[PATCH v2 0/9] diff-merges: let -m imply -p

[Sergey Organov <sorganov@gmail.com>]

Fix long standing inconsistency between -c/--cc that do imply -p, on
one side, and -m that did not imply -p, on the other side.

Only the last patch is the actual functional change. The rest of
patches are additional tests and refactorings that are not expected to
alter existing behaviors.

After these patches

  git log -m

produces diffs without need to provide -p as well, that improves both
consistency and usability. It gets even more useful if one sets
"log.diffMerges" configuration variable to "first-parent" to force -m
produce usual diff with respect to first parent only.

These series, however, don't change behavior when specific diff format
is explicitly provided on the command-line, so that commands like

  git log -m --raw
  git log -m --stat

are not affected.

Exact historical semantics of -m is still provided by
--diff-merges=separate.

Updates in v2:

  * Fix style and typos in descriptions

Updates in v1:

  * Stop parsing distinct diff-index options beforehand, as it could
    cause unexpected behaviors. Implement different strategy to avoid
    clash of diff-index "-m" and diff-merges "-m".

  * Added tests for "git log -m --raw" and "git log -m".

Sergey Organov (9):
  t4013: test that "-m" alone has no effect in "git log"
  t4013: test "git log -m --raw"
  t4013: test "git log -m --stat"
  t4013: test "git diff-index -m"
  diff-merges: move specific diff-index "-m" handling to diff-index
  git-svn: stop passing "-m" to "git rev-list"
  stash list: stop passing "-m" to "git log"
  diff-merges: rename "combined_imply_patch" to "merges_imply_patch"
  diff-merges: let "-m" imply "-p"

 Documentation/diff-options.txt    |  8 ++--
 builtin/diff-index.c              |  9 +++++
 builtin/stash.c                   |  2 +-
 diff-merges.c                     | 36 +++++++++--------
 diff-merges.h                     |  2 +
 perl/Git/SVN.pm                   |  2 +-
 revision.h                        |  2 +-
 t/t3903-stash.sh                  |  2 +-
 t/t4013-diff-various.sh           | 23 +++++++++++
 t/t4013/diff.log_-m_--raw_master  | 61 ++++++++++++++++++++++++++++
 t/t4013/diff.log_-m_--stat_master | 66 +++++++++++++++++++++++++++++++
 11 files changed, 188 insertions(+), 25 deletions(-)
 create mode 100644 t/t4013/diff.log_-m_--raw_master
 create mode 100644 t/t4013/diff.log_-m_--stat_master

Interdiff against v1:
-- 
2.25.1