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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 Dan Everton (safetydan)
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "rocklib.h"
#include "rocklib_img.h"
#include "luadir.h"
#include "rocklib_events.h"
static lua_State *Ls = NULL;
static int lu_status = 0;
static const luaL_Reg lualibs[] = {
{"", luaopen_base},
{LUA_LOADLIBNAME, luaopen_package},
{LUA_TABLIBNAME, luaopen_table},
{LUA_STRLIBNAME, luaopen_string},
{LUA_BITLIBNAME, luaopen_bit},
{LUA_IOLIBNAME, luaopen_io},
{LUA_MATHLIBNAME, luaopen_math},
{LUA_OSLIBNAME, luaopen_os},
{LUA_ROCKLIBNAME, luaopen_rock},
{LUA_ROCKLIBNAME, luaopen_rock_img},
{LUA_ROCKEVENTSNAME, luaopen_rockevents},
{LUA_DIRLIBNAME, luaopen_luadir},
{NULL, NULL}
};
static void rocklua_openlibs(lua_State *L) {
const luaL_Reg *lib = lualibs;
for (; lib->func; lib++) {
lua_pushcfunction(L, lib->func);
lua_pushstring(L, lib->name);
lua_call(L, 1, 0);
}
}
/* ldlib.c */
static lua_State *getthread (lua_State *L, int *arg) {
if (lua_isthread(L, 1)) {
*arg = 1;
return lua_tothread(L, 1);
}
else {
*arg = 0;
return L;
}
}
#define LEVELS1 12 /* size of the first part of the stack */
#define LEVELS2 10 /* size of the second part of the stack */
static int db_errorfb (lua_State *L) {
int level;
int firstpart = 1; /* still before eventual `...' */
int arg;
lua_State *L1 = getthread(L, &arg);
lua_Debug ar;
if (lua_isnumber(L, arg+2)) {
level = (int)lua_tointeger(L, arg+2);
lua_pop(L, 1);
}
else
level = (L == L1) ? 1 : 0; /* level 0 may be this own function */
if (lua_gettop(L) == arg)
lua_pushliteral(L, "");
else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */
else lua_pushliteral(L, "\n");
lua_pushliteral(L, "stack traceback:");
while (lua_getstack(L1, level++, &ar)) {
if (level > LEVELS1 && firstpart) {
/* no more than `LEVELS2' more levels? */
if (!lua_getstack(L1, level+LEVELS2, &ar))
level--; /* keep going */
else {
lua_pushliteral(L, "\n\t..."); /* too many levels */
while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */
level++;
}
firstpart = 0;
continue;
}
lua_pushliteral(L, "\n\t");
lua_getinfo(L1, "Snl", &ar);
lua_pushfstring(L, "%s:", ar.short_src);
if (ar.currentline > 0)
lua_pushfstring(L, "%d:", ar.currentline);
if (*ar.namewhat != '\0') /* is there a name? */
lua_pushfstring(L, " in function " LUA_QS, ar.name);
else {
if (*ar.what == 'm') /* main? */
lua_pushfstring(L, " in main chunk");
else if (*ar.what == 'C' || *ar.what == 't')
lua_pushliteral(L, " ?"); /* C function or tail call */
else
lua_pushfstring(L, " in function <%s:%d>",
ar.short_src, ar.linedefined);
}
lua_concat(L, lua_gettop(L) - arg);
}
lua_concat(L, lua_gettop(L) - arg);
return 1;
}
/* lua.c */
static int traceback (lua_State *L) {
lua_pushcfunction(L, db_errorfb);
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
static int docall (lua_State *L) {
int status;
int base = lua_gettop(L); /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
status = lua_pcall(L, 0, 0, base);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static void lua_atexit(void);
static int loadfile_newstate(lua_State **L, const char *filename)
{
*L = luaL_newstate();
rb_atexit(lua_atexit);
rocklua_openlibs(*L);
return luaL_loadfile(*L, filename);
}
static void lua_atexit(void)
{
char *filename;
if(Ls && lua_gettop(Ls) > 1)
{
if (Ls == lua_touserdata(Ls, -1)) /* signal from restart_lua */
{
filename = (char *) malloc(MAX_PATH);
if (filename) /* out of memory? */
rb->strlcpy(filename, lua_tostring(Ls, -2), MAX_PATH);
lua_close(Ls); /* close old state */
lu_status = loadfile_newstate(&Ls, filename);
free(filename);
plugin_start(NULL);
}
else if (lua_tointeger(Ls, -1) != 0) /* os.exit */
{
lu_status = LUA_ERRRUN;
lua_pop(Ls, 1); /* put exit string on top of stack */
plugin_start(NULL);
}
}
_exit(0); /* don't call exit handler */
}
/***************** Plugin Entry Point *****************/
enum plugin_status plugin_start(const void* parameter)
{
const char* filename;
if (parameter == NULL)
{
if (!Ls)
rb->splash(HZ, "Play a .lua file!");
}
else
{
filename = (char*) parameter;
lu_status = loadfile_newstate(&Ls, filename);
}
if (Ls)
{
if (!lu_status) {
rb->lcd_scroll_stop(); /* rb doesn't like bg change while scroll */
rb->lcd_clear_display();
lu_status= docall(Ls);
}
if (lu_status) {
DEBUGF("%s\n", lua_tostring(Ls, -1));
rb->splash(5 * HZ, lua_tostring(Ls, -1));
/*lua_pop(Ls, 1);*/
}
lua_close(Ls);
}
else
return PLUGIN_ERROR;
return PLUGIN_OK;
}
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