class IRB::Command::ShowDoc

# File lib/irb/command/show_doc.rb, line 25
def execute(arg)
  # Accept string literal for backward compatibility
  name = unwrap_string_literal(arg)
  require 'rdoc/ri/driver'

  unless ShowDoc.const_defined?(:Ri)
    opts = RDoc::RI::Driver.process_args([])
    ShowDoc.const_set(:Ri, RDoc::RI::Driver.new(opts))
  end

  if name.nil?
    Ri.interactive
  else
    begin
      Ri.display_name(name)
    rescue RDoc::RI::Error
      puts $!.message
    end
  end

  nil
rescue LoadError, SystemExit
  warn "Can't display document because `rdoc` is not installed."
end