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+;; Replace commands for Emacs.
+;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; 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.
+
+
+(fset 'delete-non-matching-lines 'keep-lines)
+(defun keep-lines (regexp)
+  "Delete all lines except those containing matches for REGEXP.
+A match split across lines preserves all the lines it lies in.
+Applies to all lines after point."
+  (interactive "sKeep lines (containing match for regexp): ")
+  (save-excursion
+    (or (bolp) (forward-line 1))
+    (let ((start (point)))
+      (while (not (eobp))
+        ;; Start is first char not preserved by previous match.
+        (if (not (re-search-forward regexp nil 'move))
+            (delete-region start (point-max))
+          (let ((end (save-excursion (goto-char (match-beginning 0))
+                                     (beginning-of-line)
+                                     (point))))
+            ;; Now end is first char preserved by the new match.
+            (if (< start end)
+                (delete-region start end))))
+        (setq start (save-excursion (forward-line 1)
+                                    (point)))
+        ;; If the match was empty, avoid matching again at same place.
+        (and (not (eobp)) (= (match-beginning 0) (match-end 0))
+             (forward-char 1))))))
+
+(fset 'delete-matching-lines 'flush-lines)
+(defun flush-lines (regexp)
+  "Delete lines containing matches for REGEXP.
+If a match is split across lines, all the lines it lies in are deleted.
+Applies to lines after point."
+  (interactive "sFlush lines (containing match for regexp): ")
+  (save-excursion
+    (while (and (not (eobp))
+                (re-search-forward regexp nil t))
+      (delete-region (save-excursion (goto-char (match-beginning 0))
+                                     (beginning-of-line)
+                                     (point))
+                     (progn (forward-line 1) (point))))))
+
+(fset 'count-matches 'how-many)
+(defun how-many (regexp)
+  "Print number of matches for REGEXP following point."
+  (interactive "sHow many matches for (regexp): ")
+  (let ((count 0) opoint)
+    (save-excursion
+     (while (and (not (eobp))
+                 (progn (setq opoint (point))
+                        (re-search-forward regexp nil t)))
+       (if (= opoint (point))
+           (forward-char 1)
+         (setq count (1+ count))))
+     (message "%d occurrences" count))))
+
+(defvar occur-mode-map ())
+(if occur-mode-map
+    ()
+  (setq occur-mode-map (make-sparse-keymap))
+  (define-key occur-mode-map "\C-c\C-c" 'occur-mode-goto-occurrence))
+
+(defvar occur-buffer nil)
+(defvar occur-nlines nil)
+(defvar occur-pos-list nil)
+
+(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}"
+  (kill-all-local-variables)
+  (use-local-map occur-mode-map)
+  (setq major-mode 'occur-mode)
+  (setq mode-name "Occur")
+  (make-local-variable 'occur-buffer)
+  (make-local-variable 'occur-nlines)
+  (make-local-variable 'occur-pos-list))
+
+(defun occur-mode-goto-occurrence ()
+  "Go to the line this occurrence was found in, in the buffer it was found in."
+  (interactive)
+  (if (or (null occur-buffer)
+          (null (buffer-name occur-buffer)))
+      (progn
+        (setq occur-buffer nil
+              occur-pos-list nil)
+        (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)))
+    (pop-to-buffer occur-buffer)
+    (goto-char (marker-position pos))))
+
+(defvar 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.
+A positive number means to include that many lines both before and after.")
+
+(defvar occur-whole-buffer nil
+  "If t, occur operates on whole buffer, otherwise occur starts from point.
+default is nil.")
+
+(fset 'list-matching-lines 'occur)
+
+(defun occur (regexp &optional nlines)
+  "Show lines  containing a match for REGEXP.  If the global variable
+occur-whole-buffer is non-nil, the entire buffer is searched, otherwise
+search begins at point.
+
+Each line is displayed with NLINES lines before and after,
+ or -NLINES before if NLINES is negative.
+NLINES defaults to list-matching-lines-default-context-lines.
+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.
+\\[describe-mode] in that buffer will explain how."
+  (interactive "sList lines matching regexp: \nP")
+  (setq nlines (if nlines (prefix-numeric-value nlines)
+                 list-matching-lines-default-context-lines))
+  (let ((first t)
+        (buffer (current-buffer))
+        (linenum 1)
+        (prevpos (point-min)))
+    (if (not occur-whole-buffer)
+        (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
+        (if occur-whole-buffer
+            (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))
+          (beginning-of-line)
+          (setq linenum (+ linenum (count-lines prevpos (point))))
+          (setq prevpos (point))
+          (let* ((start (save-excursion
+                          (forward-line (if (< nlines 0) nlines (- nlines)))
+                          (point)))
+                 (end (save-excursion
+                        (if (> nlines 0)
+                            (forward-line (1+ nlines))
+                            (forward-line 1))
+                        (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 (if (< nlines 0) (- nlines) nlines))
+              (while (> tem 0)
+                (insert empty ?:)
+                (forward-line 1)
+                (setq tem (1- tem)))
+              (insert tag ?:)
+              (forward-line 1)
+              (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)))))))
+
+(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,
+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,
+C-l to clear the screen, redisplay, and offer same replacement again,
+! to replace all remaining matches with no more questions,
+^ to move point back to previous match."
+  "Help message while in query-replace")
+
+(defun perform-replace (from-string replacements
+                        query-flag regexp-flag delimited-flag
+                        &optional repeat-count)
+  "Subroutine of `query-replace'.  Its complexity handles interactive queries.
+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))
+which will run faster and do exactly what you probably want."
+  (let ((nocasify (not (and case-fold-search case-replace
+                            (string-equal from-string
+                                          (downcase from-string)))))
+        (literal (not regexp-flag))
+        (search-function (if regexp-flag 're-search-forward 'search-forward))
+        (search-string from-string)
+        (next-replacement nil)
+        (replacement-index 0)
+        (keep-going t)
+        (stack nil)
+        (next-rotate-count 0)
+        (replace-count 0)
+        (lastrepl nil))                 ;Position after last match considered.
+    (if (stringp replacements)
+        (setq next-replacement replacements)
+      (or repeat-count (setq repeat-count 1)))
+    (if delimited-flag
+        (setq search-function 're-search-forward
+              search-string (concat "\\b"
+                                    (if regexp-flag from-string
+                                      (regexp-quote from-string))
+                                    "\\b")))
+    (push-mark)
+    (undo-boundary)
+    (while (and keep-going
+                (not (eobp))
+                (funcall search-function search-string nil t)
+                (if (eq lastrepl (point))
+                    (progn 
+                      ;; Don't replace the null string 
+                      ;; right after end of previous replacement.
+                      (forward-char 1)
+                      (funcall search-function search-string nil t))
+                  t))
+      ;; 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
+            (replace-match next-replacement nocasify literal)
+            (setq replace-count (1+ replace-count)))
+        (undo-boundary)
+        (let (done replaced)
+          (while (not done)
+            ;; Preserve the match data.  Process filters and sentinels
+            ;; could run inside read-char..
+            (let ((data (match-data))
+                  (help-form
+                   '(concat "Query replacing "
+                            (if regexp-flag "regexp " "")
+                            from-string " with " next-replacement ".\n\n"
+                            (substitute-command-keys query-replace-help))))
+              (setq char help-char)
+              (while (or (not (numberp char)) (= char help-char))
+                (message "Query replacing %s with %s: " from-string next-replacement)
+                (setq char (read-event))
+                (if (and (numberp char) (= char ??))
+                    (setq unread-command-char help-char char help-char)))
+              (store-match-data data))
+            (cond ((or (= char ?\e)
+                       (= char ?q))
+                   (setq keep-going nil)
+                   (setq done t))
+                  ((= char ?^)
+                   (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))))              
+                  ((or (= char ?\ )
+                       (= char ?y))
+                   (or replaced
+                       (replace-match next-replacement nocasify literal))
+                   (setq done t replaced t))
+                  ((= char ?\.)
+                   (or replaced
+                       (replace-match next-replacement nocasify literal))
+                   (setq keep-going nil)
+                   (setq done t replaced t))
+                  ((= char ?\,)
+                   (if (not replaced)
+                       (progn
+                         (replace-match next-replacement nocasify literal)
+                         (setq replaced t))))
+                  ((= char ?!)
+                   (or replaced
+                       (replace-match next-replacement nocasify literal))
+                   (setq done t query-flag nil replaced t))
+                  ((or (= char ?\177)
+                       (= char ?n))
+                   (setq done t))
+                  ((= char ?\C-l)
+                   (recenter nil))
+                  ((= char ?\C-r)
+                   (store-match-data
+                    (prog1 (match-data)
+                      (save-excursion (recursive-edit)))))
+                  ((= char ?\C-w)
+                   (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-char char)
+                   (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)))
+
+(defun map-query-replace-regexp (regexp to-strings &optional arg)
+  "Replace some matches for REGEXP with various strings, in rotation.
+The second argument TO-STRINGS contains the replacement strings, separated
+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.
+
+Non-interactively, TO-STRINGS may be a list of replacement strings.
+
+A prefix argument N says to use each replacement string N times
+before rotating to the next."
+  (interactive "sMap query replace (regexp): \nsQuery replace %s with (space-separated strings): \nP")
+  (let (replacements)
+    (if (listp to-strings)
+        (setq replacements to-strings)
+      (while (/= (length to-strings) 0)
+        (if (string-match " " to-strings)
+            (setq replacements
+                  (append replacements
+                          (list (substring to-strings 0
+                                           (string-match " " to-strings))))
+                  to-strings (substring to-strings
+                                       (1+ (string-match " " to-strings))))
+          (setq replacements (append replacements (list to-strings))
+                to-strings ""))))
+    (perform-replace regexp replacements t t nil arg))
+  (message "Done"))
+