Create a better reflog. Follows the discussion in
https://lore.kernel.org/git/akZfm-igZKeHaDST@pks.im/.

The reflog of HEAD records the work done on every branch, so "git reflog"
mixes them and does not say which entry was made on which branch. This adds
a "%gb" placeholder that names the branch HEAD was on when each entry was
recorded:

$ git log -g --format='%h %gd: (%gb) %gs'
9c8d7e6 HEAD@{0}: (topic) rebase (finish): returning to refs/heads/topic
1a2b3c4 HEAD@{2}: (topic) rebase (start): checkout main
1a2b3c4 HEAD@{3}: (main) commit: fix typo

It follows branch switches, branch renames and rebases, including "git
rebase ", rebases of a detached HEAD and rebases of a branch that was
already up to date. When HEAD was detached, the entry shows "detached at ".

Changes in v3:

 * Dropped --operations.
 * Replaced --historical-branch with a %gb placeholder for --format, e.g.
   git log -g --format='%h %gd: (%gb) %gs'.
 * %gb names the right branch after git rebase <upstream> <branch>, a rebase
   of a detached HEAD and an up-to-date rebase.
 * Named the returning to and checkout reflog strings in reflog.h too.

Changes in v2:

 * Move the "historical branch" rightward in the display for cleaner
   alignment.
 * Improve commit messages.

Harald Nordgren (2):
  reflog: name the strings that mark switches, renames and rebase steps
  pretty: add %gb to name the branch of each reflog entry

 Documentation/pretty-formats.adoc |   3 +
 builtin/branch.c                  |   3 +-
 builtin/checkout.c                |   3 +-
 builtin/rebase.c                  |  19 ++--
 object-name.c                     |   3 +-
 pretty.c                          |   4 +
 reflog-walk.c                     | 156 ++++++++++++++++++++++++++++--
 reflog-walk.h                     |   2 +
 reflog.h                          |   8 ++
 sequencer.c                       |  13 +--
 t/t1414-reflog-walk.sh            | 122 +++++++++++++++++++++++
 wt-status.c                       |   3 +-
 12 files changed, 314 insertions(+), 25 deletions(-)

base-commit: 7e34d8174dcda3435d1404c9a30bef46afe6c13e

Submitted-As: https://lore.kernel.org/git/pull.2448.v3.git.git.1793090327.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.2448.git.git.1792070038.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.2448.v2.git.git.1792348037.gitgitgadget@gmail.com