Download and show image in terminal (iterm2 only)

iccat.sh

#!/bin/bash

function print_image() {
  printf "\033]"
  printf "1337;File="
  echo -n "$1" | base64 -D | wc -c | awk '{printf "size=%d",$1}'
  printf ";inline=1:"
  echo -n "$1"
  printf "\a\n"
}

re='(https?)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]\.(png|jpg|gif|jpeg)'
if [[ $1 =~ $re ]]
  then
    print_image "$(curl -vs "$1" 2>/dev/null | base64)"
    exit 0
  else
    exit 1
fi

INTEGRATION

IRSSI

#!/usr/bin/perl -w
use strict;
use Irssi;
use vars qw($VERSION %IRSSI);
$VERSION = "0.2";
%IRSSI = (
  authors     => 'Paolo Fragomeni',
  contact     => 'paolo@async.ly',
  name        => 'images',
  description => 'replace image urls with actual images inline.',
  license     => 'MIT',
  url         => '/',
);

my $lasturl;

sub listen_image_urls {
  my($server, $text, $nick, $address, $channel)=@_;
  my $url = find_url($text);
  rewrite($text, $nick, $address, $channel, $url) if defined $url;
}

sub find_url {
  my $text = shift;
  if ($text =~ /((https?):\/\/[a-zA-Z0-9\/\\\:\?\%\.\&\;=#\-\_\!\+\~]*)\.(png|jpg|gif|jpeg)/i) {
    return $1;
  }
  return undef;
}

sub rewrite {
  my($text, $nick, $address, $channel, $url) = @_;
  return if lc $url eq lc $lasturl;
  my ($target, $msg) = split(/ :/, $text, 2);

  my $replacement = `iccat.sh $url`;
  Irssi::signal_emit('event privmsg', ($server, "$target :$replacement", $nick, $address));
  Irssi::signal_stop();
}

Irssi::signal_add("event privmsg", "listen_image_urls");

I'm sorry, I'm trying to figure out where i'd put this and how i'd run this.