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611 lines (527 loc) · 15.6 KB
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/*
* luaa.c - Lua configuration management
*
* Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
*
* 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.
*
*/
#define _GNU_SOURCE
#include "luaa.h"
#include "globalconf.h"
#include "awesome-version-internal.h"
#include "awesome.h"
#include "common/backtrace.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 "objects/timer.h"
#include "property.h"
#include "selection.h"
#include "spawn.h"
#include "systray.h"
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <basedir_fs.h>
#include <xcb/xcb_atom.h>
#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[];
/** 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.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_quit(lua_State *L)
{
g_main_loop_quit(globalconf.loop);
return 0;
}
/** Execute another application, probably a window manager, to replace
* awesome.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lparam The command line to execute.
*/
static int
luaA_exec(lua_State *L)
{
const char *cmd = luaL_checkstring(L, 1);
awesome_atexit(false);
a_exec(cmd);
return 0;
}
/** Restart awesome.
*/
static int
luaA_restart(lua_State *L)
{
awesome_restart();
return 0;
}
/** Load an image from a given path.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lparam The command line to execute.
*/
static int
luaA_load_image(lua_State *L)
{
const char *filename = luaL_checkstring(L, 1);
cairo_surface_t *surface = draw_load_image(L, filename);
if (!surface)
return 0;
/* lua has to make sure to free the ref or we have a leak */
lua_pushlightuserdata(L, surface);
return 1;
}
/** 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_pushnumber(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.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lfield conffile The configuration file which has been loaded.
* \lfield version The version of awesome.
* \lfield release The release name of awesome.
* \lfield startup True if we are still in startup, false otherwise.
* \lfield startup_errors Error message for errors that occured during startup.
* \lfield composite_manager_running True if a composite manager is running.
*/
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_pushliteral(L, AWESOME_VERSION);
return 1;
}
if(A_STREQ(buf, "release"))
{
lua_pushliteral(L, AWESOME_RELEASE);
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;
}
return luaA_default_index(L);
}
/** Add a global signal.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lparam A string with the event name.
* \lparam The function to call.
*/
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 L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lparam A string with the event name.
* \lparam The function to call.
*/
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 L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lparam A string with the event name.
* \lparam The function to call.
*/
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;
}
static int
luaA_dofunction_on_error(lua_State *L)
{
/* 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;
}
/** 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 },
{ "register_xproperty", luaA_register_xproperty },
{ "set_xproperty", luaA_set_xproperty },
{ "get_xproperty", luaA_get_xproperty },
{ "__index", luaA_awesome_index },
{ "__newindex", luaA_default_newindex },
{ NULL, NULL }
};
L = globalconf.L = 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);
/* 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);
/* Export timer */
timer_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, "refresh");
signal_add(&global_signals, "exit");
}
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)
{
if(!luaL_loadfile(globalconf.L, confpath))
{
if(run)
{
/* 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(globalconf.L, luaA_dofunction_on_error);
lua_insert(globalconf.L, -2);
if(lua_pcall(globalconf.L, 0, LUA_MULTRET, -2))
{
const char *err = lua_tostring(globalconf.L, -1);
luaA_startup_error(err);
fprintf(stderr, "%s\n", err);
/* An error happened, so reset this. */
conffile = NULL;
}
else
return true;
}
else
{
lua_pop(globalconf.L, 1);
return true;
}
}
else
{
const char *err = lua_tostring(globalconf.L, -1);
luaA_startup_error(err);
fprintf(stderr, "%s\n", err);
}
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_refresh()
{
signal_object_emit(globalconf.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