add auto completion

completion.go

@@ -0,0 +1,86 @@
+/*
+Copyright © 2023 IITS-Consulting
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+//nolint:gochecknoglobals // commands as globals is the cleanest and easiest way to create (sub)commands
+var completionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion script",
+	Long: fmt.Sprintf(`To load completions:
+
+Bash:
+
+    $ source <(%[1]s completion bash)
+
+    # To load completions for each session, execute once:
+    # Linux:
+    $ %[1]s completion bash > /etc/bash_completion.d/%[1]s
+    # macOS:
+    $ %[1]s completion bash > $(brew --prefix)/etc/bash_completion.d/%[1]s
+
+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:
+    $ %[1]s completion zsh > "${fpath[1]}/_%[1]s"
+
+    # You will need to start a new shell for this setup to take effect.
+
+fish:
+
+    $ %[1]s completion fish | source
+
+    # To load completions for each session, execute once:
+    $ %[1]s completion fish > ~/.config/fish/completions/%[1]s.fish
+
+PowerShell:
+
+    PS> %[1]s completion powershell | Out-String | Invoke-Expression
+
+    # To load completions for every new session, run:
+    PS> %[1]s completion powershell > %[1]s.ps1
+    # and source this file from your PowerShell profile.
+`, "charter"),
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		var err error
+		switch args[0] {
+		case "bash":
+			err = cmd.Root().GenBashCompletion(os.Stdout)
+		case "zsh":
+			err = cmd.Root().GenZshCompletion(os.Stdout)
+		case "fish":
+			err = cmd.Root().GenFishCompletion(os.Stdout, true)
+		case "powershell":
+			err = cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+		}
+		return err
+	},
+}

main.go

@@ -22,6 +22,7 @@ func main() {
 	rootCmd.Version = version
 	rootCmd.PersistentFlags().StringVarP(&overrideReleaseName, "override-release-name", "o", folderName, "Override the chart's release name")
 	rootCmd.AddCommand(cmdInfrastructureCharts)
+	rootCmd.AddCommand(completionCmd)
 	cobra.CheckErr(rootCmd.Execute())
 }