parse

# File lib/rdoc/options.rb, line 193
  def parse(argv)
    accessors = []

    opts = OptionParser.new do |opt|
      opt.program_name = File.basename $0
      opt.version = RDoc::VERSION
      opt.release = nil
      opt.summary_indent = ' ' * 4
      opt.banner = Usage: #{opt.program_name} [options] [names...]  Files are parsed, and the information they contain collected, before any  output is produced. This allows cross references between all files to be  resolved. If a name is a directory, it is traversed. If no names are  specified, all Ruby files in the current directory (and subdirectories) are  processed.  How RDoc generates output depends on the output formatter being used, and on  the options you give.  - HTML output is normally produced into a number of separate files    (one per class, module, and file, along with various indices).    These files will appear in the directory given by the --op    option (doc/ by default).  - XML output by default is written to standard output. If a    --opname option is given, the output will instead be written    to a file with that name in the output directory.  - .chm files (Windows help files) are written in the --op directory.    If an --opname parameter is present, that name is used, otherwise    the file will be called rdoc.chm.

      opt.separator nil
      opt.separator "Options:"
      opt.separator nil

      opt.on("--accessor=ACCESSORS", "-A", Array,
             "A comma separated list of additional class",
             "methods that should be treated like",
             "'attr_reader' and friends.",
             " ",
             "Option may be repeated.",
             " ",
             "Each accessorname may have '=text'",
             "appended, in which case that text appears",
             "where the r/w/rw appears for normal.",
             "accessors") do |value|
        value.each do |accessor|
          if accessor =~ /^(\w+)(=(.*))?$/
            accessors << $1
            @extra_accessor_flags[$1] = $3
          end
        end
      end

      opt.separator nil

      opt.on("--all", "-a",
             "Include all methods (not just public) in",
             "the output.") do |value|
        @show_all = value
      end

      opt.separator nil

      opt.on("--charset=CHARSET", "-c",
             "Specifies the output HTML character-set.") do |value|
        @charset = value
      end

      opt.separator nil

      opt.on("--debug", "-D",
             "Displays lots on internal stuff.") do |value|
        $DEBUG_RDOC = value
      end

      opt.separator nil

      opt.on("--diagram", "-d",
             "Generate diagrams showing modules and",
             "classes. You need dot V1.8.6 or later to",
             "use the --diagram option correctly. Dot is",
             "available from http://graphviz.org") do |value|
        check_diagram
        @diagram = true
      end

      opt.separator nil

      opt.on("--exclude=PATTERN", "-x", Regexp,
             "Do not process files or directories",
             "matching PATTERN.") do |value|
        @exclude << value
      end

      opt.separator nil

      opt.on("--extension=NEW=OLD", "-E",
             "Treat files ending with .new as if they",
             "ended with .old. Using '-E cgi=rb' will",
             "cause xxx.cgi to be parsed as a Ruby file.") do |value|
        new, old = value.split(/=/, 2)

        unless new and old then
          raise OptionParser::InvalidArgument, "Invalid parameter to '-E'"
        end

        unless RDoc::ParserFactory.alias_extension old, new then
          raise OptionParser::InvalidArgument, "Unknown extension .#{old} to -E"
        end
      end

      opt.separator nil

      opt.on("--fileboxes", "-F",
             "Classes are put in boxes which represents",
             "files, where these classes reside. Classes",
             "shared between more than one file are",
             "shown with list of files that are sharing",
             "them. Silently discarded if --diagram is",
             "not given.") do |value|
        @fileboxes = value
      end

      opt.separator nil

      opt.on("--force-update", "-U",
             "Forces rdoc to scan all sources even if",
             "newer than the flag file.") do |value|
        @force_update = value
      end

      opt.separator nil

      opt.on("--fmt=FORMAT", "--format=FORMAT", "-f", @generators.keys,
             "Set the output formatter.") do |value|
        @generator_name = value.downcase
        setup_generator
      end

      opt.separator nil

      image_formats = ]gif png jpg jpeg]
      opt.on("--image-format=FORMAT", "-I", image_formats,
             "Sets output image format for diagrams. Can",
             "be #{image_formats.join ', '}. If this option",
             "is omitted, png is used. Requires",
             "diagrams.") do |value|
        @image_format = value
      end

      opt.separator nil

      opt.on("--include=DIRECTORIES", "-i", Array,
             "set (or add to) the list of directories to",
             "be searched when satisfying :include:",
             "requests. Can be used more than once.") do |value|
        @rdoc_include.concat value.map { |dir| dir.strip }
      end

      opt.separator nil

      opt.on("--inline-source", "-S",
             "Show method source code inline, rather than",
             "via a popup link.") do |value|
        @inline_source = value
      end

      opt.separator nil

      opt.on("--line-numbers", "-N",
             "Include line numbers in the source code.") do |value|
        @include_line_numbers = value
      end

      opt.separator nil

      opt.on("--main=NAME", "-m",
             "NAME will be the initial page displayed.") do |value|
        @main_page = value
      end

      opt.separator nil

      opt.on("--merge", "-M",
             "When creating ri output, merge previously",
             "processed classes into previously",
             "documented classes of the same name.") do |value|
        @merge = value
      end

      opt.separator nil

      opt.on("--one-file", "-1",
             "Put all the output into a single file.") do |value|
        @all_one_file = value
        @inline_source = value if value
        @template = 'one_page_html'
      end

      opt.separator nil

      opt.on("--op=DIR", "-o",
             "Set the output directory.") do |value|
        @op_dir = value
      end

      opt.separator nil

      opt.on("--opname=NAME", "-n",
             "Set the NAME of the output. Has no effect",
             "for HTML.") do |value|
        @op_name = value
      end

      opt.separator nil

      opt.on("--promiscuous", "-p",
             "When documenting a file that contains a",
             "module or class also defined in other",
             "files, show all stuff for that module or",
             "class in each files page. By default, only",
             "show stuff defined in that particular file.") do |value|
        @promiscuous = value
      end

      opt.separator nil

      opt.on("--quiet", "-q",
             "Don't show progress as we parse.") do |value|
        @verbosity = 0
      end

      opt.on("--verbose", "-v",
             "Display extra progress as we parse.") do |value|
        @verbosity = 2
      end


      opt.separator nil

      opt.on("--ri", "-r",
             "Generate output for use by `ri`. The files",
             "are stored in the '.rdoc' directory under",
             "your home directory unless overridden by a",
             "subsequent --op parameter, so no special",
             "privileges are needed.") do |value|
        @generator_name = "ri"
        @op_dir = RDoc::RI::Paths::HOMEDIR
        setup_generator
      end

      opt.separator nil

      opt.on("--ri-site", "-R",
             "Generate output for use by `ri`. The files",
             "are stored in a site-wide directory,",
             "making them accessible to others, so",
             "special privileges are needed.") do |value|
        @generator_name = "ri"
        @op_dir = RDoc::RI::Paths::SITEDIR
        setup_generator
      end

      opt.separator nil

      opt.on("--ri-system", "-Y",
             "Generate output for use by `ri`. The files",
             "are stored in a site-wide directory,",
             "making them accessible to others, so",
             "special privileges are needed.  This",
             "option is intended to be used during Ruby",
             "installation.") do |value|
        @generator_name = "ri"
        @op_dir = RDoc::RI::Paths::SYSDIR
        setup_generator
      end

      opt.separator nil

      opt.on("--show-hash", "-H",
             "A name of the form #name in a comment is a",
             "possible hyperlink to an instance method",
             "name. When displayed, the '#' is removed",
             "unless this option is specified.") do |value|
        @show_hash = value
      end

      opt.separator nil

      opt.on("--style=URL", "-s",
             "Specifies the URL of a separate stylesheet.") do |value|
        @css = value
      end

      opt.separator nil

      opt.on("--tab-width=WIDTH", "-w", OptionParser::DecimalInteger,
             "Set the width of tab characters.") do |value|
        @tab_width = value
      end

      opt.separator nil

      opt.on("--template=NAME", "-T",
             "Set the template used when generating",
             "output.") do |value|
        @template = value
      end

      opt.separator nil

      opt.on("--title=TITLE", "-t",
             "Set TITLE as the title for HTML output.") do |value|
        @title = value
      end

      opt.separator nil

      opt.on("--webcvs=URL", "-W",
             "Specify a URL for linking to a web frontend",
             "to CVS. If the URL contains a '\%s', the",
             "name of the current file will be",
             "substituted; if the URL doesn't contain a",
             "'\%s', the filename will be appended to it.") do |value|
        @webcvs = value
      end
    end

    argv.insert(0, *ENV['RDOCOPT'].split) if ENV['RDOCOPT']

    opts.parse! argv

    @files = argv.dup

    @rdoc_include << "." if @rdoc_include.empty?

    if @exclude.empty? then
      @exclude = nil
    else
      @exclude = Regexp.new(@exclude.join("|"))
    end

    check_files

    # If no template was specified, use the default template for the output
    # formatter

    @template ||= @generator_name

    # Generate a regexp from the accessors
    unless accessors.empty? then
      re = '^(' + accessors.map { |a| Regexp.quote a }.join('|') + ')$'
      @extra_accessors = Regexp.new re
    end

  rescue OptionParser::InvalidArgument, OptionParser::InvalidOption => e
    puts opts
    puts
    puts e
    exit 1
  end