
+
+	. <(hauler completion powershell)
+
+	To configure your powershell shell to load completions for each session add to your powershell profile
+
+	Windows:
+
+	cd "$env:USERPROFILE\Documents\WindowsPowerShell\Modules"
+	hauler completion powershell >> hauler-completion.ps1
+
+	Linux:
+
+	cd "${XDG_CONFIG_HOME:-"$HOME/.config/"}/powershell/modules"
+	hauler completion powershell >> hauler-completions.ps1`,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmd.GenPowerShellCompletion(os.Stdout)
+		},
+	}
+	return cmd
+}