class Byebug::FrameCommand

def self.description
  <<-EOD
    f[rame][ frame-number]
    #{short_description}
    If a frame number has been specified, to moves to that frame. Otherwise
    it moves to the newest frame.
    A negative number indicates position from the other end, so "frame -1"
    moves to the oldest frame, and "frame 0" moves to the newest frame.
    Without an argument, the command prints the current stack frame. Since
    the current position is redisplayed, it may trigger a resyncronization
    if there is a front end also watching over things.
    Use the "bt" command to find out where you want to go.
  EOD
end

def self.regexp
  /^\s* f(?:rame)? (?:\s+(\S+))? \s*$/x
end

def self.short_description
  'Moves to a frame in the call stack'
end

def execute
  return print(pr('frame.line', context.frame.to_hash)) unless @match[1]
  pos, err = get_int(@match[1], 'Frame')
  return errmsg(err) unless pos
  switch_to_frame(pos)
  ListCommand.new(processor).execute if Setting[:autolist]
end