Merge pull request #82 from ksctl/feature/78

feat(completion): add shell completion support

Author: dipankardas011

cmd/completion.go

@@ -0,0 +1,54 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func (k *KsctlCommand) ShellCompletion() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "completion [bash|zsh|fish]",
+		Short: "Generate shell completion scripts",
+		Long: `To load completions:
+
+Bash:
+
+  $ source <(ksctl completion bash)
+
+  # To load completions for each session, execute once:
+  # Linux:
+  $ ksctl completion bash > /etc/bash_completion.d/ksctl
+  # macOS:
+  $ ksctl completion bash > /usr/local/etc/bash_completion.d/ksctl
+
+Zsh:
+
+  $ echo "autoload -U compinit; compinit" >> ~/.zshrc
+  $ ksctl completion zsh > "${fpath[1]}/_ksctl"
+
+Fish:
+
+  $ ksctl completion fish | source
+
+  # To load completions for each session, execute once:
+  $ ksctl completion fish > ~/.config/fish/completions/ksctl.fish
+`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			switch args[0] {
+			case "bash":
+				return cmd.Root().GenBashCompletion(os.Stdout)
+			case "zsh":
+				return cmd.Root().GenZshCompletion(os.Stdout)
+			case "fish":
+				return cmd.Root().GenFishCompletion(os.Stdout, true)
+			default:
+				return fmt.Errorf("unsupported shell: %s", args[0])
+			}
+		},
+	}
+
+	return cmd
+}

cmd/handler.go

@@ -26,6 +26,7 @@ func (k *KsctlCommand) CommandMapping() error {
 		c,
 		k.Version(),
 		k.SelfUpdate(),
+		k.ShellCompletion(),
 		cr,
 	)
 	cli.RegisterCommand(