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An Erlang linked-in driver that allows embedding Lua into the Erlang VM
Erlang C
branch: master
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c_src Added a couple more Lua functions and also a simple higher level api …
ebin Initial commit
include Added a couple more Lua functions and also a simple higher level api …
src Added a couple more Lua functions and also a simple higher level api …
tests
.gitignore Initial commit
README.markdown Added more info to the README
Rakefile Lots of work on the basic low level driver

README.markdown

Erl-Lua is a library for embedding Lua into Erlang. It provides a simple interface that is very similar to the Lua C API. In the future it will also include a higher level API to simplify things further.

WARNING: This is definitely not fully tested. Still a bunch of work to be done. If you are careful though, it should be pretty stable (no promises though).

Example:

{ok, L} = lua:new_state().
lua:getfield(L, global, "print").
lua:pushstring(L, "Hello from Lua!").
lua:call(L, 1, 0).
% (Lua) => Hello from Lua!

lua:getfield(L, global, "type").
lua:pushnumber(L, 23).
lua:call(L, 1, 1).
{ok, S} = lua:tolstring(L, 1).
lua:remove(L, 1). % always rebalance the stack.. it is the right thing to do!
S. % => "number" 

For more examples, see the tests.

There is also a simple way to run one off simple Lua code snippets:

(continued from above)
lual:dostring(L, "print 'Howdy!'").
% (Lua) => Howdy!

NEW Higher Level API

call (lua_state L, (atom|string) function_name, list arguments, [int num_returned]) - Call a Lua function and return the values.

1> {ok, L} = lua:new_state().
2> lua_erl:call(L, type, [23], 1).
{"number"}
3> lual:dostring(L, "function add(a, b, c) return a + b + c end").
4> lua_erl:call(L, add, [2, 3, 4], 1).
{9}

The strange 4th arg is the number of values the function can return (since in Lua you can return multiple things). If the number of returned values is 1, the argument can be left off.. therefore both of the above could be rewritten:

lua_erl:call(L, type, [23]).
lua_erl:call(L, add, [2, 3, 4]).
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