def complex_template(relative_source, relative_destination, template_options = {})
begin
dest_file = destination_path(relative_destination)
source_to_update = File.readlines(dest_file).join
rescue Errno::ENOENT
logger.missing relative_destination
return
end
logger.refreshing "#{template_options[:insert].gsub(/\.erb/,'')} inside #{relative_destination}"
begin_mark = Regexp.quote(template_part_mark(template_options[:begin_mark], template_options[:mark_id]))
end_mark = Regexp.quote(template_part_mark(template_options[:end_mark], template_options[:mark_id]))
rendered_part = render_template_part(template_options)
source_to_update.gsub!(/#{begin_mark}.*?#{end_mark}/m, rendered_part)
File.open(dest_file, 'w') { |file| file.write(source_to_update) }
end