module BuildMaster
class PhysicalSystem
  def initialize
  end

  # Invoke the command passed in through the CommandRunner
  # and pass in the closure.
  def shell(command, &block)
    runner = CommandRunner.new(command)
    runner.execute(&block)
  end
  
  def environment!(variable)
    value = ENV[variable]
    raise "#{variable} environment variable not found" unless value
    return value
  end
  
  def environment(variable, default)
    value = ENV[variable]
    value = default unless value
    return value
  end
  
  def dir_exists?(dir_path)
    return FileTest.directory?(dir_path)
  end
  
  def file_exists?(file_path)
    return FileTest.file?(file_path)
  end
  
  def dir_stat(path)
    File.stat(path)
  end
  
  def file_stat(path)
    File.stat(path)
  end
  
  def list(dir_path)
    Dir.entries(dir_path).find_all {|item| item != '.' && item != '..'}
  end
  
  def mkdir(dir_path)
    Dir.mkdir(dir_path)
  end
  
  def io(file_path, argument)
    return File.open(file_path, argument)
  end
  
  def delete_file(file_path)
    return File.delete(file_path)
  end
  
  def delete_dir(dir_path)
    return Dir.delete(dir_path)
  end
  
  def copy_file(source, target)
    FileUtils.copy(source, target)
  end
  
  def move_file(source, target)
    FileUtils.move(source, target)
  end
  
  def copy_dir(source, target)
    FileUtils.copy_entry(source, target)
  end
  
  def move_dir(source, target)
    FileUtils.mv(source, target)
  end
  
  def chdir(target, &block)
    Dir.chdir(target, &block)
  end
  
  def pwd
    Dir.pwd  
  end

  def ==(other)
    other.class == PhysicalSystem
  end
end
end