e "meme" chat protocol
Elliott Hird, December 2007

= Message format ===============================================================
<message> = <tag>\t<command>[\t<args>]\n

<tag> is a base-10 number.
<command> is one of the valid commands (described below).

<args> = <key>: <value>[\t<args>]

<key> is one of the valid argument names for the command.
<value> is any UTF-8 string -- to escape tabs, use '\t' in the message, and to
escape backslashes, use '\.'.

= Example session ==============================================================
(Note: replace 8 spaces with a tab.)

> = from client
< = from server

> 1        hello        client: netcat        user: ehird
< 1        ok
> 2        join        room: main
< 2        ok
< -        join        room: main        user: ehird
> 3        say        room: main        text: Hello, world!
< 3        ok
< -        say        room: main        user: ehird        text: Hello, world!
> 4        bye        reason: quit
< 4        ok

= Server responses =============================================================
<response> = <tag>\t<status>[\t<args>]\n

<tag> and <args> are the same as above, <status> is either "ok" or "fail".

The arguments given are command-specific.

= Server messages ==============================================================
<server-message> = -\t<type>[\t<args>]\n

<type> is one of the valid server messages (described below).

Most often resembles the message that triggered it.