[PATCH 00/22] Prepare the sequencer for the upcoming rebase -i patches

This patch series marks the  '4' in the countdown to speed up rebase -i
by implementing large parts in C. It is based on the `libify-sequencer`
patch series that I submitted last week.

The patches in this series merely prepare the sequencer code for the
next patch series that actually teaches the sequencer to run an
interactive rebase.

The reason to split these two patch series is simple: to keep them at a
sensible size.

The two patch series after that are much smaller: a two-patch "series"
that switches rebase -i to use the sequencer (except with --root or
--preserve-merges), and a couple of patches to move several pretty
expensive script processing steps to C (think: autosquash).

The end game of this patch series is a git-rebase--helper that makes
rebase -i 5x faster on Windows (according to t/perf/p3404). Travis says
that even MacOSX and Linux benefit (4x and 3x, respectively).

I have been working on this since early February, whenever time allowed,
and it is time to put it into the users' hands. To that end, I will most
likely submit the remaining three patch series in the next two days, and
integrate the whole shebang into Git for Windows 2.10.0.

Therefore I would be most grateful for every in-depth review.


Johannes Schindelin (22):
  sequencer: use static initializers for replay_opts
  sequencer: use memoized sequencer directory path
  sequencer: avoid unnecessary indirection
  sequencer: future-proof remove_sequencer_state()
  sequencer: allow the sequencer to take custody of malloc()ed data
  sequencer: release memory that was allocated when reading options
  sequencer: future-proof read_populate_todo()
  sequencer: remove overzealous assumption
  sequencer: completely revamp the "todo" script parsing
  sequencer: avoid completely different messages for different actions
  sequencer: get rid of the subcommand field
  sequencer: refactor the code to obtain a short commit name
  sequencer: remember the onelines when parsing the todo file
  sequencer: prepare for rebase -i's commit functionality
  sequencer: introduce a helper to read files written by scripts
  sequencer: prepare for rebase -i's GPG settings
  sequencer: allow editing the commit message on a case-by-case basis
  sequencer: support amending commits
  sequencer: support cleaning up commit messages
  sequencer: remember do_recursive_merge()'s return value
  sequencer: left-trim the lines read from the script
  sequencer: refactor write_message()

 builtin/commit.c                |   2 +-
 builtin/revert.c                |  42 ++-
 sequencer.c                     | 573 +++++++++++++++++++++++++++-------------
 sequencer.h                     |  27 +-
 t/t3510-cherry-pick-sequence.sh |  11 -
 5 files changed, 428 insertions(+), 227 deletions(-)

Based-On: libify-sequencer at https://github.com/dscho/git
Fetch-Base-Via: git fetch https://github.com/dscho/git libify-sequencer
Published-As: https://github.com/dscho/git/releases/tag/prepare-sequencer-v1
Fetch-It-Via: git fetch https://github.com/dscho/git prepare-sequencer-v1

-- 
2.10.0.rc1.114.g2bd6b38

base-commit: 2d6d71e2a2d410b12d783f0a8edd22791f303c12