line-log: extract pathspec parsing from line ranges into a helper function

A helper function to parse the paths involved in the line ranges and
to turn them into a pathspec will be useful in the next patch.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

line-log.c

@@ -736,16 +736,9 @@ static struct line_log_data *lookup_line_range(struct rev_info *revs,
 	return ret;
 }
 
-void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
+static void parse_pathspec_from_ranges(struct pathspec *pathspec,
+				       struct line_log_data *range)
 {
-	struct commit *commit = NULL;
-	struct line_log_data *range;
-
-	commit = check_single_commit(rev);
-	range = parse_lines(rev->diffopt.repo, commit, prefix, args);
-	add_line_range(rev, commit, range);
-
-	if (!rev->diffopt.detect_rename) {
 	struct line_log_data *r;
 	struct argv_array array = ARGV_ARRAY_INIT;
 	const char **paths;
@@ -754,11 +747,22 @@ void line_log_init(struct rev_info *rev, const char *prefix, struct string_list
 		argv_array_push(&array, r->path);
 	paths = argv_array_detach(&array);
 
-		parse_pathspec(&rev->diffopt.pathspec, 0,
-			       PATHSPEC_PREFER_FULL, "", paths);
+	parse_pathspec(pathspec, 0, PATHSPEC_PREFER_FULL, "", paths);
 	/* strings are now owned by pathspec */
 	free(paths);
-	}
+}
+
+void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
+{
+	struct commit *commit = NULL;
+	struct line_log_data *range;
+
+	commit = check_single_commit(rev);
+	range = parse_lines(rev->diffopt.repo, commit, prefix, args);
+	add_line_range(rev, commit, range);
+
+	if (!rev->diffopt.detect_rename)
+		parse_pathspec_from_ranges(&rev->diffopt.pathspec, range);
 }
 
 static void move_diff_queue(struct diff_queue_struct *dst,