Dogcows Code - chaz/openbox/blob - openbox/plugin.c

   1 #include "plugins/interface.h"
   2
   3 #include <glib.h>
   4 #include <gmodule.h>
   5
   6 typedef struct {
   7     GModule *module;
   8     char *name;
   9
  10     PluginSetupConfig config;
  11     PluginStartup startup;
  12     PluginShutdown shutdown;
  13     PluginCreate create;
  14     PluginDestroy destroy;
  15 } Plugin;
  16
  17 static gpointer load_sym(GModule *module, char *name, char *symbol,
  18                          gboolean allow_fail)
  19 {
  20     gpointer var;
  21     if (!g_module_symbol(module, symbol, &var)) {
  22         if (!allow_fail)
  23             g_warning("Failed to load symbol '%s' from plugin '%s'",
  24                       symbol, name);
  25         var = NULL;
  26     }
  27     return var;
  28 }
  29
  30 static Plugin *plugin_new(char *name)
  31 {
  32     Plugin *p;
  33     char *path;
  34
  35     p = g_new(Plugin, 1);
  36
  37     path = g_build_filename(g_get_home_dir(), ".openbox", "plugins", name,
  38                             NULL);
  39     p->module = g_module_open(path, 0);
  40     g_free(path);
  41
  42     if (p->module == NULL) {
  43         path = g_build_filename(PLUGINDIR, name, NULL);
  44         p->module = g_module_open(path, 0);
  45         g_free(path);
  46     }
  47
  48     if (p->module == NULL) {
  49         g_warning(g_module_error());
  50         g_free(p);
  51         return NULL;
  52     }
  53
  54     p->config = (PluginSetupConfig)load_sym(p->module, name,
  55                                             "plugin_setup_config", FALSE);
  56     p->startup = (PluginStartup)load_sym(p->module, name, "plugin_startup",
  57                                          FALSE);
  58     p->shutdown = (PluginShutdown)load_sym(p->module, name, "plugin_shutdown",
  59                                            FALSE);
  60     p->create = (PluginCreate)load_sym(p->module, name, "plugin_create", TRUE);
  61     p->destroy = (PluginDestroy)load_sym(p->module, name, "plugin_destroy",
  62                                          TRUE);
  63
  64     if (p->config == NULL || p->startup == NULL || p->shutdown == NULL) {
  65         g_module_close(p->module);
  66         g_free(p);
  67         return NULL;
  68     }
  69
  70     p->name = g_strdup(name);
  71     return p;
  72 }
  73
  74 static void plugin_free(Plugin *p)
  75 {
  76     p->shutdown();
  77
  78     g_free(p->name);
  79     g_module_close(p->module);
  80 }
  81
  82
  83 static GData *plugins = NULL;
  84
  85 void plugin_startup()
  86 {
  87     g_datalist_init(&plugins);
  88 }
  89
  90 void plugin_shutdown()
  91 {
  92     g_datalist_clear(&plugins);
  93 }
  94
  95 gboolean plugin_open_full(char *name, gboolean reopen)
  96 {
  97     Plugin *p;
  98
  99     if (g_datalist_get_data(&plugins, name) != NULL) {
 100         if (!reopen)
 101             g_warning("plugin '%s' already loaded, can't load again", name);
 102         return TRUE;
 103     }
 104
 105     p = plugin_new(name);
 106     if (p == NULL) {
 107         g_warning("failed to load plugin '%s'", name);
 108         return FALSE;
 109     }
 110     p->config();
 111
 112     g_datalist_set_data_full(&plugins, name, p, (GDestroyNotify) plugin_free);
 113     return TRUE;
 114 }
 115
 116 gboolean plugin_open(char *name) {
 117     return plugin_open_full(name, FALSE);
 118 }
 119
 120 gboolean plugin_open_reopen(char *name) {
 121     return plugin_open_full(name, TRUE);
 122 }
 123
 124 void plugin_close(char *name)
 125 {
 126     g_datalist_remove_data(&plugins, name);
 127 }
 128
 129 static void foreach_start(GQuark key, Plugin *p, gpointer *foo)
 130 {
 131     p->startup();
 132 }
 133
 134 void plugin_startall()
 135 {
 136     g_datalist_foreach(&plugins, (GDataForeachFunc)foreach_start, NULL);
 137 }
 138
 139 void plugin_loadall()
 140 {
 141     GIOChannel *io;
 142     GError *err;
 143     char *path, *name;
 144
 145     path = g_build_filename(g_get_home_dir(), ".openbox", "pluginrc", NULL);
 146     err = NULL;
 147     io = g_io_channel_new_file(path, "r", &err);
 148     g_free(path);
 149
 150     if (io == NULL) {
 151         path = g_build_filename(RCDIR, "pluginrc", NULL);
 152         err = NULL;
 153         io = g_io_channel_new_file(path, "r", &err);
 154         g_free(path);
 155     }
 156
 157     if (io == NULL) {
 158         /* load the default plugins */
 159         plugin_open("keyboard");
 160         plugin_open("mouse");
 161         plugin_open("placement");
 162         plugin_open("resistance");
 163
 164         /* XXX rm me when the parser loads me magically */
 165         plugin_open("client_menu");
 166     } else {
 167         /* load the plugins in the rc file */
 168         while (g_io_channel_read_line(io, &name, NULL, NULL, &err) ==
 169                G_IO_STATUS_NORMAL) {
 170             g_strstrip(name);
 171             if (name[0] != '\0' && name[0] != '#')
 172                 plugin_open(name);
 173             g_free(name);
 174         }
 175         g_io_channel_unref(io);
 176     }
 177 }
 178
 179 void *plugin_create(char *name /* TODO */)
 180 {
 181     Plugin *p = (Plugin *)g_datalist_get_data(&plugins, name);
 182
 183     if (p == NULL) {
 184         g_warning("Unable to find plugin for create: %s", name);
 185         return NULL;
 186     }
 187
 188     if (p->create == NULL || p->destroy == NULL) {
 189         g_critical("Unsupported create/destroy: %s", name);
 190         return NULL;
 191     }
 192
 193     return p->create();
 194 }
 195
 196 void plugin_destroy(char *name, void *data)
 197 {
 198     Plugin *p = (Plugin *)g_datalist_get_data(&plugins, name);
 199
 200     if (p == NULL) {
 201         g_critical("Unable to find plugin for destroy: %s", name);
 202         /* really shouldn't happen, but attempt to free something anyway? */
 203         g_free(data);
 204         return;
 205     }
 206
 207     if (p->destroy == NULL || p->create == NULL) {
 208         g_critical("Unsupported create/destroy: %s", name);
 209         /* really, really shouldn't happen, but attempt to free anyway? */
 210         g_free(data);
 211         return;
 212     }
 213
 214     p->destroy(data);
 215 }