apeiros

module Lib
  def has_color
    define_method(:color) do 'red' end
  end
end

class Car
  extend Lib
  has_color
end

apeiros

class String
  def segments
    segments = split(/\./)
    while segments.size > 1
      yield(segments.join('.'))
      segments.pop
    end
    yield('.')
  end
end

apeiros

#!/usr/bin/env ruby

# hackery to simulate a file
require 'stringio'
RealFile = File
Object.send(:remove_const, :File)
File = StringIO
def StringIO.open(data); x=new(data);x.rewind; x; end
# end of hackery

apeiros

class String
  def reindent(to, tabwidth=nil)
    indenter = (tabwidth ? " "*tabwidth : "\t")*to
    initial  = self[/\A[\t ]*/]
    gsub(/^(?:#{initial})?/, indenter)
  end
end

apeiros

$ ruby cgi.rb 
(offline mode: enter name=value pairs on standard input)
sprache=java
Content-Type: text/html
Content-Length: 14

code ist java

apeiros

/*
    $Id: strscan.c 11708 2007-02-12 23:01:19Z shyouhei $

    Copyright (c) 1999-2006 Minero Aoki

    This program is free software.
    You can distribute/modify this program under the terms of
    the Ruby License. For details, see the file COPYING.
*/

apeiros

# include time matters
module CallInspectable
  def self.included(by)
    inherited_methods = by.public_instance_methods-by.public_instance_methods(false)
    inherited_methods.sort.each { |name|
      class_eval("def #{name}(*args); $stderr.puts \"Called '#{name}' in #{by}\"; super; end")
    }
  end
end

apeiros

module CallInspectable
  def intercept_all_calls(&block)
    all_methods = superclass.public_instance_methods
    m = Module.new do
      all_methods.each { |method_name|
        define_method(method_name) do |*args|
          block.call(method_name)
          super
        end
      }

apeiros

SELECT cv.* FROM candidate_versions AS cv JOIN (
  SELECT lower_bound.candidate_id, MIN(lower_bound.updated_at) AS lower_updated_at, MAX(upper_bound.updated_at) AS upper_updated_at FROM (
    SELECT MAX(updated_at) as updated_at, candidate_id FROM candidate_versions WHERE updated_at <= '2009-01-01' GROUP BY candidate_id
    UNION ALL
    SELECT MIN(updated_at) as updated_at, candidate_id FROM candidate_versions WHERE updated_at BETWEEN '2009-01-01' AND '2010-01-01' GROUP BY candidate_id
  ) AS lower_bound JOIN (
    SELECT MAX(updated_at) as updated_at, candidate_id FROM candidate_versions WHERE updated_at <= '2010-01-01' GROUP BY candidate_id
  ) AS upper_bound ON lower_bound.candidate_id=upper_bound.candidate_id
    WHERE lower_bound.candidate_id < 10020
    GROUP BY lower_bound.candidate_id

apeiros

#!/usr/bin/env ruby

require 'optparse'

utf8   = true
colors = false

opts = OptionParser.new("", 24, '  ') do |opts|
  opts.banner = "Usage: #{$PROGRAM_NAME} [options] [directory]"