Fix thumbnail copying for incremental index, fix incremental index when there are no new updates, add option for JSON logs output

src/web/serve.c

@@ -20,6 +20,13 @@ static struct mg_http_serve_opts DefaultServeOpts = {
 };
 
 
+__always_inline
+static char *address_to_string(struct mg_addr *addr) {
+    static char address_to_string_buf[INET6_ADDRSTRLEN];
+
+    return mg_ntoa(addr, address_to_string_buf, sizeof(address_to_string_buf));
+}
+
 static void send_response_line(struct mg_connection *nc, int status_code, size_t length, char *extra_headers) {
     mg_printf(
             nc,
@@ -592,6 +599,11 @@ static void ev_router(struct mg_connection *nc, int ev, void *ev_data, UNUSED(vo
             }
         }
 
+        LOG_DEBUGF("serve.c", "<%s> GET %s",
+                   address_to_string(&(nc->rem)),
+                   hm->uri
+        )
+
         if (mg_http_match_uri(hm, "/")) {
             search_index(nc, hm);
         } else if (mg_http_match_uri(hm, "/favicon.ico")) {