--?   print('text.draw:', line_index, State.left, State.right)

function file_exists(filename)
  local infile = App.open_for_reading(filename)
  if infile then
    infile:close()
    return true
  else
    return false
  end
end

end
function trim(s)
  return s:gsub('^%s+', ''):gsub('%s+$', '')