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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 <ev.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <basedir_fs.h>
#include "awesome.h"
#include "awesome-version-internal.h"
#include "ewmh.h"
#include "luaa.h"
#include "spawn.h"
#include "tag.h"
#include "client.h"
#include "screen.h"
#include "event.h"
#include "selection.h"
#include "window.h"
#include "common/xcursor.h"
#include "common/buffer.h"
#ifdef WITH_DBUS
extern const struct luaL_reg awesome_dbus_lib[];
#endif
extern const struct luaL_reg awesome_hooks_lib[];
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_button_methods[];
extern const struct luaL_reg awesome_button_meta[];
extern const struct luaL_reg awesome_image_methods[];
extern const struct luaL_reg awesome_image_meta[];
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_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_wibox_methods[];
extern const struct luaL_reg awesome_wibox_meta[];
extern const struct luaL_reg awesome_key_methods[];
extern const struct luaL_reg awesome_key_meta[];
DO_ARRAY(const void *, void, DO_NOTHING)
/** Quit awesome.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
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.
* \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();
a_exec(cmd);
return 0;
}
/** Restart awesome.
*/
static int
luaA_restart(lua_State *L __attribute__ ((unused)))
{
awesome_restart();
return 0;
}
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);
}
/** 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;
}
/** Overload standard Lua next function to use __next key on metatable.
* \param L The Lua VM state.
* \param The number of elements pushed on stack.
*/
static int
luaAe_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;
}
/** Overload lua_next() function by using __next metatable field
* to get next elements.
* \param L The Lua VM stack.
* \param idx The index number of elements in stack.
* \return 1 if more elements to come, 0 otherwise.
*/
int
luaA_next(lua_State *L, int idx)
{
if(luaL_getmetafield(L, idx, "__next"))
{
/* if idx is relative, reduce it since we got __next */
if(idx < 0) idx--;
/* copy table and then move key */
lua_pushvalue(L, idx);
lua_pushvalue(L, -3);
lua_remove(L, -4);
lua_pcall(L, 2, 2, 0);
/* next returned nil, it's the end */
if(lua_isnil(L, -1))
{
/* remove nil */
lua_pop(L, 2);
return 0;
}
return 1;
}
else if(lua_istable(L, idx))
return lua_next(L, idx);
/* remove the key */
lua_pop(L, 1);
return 0;
}
/** Generic pairs function.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_generic_pairs(lua_State *L)
{
lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
lua_pushvalue(L, 1); /* state, */
lua_pushnil(L); /* and initial value */
return 3;
}
/** Overload standard pairs function to use __pairs field of metatables.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaAe_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 int
luaA_ipairs_aux(lua_State *L)
{
int i = luaL_checkint(L, 2) + 1;
luaL_checktype(L, 1, LUA_TTABLE);
lua_pushinteger(L, i);
lua_rawgeti(L, 1, i);
return (lua_isnil(L, -1)) ? 0 : 2;
}
/** Overload standard ipairs function to use __ipairs field of metatables.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaAe_ipairs(lua_State *L)
{
if(luaL_getmetafield(L, 1, "__ipairs"))
{
lua_insert(L, 1);
lua_call(L, lua_gettop(L) - 1, LUA_MULTRET);
return lua_gettop(L);
}
luaL_checktype(L, 1, LUA_TTABLE);
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, 1);
lua_pushinteger(L, 0); /* and initial value */
return 3;
}
/** 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);
#define CHECK_TYPE(type) \
do { \
if(luaA_toudata(L, 1, #type)) \
{ \
lua_pushliteral(L, #type); \
return 1; \
} \
} while(0)
CHECK_TYPE(wibox);
CHECK_TYPE(client);
CHECK_TYPE(image);
CHECK_TYPE(key);
CHECK_TYPE(button);
CHECK_TYPE(tag);
CHECK_TYPE(widget);
#undef CHECK_TYPE
lua_pushstring(L, luaL_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 next */
lua_pushliteral(L, "next");
lua_pushcfunction(L, luaAe_next);
lua_settable(L, LUA_GLOBALSINDEX);
/* replace pairs */
lua_pushliteral(L, "pairs");
lua_pushcfunction(L, luaAe_next);
lua_pushcclosure(L, luaAe_pairs, 1); /* pairs get next as upvalue */
lua_settable(L, LUA_GLOBALSINDEX);
/* replace ipairs */
lua_pushliteral(L, "ipairs");
lua_pushcfunction(L, luaA_ipairs_aux);
lua_pushcclosure(L, luaAe_ipairs, 1);
lua_settable(L, LUA_GLOBALSINDEX);
/* replace type */
lua_pushliteral(L, "type");
lua_pushcfunction(L, luaAe_type);
lua_settable(L, LUA_GLOBALSINDEX);
/* set selection */
lua_pushliteral(L, "selection");
lua_pushcfunction(L, luaA_selection_get);
lua_settable(L, LUA_GLOBALSINDEX);
}
/** __next function for wtable objects.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_wtable_next(lua_State *L)
{
/* upvalue 1 is content table */
if(lua_next(L, lua_upvalueindex(1)))
return 2;
lua_pushnil(L);
return 1;
}
/** __ipairs function for wtable objects.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_wtable_ipairs(lua_State *L)
{
/* push ipairs_aux */
lua_pushvalue(L, lua_upvalueindex(2));
/* push content table */
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushinteger(L, 0); /* and initial value */
return 3;
}
/** Index function of wtable objects.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_wtable_index(lua_State *L)
{
size_t len;
const char *buf;
lua_pushvalue(L, 2);
/* check for size, waiting lua 5.2 and __len on tables */
if((buf = lua_tolstring(L, -1, &len)))
if(a_tokenize(buf, len) == A_TK_LEN)
{
lua_pushnumber(L, lua_objlen(L, lua_upvalueindex(1)));
return 1;
}
lua_pop(L, 1);
/* upvalue 1 is content table */
lua_rawget(L, lua_upvalueindex(1));
return 1;
}
/** Newndex function of wtable objects.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_wtable_newindex(lua_State *L)
{
bool invalid = false;
/* push key on top */
lua_pushvalue(L, 2);
/* get current key value in content table */
lua_rawget(L, lua_upvalueindex(1));
/* if value is a widget, notify change */
if(lua_istable(L, -1) || luaA_toudata(L, -1, "widget"))
invalid = true;
lua_pop(L, 1); /* remove value */
/* if new value is a widget or a table */
if(lua_istable(L, 3))
{
luaA_table2wtable(L);
invalid = true;
}
else if(!invalid && luaA_toudata(L, 3, "widget"))
invalid = true;
/* upvalue 1 is content table */
lua_rawset(L, lua_upvalueindex(1));
if(invalid)
luaA_wibox_invalidate_byitem(L, lua_topointer(L, 1));
return 0;
}
/** Convert the top element of the stack to a proxied wtable.
* \param L The Lua VM state.
*/
void
luaA_table2wtable(lua_State *L)
{
if(!lua_istable(L, -1))
return;
lua_newtable(L); /* create *real* content table */
lua_createtable(L, 0, 5); /* metatable */
lua_pushvalue(L, -2); /* copy content table */
lua_pushcfunction(L, luaA_ipairs_aux); /* push ipairs aux */
lua_pushcclosure(L, luaA_wtable_ipairs, 2);
lua_pushvalue(L, -3); /* copy content table */
lua_pushcclosure(L, luaA_wtable_next, 1); /* __next has the content table as upvalue */
lua_pushvalue(L, -4); /* copy content table */
lua_pushcclosure(L, luaA_wtable_index, 1); /* __index has the content table as upvalue */
lua_pushvalue(L, -5); /* copy content table */
lua_pushcclosure(L, luaA_wtable_newindex, 1); /* __newindex has the content table as upvalue */
/* set metatable field with just pushed closure */
lua_setfield(L, -5, "__newindex");
lua_setfield(L, -4, "__index");
lua_setfield(L, -3, "__next");
lua_setfield(L, -2, "__ipairs");
/* set metatable impossible to touch */
lua_pushliteral(L, "wtable");
lua_setfield(L, -2, "__metatable");
/* set new metatable on original table */
lua_setmetatable(L, -3);
/* initial key */
lua_pushnil(L);
/* go through original table */
while(lua_next(L, -3))
{
/* if convert value to wtable */
luaA_table2wtable(L);
/* copy key */
lua_pushvalue(L, -2);
/* move key before value */
lua_insert(L, -2);
/* set same value in content table */
lua_rawset(L, -4);
/* copy key */
lua_pushvalue(L, -1);
/* push the new value :-> */
lua_pushnil(L);
/* set orig[k] = nil */
lua_rawset(L, -5);
}
/* remove content table */
lua_pop(L, 1);
}
/** Look for an item: table, function, etc.
* \param L The Lua VM state.
* \param item The pointer item.
*/
bool
luaA_hasitem(lua_State *L, const void *item)
{
lua_pushnil(L);
while(luaA_next(L, -2))
{
if(lua_topointer(L, -1) == item)
{
/* remove value and key */
lua_pop(L, 2);
return true;
}
if(lua_istable(L, -1))
if(luaA_hasitem(L, item))
{
/* remove key and value */
lua_pop(L, 2);
return true;
}
/* remove value */
lua_pop(L, 1);
}
return false;
}
/** Browse a table pushed on top of the index, and put all its table and
* sub-table into an array.
* \param L The Lua VM state.
* \param elems The elements array.
* \return False if we encounter an elements already in list.
*/
static bool
luaA_isloop_check(lua_State *L, void_array_t *elems)
{
if(lua_istable(L, -1))
{
const void *object = lua_topointer(L, -1);
/* Check that the object table is not already in the list */
for(int i = 0; i < elems->len; i++)
if(elems->tab[i] == object)
return false;
/* push the table in the elements list */
void_array_append(elems, object);
/* look every object in the "table" */
lua_pushnil(L);
while(luaA_next(L, -2))
{
if(!luaA_isloop_check(L, elems))
{
/* remove key and value */
lua_pop(L, 2);
return false;
}
/* remove value, keep key for next iteration */
lua_pop(L, 1);
}
}
return true;
}
/** Check if a table is a loop. When using tables as direct acyclic digram,
* this is useful.
* \param L The Lua VM state.
* \param idx The index of the table in the stack
* \return True if the table loops.
*/
bool
luaA_isloop(lua_State *L, int idx)
{
/* elems is an elements array that we will fill with all array we
* encounter while browsing the tables */
void_array_t elems;
void_array_init(&elems);
/* push table on top */
lua_pushvalue(L, idx);
bool ret = luaA_isloop_check(L, &elems);
/* remove pushed table */
lua_pop(L, 1);
void_array_wipe(&elems);
return !ret;
}
/** awesome global table.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lfield font The default font.
* \lfield conffile The configuration file which has been loaded.
*/
static int
luaA_awesome_index(lua_State *L)
{
if(luaA_usemetatable(L, 1, 2))
return 1;
size_t len;
const char *buf = luaL_checklstring(L, 2, &len);
switch(a_tokenize(buf, len))
{
case A_TK_FONT:
{
char *font = pango_font_description_to_string(globalconf.font->desc);
lua_pushstring(L, font);
g_free(font);
}
break;
case A_TK_CONFFILE:
lua_pushstring(L, globalconf.conffile);
break;
case A_TK_FG:
luaA_pushxcolor(L, &globalconf.colors.fg);
break;
case A_TK_BG:
luaA_pushxcolor(L, &globalconf.colors.bg);
break;
case A_TK_VERSION:
lua_pushliteral(L, AWESOME_VERSION);
break;
case A_TK_RELEASE:
lua_pushliteral(L, AWESOME_RELEASE);
break;
default:
return 0;
}
return 1;
}
/** Newindex function for the awesome global table.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_awesome_newindex(lua_State *L)
{
if(luaA_usemetatable(L, 1, 2))
return 1;
size_t len;
const char *buf = luaL_checklstring(L, 2, &len);
switch(a_tokenize(buf, len))
{
case A_TK_FONT:
{
const char *newfont = luaL_checkstring(L, 3);
draw_font_delete(&globalconf.font);
globalconf.font = draw_font_new(newfont);
/* refresh all wiboxes */
foreach(screen, globalconf.screens)
foreach(wibox, screen->wiboxes)
(*wibox)->need_update = true;
foreach(c, globalconf.clients)
if((*c)->titlebar)
(*c)->titlebar->need_update = true;
}
break;
case A_TK_FG:
if((buf = luaL_checklstring(L, 3, &len)))
xcolor_init_reply(xcolor_init_unchecked(&globalconf.colors.fg, buf, len));
break;
case A_TK_BG:
if((buf = luaL_checklstring(L, 3, &len)))
xcolor_init_reply(xcolor_init_unchecked(&globalconf.colors.bg, buf, len));
break;
default:
return 0;
}
return 0;
}
/** 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 },
{ "__index", luaA_awesome_index },
{ "__newindex", luaA_awesome_newindex },
{ NULL, NULL }
};
L = globalconf.L = luaL_newstate();
luaL_openlibs(L);
luaA_fixups(L);
/* Export awesome lib */
luaA_openlib(L, "awesome", awesome_lib, awesome_lib);
/* Export root lib */
luaL_register(L, "root", awesome_root_lib);
lua_pop(L, 1); /* luaL_register() leaves the table on stack */
/* Export hooks lib */
luaL_register(L, "hooks", awesome_hooks_lib);
lua_pop(L, 1); /* luaL_register() leaves the table on stack */
#ifdef WITH_DBUS
/* Export D-Bus lib */
luaL_register(L, "dbus", awesome_dbus_lib);
lua_pop(L, 1); /* luaL_register() leaves the table on stack */
#endif
/* Export keygrabber lib */
luaL_register(L, "keygrabber", awesome_keygrabber_lib);
lua_pop(L, 1); /* luaL_register() leaves the table on stack */
/* Export mousegrabber lib */
luaL_register(L, "mousegrabber", awesome_mousegrabber_lib);
lua_pop(L, 1); /* luaL_register() leaves the table on stack */
/* 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 button */
luaA_openlib(L, "button", awesome_button_methods, awesome_button_meta);
/* Export image */
luaA_openlib(L, "image", awesome_image_methods, awesome_image_meta);
/* Export tag */
luaA_openlib(L, "tag", awesome_tag_methods, awesome_tag_meta);
/* Export wibox */
luaA_openlib(L, "wibox", awesome_wibox_methods, awesome_wibox_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 keys */
luaA_openlib(L, "key", awesome_key_methods, awesome_key_meta);
/* init hooks */
globalconf.hooks.manage = LUA_REFNIL;
globalconf.hooks.unmanage = LUA_REFNIL;
globalconf.hooks.focus = LUA_REFNIL;
globalconf.hooks.unfocus = LUA_REFNIL;
globalconf.hooks.mouse_enter = LUA_REFNIL;
globalconf.hooks.mouse_leave = LUA_REFNIL;
globalconf.hooks.arrange = LUA_REFNIL;
globalconf.hooks.clients = LUA_REFNIL;
globalconf.hooks.tags = LUA_REFNIL;
globalconf.hooks.tagged = LUA_REFNIL;
globalconf.hooks.property = LUA_REFNIL;
globalconf.hooks.startup_notification = LUA_REFNIL;
globalconf.hooks.timer = LUA_REFNIL;
#ifdef WITH_DBUS
globalconf.hooks.dbus = LUA_REFNIL;
#endif
/* add Lua lib path (/usr/share/awesome/lib by default) */
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;
}
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 */
/* 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 */
}
lua_setfield(L, 1, "path"); /* package.path = "concatenated string" */
}
static bool
luaA_loadrc(const char *confpath, bool run)
{
if(!luaL_loadfile(globalconf.L, confpath))
{
if(run)
{
if(lua_pcall(globalconf.L, 0, LUA_MULTRET, 0))
fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
else
{
globalconf.conffile = a_strdup(confpath);
return true;
}
}
else
lua_pop(globalconf.L, 1);
return true;
}
else
fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
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;
}
void
luaA_on_timer(EV_P_ ev_timer *w, int revents)
{
if(globalconf.hooks.timer != LUA_REFNIL)
luaA_dofunction(globalconf.L, globalconf.hooks.timer, 0, 0);
awesome_refresh();
}
/** Push a color as a string onto the stack
* \param L The Lua VM state.
* \param c The color to push.
* \return The number of elements pushed on stack.
*/
int
luaA_pushxcolor(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];
int len;
/* do not print alpha if it's full */
if(a == 0xff)
len = snprintf(s, sizeof(s), "#%02x%02x%02x", r, g, b);
else
len = snprintf(s, sizeof(s), "#%02x%02x%02x%02x", r, g, b, a);
lua_pushlstring(L, s, len);
return 1;
}
/** Push a color as a string onto the stack
* \param L The Lua VM state.
* \param c The color to push.
* \return The number of elements pushed on stack.
*/
int
luaA_pushcolor(lua_State *L, const color_t *c)
{
uint8_t r = c->red;
uint8_t g = c->green;
uint8_t b = c->blue;
uint8_t a = c->alpha;
char s[10];
int len;
/* do not print alpha if it's full */
if(a == 0xff)
len = snprintf(s, sizeof(s), "#%02x%02x%02x", r, g, b);
else
len = snprintf(s, sizeof(s), "#%02x%02x%02x%02x", r, g, b, a);
lua_pushlstring(L, s, len);
return 1;
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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