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/lektor/reg.h

@@ -14,7 +14,7 @@ struct module_reg {
     const char *name;
     union {
         reg_func func;
-        struct module_reg *obj;
+        struct module_reg **obj; /* First item of the array */
     };
 };
 
@@ -29,7 +29,7 @@ struct lkt_module {
 #define REG_BEGIN(reg)      struct module_reg reg[] = {
 #define REG_ADD(f)          { .name = #f,   .func = f    },
 #define REG_ADD_NAMED(n, f) { .name = n,    .func = f    },
-#define REG_REGISTER(n, s)  { .name = n,    .obj  = s    },
+#define REG_REGISTER(n, s)  { .name = n,    .obj  = &s   },
 #define REG_END()           { .name = NULL, .func = NULL } };
 #define REG_DEFINE(reg)     struct module_reg reg* = NULL;