lisp/isearch.el

   1 ;;; isearch.el --- incremental search minor mode.
   2
   3 ;; Copyright (C) 1992, 1993 Free Software Foundation, Inc.
   4
   5 ;; Author: Daniel LaLiberte <liberte@cs.uiuc.edu>
   6
   7 ;; |$Date: 1994/01/19 18:45:34 $|$Revision: 1.63 $
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is distributed in the hope that it will be useful,
  12 ;; but WITHOUT ANY WARRANTY.  No author or distributor
  13 ;; accepts responsibility to anyone for the consequences of using it
  14 ;; or for whether it serves any particular purpose or works at all,
  15 ;; unless he says so in writing.  Refer to the GNU Emacs General Public
  16 ;; License for full details.
  17
  18 ;; Everyone is granted permission to copy, modify and redistribute
  19 ;; GNU Emacs, but only under the conditions described in the
  20 ;; GNU Emacs General Public License.   A copy of this license is
  21 ;; supposed to have been given to you along with GNU Emacs so you
  22 ;; can know your rights and responsibilities.  It should be in a
  23 ;; file named COPYING.  Among other things, the copyright notice
  24 ;; and this notice must be preserved on all copies.
  25
  26 ;;; Commentary:
  27
  28 ;;;====================================================================
  29 ;; Instructions
  30
  31 ;; For programmed use of isearch-mode, e.g. calling (isearch-forward),
  32 ;; isearch-mode behaves modally and does not return until the search
  33 ;; is completed.  It uses a recursive-edit to behave this way.  Note:
  34 ;; gnus does it wrong: (call-interactively 'isearch-forward).
  35
  36 ;; The key bindings active within isearch-mode are defined below in
  37 ;; `isearch-mode-map' which is given bindings close to the default
  38 ;; characters of the original isearch.el.  With `isearch-mode',
  39 ;; however, you can bind multi-character keys and it should be easier
  40 ;; to add new commands.  One bug though: keys with meta-prefix cannot
  41 ;; be longer than two chars.  Also see minibuffer-local-isearch-map
  42 ;; for bindings active during `isearch-edit-string'.
  43
  44 ;; Note to emacs version 19 users: isearch-mode should work even if
  45 ;; you switch windows with the mouse, in which case isearch-mode is
  46 ;; terminated automatically before the switch.  This is true of lemacs
  47 ;; too, with a few more cleanups I've neglected in this release.
  48 ;; No one has supplied patches for epoch yet.
  49
  50 ;; The search ring and completion commands automatically put you in
  51 ;; the minibuffer to edit the string.  This gives you a chance to
  52 ;; modify the search string before executing the search.  There are
  53 ;; three commands to terminate the editing: C-s and C-r exit the
  54 ;; minibuffer and search forward and reverse respectively, while C-m
  55 ;; exits and does a nonincremental search.
  56
  57 ;; Exiting immediately from isearch uses isearch-edit-string instead
  58 ;; of nonincremental-search, if search-nonincremental-instead is non-nil.
  59 ;; The name of this option should probably be changed if we decide to
  60 ;; keep the behavior.  No point in forcing nonincremental search until
  61 ;; the last possible moment.
  62
  63 ;; TODO
  64 ;; - Integrate the emacs 19 generalized command history.
  65 ;; - Think about incorporating query-replace.
  66 ;; - Hooks and options for failed search.
  67
  68 ;;; Change Log:
  69
  70 ;;; Changes before those recorded in ChangeLog:
  71
  72 ;;; Revision 1.4  92/09/14  16:26:02  liberte
  73 ;;; Added prefix args to isearch-forward, etc. to switch between
  74 ;;;    string and regular expression searching.
  75 ;;; Added some support for lemacs.
  76 ;;; Added general isearch-highlight option - but only for lemacs so far.
  77 ;;; Added support for frame switching in emacs 19.
  78 ;;; Added word search option to isearch-edit-string.
  79 ;;; Renamed isearch-quit to isearch-abort.
  80 ;;; Numerous changes to comments and doc strings.
  81 ;;;
  82 ;;; Revision 1.3  92/06/29  13:10:08  liberte
  83 ;;; Moved modal isearch-mode handling into isearch-mode.
  84 ;;; Got rid of buffer-local isearch variables.
  85 ;;; isearch-edit-string used by ring adjustments, completion, and
  86 ;;; nonincremental searching.  C-s and C-r are additional exit commands.
  87 ;;; Renamed all regex to regexp.
  88 ;;; Got rid of found-start and found-point globals.
  89 ;;; Generalized handling of upper-case chars.
  90
  91 ;;; Revision 1.2  92/05/27  11:33:57  liberte
  92 ;;; Emacs version 19 has a search ring, which is supported here.
  93 ;;; Other fixes found in the version 19 isearch are included here.
  94 ;;;
  95 ;;; Also see variables search-caps-disable-folding,
  96 ;;; search-nonincremental-instead, search-whitespace-regexp, and
  97 ;;; commands isearch-toggle-regexp, isearch-edit-string.
  98 ;;;
  99 ;;; semi-modal isearching is supported.
 100
 101 ;;; Changes for 1.1
 102 ;;; 3/18/92 Fixed invalid-regexp.
 103 ;;; 3/18/92 Fixed yanking in regexps.
 104
 105 ;;; Code:
 106
 107 \f
 108 ;;;=========================================================================
 109 ;;; Emacs features
 110
 111 ;; isearch-mode takes advantage of the features provided by several
 112 ;; different versions of emacs.  Rather than testing the version of
 113 ;; emacs, several constants are defined, one for each of the features.
 114 ;; Each of the tests below must work on any version of emacs.
 115 ;; (Perhaps provide and featurep could be used for this purpose.)
 116
 117 (defconst isearch-gnu-emacs-events (fboundp 'set-frame-height)) ;; emacs 19
 118 (defconst isearch-pre-command-hook-exists (boundp 'pre-command-hook)) ;; lemacs
 119 (defconst isearch-event-data-type nil)  ;; lemacs
 120
 121 (defconst search-exit-option t
 122   "*Non-nil means random control characters terminate incremental search.")
 123
 124 (defvar search-slow-window-lines 1
 125   "*Number of lines in slow search display windows.
 126 These are the short windows used during incremental search on slow terminals.
 127 Negative means put the slow search window at the top (normally it's at bottom)
 128 and the value is minus the number of lines.")
 129
 130 (defvar search-slow-speed 1200
 131   "*Highest terminal speed at which to use \"slow\" style incremental search.
 132 This is the style where a one-line window is created to show the line
 133 that the search has reached.")
 134
 135 ;;;========================================================================
 136 ;;; Some additional options and constants.
 137
 138 (defvar search-upper-case 'not-yanks
 139   "*If non-nil, upper case chars disable case fold searching.
 140 That is, upper and lower case chars must match exactly.
 141 This applies no matter where the chars come from, but does not
 142 apply to chars in regexps that are prefixed with `\\'.
 143 If this value is `not-yanks', yanked text is always downcased.")
 144
 145 (defvar search-nonincremental-instead t
 146   "*If non-nil, do a nonincremental search instead if exiting immediately.
 147 Actually, `isearch-edit-string' is called to let you enter the search
 148 string, and RET terminates editing and does a nonincremental search.")
 149
 150 (defconst search-whitespace-regexp "\\s-+"
 151   "*If non-nil, regular expression to match a sequence of whitespace chars.
 152 You might want to use something like \"[ \\t\\r\\n]+\" instead.")
 153
 154 ;; I removed the * from the doc string because highlighting is not
 155 ;; currently a clean thing to do.  Once highlighting is made clean,
 156 ;; this feature can be re-enabled and advertised.
 157 (defvar search-highlight nil
 158   "*Non-nil means incremental search highlights the current match.")
 159
 160 (defvar isearch-mode-hook nil
 161   "Function(s) to call after starting up an incremental search.")
 162
 163 (defvar isearch-mode-end-hook nil
 164   "Function(s) to call after terminating an incremental search.")
 165
 166 ;;;==================================================================
 167 ;;; Search ring.
 168
 169 (defvar search-ring nil
 170   "List of search string sequences.")
 171 (defvar regexp-search-ring nil
 172   "List of regular expression search string sequences.")
 173
 174 (defconst search-ring-max 16
 175   "*Maximum length of search ring before oldest elements are thrown away.")
 176 (defconst regexp-search-ring-max 16
 177   "*Maximum length of regexp search ring before oldest elements are thrown away.")
 178
 179 (defvar search-ring-yank-pointer nil
 180   "Index in `search-ring' of last string reused.
 181 nil if none yet.")
 182 (defvar regexp-search-ring-yank-pointer nil
 183   "Index in `regexp-search-ring' of last string reused.
 184 nil if none yet.")
 185
 186 (defvar search-ring-update nil
 187   "*Non-nil if advancing or retreating in the search ring should cause search.
 188 Default value, nil, means edit the string instead.")
 189
 190 ;;;====================================================
 191 ;;; Define isearch-mode keymap.
 192
 193 (defvar isearch-mode-map nil
 194   "Keymap for isearch-mode.")
 195
 196 (or isearch-mode-map
 197     (let* ((i 0)
 198            (map (make-keymap)))
 199       (or (vectorp (nth 1 map))
 200           (error "The initialization of isearch-mode-map must be updated"))
 201       ;; Give this map a vector 256 long, for dense binding
 202       ;; of a larger range of ordinary characters.
 203       (setcar (cdr map) (make-vector 256 nil))
 204
 205       ;; Make function keys, etc, exit the search.
 206       (define-key map [t] 'isearch-other-control-char)
 207       ;; Control chars, by default, end isearch mode transparently.
 208       ;; We need these explicit definitions because, in a dense keymap,
 209       ;; the binding for t does not affect characters.
 210       ;; We use a dense keymap to save space.
 211       (while (< i ?\ )
 212         (define-key map (make-string 1 i) 'isearch-other-control-char)
 213         (setq i (1+ i)))
 214
 215       ;; Printing chars extend the search string by default.
 216       (setq i ?\ )
 217       (while (< i (length (nth 1 map)))
 218         (define-key map (vector i) 'isearch-printing-char)
 219         (setq i (1+ i)))
 220
 221       ;; Several non-printing chars change the searching behavior.
 222       (define-key map "\C-s" 'isearch-repeat-forward)
 223       (define-key map "\C-r" 'isearch-repeat-backward)
 224       (define-key map "\177" 'isearch-delete-char)
 225       (define-key map "\C-g" 'isearch-abort)
 226
 227       (define-key map "\C-q" 'isearch-quote-char)
 228
 229       (define-key map "\r" 'isearch-exit)
 230       (define-key map "\C-j" 'isearch-printing-char)
 231       (define-key map "\t" 'isearch-printing-char)
 232       (define-key map " " 'isearch-whitespace-chars)
 233
 234       (define-key map "\C-w" 'isearch-yank-word)
 235       (define-key map "\C-y" 'isearch-yank-line)
 236       (define-key map [mouse-2] 'isearch-yank-kill)
 237       ;; This overrides the default binding for t.
 238       (define-key map [down-mouse-2] 'nil)
 239
 240       ;; Bind the ASCII-equivalent "function keys" explicitly
 241       ;; if we bind their equivalents,
 242       ;; since otherwise the default binding would override.
 243       ;; We bind [escape] below.
 244       (define-key map [tab] 'isearch-printing-char)
 245       (define-key map [kp-0] 'isearch-printing-char)
 246       (define-key map [kp-1] 'isearch-printing-char)
 247       (define-key map [kp-2] 'isearch-printing-char)
 248       (define-key map [kp-3] 'isearch-printing-char)
 249       (define-key map [kp-4] 'isearch-printing-char)
 250       (define-key map [kp-5] 'isearch-printing-char)
 251       (define-key map [kp-6] 'isearch-printing-char)
 252       (define-key map [kp-7] 'isearch-printing-char)
 253       (define-key map [kp-8] 'isearch-printing-char)
 254       (define-key map [kp-9] 'isearch-printing-char)
 255       (define-key map [kp-add] 'isearch-printing-char)
 256       (define-key map [kp-subtract] 'isearch-printing-char)
 257       (define-key map [kp-multiply] 'isearch-printing-char)
 258       (define-key map [kp-divide] 'isearch-printing-char)
 259       (define-key map [kp-decimal] 'isearch-printing-char)
 260       (define-key map [kp-separator] 'isearch-printing-char)
 261       (define-key map [kp-equal] 'isearch-printing-char)
 262       (define-key map [kp-tab] 'isearch-printing-char)
 263       (define-key map [kp-space] 'isearch-printing-char)
 264       (define-key map [kp-enter] 'isearch-exit)
 265       (define-key map [delete] 'isearch-delete-char)
 266       (define-key map [backspace] 'isearch-delete-char)
 267       (define-key map [return] 'isearch-exit)
 268       (define-key map [newline] 'isearch-printing-char)
 269
 270       ;; Define keys for regexp chars * ? |.
 271       ;; Nothing special for + because it matches at least once.
 272       (define-key map "*" 'isearch-*-char)
 273       (define-key map "?" 'isearch-*-char)
 274       (define-key map "|" 'isearch-|-char)
 275
 276 ;;; Turned off because I find I expect to get the global definition--rms.
 277 ;;;      ;; Instead bind C-h to special help command for isearch-mode.
 278 ;;;      (define-key map "\C-h" 'isearch-mode-help)
 279
 280       ;; To handle local bindings with meta char prefix keys, define
 281       ;; another full keymap.  This must be done for any other prefix
 282       ;; keys as well, one full keymap per char of the prefix key.  It
 283       ;; would be simpler to disable the global keymap, and/or have a
 284       ;; default local key binding for any key not otherwise bound.
 285       (let ((meta-map (make-sparse-keymap)))
 286         (define-key map (char-to-string meta-prefix-char) meta-map)
 287         (define-key map [escape] meta-map))
 288       (define-key map (vector meta-prefix-char t) 'isearch-other-meta-char)
 289
 290       (define-key map "\M-n" 'isearch-ring-advance)
 291       (define-key map "\M-p" 'isearch-ring-retreat)
 292       (define-key map "\M-y" 'isearch-yank-kill)
 293
 294       (define-key map "\M-\t" 'isearch-complete)
 295
 296       ;; For emacs 19, switching frames should terminate isearch-mode
 297       (if isearch-gnu-emacs-events
 298           (define-key map [switch-frame] 'isearch-switch-frame-handler))
 299
 300       (setq isearch-mode-map map)
 301       ))
 302
 303 ;; Some bindings you may want to put in your isearch-mode-hook.
 304 ;; Suggest some alternates...
 305 ;; (define-key isearch-mode-map "\C-t" 'isearch-toggle-regexp)
 306 ;; (define-key isearch-mode-map "\C-^" 'isearch-edit-string)
 307
 308
 309 (defvar minibuffer-local-isearch-map nil
 310   "Keymap for editing isearch strings in the minibuffer.")
 311
 312 (or minibuffer-local-isearch-map
 313     (let ((map (copy-keymap minibuffer-local-map)))
 314       (define-key map "\r" 'isearch-nonincremental-exit-minibuffer)
 315       (define-key map "\M-n" 'isearch-ring-advance-edit)
 316       (define-key map "\M-p" 'isearch-ring-retreat-edit)
 317       (define-key map "\M-\t" 'isearch-complete-edit)
 318       (define-key map "\C-s" 'isearch-forward-exit-minibuffer)
 319       (define-key map "\C-r" 'isearch-reverse-exit-minibuffer)
 320       (setq minibuffer-local-isearch-map map)
 321       ))
 322
 323 ;;;========================================================
 324 ;; Internal variables declared globally for byte-compiler.
 325 ;; These are all set with setq while isearching
 326 ;; and bound locally while editing the search string.
 327
 328 (defvar isearch-forward nil)    ; Searching in the forward direction.
 329 (defvar isearch-regexp nil)     ; Searching for a regexp.
 330 (defvar isearch-word nil)       ; Searching for words.
 331
 332 (defvar isearch-cmds nil)   ; Stack of search status sets.
 333 (defvar isearch-string "")  ; The current search string.
 334 (defvar isearch-message "") ; text-char-description version of isearch-string
 335
 336 (defvar isearch-success t)              ; Searching is currently successful.
 337 (defvar isearch-invalid-regexp nil)     ; Regexp not well formed.
 338 (defvar isearch-within-brackets nil)    ; Regexp has unclosed [.
 339 (defvar isearch-other-end nil)  ; Start (end) of match if forward (backward).
 340 (defvar isearch-wrapped nil)    ; Searching restarted from the top (bottom).
 341 (defvar isearch-barrier 0)
 342
 343 (defvar isearch-case-fold-search nil) ; case-fold-search while searching.
 344
 345 (defvar isearch-adjusted nil)
 346 (defvar isearch-slow-terminal-mode nil)
 347 ;;; If t, using a small window.
 348 (defvar isearch-small-window nil)
 349 (defvar isearch-opoint 0)
 350 ;;; The window configuration active at the beginning of the search.
 351 (defvar isearch-window-configuration nil)
 352
 353 ;; Flag to indicate a yank occurred, so don't move the cursor.
 354 (defvar isearch-yank-flag nil)
 355
 356 ;;; A function to be called after each input character is processed.
 357 ;;; (It is not called after characters that exit the search.)
 358 ;;; It is only set from an optional argument to `isearch-mode'.
 359 (defvar isearch-op-fun nil)
 360
 361 ;;;  Is isearch-mode in a recursive edit for modal searching.
 362 (defvar isearch-recursive-edit nil)
 363
 364 ;;; Should isearch be terminated after doing one search?
 365 (defvar isearch-nonincremental nil)
 366
 367 ;; New value of isearch-forward after isearch-edit-string.
 368 (defvar isearch-new-forward nil)
 369
 370
 371 ;;;==============================================================
 372 ;; Minor-mode-alist changes - kind of redundant with the
 373 ;; echo area, but if isearching in multiple windows, it can be useful.
 374
 375 (or (assq 'isearch-mode minor-mode-alist)
 376     (nconc minor-mode-alist
 377            (list '(isearch-mode isearch-mode))))
 378
 379 (defvar isearch-mode nil) ;; Name of the minor mode, if non-nil.
 380 (make-variable-buffer-local 'isearch-mode)
 381
 382 (define-key global-map "\C-s" 'isearch-forward)
 383 (define-key esc-map "\C-s" 'isearch-forward-regexp)
 384 (define-key global-map "\C-r" 'isearch-backward)
 385 (define-key esc-map "\C-r" 'isearch-backward-regexp)
 386
 387 ;;;===============================================================
 388 ;;; Entry points to isearch-mode.
 389 ;;; These four functions should replace those in loaddefs.el
 390 ;;; An alternative is to defalias isearch-forward etc to isearch-mode,
 391 ;;; and look at this-command to set the options accordingly.
 392
 393 (defun isearch-forward (&optional regexp-p no-recursive-edit)
 394   "\
 395 Do incremental search forward.
 396 With a prefix argument, do an incremental regular expression search instead.
 397 \\<isearch-mode-map>
 398 As you type characters, they add to the search string and are found.
 399 The following non-printing keys are bound in `isearch-mode-map'.
 400
 401 Type \\[isearch-delete-char] to cancel characters from end of search string.
 402 Type \\[isearch-exit] to exit, leaving point at location found.
 403 Type LFD (C-j) to match end of line.
 404 Type \\[isearch-repeat-forward] to search again forward,\
 405  \\[isearch-repeat-backward] to search again backward.
 406 Type \\[isearch-yank-word] to yank word from buffer onto end of search\
 407  string and search for it.
 408 Type \\[isearch-yank-line] to yank rest of line onto end of search string\
 409  and search for it.
 410 Type \\[isearch-quote-char] to quote control character to search for it.
 411 \\[isearch-abort] while searching or when search has failed cancels input\
 412  back to what has
 413  been found successfully.
 414 \\[isearch-abort] when search is successful aborts and moves point to\
 415  starting point.
 416
 417 Also supported is a search ring of the previous 16 search strings.
 418 Type \\[isearch-ring-advance] to search for the next item in the search ring.
 419 Type \\[isearch-ring-retreat] to search for the previous item in the search\
 420  ring.
 421 Type \\[isearch-complete] to complete the search string using the search ring.
 422
 423 The above keys, bound in `isearch-mode-map', are often controlled by
 424  options; do M-x apropos on search-.* to find them.
 425 Other control and meta characters terminate the search
 426  and are then executed normally (depending on `search-exit-option').
 427
 428 If this function is called non-interactively, it does not return to
 429 the calling function until the search is done."
 430
 431   (interactive "P\np")
 432   (isearch-mode t (not (null regexp-p)) nil (not no-recursive-edit)))
 433
 434 (defun isearch-forward-regexp (&optional not-regexp no-recursive-edit)
 435   "\
 436 Do incremental search forward for regular expression.
 437 With a prefix argument, do a regular string search instead.
 438 Like ordinary incremental search except that your input
 439 is treated as a regexp.  See \\[isearch-forward] for more info."
 440   (interactive "P\np")
 441   (isearch-mode t (null not-regexp) nil (not no-recursive-edit)))
 442
 443 (defun isearch-backward (&optional regexp-p no-recursive-edit)
 444   "\
 445 Do incremental search backward.
 446 With a prefix argument, do a regular expression search instead.
 447 See \\[isearch-forward] for more information."
 448   (interactive "P\np")
 449   (isearch-mode nil (not (null regexp-p)) nil (not no-recursive-edit)))
 450
 451 (defun isearch-backward-regexp (&optional not-regexp no-recursive-edit)
 452   "\
 453 Do incremental search backward for regular expression.
 454 With a prefix argument, do a regular string search instead.
 455 Like ordinary incremental search except that your input
 456 is treated as a regexp.  See \\[isearch-forward] for more info."
 457   (interactive "P\np")
 458   (isearch-mode nil (null not-regexp) nil (not no-recursive-edit)))
 459
 460
 461 (defun isearch-mode-help ()
 462   (interactive)
 463   (describe-function 'isearch-forward)
 464   (isearch-update))
 465
 466 \f
 467 ;;;==================================================================
 468 ;; isearch-mode only sets up incremental search for the minor mode.
 469 ;; All the work is done by the isearch-mode commands.
 470
 471 ;; Not used yet:
 472 ;;(defconst isearch-commands '(isearch-forward isearch-backward
 473 ;;                           isearch-forward-regexp isearch-backward-regexp)
 474 ;;  "List of commands for which isearch-mode does not recursive-edit.")
 475
 476
 477 (defun isearch-mode (forward &optional regexp op-fun recursive-edit word-p)
 478   "Start isearch minor mode.  Called by isearch-forward, etc."
 479
 480   ;; Initialize global vars.
 481   (setq isearch-forward forward
 482         isearch-regexp regexp
 483         isearch-word word-p
 484         isearch-op-fun op-fun
 485         isearch-case-fold-search case-fold-search
 486         isearch-string ""
 487         isearch-message ""
 488         isearch-cmds nil
 489         isearch-success t
 490         isearch-wrapped nil
 491         isearch-barrier (point)
 492         isearch-adjusted nil
 493         isearch-yank-flag nil
 494         isearch-invalid-regexp nil
 495         isearch-within-brackets nil
 496         ;; Use (baud-rate) for now, for sake of other versions.
 497         isearch-slow-terminal-mode (and (<= (baud-rate) search-slow-speed)
 498                                         (> (window-height)
 499                                            (* 4 search-slow-window-lines)))
 500         isearch-other-end nil
 501         isearch-small-window nil
 502
 503         isearch-opoint (point)
 504         search-ring-yank-pointer nil
 505         regexp-search-ring-yank-pointer nil)
 506   (setq isearch-window-configuration
 507         (if isearch-slow-terminal-mode (current-window-configuration) nil))
 508
 509 ;; This was for Lucid Emacs.  But now that we have pre-command-hook,
 510 ;; it causes trouble.
 511 ;;  (if isearch-pre-command-hook-exists
 512 ;;      (add-hook 'pre-command-hook 'isearch-pre-command-hook))
 513   (setq isearch-mode " Isearch")  ;; forward? regexp?
 514   (set-buffer-modified-p (buffer-modified-p)) ; update modeline
 515
 516   ;; It is ugly to show region highlighting while the search
 517   ;; is going on.  And we don't want the mark active at the end either.
 518   (setq deactivate-mark t)
 519
 520   (isearch-push-state)
 521
 522   (make-local-variable 'overriding-local-map)
 523   (setq overriding-local-map isearch-mode-map)
 524   (isearch-update)
 525   (run-hooks 'isearch-mode-hook)
 526
 527   ;; isearch-mode can be made modal (in the sense of not returning to
 528   ;; the calling function until searching is completed) by entering
 529   ;; a recursive-edit and exiting it when done isearching.
 530   (if recursive-edit
 531       (let ((isearch-recursive-edit t))
 532         (recursive-edit)))
 533   )
 534
 535
 536 ;;;====================================================
 537 ;; Some high level utilities.  Others below.
 538
 539 (defun isearch-update ()
 540   ;; Called after each command to update the display.
 541   (if (if isearch-event-data-type
 542           (null unread-command-event)
 543         (if isearch-gnu-emacs-events
 544             (null unread-command-events)
 545           (< unread-command-char 0)))
 546       (progn
 547         (if (not (input-pending-p))
 548             (isearch-message))
 549         (if (and isearch-slow-terminal-mode
 550                  (not (or isearch-small-window
 551                           (pos-visible-in-window-p))))
 552             (let ((found-point (point)))
 553               (setq isearch-small-window t)
 554               (move-to-window-line 0)
 555               (let ((window-min-height 1))
 556                 (split-window nil (if (< search-slow-window-lines 0)
 557                                       (1+ (- search-slow-window-lines))
 558                                     (- (window-height)
 559                                        (1+ search-slow-window-lines)))))
 560               (if (< search-slow-window-lines 0)
 561                   (progn (vertical-motion (- 1 search-slow-window-lines))
 562                          (set-window-start (next-window) (point))
 563                          (set-window-hscroll (next-window)
 564                                              (window-hscroll))
 565                          (set-window-hscroll (selected-window) 0))
 566                 (other-window 1))
 567               (goto-char found-point)))
 568         (if isearch-other-end
 569             (if (< isearch-other-end (point)) ; isearch-forward?
 570                 (isearch-highlight isearch-other-end (point))
 571               (isearch-highlight (point) isearch-other-end))
 572           (isearch-dehighlight nil))
 573         ))
 574   (setq ;; quit-flag nil  not for isearch-mode
 575    isearch-adjusted nil
 576    isearch-yank-flag nil)
 577   )
 578
 579
 580 (defun isearch-done (&optional nopush)
 581   ;; Called by all commands that terminate isearch-mode.
 582   ;; If NOPUSH is non-nil, we don't push the string on the search ring.
 583   (setq overriding-local-map nil)
 584   ;; (setq pre-command-hook isearch-old-pre-command-hook) ; for lemacs
 585   (isearch-dehighlight t)
 586   (let ((found-start (window-start (selected-window)))
 587         (found-point (point)))
 588     (if isearch-window-configuration
 589         (set-window-configuration isearch-window-configuration))
 590
 591     (if isearch-small-window
 592         (goto-char found-point)
 593       ;; Exiting the save-window-excursion clobbers window-start; restore it.
 594       (set-window-start (selected-window) found-start t)))
 595
 596     ;; If there was movement, mark the starting position.
 597     ;; Maybe should test difference between and set mark iff > threshold.
 598     (if (/= (point) isearch-opoint)
 599         (progn
 600           (push-mark isearch-opoint t)
 601           (deactivate-mark)
 602           (or executing-macro (> (minibuffer-depth) 0)
 603               (message "Mark saved where search started")))
 604       ;; (message "") why is this needed?
 605       )
 606
 607   (setq isearch-mode nil)
 608   (set-buffer-modified-p (buffer-modified-p))  ;; update modeline
 609
 610   (if (and (> (length isearch-string) 0) (not nopush))
 611       ;; Update the ring data.
 612       (if isearch-regexp
 613           (if (or (null regexp-search-ring)
 614                   (not (string= isearch-string (car regexp-search-ring))))
 615               (progn
 616                 (setq regexp-search-ring
 617                       (cons isearch-string regexp-search-ring))
 618                 (if (> (length regexp-search-ring) regexp-search-ring-max)
 619                     (setcdr (nthcdr (1- search-ring-max) regexp-search-ring)
 620                             nil))))
 621         (if (or (null search-ring)
 622                 (not (string= isearch-string (car search-ring))))
 623             (progn
 624               (setq search-ring (cons isearch-string search-ring))
 625               (if (> (length search-ring) search-ring-max)
 626                   (setcdr (nthcdr (1- search-ring-max) search-ring) nil))))))
 627
 628   (run-hooks 'isearch-mode-end-hook)
 629   (if isearch-recursive-edit (exit-recursive-edit)))
 630
 631 ;;;=======================================================
 632 ;;; Switching buffers should first terminate isearch-mode.
 633 ;;; This is done quite differently for each variant of emacs.
 634 ;;; For lemacs, see Exiting in lemacs below
 635
 636 ;; For Emacs 19, the frame switch event is handled.
 637 (defun isearch-switch-frame-handler ()
 638   (interactive) ;; Is this necessary?
 639   ;; First terminate isearch-mode.
 640   (isearch-done)
 641   (handle-switch-frame (car (cdr (isearch-last-command-char)))))
 642
 643 ;;;========================================================
 644
 645 \f
 646 ;;;====================================================
 647 ;; Commands active while inside of the isearch minor mode.
 648
 649 (defun isearch-exit ()
 650   "Exit search normally.
 651 However, if this is the first command after starting incremental
 652 search and `search-nonincremental-instead' is non-nil, do a
 653 nonincremental search instead via `isearch-edit-string'."
 654   (interactive)
 655   (if (and search-nonincremental-instead
 656            (= 0 (length isearch-string)))
 657       (let ((isearch-nonincremental t))
 658         (isearch-edit-string)))
 659   (isearch-done))
 660
 661
 662 (defun isearch-edit-string ()
 663   "Edit the search string in the minibuffer.
 664 The following additional command keys are active while editing.
 665 \\<minibuffer-local-isearch-map>
 666 \\[exit-minibuffer] to resume incremental searching with the edited string.
 667 \\[isearch-nonincremental-exit-minibuffer] to do one nonincremental search.
 668 \\[isearch-forward-exit-minibuffer] to resume isearching forward.
 669 \\[isearch-backward-exit-minibuffer] to resume isearching backward.
 670 \\[isearch-ring-advance-edit] to replace the search string with the next item in the search ring.
 671 \\[isearch-ring-retreat-edit] to replace the search string with the previous item in the search ring.
 672 \\[isearch-complete-edit] to complete the search string using the search ring.
 673
 674 If first char entered is \\[isearch-yank-word], then do word search instead."
 675
 676   ;; This code is very hairy for several reasons, explained in the code.
 677   ;; Mainly, isearch-mode must be terminated while editing and then restarted.
 678   ;; If there were a way to catch any change of buffer from the minibuffer,
 679   ;; this could be simplified greatly.
 680   ;; Editing doesn't back up the search point.  Should it?
 681   (interactive)
 682   (condition-case err
 683       (let ((isearch-nonincremental isearch-nonincremental)
 684
 685             ;; Locally bind all isearch global variables to protect them
 686             ;; from recursive isearching.
 687             ;; isearch-string -message and -forward are not bound
 688             ;; so they may be changed.  Instead, save the values.
 689             (isearch-new-string isearch-string)
 690             (isearch-new-message isearch-message)
 691             (isearch-new-forward isearch-forward)
 692             (isearch-new-word isearch-word)
 693
 694             (isearch-regexp isearch-regexp)
 695             (isearch-op-fun isearch-op-fun)
 696             (isearch-cmds isearch-cmds)
 697             (isearch-success isearch-success)
 698             (isearch-wrapped isearch-wrapped)
 699             (isearch-barrier isearch-barrier)
 700             (isearch-adjusted isearch-adjusted)
 701             (isearch-yank-flag isearch-yank-flag)
 702             (isearch-invalid-regexp isearch-invalid-regexp)
 703             (isearch-within-brackets isearch-within-brackets)
 704             (isearch-other-end isearch-other-end)
 705             (isearch-opoint isearch-opoint)
 706             (isearch-slow-terminal-mode isearch-slow-terminal-mode)
 707             (isearch-small-window isearch-small-window)
 708             (isearch-recursive-edit isearch-recursive-edit)
 709             ;; Save current configuration so we can restore it here.
 710             (isearch-window-configuration (current-window-configuration))
 711             )
 712
 713         ;; Actually terminate isearching until editing is done.
 714         ;; This is so that the user can do anything without failure,
 715         ;; like switch buffers and start another isearch, and return.
 716         (condition-case err
 717             (isearch-done t)
 718           (exit nil))                   ; was recursive editing
 719
 720         (isearch-message) ;; for read-char
 721         (unwind-protect
 722             (let* (;; Why does following read-char echo?
 723                    ;;(echo-keystrokes 0) ;; not needed with above message
 724                    (e (let ((cursor-in-echo-area t))
 725                         (read-event)))
 726                    ;; Binding minibuffer-history-symbol to nil is a work-around
 727                    ;; for some incompatibility with gmhist.
 728                    (minibuffer-history-symbol))
 729               ;; If the first character the user types when we prompt them
 730               ;; for a string is the yank-word character, then go into
 731               ;; word-search mode.  Otherwise unread that character and
 732               ;; read a key the normal way.
 733               ;; Word search does not apply (yet) to regexp searches,
 734               ;; no check is made here.
 735               (message (isearch-message-prefix nil nil t))
 736               (if (eq 'isearch-yank-word
 737                       (lookup-key isearch-mode-map (vector e)))
 738                   (setq isearch-word t  ;; so message-prefix is right
 739                         isearch-new-word t)
 740                 (isearch-unread e))
 741               (setq cursor-in-echo-area nil)
 742               (setq isearch-new-string
 743                     (let (junk-ring)
 744                       (read-from-minibuffer (isearch-message-prefix)
 745                                             isearch-string
 746                                             minibuffer-local-isearch-map nil
 747                                             'junk-ring))
 748                     isearch-new-message (mapconcat 'text-char-description
 749                                                    isearch-new-string "")))
 750           ;; Always resume isearching by restarting it.
 751           (isearch-mode isearch-forward
 752                         isearch-regexp
 753                         isearch-op-fun
 754                         isearch-recursive-edit
 755                         isearch-word)
 756
 757           ;; Copy new local values to isearch globals
 758           (setq isearch-string isearch-new-string
 759                 isearch-message isearch-new-message
 760                 isearch-forward isearch-new-forward
 761                 isearch-word isearch-new-word))
 762
 763         ;; Empty isearch-string means use default.
 764         (if (= 0 (length isearch-string))
 765             (setq isearch-string (car (if isearch-regexp regexp-search-ring
 766                                         search-ring)))
 767           ;; This used to set the last search string,
 768           ;; but I think it is not right to do that here.
 769           ;; Only the string actually used should be saved.
 770           )
 771
 772         ;; Reinvoke the pending search.
 773         (isearch-push-state)
 774         (isearch-search)
 775         (isearch-update)
 776         (if isearch-nonincremental
 777             (progn
 778               ;; (sit-for 1) ;; needed if isearch-done does: (message "")
 779               (isearch-done))))
 780
 781     (quit  ; handle abort-recursive-edit
 782      (isearch-abort)  ;; outside of let to restore outside global values
 783      )))
 784
 785 (defun isearch-nonincremental-exit-minibuffer ()
 786   (interactive)
 787   (setq isearch-nonincremental t)
 788   (exit-minibuffer))
 789
 790 (defun isearch-forward-exit-minibuffer ()
 791   (interactive)
 792   (setq isearch-new-forward t)
 793   (exit-minibuffer))
 794
 795 (defun isearch-reverse-exit-minibuffer ()
 796   (interactive)
 797   (setq isearch-new-forward nil)
 798   (exit-minibuffer))
 799
 800
 801 (defun isearch-abort ()
 802   "Abort incremental search mode if searching is successful, signalling quit.
 803 Otherwise, revert to previous successful search and continue searching.
 804 Use `isearch-exit' to quit without signalling."
 805   (interactive)
 806 ;;  (ding)  signal instead below, if quitting
 807   (discard-input)
 808   (if isearch-success
 809       ;; If search is successful, move back to starting point
 810       ;; and really do quit.
 811       (progn (goto-char isearch-opoint)
 812              (isearch-done t)   ; exit isearch
 813              (signal 'quit nil))  ; and pass on quit signal
 814     ;; If search is failing, rub out until it is once more successful.
 815     (while (not isearch-success) (isearch-pop-state))
 816     (isearch-update)))
 817
 818
 819 (defun isearch-repeat (direction)
 820   ;; Utility for isearch-repeat-forward and -backward.
 821   (if (eq isearch-forward (eq direction 'forward))
 822       ;; C-s in forward or C-r in reverse.
 823       (if (equal isearch-string "")
 824           ;; If search string is empty, use last one.
 825           (setq isearch-string
 826                 (or (if isearch-regexp
 827                         (car regexp-search-ring)
 828                       (car search-ring))
 829                     "")
 830                 isearch-message
 831                 (mapconcat 'isearch-text-char-description
 832                            isearch-string ""))
 833         ;; If already have what to search for, repeat it.
 834         (or isearch-success
 835             (progn
 836
 837               (goto-char (if isearch-forward (point-min) (point-max)))
 838               (setq isearch-wrapped t))))
 839     ;; C-s in reverse or C-r in forward, change direction.
 840     (setq isearch-forward (not isearch-forward)))
 841
 842   (setq isearch-barrier (point)) ; For subsequent \| if regexp.
 843
 844   (if (equal isearch-string "")
 845       (setq isearch-success t)
 846     (if (and isearch-success (equal (match-end 0) (match-beginning 0)))
 847         ;; If repeating a search that found
 848         ;; an empty string, ensure we advance.
 849         (if (if isearch-forward (eobp) (bobp))
 850             ;; If there's nowhere to advance to, fail (and wrap next time).
 851             (progn
 852               (setq isearch-success nil)
 853               (ding))
 854           (forward-char (if isearch-forward 1 -1))
 855           (isearch-search))
 856       (isearch-search)))
 857
 858   (isearch-push-state)
 859   (isearch-update))
 860
 861 (defun isearch-repeat-forward ()
 862   "Repeat incremental search forwards."
 863   (interactive)
 864   (isearch-repeat 'forward))
 865
 866 (defun isearch-repeat-backward ()
 867   "Repeat incremental search backwards."
 868   (interactive)
 869   (isearch-repeat 'backward))
 870
 871 (defun isearch-toggle-regexp ()
 872   "Toggle regexp searching on or off."
 873   ;; The status stack is left unchanged.
 874   (interactive)
 875   (setq isearch-regexp (not isearch-regexp))
 876   (if isearch-regexp (setq isearch-word nil))
 877   (isearch-update))
 878
 879 (defun isearch-delete-char ()
 880   "Discard last input item and move point back.
 881 If no previous match was done, just beep."
 882   (interactive)
 883   (if (null (cdr isearch-cmds))
 884       (ding)
 885     (isearch-pop-state))
 886   (isearch-update))
 887
 888
 889 (defun isearch-yank (chunk)
 890   ;; Helper for isearch-yank-word and isearch-yank-line
 891   ;; CHUNK should be word, line or kill.
 892   (let ((string (cond
 893                  ((eq chunk 'kill)
 894                   (current-kill 0))
 895                  (t
 896                   (save-excursion
 897                     (and (not isearch-forward) isearch-other-end
 898                          (goto-char isearch-other-end))
 899                     (buffer-substring
 900                      (point)
 901                      (save-excursion
 902                        (cond
 903                         ((eq chunk 'word)
 904                          (forward-word 1))
 905                         ((eq chunk 'line)
 906                          (end-of-line)))
 907                        (point))))))))
 908     ;; Downcase the string if not supposed to case-fold yanked strings.
 909     (if (and isearch-case-fold-search
 910              (eq 'not-yanks search-upper-case))
 911         (setq string (downcase string)))
 912     (if isearch-regexp (setq string (regexp-quote string)))
 913     (setq isearch-string (concat isearch-string string)
 914           isearch-message
 915           (concat isearch-message
 916                   (mapconcat 'isearch-text-char-description
 917                              string ""))
 918           ;; Don't move cursor in reverse search.
 919           isearch-yank-flag t))
 920   (isearch-search-and-update))
 921
 922 (defun isearch-yank-kill ()
 923   "Pull string from kill ring into search string."
 924   (interactive)
 925   (isearch-yank 'kill))
 926
 927 (defun isearch-yank-word ()
 928   "Pull next word from buffer into search string."
 929   (interactive)
 930   (isearch-yank 'word))
 931
 932 (defun isearch-yank-line ()
 933   "Pull rest of line from buffer into search string."
 934   (interactive)
 935   (isearch-yank 'line))
 936
 937
 938 (defun isearch-search-and-update ()
 939   ;; Do the search and update the display.
 940   (if (and (not isearch-success)
 941            ;; unsuccessful regexp search may become
 942            ;;  successful by addition of characters which
 943            ;;  make isearch-string valid
 944            (not isearch-regexp))
 945       nil
 946     ;; In reverse search, adding stuff at
 947     ;; the end may cause zero or many more chars to be
 948     ;; matched, in the string following point.
 949     ;; Allow all those possibilities without moving point as
 950     ;; long as the match does not extend past search origin.
 951     (if (and (not isearch-forward) (not isearch-adjusted)
 952              (condition-case ()
 953                  (looking-at (if isearch-regexp isearch-string
 954                                (regexp-quote isearch-string)))
 955                (error nil))
 956                (or isearch-yank-flag
 957                    (<= (match-end 0)
 958                        (min isearch-opoint isearch-barrier))))
 959         (setq isearch-success t
 960               isearch-invalid-regexp nil
 961               isearch-within-brackets nil
 962               isearch-other-end (match-end 0))
 963       ;; Not regexp, not reverse, or no match at point.
 964       (if (and isearch-other-end (not isearch-adjusted))
 965           (goto-char (if isearch-forward isearch-other-end
 966                        (min isearch-opoint
 967                             isearch-barrier
 968                             (1+ isearch-other-end)))))
 969       (isearch-search)
 970       ))
 971   (isearch-push-state)
 972   (if isearch-op-fun (funcall isearch-op-fun))
 973   (isearch-update))
 974
 975
 976 ;; *, ?, and | chars can make a regexp more liberal.
 977 ;; They can make a regexp match sooner or make it succeed instead of failing.
 978 ;; So go back to place last successful search started
 979 ;; or to the last ^S/^R (barrier), whichever is nearer.
 980 ;; + needs no special handling because the string must match at least once.
 981
 982 (defun isearch-*-char ()
 983   "Handle * and ? specially in regexps."
 984   (interactive)
 985   (if isearch-regexp
 986
 987       (progn
 988         (setq isearch-adjusted t)
 989         (let ((cs (nth (if isearch-forward
 990                            5            ; isearch-other-end
 991                          2)             ; saved (point)
 992                        (car (cdr isearch-cmds)))))
 993           ;; (car isearch-cmds) is after last search;
 994           ;; (car (cdr isearch-cmds)) is from before it.
 995           (setq cs (or cs isearch-barrier))
 996           (goto-char
 997            (if isearch-forward
 998                (max cs isearch-barrier)
 999              (min cs isearch-barrier))))))
1000   (isearch-process-search-char (isearch-last-command-char)))
1001
1002
1003 (defun isearch-|-char ()
1004   "If in regexp search, jump to the barrier."
1005   (interactive)
1006   (if isearch-regexp
1007       (progn
1008         (setq isearch-adjusted t)
1009         (goto-char isearch-barrier)))
1010   (isearch-process-search-char (isearch-last-command-char)))
1011
1012
1013 (defalias 'isearch-other-control-char 'isearch-other-meta-char)
1014
1015 (defun isearch-other-meta-char ()
1016   "Exit the search normally and reread this key sequence.
1017 But only if `search-exit-option' is non-nil, the default.
1018 If it is the symbol `edit', the search string is edited in the minibuffer
1019 and the meta character is unread so that it applies to editing the string."
1020   (interactive)
1021   (cond ((eq search-exit-option 'edit)
1022          (let ((key (this-command-keys)))
1023            (apply 'isearch-unread (listify-key-sequence key)))
1024          (isearch-edit-string))
1025         (search-exit-option
1026          (let ((key (this-command-keys))
1027                (index 0)
1028                window)
1029            (apply 'isearch-unread (listify-key-sequence key))
1030            ;; Properly handle scroll-bar and mode-line clicks
1031            ;; for which a dummy prefix event was generated as (aref key 0).
1032            (and (> (length key) 1)
1033                 (symbolp (aref key 0))
1034                 (listp (aref key 1))
1035                 ;; These events now have a symbol; they used to have a list.
1036                 ;; Accept either one.  Other events have a number here.
1037                 (not (numberp (posn-point (event-start (aref key 1)))))
1038                 (setq index 1))
1039            ;; If we got a mouse click, maybe it was read with the buffer
1040            ;; it was clicked on.  If so, that buffer, not the current one,
1041            ;; is in isearch mode.  So end the search in that buffer.
1042            (if (and (listp (aref key index))
1043                     (setq window (posn-window (event-start (aref key index))))
1044                     (windowp window))
1045                (save-excursion
1046                  (set-buffer (window-buffer window))
1047                  (isearch-done))
1048              (isearch-done))))
1049         (t;; otherwise nil
1050          (isearch-process-search-string (this-command-keys)
1051                                         (this-command-keys)))))
1052
1053 (defun isearch-quote-char ()
1054   "Quote special characters for incremental search."
1055   (interactive)
1056   (isearch-process-search-char (read-quoted-char (isearch-message t))))
1057
1058 (defun isearch-return-char ()
1059   "Convert return into newline for incremental search.
1060 Obsolete."
1061   (interactive)
1062   (isearch-process-search-char ?\n))
1063
1064 (defun isearch-printing-char ()
1065   "Add this ordinary printing character to the search string and search."
1066   (interactive)
1067   (isearch-process-search-char (isearch-last-command-char)))
1068
1069 (defun isearch-whitespace-chars ()
1070   "Match all whitespace chars, if in regexp mode.
1071 If you want to search for just a space, type C-q SPC."
1072   (interactive)
1073   (if isearch-regexp
1074       (if (and search-whitespace-regexp (not isearch-within-brackets))
1075           (isearch-process-search-string search-whitespace-regexp " ")
1076         (isearch-printing-char))
1077     (progn
1078       ;; This way of doing word search doesn't correctly extend current search.
1079       ;;      (setq isearch-word t)
1080       ;;      (setq isearch-adjusted t)
1081       ;;      (goto-char isearch-barrier)
1082       (isearch-printing-char))))
1083
1084 (defun isearch-process-search-char (char)
1085   ;; Append the char to the search string, update the message and re-search.
1086   (isearch-process-search-string
1087    (isearch-char-to-string char)
1088    (isearch-text-char-description char)))
1089
1090 (defun isearch-process-search-string (string message)
1091   (setq isearch-string (concat isearch-string string)
1092         isearch-message (concat isearch-message message))
1093   (isearch-search-and-update))
1094
1095 \f
1096 ;;===========================================================
1097 ;; Search Ring
1098
1099 (defun isearch-ring-adjust1 (advance)
1100   ;; Helper for isearch-ring-adjust
1101   (let* ((ring (if isearch-regexp regexp-search-ring search-ring))
1102          (length (length ring))
1103          (yank-pointer-name (if isearch-regexp
1104                                 'regexp-search-ring-yank-pointer
1105                               'search-ring-yank-pointer))
1106          (yank-pointer (eval yank-pointer-name)))
1107     (if (zerop length)
1108         ()
1109       (set yank-pointer-name
1110            (setq yank-pointer
1111                  (mod (+ (or yank-pointer 0)
1112                          (if advance -1 1))
1113                       length)))
1114       (setq isearch-string (nth yank-pointer ring)
1115             isearch-message (mapconcat 'isearch-text-char-description
1116                                        isearch-string "")))))
1117
1118 (defun isearch-ring-adjust (advance)
1119   ;; Helper for isearch-ring-advance and isearch-ring-retreat
1120   (if (cdr isearch-cmds)  ;; is there more than one thing on stack?
1121       (isearch-pop-state))
1122   (isearch-ring-adjust1 advance)
1123   (isearch-push-state)
1124   (if search-ring-update
1125       (progn
1126         (isearch-search)
1127         (isearch-update))
1128     (isearch-edit-string)
1129     ))
1130
1131 (defun isearch-ring-advance ()
1132   "Advance to the next search string in the ring."
1133   ;; This could be more general to handle a prefix arg, but who would use it.
1134   (interactive)
1135   (isearch-ring-adjust 'advance))
1136
1137 (defun isearch-ring-retreat ()
1138   "Retreat to the previous search string in the ring."
1139   (interactive)
1140   (isearch-ring-adjust nil))
1141
1142 (defun isearch-ring-advance-edit (n)
1143   "Insert the next element of the search history into the minibuffer."
1144   (interactive "p")
1145   (let* ((yank-pointer-name (if isearch-regexp
1146                                 'regexp-search-ring-yank-pointer
1147                               'search-ring-yank-pointer))
1148          (yank-pointer (eval yank-pointer-name))
1149          (ring (if isearch-regexp regexp-search-ring search-ring))
1150          (length (length ring)))
1151     (if (zerop length)
1152         ()
1153       (set yank-pointer-name
1154            (setq yank-pointer
1155                  (mod (- (or yank-pointer 0) n)
1156                       length)))
1157
1158       (erase-buffer)
1159       (insert (nth yank-pointer ring))
1160       (goto-char (point-max)))))
1161
1162 (defun isearch-ring-retreat-edit (n)
1163   "Inserts the previous element of the search history into the minibuffer."
1164   (interactive "p")
1165   (isearch-ring-advance-edit (- n)))
1166
1167 ;;(defun isearch-ring-adjust-edit (advance)
1168 ;;  "Use the next or previous search string in the ring while in minibuffer."
1169 ;;  (isearch-ring-adjust1 advance)
1170 ;;  (erase-buffer)
1171 ;;  (insert isearch-string))
1172
1173 ;;(defun isearch-ring-advance-edit ()
1174 ;;  (interactive)
1175 ;;  (isearch-ring-adjust-edit 'advance))
1176
1177 ;;(defun isearch-ring-retreat-edit ()
1178 ;;  "Retreat to the previous search string in the ring while in the minibuffer."
1179 ;;  (interactive)
1180 ;;  (isearch-ring-adjust-edit nil))
1181
1182
1183 (defun isearch-complete1 ()
1184   ;; Helper for isearch-complete and isearch-complete-edit
1185   ;; Return t if completion OK, nil if no completion exists.
1186   (let* ((ring (if isearch-regexp regexp-search-ring search-ring))
1187          (alist (mapcar (function (lambda (string) (list string))) ring))
1188          (completion-ignore-case case-fold-search)
1189          (completion (try-completion isearch-string alist)))
1190     (cond
1191      ((eq completion t)
1192       ;; isearch-string stays the same
1193       t)
1194      ((or completion ; not nil, must be a string
1195           (= 0 (length isearch-string))) ; shouldnt have to say this
1196       (if (equal completion isearch-string)  ;; no extension?
1197           (if completion-auto-help
1198               (with-output-to-temp-buffer "*Isearch completions*"
1199                 (display-completion-list
1200                  (all-completions isearch-string alist))))
1201         (setq isearch-string completion))
1202       t)
1203      (t
1204       (message "No completion") ; waits a second if in minibuffer
1205       nil))))
1206
1207 (defun isearch-complete ()
1208   "Complete the search string from the strings on the search ring.
1209 The completed string is then editable in the minibuffer.
1210 If there is no completion possible, say so and continue searching."
1211   (interactive)
1212   (if (isearch-complete1)
1213       (isearch-edit-string)
1214     ;; else
1215     (sit-for 1)
1216     (isearch-update)))
1217
1218 (defun isearch-complete-edit ()
1219   "Same as `isearch-complete' except in the minibuffer."
1220   (interactive)
1221   (setq isearch-string (buffer-string))
1222   (if (isearch-complete1)
1223       (progn
1224         (erase-buffer)
1225         (insert isearch-string))))
1226
1227 \f
1228 ;;;==============================================================
1229 ;; The search status stack (and isearch window-local variables, not used).
1230 ;; Need a structure for this.
1231
1232 (defun isearch-top-state ()
1233   (let ((cmd (car isearch-cmds)))
1234     (setq isearch-string (car cmd)
1235           isearch-message (car (cdr cmd))
1236           isearch-success (nth 3 cmd)
1237           isearch-forward (nth 4 cmd)
1238           isearch-other-end (nth 5 cmd)
1239           isearch-word (nth 6 cmd)
1240           isearch-invalid-regexp (nth 7 cmd)
1241           isearch-wrapped (nth 8 cmd)
1242           isearch-barrier (nth 9 cmd)
1243           isearch-within-brackets (nth 10 cmd)
1244           isearch-case-fold-search (nth 11 cmd))
1245     (goto-char (car (cdr (cdr cmd))))))
1246
1247 (defun isearch-pop-state ()
1248   (setq isearch-cmds (cdr isearch-cmds))
1249   (isearch-top-state)
1250   )
1251
1252 (defun isearch-push-state ()
1253   (setq isearch-cmds
1254         (cons (list isearch-string isearch-message (point)
1255                     isearch-success isearch-forward isearch-other-end
1256                     isearch-word
1257                     isearch-invalid-regexp isearch-wrapped isearch-barrier
1258                     isearch-within-brackets isearch-case-fold-search)
1259               isearch-cmds)))
1260
1261 \f
1262 ;;;==================================================================
1263 ;; Message string
1264
1265 (defun isearch-message (&optional c-q-hack ellipsis)
1266   ;; Generate and print the message string.
1267   (let ((cursor-in-echo-area ellipsis)
1268         (m (concat
1269             (isearch-message-prefix c-q-hack ellipsis isearch-nonincremental)
1270             isearch-message
1271             (isearch-message-suffix c-q-hack ellipsis)
1272             )))
1273     (if c-q-hack m (message "%s" m))))
1274
1275 (defun isearch-message-prefix (&optional c-q-hack ellipsis nonincremental)
1276   ;; If about to search, and previous search regexp was invalid,
1277   ;; check that it still is.  If it is valid now,
1278   ;; let the message we display while searching say that it is valid.
1279   (and isearch-invalid-regexp ellipsis
1280        (condition-case ()
1281            (progn (re-search-forward isearch-string (point) t)
1282                   (setq isearch-invalid-regexp nil))
1283          (error nil)))
1284   ;; If currently failing, display no ellipsis.
1285   (or isearch-success (setq ellipsis nil))
1286   (let ((m (concat (if isearch-success "" "failing ")
1287                    (if isearch-wrapped "wrapped ")
1288                    (if isearch-word "word " "")
1289                    (if isearch-regexp "regexp " "")
1290                    (if nonincremental "search" "I-search")
1291                    (if isearch-forward ": " " backward: ")
1292                    )))
1293     (aset m 0 (upcase (aref m 0)))
1294     m))
1295
1296
1297 (defun isearch-message-suffix (&optional c-q-hack ellipsis)
1298   (concat (if c-q-hack "^Q" "")
1299           (if isearch-invalid-regexp
1300               (concat " [" isearch-invalid-regexp "]")
1301             "")))
1302
1303 \f
1304 ;;;========================================================
1305 ;;; Searching
1306
1307 (defun isearch-search ()
1308   ;; Do the search with the current search string.
1309   (isearch-message nil t)
1310   (if (and isearch-case-fold-search search-upper-case)
1311       (setq isearch-case-fold-search
1312             (isearch-no-upper-case-p isearch-string isearch-regexp)))
1313   (condition-case lossage
1314       (let ((inhibit-quit nil)
1315             (case-fold-search isearch-case-fold-search))
1316         (if isearch-regexp (setq isearch-invalid-regexp nil))
1317         (setq isearch-within-brackets nil)
1318         (setq isearch-success
1319               (funcall
1320                (cond (isearch-word
1321                       (if isearch-forward
1322                           'word-search-forward 'word-search-backward))
1323                      (isearch-regexp
1324                       (if isearch-forward
1325                           're-search-forward 're-search-backward))
1326                      (t
1327                       (if isearch-forward 'search-forward 'search-backward)))
1328                isearch-string nil t))
1329         (if isearch-success
1330             (setq isearch-other-end
1331                   (if isearch-forward (match-beginning 0) (match-end 0)))))
1332
1333     (quit (isearch-unread ?\C-g)
1334           (setq isearch-success nil))
1335
1336     (invalid-regexp
1337      (setq isearch-invalid-regexp (car (cdr lossage)))
1338      (setq isearch-within-brackets (string-match "\\`Unmatched \\["
1339                                                  isearch-invalid-regexp))
1340      (if (string-match
1341           "\\`Premature \\|\\`Unmatched \\|\\`Invalid "
1342           isearch-invalid-regexp)
1343          (setq isearch-invalid-regexp "incomplete input")))
1344     (error
1345      ;; stack overflow in regexp search.
1346      (setq isearch-invalid-regexp (car (cdr lossage)))))
1347
1348   (if isearch-success
1349       nil
1350     ;; Ding if failed this time after succeeding last time.
1351     (and (nth 3 (car isearch-cmds))
1352          (ding))
1353     (goto-char (nth 2 (car isearch-cmds)))))
1354
1355
1356 \f
1357 ;;;========================================================
1358 ;;; Highlighting
1359
1360 (defvar isearch-overlay nil)
1361
1362 (defun isearch-highlight (beg end)
1363   (if (or (null search-highlight) (null window-system))
1364       nil
1365     (or isearch-overlay (setq isearch-overlay (make-overlay beg end)))
1366     (move-overlay isearch-overlay beg end (current-buffer))
1367     (overlay-put isearch-overlay 'face
1368                  (if (internal-find-face 'isearch nil)
1369                      'isearch 'region))))
1370
1371 (defun isearch-dehighlight (totally)
1372   (if isearch-overlay
1373       (delete-overlay isearch-overlay)))
1374
1375 ;;;===========================================================
1376 ;;; General utilities
1377
1378
1379 (defun isearch-no-upper-case-p (string regexp-flag)
1380   "Return t if there are no upper case chars in STRING.
1381 If REGEXP-FLAG is non-nil, disregard letters preceeded by `\\' (but not `\\\\')
1382 since they have special meaning in a regexp."
1383   (let ((case-fold-search nil))
1384     (not (string-match (if regexp-flag "\\(^\\|\\\\\\\\\\|[^\\]\\)[A-Z]"
1385                          "[A-Z]")
1386                        string))))
1387
1388
1389 ;;;=================================================
1390 ;; Portability functions to support various Emacs versions.
1391
1392 ;; To quiet the byte-compiler.
1393 (defvar unread-command-event)
1394 (defvar unread-command-events)
1395 (defvar last-command-event)
1396
1397 (defun isearch-char-to-string (c)
1398   (if (integerp c)
1399       (make-string 1 c)
1400     (if (and (symbolp c) (get c 'ascii-character))
1401         (make-string 1 (get c 'ascii-character))
1402       (make-string 1 (event-to-character c)))))
1403
1404 (defun isearch-text-char-description (c)
1405   (if (and (integerp c) (or (< c ?\ ) (= c ?\^?)))
1406       (text-char-description c)
1407     (isearch-char-to-string c)))
1408
1409 (defun isearch-unread (&rest char-or-events)
1410   ;; General function to unread characters or events.
1411   (if isearch-gnu-emacs-events
1412       (setq unread-command-events
1413             (append char-or-events unread-command-events))
1414     (let ((char (if (cdr char-or-events)
1415                     (progn
1416                       (while (cdr char-or-events)
1417                         (setq char-or-events (cdr char-or-events)))
1418                       (+ 128 (car char-or-events)))
1419                   (car char-or-events))))
1420       (if isearch-event-data-type
1421           (setq unread-command-event char)
1422         (setq unread-command-char char)))))
1423
1424 (defun isearch-last-command-char ()
1425   ;; General function to return the last command character.
1426   (if isearch-event-data-type
1427       last-command-event
1428     last-command-char))
1429
1430 ;;; isearch.el ends here