(time-stamp-string-preprocess): Add %U code.

[gnu-emacs] / lisp / replace.el

diff --git a/lisp/replace.el b/lisp/replace.el
index 7fbba5f1faba8601b109fdbf1bfc50897cbf579f..e1e14c92faf041ee75a5e2cba3614ea2dc6c174d 100644 (file)
--- a/lisp/replace.el
+++ b/lisp/replace.el
@@ -1,6 +1,6 @@
 ;;; replace.el --- replace commands for Emacs.
 
 ;;; replace.el --- replace commands for Emacs.
 

-;; Copyright (C) 1985, 1986, 1987, 1992 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 86, 87, 92, 94, 96, 1997 Free Software Foundation, Inc.

 
 ;; This file is part of GNU Emacs.
 
 
 ;; This file is part of GNU Emacs.
 


@@ -15,8 +15,9 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License

-;; along with GNU Emacs; see the file COPYING.  If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.

 
 ;;; Commentary:
 
 
 ;;; Commentary:
 


@@ -25,19 +26,46 @@
 
 ;;; Code:
 
 
 ;;; Code:
 

-(defconst case-replace t "\
-*Non-nil means query-replace should preserve case in replacements.")
+(defcustom case-replace t
+  "*Non-nil means query-replace should preserve case in replacements."
+  :type 'boolean
+  :group 'matching)

 
 (defvar query-replace-history nil)
 
 
 (defvar query-replace-history nil)
 

-(defun query-replace-read-args (string)
+(defvar query-replace-interactive nil
+  "Non-nil means `query-replace' uses the last search string.
+That becomes the \"string to replace\".")
+
+(defcustom query-replace-from-history-variable 'query-replace-history
+  "History list to use for the FROM argument of query-replace commands.
+The value of this variable should be a symbol; that symbol
+is used as a variable to hold a history list for the strings
+or patterns to be replaced."
+  :group 'matching
+  :type 'symbol
+  :version "20.3")
+
+(defcustom query-replace-to-history-variable 'query-replace-history
+  "History list to use for the TO argument of query-replace commands.
+The value of this variable should be a symbol; that symbol
+is used as a variable to hold a history list for replacement
+strings or patterns."
+  :group 'matching
+  :type 'symbol
+  :version "20.3")
+
+(defun query-replace-read-args (string regexp-flag)

   (let (from to)
   (let (from to)

-    (setq from (read-from-minibuffer (format "%s: " string)
-                                    nil nil nil
-                                    'query-replace-history))
+    (if query-replace-interactive
+       (setq from (car (if regexp-flag regexp-search-ring search-ring)))
+      (setq from (read-from-minibuffer (format "%s: " string)
+                                      nil nil nil
+                                      query-replace-from-history-variable
+                                      nil t)))

     (setq to (read-from-minibuffer (format "%s %s with: " string from)
                                   nil nil nil
     (setq to (read-from-minibuffer (format "%s %s with: " string from)
                                   nil nil nil

-                                  'query-replace-history))
+                                  query-replace-to-history-variable from t))

     (list from to current-prefix-arg)))
 
 (defun query-replace (from-string to-string &optional arg)
     (list from to current-prefix-arg)))
 
 (defun query-replace (from-string to-string &optional arg)


@@ -45,15 +73,25 @@
 As each match is found, the user must type a character saying
 what to do with it.  For directions, type \\[help-command] at that time.
 
 As each match is found, the user must type a character saying
 what to do with it.  For directions, type \\[help-command] at that time.
 

-Preserves case in each replacement if  case-replace  and  case-fold-search
+In Transient Mark mode, if the mark is active, operate on the contents
+of the region.  Otherwise, operate from point to the end of the buffer.
+
+If `query-replace-interactive' is non-nil, the last incremental search
+string is used as FROM-STRING--you don't have to specify it with the
+minibuffer.
+
+Preserves case in each replacement if `case-replace' and `case-fold-search'

 are non-nil and FROM-STRING has no uppercase letters.
 are non-nil and FROM-STRING has no uppercase letters.

-Third arg DELIMITED (prefix arg if interactive) non-nil means replace
+\(Preserving case means that if the string matched is all caps, or capitalized,
+then its replacement is upcased or capitalized.)
+
+Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace

 only matches surrounded by word boundaries.
 
 To customize possible responses, change the \"bindings\" in `query-replace-map'."
 only matches surrounded by word boundaries.
 
 To customize possible responses, change the \"bindings\" in `query-replace-map'."

-  (interactive (query-replace-read-args "Query replace"))
-  (perform-replace from-string to-string t nil arg)
-  (or unread-command-events (message "Done")))
+  (interactive (query-replace-read-args "Query replace" nil))
+  (perform-replace from-string to-string t nil arg))
+

 (define-key esc-map "%" 'query-replace)
 
 (defun query-replace-regexp (regexp to-string &optional arg)
 (define-key esc-map "%" 'query-replace)
 
 (defun query-replace-regexp (regexp to-string &optional arg)


@@ -61,15 +99,23 @@ To customize possible responses, change the \"bindings\" in `query-replace-map'.
 As each match is found, the user must type a character saying
 what to do with it.  For directions, type \\[help-command] at that time.
 
 As each match is found, the user must type a character saying
 what to do with it.  For directions, type \\[help-command] at that time.
 

-Preserves case in each replacement if  case-replace  and  case-fold-search
+In Transient Mark mode, if the mark is active, operate on the contents
+of the region.  Otherwise, operate from point to the end of the buffer.
+
+If `query-replace-interactive' is non-nil, the last incremental search
+regexp is used as REGEXP--you don't have to specify it with the
+minibuffer.
+
+Preserves case in each replacement if `case-replace' and `case-fold-search'

 are non-nil and REGEXP has no uppercase letters.
 are non-nil and REGEXP has no uppercase letters.

-Third arg DELIMITED (prefix arg if interactive) non-nil means replace
+Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace

 only matches surrounded by word boundaries.
 only matches surrounded by word boundaries.

-In TO-STRING, \\& means insert what matched REGEXP,
-and \\=\\<n> means insert what matched <n>th \\(...\\) in REGEXP."
-  (interactive (query-replace-read-args "Query replace regexp"))
-  (perform-replace regexp to-string t t arg)
-  (or unread-command-events (message "Done")))
+In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
+and `\\=\\N' (where N is a digit) stands for
+ whatever what matched the Nth `\\(...\\)' in REGEXP."
+  (interactive (query-replace-read-args "Query replace regexp" t))
+  (perform-replace regexp to-string t t arg))
+(define-key esc-map [?\C-%] 'query-replace-regexp)

 
 (defun map-query-replace-regexp (regexp to-strings &optional arg)
   "Replace some matches for REGEXP with various strings, in rotation.
 
 (defun map-query-replace-regexp (regexp to-strings &optional arg)
   "Replace some matches for REGEXP with various strings, in rotation.


@@ -78,20 +124,28 @@ by spaces.  This command works like `query-replace-regexp' except
 that each successive replacement uses the next successive replacement string,
 wrapping around from the last such string to the first.
 
 that each successive replacement uses the next successive replacement string,
 wrapping around from the last such string to the first.
 

+In Transient Mark mode, if the mark is active, operate on the contents
+of the region.  Otherwise, operate from point to the end of the buffer.
+

 Non-interactively, TO-STRINGS may be a list of replacement strings.
 
 Non-interactively, TO-STRINGS may be a list of replacement strings.
 

+If `query-replace-interactive' is non-nil, the last incremental search
+regexp is used as REGEXP--you don't have to specify it with the minibuffer.
+

 A prefix argument N says to use each replacement string N times
 before rotating to the next."
   (interactive
    (let (from to)
 A prefix argument N says to use each replacement string N times
 before rotating to the next."
   (interactive
    (let (from to)

-     (setq from (read-from-minibuffer "Map query replace (regexp): "
-                                     nil nil nil
-                                     'query-replace-history))
+     (setq from (if query-replace-interactive
+                   (car regexp-search-ring)
+                 (read-from-minibuffer "Map query replace (regexp): "
+                                       nil nil nil
+                                       'query-replace-history nil t)))

      (setq to (read-from-minibuffer
               (format "Query replace %s with (space-separated strings): "
                       from)
               nil nil nil
      (setq to (read-from-minibuffer
               (format "Query replace %s with (space-separated strings): "
                       from)
               nil nil nil

-              'query-replace-history))
+              'query-replace-history from t))

      (list from to current-prefix-arg)))
   (let (replacements)
     (if (listp to-strings)
      (list from to current-prefix-arg)))
   (let (replacements)
     (if (listp to-strings)


@@ -106,42 +160,58 @@ before rotating to the next."
                                       (1+ (string-match " " to-strings))))
          (setq replacements (append replacements (list to-strings))
                to-strings ""))))
                                       (1+ (string-match " " to-strings))))
          (setq replacements (append replacements (list to-strings))
                to-strings ""))))

-    (perform-replace regexp replacements t t nil arg))
-  (or unread-command-events (message "Done")))
+    (perform-replace regexp replacements t t nil arg)))

 
 (defun replace-string (from-string to-string &optional delimited)
   "Replace occurrences of FROM-STRING with TO-STRING.
 Preserve case in each match if `case-replace' and `case-fold-search'
 are non-nil and FROM-STRING has no uppercase letters.
 
 (defun replace-string (from-string to-string &optional delimited)
   "Replace occurrences of FROM-STRING with TO-STRING.
 Preserve case in each match if `case-replace' and `case-fold-search'
 are non-nil and FROM-STRING has no uppercase letters.

-Third arg DELIMITED (prefix arg if interactive) non-nil means replace
+\(Preserving case means that if the string matched is all caps, or capitalized,
+then its replacement is upcased or capitalized.)
+
+In Transient Mark mode, if the mark is active, operate on the contents
+of the region.  Otherwise, operate from point to the end of the buffer.
+
+Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace

 only matches surrounded by word boundaries.
 
 only matches surrounded by word boundaries.
 

+If `query-replace-interactive' is non-nil, the last incremental search
+string is used as FROM-STRING--you don't have to specify it with the
+minibuffer.
+

 This function is usually the wrong thing to use in a Lisp program.
 What you probably want is a loop like this:
 This function is usually the wrong thing to use in a Lisp program.
 What you probably want is a loop like this:

-  (while (search-forward OLD-STRING nil t)
-    (replace-match REPLACEMENT nil t))
-which will run faster and will not set the mark or print anything."
-  (interactive (query-replace-read-args "Replace string"))
-  (perform-replace from-string to-string nil nil delimited)
-  (or unread-command-events (message "Done")))
+  (while (search-forward FROM-STRING nil t)
+    (replace-match TO-STRING nil t))
+which will run faster and will not set the mark or print anything.
+\(You may need a more complex loop if FROM-STRING can match the null string
+and TO-STRING is also null.)"
+  (interactive (query-replace-read-args "Replace string" nil))
+  (perform-replace from-string to-string nil nil delimited))

 
 (defun replace-regexp (regexp to-string &optional delimited)
   "Replace things after point matching REGEXP with TO-STRING.
 
 (defun replace-regexp (regexp to-string &optional delimited)
   "Replace things after point matching REGEXP with TO-STRING.

-Preserve case in each match if case-replace and case-fold-search
+Preserve case in each match if `case-replace' and `case-fold-search'

 are non-nil and REGEXP has no uppercase letters.
 are non-nil and REGEXP has no uppercase letters.

-Third arg DELIMITED (prefix arg if interactive) non-nil means replace
+Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace

 only matches surrounded by word boundaries.
 only matches surrounded by word boundaries.

-In TO-STRING, \\& means insert what matched REGEXP,
-and \\=\\<n> means insert what matched <n>th \\(...\\) in REGEXP.
+In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
+and `\\=\\N' (where N is a digit) stands for
+ whatever what matched the Nth `\\(...\\)' in REGEXP.
+
+In Transient Mark mode, if the mark is active, operate on the contents
+of the region.  Otherwise, operate from point to the end of the buffer.
+
+If `query-replace-interactive' is non-nil, the last incremental search
+regexp is used as REGEXP--you don't have to specify it with the minibuffer.

 
 This function is usually the wrong thing to use in a Lisp program.
 What you probably want is a loop like this:
   (while (re-search-forward REGEXP nil t)
 
 This function is usually the wrong thing to use in a Lisp program.
 What you probably want is a loop like this:
   (while (re-search-forward REGEXP nil t)

-    (replace-match REPLACEMENT nil nil))
+    (replace-match TO-STRING nil nil))

 which will run faster and will not set the mark or print anything."
 which will run faster and will not set the mark or print anything."

-  (interactive (query-replace-read-args "Replace regexp"))
-  (perform-replace regexp to-string nil t delimited)
-  (or unread-command-events (message "Done")))
+  (interactive (query-replace-read-args "Replace regexp" t))
+  (perform-replace regexp to-string nil t delimited))

 \f
 (defvar regexp-history nil
   "History list for some commands that read regular expressions.")
 \f
 (defvar regexp-history nil
   "History list for some commands that read regular expressions.")


@@ -153,7 +223,7 @@ A match split across lines preserves all the lines it lies in.
 Applies to all lines after point."
   (interactive (list (read-from-minibuffer
                      "Keep lines (containing match for regexp): "
 Applies to all lines after point."
   (interactive (list (read-from-minibuffer
                      "Keep lines (containing match for regexp): "

-                     nil nil nil 'regexp-history)))
+                     nil nil nil 'regexp-history nil t)))

   (save-excursion
     (or (bolp) (forward-line 1))
     (let ((start (point)))
   (save-excursion
     (or (bolp) (forward-line 1))
     (let ((start (point)))


@@ -180,7 +250,7 @@ If a match is split across lines, all the lines it lies in are deleted.
 Applies to lines after point."
   (interactive (list (read-from-minibuffer
                      "Flush lines (containing match for regexp): "
 Applies to lines after point."
   (interactive (list (read-from-minibuffer
                      "Flush lines (containing match for regexp): "

-                     nil nil nil 'regexp-history)))
+                     nil nil nil 'regexp-history nil t)))

   (save-excursion
     (while (and (not (eobp))
                (re-search-forward regexp nil t))
   (save-excursion
     (while (and (not (eobp))
                (re-search-forward regexp nil t))


@@ -194,7 +264,7 @@ Applies to lines after point."
   "Print number of matches for REGEXP following point."
   (interactive (list (read-from-minibuffer
                      "How many matches for (regexp): "
   "Print number of matches for REGEXP following point."
   (interactive (list (read-from-minibuffer
                      "How many matches for (regexp): "

-                     nil nil nil 'regexp-history)))
+                     nil nil nil 'regexp-history nil t)))

   (let ((count 0) opoint)
     (save-excursion
      (while (and (not (eobp))
   (let ((count 0) opoint)
     (save-excursion
      (while (and (not (eobp))


@@ -209,57 +279,128 @@ Applies to lines after point."
 (if occur-mode-map
     ()
   (setq occur-mode-map (make-sparse-keymap))
 (if occur-mode-map
     ()
   (setq occur-mode-map (make-sparse-keymap))

-  (define-key occur-mode-map "\C-c\C-c" 'occur-mode-goto-occurrence))
+  (define-key occur-mode-map [mouse-2] 'occur-mode-mouse-goto)
+  (define-key occur-mode-map "\C-c\C-c" 'occur-mode-goto-occurrence)
+  (define-key occur-mode-map "\C-m" 'occur-mode-goto-occurrence)
+  (define-key occur-mode-map "\M-n" 'occur-next)
+  (define-key occur-mode-map "\M-p" 'occur-prev)
+  (define-key occur-mode-map "g" 'revert-buffer))
+
+
+(defvar occur-buffer nil
+  "Name of buffer for last occur.")
+
+
+(defvar occur-nlines nil
+  "Number of lines of context to show around matching line.")
+
+(defvar occur-command-arguments nil
+  "Arguments that were given to `occur' when it made this buffer.")

 
 

-(defvar occur-buffer nil)
-(defvar occur-nlines nil)
-(defvar occur-pos-list nil)
+(put 'occur-mode 'mode-class 'special)

 
 (defun occur-mode ()
   "Major mode for output from \\[occur].
 
 (defun occur-mode ()
   "Major mode for output from \\[occur].

-Move point to one of the occurrences in this buffer,
-then use \\[occur-mode-goto-occurrence] to go to the same occurrence
-in the buffer that the occurrences were found in.
+\\<occur-mode-map>Move point to one of the items in this buffer, then use
+\\[occur-mode-goto-occurrence] to go to the occurrence that the item refers to.
+Alternatively, click \\[occur-mode-mouse-goto] on an item to go to it.
+

 \\{occur-mode-map}"
   (kill-all-local-variables)
   (use-local-map occur-mode-map)
   (setq major-mode 'occur-mode)
   (setq mode-name "Occur")
 \\{occur-mode-map}"
   (kill-all-local-variables)
   (use-local-map occur-mode-map)
   (setq major-mode 'occur-mode)
   (setq mode-name "Occur")

+  (make-local-variable 'revert-buffer-function)
+  (setq revert-buffer-function 'occur-revert-function)

   (make-local-variable 'occur-buffer)
   (make-local-variable 'occur-nlines)
   (make-local-variable 'occur-buffer)
   (make-local-variable 'occur-nlines)

-  (make-local-variable 'occur-pos-list))
+  (make-local-variable 'occur-command-arguments)
+  (run-hooks 'occur-mode-hook))

 
 

-(defun occur-mode-goto-occurrence ()
-  "Go to the line this occurrence was found in, in the buffer it was found in."
-  (interactive)
+;; Handle revert-buffer for *Occur* buffers.
+(defun occur-revert-function (ignore1 ignore2)
+  (let ((args occur-command-arguments ))
+    (save-excursion
+      (set-buffer occur-buffer)
+      (apply 'occur args))))
+
+(defun occur-mode-mouse-goto (event)
+  "In Occur mode, go to the occurrence whose line you click on."
+  (interactive "e")
+  (let (buffer pos)
+    (save-excursion
+      (set-buffer (window-buffer (posn-window (event-end event))))
+      (save-excursion
+       (goto-char (posn-point (event-end event)))
+       (setq pos (occur-mode-find-occurrence))
+       (setq buffer occur-buffer)))
+    (pop-to-buffer buffer)
+    (goto-char (marker-position pos))))
+
+(defun occur-mode-find-occurrence ()

   (if (or (null occur-buffer)
          (null (buffer-name occur-buffer)))
       (progn
   (if (or (null occur-buffer)
          (null (buffer-name occur-buffer)))
       (progn

-       (setq occur-buffer nil
-             occur-pos-list nil)
+       (setq occur-buffer nil)

        (error "Buffer in which occurrences were found is deleted")))
        (error "Buffer in which occurrences were found is deleted")))

-  (let* ((occur-number (save-excursion
-                        (beginning-of-line)
-                        (/ (1- (count-lines (point-min)
-                                            (save-excursion
-                                              (beginning-of-line)
-                                              (point))))
-                           (cond ((< occur-nlines 0)
-                                  (- 2 occur-nlines))
-                                 ((> occur-nlines 0)
-                                  (+ 2 (* 2 occur-nlines)))
-                                 (t 1)))))
-        (pos (nth occur-number occur-pos-list)))
+  (let ((pos (get-text-property (point) 'occur)))
+    (if (null pos)
+       (error "No occurrence on this line")
+      pos)))
+
+(defun occur-mode-goto-occurrence ()
+  "Go to the occurrence the current line describes."
+  (interactive)
+  (let ((pos (occur-mode-find-occurrence)))

     (pop-to-buffer occur-buffer)
     (goto-char (marker-position pos))))
     (pop-to-buffer occur-buffer)
     (goto-char (marker-position pos))))

+
+(defun occur-next (&optional n)
+  "Move to the Nth (default 1) next match in the *Occur* buffer."
+  (interactive "p")
+  (if (not n) (setq n 1))
+  (let ((r))
+    (while (> n 0)
+      (if (get-text-property (point) 'occur-point)
+         (forward-char 1))
+      (setq r (next-single-property-change (point) 'occur-point))
+      (if r
+         (goto-char r)
+       (error "no more matches"))
+      (setq n (1- n)))))
+
+
+
+(defun occur-prev (&optional n)
+  "Move to the Nth (default 1) previous match in the *Occur* buffer."
+  (interactive "p")
+  (if (not n) (setq n 1))
+  (let ((r))
+    (while (> n 0)
+    
+      (setq r (get-text-property (point) 'occur-point))
+      (if r (forward-char -1))
+      
+      (setq r (previous-single-property-change (point) 'occur-point))
+      (if r
+         (goto-char (- r 1))
+       (error "no earlier matches"))
+      
+      (setq n (1- n)))))

 \f
 \f

-(defvar list-matching-lines-default-context-lines 0
+(defcustom list-matching-lines-default-context-lines 0

   "*Default number of context lines to include around a `list-matching-lines'
 match.  A negative number means to include that many lines before the match.
   "*Default number of context lines to include around a `list-matching-lines'
 match.  A negative number means to include that many lines before the match.

-A positive number means to include that many lines both before and after.")
+A positive number means to include that many lines both before and after."
+  :type 'integer
+  :group 'matching)

 
 (defalias 'list-matching-lines 'occur)
 
 
 (defalias 'list-matching-lines 'occur)
 

+(defvar list-matching-lines-face 'bold
+  "*Face used by M-x list-matching-lines to show the text that matches.
+If the value is nil, don't highlight the matching portions specially.")
+

 (defun occur (regexp &optional nlines)
   "Show all lines in the current buffer containing a match for REGEXP.
 
 (defun occur (regexp &optional nlines)
   "Show all lines in the current buffer containing a match for REGEXP.
 


@@ -272,104 +413,223 @@ Interactively it is the prefix arg.
 
 The lines are shown in a buffer named `*Occur*'.
 It serves as a menu to find any of the occurrences in this buffer.
 
 The lines are shown in a buffer named `*Occur*'.
 It serves as a menu to find any of the occurrences in this buffer.

-\\[describe-mode] in that buffer will explain how."
-  (interactive (list (let* ((default (car regexp-history))
-                           (input 
-                            (read-from-minibuffer
-                             (format "List lines matching regexp (default `%s'): " default)
-                             nil nil nil
-                             'regexp-history)))
-                      (if (> (length input) 0) input
-                        (setcar regexp-history default)))
-                    current-prefix-arg))
-  (setq nlines (if nlines (prefix-numeric-value nlines)
-                list-matching-lines-default-context-lines))
-  (let ((first t)
+\\<occur-mode-map>\\[describe-mode] in that buffer will explain how.
+
+If REGEXP contains upper case characters (excluding those preceded by `\\'),
+the matching is case-sensitive."
+  (interactive
+   (list (let* ((default (car regexp-history))
+               (input
+                (read-from-minibuffer
+                 (if default
+                     (format "List lines matching regexp (default `%s'): "
+                             default)
+                   "List lines matching regexp: ")
+                 nil nil nil 'regexp-history default t)))
+          (and (equal input "") default
+               (setq input default))
+          input)
+        current-prefix-arg))
+  (let ((nlines (if nlines
+                   (prefix-numeric-value nlines)
+                 list-matching-lines-default-context-lines))
+       (first t)
+       ;;flag to prevent printing separator for first match
+       (occur-num-matches 0)

        (buffer (current-buffer))
        (buffer (current-buffer))

+       (dir default-directory)

        (linenum 1)
        (linenum 1)

-       (prevpos (point-min))
-       (final-context-start (make-marker)))
+       (prevpos 
+        ;;position of most recent match
+        (point-min))
+       (case-fold-search  (and case-fold-search
+                               (isearch-no-upper-case-p regexp t)))
+       (final-context-start
+        ;; Marker to the start of context immediately following
+        ;; the matched text in *Occur*.
+        (make-marker)))

 ;;;    (save-excursion
 ;;;      (beginning-of-line)
 ;;;      (setq linenum (1+ (count-lines (point-min) (point))))
 ;;;      (setq prevpos (point)))
 ;;;    (save-excursion
 ;;;      (beginning-of-line)
 ;;;      (setq linenum (1+ (count-lines (point-min) (point))))
 ;;;      (setq prevpos (point)))

-    (with-output-to-temp-buffer "*Occur*"
-      (save-excursion
-       (set-buffer standard-output)
-       (insert "Lines matching ")
-       (prin1 regexp)
-       (insert " in buffer " (buffer-name buffer) ?. ?\n)
-       (occur-mode)
-       (setq occur-buffer buffer)
-       (setq occur-nlines nlines)
-       (setq occur-pos-list ()))
-      (if (eq buffer standard-output)
-         (goto-char (point-max)))
-      (save-excursion
-       (beginning-of-buffer)
-       ;; Find next match, but give up if prev match was at end of buffer.
-       (while (and (not (= prevpos (point-max)))
-                   (re-search-forward regexp nil t))
-         (goto-char (match-beginning 0))
-         (beginning-of-line)
-         (save-match-data
-           (setq linenum (+ linenum (count-lines prevpos (point)))))
-         (setq prevpos (point))
-         (goto-char (match-end 0))
-         (let* ((start (save-excursion
-                         (goto-char (match-beginning 0))
-                         (forward-line (if (< nlines 0) nlines (- nlines)))
-                         (point)))
-                (end (save-excursion
+    (save-excursion
+      (goto-char (point-min))
+      ;; Check first whether there are any matches at all.
+      (if (not (re-search-forward regexp nil t))
+         (message "No matches for `%s'" regexp)
+       ;; Back up, so the search loop below will find the first match.
+       (goto-char (match-beginning 0))
+       (with-output-to-temp-buffer "*Occur*"
+         (save-excursion
+           (set-buffer standard-output)
+           (setq default-directory dir)
+           ;; We will insert the number of lines, and "lines", later.
+           (insert " matching ")
+           (let ((print-escape-newlines t))
+             (prin1 regexp))
+           (insert " in buffer " (buffer-name buffer) ?. ?\n)
+           (occur-mode)
+           (setq occur-buffer buffer)
+           (setq occur-nlines nlines)
+           (setq occur-command-arguments
+                 (list regexp nlines)))
+         (if (eq buffer standard-output)
+             (goto-char (point-max)))
+         (save-excursion
+           ;; Find next match, but give up if prev match was at end of buffer.
+           (while (and (not (= prevpos (point-max)))
+                       (re-search-forward regexp nil t))
+             (goto-char (match-beginning 0))
+             (beginning-of-line)
+             (save-match-data
+               (setq linenum (+ linenum (count-lines prevpos (point)))))
+             (setq prevpos (point))
+             (goto-char (match-end 0))
+             (let* ((start
+                     ;;start point of text in source buffer to be put
+                     ;;into *Occur*
+                     (save-excursion
+                             (goto-char (match-beginning 0))
+                             (forward-line (if (< nlines 0)
+                                               nlines
+                                             (- nlines)))
+                             (point)))
+                    (end       
+                     ;; end point of text in source buffer to be put
+                     ;; into *Occur*
+                     (save-excursion 

                        (goto-char (match-end 0))
                        (if (> nlines 0)
                            (forward-line (1+ nlines))
                        (goto-char (match-end 0))
                        (if (> nlines 0)
                            (forward-line (1+ nlines))

-                           (forward-line 1))
+                         (forward-line 1))

                        (point)))
                        (point)))

-                (tag (format "%3d" linenum))
-                (empty (make-string (length tag) ?\ ))
-                tem)
-           (save-excursion
-             (setq tem (make-marker))
-             (set-marker tem (point))
-             (set-buffer standard-output)
-             (setq occur-pos-list (cons tem occur-pos-list))
-             (or first (zerop nlines)
-                 (insert "--------\n"))
-             (setq first nil)
-             (insert-buffer-substring buffer start end)
-             (backward-char (- end start))
-             (setq tem nlines)
-             (while (> tem 0)
-               (insert empty ?:)
-               (forward-line 1)
-               (setq tem (1- tem)))
-             (let ((this-linenum linenum))
-               (set-marker final-context-start
-                           (+ (point) (- (match-end 0) (match-beginning 0))))
-               (while (< (point) final-context-start)
-                 (if (null tag)
-                     (setq tag (format "%3d" this-linenum)))
-                 (insert tag ?:)
-                 (setq tag nil)
-                 (forward-line 1)
-                 (setq this-linenum (1+ this-linenum))))
-             (while (< tem nlines)
-               (insert empty ?:)
-               (forward-line 1)
-               (setq tem (1+ tem))))                           
-           (forward-line 1)))
-       (set-buffer standard-output)
-       ;; Put positions in increasing order to go with buffer.
-       (setq occur-pos-list (nreverse occur-pos-list))
-       (if (interactive-p)
-           (message "%d matching lines." (length occur-pos-list)))))))
+                    (match-beg
+                     ;; Amount of context before matching text
+                     (- (match-beginning 0) start))
+                    (match-len         
+                     ;; Length of matching text
+                     (- (match-end 0) (match-beginning 0)))
+                    (tag (format "%5d" linenum))
+                    (empty (make-string (length tag) ?\ ))
+                    tem                
+                    insertion-start
+                    ;; Number of lines of context to show for current match.
+                    occur-marker       
+                    ;; Marker pointing to end of match in source buffer.
+                    (text-beg
+                     ;; Marker pointing to start of text for one
+                     ;; match in *Occur*.
+                     (make-marker))
+                    (text-end 
+                     ;; Marker pointing to end of text for one match
+                     ;; in *Occur*.
+                     (make-marker))
+                    )
+               (save-excursion
+                 (setq occur-marker (make-marker))
+                 (set-marker occur-marker (point))
+                 (set-buffer standard-output)
+                 (setq occur-num-matches (1+ occur-num-matches))
+                 (or first (zerop nlines)
+                     (insert "--------\n"))
+                 (setq first nil)
+
+                 ;; Insert matching text including context lines from
+                 ;; source buffer into *Occur*
+                 (set-marker text-beg (point))
+                 (setq insertion-start (point))
+                 (insert-buffer-substring buffer start end)
+                 (or (and (/= (+ start match-beg) end)
+                          (with-current-buffer buffer
+                            (eq (char-before end) ?\n)))
+                     (insert "\n"))
+                 (set-marker final-context-start 
+                             (+ (- (point) (- end (match-end 0)))
+                                (if (save-excursion
+                                      (set-buffer buffer)
+                                      (save-excursion
+                                        (goto-char (match-end 0))
+                                        (end-of-line)
+                                        (bolp)))
+                                    1 0)))
+                 (set-marker text-end (point))
+                 
+                 ;; Highlight text that was matched.
+                 (if list-matching-lines-face
+                     (put-text-property
+                      (+ (marker-position text-beg) match-beg)
+                      (+ (marker-position text-beg) match-beg match-len)
+                      'face list-matching-lines-face))
+
+                 ;; `occur-point' property is used by occur-next and
+                 ;; occur-prev to move between matching lines.
+                 (put-text-property
+                  (+ (marker-position text-beg) match-beg match-len)
+                  (+ (marker-position text-beg) match-beg match-len 1)
+                  'occur-point t)
+                 
+                 ;; Now go back to the start of the matching text
+                 ;; adding the space and colon to the start of each line.
+                 (goto-char insertion-start)
+                 ;; Insert space and colon for lines of context before match.
+                 (setq tem (if (< linenum nlines)
+                               (- nlines linenum)
+                             nlines))
+                 (while (> tem 0)
+                   (insert empty ?:)
+                   (forward-line 1)
+                   (setq tem (1- tem)))
+
+                 ;; Insert line number and colon for the lines of
+                 ;; matching text.
+                 (let ((this-linenum linenum))
+                   (while (< (point) final-context-start)
+                     (if (null tag)
+                         (setq tag (format "%5d" this-linenum)))
+                     (insert tag ?:)
+                     (forward-line 1)
+                     (setq tag nil)
+                     (setq this-linenum (1+ this-linenum)))
+                   (while (and (not (eobp)) (<= (point) final-context-start))
+                     (insert empty ?:)
+                     (forward-line 1)
+                     (setq this-linenum (1+ this-linenum))))
+
+                 ;; Insert space and colon for lines of context after match.
+                 (while (and (< (point) (point-max)) (< tem nlines))
+                   (insert empty ?:)
+                   (forward-line 1)
+                   (setq tem (1+ tem)))
+                 
+                 ;; Add text properties.  The `occur' prop is used to
+                 ;; store the marker of the matching text in the
+                 ;; source buffer.
+                 (put-text-property (marker-position text-beg)
+                                    (- (marker-position text-end) 1)
+                                    'mouse-face 'highlight)
+                 (put-text-property (marker-position text-beg)
+                                    (marker-position text-end)
+                                    'occur occur-marker)
+                 (goto-char (point-max)))
+               (forward-line 1)))
+           (set-buffer standard-output)
+           ;; Go back to top of *Occur* and finish off by printing the
+           ;; number of matching lines.
+           (goto-char (point-min))
+           (let ((message-string
+                  (if (= occur-num-matches 1)
+                      "1 line"
+                    (format "%d lines" occur-num-matches))))
+             (insert message-string)
+             (if (interactive-p)
+                 (message "%s matched" message-string)))
+           (setq buffer-read-only t)))))))

 \f
 ;; It would be nice to use \\[...], but there is no reasonable way
 ;; to make that display both SPC and Y.
 (defconst query-replace-help
   "Type Space or `y' to replace one match, Delete or `n' to skip to next,
 \f
 ;; It would be nice to use \\[...], but there is no reasonable way
 ;; to make that display both SPC and Y.
 (defconst query-replace-help
   "Type Space or `y' to replace one match, Delete or `n' to skip to next,

-ESC or `q' to exit, Period to replace one match and exit,
+RET or `q' to exit, Period to replace one match and exit,

 Comma to replace but not move point immediately,
 C-r to enter recursive edit (\\[exit-recursive-edit] to get out again),
 C-w to delete match and recursive edit,
 Comma to replace but not move point immediately,
 C-r to enter recursive edit (\\[exit-recursive-edit] to get out again),
 C-w to delete match and recursive edit,


@@ -383,7 +643,7 @@ C-l to clear the screen, redisplay, and offer same replacement again,
 The \"bindings\" in this map are not commands; they are answers.
 The valid answers include `act', `skip', `act-and-show',
 `exit', `act-and-exit', `edit', `delete-and-edit', `recenter',
 The \"bindings\" in this map are not commands; they are answers.
 The valid answers include `act', `skip', `act-and-show',
 `exit', `act-and-exit', `edit', `delete-and-edit', `recenter',

-`automatic', `backup', and `help'.")
+`automatic', `backup', `exit-prefix', and `help'.")

 
 (define-key query-replace-map " " 'act)
 (define-key query-replace-map "\d" 'skip)
 
 (define-key query-replace-map " " 'act)
 (define-key query-replace-map "\d" 'skip)


@@ -391,12 +651,12 @@ The valid answers include `act', `skip', `act-and-show',
 (define-key query-replace-map [backspace] 'skip)
 (define-key query-replace-map "y" 'act)
 (define-key query-replace-map "n" 'skip)
 (define-key query-replace-map [backspace] 'skip)
 (define-key query-replace-map "y" 'act)
 (define-key query-replace-map "n" 'skip)

+(define-key query-replace-map "Y" 'act)
+(define-key query-replace-map "N" 'skip)

 (define-key query-replace-map "," 'act-and-show)
 (define-key query-replace-map "," 'act-and-show)

-(define-key query-replace-map "\e" 'exit)
-(define-key query-replace-map [escape] 'exit)

 (define-key query-replace-map "q" 'exit)
 (define-key query-replace-map "\r" 'exit)
 (define-key query-replace-map "q" 'exit)
 (define-key query-replace-map "\r" 'exit)

-(define-key query-replace-map "[return]" 'exit)
+(define-key query-replace-map [return] 'exit)

 (define-key query-replace-map "." 'act-and-exit)
 (define-key query-replace-map "\C-r" 'edit)
 (define-key query-replace-map "\C-w" 'delete-and-edit)
 (define-key query-replace-map "." 'act-and-exit)
 (define-key query-replace-map "\C-r" 'edit)
 (define-key query-replace-map "\C-w" 'delete-and-edit)


@@ -404,9 +664,13 @@ The valid answers include `act', `skip', `act-and-show',
 (define-key query-replace-map "!" 'automatic)
 (define-key query-replace-map "^" 'backup)
 (define-key query-replace-map "\C-h" 'help)
 (define-key query-replace-map "!" 'automatic)
 (define-key query-replace-map "^" 'backup)
 (define-key query-replace-map "\C-h" 'help)

+(define-key query-replace-map [f1] 'help)
+(define-key query-replace-map [help] 'help)

 (define-key query-replace-map "?" 'help)
 (define-key query-replace-map "\C-g" 'quit)
 (define-key query-replace-map "\C-]" 'quit)
 (define-key query-replace-map "?" 'help)
 (define-key query-replace-map "\C-g" 'quit)
 (define-key query-replace-map "\C-]" 'quit)

+(define-key query-replace-map "\e" 'exit-prefix)
+(define-key query-replace-map [escape] 'exit-prefix)

 
 (defun perform-replace (from-string replacements
                        query-flag regexp-flag delimited-flag
 
 (defun perform-replace (from-string replacements
                        query-flag regexp-flag delimited-flag


@@ -416,8 +680,10 @@ Don't use this in your own program unless you want to query and set the mark
 just as `query-replace' does.  Instead, write a simple loop like this:
   (while (re-search-forward \"foo[ \t]+bar\" nil t)
     (replace-match \"foobar\" nil nil))
 just as `query-replace' does.  Instead, write a simple loop like this:
   (while (re-search-forward \"foo[ \t]+bar\" nil t)
     (replace-match \"foobar\" nil nil))

-which will run faster and do exactly what you probably want."
+which will run faster and probably do exactly what you want."

   (or map (setq map query-replace-map))
   (or map (setq map query-replace-map))

+  (and query-flag minibuffer-auto-raise
+       (raise-frame (window-frame (minibuffer-window))))

   (let ((nocasify (not (and case-fold-search case-replace
                            (string-equal from-string
                                          (downcase from-string)))))
   (let ((nocasify (not (and case-fold-search case-replace
                            (string-equal from-string
                                          (downcase from-string)))))


@@ -431,8 +697,26 @@ which will run faster and do exactly what you probably want."
        (stack nil)
        (next-rotate-count 0)
        (replace-count 0)
        (stack nil)
        (next-rotate-count 0)
        (replace-count 0)

-       (lastrepl nil)                  ;Position after last match considered.
-       (match-again t))
+       (nonempty-match nil)
+
+       ;; If non-nil, it is marker saying where in the buffer to stop.
+       (limit nil)
+
+       ;; Data for the next match.  If a cons, it has the same format as
+       ;; (match-data); otherwise it is t if a match is possible at point.
+       (match-again t)
+
+       (message
+        (if query-flag
+            (substitute-command-keys
+             "Query replacing %s with %s: (\\<query-replace-map>\\[help] for help) "))))
+
+    ;; If region is active, in Transient Mark mode, operate on region.
+    (if (and transient-mark-mode mark-active)
+       (progn
+         (setq limit (copy-marker (region-end)))
+         (goto-char (region-beginning))
+         (deactivate-mark)))

     (if (stringp replacements)
        (setq next-replacement replacements)
       (or repeat-count (setq repeat-count 1)))
     (if (stringp replacements)
        (setq next-replacement replacements)
       (or repeat-count (setq repeat-count 1)))


@@ -444,133 +728,191 @@ which will run faster and do exactly what you probably want."
                                    "\\b")))
     (push-mark)
     (undo-boundary)
                                    "\\b")))
     (push-mark)
     (undo-boundary)

-    ;; Loop finding occurrences that perhaps should be replaced.
-    (while (and keep-going
-               (not (eobp))
-               (funcall search-function search-string nil t)
-               ;; If the search string matches immediately after
-               ;; the previous match, but it did not match there
-               ;; before the replacement was done, ignore the match.
-               (if (or (eq lastrepl (point))
-                       (and regexp-flag
-                            (eq lastrepl (match-beginning 0))
-                            (not match-again)))
-                   (if (eobp)
-                       nil
-                     ;; Don't replace the null string 
-                     ;; right after end of previous replacement.
-                     (forward-char 1)
-                     (funcall search-function search-string nil t))
-                 t))
-
-      ;; Save the data associated with the real match.
-      (setq real-match-data (match-data))
-
-      ;; Before we make the replacement, decide whether the search string
-      ;; can match again just after this match.
-      (if regexp-flag
-         (setq match-again (looking-at search-string)))
-      ;; If time for a change, advance to next replacement string.
-      (if (and (listp replacements)
-              (= next-rotate-count replace-count))
-         (progn
-           (setq next-rotate-count
-                 (+ next-rotate-count repeat-count))
-           (setq next-replacement (nth replacement-index replacements))
-           (setq replacement-index (% (1+ replacement-index) (length replacements)))))
-      (if (not query-flag)
-         (progn
-           (store-match-data real-match-data)
-           (replace-match next-replacement nocasify literal)
-           (setq replace-count (1+ replace-count)))
-       (undo-boundary)
-       (let (done replaced key def)
-         ;; Loop reading commands until one of them sets done,
-         ;; which means it has finished handling this occurrence.
-         (while (not done)
-           (message "Query replacing %s with %s: "
-                    from-string next-replacement)
-           (setq key (read-event))
-           (setq key (vector key))
-           (setq def (lookup-key map key))
-           ;; Restore the match data while we process the command.
-           (store-match-data real-match-data)
-           (cond ((eq def 'help)
-                  (with-output-to-temp-buffer "*Help*"
-                    (princ
-                     (concat "Query replacing "
-                             (if regexp-flag "regexp " "")
-                             from-string " with "
-                             next-replacement ".\n\n"
-                             (substitute-command-keys
-                              query-replace-help)))))
-                 ((eq def 'exit)
-                  (setq keep-going nil)
-                  (setq done t))
-                 ((eq def 'backup)
-                  (let ((elt (car stack)))
-                    (goto-char (car elt))
-                    (setq replaced (eq t (cdr elt)))
-                    (or replaced
-                        (store-match-data (cdr elt)))
-                    (setq stack (cdr stack))))              
-                 ((eq def 'act)
-                  (or replaced
-                      (replace-match next-replacement nocasify literal))
-                  (setq done t replaced t))
-                 ((eq def 'act-and-exit)
-                  (or replaced
-                      (replace-match next-replacement nocasify literal))
-                  (setq keep-going nil)
-                  (setq done t replaced t))
-                 ((eq def 'act-and-show)
-                  (if (not replaced)
-                      (progn
-                        (replace-match next-replacement nocasify literal)
-                        (setq replaced t))))
-                 ((eq def 'automatic)
-                  (or replaced
-                      (replace-match next-replacement nocasify literal))
-                  (setq done t query-flag nil replaced t))
-                 ((eq def 'skip)
-                  (setq done t))
-                 ((eq def 'recenter)
-                  (recenter nil))
-                 ((eq def 'edit)
-                  (store-match-data
-                   (prog1 (match-data)
-                     (save-excursion (recursive-edit))))
-                  ;; Before we make the replacement,
-                  ;; decide whether the search string
-                  ;; can match again just after this match.
-                  (if regexp-flag
-                      (setq match-again (looking-at search-string))))
-                 ((eq def 'delete-and-edit)
-                  (delete-region (match-beginning 0) (match-end 0))
-                  (store-match-data
-                   (prog1 (match-data)
-                     (save-excursion (recursive-edit))))
-                  (setq replaced t))
-                 (t
-                  (setq keep-going nil)
-                  (setq unread-command-events
-                        (append (listify-key-sequence key)
-                                unread-command-events))
-                  (setq done t))))
-         ;; Record previous position for ^ when we move on.
-         ;; Change markers to numbers in the match data
-         ;; since lots of markers slow down editing.
-         (setq stack
-               (cons (cons (point)
-                           (or replaced
-                               (mapcar
-                                (function (lambda (elt)
-                                            (and elt
-                                                 (marker-position elt))))
-                                (match-data))))
-                     stack))
-         (if replaced (setq replace-count (1+ replace-count)))))
-      (setq lastrepl (point)))
-  (and keep-going stack)))
+    (unwind-protect
+       ;; Loop finding occurrences that perhaps should be replaced.
+       (while (and keep-going
+                   (not (eobp))
+                   ;; Use the next match if it is already known;
+                   ;; otherwise, search for a match after moving forward
+                   ;; one char if progress is required.
+                   (setq real-match-data
+                         (if (consp match-again)
+                             (progn (goto-char (nth 1 match-again))
+                                    match-again)
+                           (and (or match-again
+                                    (progn
+                                      (forward-char 1)
+                                      (not (eobp))))
+                                (funcall search-function search-string limit t)
+                                ;; For speed, use only integers and
+                                ;; reuse the list used last time.
+                                (match-data t real-match-data)))))
+
+         ;; Record whether the match is nonempty, to avoid an infinite loop
+         ;; repeatedly matching the same empty string.
+         (setq nonempty-match
+               (/= (nth 0 real-match-data) (nth 1 real-match-data)))
+
+         ;; If the match is empty, record that the next one can't be adjacent.
+         ;; Otherwise, if matching a regular expression, do the next
+         ;; match now, since the replacement for this match may
+         ;; affect whether the next match is adjacent to this one.
+         (setq match-again
+               (and nonempty-match
+                    (or (not regexp-flag)
+                        (and (looking-at search-string)
+                             (match-data)))))
+
+         ;; If time for a change, advance to next replacement string.
+         (if (and (listp replacements)
+                  (= next-rotate-count replace-count))
+             (progn
+               (setq next-rotate-count
+                     (+ next-rotate-count repeat-count))
+               (setq next-replacement (nth replacement-index replacements))
+               (setq replacement-index (% (1+ replacement-index) (length replacements)))))
+         (if (not query-flag)
+             (progn
+               (set-match-data real-match-data)
+               (replace-match next-replacement nocasify literal)
+               (setq replace-count (1+ replace-count)))
+           (undo-boundary)
+           (let (done replaced key def)
+             ;; Loop reading commands until one of them sets done,
+             ;; which means it has finished handling this occurrence.
+             (while (not done)
+               (set-match-data real-match-data)
+               (replace-highlight (match-beginning 0) (match-end 0))
+               ;; Bind message-log-max so we don't fill up the message log
+               ;; with a bunch of identical messages.
+               (let ((message-log-max nil))
+                 (message message from-string next-replacement))
+               (setq key (read-event))
+               ;; Necessary in case something happens during read-event
+               ;; that clobbers the match data.
+               (set-match-data real-match-data)
+               (setq key (vector key))
+               (setq def (lookup-key map key))
+               ;; Restore the match data while we process the command.
+               (cond ((eq def 'help)
+                      (with-output-to-temp-buffer "*Help*"
+                        (princ
+                         (concat "Query replacing "
+                                 (if regexp-flag "regexp " "")
+                                 from-string " with "
+                                 next-replacement ".\n\n"
+                                 (substitute-command-keys
+                                  query-replace-help)))
+                        (save-excursion
+                          (set-buffer standard-output)
+                          (help-mode))))
+                     ((eq def 'exit)
+                      (setq keep-going nil)
+                      (setq done t))
+                     ((eq def 'backup)
+                      (if stack
+                          (let ((elt (car stack)))
+                            (goto-char (car elt))
+                            (setq replaced (eq t (cdr elt)))
+                            (or replaced
+                                (set-match-data (cdr elt)))
+                            (setq stack (cdr stack)))
+                        (message "No previous match")
+                        (ding 'no-terminate)
+                        (sit-for 1)))
+                     ((eq def 'act)
+                      (or replaced
+                          (progn
+                            (replace-match next-replacement nocasify literal)
+                            (setq replace-count (1+ replace-count))))
+                      (setq done t replaced t))
+                     ((eq def 'act-and-exit)
+                      (or replaced
+                          (progn
+                            (replace-match next-replacement nocasify literal)
+                            (setq replace-count (1+ replace-count))))
+                      (setq keep-going nil)
+                      (setq done t replaced t))
+                     ((eq def 'act-and-show)
+                      (if (not replaced)
+                          (progn
+                            (replace-match next-replacement nocasify literal)
+                            (setq replace-count (1+ replace-count))
+                            (setq replaced t))))
+                     ((eq def 'automatic)
+                      (or replaced
+                          (progn
+                            (replace-match next-replacement nocasify literal)
+                            (setq replace-count (1+ replace-count))))
+                      (setq done t query-flag nil replaced t))
+                     ((eq def 'skip)
+                      (setq done t))
+                     ((eq def 'recenter)
+                      (recenter nil))
+                     ((eq def 'edit)
+                      (goto-char (match-beginning 0))
+                      (funcall search-function search-string limit t)
+                      (setq real-match-data (match-data))
+                      (save-excursion (recursive-edit))
+                      (set-match-data real-match-data)
+                      ;; Before we make the replacement,
+                      ;; decide whether the search string
+                      ;; can match again just after this match.
+                      (if (and regexp-flag nonempty-match)
+                          (setq match-again (and (looking-at search-string)
+                                                 (match-data)))))
+                     ((eq def 'delete-and-edit)
+                      (delete-region (match-beginning 0) (match-end 0))
+                      (set-match-data
+                       (prog1 (match-data)
+                         (save-excursion (recursive-edit))))
+                      (setq replaced t))
+                     ;; Note: we do not need to treat `exit-prefix'
+                     ;; specially here, since we reread
+                     ;; any unrecognized character.
+                     (t
+                      (setq this-command 'mode-exited)
+                      (setq keep-going nil)
+                      (setq unread-command-events
+                            (append (listify-key-sequence key)
+                                    unread-command-events))
+                      (setq done t))))
+             ;; Record previous position for ^ when we move on.
+             ;; Change markers to numbers in the match data
+             ;; since lots of markers slow down editing.
+             (setq stack
+                   (cons (cons (point)
+                               (or replaced (match-data t)))
+                         stack)))))
+      (replace-dehighlight))
+    (or unread-command-events
+       (message "Replaced %d occurrence%s"
+                replace-count
+                (if (= replace-count 1) "" "s")))
+    (and keep-going stack)))
+
+(defcustom query-replace-highlight t
+  "*Non-nil means to highlight words during query replacement."
+  :type 'boolean
+  :group 'matching)
+
+(defvar replace-overlay nil)
+
+(defun replace-dehighlight ()
+  (and replace-overlay
+       (progn
+        (delete-overlay replace-overlay)
+        (setq replace-overlay nil))))
+
+(defun replace-highlight (start end)
+  (and query-replace-highlight
+       (progn
+        (or replace-overlay
+            (progn
+              (setq replace-overlay (make-overlay start end))
+              (overlay-put replace-overlay 'face
+                           (if (internal-find-face 'query-replace)
+                               'query-replace 'region))))
+        (move-overlay replace-overlay start end (current-buffer)))))

 
 ;;; replace.el ends here
 
 ;;; replace.el ends here