[#1041] cmd/*: factor out autocomplet command generation

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

cmd/neofs-cli/modules/completion.go

@@ -1,62 +1,9 @@
 package cmd
 
 import (
-	"os"
-
-	"github.com/spf13/cobra"
+	"github.com/nspcc-dev/neofs-node/pkg/util/autocomplete"
 )
 
-var completionCmd = &cobra.Command{
-	Use:   "completion [bash|zsh|fish|powershell]",
-	Short: "Generate completion script",
-	Long: `To load completions:
-
-Bash:
-
-$ source <(neofs-cli completion bash)
-
-# To load completions for each session, execute once:
-Linux:
-  $ neofs-cli completion bash > /etc/bash_completion.d/neofs-cli
-MacOS:
-  $ neofs-cli completion bash > /usr/local/etc/bash_completion.d/neofs-cli
-
-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:
-$ neofs-cli completion zsh > "${fpath[1]}/_neofs-cli"
-
-# You will need to start a new shell for this setup to take effect.
-
-Fish:
-
-$ neofs-cli completion fish | source
-
-# To load completions for each session, execute once:
-$ neofs-cli completion fish > ~/.config/fish/completions/neofs-cli.fish
-`,
-	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)
-		}
-	},
-}
-
 func init() {
-	rootCmd.AddCommand(completionCmd)
+	rootCmd.AddCommand(autocomplete.Command("neofs-cli"))
 }