menuconfig: Extend dialog_textbox so that it can exit on arbitrary keypresses

The caller will be able to perform actions based on hotkeys in the displayed
text.
Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/kconfig/lxdialog/dialog.h

@@ -210,7 +210,8 @@ 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 dialog_textbox(const char *title, const char *file, int height, int width,
+		   int *keys);
 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,

scripts/kconfig/lxdialog/textbox.c

@@ -47,14 +47,16 @@ 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
  */
-int dialog_textbox(const char *title, const char *tbuf,
-		   int initial_height, int initial_width)
+int dialog_textbox(const char *title, const char *tbuf, int initial_height,
+		   int initial_width, int *keys)
 {
 	int i, x, y, cur_x, cur_y, key = 0;
 	int height, width, boxh, boxw;
-	int passed_end;
 	WINDOW *dialog, *box;
+	bool done = false;
 
 	begin_reached = 1;
 	end_reached = 0;
@@ -122,7 +124,7 @@ int dialog_textbox(const char *title, const char *tbuf,
 	attr_clear(box, boxh, boxw, dlg.dialog.atr);
 	refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
 
-	while ((key != KEY_ESC) && (key != '\n')) {
+	while (!done) {
 		key = wgetch(dialog);
 		switch (key) {
 		case 'E':	/* Exit */
@@ -130,9 +132,9 @@ int dialog_textbox(const char *title, const char *tbuf,
 		case 'X':
 		case 'x':
 		case 'q':
-			delwin(box);
-			delwin(dialog);
-			return 0;
+		case '\n':
+			done = true;
+			break;
 		case 'g':	/* First page */
 		case KEY_HOME:
 			if (!begin_reached) {
@@ -156,6 +158,8 @@ int dialog_textbox(const char *title, const char *tbuf,
 		case 'k':
 		case KEY_UP:
 			if (!begin_reached) {
+				int passed_end = 0;
+
 				back_lines(page_length + 1);
 
 				/* We don't call print_page() here but use
@@ -169,7 +173,6 @@ int dialog_textbox(const char *title, const char *tbuf,
 				wscrl(box, -1);	/* Scroll box region down one line */
 				scrollok(box, FALSE);
 				page_length = 0;
-				passed_end = 0;
 				for (i = 0; i < boxh; i++) {
 					if (!i) {
 						/* print first line of page */
@@ -252,7 +255,8 @@ int dialog_textbox(const char *title, const char *tbuf,
 					 cur_y, cur_x);
 			break;
 		case KEY_ESC:
-			key = on_key_esc(dialog);
+			if (on_key_esc(dialog) == KEY_ESC)
+				done = true;
 			break;
 		case KEY_RESIZE:
 			back_lines(height);
@@ -260,11 +264,18 @@ int dialog_textbox(const char *title, const char *tbuf,
 			delwin(dialog);
 			on_key_resize();
 			goto do_resize;
+		default:
+			for (i = 0; keys[i]; i++) {
+				if (key == keys[i]) {
+					done = true;
+					break;
+				}
+			}
 		}
 	}
 	delwin(box);
 	delwin(dialog);
-	return key;		/* ESC pressed */
+	return key;
 }
 
 /*

scripts/kconfig/mconf.c

@@ -279,6 +279,8 @@ 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);
 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);
@@ -618,10 +620,16 @@ static void conf(struct menu *menu)
 	}
 }
 
-static void show_textbox(const char *title, const char *text, int r, int c)
+static int show_textbox_ext(const char *title, const char *text, int r, int c,
+			    int *keys)
 {
 	dialog_clear();
-	dialog_textbox(title, text, r, c);
+	return dialog_textbox(title, text, r, c, keys);
+}
+
+static void show_textbox(const char *title, const char *text, int r, int c)
+{
+	show_textbox_ext(title, text, r, c, (int []) {0});
 }
 
 static void show_helptext(const char *title, const char *text)