1 files changed, 59 insertions, 0 deletions
diff --git a/cgit-about-filter.c b/cgit-about-filter.c
new file mode 100644
index 0000000..68dfd9b
--- /dev/null
+++ b/cgit-about-filter.c
@@ -0,0 +1,59 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+
+#define EXEC(args) execvp(args[0], args)
+
+static const char *extension(const char *filename);
+
+char *mandoc[] = { "mandoc", "-Thtml", "-Ofragment", NULL };
+char *lowdown[] = { "lowdown", "-Thtml", NULL };
+
+int
+main(int argc, char *argv[])
+{
+	int opt;
+	while ((opt = getopt(argc, argv, "")) != -1)
+		return 1;
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 1)
+		return 1;
+
+	const char *ext = extension(argv[0]);
+	if (ext == NULL)
+		return 1;
+
+	if (strlen(ext) == 1 && isdigit(*ext)) {
+		EXEC(mandoc);
+	} else if (strcmp(ext, "md") == 0) {
+		EXEC(lowdown);
+	}
+
+	return 1;
+}
+
+static const char *
+extension(const char *filename)
+{
+	const char *end = strrchr(filename, '.');
+
+	// no dot
+	if (end == NULL)
+		return NULL;
+
+	// no extension
+	if (end == filename)
+		return NULL;
+
+	const char *ext = end + 1;
+
+	// extension is empty/name ends with dot
+	if (*ext == '\0')
+		return NULL;
+
+	return ext;
+}