stk/Lib/fileevent.stk

;;;;
;;;; f i l e e v e n t . s t k 		-- Implement the Tk fileevent commeand
;;;;					   in term of when-port-{read|writ}able
;;;;					   For backward compatibility ...
;;;;
;;;;
;;;; Copyright <20> 1993-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;; 
;;;; Permission to use, copy, modify, distribute,and license this
;;;; software and its documentation for any purpose is hereby granted,
;;;; provided that existing copyright notices are retained in all
;;;; copies and that this notice is included verbatim in any
;;;; distributions.  No written agreement, license, or royalty fee is
;;;; required for any of the authorized uses.
;;;; This software is provided ``AS IS'' without express or implied
;;;; warranty.
;;;;
;;;;           Author: Erick Gallesio [eg@unice.fr]
;;;;    Creation date: 16-Jun-1996 22:37
;;;; Last file update:  3-Sep-1999 19:51 (eg)

(select-module Tk)

(define (fileevent file mode . script)
  (define (err)
    (error "fileeevent: bad mode specification ~S.\n(Note: fileevent is obsolete; use when-port-readable or when-port-writable)" mode))
    
  (let ((smode (& mode))
	(fct   #f))
    (cond 
       ((equal? smode "readable") (set! fct when-port-readable))
       ((equal? smode "writable") (set! fct when-port-writable))
       (ELSE 			  (err)))
    (if (null? script)
	(fct file)
	(let ((s (car script)))
	  (cond 
	   ((procedure? s)    (fct file s))
	   ((string? s)       (if (string=? s "") (fct file #f) (err)))
	   (ELSE	      (err)))))))

(define Tk:fileevent fileevent)