[menu] Add the abstract concept of a menu

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

src/include/ipxe/menu.h

@@ -0,0 +1,47 @@
+#ifndef _IPXE_MENU_H
+#define _IPXE_MENU_H
+
+/** @file
+ *
+ * Menu selection
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/list.h>
+
+/** A menu */
+struct menu {
+	/** List of menus */
+	struct list_head list;
+	/** Name */
+	const char *name;
+	/** Title */
+	const char *title;
+	/** Menu items */
+	struct list_head items;
+};
+
+/** A menu item */
+struct menu_item {
+	/** List of menu items */
+	struct list_head list;
+	/** Label */
+	const char *label;
+	/** Text */
+	const char *text;
+	/** Shortcut key */
+	int shortcut;
+	/** Is default item */
+	int is_default;
+};
+
+extern struct menu * create_menu ( const char *name, const char *title );
+extern struct menu_item * add_menu_item ( struct menu *menu, const char *label,
+					  const char *text, int shortcut,
+					  int is_default );
+extern void destroy_menu ( struct menu *menu );
+extern struct menu * find_menu ( const char *name );
+
+#endif /* _IPXE_MENU_H */