class Pry::Command::WatchExpression

def options(opt)
  opt.on :d, :delete,
         "Delete the watch expression with the given index. If no index " \
         "is given; clear all watch expressions.",
         optional_argument: true, as: Integer
  opt.on :l, :list,
         "Show all current watch expressions and their values. Calling " \
         "watch with no expressions or options will also show the watch " \
         "expressions."
end