menuconfig: Assign jump keys per-page instead of globally

At the moment, keys 1-9 are assigned to the first 9 search results. This patch
makes them assigned to the first 9 results per-page instead. We are much less
likely to run out of keys that way.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: Michal Marek <mmarek@suse.cz>

6 files changed, 149 insertions, 73 deletions

diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index 52f4246bd34..bd2e0989555 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -12,6 +12,7 @@ extern "C" {
 
 #include <assert.h>
 #include <stdio.h>
+#include <sys/queue.h>
 #ifndef __cplusplus
 #include <stdbool.h>
 #endif
@@ -173,6 +174,14 @@ struct menu {
 #define MENU_CHANGED		0x0001
 #define MENU_ROOT		0x0002
 
+struct jump_key {
+	CIRCLEQ_ENTRY(jump_key) entries;
+	size_t offset;
+	struct menu *target;
+	int index;
+};
+CIRCLEQ_HEAD(jk_head, jump_key);
+
 #define JUMP_NB			9
 
 extern struct file *file_list;
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index 946c2cb367f..1d1c08537f1 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -21,10 +21,10 @@ P(menu_get_root_menu,struct menu *,(struct menu *menu));
 P(menu_get_parent_menu,struct menu *,(struct menu *menu));
 P(menu_has_help,bool,(struct menu *menu));
 P(menu_get_help,const char *,(struct menu *menu));
-P(get_symbol_str, int, (struct gstr *r, struct symbol *sym, struct menu
-			**jumps, int jump_nb));
-P(get_relations_str, struct gstr, (struct symbol **sym_arr, struct menu
-				   **jumps));
+P(get_symbol_str, void, (struct gstr *r, struct symbol *sym, struct jk_head
+			 *head));
+P(get_relations_str, struct gstr, (struct symbol **sym_arr, struct jk_head
+				   *head));
 P(menu_get_ext_help,void,(struct menu *menu, struct gstr *help));
 
 /* symbol.c */
diff --git a/scripts/kconfig/lxdialog/dialog.h b/scripts/kconfig/lxdialog/dialog.h
index 2a01cdfae5a..ee17a5264d5 100644
--- a/scripts/kconfig/lxdialog/dialog.h
+++ b/scripts/kconfig/lxdialog/dialog.h
@@ -210,8 +210,13 @@ int first_alpha(const char *string, const char *exempt);
 int dialog_yesno(const char *title, const char *prompt, int height, int width);
 int dialog_msgbox(const char *title, const char *prompt, int height,
 		  int width, int pause);
-int dialog_textbox(const char *title, const char *file, int height, int width,
-		   int *keys, int *_vscroll, int *_hscroll);
+
+
+typedef void (*update_text_fn)(char *buf, size_t start, size_t end, void
+			       *_data);
+int dialog_textbox(const char *title, char *tbuf, int initial_height,
+		   int initial_width, int *keys, int *_vscroll, int *_hscroll,
+		   update_text_fn update_text, void *data);
 int dialog_menu(const char *title, const char *prompt,
 		const void *selected, int *s_scroll);
 int dialog_checklist(const char *title, const char *prompt, int height,
diff --git a/scripts/kconfig/lxdialog/textbox.c b/scripts/kconfig/lxdialog/textbox.c
index 3b3c5c470bf..a48bb93e090 100644
--- a/scripts/kconfig/lxdialog/textbox.c
+++ b/scripts/kconfig/lxdialog/textbox.c
@@ -22,23 +22,25 @@
 #include "dialog.h"
 
 static void back_lines(int n);
-static void print_page(WINDOW * win, int height, int width);
-static void print_line(WINDOW * win, int row, int width);
+static void print_page(WINDOW *win, int height, int width, update_text_fn
+		       update_text, void *data);
+static void print_line(WINDOW *win, int row, int width);
 static char *get_line(void);
 static void print_position(WINDOW * win);
 
 static int hscroll;
 static int begin_reached, end_reached, page_length;
-static const char *buf;
-static const char *page;
+static char *buf;
+static char *page;
 
 /*
  * refresh window content
  */
 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
-							  int cur_y, int cur_x)
+			     int cur_y, int cur_x, update_text_fn update_text,
+			     void *data)
 {
-	print_page(box, boxh, boxw);
+	print_page(box, boxh, boxw, update_text, data);
 	print_position(dialog);
 	wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
 	wrefresh(dialog);
@@ -49,9 +51,11 @@ static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
  * Display text from a file in a dialog box.
  *
  * keys is a null-terminated array
+ * update_text() may not add or remove any '\n' or '\0' in tbuf
  */
-int dialog_textbox(const char *title, const char *tbuf, int initial_height,
-		   int initial_width, int *keys, int *_vscroll, int *_hscroll)
+int dialog_textbox(const char *title, char *tbuf, int initial_height,
+		   int initial_width, int *keys, int *_vscroll, int *_hscroll,
+		   update_text_fn update_text, void *data)
 {
 	int i, x, y, cur_x, cur_y, key = 0;
 	int height, width, boxh, boxw;
@@ -131,7 +135,8 @@ do_resize:
 
 	/* Print first page of text */
 	attr_clear(box, boxh, boxw, dlg.dialog.atr);
-	refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
+	refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
+			 data);
 
 	while (!done) {
 		key = wgetch(dialog);
@@ -150,7 +155,8 @@ do_resize:
 				begin_reached = 1;
 				page = buf;
 				refresh_text_box(dialog, box, boxh, boxw,
-						 cur_y, cur_x);
+						 cur_y, cur_x, update_text,
+						 data);
 			}
 			break;
 		case 'G':	/* Last page */
@@ -160,8 +166,8 @@ do_resize:
 			/* point to last char in buf */
 			page = buf + strlen(buf);
 			back_lines(boxh);
-			refresh_text_box(dialog, box, boxh, boxw,
-					 cur_y, cur_x);
+			refresh_text_box(dialog, box, boxh, boxw, cur_y,
+					 cur_x, update_text, data);
 			break;
 		case 'K':	/* Previous line */
 		case 'k':
@@ -171,7 +177,7 @@ do_resize:
 
 			back_lines(page_length + 1);
 			refresh_text_box(dialog, box, boxh, boxw, cur_y,
-					 cur_x);
+					 cur_x, update_text, data);
 			break;
 		case 'B':	/* Previous page */
 		case 'b':
@@ -180,8 +186,8 @@ do_resize:
 			if (begin_reached)
 				break;
 			back_lines(page_length + boxh);
-			refresh_text_box(dialog, box, boxh, boxw,
-					 cur_y, cur_x);
+			refresh_text_box(dialog, box, boxh, boxw, cur_y,
+					 cur_x, update_text, data);
 			break;
 		case 'J':	/* Next line */
 		case 'j':
@@ -191,7 +197,7 @@ do_resize:
 
 			back_lines(page_length - 1);
 			refresh_text_box(dialog, box, boxh, boxw, cur_y,
-					 cur_x);
+					 cur_x, update_text, data);
 			break;
 		case KEY_NPAGE:	/* Next page */
 		case ' ':
@@ -200,8 +206,8 @@ do_resize:
 				break;
 
 			begin_reached = 0;
-			refresh_text_box(dialog, box, boxh, boxw,
-					 cur_y, cur_x);
+			refresh_text_box(dialog, box, boxh, boxw, cur_y,
+					 cur_x, update_text, data);
 			break;
 		case '0':	/* Beginning of line */
 		case 'H':	/* Scroll left */
@@ -216,8 +222,8 @@ do_resize:
 				hscroll--;
 			/* Reprint current page to scroll horizontally */
 			back_lines(page_length);
-			refresh_text_box(dialog, box, boxh, boxw,
-					 cur_y, cur_x);
+			refresh_text_box(dialog, box, boxh, boxw, cur_y,
+					 cur_x, update_text, data);
 			break;
 		case 'L':	/* Scroll right */
 		case 'l':
@@ -227,8 +233,8 @@ do_resize:
 			hscroll++;
 			/* Reprint current page to scroll horizontally */
 			back_lines(page_length);
-			refresh_text_box(dialog, box, boxh, boxw,
-					 cur_y, cur_x);
+			refresh_text_box(dialog, box, boxh, boxw, cur_y,
+					 cur_x, update_text, data);
 			break;
 		case KEY_ESC:
 			if (on_key_esc(dialog) == KEY_ESC)
@@ -301,12 +307,23 @@ static void back_lines(int n)
 }
 
 /*
- * Print a new page of text. Called by dialog_textbox().
+ * Print a new page of text.
  */
-static void print_page(WINDOW * win, int height, int width)
+static void print_page(WINDOW *win, int height, int width, update_text_fn
+		       update_text, void *data)
 {
 	int i, passed_end = 0;
 
+	if (update_text) {
+		char *end;
+
+		for (i = 0; i < height; i++)
+			get_line();
+		end = page;
+		back_lines(height);
+		update_text(buf, page - buf, end - buf, data);
+	}
+
 	page_length = 0;
 	for (i = 0; i < height; i++) {
 		print_line(win, i, width);
@@ -319,7 +336,7 @@ static void print_page(WINDOW * win, int height, int width)
 }
 
 /*
- * Print a new line of text. Called by dialog_textbox() and print_page().
+ * Print a new line of text.
  */
 static void print_line(WINDOW * win, int row, int width)
 {
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 6f409745b37..48f67448af7 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -286,8 +286,9 @@ static void conf_choice(struct menu *menu);
 static void conf_string(struct menu *menu);
 static void conf_load(void);
 static void conf_save(void);
-static int show_textbox_ext(const char *title, const char *text, int r, int c,
-			    int *keys, int *vscroll, int *hscroll);
+static int show_textbox_ext(const char *title, char *text, int r, int c,
+			    int *keys, int *vscroll, int *hscroll,
+			    update_text_fn update_text, void *data);
 static void show_textbox(const char *title, const char *text, int r, int c);
 static void show_helptext(const char *title, const char *text);
 static void show_help(struct menu *menu);
@@ -310,6 +311,39 @@ static void set_config_filename(const char *config_filename)
 }
 
 
+struct search_data {
+	struct jk_head *head;
+	struct menu **targets;
+	int *keys;
+};
+
+static void update_text(char *buf, size_t start, size_t end, void *_data)
+{
+	struct search_data *data = _data;
+	struct jump_key *pos;
+	int k = 0;
+
+	CIRCLEQ_FOREACH(pos, data->head, entries) {
+		if (pos->offset >= start && pos->offset < end) {
+			char header[4];
+
+			if (k < JUMP_NB) {
+				int key = '0' + (pos->index % JUMP_NB) + 1;
+
+				sprintf(header, "(%c)", key);
+				data->keys[k] = key;
+				data->targets[k] = pos->target;
+				k++;
+			} else {
+				sprintf(header, "   ");
+			}
+
+			memcpy(buf + pos->offset, header, sizeof(header) - 1);
+		}
+	}
+	data->keys[k] = 0;
+}
+
 static void search_conf(void)
 {
 	struct symbol **sym_arr;
@@ -341,18 +375,24 @@ again:
 
 	sym_arr = sym_re_search(dialog_input);
 	do {
-		struct menu *jumps[JUMP_NB] = {0};
-		int keys[JUMP_NB + 1] = {0}, i;
-
-		res = get_relations_str(sym_arr, jumps);
-		for (i = 0; i < JUMP_NB && jumps[i]; i++)
-			keys[i] = '1' + i;
-		dres = show_textbox_ext(_("Search Results"), str_get(&res), 0,
-					0, keys, &vscroll, &hscroll);
+		struct jk_head head = CIRCLEQ_HEAD_INITIALIZER(head);
+		struct menu *targets[JUMP_NB];
+		int keys[JUMP_NB + 1], i;
+		struct search_data data = {
+			.head = &head,
+			.targets = targets,
+			.keys = keys,
+		};
+
+		res = get_relations_str(sym_arr, &head);
+		dres = show_textbox_ext(_("Search Results"), (char *)
+					str_get(&res), 0, 0, keys, &vscroll,
+					&hscroll, &update_text, (void *)
+					&data);
 		again = false;
-		for (i = 0; i < JUMP_NB && jumps[i]; i++)
+		for (i = 0; i < JUMP_NB && keys[i]; i++)
 			if (dres == keys[i]) {
-				conf(jumps[i]->parent, jumps[i]);
+				conf(targets[i]->parent, targets[i]);
 				again = true;
 			}
 		str_free(&res);
@@ -642,16 +682,19 @@ static void conf(struct menu *menu, struct menu *active_menu)
 	}
 }
 
-static int show_textbox_ext(const char *title, const char *text, int r, int c,
-			    int *keys, int *vscroll, int *hscroll)
+static int show_textbox_ext(const char *title, char *text, int r, int c, int
+			    *keys, int *vscroll, int *hscroll, update_text_fn
+			    update_text, void *data)
 {
 	dialog_clear();
-	return dialog_textbox(title, text, r, c, keys, vscroll, hscroll);
+	return dialog_textbox(title, text, r, c, keys, vscroll, hscroll,
+			      update_text, data);
 }
 
 static void show_textbox(const char *title, const char *text, int r, int c)
 {
-	show_textbox_ext(title, text, r, c, (int []) {0}, NULL, NULL);
+	show_textbox_ext(title, (char *) text, r, c, (int []) {0}, NULL, NULL,
+			 NULL, NULL);
 }
 
 static void show_helptext(const char *title, const char *text)
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index a5241859326..a3cade659f8 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -507,12 +507,12 @@ const char *menu_get_help(struct menu *menu)
 		return "";
 }
 
-static int get_prompt_str(struct gstr *r, struct property *prop, struct menu
-			  **jumps, int jump_nb)
+static void get_prompt_str(struct gstr *r, struct property *prop,
+			   struct jk_head *head)
 {
 	int i, j;
-	char header[4];
 	struct menu *submenu[8], *menu, *location = NULL;
+	struct jump_key *jump;
 
 	str_printf(r, _("Prompt: %s\n"), _(prop->text));
 	str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
@@ -530,7 +530,9 @@ static int get_prompt_str(struct gstr *r, struct property *prop, struct menu
 		if (location == NULL && accessible)
 			location = menu;
 	}
-	if (jumps && jump_nb < JUMP_NB && location) {
+	if (head && location) {
+		jump = malloc(sizeof(struct jump_key));
+
 		if (menu_is_visible(prop->menu)) {
 			/*
 			 * There is not enough room to put the hint at the
@@ -538,19 +540,26 @@ static int get_prompt_str(struct gstr *r, struct property *prop, struct menu
 			 * last "Location" line even when it would belong on
 			 * the former.
 			 */
-			jumps[jump_nb] = prop->menu;
+			jump->target = prop->menu;
 		} else
-			jumps[jump_nb] = location;
-		snprintf(header, 4, "(%d)", jump_nb + 1);
-	} else
-		location = NULL;
+			jump->target = location;
+
+		if (CIRCLEQ_EMPTY(head))
+			jump->index = 0;
+		else
+			jump->index = CIRCLEQ_LAST(head)->index + 1;
+
+		CIRCLEQ_INSERT_TAIL(head, jump, entries);
+	}
 
 	if (i > 0) {
 		str_printf(r, _("  Location:\n"));
-		for (j = 1; --i >= 0; j += 2) {
+		for (j = 4; --i >= 0; j += 2) {
 			menu = submenu[i];
-			str_printf(r, "%s%*c-> %s", menu == location ? header
-				   : "   ", j, ' ', _(menu_get_prompt(menu)));
+			if (head && location && menu == location)
+				jump->offset = r->len - 1;
+			str_printf(r, "%*c-> %s", j, ' ',
+				   _(menu_get_prompt(menu)));
 			if (menu->sym) {
 				str_printf(r, " (%s [=%s])", menu->sym->name ?
 					menu->sym->name : _("<choice>"),
@@ -559,20 +568,15 @@ static int get_prompt_str(struct gstr *r, struct property *prop, struct menu
 			str_append(r, "\n");
 		}
 	}
-
-	return location ? 1 : 0;
 }
 
 /*
- * jumps is optional and may be NULL
- * returns the number of jumps inserted
+ * head is optional and may be NULL
  */
-int get_symbol_str(struct gstr *r, struct symbol *sym, struct menu **jumps,
-		   int jump_nb)
+void get_symbol_str(struct gstr *r, struct symbol *sym, struct jk_head *head)
 {
 	bool hit;
 	struct property *prop;
-	int i = 0;
 
 	if (sym && sym->name) {
 		str_printf(r, "Symbol: %s [=%s]\n", sym->name,
@@ -588,7 +592,7 @@ int get_symbol_str(struct gstr *r, struct symbol *sym, struct menu **jumps,
 		}
 	}
 	for_all_prompts(sym, prop)
-		i += get_prompt_str(r, prop, jumps, jump_nb + i);
+		get_prompt_str(r, prop, head);
 	hit = false;
 	for_all_properties(sym, prop, P_SELECT) {
 		if (!hit) {
@@ -606,18 +610,16 @@ int get_symbol_str(struct gstr *r, struct symbol *sym, struct menu **jumps,
 		str_append(r, "\n");
 	}
 	str_append(r, "\n\n");
-
-	return i;
 }
 
-struct gstr get_relations_str(struct symbol **sym_arr, struct menu **jumps)
+struct gstr get_relations_str(struct symbol **sym_arr, struct jk_head *head)
 {
 	struct symbol *sym;
 	struct gstr res = str_new();
-	int i, jump_nb = 0;
+	int i;
 
 	for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
-		jump_nb += get_symbol_str(&res, sym, jumps, jump_nb);
+		get_symbol_str(&res, sym, head);
 	if (!i)
 		str_append(&res, _("No matches found.\n"));
 	return res;
@@ -636,5 +638,5 @@ void menu_get_ext_help(struct menu *menu, struct gstr *help)
 	}
 	str_printf(help, "%s\n", _(help_text));
 	if (sym)
-		get_symbol_str(help, sym, NULL, 0);
+		get_symbol_str(help, sym, NULL);
 }