module Byebug::ThreadFunctions

def display_context(context, should_show_top_frame = true)
  args = thread_arguments(context, should_show_top_frame)
  print "%s%s%d %s\t%s\n", args[:status_flag], args[:debug_flag], args[:id],
                           args[:thread], args[:file_line]
end

def parse_thread_num(subcmd, arg)
  if '' == arg
    errmsg "\"#{subcmd}\" needs a thread number"
    nil
  else
    thread_num = get_int(arg, subcmd, 1)
    return nil unless thread_num
    get_context(thread_num)
  end
end

def parse_thread_num_for_cmd(subcmd, arg)
  c = parse_thread_num(subcmd, arg)
  return nil unless c
  case
  when nil == c
    errmsg 'No such thread'
  when @state.context == c
    errmsg "It's the current thread"
  when c.ignored?
    errmsg "Can't #{subcmd} thread #{arg}"
  else
    return c
  end
  return nil
end

def thread_arguments(context, should_show_top_frame = true)
  status_flag = if context.suspended?
    "$"
  else
    context.thread == Thread.current ? '+' : ' '
  end
  debug_flag = context.ignored? ? '!' : ' '
  if should_show_top_frame
    if context.thread == Thread.current
      file = @state.context.frame_file(0)
      line = @state.context.frame_line(0)
    else
      if context.thread.backtrace_locations &&
         context.thread.backtrace_locations[0]
        file = context.thread.backtrace_locations[0].path
        line = context.thread.backtrace_locations[0].lineno
      end
    end
    file_line = "#{file}:#{line}"
  end
  {
    status_flag: status_flag,
    debug_flag: debug_flag,
    id: context.thnum,
    thread: context.thread.inspect,
    file_line: file_line ? file_line : ''
  }
end