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-rw-r--r--Tscript.scm60
1 files changed, 60 insertions, 0 deletions
diff --git a/Tscript.scm b/Tscript.scm
new file mode 100644
index 0000000..22b80ea
--- /dev/null
+++ b/Tscript.scm
@@ -0,0 +1,60 @@
+(define transcript-on #f)
+(define transcript-off #f)
+
+(let ((*transcript-stack* '()))
+ (define (trans-on filename)
+ (let ((trans (open-output-file filename))
+ (inp (current-input-port))
+ (outp (current-output-port))
+ (errp (current-error-port)))
+ (define (clone-port port)
+ (make-soft-port
+ (vector (and (output-port? port)
+ (lambda (c)
+ (write-char c port)
+ (write-char c trans)))
+ (and (output-port? port)
+ (lambda (s)
+ (display s port)
+ (display s trans)))
+ (and (output-port? port)
+ (lambda ()
+ (force-output port)
+ (force-output trans)))
+ (and (input-port? port)
+ (lambda ()
+ (let ((c (read-char port)))
+ (write-char c trans)
+ c)))
+ (lambda ()
+ (close-port port)))
+ (if (input-port? port)
+ (if (output-port? port) "r+" "r")
+ "w")))
+
+ (set! *transcript-stack*
+ (cons (list trans
+ (current-input-port)
+ (current-output-port)
+ (current-error-port))
+ *transcript-stack*))
+ (set-current-input-port (clone-port inp))
+ (set-current-output-port (clone-port outp))
+ (set-current-error-port (clone-port errp))))
+
+ (define (trans-off)
+ (cond ((pair? *transcript-stack*)
+ (apply (lambda (trans inp outp errp)
+ (close-port trans)
+ (set-current-input-port inp)
+ (set-current-output-port outp)
+ (set-current-error-port errp))
+ (car *transcript-stack*))
+ (set! *transcript-stack* (cdr *transcript-stack*)))
+ (else
+ (error "No transcript active"))))
+
+ (set! transcript-on trans-on)
+ (set! transcript-off trans-off))
+
+(provide 'transcript) \ No newline at end of file