[PATCH v3 4/4] sequencer.c: don't die on invalid cleanup_arg

[Denton Liu <liu.denton@gmail.com>]

When get_cleanup_mode was provided with an invalid cleanup_arg, it used
to die. Warn user and fallback to default behaviour if an invalid
cleanup_arg is given.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---
 builtin/commit.c |  2 +-
 builtin/merge.c  |  4 ++--
 builtin/revert.c |  2 +-
 sequencer.c      | 10 +++++++---
 sequencer.h      |  2 +-
 5 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 43291d79bd..0072a5817a 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1167,7 +1167,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
 		die(_("Only one of --include/--only/--all/--interactive/--patch can be used."));
 	if (argc == 0 && (also || (only && !amend && !allow_empty)))
 		die(_("No paths with --include/--only does not make sense."));
-	cleanup_mode = get_cleanup_mode(cleanup_arg, use_editor);
+	cleanup_mode = get_cleanup_mode(cleanup_arg, use_editor, 1);
 
 	handle_untracked_files_arg(s);
 
diff --git a/builtin/merge.c b/builtin/merge.c
index d4217ebcf5..3b597ec540 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -916,7 +916,7 @@ static int suggest_conflicts(void)
 	 * Thus, we will get the cleanup mode which is returned when we _are_ using
 	 * an editor.
 	 */
-	append_conflicts_hint(&msgbuf, get_cleanup_mode(cleanup_arg, 1));
+	append_conflicts_hint(&msgbuf, get_cleanup_mode(cleanup_arg, 1, 1));
 	fputs(msgbuf.buf, fp);
 	strbuf_release(&msgbuf);
 	fclose(fp);
@@ -1424,7 +1424,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	if (option_edit < 0)
 		option_edit = default_edit_option();
 
-	cleanup_mode = get_cleanup_mode(cleanup_arg, 0 < option_edit);
+	cleanup_mode = get_cleanup_mode(cleanup_arg, 0 < option_edit, 1);
 
 	if (!use_strategies) {
 		if (!remoteheads)
diff --git a/builtin/revert.c b/builtin/revert.c
index fe18036be7..a96f2ecd8a 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -139,7 +139,7 @@ static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
 		opts->allow_empty = 1;
 
 	if (cleanup_arg)
-		opts->default_msg_cleanup = get_cleanup_mode(cleanup_arg, 1);
+		opts->default_msg_cleanup = get_cleanup_mode(cleanup_arg, 1, 1);
 
 	/* Check for incompatible command line arguments */
 	if (cmd) {
diff --git a/sequencer.c b/sequencer.c
index 5c04bae7ac..7d18c55223 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -170,7 +170,7 @@ static int git_sequencer_config(const char *k, const char *v, void *cb)
 		if (status)
 			return status;
 
-		opts->default_msg_cleanup = get_cleanup_mode(s, !is_rebase_i(opts));
+		opts->default_msg_cleanup = get_cleanup_mode(s, !is_rebase_i(opts), 0);
 
 		free((char *)s);
 		return status;
@@ -488,7 +488,7 @@ static int fast_forward_to(const struct object_id *to, const struct object_id *f
 }
 
 enum commit_msg_cleanup_mode get_cleanup_mode(const char *cleanup_arg,
-	int use_editor)
+	int use_editor, int die_on_error)
 {
 	if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
 		return use_editor ? COMMIT_MSG_CLEANUP_ALL :
@@ -502,7 +502,11 @@ enum commit_msg_cleanup_mode get_cleanup_mode(const char *cleanup_arg,
 	else if (!strcmp(cleanup_arg, "scissors"))
 		return use_editor ? COMMIT_MSG_CLEANUP_SCISSORS :
 				    COMMIT_MSG_CLEANUP_SPACE;
-	else
+	else if (!die_on_error) {
+		warning(_("Invalid cleanup mode %s, falling back to default"), cleanup_arg);
+		return use_editor ? COMMIT_MSG_CLEANUP_ALL :
+				    COMMIT_MSG_CLEANUP_SPACE;
+	} else
 		die(_("Invalid cleanup mode %s"), cleanup_arg);
 }
 
diff --git a/sequencer.h b/sequencer.h
index aa99503dd7..c4c80051ea 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -94,7 +94,7 @@ void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag);
 void append_conflicts_hint(struct strbuf *msgbuf,
 		enum commit_msg_cleanup_mode cleanup_mode);
 enum commit_msg_cleanup_mode get_cleanup_mode(const char *cleanup_arg,
-	int use_editor);
+	int use_editor, int die_on_error);
 
 void cleanup_message(struct strbuf *msgbuf,
 	enum commit_msg_cleanup_mode cleanup_mode, int verbose);
-- 
2.21.0.370.g4fdb13b891