trailer: put process_trailers() options into a struct

We already have two options and are about to add a few more.
To avoid having a huge number of boolean arguments, let's
convert to an options struct which can be passed in.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/interpret-trailers.c

@@ -18,13 +18,12 @@ static const char * const git_interpret_trailers_usage[] = {
 
 int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
 {
-	int in_place = 0;
-	int trim_empty = 0;
+	struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
 	struct string_list trailers = STRING_LIST_INIT_NODUP;
 
 	struct option options[] = {
-		OPT_BOOL(0, "in-place", &in_place, N_("edit files in place")),
-		OPT_BOOL(0, "trim-empty", &trim_empty, N_("trim empty trailers")),
+		OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
+		OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
 		OPT_STRING_LIST(0, "trailer", &trailers, N_("trailer"),
 				N_("trailer(s) to add")),
 		OPT_END()
@@ -36,11 +35,11 @@ int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
 	if (argc) {
 		int i;
 		for (i = 0; i < argc; i++)
-			process_trailers(argv[i], in_place, trim_empty, &trailers);
+			process_trailers(argv[i], &opts, &trailers);
 	} else {
-		if (in_place)
+		if (opts.in_place)
 			die(_("no input file given for in-place editing"));
-		process_trailers(NULL, in_place, trim_empty, &trailers);
+		process_trailers(NULL, &opts, &trailers);
 	}
 
 	string_list_clear(&trailers, 0);

trailer.c

@@ -967,7 +967,9 @@ static FILE *create_in_place_tempfile(const char *file)
 	return outfile;
 }
 
-void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
+void process_trailers(const char *file,
+		      const struct process_trailer_options *opts,
+		      struct string_list *trailers)
 {
 	LIST_HEAD(head);
 	LIST_HEAD(arg_head);
@@ -979,7 +981,7 @@ void process_trailers(const char *file, int in_place, int trim_empty, struct str
 
 	read_input_file(&sb, file);
 
-	if (in_place)
+	if (opts->in_place)
 		outfile = create_in_place_tempfile(file);
 
 	/* Print the lines before the trailers */
@@ -989,14 +991,14 @@ void process_trailers(const char *file, int in_place, int trim_empty, struct str
 
 	process_trailers_lists(&head, &arg_head);
 
-	print_all(outfile, &head, trim_empty);
+	print_all(outfile, &head, opts->trim_empty);
 
 	free_all(&head);
 
 	/* Print the lines after the trailers as is */
 	fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
 
-	if (in_place)
+	if (opts->in_place)
 		if (rename_tempfile(&trailers_tempfile, file))
 			die_errno(_("could not rename temporary file to %s"), file);
 

trailer.h

@@ -22,7 +22,15 @@ struct trailer_info {
 	size_t trailer_nr;
 };
 
-void process_trailers(const char *file, int in_place, int trim_empty,
+struct process_trailer_options {
+	int in_place;
+	int trim_empty;
+};
+
+#define PROCESS_TRAILER_OPTIONS_INIT {0}
+
+void process_trailers(const char *file,
+		      const struct process_trailer_options *opts,
 		      struct string_list *trailers);
 
 void trailer_info_get(struct trailer_info *info, const char *str);