menuconfig: Add "breadcrumbs" navigation aid

Displays a trail of the menu entries used to get to the current menu.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[yann.morin.1998@free.fr: small, trivial code re-ordering]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

1 files changed, 70 insertions, 1 deletions

diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index c5418d622a05..387dc8daf7b2 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -311,6 +311,50 @@ static void set_config_filename(const char *config_filename)
                 filename[sizeof(filename)-1] = '\0';
 }
 
+struct subtitle_part {
+        struct list_head entries;
+        const char *text;
+};
+static LIST_HEAD(trail);
+
+static struct subtitle_list *subtitles;
+static void set_subtitle(void)
+{
+        struct subtitle_part *sp;
+        struct subtitle_list *pos, *tmp;
+
+        for (pos = subtitles; pos != NULL; pos = tmp) {
+                tmp = pos->next;
+                free(pos);
+        }
+
+        subtitles = NULL;
+        list_for_each_entry(sp, &trail, entries) {
+                if (sp->text) {
+                        if (pos) {
+                                pos->next = xcalloc(sizeof(*pos), 1);
+                                pos = pos->next;
+                        } else {
+                                subtitles = pos = xcalloc(sizeof(*pos), 1);
+                        }
+                        pos->text = sp->text;
+                }
+        }
+
+        set_dialog_subtitles(subtitles);
+}
+
+static void reset_subtitle(void)
+{
+        struct subtitle_list *pos, *tmp;
+
+        for (pos = subtitles; pos != NULL; pos = tmp) {
+                tmp = pos->next;
+                free(pos);
+        }
+        subtitles = NULL;
+        set_dialog_subtitles(subtitles);
+}
 
 struct search_data {
         struct list_head *head;
@@ -353,6 +397,8 @@ static void search_conf(void)
         char *dialog_input;
         int dres, vscroll = 0, hscroll = 0;
         bool again;
+        struct gstr sttext;
+        struct subtitle_part stpart;
 
         title = str_new();
         str_printf( &title, _("Enter %s (sub)string to search for "
@@ -379,6 +425,11 @@ again:
         if (strncasecmp(dialog_input_result, CONFIG_, strlen(CONFIG_)) == 0)
                 dialog_input += strlen(CONFIG_);
 
+        sttext = str_new();
+        str_printf(&sttext, "Search (%s)", dialog_input_result);
+        stpart.text = str_get(&sttext);
+        list_add_tail(&stpart.entries, &trail);
+
         sym_arr = sym_re_search(dialog_input);
         do {
                 LIST_HEAD(head);
@@ -392,6 +443,7 @@ again:
                 struct jump_key *pos, *tmp;
 
                 res = get_relations_str(sym_arr, &head);
+                set_subtitle();
                 dres = show_textbox_ext(_("Search Results"), (char *)
                                         str_get(&res), 0, 0, keys, &vscroll,
                                         &hscroll, &update_text, (void *)
@@ -408,6 +460,8 @@ again:
         } while (again);
         free(sym_arr);
         str_free(&title);
+        list_del(trail.prev);
+        str_free(&sttext);
 }
 
 static void build_conf(struct menu *menu)
@@ -592,16 +646,24 @@ static void conf(struct menu *menu, struct menu *active_menu)
 {
         struct menu *submenu;
         const char *prompt = menu_get_prompt(menu);
+        struct subtitle_part stpart;
         struct symbol *sym;
         int res;
         int s_scroll = 0;
 
+        if (menu != &rootmenu)
+                stpart.text = menu_get_prompt(menu);
+        else
+                stpart.text = NULL;
+        list_add_tail(&stpart.entries, &trail);
+
         while (1) {
                 item_reset();
                 current_menu = menu;
                 build_conf(menu);
                 if (!child_count)
                         break;
+                set_subtitle();
                 dialog_clear();
                 res = dialog_menu(prompt ? _(prompt) : _("Main Menu"),
                                   _(menu_instructions),
@@ -643,13 +705,17 @@ static void conf(struct menu *menu, struct menu *active_menu)
                 case 2:
                         if (sym)
                                 show_help(submenu);
-                        else
+                        else {
+                                reset_subtitle();
                                 show_helptext(_("README"), _(mconf_readme));
+                        }
                         break;
                 case 3:
+                        reset_subtitle();
                         conf_save();
                         break;
                 case 4:
+                        reset_subtitle();
                         conf_load();
                         break;
                 case 5:
@@ -682,6 +748,8 @@ static void conf(struct menu *menu, struct menu *active_menu)
                         break;
                 }
         }
+
+        list_del(trail.prev);
 }
 
 static int show_textbox_ext(const char *title, char *text, int r, int c, int
@@ -884,6 +952,7 @@ static int handle_exit(void)
         int res;
 
         save_and_exit = 1;
+        reset_subtitle();
         dialog_clear();
         if (conf_get_changed())
                 res = dialog_yesno(NULL,