Re: lua.c & path setup

[David Given <dg@...>]

On Tuesday 30 November 2004 16:05, Roberto Ierusalimschy wrote:
> > Does anyone know why the lua.c command line interpreter is set up
> > to call do_path (which sets up the plugin loading paths) *after* it
> > executes the script you tell it to?
>
> What do you mean by "do_path"?

There's a static function called do_path() in lua.c whose job is to initialise 
the LUA_PATH global variable. It's called from a number of places. pmain(), 
which is the main part of the program, does this:

static int pmain (lua_State *l) {
[...]
  lua_userinit(l);  /* open libraries */
  status = handle_luainit();
  if (status == 0) {
    status = handle_argv(s->argv, &interactive);
    do_path();
    if (status == 0 && interactive) manual_input();
  }
[...]
  return 0;
}

handle_luainit() is the routine that looks at the LUA_INIT environment 
variable and runs the script named there.

So, the order of things is: register the hard-coded libraries; run LUA_INIT; 
run any scripts on the command line; set up LUA_PATH; enter interactive mode. 
This seems strange. I'd have expected do_path() to go right up the top, 
before LUA_INIT.

-- 
+- David Given --McQ-+ "What appears to be a sloppy or meaningless use of
|  dg@cowlark.com    | words may well be a completely correct use of words
| (dg@tao-group.com) | to express sloppy or meaningless ideas." ---
+- www.cowlark.com --+ Anonymous Diplomat