[menu] Add "--default" option to "choose" command

Suggested-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/commands/menu_cmd.c

 	const char *menu;
 	/** Timeout */
 	unsigned int timeout;
+	/** Default selection */
+	const char *select;
 	/** Keep menu */
 	int keep;
 };
 static struct option_descriptor choose_opts[] = {
 	OPTION_DESC ( "menu", 'm', required_argument,
 		      struct choose_options, menu, parse_string ),
+	OPTION_DESC ( "default", 'd', required_argument,
+		      struct choose_options, select, parse_string ),
 	OPTION_DESC ( "timeout", 't', required_argument,
 		      struct choose_options, timeout, parse_integer ),
 	OPTION_DESC ( "keep", 'k', no_argument,
 /** "choose" command descriptor */
 static struct command_descriptor choose_cmd =
 	COMMAND_DESC ( struct choose_options, choose_opts, 1, 1,
-		       "[--menu <menu>] [--timeout <timeout>] [--keep] "
-		       "<setting>" );
+		       "[--menu <menu>] [--default <label>] "
+		       "[--timeout <timeout>] [--keep] <setting>" );
 
 /**
  * The "choose" command
 		goto err_parse_menu;
 
 	/* Show menu */
-	if ( ( rc = show_menu ( menu, opts.timeout, &item ) ) != 0 )
+	if ( ( rc = show_menu ( menu, opts.timeout, opts.select, &item ) ) != 0)
 		goto err_show_menu;
 
 	/* Store setting */

src/hci/tui/menu_ui.c

  * @ret rc		Return status code
  */
 int show_menu ( struct menu *menu, unsigned int timeout_ms,
-		struct menu_item **selected ) {
+		const char *select, struct menu_item **selected ) {
 	struct menu_item *item;
 	struct menu_ui ui;
 	int labelled_count = 0;
 			if ( ! labelled_count )
 				ui.selected = ui.count;
 			labelled_count++;
-			if ( item->is_default )
-				ui.selected = ui.count;
+			if ( select ) {
+				if ( strcmp ( select, item->label ) == 0 )
+					ui.selected = ui.count;
+			} else {
+				if ( item->is_default )
+					ui.selected = ui.count;
+			}
 		}
 		ui.count++;
 	}

src/include/ipxe/menu.h

 extern void destroy_menu ( struct menu *menu );
 extern struct menu * find_menu ( const char *name );
 extern int show_menu ( struct menu *menu, unsigned int timeout_ms,
-		       struct menu_item **selected );
+		       const char *select, struct menu_item **selected );
 
 #endif /* _IPXE_MENU_H */