INNER CODE UNIT · Ruby

self

busyloop/lolcat · lib/lolcat/lol.rb:36

  def self.rainbow(freq, i)
     red   = Math.sin(freq*i + 0) * 127 + 128
     green = Math.sin(freq*i + 2*Math::PI/3) * 127 + 128
     blue  = Math.sin(freq*i + 4*Math::PI/3) * 127 + 128
     "#%02X%02X%02X" % [ red, green, blue ]
  end

  def self.cat(fd, opts={})
    @os = opts[:os]
    print "\e[?25l" if opts[:animate]
    while true do
      buf = ''
      begin
        begin
          buf += fd.sysread(4096)
          invalid_encoding = !buf.dup.force_encoding(fd.external_encoding).valid_encoding?
        end while invalid_encoding or buf.match(INCOMPLETE_ESCAPE)
      rescue EOFError

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