--Prepends "Received: " to each received message and "Sending: " to each
--sent one. Also, prints "appender.lua greets you!" at startup.

io.stdout:write "appender.lua greets you!\n"
io.stdout:flush()

return {
  recv = function (self)
    local line, err = self.super:recv()
    if line == nil then
      return line, err
    end
    return "Received: " .. line
  end,
  send = function (self, buf)
    self.super:send("Sending: " .. buf)
  end,
}