--- /dev/null
+;; 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)))))))
+\f
+(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)))
+\f
+(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"))
+
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