/* * luaa.c - Lua configuration management * * Copyright © 2008-2009 Julien Danjou * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * */ /** awesome core API * * @author Julien Danjou <julien@danjou.info> * @copyright 2008-2009 Julien Danjou * @release @AWESOME_VERSION@ * @module awesome */ #define _GNU_SOURCE #include "luaa.h" #include "globalconf.h" #include "awesome.h" #include "common/backtrace.h" #include "common/version.h" #include "config.h" #include "event.h" #include "objects/client.h" #include "objects/drawable.h" #include "objects/drawin.h" #include "objects/screen.h" #include "objects/tag.h" #include "property.h" #include "selection.h" #include "spawn.h" #include "systray.h" #include "xkb.h" #include "xrdb.h" #include #include #include #include #include #include /* for gethostname() */ #ifdef WITH_DBUS extern const struct luaL_Reg awesome_dbus_lib[]; #endif extern const struct luaL_Reg awesome_keygrabber_lib[]; extern const struct luaL_Reg awesome_mousegrabber_lib[]; extern const struct luaL_Reg awesome_root_lib[]; extern const struct luaL_Reg awesome_mouse_methods[]; extern const struct luaL_Reg awesome_mouse_meta[]; /** A call into the lua code aborted with an error * @signal debug::error */ /** A deprecated lua function was called * @signal debug::deprecation */ /** An invalid key was read from an object (e.g. c.foo) * @signal debug::index::miss */ /** An invalid key was written to an object (e.g. c.foo = "bar") * @signal debug::newindex::miss */ /** * @signal systray::update */ /** * @signal wallpaper_changed */ /** * @signal xkb::map_changed */ /** * @signal xkb::group_changed */ /** * @signal refresh */ /** * @signal startup */ /** * @signal exit */ /** * @signal screen::change */ /** Path to config file */ static char *conffile; /** Check whether a composite manager is running. * \return True if such a manager is running. */ static bool composite_manager_running(void) { xcb_intern_atom_reply_t *atom_r; xcb_get_selection_owner_reply_t *selection_r; char *atom_name; bool result; if(!(atom_name = xcb_atom_name_by_screen("_NET_WM_CM", globalconf.default_screen))) { warn("error getting composite manager atom"); return false; } atom_r = xcb_intern_atom_reply(globalconf.connection, xcb_intern_atom_unchecked(globalconf.connection, false, a_strlen(atom_name), atom_name), NULL); p_delete(&atom_name); if(!atom_r) return false; selection_r = xcb_get_selection_owner_reply(globalconf.connection, xcb_get_selection_owner_unchecked(globalconf.connection, atom_r->atom), NULL); p_delete(&atom_r); result = selection_r != NULL && selection_r->owner != XCB_NONE; p_delete(&selection_r); return result; } /** Quit awesome. * @function quit */ static int luaA_quit(lua_State *L) { if (globalconf.loop == NULL) globalconf.loop = g_main_loop_new(NULL, FALSE); g_main_loop_quit(globalconf.loop); return 0; } /** Execute another application, probably a window manager, to replace * awesome. * * @param cmd The command line to execute. * @function exec */ static int luaA_exec(lua_State *L) { const char *cmd = luaL_checkstring(L, 1); awesome_atexit(false); a_exec(cmd); return 0; } /** Restart awesome. * @function restart */ static int luaA_restart(lua_State *L) { awesome_restart(); return 0; } /** Send a signal to a process identified by its process id. See * `awesome.unix_signal` for a list of signals. * @tparam integer pid Process identifier * @tparam integer sig Signal number * @treturn boolean true if the signal was successfully sent, else false * @function kill */ static int luaA_kill(lua_State *L) { int pid = luaA_checknumber_range(L, 1, 1, INT_MAX); int sig = luaA_checknumber_range(L, 2, 0, INT_MAX); int result = kill(pid, sig); lua_pushboolean(L, result == 0); return 1; } /** Load an image from a given path. * * @param name The file name. * @return[1] A cairo surface as light user datum. * @return[2] nil * @treturn[2] string Error message * @function load_image */ static int luaA_load_image(lua_State *L) { GError *error = NULL; const char *filename = luaL_checkstring(L, 1); cairo_surface_t *surface = draw_load_image(L, filename, &error); if (!surface) { lua_pushnil(L); lua_pushstring(L, error->message); g_error_free(error); return 2; } /* lua has to make sure to free the ref or we have a leak */ lua_pushlightuserdata(L, surface); return 1; } /** Set the preferred size for client icons. * * The closest equal or bigger size is picked if present, otherwise the closest * smaller size is picked. The default is 0 pixels, ie. the smallest icon. * * @param size The size of the icons in pixels. * @function set_preferred_icon_size */ static int luaA_set_preferred_icon_size(lua_State *L) { globalconf.preferred_icon_size = luaA_checkinteger_range(L, 1, 0, UINT32_MAX); return 0; } /** UTF-8 aware string length computing. * \param L The Lua VM state. * \return The number of elements pushed on stack. */ static int luaA_mbstrlen(lua_State *L) { const char *cmd = luaL_checkstring(L, 1); lua_pushinteger(L, (ssize_t) mbstowcs(NULL, NONULL(cmd), 0)); return 1; } /** Enhanced type() function which recognize awesome objects. * \param L The Lua VM state. * \return The number of arguments pushed on the stack. */ static int luaAe_type(lua_State *L) { luaL_checkany(L, 1); lua_pushstring(L, luaA_typename(L, 1)); return 1; } /** Replace various standards Lua functions with our own. * \param L The Lua VM state. */ static void luaA_fixups(lua_State *L) { /* export string.wlen */ lua_getglobal(L, "string"); lua_pushcfunction(L, luaA_mbstrlen); lua_setfield(L, -2, "wlen"); lua_pop(L, 1); /* replace type */ lua_pushcfunction(L, luaAe_type); lua_setglobal(L, "type"); /* set selection */ lua_pushcfunction(L, luaA_selection_get); lua_setglobal(L, "selection"); } /** awesome global table. * @field version The version of awesome. * @field release The release name of awesome. * @field conffile The configuration file which has been loaded. * @field startup True if we are still in startup, false otherwise. * @field startup_errors Error message for errors that occured during * startup. * @field composite_manager_running True if a composite manager is running. * @field unix_signal Table mapping between signal numbers and signal identifiers. * @field hostname The hostname of the computer on which we are running. * @table awesome */ static int luaA_awesome_index(lua_State *L) { if(luaA_usemetatable(L, 1, 2)) return 1; const char *buf = luaL_checkstring(L, 2); if(A_STREQ(buf, "conffile")) { lua_pushstring(L, conffile); return 1; } if(A_STREQ(buf, "version")) { lua_pushstring(L, awesome_version_string()); return 1; } if(A_STREQ(buf, "release")) { lua_pushstring(L, awesome_release_string()); return 1; } if(A_STREQ(buf, "startup")) { lua_pushboolean(L, globalconf.loop == NULL); return 1; } if(A_STREQ(buf, "startup_errors")) { if (globalconf.startup_errors.len == 0) return 0; lua_pushstring(L, globalconf.startup_errors.s); return 1; } if(A_STREQ(buf, "composite_manager_running")) { lua_pushboolean(L, composite_manager_running()); return 1; } if(A_STREQ(buf, "hostname")) { /* No good way to handle failures... */ char hostname[256] = ""; gethostname(&hostname[0], countof(hostname)); hostname[countof(hostname) - 1] = '\0'; lua_pushstring(L, hostname); return 1; } return luaA_default_index(L); } /** Add a global signal. * * @param name A string with the event name. * @param func The function to call. * @function connect_signal */ static int luaA_awesome_connect_signal(lua_State *L) { const char *name = luaL_checkstring(L, 1); luaA_checkfunction(L, 2); signal_connect(&global_signals, name, luaA_object_ref(L, 2)); return 0; } /** Remove a global signal. * * @param name A string with the event name. * @param func The function to call. * @function disconnect_signal */ static int luaA_awesome_disconnect_signal(lua_State *L) { const char *name = luaL_checkstring(L, 1); luaA_checkfunction(L, 2); const void *func = lua_topointer(L, 2); signal_disconnect(&global_signals, name, func); luaA_object_unref(L, (void *) func); return 0; } /** Emit a global signal. * * @param name A string with the event name. * @param ... The signal arguments. * @function emit_signal */ static int luaA_awesome_emit_signal(lua_State *L) { signal_object_emit(L, &global_signals, luaL_checkstring(L, 1), lua_gettop(L) - 1); return 0; } static int luaA_panic(lua_State *L) { warn("unprotected error in call to Lua API (%s)", lua_tostring(L, -1)); buffer_t buf; backtrace_get(&buf); warn("dumping backtrace\n%s", buf.s); warn("restarting awesome"); awesome_restart(); return 0; } #if LUA_VERSION_NUM >= 502 static const char * luaA_tolstring(lua_State *L, int idx, size_t *len) { return luaL_tolstring(L, idx, len); } #else static const char * luaA_tolstring(lua_State *L, int idx, size_t *len) { /* Try using the metatable. If that fails, push the value itself onto * the stack. */ if (!luaL_callmeta(L, idx, "__tostring")) lua_pushvalue(L, idx); switch (lua_type(L, -1)) { case LUA_TSTRING: lua_pushvalue(L, -1); break; case LUA_TBOOLEAN: if (lua_toboolean(L, -1)) lua_pushliteral(L, "true"); else lua_pushliteral(L, "false"); break; case LUA_TNUMBER: lua_pushfstring(L, "%f", lua_tonumber(L, -1)); break; case LUA_TNIL: lua_pushstring(L, "nil"); break; default: lua_pushfstring(L, "%s: %p", lua_typename(L, lua_type(L, -1)), lua_topointer(L, -1)); break; } lua_remove(L, -2); return lua_tolstring(L, -1, len); } #endif static int luaA_dofunction_on_error(lua_State *L) { /* Convert error to string, to prevent a follow-up error with lua_concat. */ luaA_tolstring(L, -1, NULL); /* duplicate string error */ lua_pushvalue(L, -1); /* emit error signal */ signal_object_emit(L, &global_signals, "debug::error", 1); if(!luaL_dostring(L, "return debug.traceback(\"error while running function!\", 3)")) { /* Move traceback before error */ lua_insert(L, -2); /* Insert sentence */ lua_pushliteral(L, "\nerror: "); /* Move it before error */ lua_insert(L, -2); lua_concat(L, 3); } return 1; } static void setup_awesome_signals(lua_State *L) { lua_getglobal(L, "awesome"); lua_pushstring(L, "unix_signal"); lua_newtable(L); #define SETUP_SIGNAL(sig) \ do { \ /* Set awesome.signals["SIGSTOP"] = 42 */ \ lua_pushinteger(L, sig); \ lua_setfield(L, -2, #sig); \ /* Set awesome.signals[42] = "SIGSTOP" */ \ lua_pushinteger(L, sig); \ lua_pushstring(L, #sig); \ lua_settable(L, -3); \ } while (0) /* Non-standard signals. These are first so that e.g. (on my system) * signals[29] is SIGPOLL and not SIGIO (the value gets overwritten). */ #ifdef SIGIOT SETUP_SIGNAL(SIGIOT); #endif #ifdef SIGEMT SETUP_SIGNAL(SIGEMT); #endif #ifdef SIGSTKFLT SETUP_SIGNAL(SIGSTKFLT); #endif #ifdef SIGIO SETUP_SIGNAL(SIGIO); #endif #ifdef SIGCLD SETUP_SIGNAL(SIGCLD); #endif #ifdef SIGPWR SETUP_SIGNAL(SIGPWR); #endif #ifdef SIGINFO SETUP_SIGNAL(SIGINFO); #endif #ifdef SIGLOST SETUP_SIGNAL(SIGLOST); #endif #ifdef SIGWINCH SETUP_SIGNAL(SIGWINCH); #endif #ifdef SIGUNUSED SETUP_SIGNAL(SIGUNUSED); #endif /* POSIX.1-1990, according to man 7 signal */ SETUP_SIGNAL(SIGHUP); SETUP_SIGNAL(SIGINT); SETUP_SIGNAL(SIGQUIT); SETUP_SIGNAL(SIGILL); SETUP_SIGNAL(SIGABRT); SETUP_SIGNAL(SIGFPE); SETUP_SIGNAL(SIGKILL); SETUP_SIGNAL(SIGSEGV); SETUP_SIGNAL(SIGPIPE); SETUP_SIGNAL(SIGALRM); SETUP_SIGNAL(SIGTERM); SETUP_SIGNAL(SIGUSR1); SETUP_SIGNAL(SIGUSR2); SETUP_SIGNAL(SIGCHLD); SETUP_SIGNAL(SIGCONT); SETUP_SIGNAL(SIGSTOP); SETUP_SIGNAL(SIGTSTP); SETUP_SIGNAL(SIGTTIN); SETUP_SIGNAL(SIGTTOU); /* POSIX.1-2001, according to man 7 signal */ SETUP_SIGNAL(SIGBUS); SETUP_SIGNAL(SIGPOLL); SETUP_SIGNAL(SIGPROF); SETUP_SIGNAL(SIGSYS); SETUP_SIGNAL(SIGTRAP); SETUP_SIGNAL(SIGURG); SETUP_SIGNAL(SIGVTALRM); SETUP_SIGNAL(SIGXCPU); SETUP_SIGNAL(SIGXFSZ); #undef SETUP_SIGNAL /* Set awesome.signal to the table we just created, key was already pushed */ lua_rawset(L, -3); /* Pop "awesome" */ lua_pop(L, 1); } /** Initialize the Lua VM * \param xdg An xdg handle to use to get XDG basedir. */ void luaA_init(xdgHandle* xdg) { lua_State *L; static const struct luaL_Reg awesome_lib[] = { { "quit", luaA_quit }, { "exec", luaA_exec }, { "spawn", luaA_spawn }, { "restart", luaA_restart }, { "connect_signal", luaA_awesome_connect_signal }, { "disconnect_signal", luaA_awesome_disconnect_signal }, { "emit_signal", luaA_awesome_emit_signal }, { "systray", luaA_systray }, { "load_image", luaA_load_image }, { "set_preferred_icon_size", luaA_set_preferred_icon_size }, { "register_xproperty", luaA_register_xproperty }, { "set_xproperty", luaA_set_xproperty }, { "get_xproperty", luaA_get_xproperty }, { "__index", luaA_awesome_index }, { "__newindex", luaA_default_newindex }, { "xkb_set_layout_group", luaA_xkb_set_layout_group}, { "xkb_get_layout_group", luaA_xkb_get_layout_group}, { "xkb_get_group_names", luaA_xkb_get_group_names}, { "xrdb_get_value", luaA_xrdb_get_value}, { "kill", luaA_kill}, { NULL, NULL } }; L = globalconf.L.real_L_dont_use_directly = luaL_newstate(); /* Set panic function */ lua_atpanic(L, luaA_panic); /* Set error handling function */ lualib_dofunction_on_error = luaA_dofunction_on_error; luaL_openlibs(L); luaA_fixups(L); luaA_object_setup(L); /* Export awesome lib */ luaA_openlib(L, "awesome", awesome_lib, awesome_lib); setup_awesome_signals(L); /* Export root lib */ luaA_registerlib(L, "root", awesome_root_lib); lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */ #ifdef WITH_DBUS /* Export D-Bus lib */ luaA_registerlib(L, "dbus", awesome_dbus_lib); lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */ #endif /* Export keygrabber lib */ luaA_registerlib(L, "keygrabber", awesome_keygrabber_lib); lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */ /* Export mousegrabber lib */ luaA_registerlib(L, "mousegrabber", awesome_mousegrabber_lib); lua_pop(L, 1); /* luaA_registerlib() leaves the table on stack */ /* Export mouse */ luaA_openlib(L, "mouse", awesome_mouse_methods, awesome_mouse_meta); /* Export screen */ screen_class_setup(L); /* Export button */ button_class_setup(L); /* Export tag */ tag_class_setup(L); /* Export window */ window_class_setup(L); /* Export drawable */ drawable_class_setup(L); /* Export drawin */ drawin_class_setup(L); /* Export client */ client_class_setup(L); /* Export keys */ key_class_setup(L); /* add Lua search paths */ lua_getglobal(L, "package"); if (LUA_TTABLE != lua_type(L, 1)) { warn("package is not a table"); return; } lua_getfield(L, 1, "path"); if (LUA_TSTRING != lua_type(L, 2)) { warn("package.path is not a string"); lua_pop(L, 1); return; } /* add XDG_CONFIG_DIR as include path */ const char * const *xdgconfigdirs = xdgSearchableConfigDirectories(xdg); for(; *xdgconfigdirs; xdgconfigdirs++) { size_t len = a_strlen(*xdgconfigdirs); lua_pushliteral(L, ";"); lua_pushlstring(L, *xdgconfigdirs, len); lua_pushliteral(L, "/awesome/?.lua"); lua_concat(L, 3); lua_pushliteral(L, ";"); lua_pushlstring(L, *xdgconfigdirs, len); lua_pushliteral(L, "/awesome/?/init.lua"); lua_concat(L, 3); lua_concat(L, 3); /* concatenate with package.path */ } /* add Lua lib path (/usr/share/awesome/lib by default) */ lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?.lua"); lua_pushliteral(L, ";" AWESOME_LUA_LIB_PATH "/?/init.lua"); lua_concat(L, 3); /* concatenate with package.path */ lua_setfield(L, 1, "path"); /* package.path = "concatenated string" */ lua_getfield(L, 1, "loaded"); lua_pop(L, 2); /* pop "package" and "package.loaded" */ signal_add(&global_signals, "debug::error"); signal_add(&global_signals, "debug::deprecation"); signal_add(&global_signals, "debug::index::miss"); signal_add(&global_signals, "debug::newindex::miss"); signal_add(&global_signals, "systray::update"); signal_add(&global_signals, "wallpaper_changed"); signal_add(&global_signals, "xkb::map_changed"); signal_add(&global_signals, "xkb::group_changed"); signal_add(&global_signals, "refresh"); signal_add(&global_signals, "startup"); signal_add(&global_signals, "exit"); signal_add(&global_signals, "screen::change"); } static void luaA_startup_error(const char *err) { if (globalconf.startup_errors.len > 0) buffer_addsl(&globalconf.startup_errors, "\n\n"); buffer_adds(&globalconf.startup_errors, err); } static bool luaA_loadrc(const char *confpath, bool run) { lua_State *L = globalconf_get_lua_State(); if(luaL_loadfile(L, confpath)) { const char *err = lua_tostring(L, -1); luaA_startup_error(err); fprintf(stderr, "%s\n", err); return false; } if(!run) { lua_pop(L, 1); return true; } /* Set the conffile right now so it can be used inside the * configuration file. */ conffile = a_strdup(confpath); /* Move error handling function before function */ lua_pushcfunction(L, luaA_dofunction_on_error); lua_insert(L, -2); if(!lua_pcall(L, 0, 0, -2)) { /* Pop luaA_dofunction_on_error */ lua_pop(L, 1); return true; } const char *err = lua_tostring(L, -1); luaA_startup_error(err); fprintf(stderr, "%s\n", err); /* An error happened, so reset this. */ conffile = NULL; /* Pop luaA_dofunction_on_error() and the error message */ lua_pop(L, 2); return false; } /** Load a configuration file. * \param xdg An xdg handle to use to get XDG basedir. * \param confpatharg The configuration file to load. * \param run Run the configuration file. */ bool luaA_parserc(xdgHandle* xdg, const char *confpatharg, bool run) { char *confpath = NULL; bool ret = false; /* try to load, return if it's ok */ if(confpatharg) { if(luaA_loadrc(confpatharg, run)) { ret = true; goto bailout; } else if(!run) goto bailout; } confpath = xdgConfigFind("awesome/rc.lua", xdg); char *tmp = confpath; /* confpath is "string1\0string2\0string3\0\0" */ while(*tmp) { if(luaA_loadrc(tmp, run)) { ret = true; goto bailout; } else if(!run) goto bailout; tmp += a_strlen(tmp) + 1; } bailout: p_delete(&confpath); return ret; } int luaA_class_index_miss_property(lua_State *L, lua_object_t *obj) { signal_object_emit(L, &global_signals, "debug::index::miss", 2); return 0; } int luaA_class_newindex_miss_property(lua_State *L, lua_object_t *obj) { signal_object_emit(L, &global_signals, "debug::newindex::miss", 3); return 0; } void luaA_emit_startup() { lua_State *L = globalconf_get_lua_State(); signal_object_emit(L, &global_signals, "startup", 0); } void luaA_emit_refresh() { lua_State *L = globalconf_get_lua_State(); signal_object_emit(L, &global_signals, "refresh", 0); } int luaA_default_index(lua_State *L) { return luaA_class_index_miss_property(L, NULL); } int luaA_default_newindex(lua_State *L) { return luaA_class_newindex_miss_property(L, NULL); } // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80