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 <lua.h>
  25 #include <lauxlib.h>
  26 #include <lualib.h>
  27
  28 #include <basedir_fs.h>
  29
  30 #include <xcb/xcb_atom.h>
  31
  32 #include "awesome.h"
  33 #include "config.h"
  34 #include "objects/timer.h"
  35 #include "awesome-version-internal.h"
  36 #include "ewmh.h"
  37 #include "luaa.h"
  38 #include "spawn.h"
  39 #include "objects/tag.h"
  40 #include "objects/client.h"
  41 #include "objects/drawin.h"
  42 #include "objects/drawable.h"
  43 #include "screen.h"
  44 #include "event.h"
  45 #include "property.h"
  46 #include "selection.h"
  47 #include "systray.h"
  48 #include "common/xcursor.h"
  49 #include "common/buffer.h"
  50 #include "common/backtrace.h"
  51
  52 #ifdef WITH_DBUS
  53 extern const struct luaL_Reg awesome_dbus_lib[];
  54 #endif
  55 extern const struct luaL_Reg awesome_keygrabber_lib[];
  56 extern const struct luaL_Reg awesome_mousegrabber_lib[];
  57 extern const struct luaL_Reg awesome_root_lib[];
  58 extern const struct luaL_Reg awesome_mouse_methods[];
  59 extern const struct luaL_Reg awesome_mouse_meta[];
  60 extern const struct luaL_Reg awesome_screen_methods[];
  61 extern const struct luaL_Reg awesome_screen_meta[];
  62
  63 /** Path to config file */
  64 static char *conffile;
  65
  66 /** Check whether a composite manager is running.
  67  * \return True if such a manager is running.
  68  */
  69 static bool
  70 composite_manager_running(void)
  71 {
  72     xcb_intern_atom_reply_t *atom_r;
  73     xcb_get_selection_owner_reply_t *selection_r;
  74     char *atom_name;
  75     bool result;
  76
  77     if(!(atom_name = xcb_atom_name_by_screen("_NET_WM_CM", globalconf.default_screen)))
  78     {
  79         warn("error getting composite manager atom");
  80         return false;
  81     }
  82
  83     atom_r = xcb_intern_atom_reply(globalconf.connection,
  84                                    xcb_intern_atom_unchecked(globalconf.connection, false,
  85                                                              a_strlen(atom_name), atom_name),
  86                                    NULL);
  87     p_delete(&atom_name);
  88     if(!atom_r)
  89         return false;
  90
  91     selection_r = xcb_get_selection_owner_reply(globalconf.connection,
  92                                                 xcb_get_selection_owner_unchecked(globalconf.connection,
  93                                                                                   atom_r->atom),
  94                                                 NULL);
  95     p_delete(&atom_r);
  96
  97     result = selection_r != NULL && selection_r->owner != XCB_NONE;
  98     p_delete(&selection_r);
  99
 100     return result;
 101 }
 102
 103 /** Quit awesome.
 104  * \param L The Lua VM state.
 105  * \return The number of elements pushed on stack.
 106  */
 107 static int
 108 luaA_quit(lua_State *L)
 109 {
 110     g_main_loop_quit(globalconf.loop);
 111     return 0;
 112 }
 113
 114 /** Execute another application, probably a window manager, to replace
 115  * awesome.
 116  * \param L The Lua VM state.
 117  * \return The number of elements pushed on stack.
 118  * \luastack
 119  * \lparam The command line to execute.
 120  */
 121 static int
 122 luaA_exec(lua_State *L)
 123 {
 124     const char *cmd = luaL_checkstring(L, 1);
 125
 126     awesome_atexit(false);
 127
 128     a_exec(cmd);
 129     return 0;
 130 }
 131
 132 /** Restart awesome.
 133  */
 134 static int
 135 luaA_restart(lua_State *L)
 136 {
 137     awesome_restart();
 138     return 0;
 139 }
 140
 141 /** Load an image from a given path.
 142  * \param L The Lua VM state.
 143  * \return The number of elements pushed on stack.
 144  * \luastack
 145  * \lparam The command line to execute.
 146  */
 147 static int
 148 luaA_load_image(lua_State *L)
 149 {
 150     const char *filename = luaL_checkstring(L, 1);
 151     cairo_surface_t *surface = draw_load_image(L, filename);
 152     if (!surface)
 153         return 0;
 154     /* lua has to make sure to free the ref or we have a leak */
 155     lua_pushlightuserdata(L, surface);
 156     return 1;
 157 }
 158
 159 /** UTF-8 aware string length computing.
 160  * \param L The Lua VM state.
 161  * \return The number of elements pushed on stack.
 162  */
 163 static int
 164 luaA_mbstrlen(lua_State *L)
 165 {
 166     const char *cmd = luaL_checkstring(L, 1);
 167     lua_pushnumber(L, (ssize_t) mbstowcs(NULL, NONULL(cmd), 0));
 168     return 1;
 169 }
 170
 171 /** Overload standard Lua next function to use __next key on metatable.
 172  * \param L The Lua VM state.
 173  * \return The number of elements pushed on stack.
 174  */
 175 static int
 176 luaAe_next(lua_State *L)
 177 {
 178     if(luaL_getmetafield(L, 1, "__next"))
 179     {
 180         lua_insert(L, 1);
 181         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 182         return lua_gettop(L);
 183     }
 184
 185     luaL_checktype(L, 1, LUA_TTABLE);
 186     lua_settop(L, 2);
 187     if(lua_next(L, 1))
 188         return 2;
 189     lua_pushnil(L);
 190     return 1;
 191 }
 192
 193 /** Overload lua_next() function by using __next metatable field
 194  * to get next elements.
 195  * \param L The Lua VM stack.
 196  * \param idx The index number of elements in stack.
 197  * \return 1 if more elements to come, 0 otherwise.
 198  */
 199 static int
 200 luaA_next(lua_State *L, int idx)
 201 {
 202     if(luaL_getmetafield(L, idx, "__next"))
 203     {
 204         /* if idx is relative, reduce it since we got __next */
 205         if(idx < 0) idx--;
 206         /* copy table and then move key */
 207         lua_pushvalue(L, idx);
 208         lua_pushvalue(L, -3);
 209         lua_remove(L, -4);
 210         lua_pcall(L, 2, 2, 0);
 211         /* next returned nil, it's the end */
 212         if(lua_isnil(L, -1))
 213         {
 214             /* remove nil */
 215             lua_pop(L, 2);
 216             return 0;
 217         }
 218         return 1;
 219     }
 220     else if(lua_istable(L, idx))
 221         return lua_next(L, idx);
 222     /* remove the key */
 223     lua_pop(L, 1);
 224     return 0;
 225 }
 226
 227 /** Generic pairs function.
 228  * \param L The Lua VM state.
 229  * \return The number of elements pushed on stack.
 230  */
 231 static int
 232 luaA_generic_pairs(lua_State *L)
 233 {
 234     lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
 235     lua_pushvalue(L, 1);  /* state, */
 236     lua_pushnil(L);  /* and initial value */
 237     return 3;
 238 }
 239
 240 /** Overload standard pairs function to use __pairs field of metatables.
 241  * \param L The Lua VM state.
 242  * \return The number of elements pushed on stack.
 243  */
 244 static int
 245 luaAe_pairs(lua_State *L)
 246 {
 247     if(luaL_getmetafield(L, 1, "__pairs"))
 248     {
 249         lua_insert(L, 1);
 250         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 251         return lua_gettop(L);
 252     }
 253
 254     luaL_checktype(L, 1, LUA_TTABLE);
 255     return luaA_generic_pairs(L);
 256 }
 257
 258 static int
 259 luaA_ipairs_aux(lua_State *L)
 260 {
 261     int i = luaL_checkint(L, 2) + 1;
 262     luaL_checktype(L, 1, LUA_TTABLE);
 263     lua_pushinteger(L, i);
 264     lua_rawgeti(L, 1, i);
 265     return (lua_isnil(L, -1)) ? 0 : 2;
 266 }
 267
 268 /** Overload standard ipairs function to use __ipairs field of metatables.
 269  * \param L The Lua VM state.
 270  * \return The number of elements pushed on stack.
 271  */
 272 static int
 273 luaAe_ipairs(lua_State *L)
 274 {
 275     if(luaL_getmetafield(L, 1, "__ipairs"))
 276     {
 277         lua_insert(L, 1);
 278         lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
 279         return lua_gettop(L);
 280     }
 281
 282     luaL_checktype(L, 1, LUA_TTABLE);
 283     lua_pushvalue(L, lua_upvalueindex(1));
 284     lua_pushvalue(L, 1);
 285     lua_pushinteger(L, 0);  /* and initial value */
 286     return 3;
 287 }
 288
 289 /** Enhanced type() function which recognize awesome objects.
 290  * \param L The Lua VM state.
 291  * \return The number of arguments pushed on the stack.
 292  */
 293 static int
 294 luaAe_type(lua_State *L)
 295 {
 296     luaL_checkany(L, 1);
 297     lua_pushstring(L, luaA_typename(L, 1));
 298     return 1;
 299 }
 300
 301 /** Replace various standards Lua functions with our own.
 302  * \param L The Lua VM state.
 303  */
 304 static void
 305 luaA_fixups(lua_State *L)
 306 {
 307     /* export string.wlen */
 308     lua_getglobal(L, "string");
 309     lua_pushcfunction(L, luaA_mbstrlen);
 310     lua_setfield(L, -2, "wlen");
 311     lua_pop(L, 1);
 312     /* replace next */
 313     lua_pushcfunction(L, luaAe_next);
 314     lua_setglobal(L, "next");
 315     /* replace pairs */
 316     lua_pushcfunction(L, luaAe_next);
 317     lua_pushcclosure(L, luaAe_pairs, 1); /* pairs get next as upvalue */
 318     lua_setglobal(L, "pairs");
 319     /* replace ipairs */
 320     lua_pushcfunction(L, luaA_ipairs_aux);
 321     lua_pushcclosure(L, luaAe_ipairs, 1);
 322     lua_setglobal(L, "ipairs");
 323     /* replace type */
 324     lua_pushcfunction(L, luaAe_type);
 325     lua_setglobal(L, "type");
 326     /* set selection */
 327     lua_pushcfunction(L, luaA_selection_get);
 328     lua_setglobal(L, "selection");
 329 }
 330
 331 /** Look for an item: table, function, etc.
 332  * \param L The Lua VM state.
 333  * \param item The pointer item.
 334  */
 335 bool
 336 luaA_hasitem(lua_State *L, const void *item)
 337 {
 338     lua_pushnil(L);
 339     while(luaA_next(L, -2))
 340     {
 341         if(lua_topointer(L, -1) == item)
 342         {
 343             /* remove value and key */
 344             lua_pop(L, 2);
 345             return true;
 346         }
 347         if(lua_istable(L, -1))
 348             if(luaA_hasitem(L, item))
 349             {
 350                 /* remove key and value */
 351                 lua_pop(L, 2);
 352                 return true;
 353             }
 354         /* remove value */
 355         lua_pop(L, 1);
 356     }
 357     return false;
 358 }
 359
 360 /** Browse a table pushed on top of the index, and put all its table and
 361  * sub-table into an array.
 362  * \param L The Lua VM state.
 363  * \param elems The elements array.
 364  * \return False if we encounter an elements already in list.
 365  */
 366 static bool
 367 luaA_isloop_check(lua_State *L, cptr_array_t *elems)
 368 {
 369     if(lua_istable(L, -1))
 370     {
 371         const void *object = lua_topointer(L, -1);
 372
 373         /* Check that the object table is not already in the list */
 374         for(int i = 0; i < elems->len; i++)
 375             if(elems->tab[i] == object)
 376                 return false;
 377
 378         /* push the table in the elements list */
 379         cptr_array_append(elems, object);
 380
 381         /* look every object in the "table" */
 382         lua_pushnil(L);
 383         while(luaA_next(L, -2))
 384         {
 385             if(!luaA_isloop_check(L, elems))
 386             {
 387                 /* remove key and value */
 388                 lua_pop(L, 2);
 389                 return false;
 390             }
 391             /* remove value, keep key for next iteration */
 392             lua_pop(L, 1);
 393         }
 394     }
 395     return true;
 396 }
 397
 398 /** Check if a table is a loop. When using tables as direct acyclic digram,
 399  * this is useful.
 400  * \param L The Lua VM state.
 401  * \param idx The index of the table in the stack
 402  * \return True if the table loops.
 403  */
 404 bool
 405 luaA_isloop(lua_State *L, int idx)
 406 {
 407     /* elems is an elements array that we will fill with all array we
 408      * encounter while browsing the tables */
 409     cptr_array_t elems;
 410
 411     cptr_array_init(&elems);
 412
 413     /* push table on top */
 414     lua_pushvalue(L, idx);
 415
 416     bool ret = luaA_isloop_check(L, &elems);
 417
 418     /* remove pushed table */
 419     lua_pop(L, 1);
 420
 421     cptr_array_wipe(&elems);
 422
 423     return !ret;
 424 }
 425
 426 /** awesome global table.
 427  * \param L The Lua VM state.
 428  * \return The number of elements pushed on stack.
 429  * \luastack
 430  * \lfield conffile The configuration file which has been loaded.
 431  * \lfield version The version of awesome.
 432  * \lfield release The release name of awesome.
 433  * \lfield startup_errors Error message for errors that occured during startup.
 434  * \lfield composite_manager_running True if a composite manager is running.
 435  */
 436 static int
 437 luaA_awesome_index(lua_State *L)
 438 {
 439     if(luaA_usemetatable(L, 1, 2))
 440         return 1;
 441
 442     const char *buf = luaL_checkstring(L, 2);
 443
 444     if(A_STREQ(buf, "conffile"))
 445     {
 446         lua_pushstring(L, conffile);
 447         return 1;
 448     }
 449
 450     if(A_STREQ(buf, "version"))
 451     {
 452         lua_pushliteral(L, AWESOME_VERSION);
 453         return 1;
 454     }
 455
 456     if(A_STREQ(buf, "release"))
 457     {
 458         lua_pushliteral(L, AWESOME_RELEASE);
 459         return 1;
 460     }
 461
 462     if(A_STREQ(buf, "startup_errors") && globalconf.startup_errors.len != 0)
 463     {
 464         lua_pushstring(L, globalconf.startup_errors.s);
 465         return 1;
 466     }
 467
 468     if(A_STREQ(buf, "composite_manager_running"))
 469     {
 470         lua_pushboolean(L, composite_manager_running());
 471         return 1;
 472     }
 473
 474     return 0;
 475 }
 476
 477 /** Add a global signal.
 478  * \param L The Lua VM state.
 479  * \return The number of elements pushed on stack.
 480  * \luastack
 481  * \lparam A string with the event name.
 482  * \lparam The function to call.
 483  */
 484 static int
 485 luaA_awesome_connect_signal(lua_State *L)
 486 {
 487     const char *name = luaL_checkstring(L, 1);
 488     luaA_checkfunction(L, 2);
 489     signal_connect(&global_signals, name, luaA_object_ref(L, 2));
 490     return 0;
 491 }
 492
 493 /** Remove a global signal.
 494  * \param L The Lua VM state.
 495  * \return The number of elements pushed on stack.
 496  * \luastack
 497  * \lparam A string with the event name.
 498  * \lparam The function to call.
 499  */
 500 static int
 501 luaA_awesome_disconnect_signal(lua_State *L)
 502 {
 503     const char *name = luaL_checkstring(L, 1);
 504     luaA_checkfunction(L, 2);
 505     const void *func = lua_topointer(L, 2);
 506     signal_disconnect(&global_signals, name, func);
 507     luaA_object_unref(L, (void *) func);
 508     return 0;
 509 }
 510
 511 /** Emit a global signal.
 512  * \param L The Lua VM state.
 513  * \return The number of elements pushed on stack.
 514  * \luastack
 515  * \lparam A string with the event name.
 516  * \lparam The function to call.
 517  */
 518 static int
 519 luaA_awesome_emit_signal(lua_State *L)
 520 {
 521     signal_object_emit(L, &global_signals, luaL_checkstring(L, 1), lua_gettop(L) - 1);
 522     return 0;
 523 }
 524
 525 static int
 526 luaA_panic(lua_State *L)
 527 {
 528     warn("unprotected error in call to Lua API (%s)",
 529          lua_tostring(L, -1));
 530     buffer_t buf;
 531     backtrace_get(&buf);
 532     warn("dumping backtrace\n%s", buf.s);
 533     warn("restarting awesome");
 534     awesome_restart();
 535     return 0;
 536 }
 537
 538 static int
 539 luaA_dofunction_on_error(lua_State *L)
 540 {
 541     /* duplicate string error */
 542     lua_pushvalue(L, -1);
 543     /* emit error signal */
 544     signal_object_emit(L, &global_signals, "debug::error", 1);
 545
 546     if(!luaL_dostring(L, "return debug.traceback(\"error while running function\", 3)"))
 547     {
 548         /* Move traceback before error */
 549         lua_insert(L, -2);
 550         /* Insert sentence */
 551         lua_pushliteral(L, "\nerror: ");
 552         /* Move it before error */
 553         lua_insert(L, -2);
 554         lua_concat(L, 3);
 555     }
 556     return 1;
 557 }
 558
 559 /** Initialize the Lua VM
 560  * \param xdg An xdg handle to use to get XDG basedir.
 561  */
 562 void
 563 luaA_init(xdgHandle* xdg)
 564 {
 565     lua_State *L;
 566     static const struct luaL_Reg awesome_lib[] =
 567     {
 568         { "quit", luaA_quit },
 569         { "exec", luaA_exec },
 570         { "spawn", luaA_spawn },
 571         { "restart", luaA_restart },
 572         { "connect_signal", luaA_awesome_connect_signal },
 573         { "disconnect_signal", luaA_awesome_disconnect_signal },
 574         { "emit_signal", luaA_awesome_emit_signal },
 575         { "systray", luaA_systray },
 576         { "load_image", luaA_load_image },
 577         { "register_xproperty", luaA_register_xproperty },
 578         { "__index", luaA_awesome_index },
 579         { NULL, NULL }
 580     };
 581
 582     L = globalconf.L = luaL_newstate();
 583
 584     /* Set panic function */
 585     lua_atpanic(L, luaA_panic);
 586
 587     /* Set error handling function */
 588     lualib_dofunction_on_error = luaA_dofunction_on_error;
 589
 590     luaL_openlibs(L);
 591
 592     luaA_fixups(L);
 593
 594     luaA_object_setup(L);
 595
 596     /* Export awesome lib */
 597     luaA_openlib(L, "awesome", awesome_lib, awesome_lib);
 598
 599     /* Export root lib */
 600     luaA_registerlib(L, "root", awesome_root_lib);
 601     lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */
 602
 603 #ifdef WITH_DBUS
 604     /* Export D-Bus lib */
 605     luaA_registerlib(L, "dbus", awesome_dbus_lib);
 606     lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */
 607 #endif
 608
 609     /* Export keygrabber lib */
 610     luaA_registerlib(L, "keygrabber", awesome_keygrabber_lib);
 611     lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */
 612
 613     /* Export mousegrabber lib */
 614     luaA_registerlib(L, "mousegrabber", awesome_mousegrabber_lib);
 615     lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */
 616
 617     /* Export screen */
 618     luaA_openlib(L, "screen", awesome_screen_methods, awesome_screen_meta);
 619
 620     /* Export mouse */
 621     luaA_openlib(L, "mouse", awesome_mouse_methods, awesome_mouse_meta);
 622
 623     /* Export button */
 624     button_class_setup(L);
 625
 626     /* Export tag */
 627     tag_class_setup(L);
 628
 629     /* Export window */
 630     window_class_setup(L);
 631
 632     /* Export drawable */
 633     drawable_class_setup(L);
 634
 635     /* Export drawin */
 636     drawin_class_setup(L);
 637
 638     /* Export client */
 639     client_class_setup(L);
 640
 641     /* Export keys */
 642     key_class_setup(L);
 643
 644     /* Export timer */
 645     timer_class_setup(L);
 646
 647     /* add Lua search paths */
 648     lua_getglobal(L, "package");
 649     if (LUA_TTABLE != lua_type(L, 1))
 650     {
 651         warn("package is not a table");
 652         return;
 653     }
 654     lua_getfield(L, 1, "path");
 655     if (LUA_TSTRING != lua_type(L, 2))
 656     {
 657         warn("package.path is not a string");
 658         lua_pop(L, 1);
 659         return;
 660     }
 661
 662     /* add XDG_CONFIG_DIR as include path */
 663     const char * const *xdgconfigdirs = xdgSearchableConfigDirectories(xdg);
 664     for(; *xdgconfigdirs; xdgconfigdirs++)
 665     {
 666         size_t len = a_strlen(*xdgconfigdirs);
 667         lua_pushliteral(L, ";");
 668         lua_pushlstring(L, *xdgconfigdirs, len);
 669         lua_pushliteral(L, "/awesome/?.lua");
 670         lua_concat(L, 3);
 671
 672         lua_pushliteral(L, ";");
 673         lua_pushlstring(L, *xdgconfigdirs, len);
 674         lua_pushliteral(L, "/awesome/?/init.lua");
 675         lua_concat(L, 3);
 676
 677         lua_concat(L, 3); /* concatenate with package.path */
 678     }
 679
 680     /* add Lua lib path (/usr/share/awesome/lib by default) */
 681     lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?.lua");
 682     lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?/init.lua");
 683     lua_concat(L, 3); /* concatenate with package.path */
 684     lua_setfield(L, 1, "path"); /* package.path = "concatenated string" */
 685
 686     lua_getfield(L, 1, "loaded");
 687
 688     lua_pop(L, 2); /* pop "package" and "package.loaded" */
 689
 690     signal_add(&global_signals, "debug::error");
 691     signal_add(&global_signals, "debug::deprecation");
 692     signal_add(&global_signals, "debug::index::miss");
 693     signal_add(&global_signals, "debug::newindex::miss");
 694     signal_add(&global_signals, "systray::update");
 695     signal_add(&global_signals, "wallpaper_changed");
 696     signal_add(&global_signals, "refresh");
 697     signal_add(&global_signals, "exit");
 698 }
 699
 700 static void
 701 luaA_startup_error(const char *err)
 702 {
 703     if (globalconf.startup_errors.len > 0)
 704         buffer_addsl(&globalconf.startup_errors, "\n\n");
 705     buffer_adds(&globalconf.startup_errors, err);
 706 }
 707
 708 static bool
 709 luaA_loadrc(const char *confpath, bool run)
 710 {
 711     if(!luaL_loadfile(globalconf.L, confpath))
 712     {
 713         if(run)
 714         {
 715             /* Set the conffile right now so it can be used inside the
 716              * configuration file. */
 717             conffile = a_strdup(confpath);
 718             /* Move error handling function before function */
 719             lua_pushcfunction(globalconf.L, luaA_dofunction_on_error);
 720             lua_insert(globalconf.L, -2);
 721             if(lua_pcall(globalconf.L, 0, LUA_MULTRET, -2))
 722             {
 723                 const char *err = lua_tostring(globalconf.L, -1);
 724                 luaA_startup_error(err);
 725                 fprintf(stderr, "%s\n", err);
 726                 /* An error happened, so reset this. */
 727                 conffile = NULL;
 728             }
 729             else
 730                 return true;
 731         }
 732         else
 733         {
 734             lua_pop(globalconf.L, 1);
 735             return true;
 736         }
 737     }
 738     else
 739     {
 740         const char *err = lua_tostring(globalconf.L, -1);
 741         luaA_startup_error(err);
 742         fprintf(stderr, "%s\n", err);
 743     }
 744
 745     return false;
 746 }
 747
 748 /** Load a configuration file.
 749  * \param xdg An xdg handle to use to get XDG basedir.
 750  * \param confpatharg The configuration file to load.
 751  * \param run Run the configuration file.
 752  */
 753 bool
 754 luaA_parserc(xdgHandle* xdg, const char *confpatharg, bool run)
 755 {
 756     char *confpath = NULL;
 757     bool ret = false;
 758
 759     /* try to load, return if it's ok */
 760     if(confpatharg)
 761     {
 762         if(luaA_loadrc(confpatharg, run))
 763         {
 764             ret = true;
 765             goto bailout;
 766         }
 767         else if(!run)
 768             goto bailout;
 769     }
 770
 771     confpath = xdgConfigFind("awesome/rc.lua", xdg);
 772
 773     char *tmp = confpath;
 774
 775     /* confpath is "string1\0string2\0string3\0\0" */
 776     while(*tmp)
 777     {
 778         if(luaA_loadrc(tmp, run))
 779         {
 780             ret = true;
 781             goto bailout;
 782         }
 783         else if(!run)
 784             goto bailout;
 785         tmp += a_strlen(tmp) + 1;
 786     }
 787
 788 bailout:
 789
 790     p_delete(&confpath);
 791
 792     return ret;
 793 }
 794
 795 int
 796 luaA_class_index_miss_property(lua_State *L, lua_object_t *obj)
 797 {
 798     signal_object_emit(L, &global_signals, "debug::index::miss", 2);
 799     return 0;
 800 }
 801
 802 int
 803 luaA_class_newindex_miss_property(lua_State *L, lua_object_t *obj)
 804 {
 805     signal_object_emit(L, &global_signals, "debug::newindex::miss", 3);
 806     return 0;
 807 }
 808
 809 void
 810 luaA_emit_refresh()
 811 {
 812     signal_object_emit(globalconf.L, &global_signals, "refresh", 0);
 813 }
 814
 815 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80