Draw a multiple choice menu using `list_and_choose` to select items
to be deleted by numbers.

User can input:

 *  1,5-7 : select 1,5,6,7 items to be deleted
 *  *     : select all items to be deleted
 *  -*    : unselect all, nothing will be deleted
 *        : (empty) finish selecting, and return back to main menu

Signed-off-by: Jiang Xin <worldhello....@gmail.com>
---
 builtin/clean.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/builtin/clean.c b/builtin/clean.c
index 35b9f3..96a5bb 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -673,6 +673,43 @@ static int filter_by_patterns_cmd(void)
        return 0;
 }
 
+static int select_by_numbers_cmd(void)
+{
+       struct menu_opts menu_opts;
+       struct menu_stuff menu_stuff;
+       struct string_list_item *items;
+       int *chosen;
+       int i, j;
+
+       menu_opts.header = NULL;
+       menu_opts.prompt = N_("Select items to delete");
+       menu_opts.flags = 0;
+
+       menu_stuff.type = MENU_STUFF_TYPE_STRING_LIST;
+       menu_stuff.stuff = &del_list;
+       menu_stuff.nr = del_list.nr;
+
+       chosen = list_and_choose(&menu_opts, &menu_stuff);
+       items = del_list.items;
+       for(i = 0, j = 0; i < del_list.nr; i++) {
+               if (i < chosen[j]) {
+                       *(items[i].string) = '\0';
+               } else if (i == chosen[j]) {
+                       /* delete selected item */
+                       j++;
+                       continue;
+               } else {
+                       /* end of chosen (chosen[j] == EOF), won't delete */
+                       *(items[i].string) = '\0';
+               }
+       }
+
+       string_list_remove_empty_items(&del_list, 0);
+
+       free(chosen);
+       return 0;
+}
+
 static int quit_cmd(void)
 {
        string_list_clear(&del_list, 0);
@@ -686,6 +723,7 @@ static int help_cmd(void)
        printf_ln(_(
                    "clean               - start cleaning\n"
                    "filter by pattern   - exclude items from deletion\n"
+                   "select by numbers   - select items to be deleted by 
numbers\n"
                    "quit                - stop cleaning\n"
                    "help                - this screen\n"
                    "?                   - help for prompt selection"
@@ -702,6 +740,7 @@ static void interactive_main_loop(void)
                struct menu_item menus[] = {
                        {'c', "clean",                  0, clean_cmd},
                        {'f', "filter by pattern",      0, 
filter_by_patterns_cmd},
+                       {'s', "select by numbers",      0, 
select_by_numbers_cmd},
                        {'q', "quit",                   0, quit_cmd},
                        {'h', "help",                   0, help_cmd},
                };
-- 
1.8.3.rc1.407.g762149a

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