ghc-irc-ctcp

A CTCP encoding and decoding library for IRC clients

CTCP (Client To Client Protocol) is a way of sending arbitrary data over an IRC network, which may include bytes not allowed in standard IRC messages. CTCPs are sent as a PRIVMSG or NOTICE, where the first and last characters as '\001' (SOH), and special bytes are escaped by encoding them into a two-byte sequence beginning with '\020' (DLE). CTCPs consist of command name (typically in upper-case) followed by list of space-separated arguments, which may be empty. One use of CTCPs supported by the vast majority of IRC clients today is the ACTION command, typically invoked with /me. For example, if the user 'foo' in the channel '#bar' were to issue > /me dances everyone in the channel would receive the message > :foo PRIVMSG #bar :001ACTION dances001 Other common uses of CTCP include requesting the name and version of a user's IRC client, their local time, determining ping times, and initiating file transfers (DCC). Characters are escaped as follows: ['\000' (NUL)] '\020 \060' ("0") ['\012' (NL)] '\020 \156' ("n") ['\015' (CR)] '\020 \162' ("r") ['\020' (DLE)] '\020 \020' All other appearences of the escape character are errors, and are dropped. See <<a href="http://www.irchelp.org/irchelp/rfc/ctcpspec.html>">http://www.irchelp.org/irchelp/rfc/ctcpspec.html></a> for more details.

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