# File lib/sass/exec.rb, line 197
      def set_opts(opts)
        super

        opts.banner = "Usage: \#{default_syntax} [options] [INPUT] [OUTPUT]\n\nDescription:\n  Converts SCSS or Sass files to CSS.\n\nOptions:\n"

        if @default_syntax == :sass
          opts.on('--scss',
                  'Use the CSS-superset SCSS syntax.') do
            @options[:for_engine][:syntax] = :scss
          end
        else
          opts.on('--sass',
                  'Use the Indented syntax.') do
            @options[:for_engine][:syntax] = :sass
          end
        end
        opts.on('--watch', 'Watch files or directories for changes.',
                           'The location of the generated CSS can be set using a colon:',
                           "  #{@default_syntax} --watch input.#{@default_syntax}:output.css",
                           "  #{@default_syntax} --watch input-dir:output-dir") do
          @options[:watch] = true
        end
        opts.on('--update', 'Compile files or directories to CSS.',
                            'Locations are set like --watch.') do
          @options[:update] = true
        end
        opts.on('--stop-on-error', 'If a file fails to compile, exit immediately.',
                                   'Only meaningful for --watch and --update.') do
          @options[:stop_on_error] = true
        end
        opts.on('--poll', 'Check for file changes manually, rather than relying on the OS.',
                          'Only meaningful for --watch.') do
          @options[:poll] = true
        end
        opts.on('-f', '--force', 'Recompile all Sass files, even if the CSS file is newer.',
                                 'Only meaningful for --update.') do
          @options[:force] = true
        end
        opts.on('-c', '--check', "Just check syntax, don't evaluate.") do
          require 'stringio'
          @options[:check_syntax] = true
          @options[:output] = StringIO.new
        end
        opts.on('-t', '--style NAME',
                'Output style. Can be nested (default), compact, compressed, or expanded.') do |name|
          @options[:for_engine][:style] = name.to_sym
        end
        opts.on('--precision NUMBER_OF_DIGITS', Integer,
                'How many digits of precision to use when outputting decimal numbers. Defaults to 3.') do |precision|
          ::Sass::Script::Number.precision = precision
        end
        opts.on('-q', '--quiet', 'Silence warnings and status messages during compilation.') do
          @options[:for_engine][:quiet] = true
        end
        opts.on('--compass', 'Make Compass imports available and load project configuration.') do
          @options[:compass] = true
        end
        opts.on('-g', '--debug-info',
                'Emit extra information in the generated CSS that can be used by the FireSass Firebug plugin.') do
          @options[:for_engine][:debug_info] = true
        end
        opts.on('-l', '--line-numbers', '--line-comments',
                'Emit comments in the generated CSS indicating the corresponding source line.') do
          @options[:for_engine][:line_numbers] = true
        end
        opts.on('-i', '--interactive',
                'Run an interactive SassScript shell.') do
          @options[:interactive] = true
        end
        opts.on('-I', '--load-path PATH', 'Add a sass import path.') do |path|
          @options[:for_engine][:load_paths] << path
        end
        opts.on('-r', '--require LIB', 'Require a Ruby library before running Sass.') do |lib|
          require lib
        end
        opts.on('--cache-location PATH', 'The path to put cached Sass files. Defaults to .sass-cache.') do |loc|
          @options[:for_engine][:cache_location] = loc
        end
        opts.on('-C', '--no-cache', "Don't cache to sassc files.") do
          @options[:for_engine][:cache] = false
        end

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