wtf.rb

    def detect(path)
      git = File.directory?(File.join(path, '.git'))
      svn = File.directory?(File.join(path, '.svn'))
      hg = File.directory?(File.join(path, '.hg'))
      bzr = File.directory?(File.join(path, '.bzr'))
 
      case [git, svn, hg, bzr]
      when [true, false, false, false] then SourceControl::Git.new(:path => path)
      when [false, true, false, false] then SourceControl::Subversion.new(:path => path)
      when [false, false, true, false] then SourceControl::Mercurial.new(:path => path)
      when [false, false, false, true] then SourceControl::Bazaar.new(:path => path)
      when [false, false, false, false] then raise "Could not detect the type of source control in #{path}"
      else raise "More than one type of source control was detected in #{path}"
      end
    end