instance method options

# File railties/lib/commands/plugin.rb, line 757
    def options
      OptionParser.new do |o|
        o.set_summary_indent('  ')
        o.banner =    "Usage: #{@base_command.script_name} install PLUGIN [PLUGIN [PLUGIN] ...]"
        o.define_head "Install one or more plugins."
        o.separator   ""
        o.separator   "Options:"
        o.on(         "-x", "--externals", 
                      "Use svn:externals to grab the plugin.", 
                      "Enables plugin updates and plugin versioning.") { |v| @method = :externals }
        o.on(         "-o", "--checkout",
                      "Use svn checkout to grab the plugin.",
                      "Enables updating but does not add a svn:externals entry.") { |v| @method = :checkout }
        o.on(         "-e", "--export",
                      "Use svn export to grab the plugin.",
                      "Exports the plugin, allowing you to check it into your local repository. Does not enable updates, or add an svn:externals entry.") { |v| @method = :export }
        o.on(         "-q", "--quiet",
                      "Suppresses the output from installation.",
                      "Ignored if -v is passed (./script/plugin -v install ...)") { |v| @options[:quiet] = true }
        o.on(         "-r REVISION", "--revision REVISION",
                      "Checks out the given revision from subversion or git.",
                      "Ignored if subversion/git is not used.") { |v| @options[:revision] = v }
        o.on(         "-f", "--force",
                      "Reinstalls a plugin if it's already installed.") { |v| @options[:force] = true }
        o.separator   ""
        o.separator   "You can specify plugin names as given in 'plugin list' output or absolute URLs to "
        o.separator   "a plugin repository."
      end
    end