class Thor::Shell::Basic

def file_collision(destination)


block:: an optional block that returns the value to be used in diff
destination:: the destination file to solve conflicts
==== Parameters

response as the content for the diff.
overwriten and false otherwise. If a block is given, it uses the block
Deals with file collision and returns true if the file should be 
def file_collision(destination)
  return true if @always_force
  options = block_given? ? "[Ynaqdh]" : "[Ynaqh]"
  while true
    answer = ask %[Overwrite #{destination}? (enter "h" for help) #{options}]
    case answer
      when is?(:yes), is?(:force), ""
        return true
      when is?(:no), is?(:skip)
        return false
      when is?(:always)
        return @always_force = true
      when is?(:quit)
        say 'Aborting...'
        raise SystemExit
      when is?(:diff)
        show_diff(destination, yield) if block_given?
        say 'Retrying...'
      else
        say file_collision_help
    end
  end
end