src/script.c

   1 /* Copyright (c) 2008 Sadrul Habib Chowdhury (sadrul@users.sf.net)
   2  * 2009 Rui Guo (firemeteor.guo@gmail.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 3, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program (see the file COPYING); if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  18  *
  19  ****************************************************************
  20  */
  21
  22 #include "config.h"
  23 #include "screen.h"
  24 #include "extern.h"
  25 #include <stddef.h>
  26
  27 /*Binding structure & functions*/
  28
  29 struct binding *bindings = NULL;
  30
  31 static void
  32 register_binding (struct binding *new_binding)
  33 {
  34   if (!new_binding->registered)
  35     {
  36       new_binding->b_next = bindings;
  37       bindings = new_binding;
  38       new_binding->registered = 1;
  39     }
  40 }
  41
  42 #ifdef LUA_BINDING
  43 extern struct binding lua_binding;
  44 #endif
  45
  46 void LoadBindings(void)
  47 {
  48 #ifdef LUA_BINDING
  49   register_binding(&lua_binding);
  50 #endif
  51 }
  52
  53 void
  54 FinalizeBindings (void)
  55 {
  56   struct binding *binding=bindings;
  57   while(binding)
  58     {
  59       if (binding->inited)
  60         binding->bd_Finit();
  61       binding = binding->b_next;
  62     }
  63 }
  64
  65 void
  66 ScriptSource(int argc, const char **argv)
  67 {
  68   int ret = 0;
  69   int async = 0;
  70   const char *bd_select = 0, *script;
  71   struct binding *binding = bindings;
  72
  73   /* Parse the commandline options
  74    * script source [-async|-a] [-binding|-b <binding>] script
  75    */
  76   while (*argv && **argv == '-')
  77     {
  78       /* check for (-a | -async) */
  79       const char *arg = *argv;
  80       if ((arg[1] == 'a' && !arg[2])
  81           || strcmp(arg, "-async") == 0)
  82         async = 1;
  83       /* check for (-b | -binding) */
  84       else if ((arg[1] == 'b' && !arg[2])
  85                || strcmp(arg, "-binding") == 0)
  86         {
  87           argv++;
  88           bd_select = *argv;
  89         }
  90       argv++;
  91     }
  92   script = *argv;
  93
  94   while (binding)
  95     {
  96       if (!bd_select || strcmp(bd_select, binding->name) == 0)
  97         {
  98           /*dynamically initialize the binding*/
  99           if (!binding->inited)
 100             {
 101               binding->bd_Init();
 102               binding->inited = 1;
 103             }
 104
 105           /*and source the script*/
 106           ret = binding->bd_Source(script, async);
 107           if (ret)
 108             break;
 109         }
 110       binding = binding->b_next;
 111     }
 112   if (!ret)
 113     LMsg(0, "Could not source specified script %s", script);
 114 }
 115
 116 int
 117 ScriptCall(int argc, const char **argv)
 118 {
 119   int ret = 0;
 120   struct binding *binding = bindings;
 121   const char *bd_select = 0, *func;
 122   /* Parse the commandline options
 123    * script call [-binding|-b <binding>] function
 124    */
 125   while (*argv && **argv == '-')
 126     {
 127       const char *arg = *argv;
 128       /* check for (-b | -binding) */
 129       if ((arg[1] == 'b' && !arg[2])
 130           || strcmp(arg, "-binding") == 0)
 131         {
 132           argv++;
 133           bd_select = *argv;
 134         }
 135       argv++;
 136     }
 137   func = *argv;
 138   argv++;
 139
 140   while (binding)
 141     {
 142       if (!bd_select || strcmp(bd_select, binding->name) == 0)
 143         {
 144           ret = binding->bd_call(func, argv);
 145           if (ret)
 146             break;
 147         }
 148       binding = binding->b_next;
 149     }
 150
 151   if (!ret)
 152     LMsg(0, "Failed to run specified script coummand '%s'", func);
 153   return ret;
 154 }
 155
 156 void
 157 ScriptCmd(int argc, const char **argv)
 158 {
 159   const char * sub = *argv;
 160   argv++;argc--;
 161   if (!strcmp(sub, "call"))
 162     ScriptCall(argc, argv);
 163   else if (!strcmp(sub, "source"))
 164     ScriptSource(argc, argv);
 165 }
 166
 167 /* Event notification handling */
 168
 169 struct gevents globalevents;
 170
 171 /* To add a new event, introduce a field for that event to the object in
 172  * question, and don't forget to put an descriptor here.  NOTE: keep the
 173  * name field sorted in alphabet order, the searching relies on it.
 174  *
 175  * the params string specifies the expected parameters. The length of the
 176  * string equals to the number of parameters. Each char specifies the type of
 177  * the parameter, with its meaning similar to those in printf().
 178  *
 179  * s: string (char *)
 180  * S: string array (char **)
 181  * i: signed int
 182  * d: display
 183  * c: canvas
 184  */
 185
 186 struct sev_description {
 187     char *name;
 188     char *params;
 189     int offset;
 190 } event_table[] = {
 191       /* NOTE: Manually sorted in Alphabet order! */
 192
 193       /* Display events*/
 194       {"display_onidle", "d", offsetof(struct display, d_sev.onidle)},
 195       /* Global events */
 196       {"global_cmdexecuted", "sS", offsetof(struct gevents, cmdexecuted)},
 197       {"global_detached", "di", offsetof(struct gevents, detached)},
 198           /* The command "detach" triggers both 'cmdexecuted' and 'detached' events.
 199              However, we need the 'detached' event to trigger callbacks from remote detaches.
 200            */
 201       /* fore window changed to window w on display d. */
 202       {"global_forechanged", "dw", offsetof(struct gevents, forechanged)},
 203       {"global_onattach", "d", offsetof(struct gevents, onattach)},
 204       {"global_processcaption", "c", offsetof(struct gevents, processcaption)},
 205
 206       /* Window events */
 207       {"window_can_resize", "", offsetof(struct win, w_sev.canresize)},
 208       {"window_onclose", "w", offsetof(struct win, w_sev.onclose)},
 209       {"window_onfocus", "dw", offsetof(struct win, w_sev.onfocus)},
 210       /* last view of window w disappeared on display d. */
 211       {"window_onhide", "dw", offsetof(struct win, w_sev.onhide)},
 212       /* window w lost its focus on display d. */
 213       {"window_onleave", "dw", offsetof(struct win, w_sev.onleave)},
 214       {"window_onresize", "w", offsetof(struct win, w_sev.onresize)},
 215       /* window w first showed up on display d. When there are regions, it can
 216        * still be shown while losing focus. */
 217       {"window_onshow", "dw", offsetof(struct win, w_sev.onshow)},
 218 };
 219
 220 /* Get the event queue with the given name in the obj.  If the obj is NULL,
 221  * global events are searched.  If no event is found, a NULL is returned.
 222  */
 223 struct script_event *
 224 object_get_event(char *obj, const char *name)
 225 {
 226   int lo, hi, n, cmp;
 227   if (!obj)
 228     obj = (char *)&globalevents;
 229
 230   lo = 0;
 231   n = hi = sizeof(event_table) / sizeof(struct sev_description);
 232   while (lo < hi)
 233     {
 234       int half;
 235       half = (lo + hi) >> 1;
 236       cmp = strcmp(name, event_table[half].name);
 237       if (cmp > 0)
 238         lo = half + 1;
 239       else
 240         hi = half;
 241     }
 242
 243   if (lo >= n || strcmp(name, event_table[lo].name))
 244     return 0;
 245   else
 246     {
 247       /*found an entry.*/
 248       struct script_event *res;
 249       res = (struct script_event *) (obj + event_table[lo].offset);
 250       /*Setup the parameter record.*/
 251       res->params = event_table[lo].params;
 252       return res;
 253     }
 254 }
 255
 256 /* Put a listener in a proper position in the chain
 257  * according to the privlege.
 258  * Not insert duplicate entry. return zero if successful.*/
 259 int
 260 register_listener(struct script_event *ev, struct listener *l)
 261 {
 262   unsigned int priv = l->priv;
 263   struct listener *p, *iter = &ev->listeners;
 264
 265   while(iter->chain && priv >= iter->chain->priv)
 266     {
 267       iter = iter->chain;
 268     }
 269   p = iter;
 270
 271   l->chain = p->chain;
 272   l->prev = p;
 273   if (p->chain)
 274     p->chain->prev = l;
 275   p->chain = l;
 276   return 0;
 277 }
 278
 279 void
 280 unregister_listener(struct listener *l)
 281 {
 282   struct listener *p = l->prev;
 283   p->chain = l->chain;
 284   if (l->chain)
 285     l->chain->prev = p;
 286   l->chain = l->prev = 0;
 287   l->handler = 0;
 288   free(l);
 289 }
 290
 291 /* Trigger event with given parameters.*/
 292 int
 293 trigger_sevent(struct script_event *ev, VA_DOTS)
 294 {
 295   int res = 0;
 296   struct listener *chain;
 297   char *params;
 298   VA_LIST(va);
 299   /*invalid or un-registered event structure*/
 300   if (!ev || !ev->params)
 301     return 0;
 302
 303   /*process the chain in order, stop if any of the handler returns true.*/
 304   chain = ev->listeners.chain;
 305   params = ev->params;
 306   while (chain)
 307     {
 308       VA_START(va, ev);
 309       res = chain->bd->bd_dispatch(chain->handler, params, va);
 310       VA_END(va);
 311       if (res)
 312         break;
 313       chain = chain->chain;
 314     }
 315
 316   return res;
 317 }
 318
 319 #define ALL_SCRIPTS(fn, params, stop) do { \
 320   struct binding *iter; \
 321   for (iter = bindings; iter; iter = iter->b_next) \
 322     { \
 323       if (iter->fns && iter->fns->fn && (ret = (iter->fns->fn params)) && stop) \
 324         break; \
 325     } \
 326 } while (0)
 327
 328 /* Broker functions */
 329
 330 /* Broker hash */
 331 struct broker *b_hash[255];
 332
 333 #define DELETED ((struct broker*)1)
 334 #define BHASH(o) (((int)(o) >> sizeof(struct broker *)) & 255)
 335 struct broker **broker_from_obj(void *obj)
 336 {
 337   struct broker **bucket = b_hash + BHASH(obj);
 338   while (*bucket && (*bucket)->obj != obj)
 339     {
 340       bucket = &(*bucket)->b_next;
 341     }
 342   return bucket;
 343 }
 344
 345 struct broker *
 346 get_obj_broker(void *obj)
 347 {
 348   struct broker **bucket = broker_from_obj(obj);
 349   if (!obj)
 350     return NULL;
 351
 352   /* Not found, allocate a new one */
 353   if (!*bucket)
 354     {
 355       struct broker *tmp = (struct broker *)malloc(sizeof(struct broker));
 356       if (!tmp)
 357         return NULL;
 358
 359       *bucket = tmp;
 360       tmp->obj = obj;
 361       tmp->ref = 0;
 362       tmp->valid = 1;
 363       tmp->b_next = NULL;
 364     }
 365   else
 366     {
 367       /* Assertion */
 368       if (!(*bucket)->valid)
 369         exit(1);
 370     }
 371   (*bucket)->ref++;
 372
 373   return *bucket;
 374 }
 375
 376 void * get_broker_obj(struct broker **pbroker)
 377 {
 378   struct broker *broker = *pbroker;
 379   if (!broker)
 380     return NULL;
 381
 382   if (broker->valid)
 383     return broker->obj;
 384
 385   /* Clear the invalid reference, and decrease the ref-count. */
 386   broker_unref(pbroker);
 387   return NULL;
 388 }
 389
 390 void broker_inv_obj(void *obj)
 391 {
 392   struct broker *n, **b = broker_from_obj(obj);
 393   if (*b) {
 394     (*b)->valid = 0;
 395     /* Unplug the broker from the hash. */
 396     n = *b;
 397     *b = (*b)->b_next;
 398     n->b_next = 0;
 399   }
 400 }
 401
 402 void broker_unref(struct broker **pbroker)
 403 {
 404   struct broker *broker = *pbroker;
 405   *pbroker = NULL;
 406   if (--broker->ref == 0)
 407     {
 408       if (broker->valid) {
 409           struct broker *n, **b = broker_from_obj(broker->obj);
 410           if (*b) {
 411               n = (*b)->b_next;
 412               free(*b);
 413               *b = n;
 414           } else {
 415               /* FIXME:Should not happen! But act better.*/
 416               exit(1);
 417           }
 418       } else {
 419           /* It had been unplugged before. */
 420           free(broker);
 421       }
 422     }
 423 }