Does this version work right?
(defun blink-matching-open ()
"Move cursor momentarily to the beginning of the sexp before point."
(interactive)
(when (and (> (point) (1+ (point-min)))
blink-matching-paren
;; Verify an even number of quoting characters precede the close.
(= 1 (logand 1 (- (point)
(save-excursion
(forward-char -1)
(skip-syntax-backward "/\\")
(point))))))
(let* ((oldpos (point))
(blinkpos)
(mismatch)
message-log-max
matching-paren
open-paren-line-string)
(save-excursion
(save-restriction
(if blink-matching-paren-distance
(narrow-to-region (max (point-min)
(- (point) blink-matching-paren-distance))
oldpos))
(condition-case ()
(let ((parse-sexp-ignore-comments
(and parse-sexp-ignore-comments
(not blink-matching-paren-dont-ignore-comments))))
(setq blinkpos (scan-sexps oldpos -1)))
(error nil)))
(and blinkpos
;; Not syntax '$'.
(not (eq (syntax-class (syntax-after blinkpos)) 8))
(setq matching-paren
(let ((syntax (syntax-after blinkpos)))
(and (consp syntax)
(eq (syntax-class syntax) 4)
(cdr syntax)))
mismatch
(or (null matching-paren)
(/= (char-after (1- oldpos))
matching-paren))))
(if mismatch (setq blinkpos nil))
(if blinkpos
;; Don't log messages about paren matching.
(if (save-excursion
(goto-char blinkpos)
(pos-visible-in-window-p))
(progn
(goto-char blinkpos)
(and blink-matching-paren-on-screen
(sit-for blink-matching-delay)))
(save-excursion
(goto-char blinkpos)
(setq open-paren-line-string
;; Show what precedes the open in its line, if anything.
(if (save-excursion
(skip-chars-backward " \t")
(not (bolp)))
(buffer-substring (progn (beginning-of-line) (point))
(1+ blinkpos))
;; Show what follows the open in its line, if anything.
(if (save-excursion
(forward-char 1)
(skip-chars-forward " \t")
(not (eolp)))
(buffer-substring blinkpos
(progn (end-of-line) (point)))
;; Otherwise show the previous nonblank line,
;; if there is one.
(if (save-excursion
(skip-chars-backward "\n \t")
(not (bobp)))
(concat
(buffer-substring (progn
(skip-chars-backward "\n \t")
(beginning-of-line)
(point))
(progn (end-of-line)
(skip-chars-backward "
\t")
(point)))
;; Replace the newline and other whitespace with
`...'.
"..."
(buffer-substring blinkpos (1+ blinkpos)))
;; There is nothing to show except the char itself.
(buffer-substring blinkpos (1+ blinkpos)))))))
(message "Matches %s"
(substring-no-properties open-paren-line-string)))
(cond (mismatch
(message "Mismatched parentheses"))
((not blink-matching-paren-distance)
(message "Unmatched parenthesis"))))))))
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