Pass opts structure to mg_http_serve_dir()

src/http.h

@@ -19,6 +19,12 @@ struct mg_http_message {
   struct mg_str message;  // Request line + headers + body
 };
 
+// Parameter for mg_http_serve_dir()
+struct mg_http_serve_opts {
+  const char *root_dir;
+  const char *ssi_pattern;
+};
+
 int mg_http_parse(const char *s, size_t len, struct mg_http_message *);
 int mg_http_get_request_len(const unsigned char *buf, size_t buf_len);
 void mg_http_printf_chunk(struct mg_connection *cnn, const char *fmt, ...);
@@ -28,7 +34,7 @@ struct mg_connection *mg_http_listen(struct mg_mgr *, const char *url,
 struct mg_connection *mg_http_connect(struct mg_mgr *, const char *url,
                                       mg_event_handler_t fn, void *fn_data);
 void mg_http_serve_dir(struct mg_connection *, struct mg_http_message *hm,
-                       const char *path);
+                       const struct mg_http_serve_opts *);
 void mg_http_serve_file(struct mg_connection *, struct mg_http_message *,
                         const char *, const char *mime);
 void mg_http_reply(struct mg_connection *, int status_code, const char *headers,