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def rgb(r, g, b)16+(r.to_i*36)+(g.to_i*6)+b.to_i end
def colorize(s, fg, bg = nil) "#{fg ? "\x1b[38;5;#{fg}m" : ''}#{bg ? "\x1b[48;5;#{bg}m" : ''}#{s}\x1b[0m" end
def rainbow(n)f,w,o=5.0/n,3,3; (0...n).map{|i| rgb(Math.sin(f*i+0)*o+w, Math.sin(f*i+2)*o+w, Math.sin(f*i+4)*o+w)} end
def display(board, goal=2048)
  @palette ||= rainbow(Math.log2(goal))
  puts board.map{|r| r.map{|c| colorize((c==0 ? ?. : c).to_s.center(6), @palette[Math.log2(c+1)])}.join}.join("\n\n")
end

def compress(board, direction)
  t=->(a){z=0;a.reduce([]){|s,e| z+=e==s[-1]? (s[-1]+=e;1): e>0? (s<<e;0): 1;s}+Array.new(z,0)} # trivial case: 1D array to the left

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#####################################################################################
#
#  Peer base
#
#####################################################################################

require 'socket'
require 'thread'
require 'ipaddr'
require 'json'

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require 'webrick'
require 'cgi'

class Busker
  def initialize(opts={}, &block)
    @routes = {}
    (block.arity < 1 ? instance_eval(&block) : block.call(self)) if block_given?
    opts[:Port] ||= opts.delete(:port) || 8080
    opts[:DocumentRoot] ||= opts.delete(:document_root) || File.expand_path('./')
    @server = WEBrick::HTTPServer.new(opts)

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require 'webrick'
require 'cgi'
require 'erb'

require 'em-websocket'

module EventMachine
  module WebSocket
    class Connection < EventMachine::Connection
      def remote_ip

pachacamac

Pump Hand Drill

http://www.thingiverse.com/thing:731086

Mecanum Wheels

http://www.thingiverse.com/thing:436751

pachacamac

require 'digest/sha2'
require 'securerandom'
require 'time'

def random_seed
  Digest::SHA512.hexdigest(SecureRandom.random_bytes(64))
end

def timekey(rounds, seed = random_seed)
  # see also: http://www.gwern.net/Self-decrypting%20files

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/*tinyMd based on https://github.com/SimonWaldherr/micromarkdown.js*/
var tinyMd = {
  regexobject: {
    headline: /^(\#{1,6})([^\#\n]+)$/m,
    code: /\s\`\`\`\n?([^`]+)\`\`\`/g,
    hr: /^(?:([\*\-_] ?)+)\1\1$/gm,
    lists: /^((\s*((\*|\-)|\d(\.|\))) [^\n]+)\n)+/gm,
    bolditalic: /(?:([\*_~]{1,3}))([^\*_~\n]+[^\*_~\s])\1/g,
    links: /!?\[([^\]<>]+)\]\(([^ \)<>]+)( "[^\(\)\"]+")?\)/g,
    reflinks: /\[([^\]]+)\]\[([^\]]+)\]/g,

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require 'digest/md5'

# def color_hash(str, opts={})
#   ranges = opts[:ranges] || [(64..190),(64..190),(64..190)]
#   factors = opts[:factors] || [1.0] * ranges.size
#   factors = [factors.to_f] * ranges.size unless factors.is_a?(Array)
#   str.bytes.reduce(ranges.each_with_index.map{|e,i| e.size/(i+1)}){ |s,e|
#     s.each_with_index.map{|x,i|(x*e)%ranges[i].size+ranges[i].first}
#   }.each_with_index.map{|e,i|
#     x = (e*factors[i]).to_i

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begin
  require 'oily_png'
rescue LoadError
  STDERR.puts 'Warning: Gem oily_png not found. Using chunky_png instead. This will be slow!'
  require 'chunky_png'
end

def load_image(file)
  ChunkyPNG::Image.from_file(file)
rescue ChunkyPNG::SignatureMismatch

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<?php
$files = preg_grep('/\.jpg$/i', glob('*'));
if($_GET['thumb'] && in_array($_GET['thumb'], $files)){
  $thumb = exif_thumbnail($_GET['thumb'], $width, $height, $type);
  if($thumb !== false){ // show embedded thumbnail
    header('Content-type: '.image_type_to_mime_type($type));
    echo $thumb;
  }elseif(false){
    // TODO: create thumbnail on the fly with imagemagick if installed
  }else{ // fallback: show original image