Merge branch 'pb/status-rebase-fixes' into jch

A few fixes around "git status" while "git rebase" is running,
plus a corner case bug fix for "git rebase -r".

* pb/status-rebase-fixes:
  wt-status: suggest 'git rebase --continue' to conclude 'merge' instruction
  wt-status: also abbreviate 'merge' and 'fixup -C' lines during rebase
  SQUASH??? - <CAPig+cS92W_gYuNsaTvQxiP3xBK7Wpg0__uVkgAU1x0OFJUZgQ@mail.gmail.com>
  rebase -r: do create merge commit after empty resolution

Author: gitster

sequencer.c

@@ -4333,6 +4333,7 @@ static int do_merge(struct repository *r,
 		error(_("could not even attempt to merge '%.*s'"),
 		      merge_arg_len, arg);
 		unlink(git_path_merge_msg(r));
+		unlink(git_path_merge_head(r));
 		goto leave_merge;
 	}
 	/*
@@ -5348,7 +5349,7 @@ static int commit_staged_changes(struct repository *r,
 		flags |= AMEND_MSG;
 	}
 
-	if (is_clean) {
+	if (is_clean && !file_exists(git_path_merge_head(r))) {
 		if (refs_ref_exists(get_main_ref_store(r),
 				    "CHERRY_PICK_HEAD") &&
 		    refs_delete_ref(get_main_ref_store(r), "",

t/t3418-rebase-continue.sh

@@ -111,6 +111,30 @@ test_expect_success 'rebase -r passes merge strategy options correctly' '
 	git rebase --continue
 '
 
+test_expect_success '--continue creates merge commit after empty resolution' '
+	git reset --hard main &&
+	git checkout -b rebase_i_merge &&
+	test_commit unrelated &&
+	git checkout -b rebase_i_merge_side &&
+	test_commit side2 main.txt &&
+	git checkout rebase_i_merge &&
+	test_commit side1 main.txt &&
+	PICK=$(git rev-parse --short rebase_i_merge) &&
+	test_must_fail git merge rebase_i_merge_side &&
+	echo side1 >main.txt &&
+	git add main.txt &&
+	test_tick &&
+	git commit --no-edit &&
+
+	test_must_fail env FAKE_LINES="1 2 3 5 6 7 8 9 10 11" \
+		git rebase -ir main &&
+	echo side1 >main.txt &&
+	git add main.txt &&
+	git rebase --continue &&
+	git log --merges >out &&
+	test_grep "Merge branch .rebase_i_merge_side." out
+'
+
 test_expect_success '--skip after failed fixup cleans commit message' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b with-conflicting-fixup &&

t/t7512-status-help.sh

@@ -183,6 +183,81 @@ EOF
 	test_cmp expected actual
 '
 
+test_expect_success 'status during rebase -ir after conflicted merge (exec git merge)' '
+	git reset --hard main &&
+	git checkout -b rebase_i_merge &&
+	test_commit unrelated &&
+	git checkout -b rebase_i_merge_side &&
+	test_commit side2 main.txt &&
+	git checkout rebase_i_merge &&
+	test_commit side1 main.txt &&
+	PICK=$(git rev-parse --short rebase_i_merge) &&
+	test_must_fail git merge rebase_i_merge_side &&
+	echo side1 >main.txt &&
+	git add main.txt &&
+	test_tick &&
+	git commit --no-edit &&
+	MERGE=$(git rev-parse --short rebase_i_merge) &&
+	ONTO=$(git rev-parse --short main) &&
+	test_when_finished "git rebase --abort" &&
+	FAKE_LINES="1 2 3 5 6 7 8 9 10 exec_git_merge_refs/rewritten/rebase-i-merge-side" &&
+	export FAKE_LINES &&
+	test_must_fail git rebase -ir main &&
+	cat >expect <<EOF &&
+interactive rebase in progress; onto $ONTO
+Last commands done (8 commands done):
+   pick $PICK side1
+   exec git merge refs/rewritten/rebase-i-merge-side
+  (see more in file .git/rebase-merge/done)
+No commands remaining.
+
+You have unmerged paths.
+  (fix conflicts and run "git commit")
+  (use "git merge --abort" to abort the merge)
+
+Unmerged paths:
+  (use "git add <file>..." to mark resolution)
+	both modified:   main.txt
+
+no changes added to commit (use "git add" and/or "git commit -a")
+EOF
+	git status --untracked-files=no >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'status during rebase -ir after replaying conflicted merge (merge)' '
+	PICK=$(git rev-parse --short :/side1) &&
+	UNRELATED=$(git rev-parse --short :/unrelated) &&
+	MERGE=$(git rev-parse --short rebase_i_merge) &&
+	ONTO=$(git rev-parse --short main) &&
+	test_when_finished "git rebase --abort" &&
+	FAKE_LINES="1 2 3 5 6 7 8 9 10 11 4" &&
+	export FAKE_LINES &&
+	test_must_fail git rebase -ir main &&
+	cat >expect <<EOF &&
+interactive rebase in progress; onto $ONTO
+Last commands done (8 commands done):
+   pick $PICK side1
+   merge -C $MERGE rebase-i-merge-side # Merge branch '\''rebase_i_merge_side'\'' into rebase_i_merge
+  (see more in file .git/rebase-merge/done)
+Next command to do (1 remaining command):
+   pick $UNRELATED unrelated
+  (use "git rebase --edit-todo" to view and edit)
+You are currently rebasing branch '\''rebase_i_merge'\'' on '\''$ONTO'\''.
+  (fix conflicts and then run "git rebase --continue")
+  (use "git rebase --skip" to skip this patch)
+  (use "git rebase --abort" to check out the original branch)
+
+Unmerged paths:
+  (use "git add <file>..." to mark resolution)
+	both modified:   main.txt
+
+no changes added to commit (use "git add" and/or "git commit -a")
+EOF
+	git status --untracked-files=no >actual &&
+	test_cmp expect actual
+'
+
 
 test_expect_success 'status when rebasing -i in edit mode' '
 	git reset --hard main &&

wt-status.c

@@ -1342,9 +1342,11 @@ static int split_commit_in_progress(struct wt_status *s)
 
 /*
  * Turn
- * "pick d6a2f0303e897ec257dd0e0a39a5ccb709bc2047 some message"
+ * "pick d6a2f0303e897ec257dd0e0a39a5ccb709bc2047 some message" and
+ * "merge -C d6a2f0303e897ec257dd0e0a39a5ccb709bc2047 some-branch"
  * into
- * "pick d6a2f03 some message"
+ * "pick d6a2f03 some message" and
+ * "merge -C d6a2f03 some-branch"
  *
  * The function assumes that the line does not contain useless spaces
  * before or after the command.
@@ -1360,20 +1362,31 @@ static void abbrev_oid_in_line(struct strbuf *line)
 	    starts_with(line->buf, "l "))
 		return;
 
-	split = strbuf_split_max(line, ' ', 3);
+	split = strbuf_split_max(line, ' ', 4);
 	if (split[0] && split[1]) {
 		struct object_id oid;
-
+		struct strbuf *hash;
+
+		if ((!strcmp(split[0]->buf, "merge ") ||
+		     !strcmp(split[0]->buf, "m "    ) ||
+		     !strcmp(split[0]->buf, "fixup ") ||
+		     !strcmp(split[0]->buf, "f "    )) &&
+		    (!strcmp(split[1]->buf, "-C ") ||
+		     !strcmp(split[1]->buf, "-c "))) {
+			hash = split[2];
+		} else {
+			hash = split[1];
+		}
 		/*
 		 * strbuf_split_max left a space. Trim it and re-add
 		 * it after abbreviation.
 		 */
-		strbuf_trim(split[1]);
-		if (!repo_get_oid(the_repository, split[1]->buf, &oid)) {
-			strbuf_reset(split[1]);
-			strbuf_add_unique_abbrev(split[1], &oid,
+		strbuf_trim(hash);
+		if (!repo_get_oid(the_repository, hash->buf, &oid)) {
+			strbuf_reset(hash);
+			strbuf_add_unique_abbrev(hash, &oid,
 						 DEFAULT_ABBREV);
-			strbuf_addch(split[1], ' ');
+			strbuf_addch(hash, ' ');
 			strbuf_reset(line);
 			for (i = 0; split[i]; i++)
 				strbuf_addbuf(line, split[i]);
@@ -1731,6 +1744,7 @@ int wt_status_check_rebase(const struct worktree *wt,
 			   struct wt_status_state *state)
 {
 	struct stat st;
+	struct string_list have_done = STRING_LIST_INIT_DUP;
 
 	if (!stat(worktree_git_path(the_repository, wt, "rebase-apply"), &st)) {
 		if (!stat(worktree_git_path(the_repository, wt, "rebase-apply/applying"), &st)) {
@@ -1747,8 +1761,12 @@ int wt_status_check_rebase(const struct worktree *wt,
 			state->rebase_interactive_in_progress = 1;
 		else
 			state->rebase_in_progress = 1;
+		read_rebase_todolist("rebase-merge/done", &have_done);
+		if (have_done.nr > 0 && starts_with(have_done.items[have_done.nr - 1].string, "merge"))
+				state->merge_during_rebase_in_progress = 1;
 		state->branch = get_branch(wt, "rebase-merge/head-name");
 		state->onto = get_branch(wt, "rebase-merge/onto");
+		string_list_clear(&have_done, 0);
 	} else
 		return 0;
 	return 1;
@@ -1842,10 +1860,15 @@ static void wt_longstatus_print_state(struct wt_status *s)
 
 	if (state->merge_in_progress) {
 		if (state->rebase_interactive_in_progress) {
-			show_rebase_information(s, state_color);
-			fputs("\n", s->fp);
-		}
-		show_merge_in_progress(s, state_color);
+			if (state->merge_during_rebase_in_progress)
+				show_rebase_in_progress(s, state_color);
+			else {
+				show_rebase_information(s, state_color);
+				fputs("\n", s->fp);
+				show_merge_in_progress(s, state_color);
+			}
+		} else
+			show_merge_in_progress(s, state_color);
 	} else if (state->am_in_progress)
 		show_am_in_progress(s, state_color);
 	else if (state->rebase_in_progress || state->rebase_interactive_in_progress)

wt-status.h

@@ -87,6 +87,7 @@ struct wt_status_state {
 	int am_empty_patch;
 	int rebase_in_progress;
 	int rebase_interactive_in_progress;
+	int merge_during_rebase_in_progress;
 	int cherry_pick_in_progress;
 	int bisect_in_progress;
 	int revert_in_progress;