# File lib/haml/exec.rb, line 666
      def set_opts(opts)
        opts.banner = "Usage: sass-convert [options] [INPUT] [OUTPUT]\n\nDescription:\n  Converts between CSS, Sass, and SCSS files.\n  E.g. converts from SCSS to Sass,\n  or converts from CSS to SCSS (adding appropriate nesting).\n\nOptions:\n"

        opts.on('-F', '--from FORMAT',
          'The format to convert from. Can be css, scss, sass, less, or sass2.',
          'sass2 is the same as sass, but updates more old syntax to new.',
          'By default, this is inferred from the input filename.',
          'If there is none, defaults to css.') do |name|
          @options[:from] = name.downcase.to_sym
          unless [:css, :scss, :sass, :less, :sass2].include?(@options[:from])
            raise "Unknown format for sass-convert --from: #{name}"
          end
          try_less_note if @options[:from] == :less
        end

        opts.on('-T', '--to FORMAT',
          'The format to convert to. Can be scss or sass.',
          'By default, this is inferred from the output filename.',
          'If there is none, defaults to sass.') do |name|
          @options[:to] = name.downcase.to_sym
          unless [:scss, :sass].include?(@options[:to])
            raise "Unknown format for sass-convert --to: #{name}"
          end
        end

        opts.on('-R', '--recursive',
          'Convert all the files in a directory. Requires --from and --to.') do
          @options[:recursive] = true
        end

        opts.on('-i', '--in-place',
          'Convert a file to its own syntax.',
          'This can be used to update some deprecated syntax.') do
          @options[:in_place] = true
        end

        opts.on('--dasherize', 'Convert underscores to dashes') do
          @options[:for_tree][:dasherize] = true
        end

        opts.on('--old', 'Output the old-style ":prop val" property syntax.',
                         'Only meaningful when generating Sass.') do
          @options[:for_tree][:old] = true
        end

        opts.on('-C', '--no-cache', "Don't cache to sassc files.") do
          @options[:for_engine][:read_cache] = false
        end

        unless ::Haml::Util.ruby1_8?
          opts.on('-E encoding', 'Specify the default encoding for Sass and CSS files.') do |encoding|
            Encoding.default_external = encoding
          end
        end

        super
      end