[PATCH v8 00/12] Interactive git clean

Updates since v7 series:

 * Eliminate global variable "**the_prefix".
 * Save relative paths in del_list.
 * Split 1/10 of v7 into 3 patches for readability.
 * Change orders of patches, thanks to Eric.
 * Update menu and hotkeys with the help of Eric.

Usage:

When the command enters the interactive mode, it shows the files and directories to be cleaned, and goes into its interactive command loop.

The command loop shows the list of subcommands available, and gives a prompt "What now> ". In general, when the prompt ends with a single '>', you can pick only one of the choices given and type return, like this:

    *** Commands ***
      1: clean         2: filter by pattern     3: select by numbers
      4. ask each      5. toggle flags: none    6. quit
      7: help
    What now> 2

You also could say `c` or `clean` above as long as the choice is unique.

The main command loop has 7 subcommands.

clean::

   Start cleaning files and directories, and then quit.

filter by pattern::

   This shows the files and directories to be deleted and issues an
   "Input ignore patterns>>" prompt. You can input space-seperated
   patterns to exclude files and directories from deletion.
   E.g. "*.c *.h" will excludes files end with ".c" and ".h" from
   deletion. When you are satisfied with the filtered result, press
   ENTER (empty) back to the main menu.

select by numbers::

   This shows the files and directories to be deleted and issues an
   "Select items to delete>>" prompt. When the prompt ends with double
   '>>' like this, you can make more than one selection, concatenated
   with whitespace or comma.  Also you can say ranges.  E.g. "2-5 7,9"
   to choose 2,3,4,5,7,9 from the list.  If the second number in a
   range is omitted, all remaining patches are taken.  E.g. "7-" to
   choose 7,8,9 from the list.  You can say '*' to choose everything.
   Also when you are satisfied with the filtered result, press ENTER
   (empty) back to the main menu.

ask each::

  This will start to clean, and you must confirm one by one in order
  to delete items. Please note that this action is not as efficient
  as the above two actions.

toggle flags::

  This lets you change the flags for git-clean, such as -x/-X/-d/-ff,
  and refresh the cleaning candidates list automatically.

quit::

  This lets you quit without do cleaning.

help::

  Show brief usage of interactive git-clean.

Jiang Xin (12):
  git-clean refactor: hold cleaning items in del_list
  git-clean: add support for -i/--interactive
  git-clean: show items of del_list in columns
  git-clean: add colors to interactive git-clean
  git-clean: use a git-add-interactive compatible UI
  git-clean: add filter by pattern interactive action
  git-clean: add select by numbers interactive action
  git-clean: add ask each interactive action
  git-clean refactor: save some options in clean_flags
  git-clean refactor: add wrapper scan_clean_candidates
  git-clean: add toggle flags interactive action
  git-clean: update document for interactive git-clean

 Documentation/config.txt    |    4 +
 Documentation/git-clean.txt |   77 +++-
 builtin/clean.c             | 1019 +++++++++++++++++++++++++++++++++++++++----
 3 files changed, 1023 insertions(+), 77 deletions(-)