#!/usr/local/bin/ruby -w

abort "#{File.basename $0} max_length files..." unless ARGV.size > 1

require 'rubygems'
require 'image_science'

max_length = ARGV.shift.to_i

ARGV.each do |file|
  begin
    result = ImageScience.with_image file do |img|
      begin
        img.thumbnail(max_length) do |thumb|
          # add _thumb and switch from gif to png. Really. gif just sucks.
          out = file.sub(/(\.[^\.]+)$/, '_thumb\1').sub(/gif$/, 'png')
          thumb.save(out)
        end
      rescue => e
        warn "Exception thumbnailing #{file}: #{e}"
      end
    end
    p file => result
  rescue => e
    warn "Exception opening #{file}: #{e}"
  end
end