+(define irc-eol "\r\n")
+
+(define (irc-line line)
+ (string-concatenate (list line irc-eol)))
+
+(define-syntax-rule (irc-format dest format-string rest ...)
+ (let ((line (string-concatenate
+ (list (format #f format-string rest ...)
+ irc-eol))))
+ (match dest
+ (#f line)
+ (#t (display line))
+ (else
+ (display line dest)))))
+
+(define* (irc-display line #:optional dest)
+ (if dest
+ (display (irc-line line) dest)
+ (display (irc-line dest))))
+
+(define* (handle-login socket username
+ #:optional
+ (hostname "*")
+ (servername "*")
+ (realname username)
+ (channels '()))
+ (irc-format socket "USER ~a ~a ~a :~a"
+ username hostname servername realname)
+ (irc-format socket "NICK ~a" username)
+ (for-each
+ (lambda (channel)
+ (irc-format socket "JOIN ~a" channel))
+ channels))
+