class Byebug::WhereCommand

def description
  prettify <<-EOD
    w[here]|bt|backtrace        Display stack frames.
    Print the entire stack frame. Each frame is numbered; the most recent
    frame is 0. A frame number can be referred to in the "frame" command;
    "up" and "down" add or subtract respectively to frame numbers shown.
    The position of the current frame is marked with -->. C-frames hang
    from their most immediate Ruby frame to indicate that they are not
    navigable.
  EOD
end

def execute
  print_backtrace
end

def names
  %w(where backtrace bt)
end

def print_backtrace
  bt = prc('frame.line', (0...@state.context.stack_size)) do |_, index|
    get_pr_arguments(index)
  end
  print(bt)
end

def regexp
  /^\s* (?:w(?:here)?|bt|backtrace) \s*$/x
end