Modules

Define properly modules.

Modules should only use the queue to communicate information to the lkt_state.

The lkt_state should use the reg to get function pointers and other properties from the modules. This reg will include macros to get function pointers and call the function with the given arguments. The reg will notify when a function is not available, and won't segfault. By doing so:

• Some modules (player, repo) won't be necessary to launch lektord. The server can be launched even if some functionalities are not here.
• Simplify the modules information in the lektor.ini file.
• It will be possible to unload and load modules on the fly.
• Events from the lkt_state queue can be differed to when the module is loaded.

inc/common/queue.h

@@ -3,15 +3,22 @@
 #include <pthread.h>
 #include <common/common.h>
 
-#define LKT_PLAY_STOP   ((void *) (size_t) 0)
-#define LKT_PLAY_PLAY   ((void *) (size_t) 1)
-#define LKT_PLAY_PAUSE  ((void *) (size_t) 2)
-#define LKT_PLAY_TOGGLE ((void *) (size_t) 3)
+enum {
+    _LKT_PLAY_STOP   = 0,
+    _LKT_PLAY_PLAY   = 1,
+    _LKT_PLAY_PAUSE  = 2,
+    _LKT_PLAY_TOGGLE = 3,
+};
+
+#define LKT_PLAY_STOP   ((void *) (size_t) _LKT_PLAY_STOP)
+#define LKT_PLAY_PLAY   ((void *) (size_t) _LKT_PLAY_PLAY)
+#define LKT_PLAY_PAUSE  ((void *) (size_t) _LKT_PLAY_PAUSE)
+#define LKT_PLAY_TOGGLE ((void *) (size_t) _LKT_PLAY_TOGGLE)
 
 enum lkt_event_type {
     lkt_event_null          = 0,        // NULL
     lkt_event_play_pos      = (1 << 1), // size_t
-    lkt_event_play_file     = (1 << 2), // const char*
+    lkt_event_play_file     = (1 << 2), // XXX: UNUSED //
     lkt_event_play_next     = (1 << 3), // NULL
     lkt_event_play_prev     = (1 << 4), // NULL
     lkt_event_play_toggle   = (1 << 5), // size_t, `LKT_PLAY_.*`