fixing auto complete (#7365)

* fixing auto complete

* Update weed/command/autocomplete.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/command/autocomplete.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/command/autocomplete.go

@@ -2,6 +2,8 @@ package command
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"github.com/posener/complete"
 	completeinstall "github.com/posener/complete/cmd/install"
 	flag "github.com/seaweedfs/seaweedfs/weed/util/fla9"
@@ -39,6 +41,40 @@ func AutocompleteMain(commands []*Command) bool {
 	return cmp.Complete()
 }
 
+func printAutocompleteScript(shell string) bool {
+	bin, err := os.Executable()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to get executable path: %s\n", err)
+		return false
+	}
+	binPath, err := filepath.Abs(bin)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to get absolute path: %s\n", err)
+		return false
+	}
+
+ 	switch shell {
+ 	case "bash":
+ 		fmt.Printf("complete -C %q weed\n", binPath)
+ 	case "zsh":
+ 		fmt.Printf("autoload -U +X bashcompinit && bashcompinit\n")
+ 		fmt.Printf("complete -o nospace -C %q weed\n", binPath)
+ 	case "fish":
+ 		fmt.Printf(`function __complete_weed
+    set -lx COMP_LINE (commandline -cp)
+    test -z (commandline -ct)
+    and set COMP_LINE "$COMP_LINE "
+    %q
+end
+complete -f -c weed -a "(__complete_weed)"
+`, binPath)
+ 	default:
+ 		fmt.Fprintf(os.Stderr, "unsupported shell: %s. Supported shells: bash, zsh, fish\n", shell)
+ 		return false
+ 	}
+	return true
+}
+
 func installAutoCompletion() bool {
 	if runtime.GOOS == "windows" {
 		fmt.Println("Windows is not supported")
@@ -71,9 +107,25 @@ func uninstallAutoCompletion() bool {
 
 var cmdAutocomplete = &Command{
 	Run:       runAutocomplete,
-	UsageLine: "autocomplete",
-	Short:     "install autocomplete",
-	Long: `weed autocomplete is installed in the shell.
+	UsageLine: "autocomplete [shell]",
+	Short:     "generate or install shell autocomplete script",
+	Long: `Generate shell autocomplete script or install it to your shell configuration.
+
+Usage:
+    weed autocomplete [bash|zsh|fish]  # print autocomplete script to stdout
+    weed autocomplete install          # install to shell config files
+
+    When a shell name is provided, the autocomplete script is printed to stdout.
+    You can then add it to your shell configuration manually, e.g.:
+
+        # For bash:
+        weed autocomplete bash >> ~/.bashrc
+
+        # Or use eval in your shell config:
+        eval "$(weed autocomplete bash)"
+
+    When 'install' is provided (or no argument), the script is automatically
+    installed to your shell configuration files.
 
     Supported shells are bash, zsh, and fish.
     Windows is not supported.
@@ -82,11 +134,23 @@ var cmdAutocomplete = &Command{
 }
 
 func runAutocomplete(cmd *Command, args []string) bool {
-	if len(args) != 0 {
+	if len(args) == 0 {
+		// Default behavior: install
+		return installAutoCompletion()
+	}
+
+	if len(args) > 1 {
 		cmd.Usage()
+		return false
+	}
+
+	shell := args[0]
+	if shell == "install" {
+		return installAutoCompletion()
 	}
 
-	return installAutoCompletion()
+	// Print the autocomplete script for the specified shell
+	return printAutocompleteScript(shell)
 }
 
 var cmdUnautocomplete = &Command{