[WIP PATCH 0/5] support --exclude for diff/log commands

This is not really ready for review or use, but I'd like to have feedback if any, where this series is heading because it requires some code refactor in diff/rev machinery. It does not feel absolutely right to me.

On the other hand, if we go with ':' as a mark of special pathspecs, then

 - ":/" mark pathspecs relative to worktree root
 - ":!" may mark negative pathspecs

Less changes in diff/rev this way.

Nguyễn Thái Ngọc Duy (5):
  tree-walk: support negative pathspec
  match_pathspec_depth: support negative pathspec

match_pathspec_depth needs work. tree_entry_interesting() can use some optimization, but leave it for now.

  revision.c: get rid of struct rev_info.prune_data
  diff: refactor init/release API

These two facilitate post pathspec manipulation to transform --exclude to pathspecs with to_exclude = 1.

  diff: support --exclude

 Documentation/technical/api-diff.txt |    2 +-
 builtin/add.c                        |    3 +-
 builtin/blame.c                      |   22 +++++----------
 builtin/diff.c                       |    6 ++--
 builtin/fast-export.c                |    2 +-
 builtin/merge.c                      |    2 +-
 builtin/reset.c                      |    4 +-
 cache.h                              |    1 +
 diff-lib.c                           |    6 ++--
 diff-no-index.c                      |    6 ++--
 diff.c                               |   49 ++++++++++++++++++++++++++++++++-
 diff.h                               |    6 ++--
 dir.c                                |    5 +++
 merge-recursive.c                    |    2 +-
 notes-merge.c                        |    8 +++---
 patch-ids.c                          |    2 +-
 revision.c                           |   22 ++++++++-------
 revision.h                           |    1 -
 tree-diff.c                          |   21 +++------------
 tree-walk.c                          |   37 +++++++++++++++++++------
 wt-status.c                          |    6 +---
 21 files changed, 130 insertions(+), 83 deletions(-)