global

def options(opt)
  opt.on :v, :verbose, "Include extra information."
  opt.on :H, :head, "Display the first N stack frames (defaults to 10).", :optional_argument => true, :as => Integer, :default => 10
  opt.on :T, :tail, "Display the last N stack frames (defaults to 10).", :optional_argument => true, :as => Integer, :default => 10
  opt.on :c, :current, "Display N frames either side of current frame (default to 5).", :optional_argument => true, :as => Integer, :default => 5
  opt.on :a, :app, "Display application frames only", optional_argument: true
end