;; 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)
;; 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): ")
(or (bolp) (forward-line 1))
;; 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))
;; Now end is first char preserved by the new match.
(delete-region start end))))
(setq start (save-excursion (forward-line 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): ")
(re-search-forward regexp nil t))
(delete-region (save-excursion (goto-char (match-beginning 0))
(progn (forward-line 1) (point))))))
(fset 'count-matches 'how-many)
"Print number of matches for REGEXP following point."
(interactive "sHow many matches for (regexp): ")
(progn (setq opoint (point))
(re-search-forward regexp nil t)))
(setq count (1+ count))))
(message "%d occurrences" count))))
(defvar 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)
"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.
(kill-all-local-variables)
(use-local-map occur-mode-map)
(setq major-mode 'occur-mode)
(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."
(if (or (null occur-buffer)
(null (buffer-name occur-buffer)))
(error "Buffer in which occurences were found is deleted.")))
(let* ((occur-number (save-excursion
(/ (1- (count-lines (point-min) (point)))
(cond ((< occur-nlines 0)
(+ 2 (* 2 occur-nlines)))
(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.")
(fset 'list-matching-lines 'occur)
(defun occur (regexp &optional nlines)
"Show all lines following point containing a match for REGEXP.
Display each line 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))
(buffer (current-buffer))
(setq linenum (1+ (count-lines (point-min) (point))))
(with-output-to-temp-buffer "*Occur*"
(set-buffer standard-output)
(insert "Lines matching ")
(insert " in buffer " (buffer-name buffer) ?. ?\n)
(setq occur-buffer buffer)
(setq occur-nlines nlines)
(setq occur-pos-list ()))
(if (eq buffer standard-output)
;; 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))
(setq linenum (+ linenum (count-lines prevpos (point))))
(let* ((start (save-excursion
(forward-line (if (< nlines 0) nlines (- nlines)))
(forward-line (1+ nlines))
(tag (format "%3d" linenum))
(empty (make-string (length tag) ?\ ))
(set-buffer standard-output)
(setq occur-pos-list (cons tem occur-pos-list))
(insert-buffer-substring buffer start end)
(backward-char (- end start))
(setq tem (if (< nlines 0) (- nlines) nlines))
(set-buffer standard-output)
;; Put positions in increasing order to go with buffer.
(setq occur-pos-list (nreverse occur-pos-list))
(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 to-string
query-flag regexp-flag delimited-flag)
(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)
(lastrepl nil)) ;Position after last match considered.
(setq search-function 're-search-forward
search-string (concat "\\b"
(if regexp-flag from-string
(regexp-quote from-string))
(funcall search-function search-string nil t)))
;; Don't replace the null string
;; right after end of previous replacement.
(if (eq lastrepl (point))
(replace-match to-string nocasify literal)
;; Preserve the match data. Process filters and sentinels
;; could run inside read-char..
(let ((data (match-data))
'(concat "Query replacing "
(if regexp-flag "regexp " "")
from-string " with " to-string ".\n\n"
(substitute-command-keys query-replace-help))))
(while (= char help-char)
(message "Query replacing %s with %s: " from-string to-string)
(setq unread-command-char help-char char help-char)))
(replace-match to-string nocasify literal))
(replace-match to-string nocasify literal))
(replace-match to-string nocasify literal)
(replace-match to-string nocasify literal))
(setq done t query-flag nil))
(save-excursion (recursive-edit)))))
(delete-region (match-beginning 0) (match-end 0))
(save-excursion (recursive-edit))))
(setq unread-command-char char)
(setq lastrepl (point))))
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