src/lua.c

   1 /* Lua scripting support
   2  *
   3  * Copyright (c) 2008 Sadrul Habib Chowdhury (sadrul@users.sf.net)
   4  * Copyright (c) 2009
   5  *      Sadrul Habib Chowdhury (sadrul@users.sf.net)
   6  *      Rui Guo (firemeteor.guo@gmail.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program (see the file COPYING); if not, write to the
  20  * Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  22  *
  23  ****************************************************************
  24  */
  25 #include <sys/types.h>
  26 #include "config.h"
  27 #include "screen.h"
  28 #include <sys/stat.h>
  29 #include <unistd.h>
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34
  35 #include "extern.h"
  36 #include "logfile.h"
  37
  38 #include <lua.h>
  39 #include <lauxlib.h>
  40 #include <lualib.h>
  41
  42 static int StackDump(lua_State *L, const char *message)
  43 {
  44   FILE *f = fopen("/tmp/debug/stack", "ab");
  45   int i = lua_gettop(L);
  46   if (message)
  47     fprintf(f, "%s", message);
  48   while (i)
  49     {
  50       int t = lua_type(L, i);
  51       switch (t)
  52         {
  53           case LUA_TSTRING:
  54             fprintf(f, "String: %s\n", lua_tostring(L, i));
  55             break;
  56
  57           case LUA_TBOOLEAN:
  58             fprintf(f, "Boolean: %s\n", lua_toboolean(L, i) ? "true" : "false");
  59             break;
  60
  61           case LUA_TNUMBER:
  62             fprintf(f, "Number: %g\n", lua_tonumber(L, i));
  63             break;
  64
  65           default:
  66             fprintf(f, "Type: %s\n", lua_typename(L, t));
  67         }
  68       i--;
  69     }
  70   if (message)
  71     fprintf(f, "----\n");
  72   fclose(f);
  73   return 0;
  74 }
  75
  76 extern struct win *windows, *fore;
  77 extern struct display *displays, *display;
  78 extern struct LayFuncs WinLf;
  79 extern struct layer *flayer;
  80 extern void AppendWinMsgRend(const char *str, const char *color);
  81 extern void FocusCanvas(struct canvas *cv);
  82
  83 static int LuaDispatch(void *handler, const char *params, va_list va);
  84 static int LuaRegEvent(lua_State *L);
  85 static void LuaShowErr(lua_State *L);
  86 struct binding lua_binding;
  87
  88 enum
  89 {
  90   LUA_HANDLER_TYPE_N = 1,
  91   LUA_HANDLER_TYPE_F
  92 };
  93
  94 struct lua_handler
  95 {
  96   int type;
  97   union
  98   {
  99     const char *name;
 100     int reference;
 101   } u;
 102 };
 103
 104 typedef struct lua_handler *lua_handler;
 105 void LuaPushHandler(lua_State *L, lua_handler lh);
 106 void LuaHUnRef(lua_State *L, int key);
 107 lua_handler LuaCheckHandler(lua_State *L, int idx, int ref);
 108
 109 lua_handler
 110 LuaAllocHandler(const char *name, int ref)
 111 {
 112   struct lua_handler *lh;
 113   lh = (struct lua_handler*) malloc(sizeof(struct lua_handler));
 114   if (!lh)
 115     return NULL;
 116
 117   if (name)
 118     {
 119       lh->type = LUA_HANDLER_TYPE_N;
 120       lh->u.name = SaveStr(name);
 121     }
 122   else
 123     {
 124       lh->type = LUA_HANDLER_TYPE_F;
 125       lh->u.reference = ref;
 126     }
 127
 128   return lh;
 129 }
 130
 131 void
 132 LuaFreeHandler(lua_State *L, struct lua_handler **lh)
 133 {
 134   if ((*lh)->type == LUA_HANDLER_TYPE_N)
 135     Free((*lh)->u.name)
 136   else
 137     {
 138       LuaHUnRef(L, (*lh)->u.reference);
 139       (*lh)->u.reference = 0;
 140     }
 141   Free(*lh);
 142 }
 143 /** Template {{{ */
 144
 145 #define CHECK_TYPE(name, type) \
 146 static type * \
 147 check_##name(lua_State *L, int index) \
 148 { \
 149   struct broker **broker; \
 150   type *var; \
 151   luaL_checktype(L, index, LUA_TUSERDATA); \
 152   broker = (struct broker **) luaL_checkudata(L, index, #name); \
 153   if (broker) { \
 154       var = (type *)get_broker_obj(broker); \
 155   } \
 156   if (!broker || !*broker) \
 157     luaL_typerror(L, index, #name); \
 158   return var; \
 159 }
 160
 161 #define PUSH_TYPE(name, type) \
 162 static void \
 163 push_##name(lua_State *L, type **t) \
 164 { \
 165   if (!t || !*t) \
 166     lua_pushnil(L); \
 167   else \
 168     { \
 169       struct broker **r; \
 170       r = (struct broker **)lua_newuserdata(L, sizeof(struct broker *)); \
 171       *r = get_obj_broker(*t); \
 172       luaL_getmetatable(L, #name); \
 173       lua_setmetatable(L,-2); \
 174     } \
 175 }
 176
 177 /* Much of the following template comes from:
 178  *      http://lua-users.org/wiki/BindingWithMembersAndMethods
 179  */
 180
 181 static int get_int (lua_State *L, void *v)
 182 {
 183   lua_pushinteger (L, *(int*)v);
 184   return 1;
 185 }
 186
 187 static int set_int (lua_State *L, void *v)
 188 {
 189   *(int*)v = luaL_checkint(L, 3);
 190   return 0;
 191 }
 192
 193 static int get_number (lua_State *L, void *v)
 194 {
 195   lua_pushnumber(L, *(lua_Number*)v);
 196   return 1;
 197 }
 198
 199 static int set_number (lua_State *L, void *v)
 200 {
 201   *(lua_Number*)v = luaL_checknumber(L, 3);
 202   return 0;
 203 }
 204
 205 static int get_string (lua_State *L, void *v)
 206 {
 207   lua_pushstring(L, (char*)v );
 208   return 1;
 209 }
 210
 211 static int set_string (lua_State *L, void *v)
 212 {
 213   *(const char**)v = luaL_checkstring(L, 3);
 214   return 0;
 215 }
 216
 217 typedef int (*Xet_func) (lua_State *L, void *v);
 218
 219 /* member info for get and set handlers */
 220 struct Xet_reg
 221 {
 222   const char *name;  /* member name */
 223   Xet_func func;     /* get or set function for type of member */
 224   size_t offset;     /* offset of member within the struct */
 225   int (*absolute)(lua_State *);
 226 };
 227
 228 static void Xet_add (lua_State *L, const struct Xet_reg *l)
 229 {
 230   if (!l)
 231     return;
 232   for (; l->name; l++)
 233     {
 234       lua_pushstring(L, l->name);
 235       lua_pushlightuserdata(L, (void*)l);
 236       lua_settable(L, -3);
 237     }
 238 }
 239
 240 static int Xet_call (lua_State *L)
 241 {
 242   /* for get: stack has userdata, index, lightuserdata */
 243   /* for set: stack has userdata, index, value, lightuserdata */
 244   const struct Xet_reg *m = (const struct Xet_reg *)lua_touserdata(L, -1);  /* member info */
 245   void *obj;
 246   lua_pop(L, 1);                               /* drop lightuserdata */
 247   luaL_checktype(L, 1, LUA_TUSERDATA);
 248   if (m->absolute)
 249     return m->absolute(L);
 250   obj = get_broker_obj((struct broker **)lua_touserdata(L, 1));
 251   return m->func(L, (char *)obj + m->offset);
 252 }
 253
 254 static int index_handler (lua_State *L)
 255 {
 256   /* stack has userdata, index */
 257   lua_pushvalue(L, 2);                     /* dup index */
 258   lua_rawget(L, lua_upvalueindex(1));      /* lookup member by name */
 259   if (!lua_islightuserdata(L, -1))
 260     {
 261       lua_pop(L, 1);                         /* drop value */
 262       lua_pushvalue(L, 2);                   /* dup index */
 263       lua_gettable(L, lua_upvalueindex(2));  /* else try methods */
 264       if (lua_isnil(L, -1))                  /* invalid member */
 265         luaL_error(L, "cannot get member '%s'", lua_tostring(L, 2));
 266       return 1;
 267     }
 268   return Xet_call(L);                      /* call get function */
 269 }
 270
 271 static int newindex_handler (lua_State *L)
 272 {
 273   /* stack has userdata, index, value */
 274   lua_pushvalue(L, 2);                     /* dup index */
 275   lua_rawget(L, lua_upvalueindex(1));      /* lookup member by name */
 276   if (!lua_islightuserdata(L, -1))         /* invalid member */
 277     luaL_error(L, "cannot set member '%s'", lua_tostring(L, 2));
 278   return Xet_call(L);                      /* call set function */
 279 }
 280
 281 static int
 282 struct_register(lua_State *L, const char *name, const luaL_reg fn_methods[], const luaL_reg meta_methods[],
 283     const struct Xet_reg setters[], const struct Xet_reg getters[])
 284 {
 285   int metatable, methods;
 286
 287   /* create methods table & add it to the table of globals */
 288   luaL_register(L, name, fn_methods);
 289   methods = lua_gettop(L);
 290
 291   /* create metatable & add it to the registry */
 292   luaL_newmetatable(L, name);
 293   luaL_register(L, 0, meta_methods);  /* fill metatable */
 294
 295   /* To identify the type of object */
 296   lua_pushstring(L, "_objname");
 297   lua_pushstring(L, name);
 298   lua_rawset(L, -3);
 299
 300   metatable = lua_gettop(L);
 301
 302   lua_pushliteral(L, "__metatable");
 303   lua_pushvalue(L, methods);    /* dup methods table*/
 304   lua_rawset(L, metatable);     /* hide metatable:
 305                                    metatable.__metatable = methods */
 306
 307   lua_pushliteral(L, "__index");
 308   lua_pushvalue(L, metatable);  /* upvalue index 1 */
 309   Xet_add(L, getters);     /* fill metatable with getters */
 310   lua_pushvalue(L, methods);    /* upvalue index 2 */
 311   lua_pushcclosure(L, index_handler, 2);
 312   lua_rawset(L, metatable);     /* metatable.__index = index_handler */
 313
 314   lua_pushliteral(L, "__newindex");
 315   lua_newtable(L);              /* table for members you can set */
 316   Xet_add(L, setters);     /* fill with setters */
 317   lua_pushcclosure(L, newindex_handler, 1);
 318   lua_rawset(L, metatable);     /* metatable.__newindex = newindex_handler */
 319
 320   /* FIXME: Why do we leave an element on the stack? */
 321   lua_pop(L, 1);                /* drop metatable */
 322   return 1;                     /* return methods on the stack */
 323 }
 324
 325 /** }}} */
 326
 327 /** Callback {{{ */
 328 static void
 329 push_callback(lua_State *L, struct listener **t)
 330 {
 331   if (!t || !*t)
 332     lua_pushnil(L);
 333   else
 334     {
 335       struct listener **r;
 336       r = (struct listener **)lua_newuserdata(L, sizeof(struct listener *));
 337       *r = *t;
 338       luaL_getmetatable(L, "callback");
 339       lua_setmetatable(L,-2);
 340     }
 341 }
 342
 343
 344 static int
 345 internal_unhook(lua_State *L, int warn)
 346 {
 347   /*Emulate check_callback() */
 348   struct listener **ppl;
 349   luaL_checktype(L, 1, LUA_TUSERDATA);
 350   ppl = (struct listener **) luaL_checkudata(L, 1, "callback");
 351
 352   if (!ppl)
 353     luaL_typerror(L, 1, "callback");
 354
 355   if (!*ppl)
 356     {
 357       if (warn)
 358         {
 359           lua_pushboolean(L, 0);
 360           lua_pushstring(L, "Callback already unhooked.");
 361           LuaShowErr(L);
 362         }
 363     }
 364   else
 365     {
 366       LuaFreeHandler(L, (lua_handler *)&(*ppl)->handler);
 367       unregister_listener(*ppl);
 368       *ppl = 0;
 369       if (warn)
 370         lua_pushboolean(L, 1);
 371     }
 372   return warn != 0;
 373 }
 374 static int
 375 callback_unhook(lua_State *L)
 376 {
 377   return internal_unhook(L, 1);
 378 }
 379
 380 static const luaL_reg callback_methods[] = {
 381   {"unhook", callback_unhook},
 382   {0, 0}
 383 };
 384
 385 int
 386 callback_collect(lua_State *L)
 387 {
 388   return internal_unhook(L, 0);
 389 }
 390
 391 static const luaL_reg callback_metamethods[] = {
 392   {"__gc", callback_collect},
 393   {0, 0}
 394 };
 395
 396 static const struct Xet_reg callback_setters[] = {
 397   {0, 0}
 398 };
 399
 400 static const struct Xet_reg callback_getters[] = {
 401   {0, 0}
 402 };
 403
 404
 405 /** }}} */
 406
 407 static int
 408 screen_object_collect(lua_State *L)
 409 {
 410   struct broker **pbroker;
 411   luaL_checktype(L, 1, LUA_TUSERDATA);
 412   pbroker = (struct broker **)lua_touserdata(L, 1);
 413   broker_unref(pbroker);
 414   return 0;
 415 }
 416
 417 /** Window {{{ */
 418
 419 PUSH_TYPE(window, struct win)
 420
 421 CHECK_TYPE(window, struct win)
 422
 423 static int get_window(lua_State *L, void *v)
 424 {
 425   push_window(L, (struct win **)v);
 426   return 1;
 427 }
 428
 429 static int
 430 window_change_title(lua_State *L)
 431 {
 432   struct win *w = check_window(L, 1);
 433   unsigned int len;
 434   const char *title = luaL_checklstring(L, 3, &len);
 435   ChangeAKA(w, (char *)title, len);
 436   return 0;
 437 }
 438
 439 static int
 440 window_change_number(lua_State *L)
 441 {
 442   struct win *w = check_window(L, 1);
 443   int newnum = luaL_checkint(L, 3);
 444   ChangeWinNum(w->w_number, newnum);
 445   return 0;
 446 }
 447
 448 static int
 449 window_get_monitor_status(lua_State *L)
 450 {
 451   struct win *w = check_window(L, 1);
 452   int activity = luaL_checkint(L, 2);
 453   if (activity)
 454     /*monitor*/
 455     lua_pushinteger(L, w->w_monitor != MON_OFF);
 456   else
 457     /*silence*/
 458     lua_pushinteger(L, w->w_silence == SILENCE_ON ? w->w_silencewait: 0);
 459
 460   return 1;
 461 }
 462
 463 static int
 464 window_stuff(lua_State *L)
 465 {
 466   unsigned int len;
 467   struct layer *oldflayer = flayer;
 468   struct win *w = check_window(L, 1);
 469   const char *str = luaL_checklstring(L, 2, &len);
 470
 471   flayer = &w->w_layer;
 472   while(len)
 473     LayProcess((char **)&str, (int *) &len);
 474   flayer = oldflayer;
 475   return 0;
 476 }
 477
 478 static int
 479 window_activate(lua_State *L)
 480 {
 481   struct win *w = check_window(L, 1);
 482   SetForeWindow(w);
 483   return 0;
 484 }
 485
 486 static const luaL_reg window_methods[] = {
 487   {"get_monitor_status", window_get_monitor_status},
 488   {"stuff", window_stuff},
 489   {"activate", window_activate},
 490   {"hook", LuaRegEvent},
 491   {0, 0}
 492 };
 493
 494 static int
 495 window_tostring(lua_State *L)
 496 {
 497   char str[128];
 498   struct win *w = check_window(L, 1);
 499   snprintf(str, sizeof(str), "{window #%d: '%s'}", w->w_number, w->w_title);
 500   lua_pushstring(L, str);
 501   return 1;
 502 }
 503
 504 static int
 505 window_equality(lua_State *L)
 506 {
 507   struct win *w1 = check_window(L, 1), *w2 = check_window(L, 2);
 508   lua_pushboolean(L, (w1 == w2 || (w1 && w2 && w1->w_number == w2->w_number)));
 509   return 1;
 510 }
 511
 512 static const luaL_reg window_metamethods[] = {
 513   {"__tostring", window_tostring},
 514   {"__eq", window_equality},
 515   {"__gc", screen_object_collect},
 516   {0, 0}
 517 };
 518
 519 static const struct Xet_reg window_setters[] = {
 520   {"title", 0, 0, window_change_title/*absolute setter*/},
 521   {"number", 0, 0, window_change_number/*absolute setter*/},
 522   {0, 0}
 523 };
 524
 525 static const struct Xet_reg window_getters[] = {
 526   {"title", get_string, offsetof(struct win, w_title) + 8},
 527   {"number", get_int, offsetof(struct win, w_number)},
 528   {"dir", get_string, offsetof(struct win, w_dir)},
 529   {"tty", get_string, offsetof(struct win, w_tty)},
 530   {"pid", get_int, offsetof(struct win, w_pid)},
 531   {"group", get_window, offsetof(struct win, w_group)},
 532   {"bell", get_int, offsetof(struct win, w_bell)},
 533   {0, 0}
 534 };
 535
 536
 537 /** }}} */
 538
 539 /** AclUser {{{ */
 540
 541 PUSH_TYPE(user, struct acluser)
 542
 543 CHECK_TYPE(user, struct acluser)
 544
 545 static int
 546 get_user(lua_State *L, void *v)
 547 {
 548   push_user(L, (struct acluser **)v);
 549   return 1;
 550 }
 551
 552 static const luaL_reg user_methods[] = {
 553   {0, 0}
 554 };
 555
 556 static int
 557 user_tostring(lua_State *L)
 558 {
 559   char str[128];
 560   struct acluser *u = check_user(L, 1);
 561   snprintf(str, sizeof(str), "{user '%s'}", u->u_name);
 562   lua_pushstring(L, str);
 563   return 1;
 564 }
 565
 566 static const luaL_reg user_metamethods[] = {
 567   {"__tostring", user_tostring},
 568   {"__gc", screen_object_collect},
 569   {0, 0}
 570 };
 571
 572 static const struct Xet_reg user_setters[] = {
 573   {0, 0}
 574 };
 575
 576 static const struct Xet_reg user_getters[] = {
 577   {"name", get_string, offsetof(struct acluser, u_name)},
 578   {"password", get_string, offsetof(struct acluser, u_password)},
 579   {0, 0}
 580 };
 581
 582 /** }}} */
 583
 584 static int get_display(lua_State *L, void *v);
 585 /** Canvas {{{ */
 586
 587 PUSH_TYPE(canvas, struct canvas)
 588
 589 CHECK_TYPE(canvas, struct canvas)
 590
 591 static int
 592 get_canvas(lua_State *L, void *v)
 593 {
 594   push_canvas(L, (struct canvas **)v);
 595   return 1;
 596 }
 597
 598 static int
 599 canvas_select(lua_State *L)
 600 {
 601   struct canvas *c = check_canvas(L, 1);
 602   if (!display || D_forecv == c)
 603     return 0;
 604   /* FIXME: why do we need this? */
 605   SetCanvasWindow(c, Layer2Window(c->c_layer));
 606
 607   FocusCanvas(c);
 608   return 0;
 609 }
 610
 611 static int
 612 canvas_split(lua_State *L)
 613 {
 614   struct canvas *c = check_canvas(L, 1);
 615   int hori = lua_toboolean(L, 2);
 616   if (hori)
 617     AddCanvas(SLICE_HORI);
 618   else
 619     AddCanvas(SLICE_VERT);
 620   Activate(-1);
 621   return 0;
 622 }
 623
 624 static int
 625 canvas_showwin(lua_State *L)
 626 {
 627   struct canvas *c = check_canvas(L, 1);
 628   if (lua_isnil(L, 2))
 629     SetCanvasWindow(c, 0);
 630   else
 631     {
 632       struct win *w = check_window(L, 2);
 633       SetCanvasWindow(c, w);
 634     }
 635   return 0;
 636 }
 637
 638 static const luaL_reg canvas_methods[] = {
 639   {"select", canvas_select},
 640   {"split", canvas_split},
 641   {"showwin", canvas_showwin},
 642   {0, 0}
 643 };
 644
 645 static const luaL_reg canvas_metamethods[] = {
 646   {"__gc", screen_object_collect},
 647   {0, 0}
 648 };
 649
 650 extern struct mchar mchar_so;
 651 static int
 652 canvas_update_caption(lua_State *L)
 653 {
 654   struct canvas *cv = check_canvas(L, 1);
 655   unsigned int len;
 656   const char *caption = luaL_checklstring(L, 3, &len);
 657   int l, padlen;
 658   padlen = cv->c_xe - cv->c_xs +
 659     (display ? (cv->c_xe + 1 < D_width || D_CLP): 0);
 660   struct win *w = Layer2Window(cv->c_layer);
 661   char * buf = MakeWinMsgEv((char *)caption, w, '%', padlen, &cv->c_captev, 0);
 662   if (cv->c_captev.timeout.tv_sec)
 663     evenq(&cv->c_captev);
 664   l = strlen(buf);
 665
 666   GotoPos(cv->c_xs, cv->c_ye+1);
 667   /*XXX:what does this mean?*/
 668   SetRendition(&mchar_so);
 669   if (l > cv->c_xe - cv->c_xs + 1)
 670     l = cv->c_xe - cv->c_xs + 1;
 671   PutWinMsg(buf, cv->c_xs, l);
 672   l += cv->c_xs;
 673   for (; l <= cv->c_xe; l++)
 674     PUTCHARLP(' ');
 675
 676   return 0;
 677 }
 678
 679 static const struct Xet_reg canvas_setters[] = {
 680   {"caption", 0, 0, canvas_update_caption/*absolute setter*/},
 681   {0, 0}
 682 };
 683
 684 static int
 685 canvas_get_window(lua_State *L)
 686 {
 687   struct canvas *c = check_canvas(L, 1);
 688   struct win *win = Layer2Window(c->c_layer);
 689   if (win)
 690     push_window(L, &win);
 691   else
 692     lua_pushnil(L);
 693   return 1;
 694 }
 695
 696 static const struct Xet_reg canvas_getters[] = {
 697   {"next", get_canvas, offsetof(struct canvas, c_next)},
 698   {"xoff", get_int, offsetof(struct canvas, c_xoff)},
 699   {"yoff", get_int, offsetof(struct canvas, c_yoff)},
 700   {"xs", get_int, offsetof(struct canvas, c_xs)},
 701   {"ys", get_int, offsetof(struct canvas, c_ys)},
 702   {"xe", get_int, offsetof(struct canvas, c_xe)},
 703   {"ye", get_int, offsetof(struct canvas, c_ye)},
 704   {"window", 0, 0, canvas_get_window},
 705   {"display", get_display, offsetof(struct canvas, c_display)},
 706   {0, 0}
 707 };
 708
 709 /** }}} */
 710
 711 /** Layout {{{ */
 712
 713 PUSH_TYPE(layout, struct layout)
 714 CHECK_TYPE(layout, struct layout)
 715
 716 static const struct Xet_reg layout_getters[] = {
 717   {"title", get_string, offsetof(struct layout, lay_title)},
 718   {"number", get_string, offsetof(struct layout, lay_title)},
 719   {"autosave", get_string, offsetof(struct layout, lay_autosave)},
 720   {0,0}
 721 };
 722
 723 int
 724 layout_change_title(lua_State *L)
 725 {
 726   struct layout *lay = check_layout(L, 1);
 727   unsigned int len;
 728   const char *title = luaL_checklstring(L, 3, &len);
 729   free(lay->lay_title);
 730   lay->lay_title= SaveStr(title);
 731   return 0;
 732 }
 733
 734 void LayoutChangeNumber(struct layout *lay, int newnum);
 735
 736 int
 737 layout_change_number(lua_State *L)
 738 {
 739   struct layout *lay = check_layout(L, 1);
 740   int newnum = luaL_checkint(L, 3);
 741   LayoutChangeNumber(lay, newnum);
 742   return 0;
 743 }
 744
 745 static const struct Xet_reg layout_setters[] = {
 746   {"title", 0, 0, layout_change_title/*absolute setter*/},
 747   {"number", 0, 0, layout_change_number/*absolute setter*/},
 748   {"autosave", get_string, offsetof(struct layout, lay_autosave)},
 749   {0, 0}
 750 };
 751
 752 int
 753 layout_select(lua_State *L)
 754 {
 755   struct layout *lay = check_layout(L, 1);
 756   if (!display) return;
 757   LoadLayout(lay, &D_canvas);
 758   Activate(0);
 759   return 0;
 760 }
 761
 762 static const luaL_reg layout_methods[] = {
 763   {"select", layout_select},
 764   {0, 0}
 765 };
 766
 767 static const luaL_reg layout_metamethods[] = {
 768   {"__gc", screen_object_collect},
 769   {0, 0}
 770 };
 771
 772 static int
 773 get_layout(lua_State *L, void *v)
 774 {
 775   push_layout(L, (struct layout **)v);
 776   return 1;
 777 }
 778
 779 /** }}} */
 780
 781 /** Display {{{ */
 782
 783 PUSH_TYPE(display, struct display)
 784
 785 CHECK_TYPE(display, struct display)
 786
 787 static int
 788 get_display(lua_State *L, void *v)
 789 {
 790   push_display(L, (struct display **)v);
 791   return 1;
 792 }
 793
 794 static int
 795 display_get_canvases(lua_State *L)
 796 {
 797   struct display *d;
 798   struct canvas *iter;
 799   int count;
 800
 801   d = check_display(L, 1);
 802   lua_newtable(L);
 803   for (iter = d->d_cvlist, count = 0; iter; iter = iter->c_next, count++) {
 804     lua_pushinteger(L, count);
 805     push_canvas(L, &iter);
 806     lua_settable(L, -3);
 807   }
 808
 809   return 1;
 810 }
 811
 812 static int
 813 display_top_canvas(lua_State *L)
 814 {
 815   struct display *d;
 816   d = check_display(L, 1);
 817   push_canvas(L, &d->d_cvlist);
 818
 819   return 1;
 820 }
 821
 822 static int
 823 display_bot_canvas(lua_State *L)
 824 {
 825   struct display *d;
 826   struct canvas *c;
 827   d = check_display(L, 1);
 828
 829   for (c = d->d_cvlist; c->c_next; c = c->c_next)
 830     ;
 831   push_canvas(L, &c);
 832
 833   return 1;
 834 }
 835
 836 static const luaL_reg display_methods[] = {
 837   {"get_canvases", display_get_canvases},
 838   {"top_canvas", display_top_canvas},
 839   {"bottom_canvas", display_bot_canvas},
 840   {0, 0}
 841 };
 842
 843 static int
 844 display_tostring(lua_State *L)
 845 {
 846   char str[128];
 847   struct display *d = check_display(L, 1);
 848   snprintf(str, sizeof(str), "{display: tty = '%s', term = '%s'}", d->d_usertty, d->d_termname);
 849   lua_pushstring(L, str);
 850   return 1;
 851 }
 852
 853 static const luaL_reg display_metamethods[] = {
 854   {"__tostring", display_tostring},
 855   {"__gc", screen_object_collect},
 856   {0, 0}
 857 };
 858
 859 static int
 860 display_new_idle_timeout(lua_State *L)
 861 {
 862   struct display *disp = check_display(L, 1);
 863   int timeout = luaL_checkinteger(L, 3) * 1000;
 864   struct event *ev = &disp->d_idleev;
 865   if (timeout > 0)
 866     {
 867       SetTimeout(ev, timeout);
 868       if (!ev->queued)
 869         evenq(ev);
 870     }
 871   else
 872     evdeq(ev);
 873
 874   return 0;
 875 }
 876
 877 static const struct Xet_reg display_setters[] = {
 878   {"idle_timeout", 0, 0, display_new_idle_timeout/*absolute setter*/},
 879   {0, 0}
 880 };
 881
 882 static const struct Xet_reg display_getters[] = {
 883   {"tty", get_string, offsetof(struct display, d_usertty)},
 884   {"term", get_string, offsetof(struct display, d_termname)},
 885   {"fore", get_window, offsetof(struct display, d_fore)},
 886   {"other", get_window, offsetof(struct display, d_other)},
 887   {"width", get_int, offsetof(struct display, d_width)},
 888   {"height", get_int, offsetof(struct display, d_height)},
 889   {"user", get_user, offsetof(struct display, d_user)},
 890   {"layout", get_layout, offsetof(struct display, d_layout)},
 891   {0, 0}
 892 };
 893
 894 /** }}} */
 895
 896 /** Screen {{{ */
 897
 898 static int
 899 screen_get_windows(lua_State *L)
 900 {
 901   struct win *iter;
 902   int count;
 903
 904   lua_newtable(L);
 905   for (iter = windows, count = 0; iter; iter = iter->w_next, count++) {
 906     lua_pushinteger(L, iter->w_number);
 907     push_window(L, &iter);
 908     lua_settable(L, -3);
 909   }
 910
 911   return 1;
 912 }
 913
 914 static int
 915 screen_get_displays(lua_State *L)
 916 {
 917   struct display *iter;
 918   int count;
 919
 920   lua_newtable(L);
 921   for (iter = displays, count = 0; iter; iter = iter->d_next, count++) {
 922     lua_pushinteger(L, count);
 923     push_display(L, &iter);
 924     lua_settable(L, -3);
 925   }
 926
 927   return 1;
 928 }
 929
 930 extern struct layout *layouts;
 931 static int
 932 screen_get_layouts(lua_State *L)
 933 {
 934   struct layout *iter;
 935   int count;
 936
 937   lua_newtable(L);
 938   for (iter = layouts, count = 0; iter; iter = iter->lay_next, count++) {
 939     lua_pushinteger(L, iter->lay_number);
 940     push_layout(L, &iter);
 941     lua_settable(L, -3);
 942   }
 943
 944   return 1;
 945 }
 946
 947 static int
 948 screen_get_display(lua_State *L)
 949 {
 950   push_display(L, &display);
 951   return 1;
 952 }
 953
 954 static int
 955 screen_exec_command(lua_State *L)
 956 {
 957   const char *command;
 958   unsigned int len;
 959
 960   command = luaL_checklstring(L, 1, &len);
 961   if (command)
 962     RcLine((char *)command, len);
 963
 964   return 0;
 965 }
 966
 967 static int
 968 screen_append_msg(lua_State *L)
 969 {
 970   const char *msg, *color;
 971   unsigned int len;
 972   msg = luaL_checklstring(L, 1, &len);
 973   if (lua_isnil(L, 2))
 974     color = NULL;
 975   else
 976     color = luaL_checklstring(L, 2, &len);
 977   AppendWinMsgRend(msg, color);
 978   return 0;
 979 }
 980
 981 struct sinput_data
 982 {
 983   lua_State *L;
 984   lua_handler lh;
 985 };
 986
 987 void
 988 script_input_fn(char *buf, int len, char *priv)
 989 {
 990   struct sinput_data *sidata = (struct sinput_data *)priv;
 991   lua_handler lh = sidata->lh;
 992   lua_State *L = sidata->L;
 993
 994   LuaPushHandler(L, lh);
 995   lua_pushstring(L, buf);
 996   if (lua_pcall(L, 1, 0, 0) == LUA_ERRRUN)
 997     {
 998       if(lua_isstring(L, -1))
 999         {
1000           LuaShowErr(L);
1001         }
1002     }
1003   free(sidata);
1004   LuaFreeHandler(L, &lh);
1005 }
1006
1007 static int
1008 screen_input(lua_State *L)
1009 {
1010   char *ss;
1011   int n;
1012   const char * prompt = NULL, *prefill = NULL;
1013   lua_handler lh;
1014   struct sinput_data *sidata;
1015
1016   prompt = luaL_checkstring(L, 1);
1017   lh = LuaCheckHandler(L, 2, 1);
1018   if (!lh)
1019     luaL_error(L, "Out of Memory");
1020
1021   if (lua_gettop(L) >= 3)
1022     prefill = luaL_checkstring(L, 3);
1023
1024
1025   sidata = (struct sinput_data *)malloc(sizeof(struct sinput_data));
1026   if (!sidata)
1027     {
1028       LuaFreeHandler(L, &lh);
1029       luaL_error(L, "Out of Memory");
1030     }
1031
1032   sidata->L = L;
1033   sidata->lh = lh;
1034   Input((char *)prompt, 100, INP_COOKED, script_input_fn, (char *)sidata, 0);
1035
1036   if (!prefill)
1037     return 0;
1038   for (; *prefill; prefill++)
1039     {
1040       if ((*(unsigned char *)prefill & 0x7f) < 0x20 || *prefill == 0x7f)
1041         continue;
1042       ss = (char *)prefill;
1043       n = 1;
1044       LayProcess(&ss, &n);
1045     }
1046   return 0;
1047 }
1048
1049 static void
1050 sev_schedule_fn(struct event *ev, char *data)
1051 {
1052   struct sinput_data *si = (struct sinput_data *)data;
1053   lua_handler lh = si->lh;
1054   lua_State *L = si->L;
1055   free(si);
1056   evdeq(ev);
1057   Free(ev);
1058
1059   LuaPushHandler(L, lh);
1060   if (lua_pcall(L, 1, 0, 0) == LUA_ERRRUN)
1061     {
1062       if(lua_isstring(L, -1))
1063         {
1064           LuaShowErr(L);
1065         }
1066     }
1067   LuaFreeHandler(L, &lh);
1068 }
1069
1070 static int
1071 screen_schedule(lua_State *L)
1072 {
1073   int timeout = luaL_checkinteger(L, 1);
1074   lua_handler lh = LuaCheckHandler(L, 2, 1);
1075   struct sinput_data *si;
1076   struct event *ev;
1077   if (timeout <= 0)
1078     return 0;
1079
1080   ev = (struct event *) calloc(1, sizeof(struct event));
1081   if (!ev)
1082     {
1083       LuaFreeHandler(L, &lh);
1084       luaL_error(L, "Out of Memory");
1085     }
1086   si = (struct sinput_data *) malloc(sizeof(struct sinput_data));
1087   if (!si)
1088     {
1089       LuaFreeHandler(L, &lh);
1090       Free(ev);
1091       luaL_error(L, "Out of Memory");
1092     }
1093   si->lh = lh;
1094   si->L = L;
1095
1096   ev->type = EV_TIMEOUT;
1097   ev->data = (char *)si;
1098   ev->handler = sev_schedule_fn;
1099   evenq(ev);
1100   SetTimeout(ev, timeout * 1000);
1101   return 0;
1102 }
1103
1104 static const luaL_reg screen_methods[] = {
1105   {"windows", screen_get_windows},
1106   {"displays", screen_get_displays},
1107   {"layouts", screen_get_layouts},
1108   {"display", screen_get_display},
1109   {"command", screen_exec_command},
1110   {"append_msg", screen_append_msg},
1111   {"hook", LuaRegEvent},
1112   {"input", screen_input},
1113   {"schedule", screen_schedule},
1114   {0, 0}
1115 };
1116
1117 static const luaL_reg screen_metamethods[] = {
1118   {0, 0}
1119 };
1120
1121 static const struct Xet_reg screen_setters[] = {
1122   {0, 0}
1123 };
1124
1125 static const struct Xet_reg screen_getters[] = {
1126   {0, 0}
1127 };
1128
1129 /** }}} */
1130
1131 /** Public functions {{{ */
1132
1133 /* FIXME: This code only tracks one unhook ticket for a lua func.
1134  * So it does not work if one func is registered more than one times. */
1135 static void
1136 prepare_weak_table(lua_State *L, const char *name, const char *mode)
1137 {
1138   luaL_getmetatable(L, "screen");
1139
1140   lua_pushstring(L, name);
1141   lua_newtable(L);
1142
1143   /* prepare a metatable to indicate weak table */
1144   lua_newtable(L);
1145   lua_pushstring(L, "__mode");
1146   lua_pushstring(L, mode);
1147   lua_rawset(L, -3);
1148   /* Mark weak table */
1149   lua_setmetatable(L, -2);
1150   lua_rawset(L, -3);
1151   lua_pop(L, 1);
1152 }
1153
1154 static lua_State *L;
1155 int LuaInit(void)
1156 {
1157   L = luaL_newstate();
1158
1159   luaL_openlibs(L);
1160
1161 #define REGISTER(X) struct_register(L, #X , X ## _methods, X##_metamethods, X##_setters, X##_getters)
1162
1163   REGISTER(screen);
1164   REGISTER(window);
1165   REGISTER(display);
1166   REGISTER(user);
1167   REGISTER(canvas);
1168   REGISTER(callback);
1169
1170   /* To store handler funcs */
1171
1172   /*_two kinds of information are mantained:
1173    *
1174    * funcreg[key]->func
1175    * The 'func' part of the tables are weak. That means the registered funcs
1176    * will be collected once the func is no longer available (e.g. overwritten
1177    * by a new instance of the script)
1178    *
1179    * To make this process happens faster, GC is forced at the end of each
1180    * source.
1181    * TODO: What if some events are triggered within the sourcing
1182    * procedure?
1183    * */
1184   prepare_weak_table(L, "_funcreg", "v");
1185
1186   /* funcunhook[func]->listener
1187    * The listener is the unhook ticket of the hook. which should be collected
1188    * once the func is collected. The gc metamethod will be triggered
1189    * accordingly. */
1190   prepare_weak_table(L, "_funcunhook", "k");
1191
1192   return 0;
1193 }
1194
1195 /* An error message on top of the stack. */
1196 static void
1197 LuaShowErr(lua_State *L)
1198 {
1199   struct display *d = display;
1200   unsigned int len;
1201   const char *message = luaL_checklstring(L, -1, &len);
1202   lua_pop(L, 1);
1203   LMsg(0, "%s", message ? message : "Unknown error");
1204   display = d;
1205 }
1206
1207 struct fn_def
1208 {
1209   void (*push_fn)(lua_State *, void*);
1210   void *value;
1211 };
1212
1213 static int
1214 LuaCallProcess(const char *name, struct fn_def defs[])
1215 {
1216   int argc = 0;
1217
1218   lua_getfield(L, LUA_GLOBALSINDEX, name);
1219   if (lua_isnil(L, -1))
1220     {
1221       lua_pop(L,1);
1222       return 0;
1223     }
1224   for (argc = 0; defs[argc].push_fn; argc++)
1225     defs[argc].push_fn(L, defs[argc].value);
1226   if (lua_pcall(L, argc, 0, 0) == LUA_ERRRUN && lua_isstring(L, -1))
1227     {
1228       LuaShowErr(L);
1229       return 0;
1230     }
1231   return 1;
1232 }
1233
1234 /* FIXME: Think about this: will it affect the registered handlers?*/
1235 int LuaSource(const char *file, int async)
1236 {
1237   if (!L)
1238     return 0;
1239   struct stat st;
1240   if (stat(file, &st) == -1)
1241     Msg(errno, "Error loading lua script file '%s'", file);
1242   else
1243     {
1244       int len = strlen(file);
1245       if (len < 4 || strncmp(file + len - 4, ".lua", 4) != 0)
1246         return 0;
1247       if (luaL_dofile(L, file) && lua_isstring(L, -1))
1248         {
1249           LuaShowErr(L);
1250           return 0;
1251         }
1252       else
1253         {
1254           /* It seems that I need two GC passes to really collect the unhook
1255            * ticket, after changing the reference to ticket in the
1256            * 'funcunhook' table from weak to strong. This should not be
1257            * harmful, but how can I make sure that two passes is enough?
1258            *
1259            * Possible reason:
1260            * This seems reasonable, since the first pass will collect the func
1261            * itself and make the ticket garbage, and the second pass will
1262            * collect the ticket itself.
1263            *
1264            * TODO: check this out. maybe ask some lua gurus. */
1265           lua_gc(L, LUA_GCCOLLECT, 0);
1266           lua_gc(L, LUA_GCCOLLECT, 0);
1267         }
1268       return 1;
1269     }
1270   return 0;
1271 }
1272
1273 int LuaFinit(void)
1274 {
1275   if (!L)
1276     return 0;
1277   lua_close(L);
1278   L = (lua_State*)0;
1279   return 0;
1280 }
1281
1282 static void
1283 push_stringarray(lua_State *L, char **args)
1284 {
1285   int i;
1286   lua_newtable(L);
1287   for (i = 1; args && *args; i++) {
1288     lua_pushinteger(L, i);
1289     lua_pushstring(L, *args++);
1290     lua_settable(L, -3);
1291   }
1292 }
1293
1294 int
1295 LuaPushParams(lua_State *L, const char *params, va_list va)
1296 {
1297   int num = 0;
1298   while (*params)
1299     {
1300       switch (*params)
1301         {
1302         case 's':
1303           lua_pushstring(L, va_arg(va, char *));
1304           break;
1305         case 'S':
1306           push_stringarray(L, va_arg(va, char **));
1307           break;
1308         case 'i':
1309           lua_pushinteger(L, va_arg(va, int));
1310           break;
1311         case 'd':
1312           {
1313             struct display *d = va_arg(va, struct display *);
1314             push_display(L, &d);
1315             break;
1316           }
1317         case 'w':
1318           {
1319             struct win *w = va_arg(va, struct win *);
1320             push_window(L, &w);
1321             break;
1322           }
1323         case 'c':
1324           {
1325             struct canvas *c = va_arg(va, struct canvas *);
1326             push_canvas(L, &c);
1327             break;
1328           }
1329         }
1330       params++;
1331       num++;
1332     }
1333   return num;
1334 }
1335
1336 int LuaCall(const char *func, const char **argv)
1337 {
1338   int argc;
1339   if (!L)
1340     return 0;
1341
1342   StackDump(L, "Before LuaCall\n");
1343   lua_getfield(L, LUA_GLOBALSINDEX, func);
1344   if (lua_isnil(L, -1))
1345     {
1346       lua_pop(L, 1);
1347       lua_pushstring(L, "Could not find the script function\n");
1348       LuaShowErr(L);
1349       return 0;
1350     }
1351   for (argc = 0; *argv; argv++, argc++)
1352     {
1353       lua_pushstring(L, *argv);
1354     }
1355   if (lua_pcall(L, argc, 0, 0) == LUA_ERRRUN)
1356     {
1357       if(lua_isstring(L, -1))
1358         {
1359           StackDump(L, "After LuaCall\n");
1360           LuaShowErr(L);
1361           return 0;
1362         }
1363     }
1364   return 1;
1365 }
1366
1367 /*** Lua callback handler management {{{ */
1368
1369 int
1370 LuaPushHTable(lua_State *L, int screen, const char * t)
1371 {
1372   lua_pushstring(L, t);
1373   lua_rawget(L, screen);
1374   /* FIXME: Do we need to balance the stack here? */
1375   if (lua_isnil(L, -1))
1376     luaL_error(L, "Fatal! Fail to get function registeration table!");
1377   return lua_gettop(L);
1378 }
1379
1380 void
1381 LuaPushHandler(lua_State *L, lua_handler lh)
1382 {
1383   int funcreg;
1384   if (lh->type == LUA_HANDLER_TYPE_F)
1385     {
1386       luaL_getmetatable(L, "screen");
1387       funcreg = LuaPushHTable(L, lua_gettop(L), "_funcreg");
1388       lua_rawgeti(L, funcreg, lh->u.reference);
1389       lua_replace(L, -3);
1390       lua_pop(L, 1);
1391     }
1392   else
1393     {
1394       lua_getfield(L, LUA_GLOBALSINDEX, lh->u.name);
1395     }
1396 }
1397
1398 int
1399 LuaFuncKey(lua_State *L, int idx, int ref)
1400 {
1401   int key, funcreg, sc;
1402   luaL_getmetatable(L, "screen");
1403   sc = lua_gettop(L);
1404   funcreg = LuaPushHTable(L, sc, "_funcreg");
1405
1406   lua_pushvalue(L, idx);
1407   key = luaL_ref(L, funcreg);
1408   lua_pop(L, 2);
1409   return key;
1410 }
1411
1412 void
1413 LuaHUnRef(lua_State *L, int key)
1414 {
1415   int funcreg, sc;
1416   luaL_getmetatable(L, "screen");
1417   sc = lua_gettop(L);
1418   funcreg = LuaPushHTable(L, sc, "_funcreg");
1419   luaL_unref(L, funcreg, key);
1420 }
1421
1422 lua_handler
1423 LuaCheckHandler(lua_State *L, int idx, int ref)
1424 {
1425   int key;
1426   if (idx < 0)
1427     idx = lua_gettop(L) + 1 - idx;
1428
1429   if (lua_isstring(L, idx))
1430     {
1431       const char * handler;
1432       /* registered with func name.*/
1433       handler = luaL_checkstring(L, idx);
1434       lua_getfield(L, LUA_GLOBALSINDEX, handler);
1435       if (!lua_isfunction(L, -1))
1436         luaL_error(L, "The specified handler %s in param #%d is not a function", handler, idx);
1437       lua_pop(L, 1);
1438       return LuaAllocHandler(handler, 0);
1439     }
1440   else if (!lua_isfunction(L, idx))
1441     luaL_error(L, "Handler should be a function or the name of function");
1442
1443   key = LuaFuncKey(L, idx, ref);
1444   return LuaAllocHandler(NULL, key);
1445 }
1446
1447 /* }}} **/
1448
1449 static int
1450 LuaDispatch(void *handler, const char *params, va_list va)
1451 {
1452   lua_handler lh = (lua_handler)handler;
1453   int argc, retvalue;
1454
1455   StackDump(L, "before dispatch");
1456
1457   LuaPushHandler(L, lh);
1458   if (lua_isnil(L, -1))
1459     {
1460       lua_pop(L, 1);
1461       return 0;
1462     }
1463   argc = LuaPushParams(L, params, va);
1464
1465   if (lua_pcall(L, argc, 1, 0) == LUA_ERRRUN && lua_isstring(L, -1))
1466     {
1467       StackDump(L, "After LuaDispatch\n");
1468       LuaShowErr(L);
1469       return 0;
1470     }
1471   retvalue = lua_tonumber(L, -1);
1472   lua_pop(L, 1);
1473   return retvalue;
1474 }
1475
1476 /*FIXME: what if a func is registered twice or more? */
1477 void
1478 LuaRegAutoUnHook(lua_State *L, lua_handler lh, int ticket)
1479 {
1480   int sc, funcunhook;
1481   luaL_getmetatable(L, "screen");
1482   sc = lua_gettop(L);
1483   funcunhook = LuaPushHTable(L, sc, "_funcunhook");
1484   LuaPushHandler(L, lh);
1485   lua_pushvalue(L, ticket);
1486   lua_rawset(L, funcunhook);
1487   lua_pop(L, 2);
1488 }
1489
1490 #define SEVNAME_MAX 30
1491 static int
1492 LuaRegEvent(lua_State *L)
1493 {
1494   /* signature: hook(obj, event, handler, priv);
1495    *        or: hook(event, handler, priv)
1496    *   returns: A ticket for later unregister. */
1497   int idx = 1, argc = lua_gettop(L);
1498   unsigned int priv = 31; /* Default privilege */
1499   lua_handler lh;
1500
1501   char *obj = NULL;
1502   const char *objname = "global";
1503
1504   static char evbuf[SEVNAME_MAX];
1505   const char *event;
1506
1507   struct script_event *sev;
1508
1509   StackDump(L, "Before RegEvent\n");
1510
1511   /* Identify the object, if specified */
1512   if (luaL_getmetafield(L, 1, "_objname"))
1513     {
1514       objname = luaL_checkstring(L, -1);
1515       lua_pop(L, 1);
1516       if (!strcmp("screen", objname))
1517         objname = "global";
1518       else
1519         obj = *(char **)lua_touserdata(L, 1);
1520       idx++;
1521     }
1522
1523   event = luaL_checkstring(L, idx++);
1524   snprintf(evbuf, SEVNAME_MAX, "%s_%s", objname, event);
1525
1526   /* Check and get the handler */
1527   lh = LuaCheckHandler(L, idx++, 1);
1528   if (!lh)
1529     luaL_error(L, "Out of memory");
1530
1531   StackDump(L, "In RegEvent\n");
1532
1533   if (idx <= argc)
1534     priv = luaL_checkinteger(L, idx);
1535
1536   sev = object_get_event(obj, evbuf);
1537   if (sev)
1538     {
1539       struct listener *l;
1540       int ticket;
1541       l = (struct listener *)malloc(sizeof(struct listener));
1542       if (!l)
1543         return luaL_error(L, "Out of memory");
1544       l->priv = priv;
1545       l->bd = &lua_binding;
1546       l->handler = (void *)lh;
1547       register_listener(sev, l);
1548       /* Return the ticket for un-register */
1549       push_callback(L, &l);
1550       ticket = lua_gettop(L);
1551
1552       LuaRegAutoUnHook(L, lh, ticket);
1553     }
1554   else
1555     return luaL_error(L, "Invalid event specified: %s for object %s", event, objname);
1556
1557   StackDump(L, "After RegEvent\n");
1558   return 1;
1559 }
1560
1561 /** }}} */
1562
1563 struct binding lua_binding =
1564 {
1565     "lua", /*name*/
1566     0,     /*inited*/
1567     0,     /*registered*/
1568     LuaInit,
1569     LuaFinit,
1570     LuaCall,
1571     LuaSource,
1572     LuaDispatch,
1573     0,     /*b_next*/
1574 };
1575