# File erubis/main.rb, line 40
    def self.main(argv=ARGV)
      status = 0
      begin
        Main.new.execute(ARGV)
      rescue CommandOptionError => ex
        $stderr.puts ex.message
        status = 1
      end
      exit(status)
    end

# File erubis/main.rb, line 51
    def initialize
      @single_options = "hvxztTSbeBXNUC"
      @arg_options    = "pcrfKIlaE" #C
      @option_names   = {
        ?h => :help,
        ?v => :version,
        ?x => :source,
        ?z => :syntax,
        ?T => :unexpand,
        ?t => :untabify,      # obsolete
        ?S => :intern,
        ?b => :bodyonly,
        ?B => :binding,
        ?p => :pattern,
        ?c => :context,
        #?C => :class,
        ?e => :escape,
        ?r => :requires,
        ?f => :datafiles,
        ?K => :kanji,
        ?I => :includes,
        ?l => :lang,
        ?a => :action,
        ?E => :enhancers,
        ?X => :notext,
        ?N => :linenum,
        ?U => :unique,
        ?C => :compact,
      }
      assert unless @single_options.length + @arg_options.length == @option_names.length
      (@single_options + @arg_options).each_byte do |ch|
        assert unless @option_names.key?(ch)
      end
    end

# File erubis/main.rb, line 87
    def execute(argv=ARGV)
      ## parse command-line options
      options, properties = parse_argv(argv, @single_options, @arg_options)
      filenames = argv
      options[?h] = true if properties[:help]
      opts = Object.new
      arr = @option_names.collect { |ch, name| "def #{name}; @#{name}; end\n" }
      opts.instance_eval arr.join
      options.each do |ch, val|
        name = @option_names[ch]
        opts.instance_variable_set("@#{name}", val)
      end

      ## help, version, enhancer list
      if opts.help || opts.version
        puts version()         if opts.version
        puts usage()           if opts.help
        puts show_properties() if opts.help
        puts show_enhancers()  if opts.help
        return
      end

      ## include path
      opts.includes.split(/,/).each do |path|
        $: << path
      end if opts.includes

      ## require library
      opts.requires.split(/,/).each do |library|
        require library
      end if opts.requires

      ## action
      action = opts.action
      action ||= 'syntax'  if opts.syntax
      action ||= 'convert' if opts.source || opts.notext

      ## lang
      lang = opts.lang || 'ruby'
      action ||= 'convert' if opts.lang

      ## class name of Eruby
      #classname = opts.class
      classname = nil
      klass = get_classobj(classname, lang, properties[:pi])

      ## kanji code
      $KCODE = opts.kanji if opts.kanji

      ## read context values from yaml file
      datafiles = opts.datafiles
      context = load_datafiles(datafiles, opts)

      ## parse context data
      if opts.context
        context = parse_context_data(opts.context, opts)
      end

      ## properties for engine
      properties[:escape]   = true         if opts.escape && !properties.key?(:escape)
      properties[:pattern]  = opts.pattern if opts.pattern
      #properties[:trim]     = false        if opts.notrim
      properties[:preamble] = properties[:postamble] = false if opts.bodyonly
      properties[:pi]       = nil          if properties[:pi] == true

      ## create engine and extend enhancers
      engine = klass.new(nil, properties)
      enhancers = get_enhancers(opts.enhancers)
      #enhancers.push(Erubis::EscapeEnhancer) if opts.escape
      enhancers.each do |enhancer|
        engine.extend(enhancer)
        engine.bipattern = properties[:bipattern] if enhancer == Erubis::BiPatternEnhancer
      end

      ## no-text
      engine.extend(Erubis::NoTextEnhancer) if opts.notext

      ## convert and execute
      val = nil
      msg = "Syntax OK\n"
      if filenames && !filenames.empty?
        filenames.each do |filename|
          test(?f, filename)  or raise CommandOptionError.new("#{filename}: file not found.")
          engine.filename = filename
          engine.convert!(File.read(filename))
          val = do_action(action, engine, context, filename, opts)
          msg = nil if val
        end
      else
        engine.filename = filename = '(stdin)'
        engine.convert!($stdin.read())
        val = do_action(action, engine, context, filename, opts)
        msg = nil if val
      end
      print msg if action == 'syntax' && msg

    end