source_extract

# File actionview/lib/action_view/template/error.rb, line 84
      def source_extract(indentation = 0, output = :console)
        return unless num = line_number
        num = num.to_i

        source_code = @template.source.split("\n")

        start_on_line = [ num - SOURCE_CODE_RADIUS - 1, 0 ].max
        end_on_line   = [ num + SOURCE_CODE_RADIUS - 1, source_code.length].min

        indent = end_on_line.to_s.size + indentation
        return unless source_code = source_code[start_on_line..end_on_line]

        formatted_code_for(source_code, start_on_line, indent, output)
      end