[PATCH v7 05/10] git-clean: interactive cleaning by select numbers

[Jiang Xin <worldhello.net@gmail.com>]

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.net@gmail.com>
---
 builtin/clean.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/builtin/clean.c b/builtin/clean.c
index 10f3..75e37 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -684,6 +684,43 @@ static int edit_by_patterns_cmd()
 	return 0;
 }
 
+static int edit_by_numbers_cmd()
+{
+	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 = "Select items to delete";
+	menu_opts.flag = 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 (EOF), won't delete */
+			*(items[i].string) = '\0';
+		}
+	}
+
+	string_list_remove_empty_items(&del_list, 0);
+
+	free(chosen);
+	return 0;
+}
+
 static int quit_cmd()
 {
 	string_list_clear(&del_list, 0);
@@ -697,6 +734,7 @@ static int help_cmd(int x)
 	printf_ln(_(
 		    "clean            - start cleaning\n"
 		    "edit by patterns - exclude items from deletion\n"
+		    "edit by numbers  - select items to be deleted by numbers\n"
 		    "quit             - stop cleaning\n"
 		    "help             - this screen\n"
 		    "?                - help for prompt selection"
@@ -714,6 +752,7 @@ static void interactive_main_loop()
 		struct menu_item menus[] = {
 			{'c', "clean",			0, clean_cmd},
 			{'p', "edit by patterns",	0, edit_by_patterns_cmd},
+			{'n', "edit by numbers",	0, edit_by_numbers_cmd},
 			{'q', "quit",			0, quit_cmd},
 			{'h', "help",			0, help_cmd},
 		};
-- 
1.8.3.rc1.341.g1c24ab7