lisp/replace.el

   1 ;;; replace.el --- replace commands for Emacs
   2
   3 ;; Copyright (C) 1985, 1986, 1987, 1992, 1994, 1996, 1997, 2000, 2001, 2002,
   4 ;;   2003, 2004, 2005  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 "22.1")
  66
  67 (defcustom query-replace-highlight t
  68   "*Non-nil means to highlight matches during query replacement."
  69   :type 'boolean
  70   :group 'matching)
  71
  72 (defcustom query-replace-lazy-highlight t
  73   "*Controls the lazy-highlighting during query replacements.
  74 When non-nil, all text in the buffer matching the current match
  75 is highlighted lazily using isearch lazy highlighting (see
  76 `lazy-highlight-initial-delay' and `lazy-highlight-interval')."
  77   :type 'boolean
  78   :group 'lazy-highlight
  79   :group 'matching
  80   :version "22.1")
  81
  82 (defface query-replace
  83   '((t (:inherit isearch)))
  84   "Face for highlighting query replacement matches."
  85   :group 'matching
  86   :version "22.1")
  87
  88 (defun query-replace-descr (string)
  89   (mapconcat 'isearch-text-char-description string ""))
  90
  91 (defun query-replace-read-from (string regexp-flag)
  92   "Query and return the `from' argument of a query-replace operation.
  93 The return value can also be a pair (FROM . TO) indicating that the user
  94 wants to replace FROM with TO."
  95   (if query-replace-interactive
  96       (car (if regexp-flag regexp-search-ring search-ring))
  97     (let* ((lastfrom (car (symbol-value query-replace-from-history-variable)))
  98            (lastto (car (symbol-value query-replace-to-history-variable)))
  99            (from
 100             ;; The save-excursion here is in case the user marks and copies
 101             ;; a region in order to specify the minibuffer input.
 102             ;; That should not clobber the region for the query-replace itself.
 103             (save-excursion
 104               (when (equal lastfrom lastto)
 105                 ;; Typically, this is because the two histlists are shared.
 106                 (setq lastfrom (cadr (symbol-value
 107                                       query-replace-from-history-variable))))
 108               (read-from-minibuffer
 109                (if (and lastto lastfrom)
 110                    (format "%s (default %s -> %s): " string
 111                            (query-replace-descr lastfrom)
 112                            (query-replace-descr lastto))
 113                  (format "%s: " string))
 114                nil nil nil
 115                query-replace-from-history-variable
 116                nil t t))))
 117       (if (and (zerop (length from)) lastto lastfrom)
 118           (progn
 119             (set query-replace-from-history-variable
 120                  (cdr (symbol-value query-replace-from-history-variable)))
 121             (cons lastfrom
 122                   (query-replace-compile-replacement lastto regexp-flag)))
 123         ;; Warn if user types \n or \t, but don't reject the input.
 124         (and regexp-flag
 125              (string-match "\\(\\`\\|[^\\]\\)\\(\\\\\\\\\\)*\\(\\\\[nt]\\)" from)
 126              (let ((match (match-string 3 from)))
 127                (cond
 128                 ((string= match "\\n")
 129                  (message "Note: `\\n' here doesn't match a newline; to do that, type C-q C-j instead"))
 130                 ((string= match "\\t")
 131                  (message "Note: `\\t' here doesn't match a tab; to do that, just type TAB")))
 132                (sit-for 2)))
 133         from))))
 134
 135 (defun query-replace-compile-replacement (to regexp-flag)
 136   "Maybe convert a regexp replacement TO to Lisp.
 137 Returns a list suitable for `perform-replace' if necessary,
 138 the original string if not."
 139   (if (and regexp-flag
 140            (string-match "\\(\\`\\|[^\\]\\)\\(\\\\\\\\\\)*\\\\[,#]" to))
 141       (let (pos list char)
 142         (while
 143             (progn
 144               (setq pos (match-end 0))
 145               (push (substring to 0 (- pos 2)) list)
 146               (setq char (aref to (1- pos))
 147                     to (substring to pos))
 148               (cond ((eq char ?\#)
 149                      (push '(number-to-string replace-count) list))
 150                     ((eq char ?\,)
 151                      (setq pos (read-from-string to))
 152                      (push `(replace-quote ,(car pos)) list)
 153                      (let ((end
 154                             ;; Swallow a space after a symbol
 155                             ;; if there is a space.
 156                             (if (and (or (symbolp (car pos))
 157                                          ;; Swallow a space after 'foo
 158                                          ;; but not after (quote foo).
 159                                          (and (eq (car-safe (car pos)) 'quote)
 160                                               (not (= ?\( (aref to 0)))))
 161                                      (eq (string-match " " to (cdr pos))
 162                                          (cdr pos)))
 163                                 (1+ (cdr pos))
 164                               (cdr pos))))
 165                        (setq to (substring to end)))))
 166               (string-match "\\(\\`\\|[^\\]\\)\\(\\\\\\\\\\)*\\\\[,#]" to)))
 167         (setq to (nreverse (delete "" (cons to list))))
 168         (replace-match-string-symbols to)
 169         (cons 'replace-eval-replacement
 170               (if (cdr to)
 171                   (cons 'concat to)
 172                 (car to))))
 173     to))
 174
 175
 176 (defun query-replace-read-to (from string regexp-flag)
 177   "Query and return the `to' argument of a query-replace operation."
 178   (query-replace-compile-replacement
 179    (save-excursion
 180      (read-from-minibuffer
 181       (format "%s %s with: " string (query-replace-descr from))
 182       nil nil nil
 183       query-replace-to-history-variable from t t))
 184    regexp-flag))
 185
 186 (defun query-replace-read-args (string regexp-flag &optional noerror)
 187   (unless noerror
 188     (barf-if-buffer-read-only))
 189   (let* ((from (query-replace-read-from string regexp-flag))
 190          (to (if (consp from) (prog1 (cdr from) (setq from (car from)))
 191                (query-replace-read-to from string regexp-flag))))
 192     (list from to current-prefix-arg)))
 193
 194 (defun query-replace (from-string to-string &optional delimited start end)
 195   "Replace some occurrences of FROM-STRING with TO-STRING.
 196 As each match is found, the user must type a character saying
 197 what to do with it.  For directions, type \\[help-command] at that time.
 198
 199 In Transient Mark mode, if the mark is active, operate on the contents
 200 of the region.  Otherwise, operate from point to the end of the buffer.
 201
 202 If `query-replace-interactive' is non-nil, the last incremental search
 203 string is used as FROM-STRING--you don't have to specify it with the
 204 minibuffer.
 205
 206 Matching is independent of case if `case-fold-search' is non-nil and
 207 FROM-STRING has no uppercase letters.  Replacement transfers the case
 208 pattern of the old text to the new text, if `case-replace' and
 209 `case-fold-search' are non-nil and FROM-STRING has no uppercase
 210 letters.  \(Transferring the case pattern means that if the old text
 211 matched is all caps, or capitalized, then its replacement is upcased
 212 or capitalized.)
 213
 214 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 215 only matches surrounded by word boundaries.
 216 Fourth and fifth arg START and END specify the region to operate on.
 217
 218 To customize possible responses, change the \"bindings\" in `query-replace-map'."
 219   (interactive (let ((common
 220                       (query-replace-read-args
 221                        (if (and transient-mark-mode mark-active)
 222                          "Query replace in region"
 223                          "Query replace")
 224                          nil)))
 225                  (list (nth 0 common) (nth 1 common) (nth 2 common)
 226                        ;; These are done separately here
 227                        ;; so that command-history will record these expressions
 228                        ;; rather than the values they had this time.
 229                        (if (and transient-mark-mode mark-active)
 230                            (region-beginning))
 231                        (if (and transient-mark-mode mark-active)
 232                            (region-end)))))
 233   (perform-replace from-string to-string t nil delimited nil nil start end))
 234
 235 (define-key esc-map "%" 'query-replace)
 236
 237 (defun query-replace-regexp (regexp to-string &optional delimited start end)
 238   "Replace some things after point matching REGEXP with TO-STRING.
 239 As each match is found, the user must type a character saying
 240 what to do with it.  For directions, type \\[help-command] at that time.
 241
 242 In Transient Mark mode, if the mark is active, operate on the contents
 243 of the region.  Otherwise, operate from point to the end of the buffer.
 244
 245 If `query-replace-interactive' is non-nil, the last incremental search
 246 regexp is used as REGEXP--you don't have to specify it with the
 247 minibuffer.
 248
 249 Matching is independent of case if `case-fold-search' is non-nil and
 250 REGEXP has no uppercase letters.  Replacement transfers the case
 251 pattern of the old text to the new text, if `case-replace' and
 252 `case-fold-search' are non-nil and REGEXP has no uppercase letters.
 253 \(Transferring the case pattern means that if the old text matched is
 254 all caps, or capitalized, then its replacement is upcased or
 255 capitalized.)
 256
 257 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 258 only matches surrounded by word boundaries.
 259 Fourth and fifth arg START and END specify the region to operate on.
 260
 261 In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
 262 and `\\=\\N' (where N is a digit) stands for
 263 whatever what matched the Nth `\\(...\\)' in REGEXP.
 264 `\\?' lets you edit the replacement text in the minibuffer
 265 at the given position for each replacement.
 266
 267 In interactive calls, the replacement text can contain `\\,'
 268 followed by a Lisp expression.  Each
 269 replacement evaluates that expression to compute the replacement
 270 string.  Inside of that expression, `\\&' is a string denoting the
 271 whole match as a string, `\\N' for a partial match, `\\#&' and `\\#N'
 272 for the whole or a partial match converted to a number with
 273 `string-to-number', and `\\#' itself for the number of replacements
 274 done so far (starting with zero).
 275
 276 If the replacement expression is a symbol, write a space after it
 277 to terminate it.  One space there, if any, will be discarded.
 278
 279 When using those Lisp features interactively in the replacement
 280 text, TO-STRING is actually made a list instead of a string.
 281 Use \\[repeat-complex-command] after this command for details."
 282   (interactive
 283    (let ((common
 284           (query-replace-read-args
 285            (if (and transient-mark-mode mark-active)
 286                "Query replace regexp in region"
 287              "Query replace regexp")
 288            t)))
 289      (list (nth 0 common) (nth 1 common) (nth 2 common)
 290            ;; These are done separately here
 291            ;; so that command-history will record these expressions
 292            ;; rather than the values they had this time.
 293            (if (and transient-mark-mode mark-active)
 294                (region-beginning))
 295            (if (and transient-mark-mode mark-active)
 296                (region-end)))))
 297   (perform-replace regexp to-string t t delimited nil nil start end))
 298
 299 (define-key esc-map [?\C-%] 'query-replace-regexp)
 300
 301 (defun query-replace-regexp-eval (regexp to-expr &optional delimited start end)
 302   "Replace some things after point matching REGEXP with the result of TO-EXPR.
 303 As each match is found, the user must type a character saying
 304 what to do with it.  For directions, type \\[help-command] at that time.
 305
 306 TO-EXPR is a Lisp expression evaluated to compute each replacement.  It may
 307 reference `replace-count' to get the number of replacements already made.
 308 If the result of TO-EXPR is not a string, it is converted to one using
 309 `prin1-to-string' with the NOESCAPE argument (which see).
 310
 311 For convenience, when entering TO-EXPR interactively, you can use `\\&' or
 312 `\\0' to stand for whatever matched the whole of REGEXP, and `\\N' (where
 313 N is a digit) to stand for whatever matched the Nth `\\(...\\)' in REGEXP.
 314 Use `\\#&' or `\\#N' if you want a number instead of a string.
 315 In interactive use, `\\#' in itself stands for `replace-count'.
 316
 317 In Transient Mark mode, if the mark is active, operate on the contents
 318 of the region.  Otherwise, operate from point to the end of the buffer.
 319
 320 If `query-replace-interactive' is non-nil, the last incremental search
 321 regexp is used as REGEXP--you don't have to specify it with the
 322 minibuffer.
 323
 324 Preserves case in each replacement if `case-replace' and `case-fold-search'
 325 are non-nil and REGEXP has no uppercase letters.
 326
 327 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 328 only matches that are surrounded by word boundaries.
 329 Fourth and fifth arg START and END specify the region to operate on."
 330   (interactive
 331    (progn
 332    (barf-if-buffer-read-only)
 333    (let* ((from
 334            ;; Let-bind the history var to disable the "foo -> bar" default.
 335            ;; Maybe we shouldn't disable this default, but for now I'll
 336            ;; leave it off.  --Stef
 337            (let ((query-replace-to-history-variable nil))
 338              (query-replace-read-from "Query replace regexp" t)))
 339           (to (list (read-from-minibuffer
 340                      (format "Query replace regexp %s with eval: "
 341                              (query-replace-descr from))
 342                      nil nil t query-replace-to-history-variable from t))))
 343      ;; We make TO a list because replace-match-string-symbols requires one,
 344      ;; and the user might enter a single token.
 345      (replace-match-string-symbols to)
 346      (list from (car to) current-prefix-arg
 347            (if (and transient-mark-mode mark-active)
 348                (region-beginning))
 349            (if (and transient-mark-mode mark-active)
 350                (region-end))))))
 351   (perform-replace regexp (cons 'replace-eval-replacement to-expr)
 352                    t 'literal delimited nil nil start end))
 353
 354 (defun map-query-replace-regexp (regexp to-strings &optional n start end)
 355   "Replace some matches for REGEXP with various strings, in rotation.
 356 The second argument TO-STRINGS contains the replacement strings,
 357 separated by spaces.  Third arg DELIMITED (prefix arg if interactive),
 358 if non-nil, means replace only matches surrounded by word boundaries.
 359 This command works like `query-replace-regexp' except that each
 360 successive replacement uses the next successive replacement string,
 361 wrapping around from the last such string to the first.
 362
 363 In Transient Mark mode, if the mark is active, operate on the contents
 364 of the region.  Otherwise, operate from point to the end of the buffer.
 365
 366 Non-interactively, TO-STRINGS may be a list of replacement strings.
 367
 368 If `query-replace-interactive' is non-nil, the last incremental search
 369 regexp is used as REGEXP--you don't have to specify it with the minibuffer.
 370
 371 A prefix argument N says to use each replacement string N times
 372 before rotating to the next.
 373 Fourth and fifth arg START and END specify the region to operate on."
 374   (interactive
 375    (let* ((from (if query-replace-interactive
 376                     (car regexp-search-ring)
 377                   (read-from-minibuffer "Map query replace (regexp): "
 378                                         nil nil nil
 379                                         'query-replace-history nil t)))
 380           (to (read-from-minibuffer
 381                (format "Query replace %s with (space-separated strings): "
 382                        (query-replace-descr from))
 383                nil nil nil
 384                'query-replace-history from t)))
 385      (list from to
 386            (and current-prefix-arg
 387                 (prefix-numeric-value current-prefix-arg))
 388            (if (and transient-mark-mode mark-active)
 389                (region-beginning))
 390            (if (and transient-mark-mode mark-active)
 391                (region-end)))))
 392   (let (replacements)
 393     (if (listp to-strings)
 394         (setq replacements to-strings)
 395       (while (/= (length to-strings) 0)
 396         (if (string-match " " to-strings)
 397             (setq replacements
 398                   (append replacements
 399                           (list (substring to-strings 0
 400                                            (string-match " " to-strings))))
 401                   to-strings (substring to-strings
 402                                        (1+ (string-match " " to-strings))))
 403           (setq replacements (append replacements (list to-strings))
 404                 to-strings ""))))
 405     (perform-replace regexp replacements t t nil n nil start end)))
 406
 407 (defun replace-string (from-string to-string &optional delimited start end)
 408   "Replace occurrences of FROM-STRING with TO-STRING.
 409 Preserve case in each match if `case-replace' and `case-fold-search'
 410 are non-nil and FROM-STRING has no uppercase letters.
 411 \(Preserving case means that if the string matched is all caps, or capitalized,
 412 then its replacement is upcased or capitalized.)
 413
 414 In Transient Mark mode, if the mark is active, operate on the contents
 415 of the region.  Otherwise, operate from point to the end of the buffer.
 416
 417 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 418 only matches surrounded by word boundaries.
 419 Fourth and fifth arg START and END specify the region to operate on.
 420
 421 If `query-replace-interactive' is non-nil, the last incremental search
 422 string is used as FROM-STRING--you don't have to specify it with the
 423 minibuffer.
 424
 425 This function is usually the wrong thing to use in a Lisp program.
 426 What you probably want is a loop like this:
 427   (while (search-forward FROM-STRING nil t)
 428     (replace-match TO-STRING nil t))
 429 which will run faster and will not set the mark or print anything.
 430 \(You may need a more complex loop if FROM-STRING can match the null string
 431 and TO-STRING is also null.)"
 432   (interactive
 433    (let ((common
 434           (query-replace-read-args
 435            (if (and transient-mark-mode mark-active)
 436                "Replace string in region"
 437              "Replace string")
 438            nil)))
 439      (list (nth 0 common) (nth 1 common) (nth 2 common)
 440            (if (and transient-mark-mode mark-active)
 441                (region-beginning))
 442            (if (and transient-mark-mode mark-active)
 443                (region-end)))))
 444   (perform-replace from-string to-string nil nil delimited nil nil start end))
 445
 446 (defun replace-regexp (regexp to-string &optional delimited start end)
 447   "Replace things after point matching REGEXP with TO-STRING.
 448 Preserve case in each match if `case-replace' and `case-fold-search'
 449 are non-nil and REGEXP has no uppercase letters.
 450
 451 In Transient Mark mode, if the mark is active, operate on the contents
 452 of the region.  Otherwise, operate from point to the end of the buffer.
 453
 454 Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace
 455 only matches surrounded by word boundaries.
 456 Fourth and fifth arg START and END specify the region to operate on.
 457
 458 In TO-STRING, `\\&' stands for whatever matched the whole of REGEXP,
 459 and `\\=\\N' (where N is a digit) stands for
 460 whatever what matched the Nth `\\(...\\)' in REGEXP.
 461 `\\?' lets you edit the replacement text in the minibuffer
 462 at the given position for each replacement.
 463
 464 In interactive calls, the replacement text may contain `\\,'
 465 followed by a Lisp expression used as part of the replacement
 466 text.  Inside of that expression, `\\&' is a string denoting the
 467 whole match, `\\N' a partial matches, `\\#&' and `\\#N' the
 468 respective numeric values from `string-to-number', and `\\#'
 469 itself for `replace-count', the number of replacements occured so
 470 far.
 471
 472 If your Lisp expression is an identifier and the next letter in
 473 the replacement string would be interpreted as part of it, you
 474 can wrap it with an expression like `\\,(or \\#)'.  Incidentally,
 475 for this particular case you may also enter `\\#' in the
 476 replacement text directly.
 477
 478 When using those Lisp features interactively in the replacement
 479 text, TO-STRING is actually made a list instead of a string.
 480 Use \\[repeat-complex-command] after this command for details.
 481
 482 If `query-replace-interactive' is non-nil, the last incremental search
 483 regexp is used as REGEXP--you don't have to specify it with the minibuffer.
 484
 485 This function is usually the wrong thing to use in a Lisp program.
 486 What you probably want is a loop like this:
 487   (while (re-search-forward REGEXP nil t)
 488     (replace-match TO-STRING nil nil))
 489 which will run faster and will not set the mark or print anything."
 490   (interactive
 491    (let ((common
 492           (query-replace-read-args
 493            (if (and transient-mark-mode mark-active)
 494                "Replace regexp in region"
 495              "Replace regexp")
 496            t)))
 497      (list (nth 0 common) (nth 1 common) (nth 2 common)
 498            (if (and transient-mark-mode mark-active)
 499                (region-beginning))
 500            (if (and transient-mark-mode mark-active)
 501                (region-end)))))
 502   (perform-replace regexp to-string nil t delimited nil nil start end))
 503
 504 \f
 505 (defvar regexp-history nil
 506   "History list for some commands that read regular expressions.")
 507
 508
 509 (defalias 'delete-non-matching-lines 'keep-lines)
 510 (defalias 'delete-matching-lines 'flush-lines)
 511 (defalias 'count-matches 'how-many)
 512
 513
 514 (defun keep-lines-read-args (prompt)
 515   "Read arguments for `keep-lines' and friends.
 516 Prompt for a regexp with PROMPT.
 517 Value is a list, (REGEXP)."
 518   (list (read-from-minibuffer prompt nil nil nil
 519                               'regexp-history nil t)))
 520
 521 (defun keep-lines (regexp &optional rstart rend)
 522   "Delete all lines except those containing matches for REGEXP.
 523 A match split across lines preserves all the lines it lies in.
 524 Applies to all lines after point.
 525
 526 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 527 the matching is case-sensitive.
 528
 529 Second and third arg RSTART and REND specify the region to operate on.
 530
 531 Interactively, in Transient Mark mode when the mark is active, operate
 532 on the contents of the region.  Otherwise, operate from point to the
 533 end of the buffer."
 534
 535   (interactive
 536    (progn
 537      (barf-if-buffer-read-only)
 538      (keep-lines-read-args "Keep lines (containing match for regexp): ")))
 539   (if rstart
 540       (progn
 541         (goto-char (min rstart rend))
 542         (setq rend (copy-marker (max rstart rend))))
 543     (if (and transient-mark-mode mark-active)
 544         (setq rstart (region-beginning)
 545               rend (copy-marker (region-end)))
 546       (setq rstart (point)
 547             rend (point-max-marker)))
 548     (goto-char rstart))
 549   (save-excursion
 550     (or (bolp) (forward-line 1))
 551     (let ((start (point))
 552           (case-fold-search  (and case-fold-search
 553                                   (isearch-no-upper-case-p regexp t))))
 554       (while (< (point) rend)
 555         ;; Start is first char not preserved by previous match.
 556         (if (not (re-search-forward regexp rend 'move))
 557             (delete-region start rend)
 558           (let ((end (save-excursion (goto-char (match-beginning 0))
 559                                      (beginning-of-line)
 560                                      (point))))
 561             ;; Now end is first char preserved by the new match.
 562             (if (< start end)
 563                 (delete-region start end))))
 564
 565         (setq start (save-excursion (forward-line 1) (point)))
 566         ;; If the match was empty, avoid matching again at same place.
 567         (and (< (point) rend)
 568              (= (match-beginning 0) (match-end 0))
 569              (forward-char 1))))))
 570
 571
 572 (defun flush-lines (regexp &optional rstart rend)
 573   "Delete lines containing matches for REGEXP.
 574 If a match is split across lines, all the lines it lies in are deleted.
 575 Applies to lines after point.
 576
 577 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 578 the matching is case-sensitive.
 579
 580 Second and third arg RSTART and REND specify the region to operate on.
 581
 582 Interactively, in Transient Mark mode when the mark is active, operate
 583 on the contents of the region.  Otherwise, operate from point to the
 584 end of the buffer."
 585
 586   (interactive
 587    (progn
 588      (barf-if-buffer-read-only)
 589      (keep-lines-read-args "Flush lines (containing match for regexp): ")))
 590   (if rstart
 591       (progn
 592         (goto-char (min rstart rend))
 593         (setq rend (copy-marker (max rstart rend))))
 594     (if (and transient-mark-mode mark-active)
 595         (setq rstart (region-beginning)
 596               rend (copy-marker (region-end)))
 597       (setq rstart (point)
 598             rend (point-max-marker)))
 599     (goto-char rstart))
 600   (let ((case-fold-search (and case-fold-search
 601                                (isearch-no-upper-case-p regexp t))))
 602     (save-excursion
 603       (while (and (< (point) rend)
 604                   (re-search-forward regexp rend t))
 605         (delete-region (save-excursion (goto-char (match-beginning 0))
 606                                        (beginning-of-line)
 607                                        (point))
 608                        (progn (forward-line 1) (point)))))))
 609
 610
 611 (defun how-many (regexp &optional rstart rend)
 612   "Print number of matches for REGEXP following point.
 613
 614 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 615 the matching is case-sensitive.
 616
 617 Second and third arg RSTART and REND specify the region to operate on.
 618
 619 Interactively, in Transient Mark mode when the mark is active, operate
 620 on the contents of the region.  Otherwise, operate from point to the
 621 end of the buffer."
 622
 623   (interactive
 624    (keep-lines-read-args "How many matches for (regexp): "))
 625   (save-excursion
 626     (if rstart
 627         (goto-char (min rstart rend))
 628       (if (and transient-mark-mode mark-active)
 629           (setq rstart (region-beginning)
 630                 rend (copy-marker (region-end)))
 631         (setq rstart (point)
 632               rend (point-max-marker)))
 633       (goto-char rstart))
 634     (let ((count 0)
 635           opoint
 636           (case-fold-search (and case-fold-search
 637                                  (isearch-no-upper-case-p regexp t))))
 638       (while (and (< (point) rend)
 639                   (progn (setq opoint (point))
 640                          (re-search-forward regexp rend t)))
 641         (if (= opoint (point))
 642             (forward-char 1)
 643           (setq count (1+ count))))
 644       (message "%d occurrences" count))))
 645
 646 \f
 647 (defvar occur-mode-map
 648   (let ((map (make-sparse-keymap)))
 649     (define-key map [mouse-2] 'occur-mode-mouse-goto)
 650     (define-key map "\C-c\C-c" 'occur-mode-goto-occurrence)
 651     (define-key map "\C-m" 'occur-mode-goto-occurrence)
 652     (define-key map "o" 'occur-mode-goto-occurrence-other-window)
 653     (define-key map "\C-o" 'occur-mode-display-occurrence)
 654     (define-key map "\M-n" 'occur-next)
 655     (define-key map "\M-p" 'occur-prev)
 656     (define-key map "r" 'occur-rename-buffer)
 657     (define-key map "c" 'clone-buffer)
 658     (define-key map "g" 'revert-buffer)
 659     (define-key map "q" 'quit-window)
 660     (define-key map "z" 'kill-this-buffer)
 661     (define-key map "\C-c\C-f" 'next-error-follow-minor-mode)
 662     map)
 663   "Keymap for `occur-mode'.")
 664
 665 (defvar occur-revert-arguments nil
 666   "Arguments to pass to `occur-1' to revert an Occur mode buffer.
 667 See `occur-revert-function'.")
 668
 669 (defcustom occur-mode-hook '(turn-on-font-lock)
 670   "Hook run when entering Occur mode."
 671   :type 'hook
 672   :group 'matching)
 673
 674 (defcustom occur-hook nil
 675   "Hook run when `occur' is called."
 676   :type 'hook
 677   :group 'matching)
 678
 679 (put 'occur-mode 'mode-class 'special)
 680 (defun occur-mode ()
 681   "Major mode for output from \\[occur].
 682 \\<occur-mode-map>Move point to one of the items in this buffer, then use
 683 \\[occur-mode-goto-occurrence] to go to the occurrence that the item refers to.
 684 Alternatively, click \\[occur-mode-mouse-goto] on an item to go to it.
 685
 686 \\{occur-mode-map}"
 687   (interactive)
 688   (kill-all-local-variables)
 689   (use-local-map occur-mode-map)
 690   (setq major-mode 'occur-mode)
 691   (setq mode-name "Occur")
 692   (set (make-local-variable 'revert-buffer-function) 'occur-revert-function)
 693   (make-local-variable 'occur-revert-arguments)
 694   (add-hook 'change-major-mode-hook 'font-lock-defontify nil t)
 695   (setq next-error-function 'occur-next-error)
 696   (run-hooks 'occur-mode-hook))
 697
 698 (defun occur-revert-function (ignore1 ignore2)
 699   "Handle `revert-buffer' for Occur mode buffers."
 700   (apply 'occur-1 (append occur-revert-arguments (list (buffer-name)))))
 701
 702 (defun occur-mode-mouse-goto (event)
 703   "In Occur mode, go to the occurrence whose line you click on."
 704   (interactive "e")
 705   (let (pos)
 706     (save-excursion
 707       (set-buffer (window-buffer (posn-window (event-end event))))
 708       (save-excursion
 709         (goto-char (posn-point (event-end event)))
 710         (setq pos (occur-mode-find-occurrence))))
 711     (pop-to-buffer (marker-buffer pos))
 712     (goto-char pos)))
 713
 714 (defun occur-mode-find-occurrence ()
 715   (let ((pos (get-text-property (point) 'occur-target)))
 716     (unless pos
 717       (error "No occurrence on this line"))
 718     (unless (buffer-live-p (marker-buffer pos))
 719       (error "Buffer for this occurrence was killed"))
 720     pos))
 721
 722 (defun occur-mode-goto-occurrence ()
 723   "Go to the occurrence the current line describes."
 724   (interactive)
 725   (let ((pos (occur-mode-find-occurrence)))
 726     (pop-to-buffer (marker-buffer pos))
 727     (goto-char pos)))
 728
 729 (defun occur-mode-goto-occurrence-other-window ()
 730   "Go to the occurrence the current line describes, in another window."
 731   (interactive)
 732   (let ((pos (occur-mode-find-occurrence)))
 733     (switch-to-buffer-other-window (marker-buffer pos))
 734     (goto-char pos)))
 735
 736 (defun occur-mode-display-occurrence ()
 737   "Display in another window the occurrence the current line describes."
 738   (interactive)
 739   (let ((pos (occur-mode-find-occurrence))
 740         window
 741         ;; Bind these to ensure `display-buffer' puts it in another window.
 742         same-window-buffer-names
 743         same-window-regexps)
 744     (setq window (display-buffer (marker-buffer pos)))
 745     ;; This is the way to set point in the proper window.
 746     (save-selected-window
 747       (select-window window)
 748       (goto-char pos))))
 749
 750 (defun occur-find-match (n search message)
 751   (if (not n) (setq n 1))
 752   (let ((r))
 753     (while (> n 0)
 754       (setq r (funcall search (point) 'occur-match))
 755       (and r
 756            (get-text-property r 'occur-match)
 757            (setq r (funcall search r 'occur-match)))
 758       (if r
 759           (goto-char r)
 760         (error message))
 761       (setq n (1- n)))))
 762
 763 (defun occur-next (&optional n)
 764   "Move to the Nth (default 1) next match in an Occur mode buffer."
 765   (interactive "p")
 766   (occur-find-match n #'next-single-property-change "No more matches"))
 767
 768 (defun occur-prev (&optional n)
 769   "Move to the Nth (default 1) previous match in an Occur mode buffer."
 770   (interactive "p")
 771   (occur-find-match n #'previous-single-property-change "No earlier matches"))
 772
 773 (defun occur-next-error (&optional argp reset)
 774   "Move to the Nth (default 1) next match in an Occur mode buffer.
 775 Compatibility function for \\[next-error] invocations."
 776   (interactive "p")
 777   ;; we need to run occur-find-match from within the Occur buffer
 778   (with-current-buffer
 779       ;; Choose the buffer and make it current.
 780       (if (next-error-buffer-p (current-buffer))
 781           (current-buffer)
 782         (next-error-find-buffer nil nil
 783                                 (lambda ()
 784                                   (eq major-mode 'occur-mode))))
 785
 786     (goto-char (cond (reset (point-min))
 787                      ((< argp 0) (line-beginning-position))
 788                      ((line-end-position))))
 789     (occur-find-match
 790      (abs argp)
 791      (if (> 0 argp)
 792          #'previous-single-property-change
 793        #'next-single-property-change)
 794      "No more matches")
 795     ;; In case the *Occur* buffer is visible in a nonselected window.
 796     (set-window-point (get-buffer-window (current-buffer)) (point))
 797     (occur-mode-goto-occurrence)))
 798 \f
 799 (defface match
 800   '((((class color) (min-colors 88) (background light))
 801      :background "Tan")
 802     (((class color) (min-colors 88) (background dark))
 803      :background "RoyalBlue4")
 804     (((class color) (min-colors 8))
 805      :background "blue" :foreground "white")
 806     (((type tty) (class mono))
 807      :inverse-video t)
 808     (t :background "gray"))
 809   "Face used to highlight matches permanently."
 810   :group 'matching
 811   :version "22.1")
 812
 813 (defcustom list-matching-lines-default-context-lines 0
 814   "*Default number of context lines included around `list-matching-lines' matches.
 815 A negative number means to include that many lines before the match.
 816 A positive number means to include that many lines both before and after."
 817   :type 'integer
 818   :group 'matching)
 819
 820 (defalias 'list-matching-lines 'occur)
 821
 822 (defcustom list-matching-lines-face 'match
 823   "*Face used by \\[list-matching-lines] to show the text that matches.
 824 If the value is nil, don't highlight the matching portions specially."
 825   :type 'face
 826   :group 'matching)
 827
 828 (defcustom list-matching-lines-buffer-name-face 'underline
 829   "*Face used by \\[list-matching-lines] to show the names of buffers.
 830 If the value is nil, don't highlight the buffer names specially."
 831   :type 'face
 832   :group 'matching)
 833
 834 (defun occur-accumulate-lines (count &optional keep-props)
 835   (save-excursion
 836     (let ((forwardp (> count 0))
 837           result beg end)
 838       (while (not (or (zerop count)
 839                       (if forwardp
 840                           (eobp)
 841                         (bobp))))
 842         (setq count (+ count (if forwardp -1 1)))
 843         (setq beg (line-beginning-position)
 844               end (line-end-position))
 845         (if (and keep-props (if (boundp 'jit-lock-mode) jit-lock-mode)
 846                  (text-property-not-all beg end 'fontified t))
 847             (if (fboundp 'jit-lock-fontify-now)
 848                 (jit-lock-fontify-now beg end)))
 849         (push
 850          (funcall (if keep-props
 851                       #'buffer-substring
 852                     #'buffer-substring-no-properties)
 853                   beg end)
 854          result)
 855         (forward-line (if forwardp 1 -1)))
 856       (nreverse result))))
 857
 858 (defun occur-read-primary-args ()
 859   (list (let* ((default (car regexp-history))
 860                (input
 861                 (read-from-minibuffer
 862                  (if default
 863                      (format "List lines matching regexp (default `%s'): "
 864                              (query-replace-descr default))
 865                    "List lines matching regexp: ")
 866                  nil
 867                  nil
 868                  nil
 869                  'regexp-history
 870                  default)))
 871           (if (equal input "")
 872               default
 873             input))
 874         (when current-prefix-arg
 875           (prefix-numeric-value current-prefix-arg))))
 876
 877 (defun occur-rename-buffer (&optional unique-p)
 878   "Rename the current *Occur* buffer to *Occur: original-buffer-name*.
 879 Here `original-buffer-name' is the buffer name were occur was originally run.
 880 When given the prefix argument, the renaming will not clobber the existing
 881 buffer(s) of that name, but use `generate-new-buffer-name' instead.
 882 You can add this to `occur-hook' if you always want a separate *Occur*
 883 buffer for each buffer where you invoke `occur'."
 884   (interactive "P")
 885   (with-current-buffer
 886       (if (eq major-mode 'occur-mode) (current-buffer) (get-buffer "*Occur*"))
 887     (rename-buffer (concat "*Occur: "
 888                            (mapconcat #'buffer-name
 889                                       (car (cddr occur-revert-arguments)) "/")
 890                            "*")
 891                    unique-p)))
 892
 893 (defun occur (regexp &optional nlines)
 894   "Show all lines in the current buffer containing a match for REGEXP.
 895
 896 If a match spreads across multiple lines, all those lines are shown.
 897
 898 Each line is displayed with NLINES lines before and after, or -NLINES
 899 before if NLINES is negative.
 900 NLINES defaults to `list-matching-lines-default-context-lines'.
 901 Interactively it is the prefix arg.
 902
 903 The lines are shown in a buffer named `*Occur*'.
 904 It serves as a menu to find any of the occurrences in this buffer.
 905 \\<occur-mode-map>\\[describe-mode] in that buffer will explain how.
 906
 907 If REGEXP contains upper case characters (excluding those preceded by `\\'),
 908 the matching is case-sensitive."
 909   (interactive (occur-read-primary-args))
 910   (occur-1 regexp nlines (list (current-buffer))))
 911
 912 (defun multi-occur (bufs regexp &optional nlines)
 913   "Show all lines in buffers BUFS containing a match for REGEXP.
 914 This function acts on multiple buffers; otherwise, it is exactly like
 915 `occur'."
 916   (interactive
 917    (cons
 918     (let* ((bufs (list (read-buffer "First buffer to search: "
 919                                     (current-buffer) t)))
 920            (buf nil)
 921            (ido-ignore-item-temp-list bufs))
 922       (while (not (string-equal
 923                    (setq buf (read-buffer
 924                               (if (eq read-buffer-function 'ido-read-buffer)
 925                                   "Next buffer to search (C-j to end): "
 926                                 "Next buffer to search (RET to end): ")
 927                               nil t))
 928                    ""))
 929         (add-to-list 'bufs buf)
 930         (setq ido-ignore-item-temp-list bufs))
 931       (nreverse (mapcar #'get-buffer bufs)))
 932     (occur-read-primary-args)))
 933   (occur-1 regexp nlines bufs))
 934
 935 (defun multi-occur-by-filename-regexp (bufregexp regexp &optional nlines)
 936   "Show all lines matching REGEXP in buffers named by BUFREGEXP.
 937 See also `multi-occur'."
 938   (interactive
 939    (cons
 940     (let* ((default (car regexp-history))
 941            (input
 942             (read-from-minibuffer
 943              "List lines in buffers whose filename matches regexp: "
 944              nil
 945              nil
 946              nil
 947              'regexp-history)))
 948       (if (equal input "")
 949           default
 950         input))
 951     (occur-read-primary-args)))
 952   (when bufregexp
 953     (occur-1 regexp nlines
 954              (delq nil
 955                    (mapcar (lambda (buf)
 956                              (when (and (buffer-file-name buf)
 957                                         (string-match bufregexp
 958                                                       (buffer-file-name buf)))
 959                                buf))
 960                            (buffer-list))))))
 961
 962 (defun occur-1 (regexp nlines bufs &optional buf-name)
 963   (unless buf-name
 964     (setq buf-name "*Occur*"))
 965   (let (occur-buf
 966         (active-bufs (delq nil (mapcar #'(lambda (buf)
 967                                            (when (buffer-live-p buf) buf))
 968                                        bufs))))
 969     ;; Handle the case where one of the buffers we're searching is the
 970     ;; output buffer.  Just rename it.
 971     (when (member buf-name (mapcar 'buffer-name active-bufs))
 972       (with-current-buffer (get-buffer buf-name)
 973         (rename-uniquely)))
 974
 975     ;; Now find or create the output buffer.
 976     ;; If we just renamed that buffer, we will make a new one here.
 977     (setq occur-buf (get-buffer-create buf-name))
 978
 979     (with-current-buffer occur-buf
 980       (setq buffer-read-only nil)
 981       (occur-mode)
 982       (erase-buffer)
 983       (let ((count (occur-engine
 984                     regexp active-bufs occur-buf
 985                     (or nlines list-matching-lines-default-context-lines)
 986                     (and case-fold-search
 987                          (isearch-no-upper-case-p regexp t))
 988                     list-matching-lines-buffer-name-face
 989                     nil list-matching-lines-face t)))
 990         (let* ((bufcount (length active-bufs))
 991                (diff (- (length bufs) bufcount)))
 992           (message "Searched %d buffer%s%s; %s match%s for `%s'"
 993                    bufcount (if (= bufcount 1) "" "s")
 994                    (if (zerop diff) "" (format " (%d killed)" diff))
 995                    (if (zerop count) "no" (format "%d" count))
 996                    (if (= count 1) "" "es")
 997                    regexp))
 998         (setq occur-revert-arguments (list regexp nlines bufs)
 999               buffer-read-only t)
1000         (if (> count 0)
1001             (progn
1002               (display-buffer occur-buf)
1003               (setq next-error-last-buffer occur-buf))
1004           (kill-buffer occur-buf)))
1005       (run-hooks 'occur-hook))))
1006
1007 (defun occur-engine-add-prefix (lines)
1008   (mapcar
1009    #'(lambda (line)
1010        (concat "       :" line "\n"))
1011    lines))
1012
1013 (defun occur-engine (regexp buffers out-buf nlines case-fold-search
1014                             title-face prefix-face match-face keep-props)
1015   (with-current-buffer out-buf
1016     (setq buffer-read-only nil)
1017     (let ((globalcount 0)
1018           (coding nil))
1019       ;; Map over all the buffers
1020       (dolist (buf buffers)
1021         (when (buffer-live-p buf)
1022           (let ((matches 0)     ;; count of matched lines
1023                 (lines 1)       ;; line count
1024                 (matchbeg 0)
1025                 (origpt nil)
1026                 (begpt nil)
1027                 (endpt nil)
1028                 (marker nil)
1029                 (curstring "")
1030                 (headerpt (with-current-buffer out-buf (point))))
1031             (save-excursion
1032               (set-buffer buf)
1033               (or coding
1034                   ;; Set CODING only if the current buffer locally
1035                   ;; binds buffer-file-coding-system.
1036                   (not (local-variable-p 'buffer-file-coding-system))
1037                   (setq coding buffer-file-coding-system))
1038               (save-excursion
1039                 (goto-char (point-min)) ;; begin searching in the buffer
1040                 (while (not (eobp))
1041                   (setq origpt (point))
1042                   (when (setq endpt (re-search-forward regexp nil t))
1043                     (setq matches (1+ matches)) ;; increment match count
1044                     (setq matchbeg (match-beginning 0))
1045                     (setq lines (+ lines (1- (count-lines origpt endpt))))
1046                     (save-excursion
1047                       (goto-char matchbeg)
1048                       (setq begpt (line-beginning-position)
1049                             endpt (line-end-position)))
1050                     (setq marker (make-marker))
1051                     (set-marker marker matchbeg)
1052                     (if (and keep-props
1053                              (if (boundp 'jit-lock-mode) jit-lock-mode)
1054                              (text-property-not-all begpt endpt 'fontified t))
1055                         (if (fboundp 'jit-lock-fontify-now)
1056                             (jit-lock-fontify-now begpt endpt)))
1057                     (setq curstring (buffer-substring begpt endpt))
1058                     ;; Depropertize the string, and maybe
1059                     ;; highlight the matches
1060                     (let ((len (length curstring))
1061                           (start 0))
1062                       (unless keep-props
1063                         (set-text-properties 0 len nil curstring))
1064                       (while (and (< start len)
1065                                   (string-match regexp curstring start))
1066                         (add-text-properties
1067                          (match-beginning 0) (match-end 0)
1068                          (append
1069                           `(occur-match t)
1070                           (when match-face
1071                             ;; Use `face' rather than `font-lock-face' here
1072                             ;; so as to override faces copied from the buffer.
1073                             `(face ,match-face)))
1074                          curstring)
1075                         (setq start (match-end 0))))
1076                     ;; Generate the string to insert for this match
1077                     (let* ((out-line
1078                             (concat
1079                              ;; Using 7 digits aligns tabs properly.
1080                              (apply #'propertize (format "%7d:" lines)
1081                                     (append
1082                                      (when prefix-face
1083                                        `(font-lock-face prefix-face))
1084                                      '(occur-prefix t)))
1085                              ;; We don't put `mouse-face' on the newline,
1086                              ;; because that loses.  And don't put it
1087                              ;; on context lines to reduce flicker.
1088                              (propertize curstring 'mouse-face 'highlight)
1089                              "\n"))
1090                            (data
1091                             (if (= nlines 0)
1092                                 ;; The simple display style
1093                                 out-line
1094                               ;; The complex multi-line display
1095                               ;; style.  Generate a list of lines,
1096                               ;; concatenate them all together.
1097                               (apply #'concat
1098                                      (nconc
1099                                       (occur-engine-add-prefix (nreverse (cdr (occur-accumulate-lines (- (1+ (abs nlines))) keep-props))))
1100                                       (list out-line)
1101                                       (if (> nlines 0)
1102                                           (occur-engine-add-prefix
1103                                            (cdr (occur-accumulate-lines (1+ nlines) keep-props)))))))))
1104                       ;; Actually insert the match display data
1105                       (with-current-buffer out-buf
1106                         (let ((beg (point))
1107                               (end (progn (insert data) (point))))
1108                           (unless (= nlines 0)
1109                             (insert "-------\n"))
1110                           (add-text-properties
1111                            beg end
1112                            `(occur-target ,marker help-echo "mouse-2: go to this occurrence")))))
1113                     (goto-char endpt))
1114                   (if endpt
1115                       (progn
1116                         (setq lines (1+ lines))
1117                         ;; On to the next match...
1118                         (forward-line 1))
1119                     (goto-char (point-max))))))
1120             (when (not (zerop matches)) ;; is the count zero?
1121               (setq globalcount (+ globalcount matches))
1122               (with-current-buffer out-buf
1123                 (goto-char headerpt)
1124                 (let ((beg (point))
1125                       end)
1126                   (insert (format "%d match%s for \"%s\" in buffer: %s\n"
1127                                   matches (if (= matches 1) "" "es")
1128                                   regexp (buffer-name buf)))
1129                   (setq end (point))
1130                   (add-text-properties beg end
1131                                        (append
1132                                         (when title-face
1133                                           `(font-lock-face ,title-face))
1134                                         `(occur-title ,buf))))
1135                 (goto-char (point-min)))))))
1136       (if coding
1137           ;; CODING is buffer-file-coding-system of the first buffer
1138           ;; that locally binds it.  Let's use it also for the output
1139           ;; buffer.
1140           (set-buffer-file-coding-system coding))
1141       ;; Return the number of matches
1142       globalcount)))
1143
1144 \f
1145 ;; It would be nice to use \\[...], but there is no reasonable way
1146 ;; to make that display both SPC and Y.
1147 (defconst query-replace-help
1148   "Type Space or `y' to replace one match, Delete or `n' to skip to next,
1149 RET or `q' to exit, Period to replace one match and exit,
1150 Comma to replace but not move point immediately,
1151 C-r to enter recursive edit (\\[exit-recursive-edit] to get out again),
1152 C-w to delete match and recursive edit,
1153 C-l to clear the screen, redisplay, and offer same replacement again,
1154 ! to replace all remaining matches with no more questions,
1155 ^ to move point back to previous match,
1156 E to edit the replacement string"
1157   "Help message while in `query-replace'.")
1158
1159 (defvar query-replace-map (make-sparse-keymap)
1160   "Keymap that defines the responses to questions in `query-replace'.
1161 The \"bindings\" in this map are not commands; they are answers.
1162 The valid answers include `act', `skip', `act-and-show',
1163 `exit', `act-and-exit', `edit', `delete-and-edit', `recenter',
1164 `automatic', `backup', `exit-prefix', and `help'.")
1165
1166 (define-key query-replace-map " " 'act)
1167 (define-key query-replace-map "\d" 'skip)
1168 (define-key query-replace-map [delete] 'skip)
1169 (define-key query-replace-map [backspace] 'skip)
1170 (define-key query-replace-map "y" 'act)
1171 (define-key query-replace-map "n" 'skip)
1172 (define-key query-replace-map "Y" 'act)
1173 (define-key query-replace-map "N" 'skip)
1174 (define-key query-replace-map "e" 'edit-replacement)
1175 (define-key query-replace-map "E" 'edit-replacement)
1176 (define-key query-replace-map "," 'act-and-show)
1177 (define-key query-replace-map "q" 'exit)
1178 (define-key query-replace-map "\r" 'exit)
1179 (define-key query-replace-map [return] 'exit)
1180 (define-key query-replace-map "." 'act-and-exit)
1181 (define-key query-replace-map "\C-r" 'edit)
1182 (define-key query-replace-map "\C-w" 'delete-and-edit)
1183 (define-key query-replace-map "\C-l" 'recenter)
1184 (define-key query-replace-map "!" 'automatic)
1185 (define-key query-replace-map "^" 'backup)
1186 (define-key query-replace-map "\C-h" 'help)
1187 (define-key query-replace-map [f1] 'help)
1188 (define-key query-replace-map [help] 'help)
1189 (define-key query-replace-map "?" 'help)
1190 (define-key query-replace-map "\C-g" 'quit)
1191 (define-key query-replace-map "\C-]" 'quit)
1192 (define-key query-replace-map "\e" 'exit-prefix)
1193 (define-key query-replace-map [escape] 'exit-prefix)
1194
1195 (defun replace-match-string-symbols (n)
1196   "Process a list (and any sub-lists), expanding certain symbols.
1197 Symbol  Expands To
1198 N     (match-string N)           (where N is a string of digits)
1199 #N    (string-to-number (match-string N))
1200 &     (match-string 0)
1201 #&    (string-to-number (match-string 0))
1202 #     replace-count
1203
1204 Note that these symbols must be preceeded by a backslash in order to
1205 type them."
1206   (while n
1207     (cond
1208      ((consp (car n))
1209       (replace-match-string-symbols (car n))) ;Process sub-list
1210      ((symbolp (car n))
1211       (let ((name (symbol-name (car n))))
1212         (cond
1213          ((string-match "^[0-9]+$" name)
1214           (setcar n (list 'match-string (string-to-number name))))
1215          ((string-match "^#[0-9]+$" name)
1216           (setcar n (list 'string-to-number
1217                           (list 'match-string
1218                                 (string-to-number (substring name 1))))))
1219          ((string= "&" name)
1220           (setcar n '(match-string 0)))
1221          ((string= "#&" name)
1222           (setcar n '(string-to-number (match-string 0))))
1223          ((string= "#" name)
1224           (setcar n 'replace-count))))))
1225     (setq n (cdr n))))
1226
1227 (defun replace-eval-replacement (expression replace-count)
1228   (let ((replacement (eval expression)))
1229     (if (stringp replacement)
1230         replacement
1231       (prin1-to-string replacement t))))
1232
1233 (defun replace-quote (replacement)
1234   "Quote a replacement string.
1235 This just doubles all backslashes in REPLACEMENT and
1236 returns the resulting string.  If REPLACEMENT is not
1237 a string, it is first passed through `prin1-to-string'
1238 with the `noescape' argument set.
1239
1240 `match-data' is preserved across the call."
1241   (save-match-data
1242     (replace-regexp-in-string "\\\\" "\\\\"
1243                               (if (stringp replacement)
1244                                   replacement
1245                                 (prin1-to-string replacement t))
1246                               t t)))
1247
1248 (defun replace-loop-through-replacements (data replace-count)
1249   ;; DATA is a vector contaning the following values:
1250   ;;   0 next-rotate-count
1251   ;;   1 repeat-count
1252   ;;   2 next-replacement
1253   ;;   3 replacements
1254   (if (= (aref data 0) replace-count)
1255       (progn
1256         (aset data 0 (+ replace-count (aref data 1)))
1257         (let ((next (cdr (aref data 2))))
1258           (aset data 2 (if (consp next) next (aref data 3))))))
1259   (car (aref data 2)))
1260
1261 (defun replace-match-data (integers reuse &optional new)
1262   "Like `match-data', but markers in REUSE get invalidated.
1263 If NEW is non-NIL, it is set and returned instead of fresh data,
1264 but coerced to the correct value of INTEGERS."
1265   (or (and new
1266            (progn
1267              (set-match-data new)
1268              (and (eq new reuse)
1269                   (eq (null integers) (markerp (car reuse)))
1270                   new)))
1271       (match-data integers
1272                   (prog1 reuse
1273                     (while reuse
1274                       (if (markerp (car reuse))
1275                           (set-marker (car reuse) nil))
1276                       (setq reuse (cdr reuse)))))))
1277
1278 (defun replace-match-maybe-edit (newtext fixedcase literal noedit match-data)
1279   "Make a replacement with `replace-match', editing `\\?'.
1280 NEWTEXT, FIXEDCASE, LITERAL are just passed on.  If NOEDIT is true, no
1281 check for `\\?' is made to save time.  MATCH-DATA is used for the
1282 replacement.  In case editing is done, it is changed to use markers.
1283
1284 The return value is non-NIL if there has been no `\\?' or NOEDIT was
1285 passed in.  If LITERAL is set, no checking is done, anyway."
1286   (unless (or literal noedit)
1287     (setq noedit t)
1288     (while (string-match "\\(\\`\\|[^\\]\\)\\(\\\\\\\\\\)*\\(\\\\\\?\\)"
1289                          newtext)
1290       (setq newtext
1291             (read-input "Edit replacement string: "
1292                         (prog1
1293                             (cons
1294                              (replace-match "" t t newtext 3)
1295                              (1+ (match-beginning 3)))
1296                           (setq match-data
1297                                 (replace-match-data
1298                                  nil match-data match-data))))
1299             noedit nil)))
1300   (set-match-data match-data)
1301   (replace-match newtext fixedcase literal)
1302   noedit)
1303
1304 (defun perform-replace (from-string replacements
1305                         query-flag regexp-flag delimited-flag
1306                         &optional repeat-count map start end)
1307   "Subroutine of `query-replace'.  Its complexity handles interactive queries.
1308 Don't use this in your own program unless you want to query and set the mark
1309 just as `query-replace' does.  Instead, write a simple loop like this:
1310
1311   (while (re-search-forward \"foo[ \\t]+bar\" nil t)
1312     (replace-match \"foobar\" nil nil))
1313
1314 which will run faster and probably do exactly what you want.  Please
1315 see the documentation of `replace-match' to find out how to simulate
1316 `case-replace'.
1317
1318 This function returns nil if and only if there were no matches to
1319 make, or the user didn't cancel the call."
1320   (or map (setq map query-replace-map))
1321   (and query-flag minibuffer-auto-raise
1322        (raise-frame (window-frame (minibuffer-window))))
1323   (let ((nocasify (not (and case-fold-search case-replace
1324                             (string-equal from-string
1325                                           (downcase from-string)))))
1326         (case-fold-search (and case-fold-search
1327                                (string-equal from-string
1328                                              (downcase from-string))))
1329         (literal (or (not regexp-flag) (eq regexp-flag 'literal)))
1330         (search-function (if regexp-flag 're-search-forward 'search-forward))
1331         (search-string from-string)
1332         (real-match-data nil)           ; the match data for the current match
1333         (next-replacement nil)
1334         (noedit nil)
1335         (keep-going t)
1336         (stack nil)
1337         (replace-count 0)
1338         (nonempty-match nil)
1339
1340         ;; If non-nil, it is marker saying where in the buffer to stop.
1341         (limit nil)
1342
1343         ;; Data for the next match.  If a cons, it has the same format as
1344         ;; (match-data); otherwise it is t if a match is possible at point.
1345         (match-again t)
1346
1347         (message
1348          (if query-flag
1349              (substitute-command-keys
1350               "Query replacing %s with %s: (\\<query-replace-map>\\[help] for help) "))))
1351
1352     ;; If region is active, in Transient Mark mode, operate on region.
1353     (when start
1354       (setq limit (copy-marker (max start end)))
1355       (goto-char (min start end))
1356       (deactivate-mark))
1357
1358     ;; REPLACEMENTS is either a string, a list of strings, or a cons cell
1359     ;; containing a function and its first argument.  The function is
1360     ;; called to generate each replacement like this:
1361     ;;   (funcall (car replacements) (cdr replacements) replace-count)
1362     ;; It must return a string.
1363     (cond
1364      ((stringp replacements)
1365       (setq next-replacement replacements
1366             replacements     nil))
1367      ((stringp (car replacements)) ; If it isn't a string, it must be a cons
1368       (or repeat-count (setq repeat-count 1))
1369       (setq replacements (cons 'replace-loop-through-replacements
1370                                (vector repeat-count repeat-count
1371                                        replacements replacements)))))
1372
1373     (if delimited-flag
1374         (setq search-function 're-search-forward
1375               search-string (concat "\\b"
1376                                     (if regexp-flag from-string
1377                                       (regexp-quote from-string))
1378                                     "\\b")))
1379     (when query-replace-lazy-highlight
1380       (setq isearch-lazy-highlight-last-string nil))
1381
1382     (push-mark)
1383     (undo-boundary)
1384     (unwind-protect
1385         ;; Loop finding occurrences that perhaps should be replaced.
1386         (while (and keep-going
1387                     (not (or (eobp) (and limit (>= (point) limit))))
1388                     ;; Use the next match if it is already known;
1389                     ;; otherwise, search for a match after moving forward
1390                     ;; one char if progress is required.
1391                     (setq real-match-data
1392                           (if (consp match-again)
1393                               (progn (goto-char (nth 1 match-again))
1394                                      (replace-match-data t
1395                                       real-match-data
1396                                       match-again))
1397                             (and (or match-again
1398                                      ;; MATCH-AGAIN non-nil means we
1399                                      ;; accept an adjacent match.  If
1400                                      ;; we don't, move one char to the
1401                                      ;; right.  This takes us a
1402                                      ;; character too far at the end,
1403                                      ;; but this is undone after the
1404                                      ;; while-loop.
1405                                      (progn
1406                                        (forward-char 1)
1407                                        (not (or (eobp)
1408                                                 (and limit (>= (point) limit))))))
1409                                  (funcall search-function search-string limit t)
1410                                  ;; For speed, use only integers and
1411                                  ;; reuse the list used last time.
1412                                  (replace-match-data t real-match-data)))))
1413           ;; Optionally ignore matches that have a read-only property.
1414           (unless (and query-replace-skip-read-only
1415                        (text-property-not-all
1416                         (match-beginning 0) (match-end 0)
1417                         'read-only nil))
1418
1419             ;; Record whether the match is nonempty, to avoid an infinite loop
1420             ;; repeatedly matching the same empty string.
1421             (setq nonempty-match
1422                   (/= (nth 0 real-match-data) (nth 1 real-match-data)))
1423
1424             ;; If the match is empty, record that the next one can't be
1425             ;; adjacent.
1426
1427             ;; Otherwise, if matching a regular expression, do the next
1428             ;; match now, since the replacement for this match may
1429             ;; affect whether the next match is adjacent to this one.
1430             ;; If that match is empty, don't use it.
1431             (setq match-again
1432                   (and nonempty-match
1433                        (or (not regexp-flag)
1434                            (and (looking-at search-string)
1435                                 (let ((match (match-data)))
1436                                   (and (/= (nth 0 match) (nth 1 match))
1437                                        match))))))
1438
1439             ;; Calculate the replacement string, if necessary.
1440             (when replacements
1441               (set-match-data real-match-data)
1442               (setq next-replacement
1443                     (funcall (car replacements) (cdr replacements)
1444                              replace-count)
1445                     noedit nil))
1446             (if (not query-flag)
1447                 (let ((inhibit-read-only
1448                        query-replace-skip-read-only))
1449                   (unless (or literal noedit)
1450                     (replace-highlight
1451                      (nth 0 real-match-data) (nth 1 real-match-data)
1452                      start end search-string
1453                      (or delimited-flag regexp-flag) case-fold-search))
1454                   (setq noedit
1455                         (replace-match-maybe-edit
1456                          next-replacement nocasify literal
1457                          noedit real-match-data)
1458                         replace-count (1+ replace-count)))
1459               (undo-boundary)
1460               (let (done replaced key def)
1461                 ;; Loop reading commands until one of them sets done,
1462                 ;; which means it has finished handling this
1463                 ;; occurrence.  Any command that sets `done' should
1464                 ;; leave behind proper match data for the stack.
1465                 ;; Commands not setting `done' need to adjust
1466                 ;; `real-match-data'.
1467                 (while (not done)
1468                   (set-match-data real-match-data)
1469                   (replace-highlight
1470                    (match-beginning 0) (match-end 0)
1471                    start end search-string
1472                    (or delimited-flag regexp-flag) case-fold-search)
1473                   ;; Bind message-log-max so we don't fill up the message log
1474                   ;; with a bunch of identical messages.
1475                   (let ((message-log-max nil))
1476                     (message message
1477                              (query-replace-descr from-string)
1478                              (query-replace-descr next-replacement)))
1479                   (setq key (read-event))
1480                   ;; Necessary in case something happens during read-event
1481                   ;; that clobbers the match data.
1482                   (set-match-data real-match-data)
1483                   (setq key (vector key))
1484                   (setq def (lookup-key map key))
1485                   ;; Restore the match data while we process the command.
1486                   (cond ((eq def 'help)
1487                          (with-output-to-temp-buffer "*Help*"
1488                            (princ
1489                             (concat "Query replacing "
1490                                     (if regexp-flag "regexp " "")
1491                                     from-string " with "
1492                                     next-replacement ".\n\n"
1493                                     (substitute-command-keys
1494                                      query-replace-help)))
1495                            (with-current-buffer standard-output
1496                              (help-mode))))
1497                         ((eq def 'exit)
1498                          (setq keep-going nil)
1499                          (setq done t))
1500                         ((eq def 'backup)
1501                          (if stack
1502                              (let ((elt (pop stack)))
1503                                (goto-char (nth 0 elt))
1504                                (setq replaced (nth 1 elt)
1505                                      real-match-data
1506                                      (replace-match-data
1507                                       t real-match-data
1508                                       (nth 2 elt))))
1509                            (message "No previous match")
1510                            (ding 'no-terminate)
1511                            (sit-for 1)))
1512                         ((eq def 'act)
1513                          (or replaced
1514                              (setq noedit
1515                                    (replace-match-maybe-edit
1516                                     next-replacement nocasify literal
1517                                     noedit real-match-data)
1518                                    replace-count (1+ replace-count)))
1519                          (setq done t replaced t))
1520                         ((eq def 'act-and-exit)
1521                          (or replaced
1522                              (setq noedit
1523                                    (replace-match-maybe-edit
1524                                     next-replacement nocasify literal
1525                                     noedit real-match-data)
1526                                    replace-count (1+ replace-count)))
1527                          (setq keep-going nil)
1528                          (setq done t replaced t))
1529                         ((eq def 'act-and-show)
1530                          (if (not replaced)
1531                              (setq noedit
1532                                    (replace-match-maybe-edit
1533                                     next-replacement nocasify literal
1534                                     noedit real-match-data)
1535                                    replace-count (1+ replace-count)
1536                                    real-match-data (replace-match-data
1537                                                     t real-match-data)
1538                                    replaced t)))
1539                         ((eq def 'automatic)
1540                          (or replaced
1541                              (setq noedit
1542                                    (replace-match-maybe-edit
1543                                     next-replacement nocasify literal
1544                                     noedit real-match-data)
1545                                    replace-count (1+ replace-count)))
1546                          (setq done t query-flag nil replaced t))
1547                         ((eq def 'skip)
1548                          (setq done t))
1549                         ((eq def 'recenter)
1550                          (recenter nil))
1551                         ((eq def 'edit)
1552                          (let ((opos (point-marker)))
1553                            (setq real-match-data (replace-match-data
1554                                                   nil real-match-data
1555                                                   real-match-data))
1556                            (goto-char (match-beginning 0))
1557                            (save-excursion
1558                              (save-window-excursion
1559                                (recursive-edit)))
1560                            (goto-char opos)
1561                            (set-marker opos nil))
1562                          ;; Before we make the replacement,
1563                          ;; decide whether the search string
1564                          ;; can match again just after this match.
1565                          (if (and regexp-flag nonempty-match)
1566                              (setq match-again (and (looking-at search-string)
1567                                                     (match-data)))))
1568                         ;; Edit replacement.
1569                         ((eq def 'edit-replacement)
1570                          (setq real-match-data (replace-match-data
1571                                                 nil real-match-data
1572                                                 real-match-data)
1573                                next-replacement
1574                                (read-input "Edit replacement string: "
1575                                            next-replacement)
1576                                noedit nil)
1577                          (if replaced
1578                              (set-match-data real-match-data)
1579                            (setq noedit
1580                                  (replace-match-maybe-edit
1581                                   next-replacement nocasify literal noedit
1582                                   real-match-data)
1583                                  replaced t))
1584                          (setq done t))
1585
1586                         ((eq def 'delete-and-edit)
1587                          (replace-match "" t t)
1588                          (setq real-match-data (replace-match-data
1589                                                 nil real-match-data))
1590                          (replace-dehighlight)
1591                          (save-excursion (recursive-edit))
1592                          (setq replaced t))
1593                         ;; Note: we do not need to treat `exit-prefix'
1594                         ;; specially here, since we reread
1595                         ;; any unrecognized character.
1596                         (t
1597                          (setq this-command 'mode-exited)
1598                          (setq keep-going nil)
1599                          (setq unread-command-events
1600                                (append (listify-key-sequence key)
1601                                        unread-command-events))
1602                          (setq done t)))
1603                   (when query-replace-lazy-highlight
1604                     ;; Force lazy rehighlighting only after replacements
1605                     (if (not (memq def '(skip backup)))
1606                         (setq isearch-lazy-highlight-last-string nil))))
1607                 ;; Record previous position for ^ when we move on.
1608                 ;; Change markers to numbers in the match data
1609                 ;; since lots of markers slow down editing.
1610                 (push (list (point) replaced
1611 ;;; If the replacement has already happened, all we need is the
1612 ;;; current match start and end.  We could get this with a trivial
1613 ;;; match like
1614 ;;; (save-excursion (goto-char (match-beginning 0))
1615 ;;;                 (search-forward (match-string 0))
1616 ;;;                 (match-data t))
1617 ;;; if we really wanted to avoid manually constructing match data.
1618 ;;; Adding current-buffer is necessary so that match-data calls can
1619 ;;; return markers which are appropriate for editing.
1620                             (if replaced
1621                                 (list
1622                                  (match-beginning 0)
1623                                  (match-end 0)
1624                                  (current-buffer))
1625                               (match-data t)))
1626                       stack)))))
1627
1628       ;; The code preventing adjacent regexp matches in the condition
1629       ;; of the while-loop above will haven taken us one character
1630       ;; beyond the last replacement.  Undo that.
1631       (when (and regexp-flag (not match-again) (> replace-count 0))
1632         (backward-char 1))
1633
1634       (replace-dehighlight))
1635     (or unread-command-events
1636         (message "Replaced %d occurrence%s"
1637                  replace-count
1638                  (if (= replace-count 1) "" "s")))
1639     (and keep-going stack)))
1640
1641 (defvar replace-overlay nil)
1642
1643 (defun replace-highlight (match-beg match-end range-beg range-end
1644                           string regexp case-fold)
1645   (if query-replace-highlight
1646       (if replace-overlay
1647           (move-overlay replace-overlay match-beg match-end (current-buffer))
1648         (setq replace-overlay (make-overlay match-beg match-end))
1649         (overlay-put replace-overlay 'priority 1) ;higher than lazy overlays
1650         (overlay-put replace-overlay 'face 'query-replace)))
1651   (if query-replace-lazy-highlight
1652       (let ((isearch-string string)
1653             (isearch-regexp regexp)
1654             (isearch-case-fold-search case-fold))
1655         (isearch-lazy-highlight-new-loop range-beg range-end))))
1656
1657 (defun replace-dehighlight ()
1658   (when replace-overlay
1659     (delete-overlay replace-overlay))
1660   (when query-replace-lazy-highlight
1661     (lazy-highlight-cleanup lazy-highlight-cleanup)
1662     (setq isearch-lazy-highlight-last-string nil)))
1663
1664 ;; arch-tag: 16b4cd61-fd40-497b-b86f-b667c4cf88e4
1665 ;;; replace.el ends here