#!/usr/bin/perl -w
##################################################
#
# NotSoLong.pl - by ichimunki
#
# hereby released into Public Domain
# use at your own risk! tested on Linux only.
#
# usage: 'notsolong.pl [directory|filename]
# if no argument will use current directory
#
# purpose: recurse through a directory tree
# shortening both filenames and directory names
# to be 31 characters or less, so that they are
# visible via AppleTalk to Macs running pre-OS X
# versions of Mac OS.
#
# will normally just clip the name, but does 
# check to make sure the new, shorter name isn't
# already in use. if so, appends numbers until
# it gets a unique name.
#
# does not handle .paths at all, as these are 
# normally invisible to Mac OS
#
##################################################
use strict;
use File::Copy;
use File::Basename;
use File::Find;

@ARGV = ('.') unless @ARGV;

finddepth sub 
{
  if( ( length > 31 ) && -d && !/^\./ )
  {
    print "D: $_\n";
    my $short_name = substr( $_, 0, 31 );
    print "d: $short_name\n";
    change_name( $_, $short_name );
  }
  if( ( length > 31 ) && !-d && !/^\./ )
  {
    print "F: $_\n";
    my ($ext) = /.+?(\..+?)$/;
    my $short_name = substr( $_, 0, 31 - length($ext) ) . $ext;
    print "f: $short_name\n";
    change_name( $_, $short_name, $ext );
  }
}, @ARGV;

exit;

sub change_name
{
  my $old = shift or
    die "No too long name: $!";
  my $new = shift or
    die "No short enough name: $!";
  my $ext = shift || undef;

  my $counter = 1;

  while( stat( $new ) )
  {
    $counter++;
    if( $ext ) #this is a file
    {
      $new = substr( $new, 0, 31 - length($counter) - length($ext) ) .
      $counter . 
      $ext;
    }
    else #this is a directory handle
    {
      $new = substr( $new, 0, 31 - length($counter) ) . $counter;
    }
  }
  print "X: $new\n";
  move( $old, $new );
}