class Bundler::CLI

def help(cli = nil)
  case cli
  when "gemfile" then command = "gemfile"
  when nil       then command = "bundle"
  else command = "bundle-#{cli}"
  end
  man_path = File.expand_path("man", __dir__)
  man_pages = Hash[Dir.glob(File.join(man_path, "**", "*")).grep(/.*\.\d*\Z/).collect do |f|
    [File.basename(f, ".*"), f]
  end]
  if man_pages.include?(command)
    man_page = man_pages[command]
    if Bundler.which("man") && man_path !~ %r{^file:/.+!/META-INF/jruby.home/.+}
      Kernel.exec "man #{man_page}"
    else
      puts File.read("#{man_path}/#{File.basename(man_page)}.ronn")
    end
  elsif command_path = Bundler.which("bundler-#{cli}")
    Kernel.exec(command_path, "--help")
  else
    super
  end
end