optimize_indentation

# File railties/lib/rails/generators/actions.rb, line 326
        def optimize_indentation(value, amount = 0) # :doc:
          return "#{value}\n" unless value.is_a?(String)

          if value.lines.size > 1
            value.strip_heredoc.indent(amount)
          else
            "#{value.strip.indent(amount)}\n"
          end
        end