source: trunk/tools/shorten-filenames.pl @ 1171

#!/usr/bin/perl
use strict;

my $n;

sub process_dir($) {
        my ($d) = @_;
        opendir my $h, $d or die "$d: $!\n";
        my @e = sort grep !/^\./, readdir $h;
        closedir $h;
        my %h;
        if (@e > 64) {
                printf "%s: %d entries\n", $d, scalar @e;
        }
        for my $e (@e) {
                my $l = "$d/$e";
                my $s = uc $e;
                $s =~ y/-_//d;
                my ($f, $x) = $s =~ /^([0-9A-Z]+)(\.[0-9A-Z]{1,3})?$/ or die "$l: illegal filename\n";
                $f = substr($f, 0, $n);
                my $c = 1;
                while ($h{$f.$x}++) {
                        ++$c;
                        $f = substr($f, 0, $n - length($c)) . $c;
                }
                printf "%-*s%-5s%s\n", $n, $f, $x, $l;
                if (-d $l) {
                        process_dir($l);
                }
        }
}

if (@ARGV != 2 || $ARGV[0] !~ /^\d\d?$/) {
        die "Usage: perl shorten-filenames.pl NUMCHARS DIR\n";
}
$n = $ARGV[0];
process_dir($ARGV[1]);