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awesome/lua.c

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/*
* lua.c - Lua configuration management
*
* Copyright © 2008 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.
*
*/
#include <errno.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <ev.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <xcb/xcb.h>
#include "awesome-version-internal.h"
#include "ewmh.h"
#include "config.h"
#include "lua.h"
#include "tag.h"
#include "client.h"
#include "screen.h"
#include "event.h"
#include "layouts/tile.h"
#include "common/socket.h"
extern awesome_t globalconf;
extern const struct luaL_reg awesome_keygrabber_lib[];
extern const struct luaL_reg awesome_mouse_methods[];
extern const struct luaL_reg awesome_mouse_meta[];
extern const struct luaL_reg awesome_screen_methods[];
extern const struct luaL_reg awesome_screen_meta[];
extern const struct luaL_reg awesome_client_methods[];
extern const struct luaL_reg awesome_client_meta[];
extern const struct luaL_reg awesome_titlebar_methods[];
extern const struct luaL_reg awesome_titlebar_meta[];
extern const struct luaL_reg awesome_tag_methods[];
extern const struct luaL_reg awesome_tag_meta[];
extern const struct luaL_reg awesome_widget_methods[];
extern const struct luaL_reg awesome_widget_meta[];
extern const struct luaL_reg awesome_statusbar_methods[];
extern const struct luaL_reg awesome_statusbar_meta[];
extern const struct luaL_reg awesome_keybinding_methods[];
extern const struct luaL_reg awesome_keybinding_meta[];
static struct sockaddr_un *addr;
static ev_io csio = { .fd = -1 };
/** Add a global mouse binding. This binding will be available when you'll
* click on root window.
* \param L The Lua VM state.
*
* \luastack
* \lparam A mouse button binding.
*/
static int
luaA_mouse_add(lua_State *L)
{
button_t **button = luaA_checkudata(L, 1, "mouse");
button_list_push(&globalconf.buttons.root, *button);
button_ref(button);
return 0;
}
/** Quit awesome.
*/
static int
luaA_quit(lua_State *L __attribute__ ((unused)))
{
ev_unloop(globalconf.loop, 1);
return 0;
}
/** Execute another application, probably a window manager, to replace
* awesome.
* \param L The Lua VM state.
*
* \luastack
* \lparam The command line to execute.
*/
static int
luaA_exec(lua_State *L)
{
client_t *c;
const char *cmd = luaL_checkstring(L, 1);
for(c = globalconf.clients; c; c = c->next)
client_unban(c);
xcb_flush(globalconf.connection);
xcb_disconnect(globalconf.connection);
a_exec(cmd);
return 0;
}
/** Restart awesome.
*/
static int
luaA_restart(lua_State *L __attribute__ ((unused)))
{
ewmh_restart();
return 0;
}
/** Set the function called each time a client gets focus. This function is
* called with the client object as argument.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*
* \luastack
* \lparam A function to call each time a client gets focus.
*/
static int
luaA_hooks_focus(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.focus);
}
/** Set the function called each time a client loses focus. This function is
* called with the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call each time a client loses focus.
*/
static int
luaA_hooks_unfocus(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.unfocus);
}
/** Set the function called each time a new client appears. This function is
* called with the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call on each new client.
*/
static int
luaA_hooks_manage(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.manage);
}
/** Set the function called each time a client goes away. This function is
* called with the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call when a client goes away.
*/
static int
luaA_hooks_unmanage(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.unmanage);
}
/** Set the function called each time the mouse enter a new window. This
* function is called with the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call each time a client gets mouse over it.
*/
static int
luaA_hooks_mouseover(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.mouseover);
}
/** Set the function called on each screen arrange. This function is called
* with the screen number as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call on each screen arrange.
*/
static int
luaA_hooks_arrange(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.arrange);
}
/** Set the function called on each title update. This function is called with
* the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call on each title update of each client.
*/
static int
luaA_hooks_titleupdate(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.titleupdate);
}
/** Set the function called when a client get urgency flag. This function is called with
* the client object as argument.
* \param L The Lua VM state.
*
* \luastack
* \lparam A function to call when a client get the urgent flag.
*/
static int
luaA_hooks_urgent(lua_State *L)
{
return luaA_registerfct(L, &globalconf.hooks.urgent);
}
/** Set the function to be called every N seconds.
* \param L The Lua VM state.
*
* \luastack
* \lparam The number of seconds to run function every. Set 0 to disable.
* \lparam A function to call every N seconds (optional).
*/
static int
luaA_hooks_timer(lua_State *L)
{
globalconf.timer.repeat = luaL_checknumber(L, 1);
if(lua_gettop(L) == 2 && !lua_isnil(L, 2))
luaA_registerfct(L, &globalconf.hooks.timer);
ev_timer_again(globalconf.loop, &globalconf.timer);
return 0;
}
/** Set default font.
* \param L The Lua VM state.
*
* \luastack
* \lparam A string with a font name in Pango format.
*/
static int
luaA_font_set(lua_State *L)
{
const char *font = luaL_checkstring(L, 1);
draw_font_delete(&globalconf.font);
globalconf.font = draw_font_new(globalconf.connection,
globalconf.default_screen, font);
return 0;
}
/** Set default colors.
* \param L The Lua VM state.
*
* \luastack
* \lparam A table with `fg' and `bg' elements, containing colors.
*/
static int
luaA_colors_set(lua_State *L)
{
const char *buf;
size_t len;
int8_t colors_nbr = -1, i;
xcolor_init_request_t reqs[2];
luaA_checktable(L, 1);
if((buf = luaA_getopt_lstring(L, 1, "fg", NULL, &len)))
reqs[++colors_nbr] = xcolor_init_unchecked(globalconf.connection,
&globalconf.colors.fg,
globalconf.default_screen,
buf, len);
if((buf = luaA_getopt_lstring(L, 1, "bg", NULL, &len)))
reqs[++colors_nbr] = xcolor_init_unchecked(globalconf.connection,
&globalconf.colors.bg,
globalconf.default_screen,
buf, len);
for(i = 0; i <= colors_nbr; i++)
xcolor_init_reply(globalconf.connection, reqs[i]);
return 0;
}
/** Push a pointer onto the stack according to its type.
* \param p The pointer.
* \param type Its type.
*/
void
luaA_pushpointer(lua_State *L, void *p, awesome_type_t type)
{
switch(type)
{
case AWESOME_TYPE_STATUSBAR:
luaA_statusbar_userdata_new(L, p);
break;
case AWESOME_TYPE_TITLEBAR:
luaA_titlebar_userdata_new(L, p);
break;
}
}
static void
luaA_openlib(lua_State *L, const char *name,
const struct luaL_reg methods[],
const struct luaL_reg meta[])
{
luaL_newmetatable(L, name); /* 1 */
lua_pushvalue(L, -1); /* dup metatable 2 */
lua_setfield(L, -2, "__index"); /* metatable.__index = metatable 1 */
luaL_register(L, NULL, meta); /* 1 */
luaL_register(L, name, methods); /* 2 */
lua_pushvalue(L, -1); /* dup self as metatable 3 */
lua_setmetatable(L, -2); /* set self as metatable 2 */
lua_pop(L, 2);
}
static int
luaA_mbstrlen(lua_State *L)
{
const char *cmd = luaL_checkstring(L, 1);
lua_pushnumber(L, mbstowcs(NULL, NONULL(cmd), 0));
return 1;
}
static int
luaA_next(lua_State *L)
{
if(luaL_getmetafield(L, 1, "__next"))
{
lua_insert(L, 1);
lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
return lua_gettop(L);
}
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 2);
if(lua_next(L, 1))
return 2;
lua_pushnil(L);
return 1;
}
static int
luaA_pairs(lua_State *L)
{
if(luaL_getmetafield(L, 1, "__pairs"))
{
lua_insert(L, 1);
lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
return lua_gettop(L);
}
luaL_checktype(L, 1, LUA_TTABLE);
return luaA_generic_pairs(L);
}
static void
luaA_fixups(lua_State *L)
{
lua_getglobal(L, "string");
lua_pushcfunction(L, luaA_mbstrlen);
lua_setfield(L, -2, "len");
lua_pop(L, 1);
lua_pushliteral(L, "next");
lua_pushcfunction(L, luaA_next);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushliteral(L, "pairs");
lua_pushcfunction(L, luaA_next);
lua_pushcclosure(L, luaA_pairs, 1); /* pairs get next as upvalue */
lua_settable(L, LUA_GLOBALSINDEX);
}
/** Object table.
* This table can use safely object as key.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
int
luaA_otable_index(lua_State *L)
{
void **obj, **v;
if((obj = lua_touserdata(L, 2)))
{
/* begins at nil */
lua_pushnil(L);
while(lua_next(L, 1))
{
/* check the key against the key if the key is a userdata,
* otherwise check it again the value. */
if((v = lua_touserdata(L, -2))
&& *v == *obj)
/* return value */
return 1;
else if((v = lua_touserdata(L, -1))
&& *v == *obj)
{
/* return key */
lua_pop(L, 1);
return 1;
}
/* removes 'value'; keeps 'key' for next iteration */
lua_pop(L, 1);
}
return 0;
}
lua_rawget(L, 1);
return 1;
}
/** Object table.
* This table can use safely object as key.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_otable_newindex(lua_State *L)
{
void **obj, **v;
if((obj = lua_touserdata(L, 2)))
{
/* begins at nil */
lua_pushnil(L);
while(lua_next(L, 1))
{
if((v = lua_touserdata(L, -2))
&& *v == *obj)
{
/* remove value */
lua_pop(L, 1);
/* push new value on top */
lua_pushvalue(L, 3);
/* set in table key = value */
lua_rawset(L, 1);
return 0;
}
/* removes 'value'; keeps 'key' for next iteration */
lua_pop(L, 1);
}
}
lua_rawset(L, 1);
return 0;
}
/** Spawn a program.
* This function is multi-head (Zaphod) aware and will set display to
* the right screen according to mouse position.
* \param L The Lua VM state.
* \return The number of elements pushed on stack
* \luastack
* \lparam The command to launch.
* \lparam The optional screen number to spawn the command on.
*/
static int
luaA_spawn(lua_State *L)
{
static const char *shell = NULL;
char *host, newdisplay[128];
const char *cmd;
int screen = 0, screenp, displayp;
if(!shell && !(shell = getenv("SHELL")))
shell = "/bin/sh";
if(lua_gettop(L) == 2)
{
screen = luaL_checknumber(L, 2) - 1;
luaA_checkscreen(screen);
}
cmd = luaL_checkstring(L, 1);
if(!globalconf.screens_info->xinerama_is_active)
{
xcb_parse_display(NULL, &host, &displayp, &screenp);
snprintf(newdisplay, sizeof(newdisplay), "%s:%d.%d", host, displayp, screen);
setenv("DISPLAY", newdisplay, 1);
p_delete(&host);
}
/* The double-fork construct avoids zombie processes and keeps the code
* clean from stupid signal handlers. */
if(fork() == 0)
{
if(fork() == 0)
{
if(globalconf.connection)
xcb_disconnect(globalconf.connection);
setsid();
execl(shell, shell, "-c", cmd, NULL);
warn("execl '%s -c %s' failed: %s\n", shell, cmd, strerror(errno));
}
exit(EXIT_SUCCESS);
}
wait(0);
return 0;
}
/** Initialize the Lua VM
*/
void
luaA_init(void)
{
lua_State *L;
static const struct luaL_reg otable_methods[] =
{
{ "__call", luaA_otable_new },
{ NULL, NULL }
};
static const struct luaL_reg otable_meta[] =
{
{ "__index", luaA_otable_index },
{ "__newindex", luaA_otable_newindex },
{ NULL, NULL }
};
static const struct luaL_reg awesome_lib[] =
{
{ "quit", luaA_quit },
{ "exec", luaA_exec },
{ "spawn", luaA_spawn },
{ "restart", luaA_restart },
{ "mouse_add", luaA_mouse_add },
{ "font_set", luaA_font_set },
{ "colors_set", luaA_colors_set },
{ NULL, NULL }
};
static const struct luaL_reg awesome_hooks_lib[] =
{
{ "focus", luaA_hooks_focus },
{ "unfocus", luaA_hooks_unfocus },
{ "manage", luaA_hooks_manage },
{ "unmanage", luaA_hooks_unmanage },
{ "mouseover", luaA_hooks_mouseover },
{ "arrange", luaA_hooks_arrange },
{ "titleupdate", luaA_hooks_titleupdate },
{ "urgent", luaA_hooks_urgent },
{ "timer", luaA_hooks_timer },
{ NULL, NULL }
};
L = globalconf.L = luaL_newstate();
luaL_openlibs(L);
luaA_fixups(L);
/* Export awesome lib */
luaL_register(L, "awesome", awesome_lib);
/* Export hooks lib */
luaL_register(L, "hooks", awesome_hooks_lib);
/* Export keygrabber lib */
luaL_register(L, "keygrabber", awesome_keygrabber_lib);
/* Export otable lib */
luaA_openlib(L, "otable", otable_methods, otable_meta);
/* Export screen */
luaA_openlib(L, "screen", awesome_screen_methods, awesome_screen_meta);
/* Export mouse */
luaA_openlib(L, "mouse", awesome_mouse_methods, awesome_mouse_meta);
/* Export tag */
luaA_openlib(L, "tag", awesome_tag_methods, awesome_tag_meta);
/* Export statusbar */
luaA_openlib(L, "statusbar", awesome_statusbar_methods, awesome_statusbar_meta);
/* Export widget */
luaA_openlib(L, "widget", awesome_widget_methods, awesome_widget_meta);
/* Export client */
luaA_openlib(L, "client", awesome_client_methods, awesome_client_meta);
/* Export titlebar */
luaA_openlib(L, "titlebar", awesome_titlebar_methods, awesome_titlebar_meta);
/* Export keys */
luaA_openlib(L, "keybinding", awesome_keybinding_methods, awesome_keybinding_meta);
lua_pushliteral(L, "AWESOME_VERSION");
lua_pushstring(L, AWESOME_VERSION);
lua_settable(L, LUA_GLOBALSINDEX);
luaA_dostring(L, "package.path = package.path .. \";" AWESOME_LUA_LIB_PATH "/?.lua\"");
luaA_dostring(L, "package.path = package.path .. \";" AWESOME_LUA_LIB_PATH "/?/init.lua\"");
/* init hooks */
globalconf.hooks.manage = LUA_REFNIL;
globalconf.hooks.unmanage = LUA_REFNIL;
globalconf.hooks.focus = LUA_REFNIL;
globalconf.hooks.unfocus = LUA_REFNIL;
globalconf.hooks.mouseover = LUA_REFNIL;
globalconf.hooks.arrange = LUA_REFNIL;
globalconf.hooks.titleupdate = LUA_REFNIL;
globalconf.hooks.urgent = LUA_REFNIL;
globalconf.hooks.timer = LUA_REFNIL;
}
#define XDG_CONFIG_HOME_DEFAULT "/.config"
#define AWESOME_CONFIG_FILE "/awesome/rc.lua"
/** Load a configuration file.
* \param rcfile The configuration file to load.
*/
void
luaA_parserc(const char *confpatharg)
{
int screen;
const char *confdir, *xdg_config_dirs;
char *confpath = NULL, **xdg_files, **buf, path[1024];
ssize_t len;
if(confpatharg)
{
if(luaL_dofile(globalconf.L, confpatharg))
fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
else
goto bailout;
}
confdir = getenv("XDG_CONFIG_HOME");
if((len = a_strlen(confdir)))
{
len += sizeof(AWESOME_CONFIG_FILE);
confpath = p_new(char, len);
a_strcpy(confpath, len, confdir);
/* update package.path */
snprintf(path, sizeof(path) - 1, "package.path = package.path .. \";%s/awesome/?.lua\"", confdir);
luaA_dostring(globalconf.L, path);
}
else
{
confdir = getenv("HOME");
len = a_strlen(confdir) + sizeof(AWESOME_CONFIG_FILE)-1 + sizeof(XDG_CONFIG_HOME_DEFAULT);
confpath = p_new(char, len);
a_strcpy(confpath, len, confdir);
a_strcat(confpath, len, XDG_CONFIG_HOME_DEFAULT);
/* update package.path */
snprintf(path, sizeof(path) - 1, "package.path = package.path .. \";%s" XDG_CONFIG_HOME_DEFAULT "/awesome/?.lua\"", confdir);
luaA_dostring(globalconf.L, path);
}
a_strcat(confpath, len, AWESOME_CONFIG_FILE);
if(luaL_dofile(globalconf.L, confpath))
fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
else
goto bailout;
xdg_config_dirs = getenv("XDG_CONFIG_DIRS");
if(!(len = a_strlen(xdg_config_dirs)))
{
xdg_config_dirs = XDG_CONFIG_DIR;
len = sizeof(XDG_CONFIG_DIR) - 1;
}
xdg_files = a_strsplit(xdg_config_dirs, len, ':');
for(buf = xdg_files; *buf; buf++)
{
p_delete(&confpath);
len = a_strlen(*buf) + sizeof("AWESOME_CONFIG_FILE");
confpath = p_new(char, len);
a_strcpy(confpath, len, *buf);
a_strcat(confpath, len, AWESOME_CONFIG_FILE);
snprintf(path, sizeof(path) - 1, "package.path = package.path .. \";%s/awesome/?.lua\"", *buf);
luaA_dostring(globalconf.L, path);
if(luaL_dofile(globalconf.L, confpath))
fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
else
break;
}
for(buf = xdg_files; *buf; buf++)
p_delete(buf);
p_delete(&xdg_files);
bailout:
/* Assure there's at least one tag */
for(screen = 0; screen < globalconf.screens_info->nscreen; screen++)
if(!globalconf.screens[screen].tags.len)
tag_append_to_screen(tag_new("default", sizeof("default")-1, layout_tile, 0.5, 1, 0),
&globalconf.screens[screen]);
p_delete(&confpath);
}
/** Parse a command.
* \param cmd The buffer to parse.
* \return true on succes, false on failure.
*/
static void
luaA_docmd(const char *cmd)
{
char *p;
while((p = strchr(cmd, '\n')))
{
*p = '\0';
luaA_dostring(globalconf.L, cmd);
cmd = p + 1;
}
}
static void
luaA_cb(EV_P_ ev_io *w, int revents)
{
char buf[1024];
int r;
switch(r = recv(w->fd, buf, sizeof(buf)-1, MSG_TRUNC))
{
case -1:
warn("error reading UNIX domain socket: %s", strerror(errno));
luaA_cs_cleanup();
break;
case 0:
break;
default:
if(r >= ssizeof(buf))
break;
buf[r] = '\0';
luaA_docmd(buf);
}
awesome_refresh(globalconf.connection);
}
void
luaA_cs_init(void)
{
int csfd = socket_getclient();
if (csfd < 0 || fcntl(csfd, F_SETFD, FD_CLOEXEC) == -1)
return;
addr = socket_getaddr(getenv("DISPLAY"));
if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
{
if(errno == EADDRINUSE)
{
if(unlink(addr->sun_path))
warn("error unlinking existing file: %s", strerror(errno));
if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
warn("error binding UNIX domain socket: %s", strerror(errno));
}
else
warn("error binding UNIX domain socket: %s", strerror(errno));
}
ev_io_init(&csio, &luaA_cb, csfd, EV_READ);
ev_io_start(EV_DEFAULT_UC_ &csio);
ev_unref(EV_DEFAULT_UC);
}
void
luaA_cs_cleanup(void)
{
if(csio.fd < 0)
return;
ev_ref(EV_DEFAULT_UC);
ev_io_stop(EV_DEFAULT_UC_ &csio);
if (close(csio.fd))
warn("error closing UNIX domain socket: %s", strerror(errno));
if(unlink(addr->sun_path))
warn("error unlinking UNIX domain socket: %s", strerror(errno));
p_delete(&addr);
csio.fd = -1;
}
void
luaA_on_timer(EV_P_ ev_timer *w, int revents)
{
luaA_dofunction(globalconf.L, globalconf.hooks.timer, 0, 0);
awesome_refresh(globalconf.connection);
}
void
luaA_pushcolor(lua_State *L, const xcolor_t *c)
{
uint8_t r = (unsigned)c->red * 0xff / 0xffff;
uint8_t g = (unsigned)c->green * 0xff / 0xffff;
uint8_t b = (unsigned)c->blue * 0xff / 0xffff;
uint8_t a = (unsigned)c->alpha * 0xff / 0xffff;
char s[10];
snprintf(s, sizeof(s), "#%02x%02x%02x%02x", r, g, b, a);
lua_pushlstring(L, s, sizeof(s));
}
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