openbox/engine.c

   1 #include "engine.h"
   2
   3 #include <glib.h>
   4 #include <gmodule.h>
   5 #ifdef HAVE_STDLIB_H
   6 #  include <stdlib.h>
   7 #endif
   8
   9 char *engine_name = NULL;
  10 char *engine_theme = NULL;
  11 char *engine_layout = "NDSLIMC";
  12 char *engine_font = "Sans-7";
  13 gboolean engine_shadow = FALSE;
  14 int engine_shadow_offset = 1;
  15 int engine_shadow_tint = 25;
  16
  17 static GModule *module = NULL;
  18 static EngineStartup *estartup = NULL;
  19 static EngineShutdown *eshutdown = NULL;
  20
  21 #define LOADSYM(name, var) \
  22     if (!g_module_symbol(module, #name, (gpointer*)&var)) { \
  23         g_warning("Failed to load symbol %s from engine", #name); \
  24         return FALSE; \
  25     }
  26
  27 static gboolean load(char *name)
  28 {
  29     char *path;
  30
  31     g_assert(module == NULL);
  32
  33     path = g_build_filename(ENGINEDIR, name, NULL);
  34     module = g_module_open(path, 0);
  35     g_free(path);
  36
  37     if (module == NULL) {
  38         path = g_build_filename(g_get_home_dir(), ".openbox", "engines", name,
  39                                 NULL);
  40         module = g_module_open(path, 0);
  41         g_free(path);
  42     }
  43
  44     if (module == NULL)
  45         return FALSE;
  46
  47     /* load the engine's symbols */
  48     LOADSYM(startup, estartup);
  49     LOADSYM(shutdown, eshutdown);
  50     LOADSYM(frame_new, engine_frame_new);
  51     LOADSYM(frame_grab_client, engine_frame_grab_client);
  52     LOADSYM(frame_release_client, engine_frame_release_client);
  53     LOADSYM(frame_adjust_area, engine_frame_adjust_area);
  54     LOADSYM(frame_adjust_shape, engine_frame_adjust_shape);
  55     LOADSYM(frame_adjust_state, engine_frame_adjust_state);
  56     LOADSYM(frame_adjust_focus, engine_frame_adjust_focus);
  57     LOADSYM(frame_adjust_title, engine_frame_adjust_title);
  58     LOADSYM(frame_adjust_icon, engine_frame_adjust_icon);
  59     LOADSYM(frame_show, engine_frame_show);
  60     LOADSYM(frame_hide, engine_frame_hide);
  61     LOADSYM(get_context, engine_get_context);
  62
  63     if (!estartup())
  64         return FALSE;
  65
  66     return TRUE;
  67 }
  68
  69 void engine_startup()
  70 {
  71     module = NULL;
  72 }
  73
  74 void engine_load()
  75 {
  76     if (load(engine_name))
  77         return;
  78     g_warning("Failed to load the engine '%s'", engine_name);
  79     g_message("Falling back to the default: '%s'", DEFAULT_ENGINE);
  80     if (!load(DEFAULT_ENGINE)) {
  81         g_critical("Failed to load the engine '%s'. Aborting", DEFAULT_ENGINE);
  82         exit(1);
  83     }
  84 }
  85
  86 void engine_shutdown()
  87 {
  88     g_free(engine_name);
  89     if (module != NULL) {
  90         eshutdown();
  91         g_module_close(module);
  92     }
  93 }