[PATCH 00/14] format-patch: add --interdiff and --range-diff options

[Eric Sunshine <sunshine@sunshineco.com>]

When re-submitting a patch series, it is often helpful (for reviewers)
to include an interdiff or range-diff against the previous version.
Doing so requires manually running git-diff or git-range-diff and
copy/pasting the result into the cover letter of the new version.

This series automates the process by introducing git-format-patch
options --interdiff and --range-diff which insert such a diff into the
cover-letter or into the commentary section of the lone patch of a
1-patch series. In the latter case, the interdiff or range-diff is
indented to avoid confusing git-am and human readers.

Patches 1-6 add --interdiff and can apply directly on 'master'.
Patches 7-14 add --range-diff and apply atop js/range-diff v4[1].

An earlier RFC[2] implemented only --range-diff, and only for the
cover-letter.

Changes since the RFC:

* add --interdiff option for cover-letter and lone patch

* based on js/range-diff v4[1]

* --range-diff works with lone patch (no longer limited to cover
  letter)

* --range-diff colors output when used with --stdout, just as patches
  themselves are already colored

* --range-diff takes advantage of libified range-diff mechanism in v4
  rather than invoking git-range-diff command

No interdiff or range-diff is included in this cover-letter since the
implementation changed dramatically.

[1]: https://public-inbox.org/git/pull.1.v4.git.gitgitgadget@gmail.com/
[2]: https://public-inbox.org/git/20180530080325.37520-1-sunshine@sunshineco.com/

Eric Sunshine (14):
  format-patch: allow additional generated content in
    make_cover_letter()
  format-patch: add --interdiff option to embed diff in cover letter
  format-patch: teach --interdiff to respect -v/--reroll-count
  interdiff: teach show_interdiff() to indent interdiff
  log-tree: show_log: make commentary block delimiting reusable
  format-patch: allow --interdiff to apply to a lone-patch
  range-diff: respect diff_option.file rather than assuming 'stdout'
  range-diff: publish default creation factor
  range-diff: relieve callers of low-level configuration burden
  format-patch: add --range-diff option to embed diff in cover letter
  format-patch: extend --range-diff to accept revision range
  format-patch: teach --range-diff to respect -v/--reroll-count
  format-patch: add --creation-factor tweak for --range-diff
  format-patch: allow --range-diff to apply to a lone-patch

 Documentation/git-format-patch.txt |  29 ++++++
 Makefile                           |   1 +
 builtin/log.c                      | 139 ++++++++++++++++++++++++-----
 builtin/range-diff.c               |  25 ++----
 interdiff.c                        |  28 ++++++
 interdiff.h                        |   8 ++
 log-tree.c                         |  52 +++++++++--
 range-diff.c                       |  26 +++++-
 range-diff.h                       |   5 +-
 revision.h                         |  11 +++
 t/t3206-range-diff.sh              |  12 +++
 t/t4014-format-patch.sh            |  34 +++++++
 12 files changed, 319 insertions(+), 51 deletions(-)
 create mode 100644 interdiff.c
 create mode 100644 interdiff.h

-- 
2.18.0.345.g5c9ce644c3