[RFC/PATCH 0/8] Untracked cache improvements

Following the discussions on the "config: add core.trustmtime"
patch I previously sent, here is a patch series that tries to
improve the untracked cache feature.

This patch series implements core.untrackedCache instead of
core.trustmtime. core.untrackedCache is more complex because
basically when it's set to true git should always try to use
the untracked cache, and when set to false git should never
use it.

Patchs 1/8 and 2/8 add some features that are missing.
Patchs 3/8, 4/8 and 5/8 are some refactoring to prepare for
patch 6/8 which implements core.untrackedCache.

Up to patch 6/8 backward compatibility is preserved.
Patchs 7/8 and 8/8 are trying to improve usability by making
the untracked cache cli and config options more in line with
other git cli and config options, but this sacrifies some
backward compatibility.

Christian Couder (8):
  update-index: add untracked cache notifications
  update-index: add --test-untracked-cache
  update-index: move 'uc' var declaration
  dir: add add_untracked_cache()
  dir: add remove_untracked_cache()
  config: add core.untrackedCache
  update-index: prevent --untracked-cache from performing tests
  update-index: make core.untrackedCache a bool

 Documentation/config.txt               | 10 +++++++++
 Documentation/git-update-index.txt     | 30 +++++++++++++++++++-------
 builtin/update-index.c                 | 39 ++++++++++++++++------------------
 cache.h                                |  1 +
 config.c                               |  4 ++++
 contrib/completion/git-completion.bash |  1 +
 dir.c                                  | 22 ++++++++++++++++++-
 dir.h                                  |  2 ++
 environment.c                          |  1 +
 t/t7063-status-untracked-cache.sh      |  2 +-
 wt-status.c                            |  9 ++++++++
 11 files changed, 90 insertions(+), 31 deletions(-)

-- 
2.6.3.391.g95a3a5c