If menuconfig have a Save button like alternative
.config editors, xconfig, nconfig, etc.We will have
a obvious benefit when use menuconfig just like
when we use others, we can save our .config quickly
and conveniently.

This patch add the Save button for menuconfig.

V1-V2: Rewrite the most code to make it more correct
V2-V3: Fix the behavior of conf_message_callback when exit.
V3-V4:
1: Move Buttons a little left to make them look like symmetrical.
2: Exchange the position between Save button and Exit button.
3: Use conf_save instead of conf_write to make we can save
an alternate configuration file with Save button.

Signed-off-by: Wang YanQing <udkni...@gmail.com>
---
 scripts/kconfig/lxdialog/menubox.c | 21 +++++++++---------
 scripts/kconfig/mconf.c            | 45 ++++++++++++++++++++++++++++++--------
 2 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/scripts/kconfig/lxdialog/menubox.c 
b/scripts/kconfig/lxdialog/menubox.c
index 1d60473..b445bda 100644
--- a/scripts/kconfig/lxdialog/menubox.c
+++ b/scripts/kconfig/lxdialog/menubox.c
@@ -26,7 +26,7 @@
  *
  *    *)  A bugfix for the Page-Down problem
  *
- *    *)  Formerly when I used Page Down and Page Up, the cursor would be set 
+ *    *)  Formerly when I used Page Down and Page Up, the cursor would be set
  *        to the first position in the menu box.  Now lxdialog is a bit
  *        smarter and works more like other menu systems (just have a look at
  *        it).
@@ -154,12 +154,13 @@ static void print_arrows(WINDOW * win, int item_no, int 
scroll, int y, int x,
  */
 static void print_buttons(WINDOW * win, int height, int width, int selected)
 {
-       int x = width / 2 - 16;
+       int x = width / 2 - 20;
        int y = height - 2;
 
        print_button(win, gettext("Select"), y, x, selected == 0);
-       print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
+       print_button(win, gettext(" Save "), y, x + 12, selected == 1);
        print_button(win, gettext(" Help "), y, x + 24, selected == 2);
+       print_button(win, gettext(" Exit "), y, x + 36, selected == 3);
 
        wmove(win, y, x + 1 + 12 * selected);
        wrefresh(win);
@@ -372,7 +373,7 @@ do_resize:
                case TAB:
                case KEY_RIGHT:
                        button = ((key == KEY_LEFT ? --button : ++button) < 0)
-                           ? 2 : (button > 2 ? 0 : button);
+                           ? 3 : (button > 3 ? 0 : button);
 
                        print_buttons(dialog, height, width, button);
                        wrefresh(menu);
@@ -399,17 +400,17 @@ do_resize:
                                return 2;
                        case 's':
                        case 'y':
-                               return 3;
-                       case 'n':
                                return 4;
-                       case 'm':
+                       case 'n':
                                return 5;
-                       case ' ':
+                       case 'm':
                                return 6;
-                       case '/':
+                       case ' ':
                                return 7;
-                       case 'z':
+                       case '/':
                                return 8;
+                       case 'z':
+                               return 9;
                        case '\n':
                                return button;
                        }
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 53975cf..a8a1947 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -280,6 +280,7 @@ static struct menu *current_menu;
 static int child_count;
 static int single_menu_mode;
 static int show_all_options;
+static int save_and_exit;
 
 static void conf(struct menu *menu, struct menu *active_menu);
 static void conf_choice(struct menu *menu);
@@ -584,6 +585,7 @@ static void conf(struct menu *menu, struct menu 
*active_menu)
        const char *prompt = menu_get_prompt(menu);
        struct symbol *sym;
        int res;
+       int yesno;
        int s_scroll = 0;
 
        while (1) {
@@ -604,7 +606,7 @@ static void conf(struct menu *menu, struct menu 
*active_menu)
                res = dialog_menu(prompt ? _(prompt) : _("Main Menu"),
                                  _(menu_instructions),
                                  active_menu, &s_scroll);
-               if (res == 1 || res == KEY_ESC || res == -ERRDISPLAYTOOSMALL)
+               if (res == 3 || res == KEY_ESC || res == -ERRDISPLAYTOOSMALL)
                        break;
                if (!item_activate_selected())
                        continue;
@@ -644,13 +646,27 @@ static void conf(struct menu *menu, struct menu 
*active_menu)
                                break;
                        }
                        break;
+               case 1:
+                       if (!conf_get_changed()) {
+                               break;
+                       }
+
+                       yesno = dialog_yesno(NULL,
+                                       _("Do you wish to save your "
+                                               "new configuration?\n"
+                                               "<ESC><ESC> to continue."),
+                                       6, 60);
+                       if (yesno == 0) {
+                           conf_save();
+                       }
+                       break;
                case 2:
                        if (sym)
                                show_help(submenu);
                        else
                                show_helptext(_("README"), _(mconf_readme));
                        break;
-               case 3:
+               case 4:
                        if (item_is_tag('t')) {
                                if (sym_set_tristate_value(sym, yes))
                                        break;
@@ -658,24 +674,24 @@ static void conf(struct menu *menu, struct menu 
*active_menu)
                                        show_textbox(NULL, setmod_text, 6, 74);
                        }
                        break;
-               case 4:
+               case 5:
                        if (item_is_tag('t'))
                                sym_set_tristate_value(sym, no);
                        break;
-               case 5:
+               case 6:
                        if (item_is_tag('t'))
                                sym_set_tristate_value(sym, mod);
                        break;
-               case 6:
+               case 7:
                        if (item_is_tag('t'))
                                sym_toggle_tristate_value(sym);
                        else if (item_is_tag('m'))
                                conf(submenu, NULL);
                        break;
-               case 7:
+               case 8:
                        search_conf();
                        break;
-               case 8:
+               case 9:
                        show_all_options = !show_all_options;
                        break;
                }
@@ -702,6 +718,17 @@ static void show_helptext(const char *title, const char 
*text)
        show_textbox(title, text, 0, 0);
 }
 
+static void conf_message_callback(const char *fmt, va_list ap)
+{
+       char buf[1024];
+
+       vsnprintf(buf, sizeof(buf), fmt, ap);
+       if (save_and_exit)
+               printf("%s", buf);
+       else
+               show_textbox(NULL, buf, 6, 60);
+}
+
 static void show_help(struct menu *menu)
 {
        struct gstr help = str_new();
@@ -869,7 +896,7 @@ static void conf_save(void)
 static int handle_exit(void)
 {
        int res;
-
+       save_and_exit = 1;
        dialog_clear();
        if (conf_get_changed())
                res = dialog_yesno(NULL,
@@ -941,6 +968,7 @@ int main(int ac, char **av)
        }
 
        set_config_filename(conf_get_configname());
+       conf_set_message_callback(conf_message_callback);
        do {
                conf(&rootmenu, NULL);
                res = handle_exit();
@@ -948,4 +976,3 @@ int main(int ac, char **av)
 
        return res;
 }
-
-- 
1.7.11.1.116.g8228a23
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