module Templater::CaptureHelpers

def _erb_buffer( the_binding )
  @_buffer = eval( "_erbout", the_binding, __FILE__, __LINE__)
end

def capture(*args, &block)
  # get the buffer from the block's binding
  buffer = _erb_buffer( block.binding ) rescue nil
  # If there is no buffer, just call the block and get the contents
  if buffer.nil?
    block.call(*args)
  # If there is a buffer, execute the block, then extract its contents
  else
    pos = buffer.length
    block.call(*args)
    # extract the block
    data = buffer[pos..-1]
    # replace it in the original with empty string
    buffer[pos..-1] = ''
    data
  end
end

def concat(string, binding)
  _erb_buffer(binding) << string
end