[RFC PATCH 0/9][Outreachy] rebase -i: add options to fixup command

Hi Everyone,

This patch series adds fixup [-C|-c] options to interactive rebase. In addition to amending the contents of the commit as the `fixup` command does now, `fixup -C` replaces the commit message of the original commit which we are fixing up with the message of the fixup commit. And to edit the fixup commit message before committing, `fixup -c` command is used instead of `fixup -C`. This convention is similar to the existing `merge` command in the interactive rebase, that also supports `-c` and `-C` options with similar meanings.

This patch series also changes `rebase -i --autosquash` to rearrange commits whose message starts with "amend!" and replaces the pick command with `fixup -C`. The creation of "amend!" commits will be rebase -i: add options to fixup command added in another patch series.

This is done in reference to the issue opened by Dscho as here[1] and further discussed briefly[2]. Also, there is discussion[3] regarding the implementation of reword! commit. The past patches of Phillip Wood’s work[4], implements 'reword!' as 'amend!' in git rebase and these patches uses those as the initial base. And to avoid the extra command in the interactive rebase, this patch series instead add options to the current fixup command in interactive rebase (fixup [-C | -c]) as discussed earlier[5].

Looking forward for the reviews.

Thanks and Regards, Charvi

P.S - I thanks Christian and Phillip for mentoring in this project and happy to work in community.

[1] https://github.com/gitgitgadget/git/issues/259 [2] https://public-inbox.org/git/alpine.DEB.2.21.1.1710151754070.40514@virtualbox/ [3] https://lore.kernel.org/git/95cc6fb2-d1bc-11de-febe-c2b5c78a6850@gmail.com/ [4] https://github.com/phillipwood/git/commits/wip/rebase-amend [5] https://lore.kernel.org/git/29fc2f59-1cca-a3db-5586-bbd7b2e4806d@gmail.com/

Charvi Mendiratta (6):
  sequencer: pass todo_item to do_pick_commit()
  sequencer: use const variable for commit message comments
  rebase -i: add fixup [-C | -c] command
  t3437: test script for fixup [-C|-c] options in interactive rebase
  rebase -i: teach --autosquash to work with amend!
  doc/git-rebase: add documentation for fixup [-C|-c] options

Phillip Wood (3):
  rebase -i: only write fixup-message when it's needed
  sequencer: factor out code to append squash message
  rebase -i: comment out squash!/fixup! subjects from squash message

 Documentation/git-rebase.txt    |  12 +-
 rebase-interactive.c            |   4 +-
 sequencer.c                     | 307 +++++++++++++++++++++++++++-----
 t/lib-rebase.sh                 |   4 +
 t/t3415-rebase-autosquash.sh    |  27 ++-
 t/t3437-rebase-fixup-options.sh | 202 +++++++++++++++++++++
 t/t3437/expected-squash-message |  51 ++++++
 t/t3900-i18n-commit.sh          |   4 -
 8 files changed, 549 insertions(+), 62 deletions(-)
 create mode 100755 t/t3437-rebase-fixup-options.sh
 create mode 100644 t/t3437/expected-squash-message

-- 2.29.0.rc1