Report dmon modify events

src/api/system.c

@@ -240,7 +240,19 @@ top:
     case SDL_USEREVENT:
       lua_pushstring(L, "dirchange");
       lua_pushnumber(L, e.user.code >> 16);
-      lua_pushstring(L, (e.user.code & 0xffff) == DMON_ACTION_DELETE ? "delete" : "create");
+      switch (e.user.code & 0xffff) {
+        case DMON_ACTION_DELETE:
+          lua_pushstring(L, "delete");
+          break;
+        case DMON_ACTION_CREATE:
+          lua_pushstring(L, "create");
+          break;
+        case DMON_ACTION_MODIFY:
+          lua_pushstring(L, "modify");
+          break;
+        default:
+          return luaL_error(L, "unknown dmon event action: %d", e.user.code & 0xffff);
+      }
       lua_pushstring(L, e.user.data1);
       free(e.user.data1);
       return 4;

src/dirmonitor.c

@@ -52,8 +52,6 @@ void dirmonitor_watch_callback(dmon_watch_id watch_id, dmon_action action, const
     send_sdl_event(watch_id, DMON_ACTION_DELETE, oldfilepath);
     send_sdl_event(watch_id, DMON_ACTION_CREATE, filepath);
     break;
-  case DMON_ACTION_MODIFY:
-    break;
   default:
     send_sdl_event(watch_id, action, filepath);
   }