lisp/play/zone.el

   1 ;;; zone.el --- idle display hacks
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   4 ;;   2009, 2010, 2011  Free Software Foundation, Inc.
   5
   6 ;; Author: Victor Zandy <zandy@cs.wisc.edu>
   7 ;; Maintainer: Thien-Thi Nguyen <ttn@gnu.org>
   8 ;; Keywords: games
   9 ;; Created: June 6, 1998
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; Don't zone out in front of Emacs!  Try M-x zone.
  29 ;; If it eventually irritates you, try M-x zone-leave-me-alone.
  30
  31 ;; Bored by the zone pyrotechnics?  Write your own!  Add it to
  32 ;; `zone-programs'.  See `zone-call' for higher-ordered zoning.
  33
  34 ;; WARNING: Not appropriate for Emacs sessions over modems or
  35 ;;          computers as slow as mine.
  36
  37 ;; THANKS: Christopher Mayer, Scott Flinchbaugh,
  38 ;;         Rachel Kalmar, Max Froumentin, Juri Linkov,
  39 ;;         Luigi Panzeri, John Paul Wallington.
  40
  41 ;;; Code:
  42
  43 (defvar zone-timer nil
  44   "The timer we use to decide when to zone out, or nil if none.")
  45
  46 (defvar zone-timeout nil
  47   "*Seconds to timeout the zoning.
  48 If nil, don't interrupt for about 1^26 seconds.")
  49
  50 ;; Vector of functions that zone out.  `zone' will execute one of
  51 ;; these functions, randomly chosen.  The chosen function is invoked
  52 ;; in the *zone* buffer, which contains the text of the selected
  53 ;; window.  If the function loops, it *must* periodically check and
  54 ;; halt if `input-pending-p' is t (because quitting is disabled when
  55 ;; Emacs idle timers are run).
  56 (defvar zone-programs [
  57                        zone-pgm-jitter
  58                        zone-pgm-putz-with-case
  59                        zone-pgm-dissolve
  60                        ;; zone-pgm-explode
  61                        zone-pgm-whack-chars
  62                        zone-pgm-rotate
  63                        zone-pgm-rotate-LR-lockstep
  64                        zone-pgm-rotate-RL-lockstep
  65                        zone-pgm-rotate-LR-variable
  66                        zone-pgm-rotate-RL-variable
  67                        zone-pgm-drip
  68                        zone-pgm-drip-fretfully
  69                        zone-pgm-five-oclock-swan-dive
  70                        zone-pgm-martini-swan-dive
  71                        zone-pgm-rat-race
  72                        zone-pgm-paragraph-spaz
  73                        zone-pgm-stress
  74                        zone-pgm-stress-destress
  75                        zone-pgm-random-life
  76                        ])
  77
  78 (defmacro zone-orig (&rest body)
  79   `(with-current-buffer (get 'zone 'orig-buffer)
  80      ,@body))
  81
  82 (defmacro zone-hiding-modeline (&rest body)
  83   ;; This formerly worked by temporarily altering face `mode-line',
  84   ;; which did not even work right, it seems.
  85   `(let (mode-line-format)
  86      ,@body))
  87
  88 (defun zone-call (program &optional timeout)
  89   "Call PROGRAM in a zoned way.
  90 If PROGRAM is a function, call it, interrupting after the amount
  91  of time in seconds specified by optional arg TIMEOUT, or `zone-timeout'
  92  if unspecified, q.v.
  93 PROGRAM can also be a list of elements, which are interpreted like so:
  94 If the element is a function or a list of a function and a number,
  95  apply `zone-call' recursively."
  96   (cond ((functionp program)
  97          (with-timeout ((or timeout zone-timeout (ash 1 26)))
  98            (funcall program)))
  99         ((listp program)
 100          (mapcar (lambda (elem)
 101                    (cond ((functionp elem) (zone-call elem))
 102                          ((and (listp elem)
 103                                (functionp (car elem))
 104                                (numberp (cadr elem)))
 105                           (apply 'zone-call elem))
 106                          (t (error "bad `zone-call' elem: %S" elem))))
 107                  program))))
 108
 109 ;;;###autoload
 110 (defun zone ()
 111   "Zone out, completely."
 112   (interactive)
 113   (save-window-excursion
 114     (let ((f (selected-frame))
 115           (outbuf (get-buffer-create "*zone*"))
 116           (text (buffer-substring (window-start) (window-end)))
 117           (wp (1+ (- (window-point (selected-window))
 118                      (window-start)))))
 119       (put 'zone 'orig-buffer (current-buffer))
 120       (put 'zone 'modeline-hidden-level 0)
 121       (switch-to-buffer outbuf)
 122       (setq mode-name "Zone")
 123       (erase-buffer)
 124       (setq buffer-undo-list t
 125             truncate-lines t
 126             tab-width (zone-orig tab-width)
 127             line-spacing (zone-orig line-spacing))
 128       (insert text)
 129       (untabify (point-min) (point-max))
 130       (set-window-start (selected-window) (point-min))
 131       (set-window-point (selected-window) wp)
 132       (sit-for 0 500)
 133       (let ((pgm (elt zone-programs (random (length zone-programs))))
 134             (ct (and f (frame-parameter f 'cursor-type)))
 135             (show-trailing-whitespace nil)
 136             (restore (list '(kill-buffer outbuf))))
 137         (when ct
 138           (modify-frame-parameters f '((cursor-type . (bar . 0))))
 139           (setq restore (cons '(modify-frame-parameters
 140                                 f (list (cons 'cursor-type ct)))
 141                               restore)))
 142         ;; Make `restore' a self-disabling one-shot thunk.
 143         (setq restore `(lambda () ,@restore (setq restore nil)))
 144         (condition-case nil
 145             (progn
 146               (message "Zoning... (%s)" pgm)
 147               (garbage-collect)
 148               ;; If some input is pending, zone says "sorry", which
 149               ;; isn't nice; this might happen e.g. when they invoke the
 150               ;; game by clicking the menu bar.  So discard any pending
 151               ;; input before zoning out.
 152               (if (input-pending-p)
 153                   (discard-input))
 154               (zone-call pgm)
 155               (message "Zoning...sorry"))
 156           (error
 157            (funcall restore)
 158            (while (not (input-pending-p))
 159              (message "We were zoning when we wrote %s..." pgm)
 160              (sit-for 3)
 161              (message "...here's hoping we didn't hose your buffer!")
 162              (sit-for 3)))
 163           (quit
 164            (funcall restore)
 165            (ding)
 166            (message "Zoning...sorry")))
 167         (when restore (funcall restore))))))
 168
 169 ;;;; Zone when idle, or not.
 170
 171 (defun zone-when-idle (secs)
 172   "Zone out when Emacs has been idle for SECS seconds."
 173   (interactive "nHow long before I start zoning (seconds): ")
 174   (if (timerp zone-timer)
 175       (cancel-timer zone-timer))
 176   (setq zone-timer nil)
 177   (or (<= secs 0)
 178       (setq zone-timer (run-with-idle-timer secs t 'zone))))
 179
 180 (defun zone-leave-me-alone ()
 181   "Don't zone out when Emacs is idle."
 182   (interactive)
 183   (if (timerp zone-timer)
 184       (cancel-timer zone-timer))
 185   (setq zone-timer nil)
 186   (message "I won't zone out any more"))
 187
 188
 189 ;;;; jittering
 190
 191 (defun zone-shift-up ()
 192   (let* ((b (point))
 193          (e (progn (forward-line 1) (point)))
 194          (s (buffer-substring b e)))
 195     (delete-region b e)
 196     (goto-char (point-max))
 197     (insert s)))
 198
 199 (defun zone-shift-down ()
 200   (goto-char (point-max))
 201   (let* ((b (point))
 202          (e (progn (forward-line -1) (point)))
 203          (s (buffer-substring b e)))
 204     (delete-region b e)
 205     (goto-char (point-min))
 206     (insert s)))
 207
 208 (defun zone-shift-left ()
 209   (let ((inhibit-point-motion-hooks t)
 210         s)
 211     (while (not (eobp))
 212       (unless (eolp)
 213         (setq s (buffer-substring (point) (1+ (point))))
 214         (delete-char 1)
 215         (end-of-line)
 216         (insert s))
 217       (ignore-errors (forward-char 1)))))
 218
 219 (defun zone-shift-right ()
 220   (goto-char (point-max))
 221   (let ((inhibit-point-motion-hooks t)
 222         s)
 223     (while (not (bobp))
 224       (unless (bolp)
 225         (setq s (buffer-substring (1- (point)) (point)))
 226         (delete-char -1)
 227         (beginning-of-line)
 228         (insert s))
 229       (end-of-line 0))))
 230
 231 (defun zone-pgm-jitter ()
 232   (let ((ops [
 233               zone-shift-left
 234               zone-shift-right
 235               zone-shift-down
 236               zone-shift-up
 237               ]))
 238     (goto-char (point-min))
 239     (while (not (input-pending-p))
 240       (funcall (elt ops (random (length ops))))
 241       (goto-char (point-min))
 242       (sit-for 0 10))))
 243
 244
 245 ;;;; whacking chars
 246
 247 (defun zone-pgm-whack-chars ()
 248   (let ((tbl (copy-sequence (get 'zone-pgm-whack-chars 'wc-tbl))))
 249     (while (not (input-pending-p))
 250       (let ((i 48))
 251         (while (< i 122)
 252           (aset tbl i (+ 48 (random (- 123 48))))
 253           (setq i (1+ i)))
 254         (translate-region (point-min) (point-max) tbl)
 255         (sit-for 0 2)))))
 256
 257 (put 'zone-pgm-whack-chars 'wc-tbl
 258      (let ((tbl (make-string 128 ?x))
 259            (i 0))
 260        (while (< i 128)
 261          (aset tbl i i)
 262          (setq i (1+ i)))
 263        tbl))
 264
 265 ;;;; dissolving
 266
 267 (defun zone-remove-text ()
 268   (let ((working t))
 269     (while working
 270       (setq working nil)
 271       (save-excursion
 272         (goto-char (point-min))
 273         (while (not (eobp))
 274           (if (looking-at "[^(){}\n\t ]")
 275               (let ((n (random 5)))
 276                 (if (not (= n 0))
 277                     (progn
 278                       (setq working t)
 279                       (forward-char 1))
 280                   (delete-char 1)
 281                   (insert " ")))
 282             (forward-char 1))))
 283       (sit-for 0 2))))
 284
 285 (defun zone-pgm-dissolve ()
 286   (zone-remove-text)
 287   (zone-pgm-jitter))
 288
 289
 290 ;;;; exploding
 291
 292 (defun zone-exploding-remove ()
 293   (let ((i 0))
 294     (while (< i 5)
 295       (save-excursion
 296         (goto-char (point-min))
 297         (while (not (eobp))
 298           (if (looking-at "[^*\n\t ]")
 299               (let ((n (random 5)))
 300                 (if (not (= n 0))
 301                     (forward-char 1))
 302                 (insert " ")))
 303           (forward-char 1)))
 304       (setq i (1+ i))
 305       (sit-for 0 2)))
 306   (zone-pgm-jitter))
 307
 308 (defun zone-pgm-explode ()
 309   (zone-exploding-remove)
 310   (zone-pgm-jitter))
 311
 312
 313 ;;;; putzing w/ case
 314
 315 ;; Faster than `zone-pgm-putz-with-case', but not as good: all
 316 ;; instances of the same letter have the same case, which produces a
 317 ;; less interesting effect than you might imagine.
 318 (defun zone-pgm-2nd-putz-with-case ()
 319   (let ((tbl (make-string 128 ?x))
 320         (i 0))
 321     (while (< i 128)
 322       (aset tbl i i)
 323       (setq i (1+ i)))
 324     (while (not (input-pending-p))
 325       (setq i ?a)
 326       (while (<= i ?z)
 327         (aset tbl i
 328               (if (zerop (random 5))
 329                   (upcase i)
 330                 (downcase i)))
 331         (setq i (+ i (1+ (random 5)))))
 332       (setq i ?A)
 333       (while (<= i ?z)
 334         (aset tbl i
 335               (if (zerop (random 5))
 336                   (downcase i)
 337                 (upcase i)))
 338         (setq i (+ i (1+ (random 5)))))
 339       (translate-region (point-min) (point-max) tbl)
 340       (sit-for 0 2))))
 341
 342 (defun zone-pgm-putz-with-case ()
 343   (goto-char (point-min))
 344   (while (not (input-pending-p))
 345     (let ((np (+ 2 (random 5)))
 346           (pm (point-max)))
 347       (while (< np pm)
 348         (funcall (if (zerop (random 2)) 'upcase-region
 349                    'downcase-region) (1- np) np)
 350         (setq np (+ np (1+ (random 5))))))
 351     (goto-char (point-min))
 352     (sit-for 0 2)))
 353
 354
 355 ;;;; rotating
 356
 357 (defun zone-line-specs ()
 358   (let ((ok t)
 359         ret)
 360     (save-excursion
 361       (goto-char (window-start))
 362       (while (and ok (< (point) (window-end)))
 363         (when (looking-at "[\t ]*\\([^\n]+\\)")
 364           (setq ret (cons (cons (match-beginning 1) (match-end 1)) ret)))
 365         (setq ok (zerop (forward-line 1)))))
 366     ret))
 367
 368 (defun zone-pgm-rotate (&optional random-style)
 369   (let* ((specs (apply
 370                  'vector
 371                  (let (res)
 372                    (mapc (lambda (ent)
 373                            (let* ((beg (car ent))
 374                                   (end (cdr ent))
 375                                   (amt (if random-style
 376                                            (funcall random-style)
 377                                          (- (random 7) 3))))
 378                              (when (< (- end (abs amt)) beg)
 379                                (setq amt (random (- end beg))))
 380                              (unless (= 0 amt)
 381                                (setq res
 382                                      (cons
 383                                       (vector amt beg (- end (abs amt)))
 384                                       res)))))
 385                          (zone-line-specs))
 386                    res)))
 387          (n (length specs))
 388          amt aamt cut paste txt i ent)
 389     (while (not (input-pending-p))
 390       (setq i 0)
 391       (while (< i n)
 392         (setq ent (aref specs i))
 393         (setq amt (aref ent 0) aamt (abs amt))
 394         (if (> 0 amt)
 395             (setq cut 1 paste 2)
 396           (setq cut 2 paste 1))
 397         (goto-char (aref ent cut))
 398         (setq aamt (min aamt (- (point-max) (point))))
 399         (setq txt (buffer-substring (point) (+ (point) aamt)))
 400         (delete-char aamt)
 401         (goto-char (aref ent paste))
 402         (insert txt)
 403         (setq i (1+ i)))
 404       (sit-for 0.04))))
 405
 406 (defun zone-pgm-rotate-LR-lockstep ()
 407   (zone-pgm-rotate (lambda () 1)))
 408
 409 (defun zone-pgm-rotate-RL-lockstep ()
 410   (zone-pgm-rotate (lambda () -1)))
 411
 412 (defun zone-pgm-rotate-LR-variable ()
 413   (zone-pgm-rotate (lambda () (1+ (random 3)))))
 414
 415 (defun zone-pgm-rotate-RL-variable ()
 416   (zone-pgm-rotate (lambda () (1- (- (random 3))))))
 417
 418
 419 ;;;; dripping
 420
 421 (defsubst zone-cpos (pos)
 422   (buffer-substring pos (1+ pos)))
 423
 424 (defsubst zone-replace-char (count del-count char-as-string new-value)
 425   (delete-char (or del-count (- count)))
 426   (aset char-as-string 0 new-value)
 427   (dotimes (i count) (insert char-as-string)))
 428
 429 (defsubst zone-park/sit-for (pos seconds)
 430   (let ((p (point)))
 431     (goto-char pos)
 432     (prog1 (sit-for seconds)
 433       (goto-char p))))
 434
 435 (defun zone-fret (wbeg pos)
 436   (let* ((case-fold-search nil)
 437          (c-string (zone-cpos pos))
 438          (cw-ceil (ceiling (char-width (aref c-string 0))))
 439          (hmm (cond
 440                ((string-match "[a-z]" c-string) (upcase c-string))
 441                ((string-match "[A-Z]" c-string) (downcase c-string))
 442                (t (propertize " " 'display `(space :width ,cw-ceil)))))
 443          (wait 0.5))
 444     (dotimes (i 20)
 445       (goto-char pos)
 446       (delete-char 1)
 447       (insert (if (= 0 (% i 2)) hmm c-string))
 448       (zone-park/sit-for wbeg (setq wait (* wait 0.8))))
 449     (delete-char -1) (insert c-string)))
 450
 451 (defun zone-fill-out-screen (width height)
 452   (let ((start (window-start))
 453         (line (make-string width 32))
 454         (inhibit-point-motion-hooks t))
 455     (goto-char start)
 456     ;; fill out rectangular ws block
 457     (while (progn (end-of-line)
 458                   (let ((cc (current-column)))
 459                     (if (< cc width)
 460                         (insert (substring line cc))
 461                       (delete-char (- width cc)))
 462                     (cond ((eobp) (insert "\n") nil)
 463                           (t (forward-char 1) t)))))
 464     ;; pad ws past bottom of screen
 465     (let ((nl (- height (count-lines (point-min) (point)))))
 466       (when (> nl 0)
 467         (setq line (concat line "\n"))
 468         (dotimes (i nl)
 469           (insert line))))
 470     (goto-char start)
 471     (recenter 0)
 472     (sit-for 0)))
 473
 474 (defun zone-fall-through-ws (c wbeg wend)
 475   (let* ((cw-ceil (ceiling (char-width (aref c 0))))
 476          (spaces (make-string cw-ceil 32))
 477          (col (current-column))
 478          (wait 0.15)
 479          newpos fall-p)
 480     (while (when (save-excursion
 481                    (and (zerop (forward-line 1))
 482                         (progn
 483                           (forward-char col)
 484                           (= col (current-column)))
 485                         (setq newpos (point))
 486                         (string= spaces (buffer-substring-no-properties
 487                                          newpos (+ newpos cw-ceil)))
 488                         (setq newpos (+ newpos (1- cw-ceil)))))
 489              (setq fall-p t)
 490              (delete-char 1)
 491              (insert spaces)
 492              (goto-char newpos)
 493              (when (< (point) wend)
 494                (delete-char cw-ceil)
 495                (insert c)
 496                (forward-char -1)
 497                (zone-park/sit-for wbeg (setq wait (* wait 0.8))))))
 498     fall-p))
 499
 500 (defun zone-pgm-drip (&optional fret-p pancake-p)
 501   (let* ((ww (1- (window-width)))
 502          (wh (window-height))
 503          (mc 0)                         ; miss count
 504          (total (* ww wh))
 505          (fall-p nil)
 506          wbeg wend c)
 507     (zone-fill-out-screen ww wh)
 508     (setq wbeg (window-start)
 509           wend (window-end))
 510     (catch 'done
 511       (while (not (input-pending-p))
 512         (setq mc 0 wend (window-end))
 513         ;; select non-ws character, but don't miss too much
 514         (goto-char (+ wbeg (random (- wend wbeg))))
 515         (while (looking-at "[ \n\f]")
 516           (if (= total (setq mc (1+ mc)))
 517               (throw 'done 'sel)
 518             (goto-char (+ wbeg (random (- wend wbeg))))))
 519         ;; character animation sequence
 520         (let ((p (point)))
 521           (when fret-p (zone-fret wbeg p))
 522           (goto-char p)
 523           (setq c (zone-cpos p)
 524                 fall-p (zone-fall-through-ws c wbeg wend)))
 525         ;; assuming current-column has not changed...
 526         (when (and pancake-p
 527                    fall-p
 528                    (< (count-lines (point-min) (point))
 529                       wh))
 530           (let ((cw (ceiling (char-width (aref c 0)))))
 531             (zone-replace-char cw   1 c ?@) (zone-park/sit-for wbeg 0.137)
 532             (zone-replace-char cw nil c ?*) (zone-park/sit-for wbeg 0.137)
 533             (zone-replace-char cw nil c ?_)))))))
 534
 535 (defun zone-pgm-drip-fretfully ()
 536   (zone-pgm-drip t))
 537
 538 (defun zone-pgm-five-oclock-swan-dive ()
 539   (zone-pgm-drip nil t))
 540
 541 (defun zone-pgm-martini-swan-dive ()
 542   (zone-pgm-drip t t))
 543
 544 (defun zone-pgm-rat-race ()
 545   (while (not (input-pending-p))
 546     (zone-call '((zone-pgm-rotate 10)
 547                  (zone-pgm-drip-fretfully 15)
 548                  (zone-pgm-drip 10)
 549                  ((lambda ()
 550                     (goto-char (point-min))
 551                     (while (re-search-forward " +$" nil t)
 552                       (delete-region (match-beginning 0) (match-end 0))))
 553                   5)))))
 554
 555
 556 ;;;; paragraph spazzing (for textish modes)
 557
 558 (defun zone-pgm-paragraph-spaz ()
 559   (if (memq (zone-orig major-mode)
 560             ;; there should be a better way to distinguish textish modes
 561             '(text-mode texinfo-mode fundamental-mode))
 562       (let ((fill-column fill-column)
 563             (fc-min fill-column)
 564             (fc-max fill-column)
 565             (max-fc (1- (frame-width))))
 566         (while (sit-for 0.1)
 567           (fill-paragraph 1)
 568           (setq fill-column (+ fill-column (- (random 5) 2)))
 569           (when (< fill-column fc-min)
 570             (setq fc-min fill-column))
 571           (when (> fill-column max-fc)
 572             (setq fill-column max-fc))
 573           (when (> fill-column fc-max)
 574             (setq fc-max fill-column))))
 575     (message "Zoning... (zone-pgm-rotate)")
 576     (zone-pgm-rotate)))
 577
 578
 579 ;;;; stressing and destressing
 580
 581 (defun zone-pgm-stress ()
 582   (goto-char (point-min))
 583   (let ((ok t)
 584         lines)
 585     (while (and ok (< (point) (point-max)))
 586       (let ((p (point)))
 587         (setq ok (zerop (forward-line 1))
 588               lines (cons (buffer-substring p (point)) lines))))
 589     (sit-for 5)
 590     (zone-hiding-modeline
 591      (let ((msg "Zoning... (zone-pgm-stress)"))
 592        (while (not (string= msg ""))
 593          (message (setq msg (substring msg 1)))
 594          (sit-for 0.05)))
 595      (while (not (input-pending-p))
 596        (when (< 50 (random 100))
 597          (goto-char (point-max))
 598          (forward-line -1)
 599          (let ((kill-whole-line t))
 600            (kill-line))
 601          (goto-char (point-min))
 602          (insert (nth (random (length lines)) lines)))
 603        (message (concat (make-string (random (- (frame-width) 5)) ? ) "grrr"))
 604        (sit-for 0.1)))))
 605
 606 (defun zone-pgm-stress-destress ()
 607   (zone-call 'zone-pgm-stress 25)
 608   (zone-hiding-modeline
 609    (sit-for 3)
 610    (erase-buffer)
 611    (sit-for 3)
 612    (insert-buffer-substring "*Messages*")
 613    (message "")
 614    (goto-char (point-max))
 615    (recenter -1)
 616    (sit-for 3)
 617    (delete-region (point-min) (window-start))
 618    (message "hey why stress out anyway?")
 619    (zone-call '((zone-pgm-rotate         30)
 620                 (zone-pgm-whack-chars    10)
 621                 zone-pgm-drip))))
 622
 623
 624 ;;;; the lyfe so short the craft so long to lerne --chaucer
 625
 626 (defvar zone-pgm-random-life-wait nil
 627   "*Seconds to wait between successive `life' generations.
 628 If nil, `zone-pgm-random-life' chooses a value from 0-3 (inclusive).")
 629
 630 (defun zone-pgm-random-life ()
 631   (require 'life)
 632   (zone-fill-out-screen (1- (window-width)) (1- (window-height)))
 633   (let ((top (progn (goto-char (window-start)) (forward-line 7) (point)))
 634         (bot (progn (goto-char (window-end)) (forward-line -7) (point)))
 635         (rtc (- (frame-width) 11))
 636         (min (window-start))
 637         (max (1- (window-end)))
 638         s c col)
 639     (delete-region max (point-max))
 640     (while (and (progn (goto-char min) (sit-for 0.05))
 641                 (progn (goto-char (+ min (random max)))
 642                        (or (progn (skip-chars-forward " @\n" max)
 643                                   (not (= max (point))))
 644                            (unless (or (= 0 (skip-chars-backward " @\n" min))
 645                                        (= min (point)))
 646                              (forward-char -1)
 647                              t))))
 648       (unless (or (eolp) (eobp))
 649         (setq s (zone-cpos (point))
 650               c (aref s 0))
 651         (zone-replace-char
 652          (char-width c)
 653          1 s (cond ((or (> top (point))
 654                         (< bot (point))
 655                         (or (> 11 (setq col (current-column)))
 656                             (< rtc col)))
 657                     32)
 658                    ((and (<= ?a c) (>= ?z c)) (+ c (- ?A ?a)))
 659                    ((and (<= ?A c) (>= ?Z c)) ?*)
 660                    (t ?@)))))
 661     (sit-for 3)
 662     (setq col nil)
 663     (goto-char bot)
 664     (while (< top (point))
 665       (setq c (point))
 666       (move-to-column 9)
 667       (setq col (cons (buffer-substring (point) c) col))
 668 ;      (let ((inhibit-point-motion-hooks t))
 669         (end-of-line 0);)
 670       (forward-char -10))
 671     (let ((life-patterns (vector
 672                           (if (and col (search-forward "@" max t))
 673                               (cons (make-string (length (car col)) 32) col)
 674                             (list (mapconcat 'identity
 675                                              (make-list (/ (- rtc 11) 15)
 676                                                         (make-string 5 ?@))
 677                                              (make-string 10 32)))))))
 678       (life (or zone-pgm-random-life-wait (random 4)))
 679       (kill-buffer nil))))
 680
 681
 682 (random t)
 683
 684 ;;;;;;;;;;;;;;;
 685 (provide 'zone)
 686
 687 ;;; zone.el ends here