This is lua, a sample Lua interpreter.
It can be used as a batch interpreter and also interactively.
There are man pages for it in both nroff and html in ../../doc.

Here are the options that lua understands:
  -        execute stdin as a file
  -c       close Lua when exiting
  -e stat  execute string `stat'
  -f name  execute file `name' with remaining arguments in table `arg'
  -i       enter interactive mode with prompt
  -q       enter interactive mode without prompt
  -sNUM    set stack size to NUM (must be the first option)
  -v       print version information
  a=b      set global `a' to string `b'
  name     execute file `name'

If no options are given, then it reads lines from stdin and executes them
as they are read -- so, each line must contain a complete statement.
To span a statement across several lines, end each line with a backslash '\'.

To change the prompt, set the global variable _PROMPT to whatever you want.
You can do this after calling the interpreter or on the command line with
	lua _PROMPT="lua: " -i
for example. Note that you need "-i" in this case.

You must be careful when using quotes on the command line because they are
usually handled by the shell.

This interpreter is suitable for using Lua as a standalone language; it loads
all standard libraries. For a minimal interpreter, see ../../etc/min.c.

If your application simply exports new functions to Lua (which is common),
then you can use this interpreter (almost) unmodified, as follows:
First, define a function 
	void myinit (lua_State *L)
in your own code. In this function, you should do whatever initializations
are needed by your application, typically exporting your functions to Lua.
(Of course, you can use any name instead of "myinit".)

Then, #define LUA_USERINIT(L) to be "openstdlibs(L);myinit(L)".
Here, openstdlibs is a function in lua.c that opens all standard libraries.
If you don't need them, just don't call openstdlibs and open any standard
libraries that you do need in myinit.

Finally, remember to link your C code when building lua.
