class Gem::Commands::HelpCommand

def show_command_help(command_name) # :nodoc:
  command_name = command_name.downcase
  possibilities = @command_manager.find_command_possibilities command_name
  if possibilities.size == 1
    command = @command_manager[possibilities.first]
    command.invoke("--help")
  elsif possibilities.size > 1
    alert_warning "Ambiguous command #{command_name} (#{possibilities.join(", ")})"
  else
    alert_warning "Unknown command #{command_name}. Try: gem help commands"
  end
end