Limit output messages to hardcoded char limit to avoid overtly long messages being cut by the server

lib/connection.ex

@@ -6,6 +6,14 @@ defmodule Nulform.Connection do
     Connection automatically handles using an altnick (but only one) and
     responding to pings.
     """
+
+    @doc """
+    Message max length excluding CRLF. This is smaller than the RFC specifies
+    (510) to accommodate for a potentially long hostmask which will take up
+    space in the message.
+    """
+    @max_len 440
+
     defrecord Data,
         handler: nil,
         buffer: nil,
@@ -111,8 +119,8 @@ defmodule Nulform.Connection do
     end
 
     defp send_raw(data, msg) do
-        :ok = :gen_tcp.send data.sock, msg <> "\r\n"
-        IO.puts(to_binary(data.id) <> " <- " <> msg)
+        :ok = :gen_tcp.send data.sock, String.slice(msg, 0, @max_len) <> "\r\n"
+        IO.puts(to_binary(data.id) <> " <- " <> String.slice(msg, 0, @max_len))
     end
 
     defp tell_handler(data, msg) do