[PATCH v2 5/6] status: do not depend on rebase reflog messages

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b397ea4 (status: show more info than "currently not on any branch",
2013-03-13) made the output of 'git status' richer in the case of a
detached HEAD.  Before this patch, with a detached HEAD:

  $ git status
  # Not currently on any branch.

After the patch:

  $ git checkout v1.8.2
  $ git status
  # HEAD detached at v1.8.2.

It works by digging the reflog for the most recent message of the form
"checkout: moving from xxxx to yyyy".  It then asserts that HEAD and
"yyyy" are the same, and displays this message.  When they aren't equal,
it displays:

  $ git status
  # HEAD detached from fe11db.

In case of a rebase [-i] operation in progress, this message depends on
the implementation of rebase writing "checkout: " messages to the
reflog.  To remove this dependency so that rebase can be updated to
write better reflog messages, replace this "HEAD detached from" message
with the constant:

  # rebase in progress; onto $ONTO

The issue is not isolated to rebase at all.  Several other scripts like
bisect write "checkout: " messages to the reflog, and the tests in
t/status-help depend on them.  Fixing them is left as an exercise to
other contributors.

Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
 t/t7512-status-help.sh | 37 +++++++++++++++++--------------------
 wt-status.c            |  5 ++++-
 2 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/t/t7512-status-help.sh b/t/t7512-status-help.sh
index bf08d4e..739624e 100755
--- a/t/t7512-status-help.sh
+++ b/t/t7512-status-help.sh
@@ -77,7 +77,7 @@ test_expect_success 'status when rebase in progress before resolving conflicts'
 	ONTO=$(git rev-parse --short HEAD^^) &&
 	test_must_fail git rebase HEAD^ --onto HEAD^^ &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently rebasing branch '\''rebase_conflicts'\'' on '\''$ONTO'\''.
 	#   (fix conflicts and then run "git rebase --continue")
 	#   (use "git rebase --skip" to skip this patch)
@@ -104,7 +104,7 @@ test_expect_success 'status when rebase in progress before rebase --continue' '
 	echo three >main.txt &&
 	git add main.txt &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently rebasing branch '\''rebase_conflicts'\'' on '\''$ONTO'\''.
 	#   (all conflicts fixed: run "git rebase --continue")
 	#
@@ -136,7 +136,7 @@ test_expect_success 'status during rebase -i when conflicts unresolved' '
 	ONTO=$(git rev-parse --short rebase_i_conflicts) &&
 	test_must_fail git rebase -i rebase_i_conflicts &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently rebasing branch '\''rebase_i_conflicts_second'\'' on '\''$ONTO'\''.
 	#   (fix conflicts and then run "git rebase --continue")
 	#   (use "git rebase --skip" to skip this patch)
@@ -162,7 +162,7 @@ test_expect_success 'status during rebase -i after resolving conflicts' '
 	test_must_fail git rebase -i rebase_i_conflicts &&
 	git add main.txt &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently rebasing branch '\''rebase_i_conflicts_second'\'' on '\''$ONTO'\''.
 	#   (all conflicts fixed: run "git rebase --continue")
 	#
@@ -188,10 +188,9 @@ test_expect_success 'status when rebasing -i in edit mode' '
 	export FAKE_LINES &&
 	test_when_finished "git rebase --abort" &&
 	ONTO=$(git rev-parse --short HEAD~2) &&
-	TGT=$(git rev-parse --short two_rebase_i) &&
 	git rebase -i HEAD~2 &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $TGT
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''rebase_i_edit'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -216,9 +215,8 @@ test_expect_success 'status when splitting a commit' '
 	ONTO=$(git rev-parse --short HEAD~3) &&
 	git rebase -i HEAD~3 &&
 	git reset HEAD^ &&
-	TGT=$(git rev-parse --short HEAD) &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $TGT
+	# rebase in progress; onto $ONTO
 	# You are currently splitting a commit while rebasing branch '\''split_commit'\'' on '\''$ONTO'\''.
 	#   (Once your working directory is clean, run "git rebase --continue")
 	#
@@ -246,11 +244,10 @@ test_expect_success 'status after editing the last commit with --amend during a
 	export FAKE_LINES &&
 	test_when_finished "git rebase --abort" &&
 	ONTO=$(git rev-parse --short HEAD~3) &&
-	TGT=$(git rev-parse --short three_amend) &&
 	git rebase -i HEAD~3 &&
 	git commit --amend -m "foo" &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $TGT
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''amend_last'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -280,7 +277,7 @@ test_expect_success 'status: (continue first edit) second edit' '
 	git rebase -i HEAD~3 &&
 	git rebase --continue &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -302,7 +299,7 @@ test_expect_success 'status: (continue first edit) second edit and split' '
 	git rebase --continue &&
 	git reset HEAD^ &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently splitting a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (Once your working directory is clean, run "git rebase --continue")
 	#
@@ -329,7 +326,7 @@ test_expect_success 'status: (continue first edit) second edit and amend' '
 	git rebase --continue &&
 	git commit --amend -m "foo" &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -351,7 +348,7 @@ test_expect_success 'status: (amend first edit) second edit' '
 	git commit --amend -m "a" &&
 	git rebase --continue &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -374,7 +371,7 @@ test_expect_success 'status: (amend first edit) second edit and split' '
 	git rebase --continue &&
 	git reset HEAD^ &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently splitting a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (Once your working directory is clean, run "git rebase --continue")
 	#
@@ -402,7 +399,7 @@ test_expect_success 'status: (amend first edit) second edit and amend' '
 	git rebase --continue &&
 	git commit --amend -m "d" &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -426,7 +423,7 @@ test_expect_success 'status: (split first edit) second edit' '
 	git commit -m "e" &&
 	git rebase --continue &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -451,7 +448,7 @@ test_expect_success 'status: (split first edit) second edit and split' '
 	git rebase --continue &&
 	git reset HEAD^ &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently splitting a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (Once your working directory is clean, run "git rebase --continue")
 	#
@@ -481,7 +478,7 @@ test_expect_success 'status: (split first edit) second edit and amend' '
 	git rebase --continue &&
 	git commit --amend -m "h" &&
 	cat >expected <<-EOF &&
-	# HEAD detached from $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently editing a commit while rebasing branch '\''several_edits'\'' on '\''$ONTO'\''.
 	#   (use "git commit --amend" to amend the current commit)
 	#   (use "git rebase --continue" once you are satisfied with your changes)
@@ -601,7 +598,7 @@ test_expect_success 'status when rebase conflicts with statushints disabled' '
 	ONTO=$(git rev-parse --short HEAD^^) &&
 	test_must_fail git rebase HEAD^ --onto HEAD^^ &&
 	cat >expected <<-EOF &&
-	# HEAD detached at $ONTO
+	# rebase in progress; onto $ONTO
 	# You are currently rebasing branch '\''statushints_disabled'\'' on '\''$ONTO'\''.
 	#
 	# Unmerged paths:
diff --git a/wt-status.c b/wt-status.c
index 2511270..85a00f1 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1174,7 +1174,10 @@ void wt_status_print(struct wt_status *s)
 			branch_name += 11;
 		else if (!strcmp(branch_name, "HEAD")) {
 			branch_status_color = color(WT_STATUS_NOBRANCH, s);
-			if (state.detached_from) {
+			if (state.rebase_in_progress || state.rebase_interactive_in_progress) {
+				on_what = _("rebase in progress; onto ");
+				branch_name = state.onto;
+			} else if (state.detached_from) {
 				unsigned char sha1[20];
 				branch_name = state.detached_from;
 				if (!get_sha1("HEAD", sha1) &&
-- 
1.8.3.1.443.g4fd77b9

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