openbox/engine.c

   1 #include "engine.h"
   2 #include "parse.h"
   3
   4 #include <glib.h>
   5 #include <gmodule.h>
   6 #ifdef HAVE_STDLIB_H
   7 #  include <stdlib.h>
   8 #endif
   9
  10 char *engine_name;
  11 char *engine_theme;
  12 char *engine_layout;
  13 char *engine_font;
  14 gboolean engine_shadow;
  15 int engine_shadow_offset;
  16 int engine_shadow_tint;
  17
  18 EngineFrameNew *engine_frame_new;
  19 EngineFrameGrabClient *engine_frame_grab_client;
  20 EngineFrameReleaseClient *engine_frame_release_client;
  21 EngineFrameAdjustArea *engine_frame_adjust_area;
  22 EngineFrameAdjustShape *engine_frame_adjust_shape;
  23 EngineFrameAdjustState *engine_frame_adjust_state;
  24 EngineFrameAdjustFocus *engine_frame_adjust_focus;
  25 EngineFrameAdjustTitle *engine_frame_adjust_title;
  26 EngineFrameAdjustIcon *engine_frame_adjust_icon;
  27 EngineFrameShow *engine_frame_show;
  28 EngineFrameHide *engine_frame_hide;
  29 EngineGetContext *engine_get_context;
  30 EngineRenderLabel *engine_render_label;
  31 EngineSizeLabel *engine_size_label;
  32
  33 static GModule *module = NULL;
  34 static EngineStartup *estartup = NULL;
  35 static EngineShutdown *eshutdown = NULL;
  36
  37 #define LOADSYM(name, var) \
  38     if (!g_module_symbol(module, #name, (gpointer*)&var)) { \
  39         g_warning("Failed to load symbol %s from engine", #name); \
  40         return FALSE; \
  41     }
  42
  43 static gboolean load(char *name)
  44 {
  45     char *path;
  46
  47     g_assert(module == NULL);
  48
  49     path = g_build_filename(ENGINEDIR, name, NULL);
  50     module = g_module_open(path, 0);
  51     g_free(path);
  52
  53     if (module == NULL) {
  54         path = g_build_filename(g_get_home_dir(), ".openbox", "engines", name,
  55                                 NULL);
  56         module = g_module_open(path, 0);
  57         g_free(path);
  58     }
  59
  60     if (module == NULL)
  61         return FALSE;
  62
  63     /* load the engine's symbols */
  64     LOADSYM(startup, estartup);
  65     LOADSYM(shutdown, eshutdown);
  66     LOADSYM(frame_new, engine_frame_new);
  67     LOADSYM(frame_grab_client, engine_frame_grab_client);
  68     LOADSYM(frame_release_client, engine_frame_release_client);
  69     LOADSYM(frame_adjust_area, engine_frame_adjust_area);
  70     LOADSYM(frame_adjust_shape, engine_frame_adjust_shape);
  71     LOADSYM(frame_adjust_state, engine_frame_adjust_state);
  72     LOADSYM(frame_adjust_focus, engine_frame_adjust_focus);
  73     LOADSYM(frame_adjust_title, engine_frame_adjust_title);
  74     LOADSYM(frame_adjust_icon, engine_frame_adjust_icon);
  75     LOADSYM(frame_show, engine_frame_show);
  76     LOADSYM(frame_hide, engine_frame_hide);
  77     LOADSYM(get_context, engine_get_context);
  78     LOADSYM(render_label, engine_render_label);
  79     LOADSYM(size_label, engine_size_label);
  80
  81     if (!estartup())
  82         return FALSE;
  83
  84     return TRUE;
  85 }
  86
  87 static void parse_assign(char *name, ParseToken *value)
  88 {
  89     if (!g_ascii_strcasecmp(name, "engine")) {
  90         if (value->type != TOKEN_STRING)
  91             yyerror("invalid value");
  92         else {
  93             g_free(engine_name);
  94             engine_name = g_strdup(value->data.string);
  95         }
  96     } else if (!g_ascii_strcasecmp(name, "theme")) {
  97         if (value->type != TOKEN_STRING)
  98             yyerror("invalid value");
  99         else {
 100             g_free(engine_theme);
 101             engine_theme = g_strdup(value->data.string);
 102         }
 103     } else if (!g_ascii_strcasecmp(name, "titlebarlayout")) {
 104         if (value->type != TOKEN_STRING)
 105             yyerror("invalid value");
 106         else {
 107             g_free(engine_layout);
 108             engine_layout = g_strdup(value->data.string);
 109         }
 110     } else if (!g_ascii_strcasecmp(name, "font.title")) {
 111         if (value->type != TOKEN_STRING)
 112             yyerror("invalid value");
 113         else {
 114             g_free(engine_font);
 115             engine_font = g_strdup(value->data.string);
 116         }
 117     } else if (!g_ascii_strcasecmp(name, "font.title.shadow")) {
 118         if (value->type != TOKEN_BOOL)
 119             yyerror("invalid value");
 120         else {
 121             engine_shadow = value->data.bool;
 122         }
 123     } else if (!g_ascii_strcasecmp(name, "font.title.shadow.offset")) {
 124         if (value->type != TOKEN_INTEGER)
 125             yyerror("invalid value");
 126         else {
 127             engine_shadow_offset = value->data.integer;
 128         }
 129     } else if (!g_ascii_strcasecmp(name, "font.title.shadow.tint")) {
 130         if (value->type != TOKEN_INTEGER)
 131             yyerror("invalid value");
 132         else {
 133             engine_shadow_tint = value->data.integer;
 134             if (engine_shadow_tint < -100) engine_shadow_tint = -100;
 135             else if (engine_shadow_tint > 100) engine_shadow_tint = 100;
 136         }
 137     } else
 138         yyerror("invalid option");
 139     parse_free_token(value);
 140 }
 141
 142 void engine_startup()
 143 {
 144     module = NULL;
 145     engine_name = g_strdup(DEFAULT_ENGINE);
 146     engine_theme = NULL;
 147     engine_layout = g_strdup("NLIMC");
 148     engine_font = g_strdup("Sans-7");
 149     engine_shadow = FALSE;
 150     engine_shadow_offset = 1;
 151     engine_shadow_tint = 25;
 152
 153     parse_reg_section("engine", NULL, parse_assign);
 154 }
 155
 156 void engine_load()
 157 {
 158     if (load(engine_name))
 159         return;
 160     g_warning("Failed to load the engine '%s'", engine_name);
 161     g_message("Falling back to the default: '%s'", DEFAULT_ENGINE);
 162     if (!load(DEFAULT_ENGINE)) {
 163         g_critical("Failed to load the engine '%s'. Aborting", DEFAULT_ENGINE);
 164         exit(1);
 165     }
 166 }
 167
 168 void engine_shutdown()
 169 {
 170     g_free(engine_name);
 171     if (module != NULL) {
 172         eshutdown();
 173         g_module_close(module);
 174     }
 175 }