(isearch-success-function): New variable with default

to `isearch-success-function-default'.
(isearch-search): Call a function from `isearch-success-function'
instead of calling the hard-coded `isearch-range-invisible'.
(isearch-success-function-default): New function that calls
`isearch-range-invisible' and inverts its return value.

1 files changed, 19 insertions, 5 deletions

diff --git a/lisp/isearch.el b/lisp/isearch.el
index 675fc7a0f08..92176236d5c 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -178,6 +178,12 @@ or to the end of the buffer for a backward search.")
   "Function to save a function restoring the mode-specific isearch state
 to the search status stack.")
 
+(defvar isearch-success-function 'isearch-success-function-default
+  "Function to report whether the new search match is considered successful.
+The function has two arguments: the positions of start and end of text
+matched by the search.  It this function returns nil, continue
+searching without stopping at this match.")
+
 ;; Search ring.
 
 (defvar search-ring nil
@@ -2104,7 +2110,9 @@ Can be changed via `isearch-search-fun-function' for special needs."
       (setq isearch-case-fold-search
 	    (isearch-no-upper-case-p isearch-string isearch-regexp)))
   (condition-case lossage
-      (let ((inhibit-point-motion-hooks search-invisible)
+      (let ((inhibit-point-motion-hooks
+	     (and (eq isearch-success-function 'isearch-success-function-default)
+		  search-invisible))
 	    (inhibit-quit nil)
 	    (case-fold-search isearch-case-fold-search)
 	    (search-spaces-regexp search-whitespace-regexp)
@@ -2115,12 +2123,11 @@ Can be changed via `isearch-search-fun-function' for special needs."
 		(isearch-search-string isearch-string nil t))
 	  ;; Clear RETRY unless we matched some invisible text
 	  ;; and we aren't supposed to do that.
-	  (if (or (eq search-invisible t)
-		  (not isearch-success)
+	  (if (or (not isearch-success)
 		  (bobp) (eobp)
 		  (= (match-beginning 0) (match-end 0))
-		  (not (isearch-range-invisible
-			(match-beginning 0) (match-end 0))))
+		  (funcall isearch-success-function
+			   (match-beginning 0) (match-end 0)))
 	      (setq retry nil)))
 	(setq isearch-just-started nil)
 	(if isearch-success
@@ -2298,6 +2305,13 @@ Can be changed via `isearch-search-fun-function' for special needs."
 		  nil)
 	      (setq isearch-hidden t)))))))
 
+(defun isearch-success-function-default (beg end)
+  "Default function to report if the new search match is successful.
+Returns t if search can match hidden text, or otherwise checks if some
+text from BEG to END is visible."
+  (or (eq search-invisible t)
+      (not (isearch-range-invisible beg end))))
+
 
 ;; General utilities