doc: update backend doc

backend/cli/cli.go

@@ -13,14 +13,14 @@ type CLIArgs struct {
 	Config string
 	// Init indicates whether to initialize the calendar system before running.
 	Init bool
-	// Username is the first admin user's name; required together with --init.
+	// Username is the first admin user's name; required together with -init.
 	Username string
-	// Password is the first admin user's password; required together with --init.
+	// Password is the first admin user's password; required together with -init.
 	Password string
 }
 
 // Parse parses the command-line arguments via the standard flag package and
-// returns a *CLIArgs. When the required --config flag is missing, it prints the
+// returns a *CLIArgs. When the required -config flag is missing, it prints the
 // usage and exits with status 2 (matching argparse's exit code).
 func Parse() *CLIArgs {
 	args := &CLIArgs{}
@@ -34,19 +34,19 @@ func Parse() *CLIArgs {
 		flag.PrintDefaults()
 	}
 
-	// --config maps to the legacy -c/--config (required), --init to -i/--init.
-	// --username/--password replace the legacy interactive GetUsernamePassword
+	// -config maps to the legacy -c/--config (required), -init to -i/--init.
+	// -username/-password replace the legacy interactive GetUsernamePassword
 	// prompt and are required together with --init.
 	flag.StringVar(&args.Config, "config", "", "The configuration file `CONFIG_TOML` for coconut-leaf")
 	flag.BoolVar(&args.Init, "init", false, "Set for initialize the calendar system")
-	flag.StringVar(&args.Username, "username", "", "The first admin user's name (required with --init)")
-	flag.StringVar(&args.Password, "password", "", "The first admin user's password (required with --init)")
+	flag.StringVar(&args.Username, "username", "", "The first admin user's name (required with -init)")
+	flag.StringVar(&args.Password, "password", "", "The first admin user's password (required with -init)")
 
 	flag.Parse()
 
 	// The standard flag package has no built-in "required", so validate manually.
 	if args.Config == "" {
-		fmt.Fprintln(os.Stderr, "error: the required flag --config is not provided")
+		fmt.Fprintln(os.Stderr, "error: the required flag -config is not provided")
 		flag.Usage()
 		os.Exit(2)
 	}