code.delx.au - gnu-emacs/blob - lisp/replace.el

   1 ;;; replace.el --- replace commands for Emacs
   2
   3 ;; Copyright (C) 1985, 86, 87, 92, 94, 96, 1997, 2000, 2001, 2002
   4 ;;  Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; This package supplies the string and regular-expression replace functions
  28 ;; documented in the Emacs user's manual.
  29
  30 ;;; Code:
  31
  32 (defcustom case-replace t
  33   "*Non-nil means `query-replace' should preserve case in replacements."
  34   :type 'boolean
  35   :group 'matching)
  36
  37 (defvar query-replace-history nil)
  38
  39 (defvar query-replace-interactive nil
  40   "Non-nil means `query-replace' uses the last search string.
  41 That becomes the \"string to replace\".")
  42
  43 (defcustom query-replace-from-history-variable 'query-replace-history
  44   "History list to use for the FROM argument of `query-replace' commands.
  45 The value of this variable should be a symbol; that symbol
  46 is used as a variable to hold a history list for the strings
  47 or patterns to be replaced."
  48   :group 'matching
  49   :type 'symbol
  50   :version "20.3")
  51
  52 (defcustom query-replace-to-history-variable 'query-replace-history
  53   "History list to use for the TO argument of `query-replace' commands.
  54 The value of this variable should be a symbol; that symbol
  55 is used as a variable to hold a history list for replacement
  56 strings or patterns."
  57   :group 'matching
  58   :type 'symbol
  59   :version "20.3")
  60
  61 (defcustom query-replace-skip-read-only nil
  62   "*Non-nil means `query-replace' and friends ignore read-only matches."
  63   :type 'boolean
  64   :group 'matching
  65   :version "21.4")
  66
  67 (defun query-replace-read-args (string regexp-flag &optional noerror)
  68   (unless noerror
  69     (barf-if-buffer-read-only))
  70   (let (from to)
  71     (if query-replace-interactive
  72         (setq from (car (if regexp-flag regexp-search-ring search-ring)))
  73       (setq from (read-from-minibuffer (format "%s: " string)
  74                                        nil nil nil
  75                                        query-replace-from-history-variable
  76                                        nil t))
  77       ;; Warn if user types \n or \t, but don't reject the input.
  78       (if (string-match "\\\\[nt]" from)
  79           (let ((match (match-string 0 from)))
  80             (cond
  81              ((string= match "\\n")
  82               (message "Note: `\\n' here doesn't match a newline; to do that, type C-q C-j instead"))
  83              ((string= match "\\t")
  84               (message "Note: `\\t' here doesn't match a tab; to do that, just type TAB")))
  85             (sit-for 2))))
  86
  87     (setq to (read-from-minibuffer (format "%s %s with: " string from)
  88                                    nil nil nil
  89                                    query-replace-to-history-variable from t))
  90     (if (and transient-mark-mode mark-active)
  91         (list from to current-prefix-arg (region-beginning) (region-end))
  92       (list from to current-prefix-arg nil nil))))
  93
  94 (defun query-replace (from-string to-string &optional delimited start end)
  95   "Replace some occurrences of FROM-STRING with TO-STRING.
  96 As each match is found, the user must type a character saying
  97 what to do with it.  For directions, type \\[help-command] at that time.
  98
  99 In Transient Mark mode, if the mark is active, operate on the contents
 100 of the region.  Otherwise, operate from point to the end of the buffer.
 101
 102 If `query-replace-interactive' is non-nil, the last incremental search
 103 string is used as FROM-STRING--you don't have to specify it with the
 104 minibuffer.
 105
 106 Matching is independent of case if `case-fold-search' is non-nil and
 107 FROM-STRING has no uppercase letters.  Replacement transfers the case
 108 pattern of the old text to the new text, if `case-replace' and
 109 `case-fold-search' are non-nil and FROM-STRING has no uppercase
 110 letters.  \(Transferring the case pattern means that if the old text
 111 matched is all caps, or capitalized, then its replacement is upcased
 112 or capitalized.)
 113
 114 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 115 only matches surrounded by word boundaries.
 116 Fourth and fifth arg START and END specify the region to operate on.
 117
 118 To customize possible responses, change the \"bindings\" in `query-replace-map'."
 119   (interactive (query-replace-read-args "Query replace" nil))
 120   (perform-replace from-string to-string t nil delimited nil nil start end))
 121
 122 (define-key esc-map "%" 'query-replace)
 123
 124 (defun query-replace-regexp (regexp to-string &optional delimited start end)
 125   "Replace some things after point matching REGEXP with TO-STRING.
 126 As each match is found, the user must type a character saying
 127 what to do with it.  For directions, type \\[help-command] at that time.
 128
 129 In Transient Mark mode, if the mark is active, operate on the contents
 130 of the region.  Otherwise, operate from point to the end of the buffer.
 131
 132 If `query-replace-interactive' is non-nil, the last incremental search
 133 regexp is used as REGEXP--you don't have to specify it with the
 134 minibuffer.
 135
 136 Matching is independent of case if `case-fold-search' is non-nil and
 137 REGEXP has no uppercase letters.  Replacement transfers the case
 138 pattern of the old text to the new text, if `case-replace' and
 139 `case-fold-search' are non-nil and REGEXP has no uppercase letters.
 140 \(Transferring the case pattern means that if the old text matched is
 141 all caps, or capitalized, then its replacement is upcased or
 142 capitalized.)
 143
 144 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 145 only matches surrounded by word boundaries.
 146 Fourth and fifth arg START and END specify the region to operate on.
 147
 148 In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
 149 and `\\=\\N' (where N is a digit) stands for
 150  whatever what matched the Nth `\\(...\\)' in REGEXP."
 151   (interactive (query-replace-read-args "Query replace regexp" t))
 152   (perform-replace regexp to-string t t delimited nil nil start end))
 153 (define-key esc-map [?\C-%] 'query-replace-regexp)
 154
 155 (defun query-replace-regexp-eval (regexp to-expr &optional delimited start end)
 156   "Replace some things after point matching REGEXP with the result of TO-EXPR.
 157 As each match is found, the user must type a character saying
 158 what to do with it.  For directions, type \\[help-command] at that time.
 159
 160 TO-EXPR is a Lisp expression evaluated to compute each replacement.  It may
 161 reference `replace-count' to get the number of replacements already made.
 162 If the result of TO-EXPR is not a string, it is converted to one using
 163 `prin1-to-string' with the NOESCAPE argument (which see).
 164
 165 For convenience, when entering TO-EXPR interactively, you can use `\\&' or
 166 `\\0' to stand for whatever matched the whole of REGEXP, and `\\N' (where
 167 N is a digit) to stand for whatever matched the Nth `\\(...\\)' in REGEXP.
 168 Use `\\#&' or `\\#N' if you want a number instead of a string.
 169
 170 In Transient Mark mode, if the mark is active, operate on the contents
 171 of the region.  Otherwise, operate from point to the end of the buffer.
 172
 173 If `query-replace-interactive' is non-nil, the last incremental search
 174 regexp is used as REGEXP--you don't have to specify it with the
 175 minibuffer.
 176
 177 Preserves case in each replacement if `case-replace' and `case-fold-search'
 178 are non-nil and REGEXP has no uppercase letters.
 179
 180 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 181 only matches that are surrounded by word boundaries.
 182 Fourth and fifth arg START and END specify the region to operate on."
 183   (interactive
 184    (let (from to start end)
 185      (when (and transient-mark-mode mark-active)
 186        (setq start (region-beginning)
 187              end (region-end)))
 188      (if query-replace-interactive
 189          (setq from (car regexp-search-ring))
 190        (setq from (read-from-minibuffer "Query replace regexp: "
 191                                         nil nil nil
 192                                         query-replace-from-history-variable
 193                                         nil t)))
 194      (setq to (list (read-from-minibuffer
 195                      (format "Query replace regexp %s with eval: " from)
 196                      nil nil t query-replace-to-history-variable from t)))
 197      ;; We make TO a list because replace-match-string-symbols requires one,
 198      ;; and the user might enter a single token.
 199      (replace-match-string-symbols to)
 200      (list from (car to) current-prefix-arg start end)))
 201   (perform-replace regexp (cons 'replace-eval-replacement to-expr)
 202                    t t delimited nil nil start end))
 203
 204 (defun map-query-replace-regexp (regexp to-strings &optional n start end)
 205   "Replace some matches for REGEXP with various strings, in rotation.
 206 The second argument TO-STRINGS contains the replacement strings,
 207 separated by spaces.  Third arg DELIMITED (prefix arg if interactive),
 208 if non-nil, means replace only matches surrounded by word boundaries.
 209 This command works like `query-replace-regexp' except that each
 210 successive replacement uses the next successive replacement string,
 211 wrapping around from the last such string to the first.
 212
 213 In Transient Mark mode, if the mark is active, operate on the contents
 214 of the region.  Otherwise, operate from point to the end of the buffer.
 215
 216 Non-interactively, TO-STRINGS may be a list of replacement strings.
 217
 218 If `query-replace-interactive' is non-nil, the last incremental search
 219 regexp is used as REGEXP--you don't have to specify it with the minibuffer.
 220
 221 A prefix argument N says to use each replacement string N times
 222 before rotating to the next.
 223 Fourth and fifth arg START and END specify the region to operate on."
 224   (interactive
 225    (let (from to start end)
 226      (when (and transient-mark-mode mark-active)
 227        (setq start (region-beginning)
 228              end (region-end)))
 229      (setq from (if query-replace-interactive
 230                     (car regexp-search-ring)
 231                   (read-from-minibuffer "Map query replace (regexp): "
 232                                         nil nil nil
 233                                         'query-replace-history nil t)))
 234      (setq to (read-from-minibuffer
 235                (format "Query replace %s with (space-separated strings): "
 236                        from)
 237                nil nil nil
 238                'query-replace-history from t))
 239      (list from to start end current-prefix-arg)))
 240   (let (replacements)
 241     (if (listp to-strings)
 242         (setq replacements to-strings)
 243       (while (/= (length to-strings) 0)
 244         (if (string-match " " to-strings)
 245             (setq replacements
 246                   (append replacements
 247                           (list (substring to-strings 0
 248                                            (string-match " " to-strings))))
 249                   to-strings (substring to-strings
 250                                        (1+ (string-match " " to-strings))))
 251           (setq replacements (append replacements (list to-strings))
 252                 to-strings ""))))
 253     (perform-replace regexp replacements t t nil n nil start end)))
 254
 255 (defun replace-string (from-string to-string &optional delimited start end)
 256   "Replace occurrences of FROM-STRING with TO-STRING.
 257 Preserve case in each match if `case-replace' and `case-fold-search'
 258 are non-nil and FROM-STRING has no uppercase letters.
 259 \(Preserving case means that if the string matched is all caps, or capitalized,
 260 then its replacement is upcased or capitalized.)
 261
 262 In Transient Mark mode, if the mark is active, operate on the contents
 263 of the region.  Otherwise, operate from point to the end of the buffer.
 264
 265 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 266 only matches surrounded by word boundaries.
 267 Fourth and fifth arg START and END specify the region to operate on.
 268
 269 If `query-replace-interactive' is non-nil, the last incremental search
 270 string is used as FROM-STRING--you don't have to specify it with the
 271 minibuffer.
 272
 273 This function is usually the wrong thing to use in a Lisp program.
 274 What you probably want is a loop like this:
 275   (while (search-forward FROM-STRING nil t)
 276     (replace-match TO-STRING nil t))
 277 which will run faster and will not set the mark or print anything.
 278 \(You may need a more complex loop if FROM-STRING can match the null string
 279 and TO-STRING is also null.)"
 280   (interactive (query-replace-read-args "Replace string" nil))
 281   (perform-replace from-string to-string nil nil delimited nil nil start end))
 282
 283 (defun replace-regexp (regexp to-string &optional delimited start end)
 284   "Replace things after point matching REGEXP with TO-STRING.
 285 Preserve case in each match if `case-replace' and `case-fold-search'
 286 are non-nil and REGEXP has no uppercase letters.
 287
 288 In Transient Mark mode, if the mark is active, operate on the contents
 289 of the region.  Otherwise, operate from point to the end of the buffer.
 290
 291 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 292 only matches surrounded by word boundaries.
 293 Fourth and fifth arg START and END specify the region to operate on.
 294
 295 In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
 296 and `\\=\\N' (where N is a digit) stands for
 297  whatever what matched the Nth `\\(...\\)' in REGEXP.
 298
 299 If `query-replace-interactive' is non-nil, the last incremental search
 300 regexp is used as REGEXP--you don't have to specify it with the minibuffer.
 301
 302 This function is usually the wrong thing to use in a Lisp program.
 303 What you probably want is a loop like this:
 304   (while (re-search-forward REGEXP nil t)
 305     (replace-match TO-STRING nil nil))
 306 which will run faster and will not set the mark or print anything."
 307   (interactive (query-replace-read-args "Replace regexp" t))
 308   (perform-replace regexp to-string nil t delimited nil nil start end))
 309
 310 \f
 311 (defvar regexp-history nil
 312   "History list for some commands that read regular expressions.")
 313
 314
 315 (defalias 'delete-non-matching-lines 'keep-lines)
 316 (defalias 'delete-matching-lines 'flush-lines)
 317 (defalias 'count-matches 'how-many)
 318
 319
 320 (defun keep-lines-read-args (prompt)
 321   "Read arguments for `keep-lines' and friends.
 322 Prompt for a regexp with PROMPT.
 323 Value is a list, (REGEXP)."
 324   (list (read-from-minibuffer prompt nil nil nil
 325                               'regexp-history nil t)))
 326
 327 (defun keep-lines (regexp &optional rstart rend)
 328   "Delete all lines except those containing matches for REGEXP.
 329 A match split across lines preserves all the lines it lies in.
 330 Applies to all lines after point.
 331
 332 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 333 the matching is case-sensitive.
 334
 335 Second and third arg RSTART and REND specify the region to operate on.
 336
 337 Interactively, in Transient Mark mode when the mark is active, operate
 338 on the contents of the region.  Otherwise, operate from point to the
 339 end of the buffer."
 340
 341   (interactive
 342    (progn
 343      (barf-if-buffer-read-only)
 344      (keep-lines-read-args "Keep lines (containing match for regexp): ")))
 345   (if rstart
 346       (progn
 347         (goto-char (min rstart rend))
 348         (setq rend (copy-marker (max rstart rend))))
 349     (if (and transient-mark-mode mark-active)
 350         (setq rstart (region-beginning)
 351               rend (copy-marker (region-end)))
 352       (setq rstart (point)
 353             rend (point-max-marker)))
 354     (goto-char rstart))
 355   (save-excursion
 356     (or (bolp) (forward-line 1))
 357     (let ((start (point))
 358           (case-fold-search  (and case-fold-search
 359                                   (isearch-no-upper-case-p regexp t))))
 360       (while (< (point) rend)
 361         ;; Start is first char not preserved by previous match.
 362         (if (not (re-search-forward regexp rend 'move))
 363             (delete-region start rend)
 364           (let ((end (save-excursion (goto-char (match-beginning 0))
 365                                      (beginning-of-line)
 366                                      (point))))
 367             ;; Now end is first char preserved by the new match.
 368             (if (< start end)
 369                 (delete-region start end))))
 370
 371         (setq start (save-excursion (forward-line 1) (point)))
 372         ;; If the match was empty, avoid matching again at same place.
 373         (and (< (point) rend)
 374              (= (match-beginning 0) (match-end 0))
 375              (forward-char 1))))))
 376
 377
 378 (defun flush-lines (regexp &optional rstart rend)
 379   "Delete lines containing matches for REGEXP.
 380 If a match is split across lines, all the lines it lies in are deleted.
 381 Applies to lines after point.
 382
 383 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 384 the matching is case-sensitive.
 385
 386 Second and third arg RSTART and REND specify the region to operate on.
 387
 388 Interactively, in Transient Mark mode when the mark is active, operate
 389 on the contents of the region.  Otherwise, operate from point to the
 390 end of the buffer."
 391
 392   (interactive
 393    (progn
 394      (barf-if-buffer-read-only)
 395      (keep-lines-read-args "Flush lines (containing match for regexp): ")))
 396   (if rstart
 397       (progn
 398         (goto-char (min rstart rend))
 399         (setq rend (copy-marker (max rstart rend))))
 400     (if (and transient-mark-mode mark-active)
 401         (setq rstart (region-beginning)
 402               rend (copy-marker (region-end)))
 403       (setq rstart (point)
 404             rend (point-max-marker)))
 405     (goto-char rstart))
 406   (let ((case-fold-search (and case-fold-search
 407                                (isearch-no-upper-case-p regexp t))))
 408     (save-excursion
 409       (while (and (< (point) rend)
 410                   (re-search-forward regexp rend t))
 411         (delete-region (save-excursion (goto-char (match-beginning 0))
 412                                        (beginning-of-line)
 413                                        (point))
 414                        (progn (forward-line 1) (point)))))))
 415
 416
 417 (defun how-many (regexp &optional rstart rend)
 418   "Print number of matches for REGEXP following point.
 419
 420 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 421 the matching is case-sensitive.
 422
 423 Second and third arg RSTART and REND specify the region to operate on.
 424
 425 Interactively, in Transient Mark mode when the mark is active, operate
 426 on the contents of the region.  Otherwise, operate from point to the
 427 end of the buffer."
 428
 429   (interactive
 430    (keep-lines-read-args "How many matches for (regexp): "))
 431   (save-excursion
 432     (if rstart
 433         (goto-char (min rstart rend))
 434       (if (and transient-mark-mode mark-active)
 435           (setq rstart (region-beginning)
 436                 rend (copy-marker (region-end)))
 437         (setq rstart (point)
 438               rend (point-max-marker)))
 439       (goto-char rstart))
 440     (let ((count 0)
 441           opoint
 442           (case-fold-search (and case-fold-search
 443                                  (isearch-no-upper-case-p regexp t))))
 444       (while (and (< (point) rend)
 445                   (progn (setq opoint (point))
 446                          (re-search-forward regexp rend t)))
 447         (if (= opoint (point))
 448             (forward-char 1)
 449           (setq count (1+ count))))
 450       (message "%d occurrences" count))))
 451
 452 \f
 453 (defvar occur-mode-map
 454   (let ((map (make-sparse-keymap)))
 455     (define-key map [mouse-2] 'occur-mode-mouse-goto)
 456     (define-key map "\C-c\C-c" 'occur-mode-goto-occurrence)
 457     (define-key map "\C-m" 'occur-mode-goto-occurrence)
 458     (define-key map "o" 'occur-mode-goto-occurrence-other-window)
 459     (define-key map "\C-o" 'occur-mode-display-occurrence)
 460     (define-key map "\M-n" 'occur-next)
 461     (define-key map "\M-p" 'occur-prev)
 462     (define-key map "r" 'occur-rename-buffer)
 463     (define-key map "c" 'clone-buffer)
 464     (define-key map "g" 'revert-buffer)
 465     (define-key map "q" 'quit-window)
 466     (define-key map "z" 'kill-this-buffer)
 467     map)
 468   "Keymap for `occur-mode'.")
 469
 470 (defvar occur-revert-arguments nil
 471   "Arguments to pass to `occur-1' to revert an Occur mode buffer.
 472 See `occur-revert-function'.")
 473
 474 (defcustom occur-mode-hook '(turn-on-font-lock)
 475   "Hook run when entering Occur mode."
 476   :type 'hook
 477   :group 'matching)
 478
 479 (defcustom occur-hook nil
 480   "Hook run when `occur' is called."
 481   :type 'hook
 482   :group 'matching)
 483
 484 (put 'occur-mode 'mode-class 'special)
 485 (defun occur-mode ()
 486   "Major mode for output from \\[occur].
 487 \\<occur-mode-map>Move point to one of the items in this buffer, then use
 488 \\[occur-mode-goto-occurrence] to go to the occurrence that the item refers to.
 489 Alternatively, click \\[occur-mode-mouse-goto] on an item to go to it.
 490
 491 \\{occur-mode-map}"
 492   (interactive)
 493   (kill-all-local-variables)
 494   (use-local-map occur-mode-map)
 495   (setq major-mode 'occur-mode)
 496   (setq mode-name "Occur")
 497   (set (make-local-variable 'revert-buffer-function) 'occur-revert-function)
 498   (make-local-variable 'occur-revert-arguments)
 499   (add-hook 'change-major-mode-hook 'font-lock-defontify nil t)
 500   (run-hooks 'occur-mode-hook))
 501
 502 (defun occur-revert-function (ignore1 ignore2)
 503   "Handle `revert-buffer' for Occur mode buffers."
 504   (apply 'occur-1 (append occur-revert-arguments (list (buffer-name)))))
 505
 506 (defun occur-mode-mouse-goto (event)
 507   "In Occur mode, go to the occurrence whose line you click on."
 508   (interactive "e")
 509   (let (pos)
 510     (save-excursion
 511       (set-buffer (window-buffer (posn-window (event-end event))))
 512       (save-excursion
 513         (goto-char (posn-point (event-end event)))
 514         (setq pos (occur-mode-find-occurrence))))
 515     (pop-to-buffer (marker-buffer pos))
 516     (goto-char pos)))
 517
 518 (defun occur-mode-find-occurrence ()
 519   (let ((pos (get-text-property (point) 'occur-target)))
 520     (unless pos
 521       (error "No occurrence on this line"))
 522     (unless (buffer-live-p (marker-buffer pos))
 523       (error "Buffer for this occurrence was killed"))
 524     pos))
 525
 526 (defun occur-mode-goto-occurrence ()
 527   "Go to the occurrence the current line describes."
 528   (interactive)
 529   (let ((pos (occur-mode-find-occurrence)))
 530     (pop-to-buffer (marker-buffer pos))
 531     (goto-char pos)))
 532
 533 (defun occur-mode-goto-occurrence-other-window ()
 534   "Go to the occurrence the current line describes, in another window."
 535   (interactive)
 536   (let ((pos (occur-mode-find-occurrence)))
 537     (switch-to-buffer-other-window (marker-buffer pos))
 538     (goto-char pos)))
 539
 540 (defun occur-mode-display-occurrence ()
 541   "Display in another window the occurrence the current line describes."
 542   (interactive)
 543   (let ((pos (occur-mode-find-occurrence))
 544         window
 545         ;; Bind these to ensure `display-buffer' puts it in another window.
 546         same-window-buffer-names
 547         same-window-regexps)
 548     (setq window (display-buffer (marker-buffer pos)))
 549     ;; This is the way to set point in the proper window.
 550     (save-selected-window
 551       (select-window window)
 552       (goto-char pos))))
 553
 554 (defun occur-find-match (n search message)
 555   (if (not n) (setq n 1))
 556   (let ((r))
 557     (while (> n 0)
 558       (setq r (funcall search (point) 'occur-match))
 559       (and r
 560            (get-text-property r 'occur-match)
 561            (setq r (funcall search r 'occur-match)))
 562       (if r
 563           (goto-char r)
 564         (error message))
 565       (setq n (1- n)))))
 566
 567 (defun occur-next (&optional n)
 568   "Move to the Nth (default 1) next match in an Occur mode buffer."
 569   (interactive "p")
 570   (occur-find-match n #'next-single-property-change "No more matches"))
 571
 572 (defun occur-prev (&optional n)
 573   "Move to the Nth (default 1) previous match in an Occur mode buffer."
 574   (interactive "p")
 575   (occur-find-match n #'previous-single-property-change "No earlier matches"))
 576 \f
 577 (defcustom list-matching-lines-default-context-lines 0
 578   "*Default number of context lines included around `list-matching-lines' matches.
 579 A negative number means to include that many lines before the match.
 580 A positive number means to include that many lines both before and after."
 581   :type 'integer
 582   :group 'matching)
 583
 584 (defalias 'list-matching-lines 'occur)
 585
 586 (defcustom list-matching-lines-face 'bold
 587   "*Face used by \\[list-matching-lines] to show the text that matches.
 588 If the value is nil, don't highlight the matching portions specially."
 589   :type 'face
 590   :group 'matching)
 591
 592 (defcustom list-matching-lines-buffer-name-face 'underline
 593   "*Face used by \\[list-matching-lines] to show the names of buffers.
 594 If the value is nil, don't highlight the buffer names specially."
 595   :type 'face
 596   :group 'matching)
 597
 598 (defun occur-accumulate-lines (count &optional no-props)
 599   (save-excursion
 600     (let ((forwardp (> count 0))
 601           (result nil))
 602       (while (not (or (zerop count)
 603                       (if forwardp
 604                           (eobp)
 605                         (bobp))))
 606         (setq count (+ count (if forwardp -1 1)))
 607         (push
 608          (funcall (if no-props
 609                       #'buffer-substring-no-properties
 610                     #'buffer-substring)
 611           (line-beginning-position)
 612           (line-end-position))
 613          result)
 614         (forward-line (if forwardp 1 -1)))
 615       (nreverse result))))
 616
 617 (defun occur-read-primary-args ()
 618   (list (let* ((default (car regexp-history))
 619                (input
 620                 (read-from-minibuffer
 621                  (if default
 622                      (format "List lines matching regexp (default `%s'): "
 623                              default)
 624                    "List lines matching regexp: ")
 625                  nil
 626                  nil
 627                  nil
 628                  'regexp-history)))
 629           (if (equal input "")
 630               default
 631             input))
 632         (when current-prefix-arg
 633           (prefix-numeric-value current-prefix-arg))))
 634
 635 (defun occur-rename-buffer (&optional unique-p)
 636   "Rename the current *Occur* buffer to *Occur: original-buffer-name*.
 637 Here `original-buffer-name' is the buffer name were occur was originally run.
 638 When given the prefix argument, the renaming will not clobber the existing
 639 buffer(s) of that name, but use `generate-new-buffer-name' instead.
 640 You can add this to `occur-hook' if you always want a separate *Occur*
 641 buffer for each buffer where you invoke `occur'."
 642   (interactive "P")
 643   (with-current-buffer
 644       (if (eq major-mode 'occur-mode) (current-buffer) (get-buffer "*Occur*"))
 645     (rename-buffer (concat "*Occur: "
 646                            (mapconcat #'buffer-name
 647                                       (car (cddr occur-revert-arguments)) "/")
 648                            "*")
 649                    unique-p)))
 650
 651 (defun occur (regexp &optional nlines)
 652   "Show all lines in the current buffer containing a match for REGEXP.
 653
 654 If a match spreads across multiple lines, all those lines are shown.
 655
 656 Each line is displayed with NLINES lines before and after, or -NLINES
 657 before if NLINES is negative.
 658 NLINES defaults to `list-matching-lines-default-context-lines'.
 659 Interactively it is the prefix arg.
 660
 661 The lines are shown in a buffer named `*Occur*'.
 662 It serves as a menu to find any of the occurrences in this buffer.
 663 \\<occur-mode-map>\\[describe-mode] in that buffer will explain how.
 664
 665 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 666 the matching is case-sensitive."
 667   (interactive (occur-read-primary-args))
 668   (occur-1 regexp nlines (list (current-buffer))))
 669
 670 (defun multi-occur (bufs regexp &optional nlines)
 671   "Show all lines in buffers BUFS containing a match for REGEXP.
 672 This function acts on multiple buffers; otherwise, it is exactly like
 673 `occur'."
 674   (interactive
 675    (cons
 676     (let* ((bufs (list (read-buffer "First buffer to search: "
 677                                     (current-buffer) t)))
 678            (buf nil)
 679            (ido-ignore-item-temp-list bufs))
 680       (while (not (string-equal
 681                    (setq buf (read-buffer
 682                               (if (eq read-buffer-function 'ido-read-buffer)
 683                                   "Next buffer to search (C-j to end): "
 684                                 "Next buffer to search (RET to end): ")
 685                               nil t))
 686                    ""))
 687         (add-to-list 'bufs buf)
 688         (setq ido-ignore-item-temp-list bufs))
 689       (nreverse (mapcar #'get-buffer bufs)))
 690     (occur-read-primary-args)))
 691   (occur-1 regexp nlines bufs))
 692
 693 (defun multi-occur-by-filename-regexp (bufregexp regexp &optional nlines)
 694   "Show all lines matching REGEXP in buffers named by BUFREGEXP.
 695 See also `multi-occur'."
 696   (interactive
 697    (cons
 698     (let* ((default (car regexp-history))
 699            (input
 700             (read-from-minibuffer
 701              "List lines in buffers whose filename matches regexp: "
 702              nil
 703              nil
 704              nil
 705              'regexp-history)))
 706       (if (equal input "")
 707           default
 708         input))
 709     (occur-read-primary-args)))
 710   (when bufregexp
 711     (occur-1 regexp nlines
 712              (delq nil
 713                    (mapcar (lambda (buf)
 714                              (when (and (buffer-file-name buf)
 715                                         (string-match bufregexp
 716                                                       (buffer-file-name buf)))
 717                                buf))
 718                            (buffer-list))))))
 719
 720 (defun occur-1 (regexp nlines bufs &optional buf-name)
 721   (unless buf-name
 722     (setq buf-name "*Occur*"))
 723   (let ((occur-buf (get-buffer-create buf-name))
 724         (made-temp-buf nil)
 725         (active-bufs (delq nil (mapcar #'(lambda (buf)
 726                                            (when (buffer-live-p buf) buf))
 727                                        bufs))))
 728     ;; Handle the case where one of the buffers we're searching is the
 729     ;; *Occur* buffer itself.
 730     (when (memq occur-buf bufs)
 731       (setq occur-buf (with-current-buffer occur-buf
 732                         (clone-buffer "*Occur-temp*"))
 733             made-temp-buf t))
 734     (with-current-buffer occur-buf
 735       (setq buffer-read-only nil)
 736       (occur-mode)
 737       (erase-buffer)
 738       (let ((count (occur-engine
 739                     regexp active-bufs occur-buf
 740                     (or nlines list-matching-lines-default-context-lines)
 741                     (and case-fold-search
 742                          (isearch-no-upper-case-p regexp t))
 743                     list-matching-lines-buffer-name-face
 744                     nil list-matching-lines-face nil)))
 745         (let* ((bufcount (length active-bufs))
 746                (diff (- (length bufs) bufcount)))
 747           (message "Searched %d buffer%s%s; %s match%s for `%s'"
 748                    bufcount (if (= bufcount 1) "" "s")
 749                    (if (zerop diff) "" (format " (%d killed)" diff))
 750                    (if (zerop count) "no" (format "%d" count))
 751                    (if (= count 1) "" "es")
 752                    regexp))
 753         ;; If we had to make a temporary buffer, make it the *Occur*
 754         ;; buffer now.
 755         (when made-temp-buf
 756           (with-current-buffer (get-buffer buf-name)
 757             (kill-buffer (current-buffer)))
 758           (rename-buffer buf-name))
 759         (setq occur-revert-arguments (list regexp nlines bufs)
 760               buffer-read-only t)
 761         (if (> count 0)
 762             (display-buffer occur-buf)
 763           (kill-buffer occur-buf)))
 764       (run-hooks 'occur-hook))))
 765
 766 (defun occur-engine-add-prefix (lines)
 767   (mapcar
 768    #'(lambda (line)
 769        (concat "       :" line "\n"))
 770    lines))
 771
 772 (defun occur-engine (regexp buffers out-buf nlines case-fold-search
 773                             title-face prefix-face match-face keep-props)
 774   (with-current-buffer out-buf
 775     (setq buffer-read-only nil)
 776     (let ((globalcount 0)
 777           (coding nil))
 778       ;; Map over all the buffers
 779       (dolist (buf buffers)
 780         (when (buffer-live-p buf)
 781           (let ((matches 0)     ;; count of matched lines
 782                 (lines 1)       ;; line count
 783                 (matchbeg 0)
 784                 (matchend 0)
 785                 (origpt nil)
 786                 (begpt nil)
 787                 (endpt nil)
 788                 (marker nil)
 789                 (curstring "")
 790                 (headerpt (with-current-buffer out-buf (point))))
 791             (save-excursion
 792               (set-buffer buf)
 793               (or coding
 794                   ;; Set CODING only if the current buffer locally
 795                   ;; binds buffer-file-coding-system.
 796                   (not (local-variable-p 'buffer-file-coding-system))
 797                   (setq coding buffer-file-coding-system))
 798               (save-excursion
 799                 (goto-char (point-min)) ;; begin searching in the buffer
 800                 (while (not (eobp))
 801                   (setq origpt (point))
 802                   (when (setq endpt (re-search-forward regexp nil t))
 803                     (setq matches (1+ matches)) ;; increment match count
 804                     (setq matchbeg (match-beginning 0)
 805                           matchend (match-end 0))
 806                     (setq begpt (save-excursion
 807                                   (goto-char matchbeg)
 808                                   (line-beginning-position)))
 809                     (setq lines (+ lines (1- (count-lines origpt endpt))))
 810                     (setq marker (make-marker))
 811                     (set-marker marker matchbeg)
 812                     (setq curstring (buffer-substring begpt
 813                                                       (line-end-position)))
 814                     ;; Depropertize the string, and maybe
 815                     ;; highlight the matches
 816                     (let ((len (length curstring))
 817                           (start 0))
 818                       (unless keep-props
 819                         (set-text-properties 0 len nil curstring))
 820                       (while (and (< start len)
 821                                   (string-match regexp curstring start))
 822                         (add-text-properties (match-beginning 0)
 823                                              (match-end 0)
 824                                              (append
 825                                               `(occur-match t)
 826                                               (when match-face
 827                                                 `(font-lock-face ,match-face)))
 828                                              curstring)
 829                         (setq start (match-end 0))))
 830                     ;; Generate the string to insert for this match
 831                     (let* ((out-line
 832                             (concat
 833                              ;; Using 7 digits aligns tabs properly.
 834                              (apply #'propertize (format "%7d:" lines)
 835                                     (append
 836                                      (when prefix-face
 837                                        `(font-lock-face prefix-face))
 838                                      '(occur-prefix t)))
 839                              curstring
 840                              "\n"))
 841                            (data
 842                             (if (= nlines 0)
 843                                 ;; The simple display style
 844                                 out-line
 845                               ;; The complex multi-line display
 846                               ;; style.  Generate a list of lines,
 847                               ;; concatenate them all together.
 848                               (apply #'concat
 849                                      (nconc
 850                                       (occur-engine-add-prefix (nreverse (cdr (occur-accumulate-lines (- (1+ nlines)) keep-props))))
 851                                       (list out-line)
 852                                       (occur-engine-add-prefix (cdr (occur-accumulate-lines (1+ nlines) keep-props))))))))
 853                       ;; Actually insert the match display data
 854                       (with-current-buffer out-buf
 855                         (let ((beg (point))
 856                               (end (progn (insert data) (point))))
 857                           (unless (= nlines 0)
 858                             (insert "-------\n"))
 859                           (add-text-properties
 860                            beg end
 861                            `(occur-target ,marker help-echo "mouse-2: go to this occurrence"))
 862                           ;; We don't put `mouse-face' on the newline,
 863                           ;; because that loses.
 864                           (add-text-properties beg (1- end) '(mouse-face highlight)))))
 865                     (goto-char endpt))
 866                   (if endpt
 867                       (progn
 868                         (setq lines (1+ lines))
 869                         ;; On to the next match...
 870                         (forward-line 1))
 871                     (goto-char (point-max))))))
 872             (when (not (zerop matches)) ;; is the count zero?
 873               (setq globalcount (+ globalcount matches))
 874               (with-current-buffer out-buf
 875                 (goto-char headerpt)
 876                 (let ((beg (point))
 877                       end)
 878                   (insert (format "%d lines matching \"%s\" in buffer: %s\n"
 879                                   matches regexp (buffer-name buf)))
 880                   (setq end (point))
 881                   (add-text-properties beg end
 882                                        (append
 883                                         (when title-face
 884                                           `(font-lock-face ,title-face))
 885                                         `(occur-title ,buf))))
 886                 (goto-char (point-min)))))))
 887       (if coding
 888           ;; CODING is buffer-file-coding-system of the first buffer
 889           ;; that locally binds it.  Let's use it also for the output
 890           ;; buffer.
 891           (set-buffer-file-coding-system coding))
 892       ;; Return the number of matches
 893       globalcount)))
 894
 895 \f
 896 ;; It would be nice to use \\[...], but there is no reasonable way
 897 ;; to make that display both SPC and Y.
 898 (defconst query-replace-help
 899   "Type Space or `y' to replace one match, Delete or `n' to skip to next,
 900 RET or `q' to exit, Period to replace one match and exit,
 901 Comma to replace but not move point immediately,
 902 C-r to enter recursive edit (\\[exit-recursive-edit] to get out again),
 903 C-w to delete match and recursive edit,
 904 C-l to clear the screen, redisplay, and offer same replacement again,
 905 ! to replace all remaining matches with no more questions,
 906 ^ to move point back to previous match,
 907 E to edit the replacement string"
 908   "Help message while in `query-replace'.")
 909
 910 (defvar query-replace-map (make-sparse-keymap)
 911   "Keymap that defines the responses to questions in `query-replace'.
 912 The \"bindings\" in this map are not commands; they are answers.
 913 The valid answers include `act', `skip', `act-and-show',
 914 `exit', `act-and-exit', `edit', `delete-and-edit', `recenter',
 915 `automatic', `backup', `exit-prefix', and `help'.")
 916
 917 (define-key query-replace-map " " 'act)
 918 (define-key query-replace-map "\d" 'skip)
 919 (define-key query-replace-map [delete] 'skip)
 920 (define-key query-replace-map [backspace] 'skip)
 921 (define-key query-replace-map "y" 'act)
 922 (define-key query-replace-map "n" 'skip)
 923 (define-key query-replace-map "Y" 'act)
 924 (define-key query-replace-map "N" 'skip)
 925 (define-key query-replace-map "e" 'edit-replacement)
 926 (define-key query-replace-map "E" 'edit-replacement)
 927 (define-key query-replace-map "," 'act-and-show)
 928 (define-key query-replace-map "q" 'exit)
 929 (define-key query-replace-map "\r" 'exit)
 930 (define-key query-replace-map [return] 'exit)
 931 (define-key query-replace-map "." 'act-and-exit)
 932 (define-key query-replace-map "\C-r" 'edit)
 933 (define-key query-replace-map "\C-w" 'delete-and-edit)
 934 (define-key query-replace-map "\C-l" 'recenter)
 935 (define-key query-replace-map "!" 'automatic)
 936 (define-key query-replace-map "^" 'backup)
 937 (define-key query-replace-map "\C-h" 'help)
 938 (define-key query-replace-map [f1] 'help)
 939 (define-key query-replace-map [help] 'help)
 940 (define-key query-replace-map "?" 'help)
 941 (define-key query-replace-map "\C-g" 'quit)
 942 (define-key query-replace-map "\C-]" 'quit)
 943 (define-key query-replace-map "\e" 'exit-prefix)
 944 (define-key query-replace-map [escape] 'exit-prefix)
 945
 946 (defun replace-match-string-symbols (n)
 947   "Process a list (and any sub-lists), expanding certain symbols.
 948 Symbol  Expands To
 949 N     (match-string N)           (where N is a string of digits)
 950 #N    (string-to-number (match-string N))
 951 &     (match-string 0)
 952 #&    (string-to-number (match-string 0))
 953
 954 Note that these symbols must be preceeded by a backslash in order to
 955 type them."
 956   (while n
 957     (cond
 958      ((consp (car n))
 959       (replace-match-string-symbols (car n))) ;Process sub-list
 960      ((symbolp (car n))
 961       (let ((name (symbol-name (car n))))
 962         (cond
 963          ((string-match "^[0-9]+$" name)
 964           (setcar n (list 'match-string (string-to-number name))))
 965          ((string-match "^#[0-9]+$" name)
 966           (setcar n (list 'string-to-number
 967                           (list 'match-string
 968                                 (string-to-number (substring name 1))))))
 969          ((string= "&" name)
 970           (setcar n '(match-string 0)))
 971          ((string= "#&" name)
 972           (setcar n '(string-to-number (match-string 0))))))))
 973     (setq n (cdr n))))
 974
 975 (defun replace-eval-replacement (expression replace-count)
 976   (let ((replacement (eval expression)))
 977     (if (stringp replacement)
 978         replacement
 979       (prin1-to-string replacement t))))
 980
 981 (defun replace-loop-through-replacements (data replace-count)
 982   ;; DATA is a vector contaning the following values:
 983   ;;   0 next-rotate-count
 984   ;;   1 repeat-count
 985   ;;   2 next-replacement
 986   ;;   3 replacements
 987   (if (= (aref data 0) replace-count)
 988       (progn
 989         (aset data 0 (+ replace-count (aref data 1)))
 990         (let ((next (cdr (aref data 2))))
 991           (aset data 2 (if (consp next) next (aref data 3))))))
 992   (car (aref data 2)))
 993
 994 (defun perform-replace (from-string replacements
 995                         query-flag regexp-flag delimited-flag
 996                         &optional repeat-count map start end)
 997   "Subroutine of `query-replace'.  Its complexity handles interactive queries.
 998 Don't use this in your own program unless you want to query and set the mark
 999 just as `query-replace' does.  Instead, write a simple loop like this:
1000
1001   (while (re-search-forward \"foo[ \\t]+bar\" nil t)
1002     (replace-match \"foobar\" nil nil))
1003
1004 which will run faster and probably do exactly what you want.  Please
1005 see the documentation of `replace-match' to find out how to simulate
1006 `case-replace'.
1007
1008 This function returns nil if and only if there were no matches to
1009 make, or the user didn't cancel the call."
1010   (or map (setq map query-replace-map))
1011   (and query-flag minibuffer-auto-raise
1012        (raise-frame (window-frame (minibuffer-window))))
1013   (let ((nocasify (not (and case-fold-search case-replace
1014                             (string-equal from-string
1015                                           (downcase from-string)))))
1016         (case-fold-search (and case-fold-search
1017                                (string-equal from-string
1018                                              (downcase from-string))))
1019         (literal (not regexp-flag))
1020         (search-function (if regexp-flag 're-search-forward 'search-forward))
1021         (search-string from-string)
1022         (real-match-data nil)           ; the match data for the current match
1023         (next-replacement nil)
1024         (keep-going t)
1025         (stack nil)
1026         (replace-count 0)
1027         (nonempty-match nil)
1028
1029         ;; If non-nil, it is marker saying where in the buffer to stop.
1030         (limit nil)
1031
1032         ;; Data for the next match.  If a cons, it has the same format as
1033         ;; (match-data); otherwise it is t if a match is possible at point.
1034         (match-again t)
1035
1036         (message
1037          (if query-flag
1038              (substitute-command-keys
1039               "Query replacing %s with %s: (\\<query-replace-map>\\[help] for help) "))))
1040
1041     ;; If region is active, in Transient Mark mode, operate on region.
1042     (when start
1043       (setq limit (copy-marker (max start end)))
1044       (goto-char (min start end))
1045       (deactivate-mark))
1046
1047     ;; REPLACEMENTS is either a string, a list of strings, or a cons cell
1048     ;; containing a function and its first argument.  The function is
1049     ;; called to generate each replacement like this:
1050     ;;   (funcall (car replacements) (cdr replacements) replace-count)
1051     ;; It must return a string.
1052     (cond
1053      ((stringp replacements)
1054       (setq next-replacement replacements
1055             replacements     nil))
1056      ((stringp (car replacements)) ; If it isn't a string, it must be a cons
1057       (or repeat-count (setq repeat-count 1))
1058       (setq replacements (cons 'replace-loop-through-replacements
1059                                (vector repeat-count repeat-count
1060                                        replacements replacements)))))
1061
1062     (if delimited-flag
1063         (setq search-function 're-search-forward
1064               search-string (concat "\\b"
1065                                     (if regexp-flag from-string
1066                                       (regexp-quote from-string))
1067                                     "\\b")))
1068     (push-mark)
1069     (undo-boundary)
1070     (unwind-protect
1071         ;; Loop finding occurrences that perhaps should be replaced.
1072         (while (and keep-going
1073                     (not (eobp))
1074                     ;; Use the next match if it is already known;
1075                     ;; otherwise, search for a match after moving forward
1076                     ;; one char if progress is required.
1077                     (setq real-match-data
1078                           (if (consp match-again)
1079                               (progn (goto-char (nth 1 match-again))
1080                                      match-again)
1081                             (and (or match-again
1082                                      ;; MATCH-AGAIN non-nil means we
1083                                      ;; accept an adjacent match.  If
1084                                      ;; we don't, move one char to the
1085                                      ;; right.  This takes us a
1086                                      ;; character too far at the end,
1087                                      ;; but this is undone after the
1088                                      ;; while-loop.
1089                                      (progn (forward-char 1) (not (eobp))))
1090                                  (funcall search-function search-string limit t)
1091                                  ;; For speed, use only integers and
1092                                  ;; reuse the list used last time.
1093                                  (match-data t real-match-data)))))
1094           ;; Optionally ignore matches that have a read-only property.
1095           (unless (and query-replace-skip-read-only
1096                        (text-property-not-all
1097                         (match-beginning 0) (match-end 0)
1098                         'read-only nil))
1099
1100             ;; Record whether the match is nonempty, to avoid an infinite loop
1101             ;; repeatedly matching the same empty string.
1102             (setq nonempty-match
1103                   (/= (nth 0 real-match-data) (nth 1 real-match-data)))
1104
1105             ;; If the match is empty, record that the next one can't be
1106             ;; adjacent.
1107
1108             ;; Otherwise, if matching a regular expression, do the next
1109             ;; match now, since the replacement for this match may
1110             ;; affect whether the next match is adjacent to this one.
1111             ;; If that match is empty, don't use it.
1112             (setq match-again
1113                   (and nonempty-match
1114                        (or (not regexp-flag)
1115                            (and (looking-at search-string)
1116                                 (let ((match (match-data)))
1117                                   (and (/= (nth 0 match) (nth 1 match))
1118                                        match))))))
1119
1120             ;; Calculate the replacement string, if necessary.
1121             (when replacements
1122               (set-match-data real-match-data)
1123               (setq next-replacement
1124                     (funcall (car replacements) (cdr replacements)
1125                              replace-count)))
1126             (if (not query-flag)
1127                 (let ((inhibit-read-only query-replace-skip-read-only))
1128                   (set-match-data real-match-data)
1129                   (replace-match next-replacement nocasify literal)
1130                   (setq replace-count (1+ replace-count)))
1131               (undo-boundary)
1132               (let (done replaced key def)
1133                 ;; Loop reading commands until one of them sets done,
1134                 ;; which means it has finished handling this occurrence.
1135                 (while (not done)
1136                   (set-match-data real-match-data)
1137                   (replace-highlight (match-beginning 0) (match-end 0))
1138                   ;; Bind message-log-max so we don't fill up the message log
1139                   ;; with a bunch of identical messages.
1140                   (let ((message-log-max nil))
1141                     (message message from-string next-replacement))
1142                   (setq key (read-event))
1143                   ;; Necessary in case something happens during read-event
1144                   ;; that clobbers the match data.
1145                   (set-match-data real-match-data)
1146                   (setq key (vector key))
1147                   (setq def (lookup-key map key))
1148                   ;; Restore the match data while we process the command.
1149                   (cond ((eq def 'help)
1150                          (with-output-to-temp-buffer "*Help*"
1151                            (princ
1152                             (concat "Query replacing "
1153                                     (if regexp-flag "regexp " "")
1154                                     from-string " with "
1155                                     next-replacement ".\n\n"
1156                                     (substitute-command-keys
1157                                      query-replace-help)))
1158                            (with-current-buffer standard-output
1159                              (help-mode))))
1160                         ((eq def 'exit)
1161                          (setq keep-going nil)
1162                          (setq done t))
1163                         ((eq def 'backup)
1164                          (if stack
1165                              (let ((elt (pop stack)))
1166                                (goto-char (car elt))
1167                                (setq replaced (eq t (cdr elt)))
1168                                (or replaced
1169                                    (set-match-data (cdr elt))))
1170                            (message "No previous match")
1171                            (ding 'no-terminate)
1172                            (sit-for 1)))
1173                         ((eq def 'act)
1174                          (or replaced
1175                              (progn
1176                                (replace-match next-replacement nocasify literal)
1177                                (setq replace-count (1+ replace-count))))
1178                          (setq done t replaced t))
1179                         ((eq def 'act-and-exit)
1180                          (or replaced
1181                              (progn
1182                                (replace-match next-replacement nocasify literal)
1183                                (setq replace-count (1+ replace-count))))
1184                          (setq keep-going nil)
1185                          (setq done t replaced t))
1186                         ((eq def 'act-and-show)
1187                          (if (not replaced)
1188                              (progn
1189                                (replace-match next-replacement nocasify literal)
1190                                (setq replace-count (1+ replace-count))
1191                                (setq replaced t))))
1192                         ((eq def 'automatic)
1193                          (or replaced
1194                              (progn
1195                                (replace-match next-replacement nocasify literal)
1196                                (setq replace-count (1+ replace-count))))
1197                          (setq done t query-flag nil replaced t))
1198                         ((eq def 'skip)
1199                          (setq done t))
1200                         ((eq def 'recenter)
1201                          (recenter nil))
1202                         ((eq def 'edit)
1203                          (let ((opos (point-marker)))
1204                            (goto-char (match-beginning 0))
1205                            (save-excursion
1206                              (funcall search-function search-string limit t)
1207                              (setq real-match-data (match-data)))
1208                            (save-excursion
1209                              (save-window-excursion
1210                                (recursive-edit)))
1211                            (goto-char opos))
1212                          (set-match-data real-match-data)
1213                          ;; Before we make the replacement,
1214                          ;; decide whether the search string
1215                          ;; can match again just after this match.
1216                          (if (and regexp-flag nonempty-match)
1217                              (setq match-again (and (looking-at search-string)
1218                                                     (match-data)))))
1219
1220                         ;; Edit replacement.
1221                         ((eq def 'edit-replacement)
1222                          (setq next-replacement
1223                                (read-input "Edit replacement string: "
1224                                            next-replacement))
1225                          (or replaced
1226                              (replace-match next-replacement nocasify literal))
1227                          (setq done t))
1228
1229                         ((eq def 'delete-and-edit)
1230                          (delete-region (match-beginning 0) (match-end 0))
1231                          (set-match-data
1232                           (prog1 (match-data)
1233                             (save-excursion (recursive-edit))))
1234                          (setq replaced t))
1235                         ;; Note: we do not need to treat `exit-prefix'
1236                         ;; specially here, since we reread
1237                         ;; any unrecognized character.
1238                         (t
1239                          (setq this-command 'mode-exited)
1240                          (setq keep-going nil)
1241                          (setq unread-command-events
1242                                (append (listify-key-sequence key)
1243                                        unread-command-events))
1244                          (setq done t))))
1245                 ;; Record previous position for ^ when we move on.
1246                 ;; Change markers to numbers in the match data
1247                 ;; since lots of markers slow down editing.
1248                 (setq stack
1249                       (cons (cons (point)
1250                                   (or replaced (match-data t)))
1251                             stack))))))
1252
1253       ;; The code preventing adjacent regexp matches in the condition
1254       ;; of the while-loop above will haven taken us one character
1255       ;; beyond the last replacement.  Undo that.
1256       (when (and regexp-flag (not match-again) (> replace-count 0))
1257         (backward-char 1))
1258
1259       (replace-dehighlight))
1260     (or unread-command-events
1261         (message "Replaced %d occurrence%s"
1262                  replace-count
1263                  (if (= replace-count 1) "" "s")))
1264     (and keep-going stack)))
1265
1266 (defcustom query-replace-highlight t
1267   "*Non-nil means to highlight words during query replacement."
1268   :type 'boolean
1269   :group 'matching)
1270
1271 (defvar replace-overlay nil)
1272
1273 (defun replace-dehighlight ()
1274   (and replace-overlay
1275        (progn
1276          (delete-overlay replace-overlay)
1277          (setq replace-overlay nil))))
1278
1279 (defun replace-highlight (start end)
1280   (and query-replace-highlight
1281        (progn
1282          (or replace-overlay
1283              (progn
1284                (setq replace-overlay (make-overlay start end))
1285                (overlay-put replace-overlay 'face
1286                             (if (facep 'query-replace)
1287                                 'query-replace 'region))))
1288          (move-overlay replace-overlay start end (current-buffer)))))
1289
1290 ;;; replace.el ends here