kconfig: nconf: Add search jump feature

Menuconfig has a feature where you can "press the key in the (#) prefix
to jump directly to that location. You will be returned to the current
search results after exiting this new menu."

This commit adds this feature to nconfig, with almost identical code.
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/nconf.c

@@ -220,7 +220,7 @@ search_help[] =
 "Location:\n"
 "  -> Bus options (PCI, PCMCIA, EISA, ISA)\n"
 "    -> PCI support (PCI [ = y])\n"
-"      -> PCI access mode (<choice> [ = y])\n"
+"(1)   -> PCI access mode (<choice> [ = y])\n"
 "Selects: LIBCRC32\n"
 "Selected by: BAR\n"
 "-----------------------------------------------------------------\n"
@@ -231,9 +231,13 @@ search_help[] =
 "o  The 'Depends on:' line lists symbols that need to be defined for\n"
 "   this symbol to be visible and selectable in the menu.\n"
 "o  The 'Location:' lines tell, where in the menu structure this symbol\n"
-"   is located.  A location followed by a [ = y] indicates that this is\n"
-"   a selectable menu item, and the current value is displayed inside\n"
-"   brackets.\n"
+"   is located.\n"
+"     A location followed by a [ = y] indicates that this is\n"
+"     a selectable menu item, and the current value is displayed inside\n"
+"     brackets.\n"
+"     Press the key in the (#) prefix to jump directly to that\n"
+"     location. You will be returned to the current search results\n"
+"     after exiting this new menu.\n"
 "o  The 'Selects:' line tells, what symbol will be automatically selected\n"
 "   if this symbol is selected (y or m).\n"
 "o  The 'Selected by' line tells what symbol has selected this symbol.\n"
@@ -275,7 +279,9 @@ static const char *current_instructions = menu_instructions;
 
 static char *dialog_input_result;
 static int dialog_input_result_len;
+static int jump_key_char;
 
+static void selected_conf(struct menu *menu, struct menu *active_menu);
 static void conf(struct menu *menu);
 static void conf_choice(struct menu *menu);
 static void conf_string(struct menu *menu);
@@ -685,6 +691,57 @@ static int do_exit(void)
 	return 0;
 }
 
+struct search_data {
+	struct list_head *head;
+	struct menu *target;
+};
+
+static int next_jump_key(int key)
+{
+	if (key < '1' || key > '9')
+		return '1';
+
+	key++;
+
+	if (key > '9')
+		key = '1';
+
+	return key;
+}
+
+static int handle_search_keys(int key, size_t start, size_t end, void *_data)
+{
+	struct search_data *data = _data;
+	struct jump_key *pos;
+	int index = 0;
+
+	if (key < '1' || key > '9')
+		return 0;
+
+	list_for_each_entry(pos, data->head, entries) {
+		index = next_jump_key(index);
+
+		if (pos->offset < start)
+			continue;
+
+		if (pos->offset >= end)
+			break;
+
+		if (key == index) {
+			data->target = pos->target;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int get_jump_key_char(void)
+{
+	jump_key_char = next_jump_key(jump_key_char);
+
+	return jump_key_char;
+}
 
 static void search_conf(void)
 {
@@ -692,7 +749,8 @@ static void search_conf(void)
 	struct gstr res;
 	struct gstr title;
 	char *dialog_input;
-	int dres;
+	int dres, vscroll = 0, hscroll = 0;
+	bool again;
 
 	title = str_new();
 	str_printf( &title, "Enter (sub)string or regexp to search for "
@@ -721,11 +779,28 @@ static void search_conf(void)
 		dialog_input += strlen(CONFIG_);
 
 	sym_arr = sym_re_search(dialog_input);
-	res = get_relations_str(sym_arr, NULL);
+
+	do {
+		LIST_HEAD(head);
+		struct search_data data = {
+			.head = &head,
+			.target = NULL,
+		};
+		jump_key_char = 0;
+		res = get_relations_str(sym_arr, &head);
+		dres = show_scroll_win_ext(main_window,
+				"Search Results", str_get(&res),
+				&vscroll, &hscroll,
+				handle_search_keys, &data);
+		again = false;
+		if (dres >= '1' && dres <= '9') {
+			assert(data.target != NULL);
+			selected_conf(data.target->parent, data.target);
+			again = true;
+		}
+		str_free(&res);
+	} while (again);
 	free(sym_arr);
-	show_scroll_win(main_window,
-			"Search Results", str_get(&res));
-	str_free(&res);
 	str_free(&title);
 }
 
@@ -1062,10 +1137,15 @@ static int do_match(int key, struct match_state *state, int *ans)
 }
 
 static void conf(struct menu *menu)
+{
+	selected_conf(menu, NULL);
+}
+
+static void selected_conf(struct menu *menu, struct menu *active_menu)
 {
 	struct menu *submenu = NULL;
 	struct symbol *sym;
-	int res;
+	int i, res;
 	int current_index = 0;
 	int last_top_row = 0;
 	struct match_state match_state = {
@@ -1081,6 +1161,19 @@ static void conf(struct menu *menu)
 		if (!child_count)
 			break;
 
+		if (active_menu != NULL) {
+			for (i = 0; i < items_num; i++) {
+				struct mitem *mcur;
+
+				mcur = (struct mitem *) item_userptr(curses_menu_items[i]);
+				if ((struct menu *) mcur->usrptr == active_menu) {
+					current_index = i;
+					break;
+				}
+			}
+			active_menu = NULL;
+		}
+
 		show_menu(menu_get_prompt(menu), menu_instructions,
 			  current_index, &last_top_row);
 		keypad((menu_win(curses_menu)), TRUE);

scripts/kconfig/nconf.gui.c

@@ -497,10 +497,17 @@ void refresh_all_windows(WINDOW *main_window)
 	refresh();
 }
 
-/* layman's scrollable window... */
 void show_scroll_win(WINDOW *main_window,
 		const char *title,
 		const char *text)
+{
+	(void)show_scroll_win_ext(main_window, title, (char *)text, NULL, NULL, NULL, NULL);
+}
+
+/* layman's scrollable window... */
+int show_scroll_win_ext(WINDOW *main_window, const char *title, char *text,
+			int *vscroll, int *hscroll,
+			extra_key_cb_fn extra_key_cb, void *data)
 {
 	int res;
 	int total_lines = get_line_no(text);
@@ -514,6 +521,12 @@ void show_scroll_win(WINDOW *main_window,
 	WINDOW *win;
 	WINDOW *pad;
 	PANEL *panel;
+	bool done = false;
+
+	if (hscroll)
+		start_x = *hscroll;
+	if (vscroll)
+		start_y = *vscroll;
 
 	getmaxyx(stdscr, lines, columns);
 
@@ -549,8 +562,7 @@ void show_scroll_win(WINDOW *main_window,
 	panel = new_panel(win);
 
 	/* handle scrolling */
-	do {
-
+	while (!done) {
 		copywin(pad, win, start_y, start_x, 2, 2, text_lines,
 				text_cols, 0);
 		print_in_middle(win,
@@ -593,8 +605,18 @@ void show_scroll_win(WINDOW *main_window,
 		case 'l':
 			start_x++;
 			break;
+		default:
+			if (extra_key_cb) {
+				size_t start = (get_line(text, start_y) - text);
+				size_t end = (get_line(text, start_y + text_lines) - text);
+
+				if (extra_key_cb(res, start, end, data)) {
+					done = true;
+					break;
+				}
+			}
 		}
-		if (res == 10 || res == 27 || res == 'q' ||
+		if (res == 0 || res == 10 || res == 27 || res == 'q' ||
 			res == KEY_F(F_HELP) || res == KEY_F(F_BACK) ||
 			res == KEY_F(F_EXIT))
 			break;
@@ -606,9 +628,14 @@ void show_scroll_win(WINDOW *main_window,
 			start_x = 0;
 		if (start_x >= total_cols-text_cols)
 			start_x = total_cols-text_cols;
-	} while (res);
+	}
 
+	if (hscroll)
+		*hscroll = start_x;
+	if (vscroll)
+		*vscroll = start_y;
 	del_panel(panel);
 	delwin(win);
 	refresh_all_windows(main_window);
+	return res;
 }

scripts/kconfig/nconf.h

@@ -67,6 +67,8 @@ typedef enum {
 
 void set_colors(void);
 
+typedef int (*extra_key_cb_fn)(int, size_t, size_t, void *);
+
 /* this changes the windows attributes !!! */
 void print_in_middle(WINDOW *win, int y, int width, const char *str, int attrs);
 int get_line_length(const char *line);
@@ -78,6 +80,9 @@ int dialog_inputbox(WINDOW *main_window,
 		const char *title, const char *prompt,
 		const char *init, char **resultp, int *result_len);
 void refresh_all_windows(WINDOW *main_window);
+int show_scroll_win_ext(WINDOW *main_window, const char *title, char *text,
+			int *vscroll, int *hscroll,
+			extra_key_cb_fn extra_key_cb, void *data);
 void show_scroll_win(WINDOW *main_window,
 		const char *title,
 		const char *text);