update any repositories.

update.rb

#!/usr/bin/env ruby
# -*- coding:utf-8 -*-

require 'pathname'

module VCSCommand
  @@vcs_update_table = {
    '.git' => 'git pull',
    '.hg' => 'hg pull -u',
    '.svn' => 'svn up',
    '.bzr' => 'bzr up',
  }

  def repository?
    self.directory? && metadata?
  end

  def metadata?
    @@vcs_update_table.has_key?(File.basename(self))
  end

  def update
    Dir::chdir(File.dirname(File.expand_path(self))) {
      puts "UPDATE #{Pathname::pwd()}"
      system(update_comamnd())
    }
  end

  def update_comamnd
    @@vcs_update_table[File.basename(self)]
  end
end

class Pathname; include VCSCommand; end


dir = ARGV.shift || '.'
Pathname.new(dir).each_child.select {|file| file.repository? }.
                  each {|repository| repository.update }