1 files changed, 27 insertions, 3 deletions
diff --git a/pkgrel.c b/pkgrel.c
index ecbfcea..961ecbd 100644
--- a/pkgrel.c
+++ b/pkgrel.c
@@ -112,11 +112,35 @@ match_line(const git_diff_delta* delta, const git_diff_hunk* hunk, const git_dif
 }
 
 
+/// Parses an optional output prefix from *args* and returns it.
+const char*
+parse_args(const int argc, char* argv[])
+{
+	int opt;
+	const char* prefix = NULL;
+	while (-1 != (opt = getopt(argc, argv, ":d"))) {
+		switch (opt) {
+		case 'd':
+			prefix = "pkgrel=";
+			break;
+		default:
+			break;  // Accept anything but -d without prior --
+		}
+	}
+	if (NULL == prefix) {
+		if (argc > optind)
+			prefix = argv[optind];
+		else
+			prefix = "";
+	}
+	return prefix;
+}
+
+
 int
 main(int argc, char* argv[])
 {
-	(void) argc;
-	(void) argv;
+	const char* prefix = parse_args(argc, argv);
 	FILE* file = fopen("PKGBUILD", "r");
 	if (NULL == file) {
 		dprintf(2, "PKGBUILD not found or cannot be opened\n");
@@ -176,5 +200,5 @@ main(int argc, char* argv[])
 		exit(1);
 	}
 	else
-		printf("%d\n", relpkg);
+		printf("%s%d\n", prefix, relpkg);
 }