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/**
* @description    DropDownAnything, drop down menu based on prototype
* @author Leandro N. Camargo; leandro-at-gmail-dot-com
* @version 0.1
* @date 08/09/2008
* @requires prototype.js 1.6
*/
 
var DDropDown = function(menu, targets, opt) {
  var null_fn = function() {}, _this = this, ie = Prototype.Browser.IE, select_callback = false, menu_caller;

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module RIndexer
  RE_TAG = %r!<([a-z\d_-]+)\s*.*?>!im

  def fetch_tags(doc_stream)
    tags = Hash.new(0)
    doc_stream.scan(RE_TAG).each do |e|
      tags[e] += 1
    end
    tags
  end

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module RIndexer
  RE_TAG = %r!<([a-z\d_-]+)\s*.*?>!im

  def fetch_tags(doc_stream)
    tags = Hash.new(0)
    doc_stream.scan(RE_TAG).each do |e|
      tags[e] += 1
    end
    tags
  end

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class String
  def /(separator)
    split separator
  end
end

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class Object

  # with this method you can call stuffs like this Comment.nested_send(:creator, :login)
  # it's the same of Comment.creator.login without the need of checking the absense of creator like:
  # Comment.creator && Comment.creator.login
  def nested_send(*methods)
    obj = self
    methods.each do |e|
      case e
        when Array

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class Object

  # with this method you can call stuffs like this Comment.nested_send(:creator, :login)
  # it's the same of Comment.creator.login without the need of checking the absense of creator like:
  # Comment.creator && Comment.creator.login
  def nested_send(*methods)
    obj = self
    methods.each do |e|
      case e
        when Array

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require 'matrix'

module FixnumExt
  def square?
    sqrt = self ** (1.0/2)
    (sqrt - sqrt.to_i).zero?
  end
end

module MatrixDeterminant

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# Matrix#det2 does what Matrix#det doesn't do: calculate correctly a matrix determinant
require 'matrix'

module FixnumExt
  def square?
    sqrt = self ** (1.0/2)
    (sqrt - sqrt.to_i).zero?
  end
end

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# collect information about a running process
# ruby debug.rb <pid>

begin
  raise ArgumentError unless pid = ARGV[0]
  pid = pid.to_i
  Process.kill(0,pid)
rescue TypeError, ArgumentError
  raise 'pid required'
rescue Errno::ESRCH

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Vim

autocmd BufWritePre * :%s/\s\+$//e

Emacs

(add-hook 'before-save-hook 'delete-trailing-whitespace)

Textmate