1 files changed, 30 insertions, 33 deletions

diff --git a/diff.c b/diff.c
index 35e46dd968..4dfe824c85 100644
--- a/diff.c
+++ b/diff.c
@@ -4301,35 +4301,34 @@ static void run_external_diff(const char *pgm,
 			      const char *xfrm_msg,
 			      struct diff_options *o)
 {
-	struct strvec argv = STRVEC_INIT;
-	struct strvec env = STRVEC_INIT;
+	struct child_process cmd = CHILD_PROCESS_INIT;
 	struct diff_queue_struct *q = &diff_queued_diff;
 
-	strvec_push(&argv, pgm);
-	strvec_push(&argv, name);
+	strvec_push(&cmd.args, pgm);
+	strvec_push(&cmd.args, name);
 
 	if (one && two) {
-		add_external_diff_name(o->repo, &argv, name, one);
+		add_external_diff_name(o->repo, &cmd.args, name, one);
 		if (!other)
-			add_external_diff_name(o->repo, &argv, name, two);
+			add_external_diff_name(o->repo, &cmd.args, name, two);
 		else {
-			add_external_diff_name(o->repo, &argv, other, two);
-			strvec_push(&argv, other);
-			strvec_push(&argv, xfrm_msg);
+			add_external_diff_name(o->repo, &cmd.args, other, two);
+			strvec_push(&cmd.args, other);
+			strvec_push(&cmd.args, xfrm_msg);
 		}
 	}
 
-	strvec_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
-	strvec_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
+	strvec_pushf(&cmd.env, "GIT_DIFF_PATH_COUNTER=%d",
+		     ++o->diff_path_counter);
+	strvec_pushf(&cmd.env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
 
 	diff_free_filespec_data(one);
 	diff_free_filespec_data(two);
-	if (run_command_v_opt_cd_env(argv.v, RUN_USING_SHELL, NULL, env.v))
+	cmd.use_shell = 1;
+	if (run_command(&cmd))
 		die(_("external diff died, stopping at %s"), name);
 
 	remove_tempfile();
-	strvec_clear(&argv);
-	strvec_clear(&env);
 }
 
 static int similarity_index(struct diff_filepair *p)
@@ -4616,8 +4615,6 @@ static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
 	builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
 }
 
-static void prep_parse_options(struct diff_options *options);
-
 void repo_diff_setup(struct repository *r, struct diff_options *options)
 {
 	memcpy(options, &default_diff_options, sizeof(*options));
@@ -4663,8 +4660,6 @@ void repo_diff_setup(struct repository *r, struct diff_options *options)
 
 	options->color_moved = diff_color_moved_default;
 	options->color_moved_ws_handling = diff_color_moved_ws_default;
-
-	prep_parse_options(options);
 }
 
 static const char diff_status_letters[] = {
@@ -4822,8 +4817,6 @@ void diff_setup_done(struct diff_options *options)
 			options->filter = ~filter_bit[DIFF_STATUS_FILTER_AON];
 		options->filter &= ~options->filter_not;
 	}
-
-	FREE_AND_NULL(options->parseopts);
 }
 
 int parse_long_opt(const char *opt, const char **argv,
@@ -5420,7 +5413,8 @@ static int diff_opt_rotate_to(const struct option *opt, const char *arg, int uns
 	return 0;
 }
 
-static void prep_parse_options(struct diff_options *options)
+struct option *add_diff_options(const struct option *opts,
+				struct diff_options *options)
 {
 	struct option parseopts[] = {
 		OPT_GROUP(N_("Diff output format options")),
@@ -5690,22 +5684,25 @@ static void prep_parse_options(struct diff_options *options)
 		OPT_END()
 	};
 
-	ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
-	memcpy(options->parseopts, parseopts, sizeof(parseopts));
+	return parse_options_concat(opts, parseopts);
 }
 
 int diff_opt_parse(struct diff_options *options,
 		   const char **av, int ac, const char *prefix)
 {
+	struct option no_options[] = { OPT_END() };
+	struct option *parseopts = add_diff_options(no_options, options);
+
 	if (!prefix)
 		prefix = "";
 
-	ac = parse_options(ac, av, prefix, options->parseopts, NULL,
+	ac = parse_options(ac, av, prefix, parseopts, NULL,
 			   PARSE_OPT_KEEP_DASHDASH |
 			   PARSE_OPT_KEEP_UNKNOWN_OPT |
 			   PARSE_OPT_NO_INTERNAL_HELP |
 			   PARSE_OPT_ONE_SHOT |
 			   PARSE_OPT_STOP_AT_NON_OPTION);
+	free(parseopts);
 
 	return ac;
 }
@@ -5773,6 +5770,13 @@ void diff_free_filepair(struct diff_filepair *p)
 	free(p);
 }
 
+void diff_free_queue(struct diff_queue_struct *q)
+{
+	for (int i = 0; i < q->nr; i++)
+		diff_free_filepair(q->queue[i]);
+	free(q->queue);
+}
+
 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
 {
 	int abblen;
@@ -6330,13 +6334,9 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	int i;
 	int result = diff_get_patch_id(options, oid, diff_header_only);
 
-	for (i = 0; i < q->nr; i++)
-		diff_free_filepair(q->queue[i]);
-
-	free(q->queue);
+	diff_free_queue(q);
 	DIFF_QUEUE_CLEAR(q);
 
 	return result;
@@ -6511,7 +6511,6 @@ void diff_free(struct diff_options *options)
 	diff_free_file(options);
 	diff_free_ignore_regex(options);
 	clear_pathspec(&options->pathspec);
-	FREE_AND_NULL(options->parseopts);
 }
 
 void diff_flush(struct diff_options *options)
@@ -6605,10 +6604,8 @@ void diff_flush(struct diff_options *options)
 	if (output_format & DIFF_FORMAT_CALLBACK)
 		options->format_callback(q, options, options->format_callback_data);
 
-	for (i = 0; i < q->nr; i++)
-		diff_free_filepair(q->queue[i]);
 free_queue:
-	free(q->queue);
+	diff_free_queue(q);
 	DIFF_QUEUE_CLEAR(q);
 	diff_free(options);