luaa.c

   1 /*
   2  * luaa.c - Lua configuration management
   3  *
   4  * Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #define _GNU_SOURCE
  23
  24 #include <ev.h>
  25
  26 #include <lua.h>
  27 #include <lauxlib.h>
  28 #include <lualib.h>
  29
  30 #include <basedir_fs.h>
  31
  32 #include "awesome.h"
  33 #include "timer.h"
  34 #include "awesome-version-internal.h"
  35 #include "ewmh.h"
  36 #include "luaa.h"
  37 #include "spawn.h"
  38 #include "tag.h"
  39 #include "client.h"
  40 #include "screen.h"
  41 #include "event.h"
  42 #include "selection.h"
  43 #include "window.h"
  44 #include "common/xcursor.h"
  45 #include "common/buffer.h"
  46
  47 #ifdef WITH_DBUS
  48 extern const struct luaL_reg awesome_dbus_lib[];
  49 #endif
  50 extern const struct luaL_reg awesome_hooks_lib[];
  51 extern const struct luaL_reg awesome_keygrabber_lib[];
  52 extern const struct luaL_reg awesome_mousegrabber_lib[];
  53 extern const struct luaL_reg awesome_root_lib[];
  54 extern const struct luaL_reg awesome_mouse_methods[];
  55 extern const struct luaL_reg awesome_mouse_meta[];
  56 extern const struct luaL_reg awesome_screen_methods[];
  57 extern const struct luaL_reg awesome_screen_meta[];
  58
  59 /** Quit awesome.
  60  * \param L The Lua VM state.
  61  * \return The number of elements pushed on stack.
  62  */
  63 static int
  64 luaA_quit(lua_State *L __attribute__ ((unused)))
  65 {
  66     ev_unloop(globalconf.loop, 1);
  67     return 0;
  68 }
  69
  70 /** Execute another application, probably a window manager, to replace
  71  * awesome.
  72  * \param L The Lua VM state.
  73  * \return The number of elements pushed on stack.
  74  * \luastack
  75  * \lparam The command line to execute.
  76  */
  77 static int
  78 luaA_exec(lua_State *L)
  79 {
  80     const char *cmd = luaL_checkstring(L, 1);
  81
  82     awesome_atexit();
  83
  84     a_exec(cmd);
  85     return 0;
  86 }
  87
  88 /** Restart awesome.
  89  */
  90 static int
  91 luaA_restart(lua_State *L __attribute__ ((unused)))
  92 {
  93     awesome_restart();
  94     return 0;
  95 }
  96
  97 /** UTF-8 aware string length computing.
  98  * \param L The Lua VM state.
  99  * \return The number of elements pushed on stack.
 100  */
 101 static int
 102 luaA_mbstrlen(lua_State *L)
 103 {
 104     const char *cmd = luaL_checkstring(L, 1);
 105     lua_pushnumber(L, (ssize_t) mbstowcs(NULL, NONULL(cmd), 0));
 106     return 1;
 107 }
 108
 109 /** Overload standard Lua next function to use __next key on metatable.
 110  * \param L The Lua VM state.
 111  * \return The number of elements pushed on stack.
 112  */
 113 static int
 114 luaAe_next(lua_State *L)
 115 {
 116     if(luaL_getmetafield(L, 1, "__next"))
 117     {
 118         lua_insert(L, 1);
 119         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 120         return lua_gettop(L);
 121     }
 122
 123     luaL_checktype(L, 1, LUA_TTABLE);
 124     lua_settop(L, 2);
 125     if(lua_next(L, 1))
 126         return 2;
 127     lua_pushnil(L);
 128     return 1;
 129 }
 130
 131 /** Overload lua_next() function by using __next metatable field
 132  * to get next elements.
 133  * \param L The Lua VM stack.
 134  * \param idx The index number of elements in stack.
 135  * \return 1 if more elements to come, 0 otherwise.
 136  */
 137 int
 138 luaA_next(lua_State *L, int idx)
 139 {
 140     if(luaL_getmetafield(L, idx, "__next"))
 141     {
 142         /* if idx is relative, reduce it since we got __next */
 143         if(idx < 0) idx--;
 144         /* copy table and then move key */
 145         lua_pushvalue(L, idx);
 146         lua_pushvalue(L, -3);
 147         lua_remove(L, -4);
 148         lua_pcall(L, 2, 2, 0);
 149         /* next returned nil, it's the end */
 150         if(lua_isnil(L, -1))
 151         {
 152             /* remove nil */
 153             lua_pop(L, 2);
 154             return 0;
 155         }
 156         return 1;
 157     }
 158     else if(lua_istable(L, idx))
 159         return lua_next(L, idx);
 160     /* remove the key */
 161     lua_pop(L, 1);
 162     return 0;
 163 }
 164
 165 /** Generic pairs function.
 166  * \param L The Lua VM state.
 167  * \return The number of elements pushed on stack.
 168  */
 169 static int
 170 luaA_generic_pairs(lua_State *L)
 171 {
 172     lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
 173     lua_pushvalue(L, 1);  /* state, */
 174     lua_pushnil(L);  /* and initial value */
 175     return 3;
 176 }
 177
 178 /** Overload standard pairs function to use __pairs field of metatables.
 179  * \param L The Lua VM state.
 180  * \return The number of elements pushed on stack.
 181  */
 182 static int
 183 luaAe_pairs(lua_State *L)
 184 {
 185     if(luaL_getmetafield(L, 1, "__pairs"))
 186     {
 187         lua_insert(L, 1);
 188         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 189         return lua_gettop(L);
 190     }
 191
 192     luaL_checktype(L, 1, LUA_TTABLE);
 193     return luaA_generic_pairs(L);
 194 }
 195
 196 static int
 197 luaA_ipairs_aux(lua_State *L)
 198 {
 199     int i = luaL_checkint(L, 2) + 1;
 200     luaL_checktype(L, 1, LUA_TTABLE);
 201     lua_pushinteger(L, i);
 202     lua_rawgeti(L, 1, i);
 203     return (lua_isnil(L, -1)) ? 0 : 2;
 204 }
 205
 206 /** Overload standard ipairs function to use __ipairs field of metatables.
 207  * \param L The Lua VM state.
 208  * \return The number of elements pushed on stack.
 209  */
 210 static int
 211 luaAe_ipairs(lua_State *L)
 212 {
 213     if(luaL_getmetafield(L, 1, "__ipairs"))
 214     {
 215         lua_insert(L, 1);
 216         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 217         return lua_gettop(L);
 218     }
 219
 220     luaL_checktype(L, 1, LUA_TTABLE);
 221     lua_pushvalue(L, lua_upvalueindex(1));
 222     lua_pushvalue(L, 1);
 223     lua_pushinteger(L, 0);  /* and initial value */
 224     return 3;
 225 }
 226
 227 /** Enhanced type() function which recognize awesome objects.
 228  * \param L The Lua VM state.
 229  * \return The number of arguments pushed on the stack.
 230  */
 231 static int
 232 luaAe_type(lua_State *L)
 233 {
 234     luaL_checkany(L, 1);
 235     lua_pushstring(L, luaA_typename(L, 1));
 236     return 1;
 237 }
 238
 239 /** Replace various standards Lua functions with our own.
 240  * \param L The Lua VM state.
 241  */
 242 static void
 243 luaA_fixups(lua_State *L)
 244 {
 245     /* export string.wlen */
 246     lua_getglobal(L, "string");
 247     lua_pushcfunction(L, luaA_mbstrlen);
 248     lua_setfield(L, -2, "wlen");
 249     lua_pop(L, 1);
 250     /* replace next */
 251     lua_pushliteral(L, "next");
 252     lua_pushcfunction(L, luaAe_next);
 253     lua_settable(L, LUA_GLOBALSINDEX);
 254     /* replace pairs */
 255     lua_pushliteral(L, "pairs");
 256     lua_pushcfunction(L, luaAe_next);
 257     lua_pushcclosure(L, luaAe_pairs, 1); /* pairs get next as upvalue */
 258     lua_settable(L, LUA_GLOBALSINDEX);
 259     /* replace ipairs */
 260     lua_pushliteral(L, "ipairs");
 261     lua_pushcfunction(L, luaA_ipairs_aux);
 262     lua_pushcclosure(L, luaAe_ipairs, 1);
 263     lua_settable(L, LUA_GLOBALSINDEX);
 264     /* replace type */
 265     lua_pushliteral(L, "type");
 266     lua_pushcfunction(L, luaAe_type);
 267     lua_settable(L, LUA_GLOBALSINDEX);
 268     /* set selection */
 269     lua_pushliteral(L, "selection");
 270     lua_pushcfunction(L, luaA_selection_get);
 271     lua_settable(L, LUA_GLOBALSINDEX);
 272 }
 273
 274 /** __next function for wtable objects.
 275  * \param L The Lua VM state.
 276  * \return The number of elements pushed on stack.
 277  */
 278 static int
 279 luaA_wtable_next(lua_State *L)
 280 {
 281     /* upvalue 1 is content table */
 282     if(lua_next(L, lua_upvalueindex(1)))
 283         return 2;
 284     lua_pushnil(L);
 285     return 1;
 286 }
 287
 288 /** __ipairs function for wtable objects.
 289  * \param L The Lua VM state.
 290  * \return The number of elements pushed on stack.
 291  */
 292 static int
 293 luaA_wtable_ipairs(lua_State *L)
 294 {
 295     /* push ipairs_aux */
 296     lua_pushvalue(L, lua_upvalueindex(2));
 297     /* push content table */
 298     lua_pushvalue(L, lua_upvalueindex(1));
 299     lua_pushinteger(L, 0);  /* and initial value */
 300     return 3;
 301 }
 302
 303 /** Index function of wtable objects.
 304  * \param L The Lua VM state.
 305  * \return The number of elements pushed on stack.
 306  */
 307 static int
 308 luaA_wtable_index(lua_State *L)
 309 {
 310     size_t len;
 311     const char *buf;
 312
 313     lua_pushvalue(L, 2);
 314     /* check for size, waiting lua 5.2 and __len on tables */
 315     if((buf = lua_tolstring(L, -1, &len)))
 316         if(a_tokenize(buf, len) == A_TK_LEN)
 317         {
 318             lua_pushnumber(L, lua_objlen(L, lua_upvalueindex(1)));
 319             return 1;
 320         }
 321     lua_pop(L, 1);
 322
 323     /* upvalue 1 is content table */
 324     lua_rawget(L, lua_upvalueindex(1));
 325     return 1;
 326 }
 327
 328 /** Newndex function of wtable objects.
 329  * \param L The Lua VM state.
 330  * \return The number of elements pushed on stack.
 331  */
 332 static int
 333 luaA_wtable_newindex(lua_State *L)
 334 {
 335     bool invalid = false;
 336
 337     /* push key on top */
 338     lua_pushvalue(L, 2);
 339     /* get current key value in content table */
 340     lua_rawget(L, lua_upvalueindex(1));
 341     /* if value is a widget, notify change */
 342     if(lua_istable(L, -1) || luaA_toudata(L, -1, &widget_class))
 343         invalid = true;
 344
 345     lua_pop(L, 1); /* remove value */
 346
 347     /* if new value is a widget or a table */
 348     if(lua_istable(L, 3))
 349     {
 350         luaA_table2wtable(L);
 351         invalid = true;
 352     }
 353     else if(!invalid && luaA_toudata(L, 3, &widget_class))
 354         invalid = true;
 355
 356     /* upvalue 1 is content table */
 357     lua_rawset(L, lua_upvalueindex(1));
 358
 359     if(invalid)
 360         luaA_wibox_invalidate_byitem(L, lua_topointer(L, 1));
 361
 362     return 0;
 363 }
 364
 365 /** Convert the top element of the stack to a proxied wtable.
 366  * \param L The Lua VM state.
 367  */
 368 void
 369 luaA_table2wtable(lua_State *L)
 370 {
 371     if(!lua_istable(L, -1))
 372         return;
 373
 374     lua_newtable(L); /* create *real* content table */
 375     lua_createtable(L, 0, 5); /* metatable */
 376     lua_pushvalue(L, -2); /* copy content table */
 377     lua_pushcfunction(L, luaA_ipairs_aux); /* push ipairs aux */
 378     lua_pushcclosure(L, luaA_wtable_ipairs, 2);
 379     lua_pushvalue(L, -3); /* copy content table */
 380     lua_pushcclosure(L, luaA_wtable_next, 1); /* __next has the content table as upvalue */
 381     lua_pushvalue(L, -4); /* copy content table */
 382     lua_pushcclosure(L, luaA_wtable_index, 1); /* __index has the content table as upvalue */
 383     lua_pushvalue(L, -5); /* copy content table */
 384     lua_pushcclosure(L, luaA_wtable_newindex, 1); /* __newindex has the content table as upvalue */
 385     /* set metatable field with just pushed closure */
 386     lua_setfield(L, -5, "__newindex");
 387     lua_setfield(L, -4, "__index");
 388     lua_setfield(L, -3, "__next");
 389     lua_setfield(L, -2, "__ipairs");
 390     /* set metatable impossible to touch */
 391     lua_pushliteral(L, "wtable");
 392     lua_setfield(L, -2, "__metatable");
 393     /* set new metatable on original table */
 394     lua_setmetatable(L, -3);
 395
 396     /* initial key */
 397     lua_pushnil(L);
 398     /* go through original table */
 399     while(lua_next(L, -3))
 400     {
 401         /* if convert value to wtable */
 402         luaA_table2wtable(L);
 403         /* copy key */
 404         lua_pushvalue(L, -2);
 405         /* move key before value */
 406         lua_insert(L, -2);
 407         /* set same value in content table */
 408         lua_rawset(L, -4);
 409         /* copy key */
 410         lua_pushvalue(L, -1);
 411         /* push the new value :-> */
 412         lua_pushnil(L);
 413         /* set orig[k] = nil */
 414         lua_rawset(L, -5);
 415     }
 416     /* remove content table */
 417     lua_pop(L, 1);
 418 }
 419
 420 /** Look for an item: table, function, etc.
 421  * \param L The Lua VM state.
 422  * \param item The pointer item.
 423  */
 424 bool
 425 luaA_hasitem(lua_State *L, const void *item)
 426 {
 427     lua_pushnil(L);
 428     while(luaA_next(L, -2))
 429     {
 430         if(lua_topointer(L, -1) == item)
 431         {
 432             /* remove value and key */
 433             lua_pop(L, 2);
 434             return true;
 435         }
 436         if(lua_istable(L, -1))
 437             if(luaA_hasitem(L, item))
 438             {
 439                 /* remove key and value */
 440                 lua_pop(L, 2);
 441                 return true;
 442             }
 443         /* remove value */
 444         lua_pop(L, 1);
 445     }
 446     return false;
 447 }
 448
 449 /** Browse a table pushed on top of the index, and put all its table and
 450  * sub-table into an array.
 451  * \param L The Lua VM state.
 452  * \param elems The elements array.
 453  * \return False if we encounter an elements already in list.
 454  */
 455 static bool
 456 luaA_isloop_check(lua_State *L, cptr_array_t *elems)
 457 {
 458     if(lua_istable(L, -1))
 459     {
 460         const void *object = lua_topointer(L, -1);
 461
 462         /* Check that the object table is not already in the list */
 463         for(int i = 0; i < elems->len; i++)
 464             if(elems->tab[i] == object)
 465                 return false;
 466
 467         /* push the table in the elements list */
 468         cptr_array_append(elems, object);
 469
 470         /* look every object in the "table" */
 471         lua_pushnil(L);
 472         while(luaA_next(L, -2))
 473         {
 474             if(!luaA_isloop_check(L, elems))
 475             {
 476                 /* remove key and value */
 477                 lua_pop(L, 2);
 478                 return false;
 479             }
 480             /* remove value, keep key for next iteration */
 481             lua_pop(L, 1);
 482         }
 483     }
 484     return true;
 485 }
 486
 487 /** Check if a table is a loop. When using tables as direct acyclic digram,
 488  * this is useful.
 489  * \param L The Lua VM state.
 490  * \param idx The index of the table in the stack
 491  * \return True if the table loops.
 492  */
 493 bool
 494 luaA_isloop(lua_State *L, int idx)
 495 {
 496     /* elems is an elements array that we will fill with all array we
 497      * encounter while browsing the tables */
 498     cptr_array_t elems;
 499
 500     cptr_array_init(&elems);
 501
 502     /* push table on top */
 503     lua_pushvalue(L, idx);
 504
 505     bool ret = luaA_isloop_check(L, &elems);
 506
 507     /* remove pushed table */
 508     lua_pop(L, 1);
 509
 510     cptr_array_wipe(&elems);
 511
 512     return !ret;
 513 }
 514
 515 /** awesome global table.
 516  * \param L The Lua VM state.
 517  * \return The number of elements pushed on stack.
 518  * \luastack
 519  * \lfield font The default font.
 520  * \lfield font_height The default font height.
 521  * \lfield conffile The configuration file which has been loaded.
 522  */
 523 static int
 524 luaA_awesome_index(lua_State *L)
 525 {
 526     if(luaA_usemetatable(L, 1, 2))
 527         return 1;
 528
 529     size_t len;
 530     const char *buf = luaL_checklstring(L, 2, &len);
 531
 532     switch(a_tokenize(buf, len))
 533     {
 534       case A_TK_FONT:
 535         {
 536             char *font = pango_font_description_to_string(globalconf.font->desc);
 537             lua_pushstring(L, font);
 538             g_free(font);
 539         }
 540         break;
 541       case A_TK_FONT_HEIGHT:
 542         lua_pushnumber(L, globalconf.font->height);
 543         break;
 544       case A_TK_CONFFILE:
 545         lua_pushstring(L, globalconf.conffile);
 546         break;
 547       case A_TK_FG:
 548         luaA_pushxcolor(L, globalconf.colors.fg);
 549         break;
 550       case A_TK_BG:
 551         luaA_pushxcolor(L, globalconf.colors.bg);
 552         break;
 553       case A_TK_VERSION:
 554         lua_pushliteral(L, AWESOME_VERSION);
 555         break;
 556       case A_TK_RELEASE:
 557         lua_pushliteral(L, AWESOME_RELEASE);
 558         break;
 559       default:
 560         return 0;
 561     }
 562
 563     return 1;
 564 }
 565
 566 /** Newindex function for the awesome global table.
 567  * \param L The Lua VM state.
 568  * \return The number of elements pushed on stack.
 569  */
 570 static int
 571 luaA_awesome_newindex(lua_State *L)
 572 {
 573     if(luaA_usemetatable(L, 1, 2))
 574         return 1;
 575
 576     size_t len;
 577     const char *buf = luaL_checklstring(L, 2, &len);
 578
 579     switch(a_tokenize(buf, len))
 580     {
 581       case A_TK_FONT:
 582         {
 583             const char *newfont = luaL_checkstring(L, 3);
 584             draw_font_delete(&globalconf.font);
 585             globalconf.font = draw_font_new(newfont);
 586             /* refresh all wiboxes */
 587             foreach(wibox, globalconf.wiboxes)
 588                 (*wibox)->need_update = true;
 589             foreach(c, globalconf.clients)
 590                 if((*c)->titlebar)
 591                     (*c)->titlebar->need_update = true;
 592         }
 593         break;
 594       case A_TK_FG:
 595         if((buf = luaL_checklstring(L, 3, &len)))
 596            xcolor_init_reply(xcolor_init_unchecked(&globalconf.colors.fg, buf, len));
 597         break;
 598       case A_TK_BG:
 599         if((buf = luaL_checklstring(L, 3, &len)))
 600            xcolor_init_reply(xcolor_init_unchecked(&globalconf.colors.bg, buf, len));
 601         break;
 602       default:
 603         return 0;
 604     }
 605
 606     return 0;
 607 }
 608
 609 /** Add a global signal.
 610  * \param L The Lua VM state.
 611  * \return The number of elements pushed on stack.
 612  * \luastack
 613  * \lparam A string with the event name.
 614  * \lparam The function to call.
 615  */
 616 static int
 617 luaA_awesome_add_signal(lua_State *L)
 618 {
 619     const char *name = luaL_checkstring(L, 1);
 620     luaA_checkfunction(L, 2);
 621     signal_add(&global_signals, name, luaA_object_ref(L, 2));
 622     return 0;
 623 }
 624
 625 /** Remove a global signal.
 626  * \param L The Lua VM state.
 627  * \return The number of elements pushed on stack.
 628  * \luastack
 629  * \lparam A string with the event name.
 630  * \lparam The function to call.
 631  */
 632 static int
 633 luaA_awesome_remove_signal(lua_State *L)
 634 {
 635     const char *name = luaL_checkstring(L, 1);
 636     luaA_checkfunction(L, 2);
 637     const void *func = lua_topointer(L, 2);
 638     signal_remove(&global_signals, name, func);
 639     luaA_object_unref(L, (void *) func);
 640     return 0;
 641 }
 642
 643 /** Emit a global signal.
 644  * \param L The Lua VM state.
 645  * \return The number of elements pushed on stack.
 646  * \luastack
 647  * \lparam A string with the event name.
 648  * \lparam The function to call.
 649  */
 650 static int
 651 luaA_awesome_emit_signal(lua_State *L)
 652 {
 653     signal_object_emit(L, &global_signals, luaL_checkstring(L, 1), lua_gettop(L) - 1);
 654     return 0;
 655 }
 656
 657 /** Initialize the Lua VM
 658  * \param xdg An xdg handle to use to get XDG basedir.
 659  */
 660 void
 661 luaA_init(xdgHandle* xdg)
 662 {
 663     lua_State *L;
 664     static const struct luaL_reg awesome_lib[] =
 665     {
 666         { "quit", luaA_quit },
 667         { "exec", luaA_exec },
 668         { "spawn", luaA_spawn },
 669         { "restart", luaA_restart },
 670         { "add_signal", luaA_awesome_add_signal },
 671         { "remove_signal", luaA_awesome_remove_signal },
 672         { "emit_signal", luaA_awesome_emit_signal },
 673         { "__index", luaA_awesome_index },
 674         { "__newindex", luaA_awesome_newindex },
 675         { NULL, NULL }
 676     };
 677
 678     L = globalconf.L = luaL_newstate();
 679
 680     luaL_openlibs(L);
 681
 682     luaA_fixups(L);
 683
 684     luaA_object_setup(L);
 685
 686     /* Export awesome lib */
 687     luaA_openlib(L, "awesome", awesome_lib, awesome_lib);
 688
 689     /* Export root lib */
 690     luaL_register(L, "root", awesome_root_lib);
 691     lua_pop(L, 1); /* luaL_register() leaves the table on stack */
 692
 693     /* Export hooks lib */
 694     luaL_register(L, "hooks", awesome_hooks_lib);
 695     lua_pop(L, 1); /* luaL_register() leaves the table on stack */
 696
 697 #ifdef WITH_DBUS
 698     /* Export D-Bus lib */
 699     luaL_register(L, "dbus", awesome_dbus_lib);
 700     lua_pop(L, 1); /* luaL_register() leaves the table on stack */
 701 #endif
 702
 703     /* Export keygrabber lib */
 704     luaL_register(L, "keygrabber", awesome_keygrabber_lib);
 705     lua_pop(L, 1); /* luaL_register() leaves the table on stack */
 706
 707     /* Export mousegrabber lib */
 708     luaL_register(L, "mousegrabber", awesome_mousegrabber_lib);
 709     lua_pop(L, 1); /* luaL_register() leaves the table on stack */
 710
 711     /* Export screen */
 712     luaA_openlib(L, "screen", awesome_screen_methods, awesome_screen_meta);
 713
 714     /* Export mouse */
 715     luaA_openlib(L, "mouse", awesome_mouse_methods, awesome_mouse_meta);
 716
 717     /* Export button */
 718     button_class_setup(L);
 719
 720     /* Export image */
 721     image_class_setup(L);
 722
 723     /* Export tag */
 724     tag_class_setup(L);
 725
 726     /* Export wibox */
 727     wibox_class_setup(L);
 728
 729     /* Export widget */
 730     widget_class_setup(L);
 731
 732     /* Export client */
 733     client_class_setup(L);
 734
 735     /* Export keys */
 736     key_class_setup(L);
 737
 738     /* Export timer */
 739     timer_class_setup(L);
 740
 741     /* init hooks */
 742     globalconf.hooks.manage = LUA_REFNIL;
 743     globalconf.hooks.unmanage = LUA_REFNIL;
 744     globalconf.hooks.focus = LUA_REFNIL;
 745     globalconf.hooks.unfocus = LUA_REFNIL;
 746     globalconf.hooks.mouse_enter = LUA_REFNIL;
 747     globalconf.hooks.mouse_leave = LUA_REFNIL;
 748     globalconf.hooks.clients = LUA_REFNIL;
 749     globalconf.hooks.tags = LUA_REFNIL;
 750     globalconf.hooks.tagged = LUA_REFNIL;
 751     globalconf.hooks.property = LUA_REFNIL;
 752     globalconf.hooks.timer = LUA_REFNIL;
 753     globalconf.hooks.exit = LUA_REFNIL;
 754
 755     /* add Lua lib path (/usr/share/awesome/lib by default) */
 756     lua_getglobal(L, "package");
 757     if (LUA_TTABLE != lua_type(L, 1))
 758     {
 759         warn("package is not a table");
 760         return;
 761     }
 762     lua_getfield(L, 1, "path");
 763     if (LUA_TSTRING != lua_type(L, 2))
 764     {
 765         warn("package.path is not a string");
 766         lua_pop(L, 1);
 767         return;
 768     }
 769     lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?.lua");
 770     lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?/init.lua");
 771     lua_concat(L, 3); /* concatenate with package.path */
 772
 773     /* add XDG_CONFIG_DIR as include path */
 774     const char * const *xdgconfigdirs = xdgSearchableConfigDirectories(xdg);
 775     for(; *xdgconfigdirs; xdgconfigdirs++)
 776     {
 777         size_t len = a_strlen(*xdgconfigdirs);
 778         lua_pushliteral(L, ";");
 779         lua_pushlstring(L, *xdgconfigdirs, len);
 780         lua_pushliteral(L, "/awesome/?.lua");
 781         lua_concat(L, 3);
 782
 783         lua_pushliteral(L, ";");
 784         lua_pushlstring(L, *xdgconfigdirs, len);
 785         lua_pushliteral(L, "/awesome/?/init.lua");
 786         lua_concat(L, 3);
 787
 788         lua_concat(L, 3); /* concatenate with package.path */
 789     }
 790     lua_setfield(L, 1, "path"); /* package.path = "concatenated string" */
 791 }
 792
 793 static bool
 794 luaA_loadrc(const char *confpath, bool run)
 795 {
 796     if(!luaL_loadfile(globalconf.L, confpath))
 797     {
 798         if(run)
 799         {
 800             if(lua_pcall(globalconf.L, 0, LUA_MULTRET, 0))
 801                 fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
 802             else
 803             {
 804                 globalconf.conffile = a_strdup(confpath);
 805                 return true;
 806             }
 807         }
 808         else
 809             lua_pop(globalconf.L, 1);
 810         return true;
 811     }
 812     else
 813         fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
 814
 815     return false;
 816 }
 817
 818 /** Load a configuration file.
 819  * \param xdg An xdg handle to use to get XDG basedir.
 820  * \param confpatharg The configuration file to load.
 821  * \param run Run the configuration file.
 822  */
 823 bool
 824 luaA_parserc(xdgHandle* xdg, const char *confpatharg, bool run)
 825 {
 826     char *confpath = NULL;
 827     bool ret = false;
 828
 829     /* try to load, return if it's ok */
 830     if(confpatharg)
 831     {
 832         if(luaA_loadrc(confpatharg, run))
 833         {
 834             ret = true;
 835             goto bailout;
 836         }
 837         else if(!run)
 838             goto bailout;
 839     }
 840
 841     confpath = xdgConfigFind("awesome/rc.lua", xdg);
 842
 843     char *tmp = confpath;
 844
 845     /* confpath is "string1\0string2\0string3\0\0" */
 846     while(*tmp)
 847     {
 848         if(luaA_loadrc(tmp, run))
 849         {
 850             ret = true;
 851             goto bailout;
 852         }
 853         else if(!run)
 854             goto bailout;
 855         tmp += a_strlen(tmp) + 1;
 856     }
 857
 858 bailout:
 859
 860     p_delete(&confpath);
 861
 862     return ret;
 863 }
 864
 865 void
 866 luaA_on_timer(EV_P_ ev_timer *w, int revents)
 867 {
 868     if(globalconf.hooks.timer != LUA_REFNIL)
 869         luaA_dofunction_from_registry(globalconf.L, globalconf.hooks.timer, 0, 0);
 870 }
 871
 872 int
 873 luaA_class_index_miss_property(lua_State *L, lua_object_t *obj)
 874 {
 875     signal_object_emit(L, &global_signals, "debug::index::miss", 2);
 876     return 0;
 877 }
 878
 879 int
 880 luaA_class_newindex_miss_property(lua_State *L, lua_object_t *obj)
 881 {
 882     signal_object_emit(L, &global_signals, "debug::newindex::miss", 3);
 883     return 0;
 884 }
 885
 886 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80