@@ -342,38 +342,40 @@ a list of command-line arguments passed to the compression program."
be a procedure that takes the original expression in string and returns a new
one. ENCODING will be used to interpret all port I/O, it default to UTF-8.
This procedure returns #t on success."
+ (define file (assq-ref source-properties 'filename))
+ (define line (assq-ref source-properties 'line))
+ (define column (assq-ref source-properties 'column))
+
(with-fluids ((%default-port-encoding encoding))
- (let* ((file (assq-ref source-properties 'filename))
- (line (assq-ref source-properties 'line))
- (column (assq-ref source-properties 'column))
- (in (open-input-file file))
- ;; The start byte position of the expression.
- (start (begin (while (not (and (= line (port-line in))
- (= column (port-column in))))
- (when (eof-object? (read-char in))
- (error (format #f "~a: end of file~%" in))))
- (ftell in)))
- ;; The end byte position of the expression.
- (end (begin (read in) (ftell in))))
- (seek in 0 SEEK_SET) ; read from the beginning of the file.
- (let* ((pre-bv (get-bytevector-n in start))
- ;; The expression in string form.
- (str (iconv:bytevector->string
- (get-bytevector-n in (- end start))
- (port-encoding in)))
- (post-bv (get-bytevector-all in))
- (str* (proc str)))
- ;; Verify the edited expression is still a scheme expression.
- (call-with-input-string str* read)
- ;; Update the file with edited expression.
- (with-atomic-file-output file
- (lambda (out)
- (put-bytevector out pre-bv)
- (display str* out)
- ;; post-bv maybe the end-of-file object.
- (when (not (eof-object? post-bv))
- (put-bytevector out post-bv))
- #t))))))
+ (call-with-input-file file
+ (lambda (in)
+ (let* ( ;; The start byte position of the expression.
+ (start (begin (while (not (and (= line (port-line in))
+ (= column (port-column in))))
+ (when (eof-object? (read-char in))
+ (error (format #f "~a: end of file~%" in))))
+ (ftell in)))
+ ;; The end byte position of the expression.
+ (end (begin (read in) (ftell in))))
+ (seek in 0 SEEK_SET) ; read from the beginning of the file.
+ (let* ((pre-bv (get-bytevector-n in start))
+ ;; The expression in string form.
+ (str (iconv:bytevector->string
+ (get-bytevector-n in (- end start))
+ (port-encoding in)))
+ (post-bv (get-bytevector-all in))
+ (str* (proc str)))
+ ;; Verify the edited expression is still a scheme expression.
+ (call-with-input-string str* read)
+ ;; Update the file with edited expression.
+ (with-atomic-file-output file
+ (lambda (out)
+ (put-bytevector out pre-bv)
+ (display str* out)
+ ;; post-bv maybe the end-of-file object.
+ (when (not (eof-object? post-bv))
+ (put-bytevector out post-bv))
+ #t))))))))
;;;