[PATCH] rebase -i: fixup fixup! fixup!

[Andrew Pimlott <andrew@pimlott.net>]

Excerpts from Thomas Rast's message of Tue Jun 11 11:50:07 -0700 2013:
> Andrew Pimlott <andrew@pimlott.net> writes:
> >     git commit -m 'fix nasty bug'
> >     ...
> >     git commit --fixup :/nasty
> >     ...
> >     git commit --fixup :/nasty
> >
> > The second :/nasty resolves to the previous fixup, not the initial
> > commit.  I could have made the regular expression more precise, but this
> > would be a hassle.
> >
> > Would a change to support fixup! fixup! be considered?
> 
> Sure, why not.  You could start with something like the patch below
> (untested).  If that happens to work, just add a test and a good commit
> message.

It happened to work and I added a test.  But then it occurred to me that
it might have been better to fix commit --fixup/--squash to strip the
fixup! or squash! from the referenced commit in the first place.
Anyhow, below is my patch for --autosquash, but unles someone has an
objection to doing it in commit, I'll work on that.

Andrew

Ignore subsequent "fixup! " or "squash! " after the first.  Handy in case a
git commit --fixup/--squash referred to a previous fixup/squash instead of
the original commit, for example with :/msg.

Signed-off-by: Andrew Pimlott <andrew@pimlott.net>
---
 Documentation/git-rebase.txt |    4 +++-
 git-rebase--interactive.sh   |   13 ++++++++++-
 t/t3415-rebase-autosquash.sh |   49 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index c84854a..725cf27 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -389,7 +389,9 @@ squash/fixup series.
 	the same ..., automatically modify the todo list of rebase -i
 	so that the commit marked for squashing comes right after the
 	commit to be modified, and change the action of the moved
-	commit from `pick` to `squash` (or `fixup`).
+	commit from `pick` to `squash` (or `fixup`).  Ignores subsequent
+	"fixup! " or "squash! " after the first, in case you referred to a
+	previous fixup/squash with `git commit --fixup/--squash`.
 +
 This option is only valid when the '--interactive' option is used.
 +
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index f953d8d..54ed4c3 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -689,7 +689,18 @@ rearrange_squash () {
 		case "$message" in
 		"squash! "*|"fixup! "*)
 			action="${message%%!*}"
-			rest="${message#*! }"
+			rest=$message
+			# ignore any squash! or fixup! after the first
+			while : ; do
+				case "$rest" in
+				"squash! "*|"fixup! "*)
+					rest="${rest#*! }"
+					;;
+				*)
+					break
+					;;
+				esac
+			done
 			echo "$sha1 $action $rest"
 			# if it's a single word, try to resolve to a full sha1 and
 			# emit a second copy. This allows us to match on both message
diff --git a/t/t3415-rebase-autosquash.sh b/t/t3415-rebase-autosquash.sh
index a1e86c4..1a3f40a 100755
--- a/t/t3415-rebase-autosquash.sh
+++ b/t/t3415-rebase-autosquash.sh
@@ -193,4 +193,53 @@ test_expect_success 'use commit --squash' '
 	test_auto_commit_flags squash 2
 '
 
+test_auto_fixup_fixup () {
+	git reset --hard base &&
+	echo 1 >file1 &&
+	git add -u &&
+	test_tick &&
+	git commit -m "$1! first" &&
+	echo 2 >file1 &&
+	git add -u &&
+	test_tick &&
+	git commit -m "$1! $2! first" &&
+	git tag "final-$1-$2" &&
+	test_tick &&
+	git rebase --autosquash -i HEAD^^^^ &&
+	git log --oneline >actual &&
+	test_pause &&
+	if [ "$1" = "fixup" ]; then
+		test_line_count = 3 actual
+	elif [ "$1" = "squash" ]; then
+		test_line_count = 4 actual
+	else
+		false
+	fi &&
+	git diff --exit-code "final-$1-$2" &&
+	test 2 = "$(git cat-file blob HEAD^:file1)" &&
+	if [ "$1" = "fixup" ]; then
+		test 1 = $(git cat-file commit HEAD^ | grep first | wc -l)
+	elif [ "$1" = "squash" ]; then
+		test 3 = $(git cat-file commit HEAD^ | grep first | wc -l)
+	else
+		false
+	fi
+}
+
+test_expect_success 'fixup! fixup!' '
+	test_auto_fixup_fixup fixup fixup
+'
+
+test_expect_success 'fixup! squash!' '
+	test_auto_fixup_fixup fixup squash
+'
+
+test_expect_success 'squash! squash!' '
+	test_auto_fixup_fixup squash squash
+'
+
+test_expect_success 'squash! fixup!' '
+	test_auto_fixup_fixup squash fixup
+'
+
 test_done
-- 
1.7.10.4