options

# File railties/lib/commands/plugin.rb, line 651
    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.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