function info(msg)
  print("info msg="..msg)
end

function read_cfg(name, required)
  local filename = "cfg-"..name
  if not file.open(filename, "r") then
    if required then
      panic("Could not read configuration file: "..filename)
    else
      return nil
    end
  end
  local value = file.readline()
  file.close()
  if value == nil or #value == 0 then
    if required then
      panic("Empty configuration file: "..filename)
    else
      return nil
    end
  end
  return string.sub(value, 1, -2)
end

function write_cfg(name, value)
  local filename = "cfg-"..name
  local ok
  ok = file.open(filename, "w+")
  if ok then
    ok = file.writeline(value)
    file.flush()
    file.close()
  end
  return ok
end