-#!/bin/sh
-convert -compress none +distort SRT '0,0 1,.56 0' -thumbnail ${1:-66x23} - pgm:- |
-perl -e '
-<> eq "P2\n" or die "ascii pgm input required\n";
-<>; <>; # ignore depth, dimensions
+#!/usr/bin/perl
+use 5.014;
+my ($file, $size) = @ARGV;
+
+open my $pgm, '-|', convert => (
+ -compress => 'none',
+ '+distort' => SRT => '0,0 1,.56 0',
+ -thumbnail => $size || '66x23',
+ $file => 'pgm:-'
+) or die $!;
+<$pgm> eq "P2\n" or die "ascii pgm input required\n";
+<$pgm>; <$pgm>; # ignore depth, dimensions
my @ch = split //, " .:coO@";
-while (<>) {
+while (<$pgm>) {
print $ch[ $_ * @ch >> 8 ] for /\d+/g;
print $/;
}
-'