BSDLUA [FreeBSD WIKI]

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The BSDCan 2011 slides on BSDLUA are here: {{ivanvoras/bsdlua/bsdlua.pdf?linkonly|bsdlua.pdf}} and also here: http://people.freebsd.org/~ivoras/slides/bsdlua2011.pdf .

The current (may be temporary) Mercurial (hg) repository for BSDLUA is available at http://cosmos.boldlygoingnowhere.org:81/~ivoras/hg/bsdlua .

You can make a local clone of the repository with:

<code>
hg clone http://cosmos.boldlygoingnowhere.org:81/~ivoras/hg/bsdlua
</code>

Please send patches via ''%%hg export%%''!

===== Tutorial for embedders =====

Please read the following documentation:

  * http://www.lua.org/ - The main Lua site
  * http://pgl.yoyo.org/luai/i/3.7+Functions+and+Types - C functions and types used to access Lua from C
  * http://www.lua.org/manual/5.1/#index - all else on Lua
  * http://lua-users.org/wiki/LuaDirectory - some Lua Wiki resources
  * http://www.codeproject.com/KB/cpp/luaincpp.aspx - Another tutorial on embedding

The newest version of this script is committed in the BSDLUA hg repository in the ''%%bsdlua/tests/scripting%%'' directory.

An example program (note that this program and its Makefile require that the BSDLUA is installed, i.e. that the ''%%make install%%'' target was executed):

<code>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>

#include <bsdlua.h>
#include <bsdlauxlib.h>

lua_State *L;

static int
greeting(lua_State *L)
{
        /* This function accepts one string argument and returns no values */
        int nargs = lua_gettop(L);
        const char *arg;

        assert(nargs == 1);
        arg = lua_tostring(L, 1);
        printf("Hello from C: %s\n", arg);

        /* lua_pushstring(L, "blah blah blah"); */
        /* if the above line were uncommented, the function would return "1" */
        return 0;
}

int
main()
{
        L = lua_open();
        luaL_openlibs(L);

        luaL_dostring(L, "print(\"Hello from lua\")");

        lua_register(L, "greeting", greeting);
        luaL_dostring(L, "greeting(\"cromulent\")");

        /* Call BSDLUA */
        luaL_dostring(L, "print(\"My PID is: \" .. posix.getpid())");
}
</code>

Makefile:

<code>
all: luainc

clean:
        rm -f *.o *.core luainc

luainc: luainc.o
        gcc -o luainc luainc.o -lbsdlua -lm -lcurses -lpanel

luainc.o: luainc.c
        gcc -O2 -o luainc.o -c luainc.c
</code>