#!/usr/bin/env slsh
% Find links that point to non-existent files

static define warn ()
{
   variable args = __pop_args (_NARGS-1);
   variable err = ();
   variable msg;

   msg = sprintf (__push_args (args));

   if (err)
     err = ": " + errno_string (err);
   else
     err == "";

   () = fprintf (stderr, "%s: %s%s\n",
		 __argv[0], msg, err);
}

static define badlinks (dir)
{
   variable files, file;
   variable st;

   files = listdir (dir);
   if (files == NULL)
     {
	warn (errno, dir);
	return;
     }

   foreach (files)
     {
	file = ();

	file = path_concat (dir, file);
	st = stat_file (file);
	if (st != NULL)
	  continue;

	if (errno != ENOENT)
	  {
	     warn (errno, file);
	     continue;
	  }

	if (-1 == fprintf (stdout, "%s\n", file))
	  break;
     }
}

define main (argc, argv)
{
   if (argc > 1)
     {
	if (argv[1] == "--help")
	  {
	     () = fprintf (stdout, "Usage: %s [--help] [dirs....]\n",
			   __argv[0]);
	     exit (1);
	  }
     }

   if (argc == 1)
     {
	badlinks (".");
	exit (0);
     }

   foreach (argv[[1:]])
     badlinks ();

   exit (0);
}

main (__argc, __argv);