lisp/play/zone.el

   1 ;;; zone.el --- idle display hacks
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 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, or (at your option)
  16 ;; 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; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26 ;; Boston, MA 02110-1301, USA.
  27
  28 ;;; Commentary:
  29
  30 ;; Don't zone out in front of Emacs!  Try M-x zone.
  31 ;; If it eventually irritates you, try M-x zone-leave-me-alone.
  32
  33 ;; Bored by the zone pyrotechnics?  Write your own!  Add it to
  34 ;; `zone-programs'.  See `zone-call' for higher-ordered zoning.
  35
  36 ;; WARNING: Not appropriate for Emacs sessions over modems or
  37 ;;          computers as slow as mine.
  38
  39 ;; THANKS: Christopher Mayer, Scott Flinchbaugh,
  40 ;;         Rachel Kalmar, Max Froumentin, Juri Linkov,
  41 ;;         Luigi Panzeri, John Paul Wallington.
  42
  43 ;;; Code:
  44
  45 (require 'timer)
  46 (require 'tabify)
  47 (eval-when-compile (require 'cl))
  48
  49 (defvar zone-timer nil
  50   "The timer we use to decide when to zone out, or nil if none.")
  51
  52 (defvar zone-timeout nil
  53   "*Seconds to timeout the zoning.
  54 If nil, don't interrupt for about 1^26 seconds.")
  55
  56 ;; Vector of functions that zone out.  `zone' will execute one of
  57 ;; these functions, randomly chosen.  The chosen function is invoked
  58 ;; in the *zone* buffer, which contains the text of the selected
  59 ;; window.  If the function loops, it *must* periodically check and
  60 ;; halt if `input-pending-p' is t (because quitting is disabled when
  61 ;; Emacs idle timers are run).
  62 (defvar zone-programs [
  63                        zone-pgm-jitter
  64                        zone-pgm-putz-with-case
  65                        zone-pgm-dissolve
  66                        ;; zone-pgm-explode
  67                        zone-pgm-whack-chars
  68                        zone-pgm-rotate
  69                        zone-pgm-rotate-LR-lockstep
  70                        zone-pgm-rotate-RL-lockstep
  71                        zone-pgm-rotate-LR-variable
  72                        zone-pgm-rotate-RL-variable
  73                        zone-pgm-drip
  74                        zone-pgm-drip-fretfully
  75                        zone-pgm-five-oclock-swan-dive
  76                        zone-pgm-martini-swan-dive
  77                        zone-pgm-rat-race
  78                        zone-pgm-paragraph-spaz
  79                        zone-pgm-stress
  80                        zone-pgm-stress-destress
  81                        zone-pgm-random-life
  82                        ])
  83
  84 (defmacro zone-orig (&rest body)
  85   `(with-current-buffer (get 'zone 'orig-buffer)
  86      ,@body))
  87
  88 (defmacro zone-hiding-modeline (&rest body)
  89   ;; This formerly worked by temporarily altering face `mode-line',
  90   ;; which did not even work right, it seems.
  91   `(let (mode-line-format)
  92      ,@body))
  93
  94 (defun zone-call (program &optional timeout)
  95   "Call PROGRAM in a zoned way.
  96 If PROGRAM is a function, call it, interrupting after the amount
  97  of time in seconds specified by optional arg TIMEOUT, or `zone-timeout'
  98  if unspecified, q.v.
  99 PROGRAM can also be a list of elements, which are interpreted like so:
 100 If the element is a function or a list of a function and a number,
 101  apply `zone-call' recursively."
 102   (cond ((functionp program)
 103          (with-timeout ((or timeout zone-timeout (ash 1 26)))
 104            (funcall program)))
 105         ((listp program)
 106          (mapcar (lambda (elem)
 107                    (cond ((functionp elem) (zone-call elem))
 108                          ((and (listp elem)
 109                                (functionp (car elem))
 110                                (numberp (cadr elem)))
 111                           (apply 'zone-call elem))
 112                          (t (error "bad `zone-call' elem: %S" elem))))
 113                  program))))
 114
 115 ;;;###autoload
 116 (defun zone ()
 117   "Zone out, completely."
 118   (interactive)
 119   (save-window-excursion
 120     (let ((f (selected-frame))
 121           (outbuf (get-buffer-create "*zone*"))
 122           (text (buffer-substring (window-start) (window-end)))
 123           (wp (1+ (- (window-point (selected-window))
 124                      (window-start)))))
 125       (put 'zone 'orig-buffer (current-buffer))
 126       (put 'zone 'modeline-hidden-level 0)
 127       (switch-to-buffer outbuf)
 128       (setq mode-name "Zone")
 129       (erase-buffer)
 130       (setq buffer-undo-list t
 131             truncate-lines t
 132             tab-width (zone-orig tab-width)
 133             line-spacing (zone-orig line-spacing))
 134       (insert text)
 135       (untabify (point-min) (point-max))
 136       (set-window-start (selected-window) (point-min))
 137       (set-window-point (selected-window) wp)
 138       (sit-for 0 500)
 139       (let ((pgm (elt zone-programs (random (length zone-programs))))
 140             (ct (and f (frame-parameter f 'cursor-type)))
 141             (restore (list '(kill-buffer outbuf))))
 142         (when ct
 143           (modify-frame-parameters f '((cursor-type . (bar . 0))))
 144           (setq restore (cons '(modify-frame-parameters
 145                                 f (list (cons 'cursor-type ct)))
 146                               restore)))
 147         ;; Make `restore' a self-disabling one-shot thunk.
 148         (setq restore `(lambda () ,@restore (setq restore nil)))
 149         (condition-case nil
 150             (progn
 151               (message "Zoning... (%s)" pgm)
 152               (garbage-collect)
 153               ;; If some input is pending, zone says "sorry", which
 154               ;; isn't nice; this might happen e.g. when they invoke the
 155               ;; game by clicking the menu bar.  So discard any pending
 156               ;; input before zoning out.
 157               (if (input-pending-p)
 158                   (discard-input))
 159               (zone-call pgm)
 160               (message "Zoning...sorry"))
 161           (error
 162            (funcall restore)
 163            (while (not (input-pending-p))
 164              (message "We were zoning when we wrote %s..." pgm)
 165              (sit-for 3)
 166              (message "...here's hoping we didn't hose your buffer!")
 167              (sit-for 3)))
 168           (quit
 169            (funcall restore)
 170            (ding)
 171            (message "Zoning...sorry")))
 172         (when restore (funcall restore))))))
 173
 174 ;;;; Zone when idle, or not.
 175
 176 (defun zone-when-idle (secs)
 177   "Zone out when Emacs has been idle for SECS seconds."
 178   (interactive "nHow long before I start zoning (seconds): ")
 179   (if (timerp zone-timer)
 180       (cancel-timer zone-timer))
 181   (setq zone-timer nil)
 182   (or (<= secs 0)
 183       (setq zone-timer (run-with-idle-timer secs t 'zone))))
 184
 185 (defun zone-leave-me-alone ()
 186   "Don't zone out when Emacs is idle."
 187   (interactive)
 188   (if (timerp zone-timer)
 189       (cancel-timer zone-timer))
 190   (setq zone-timer nil)
 191   (message "I won't zone out any more"))
 192
 193
 194 ;;;; jittering
 195
 196 (defun zone-shift-up ()
 197   (let* ((b (point))
 198          (e (progn (forward-line 1) (point)))
 199          (s (buffer-substring b e)))
 200     (delete-region b e)
 201     (goto-char (point-max))
 202     (insert s)))
 203
 204 (defun zone-shift-down ()
 205   (goto-char (point-max))
 206   (let* ((b (point))
 207          (e (progn (forward-line -1) (point)))
 208          (s (buffer-substring b e)))
 209     (delete-region b e)
 210     (goto-char (point-min))
 211     (insert s)))
 212
 213 (defun zone-shift-left ()
 214   (let (s)
 215     (while (not (eobp))
 216       (unless (eolp)
 217         (setq s (buffer-substring (point) (1+ (point))))
 218         (delete-char 1)
 219         (end-of-line)
 220         (insert s))
 221       (forward-char 1))))
 222
 223 (defun zone-shift-right ()
 224   (goto-char (point-max))
 225   (end-of-line)
 226   (let (s)
 227     (while (not (bobp))
 228       (unless (bolp)
 229         (setq s (buffer-substring (1- (point)) (point)))
 230         (delete-char -1)
 231         (beginning-of-line)
 232         (insert s))
 233       (end-of-line 0))))
 234
 235 (defun zone-pgm-jitter ()
 236   (let ((ops [
 237               zone-shift-left
 238               zone-shift-right
 239               zone-shift-down
 240               zone-shift-up
 241               ]))
 242     (goto-char (point-min))
 243     (while (not (input-pending-p))
 244       (funcall (elt ops (random (length ops))))
 245       (goto-char (point-min))
 246       (sit-for 0 10))))
 247
 248
 249 ;;;; whacking chars
 250
 251 (defun zone-pgm-whack-chars ()
 252   (let ((tbl (copy-sequence (get 'zone-pgm-whack-chars 'wc-tbl))))
 253     (while (not (input-pending-p))
 254       (let ((i 48))
 255         (while (< i 122)
 256           (aset tbl i (+ 48 (random (- 123 48))))
 257           (setq i (1+ i)))
 258         (translate-region (point-min) (point-max) tbl)
 259         (sit-for 0 2)))))
 260
 261 (put 'zone-pgm-whack-chars 'wc-tbl
 262      (let ((tbl (make-string 128 ?x))
 263            (i 0))
 264        (while (< i 128)
 265          (aset tbl i i)
 266          (setq i (1+ i)))
 267        tbl))
 268
 269 ;;;; dissolving
 270
 271 (defun zone-remove-text ()
 272   (let ((working t))
 273     (while working
 274       (setq working nil)
 275       (save-excursion
 276         (goto-char (point-min))
 277         (while (not (eobp))
 278           (if (looking-at "[^(){}\n\t ]")
 279               (let ((n (random 5)))
 280                 (if (not (= n 0))
 281                     (progn
 282                       (setq working t)
 283                       (forward-char 1))
 284                   (delete-char 1)
 285                   (insert " ")))
 286             (forward-char 1))))
 287       (sit-for 0 2))))
 288
 289 (defun zone-pgm-dissolve ()
 290   (zone-remove-text)
 291   (zone-pgm-jitter))
 292
 293
 294 ;;;; exploding
 295
 296 (defun zone-exploding-remove ()
 297   (let ((i 0))
 298     (while (< i 5)
 299       (save-excursion
 300         (goto-char (point-min))
 301         (while (not (eobp))
 302           (if (looking-at "[^*\n\t ]")
 303               (let ((n (random 5)))
 304                 (if (not (= n 0))
 305                     (forward-char 1))
 306                 (insert " ")))
 307           (forward-char 1)))
 308       (setq i (1+ i))
 309       (sit-for 0 2)))
 310   (zone-pgm-jitter))
 311
 312 (defun zone-pgm-explode ()
 313   (zone-exploding-remove)
 314   (zone-pgm-jitter))
 315
 316
 317 ;;;; putzing w/ case
 318
 319 ;; Faster than `zone-pgm-putz-with-case', but not as good: all
 320 ;; instances of the same letter have the same case, which produces a
 321 ;; less interesting effect than you might imagine.
 322 (defun zone-pgm-2nd-putz-with-case ()
 323   (let ((tbl (make-string 128 ?x))
 324         (i 0))
 325     (while (< i 128)
 326       (aset tbl i i)
 327       (setq i (1+ i)))
 328     (while (not (input-pending-p))
 329       (setq i ?a)
 330       (while (<= i ?z)
 331         (aset tbl i
 332               (if (zerop (random 5))
 333                   (upcase i)
 334                 (downcase i)))
 335         (setq i (+ i (1+ (random 5)))))
 336       (setq i ?A)
 337       (while (<= i ?z)
 338         (aset tbl i
 339               (if (zerop (random 5))
 340                   (downcase i)
 341                 (upcase i)))
 342         (setq i (+ i (1+ (random 5)))))
 343       (translate-region (point-min) (point-max) tbl)
 344       (sit-for 0 2))))
 345
 346 (defun zone-pgm-putz-with-case ()
 347   (goto-char (point-min))
 348   (while (not (input-pending-p))
 349     (let ((np (+ 2 (random 5)))
 350           (pm (point-max)))
 351       (while (< np pm)
 352         (goto-char np)
 353         (let ((prec (preceding-char))
 354               (props (text-properties-at (1- (point)))))
 355           (insert (if (zerop (random 2))
 356                       (upcase prec)
 357                     (downcase prec)))
 358           (set-text-properties (1- (point)) (point) props))
 359         (backward-char 2)
 360         (delete-char 1)
 361         (setq np (+ np (1+ (random 5))))))
 362     (goto-char (point-min))
 363     (sit-for 0 2)))
 364
 365
 366 ;;;; rotating
 367
 368 (defun zone-line-specs ()
 369   (let (ret)
 370     (save-excursion
 371       (goto-char (window-start))
 372       (while (< (point) (window-end))
 373         (when (looking-at "[\t ]*\\([^\n]+\\)")
 374           (setq ret (cons (cons (match-beginning 1) (match-end 1)) ret)))
 375         (forward-line 1)))
 376     ret))
 377
 378 (defun zone-pgm-rotate (&optional random-style)
 379   (let* ((specs (apply
 380                  'vector
 381                  (let (res)
 382                    (mapc (lambda (ent)
 383                            (let* ((beg (car ent))
 384                                   (end (cdr ent))
 385                                   (amt (if random-style
 386                                            (funcall random-style)
 387                                          (- (random 7) 3))))
 388                              (when (< (- end (abs amt)) beg)
 389                                (setq amt (random (- end beg))))
 390                              (unless (= 0 amt)
 391                                (setq res
 392                                      (cons
 393                                       (vector amt beg (- end (abs amt)))
 394                                       res)))))
 395                          (zone-line-specs))
 396                    res)))
 397          (n (length specs))
 398          amt aamt cut paste txt i ent)
 399     (while (not (input-pending-p))
 400       (setq i 0)
 401       (while (< i n)
 402         (setq ent (aref specs i))
 403         (setq amt (aref ent 0) aamt (abs amt))
 404         (if (> 0 amt)
 405             (setq cut 1 paste 2)
 406           (setq cut 2 paste 1))
 407         (goto-char (aref ent cut))
 408         (setq txt (buffer-substring (point) (+ (point) aamt)))
 409         (delete-char aamt)
 410         (goto-char (aref ent paste))
 411         (insert txt)
 412         (setq i (1+ i)))
 413       (sit-for 0.04))))
 414
 415 (defun zone-pgm-rotate-LR-lockstep ()
 416   (zone-pgm-rotate (lambda () 1)))
 417
 418 (defun zone-pgm-rotate-RL-lockstep ()
 419   (zone-pgm-rotate (lambda () -1)))
 420
 421 (defun zone-pgm-rotate-LR-variable ()
 422   (zone-pgm-rotate (lambda () (1+ (random 3)))))
 423
 424 (defun zone-pgm-rotate-RL-variable ()
 425   (zone-pgm-rotate (lambda () (1- (- (random 3))))))
 426
 427
 428 ;;;; dripping
 429
 430 (defsubst zone-cpos (pos)
 431   (buffer-substring pos (1+ pos)))
 432
 433 (defsubst zone-replace-char (count del-count char-as-string new-value)
 434   (delete-char (or del-count (- count)))
 435   (aset char-as-string 0 new-value)
 436   (dotimes (i count) (insert char-as-string)))
 437
 438 (defsubst zone-park/sit-for (pos seconds)
 439   (let ((p (point)))
 440     (goto-char pos)
 441     (prog1 (sit-for seconds)
 442       (goto-char p))))
 443
 444 (defun zone-fret (wbeg pos)
 445   (let* ((case-fold-search nil)
 446          (c-string (zone-cpos pos))
 447          (cw-ceil (ceiling (char-width (aref c-string 0))))
 448          (hmm (cond
 449                ((string-match "[a-z]" c-string) (upcase c-string))
 450                ((string-match "[A-Z]" c-string) (downcase c-string))
 451                (t (propertize " " 'display `(space :width ,cw-ceil))))))
 452     (do ((i 0 (1+ i))
 453          (wait 0.5 (* wait 0.8)))
 454         ((= i 20))
 455       (goto-char pos)
 456       (delete-char 1)
 457       (insert (if (= 0 (% i 2)) hmm c-string))
 458       (zone-park/sit-for wbeg wait))
 459     (delete-char -1) (insert c-string)))
 460
 461 (defun zone-fill-out-screen (width height)
 462   (let ((start (window-start))
 463         (line (make-string width 32)))
 464     (goto-char start)
 465     ;; fill out rectangular ws block
 466     (while (progn (end-of-line)
 467                   (let ((cc (current-column)))
 468                     (if (< cc width)
 469                         (insert (substring line cc))
 470                       (delete-char (- width cc)))
 471                     (cond ((eobp) (insert "\n") nil)
 472                           (t (forward-char 1) t)))))
 473     ;; pad ws past bottom of screen
 474     (let ((nl (- height (count-lines (point-min) (point)))))
 475       (when (> nl 0)
 476         (setq line (concat line "\n"))
 477         (do ((i 0 (1+ i)))
 478             ((= i nl))
 479           (insert line))))
 480     (goto-char start)
 481     (recenter 0)
 482     (sit-for 0)))
 483
 484 (defun zone-fall-through-ws (c wbeg wend)
 485   (let* ((cw-ceil (ceiling (char-width (aref c 0))))
 486          (spaces (make-string cw-ceil 32))
 487          (col (current-column))
 488          (wait 0.15)
 489          newpos fall-p)
 490     (while (when (save-excursion
 491                    (next-line 1)
 492                    (and (= col (current-column))
 493                         (setq newpos (point))
 494                         (string= spaces (buffer-substring-no-properties
 495                                          newpos (+ newpos cw-ceil)))
 496                         (setq newpos (+ newpos (1- cw-ceil)))))
 497              (setq fall-p t)
 498              (delete-char 1)
 499              (insert spaces)
 500              (goto-char newpos)
 501              (when (< (point) wend)
 502                (delete-char cw-ceil)
 503                (insert c)
 504                (forward-char -1)
 505                (zone-park/sit-for wbeg (setq wait (* wait 0.8))))))
 506     fall-p))
 507
 508 (defun zone-pgm-drip (&optional fret-p pancake-p)
 509   (let* ((ww (1- (window-width)))
 510          (wh (window-height))
 511          (mc 0)                         ; miss count
 512          (total (* ww wh))
 513          (fall-p nil)
 514          wbeg wend c)
 515     (zone-fill-out-screen ww wh)
 516     (setq wbeg (window-start)
 517           wend (window-end))
 518     (catch 'done
 519       (while (not (input-pending-p))
 520         (setq mc 0 wend (window-end))
 521         ;; select non-ws character, but don't miss too much
 522         (goto-char (+ wbeg (random (- wend wbeg))))
 523         (while (looking-at "[ \n\f]")
 524           (if (= total (setq mc (1+ mc)))
 525               (throw 'done 'sel)
 526             (goto-char (+ wbeg (random (- wend wbeg))))))
 527         ;; character animation sequence
 528         (let ((p (point)))
 529           (when fret-p (zone-fret wbeg p))
 530           (goto-char p)
 531           (setq c (zone-cpos p)
 532                 fall-p (zone-fall-through-ws c wbeg wend)))
 533         ;; assuming current-column has not changed...
 534         (when (and pancake-p
 535                    fall-p
 536                    (< (count-lines (point-min) (point))
 537                       wh))
 538           (let ((cw (ceiling (char-width (aref c 0)))))
 539             (zone-replace-char cw   1 c ?@) (zone-park/sit-for wbeg 0.137)
 540             (zone-replace-char cw nil c ?*) (zone-park/sit-for wbeg 0.137)
 541             (zone-replace-char cw nil c ?_)))))))
 542
 543 (defun zone-pgm-drip-fretfully ()
 544   (zone-pgm-drip t))
 545
 546 (defun zone-pgm-five-oclock-swan-dive ()
 547   (zone-pgm-drip nil t))
 548
 549 (defun zone-pgm-martini-swan-dive ()
 550   (zone-pgm-drip t t))
 551
 552 (defun zone-pgm-rat-race ()
 553   (while (not (input-pending-p))
 554     (zone-call '((zone-pgm-rotate 10)
 555                  (zone-pgm-drip-fretfully 15)
 556                  (zone-pgm-drip 10)
 557                  ((lambda ()
 558                     (goto-char (point-min))
 559                     (while (re-search-forward " +$" nil t)
 560                       (delete-region (match-beginning 0) (match-end 0))))
 561                   5)))))
 562
 563
 564 ;;;; paragraph spazzing (for textish modes)
 565
 566 (defun zone-pgm-paragraph-spaz ()
 567   (if (memq (zone-orig major-mode)
 568             ;; there should be a better way to distinguish textish modes
 569             '(text-mode texinfo-mode fundamental-mode))
 570       (let ((fill-column fill-column)
 571             (fc-min fill-column)
 572             (fc-max fill-column)
 573             (max-fc (1- (frame-width))))
 574         (while (sit-for 0.1)
 575           (fill-paragraph 1)
 576           (setq fill-column (+ fill-column (- (random 5) 2)))
 577           (when (< fill-column fc-min)
 578             (setq fc-min fill-column))
 579           (when (> fill-column max-fc)
 580             (setq fill-column max-fc))
 581           (when (> fill-column fc-max)
 582             (setq fc-max fill-column))))
 583     (message "Zoning... (zone-pgm-rotate)")
 584     (zone-pgm-rotate)))
 585
 586
 587 ;;;; stressing and destressing
 588
 589 (defun zone-pgm-stress ()
 590   (goto-char (point-min))
 591   (let (lines)
 592     (while (< (point) (point-max))
 593       (let ((p (point)))
 594         (forward-line 1)
 595         (setq lines (cons (buffer-substring p (point)) lines))))
 596     (sit-for 5)
 597     (zone-hiding-modeline
 598      (let ((msg "Zoning... (zone-pgm-stress)"))
 599        (while (not (string= msg ""))
 600          (message (setq msg (substring msg 1)))
 601          (sit-for 0.05)))
 602      (while (not (input-pending-p))
 603        (when (< 50 (random 100))
 604          (goto-char (point-max))
 605          (forward-line -1)
 606          (let ((kill-whole-line t))
 607            (kill-line))
 608          (goto-char (point-min))
 609          (insert (nth (random (length lines)) lines)))
 610        (message (concat (make-string (random (- (frame-width) 5)) ? ) "grrr"))
 611        (sit-for 0.1)))))
 612
 613 (defun zone-pgm-stress-destress ()
 614   (zone-call 'zone-pgm-stress 25)
 615   (zone-hiding-modeline
 616    (sit-for 3)
 617    (erase-buffer)
 618    (sit-for 3)
 619    (insert-buffer-substring "*Messages*")
 620    (message "")
 621    (goto-char (point-max))
 622    (recenter -1)
 623    (sit-for 3)
 624    (delete-region (point-min) (window-start))
 625    (message "hey why stress out anyway?")
 626    (zone-call '((zone-pgm-rotate         30)
 627                 (zone-pgm-whack-chars    10)
 628                 zone-pgm-drip))))
 629
 630
 631 ;;;; the lyfe so short the craft so long to lerne --chaucer
 632
 633 (defvar zone-pgm-random-life-wait nil
 634   "*Seconds to wait between successive `life' generations.
 635 If nil, `zone-pgm-random-life' chooses a value from 0-3 (inclusive).")
 636
 637 (defun zone-pgm-random-life ()
 638   (require 'life)
 639   (zone-fill-out-screen (1- (window-width)) (1- (window-height)))
 640   (let ((top (progn (goto-char (window-start)) (forward-line 7) (point)))
 641         (bot (progn (goto-char (window-end)) (forward-line -7) (point)))
 642         (rtc (- (frame-width) 11))
 643         (min (window-start))
 644         (max (1- (window-end)))
 645         s c col)
 646     (delete-region max (point-max))
 647     (while (and (progn (goto-char min) (sit-for 0.05))
 648                 (progn (goto-char (+ min (random max)))
 649                        (or (progn (skip-chars-forward " @\n" max)
 650                                   (not (= max (point))))
 651                            (unless (or (= 0 (skip-chars-backward " @\n" min))
 652                                        (= min (point)))
 653                              (forward-char -1)
 654                              t))))
 655       (unless (or (eolp) (eobp))
 656         (setq s (zone-cpos (point))
 657               c (aref s 0))
 658         (zone-replace-char
 659          (char-width c)
 660          1 s (cond ((or (> top (point))
 661                         (< bot (point))
 662                         (or (> 11 (setq col (current-column)))
 663                             (< rtc col)))
 664                     32)
 665                    ((and (<= ?a c) (>= ?z c)) (+ c (- ?A ?a)))
 666                    ((and (<= ?A c) (>= ?Z c)) ?*)
 667                    (t ?@)))))
 668     (sit-for 3)
 669     (setq col nil)
 670     (goto-char bot)
 671     (while (< top (point))
 672       (setq c (point))
 673       (move-to-column 9)
 674       (setq col (cons (buffer-substring (point) c) col))
 675       (end-of-line 0)
 676       (forward-char -10))
 677     (let ((life-patterns (vector
 678                           (if (and col (search-forward "@" max t))
 679                               (cons (make-string (length (car col)) 32) col)
 680                             (list (mapconcat 'identity
 681                                              (make-list (/ (- rtc 11) 15)
 682                                                         (make-string 5 ?@))
 683                                              (make-string 10 32)))))))
 684       (life (or zone-pgm-random-life-wait (random 4)))
 685       (kill-buffer nil))))
 686
 687 (random t)
 688
 689 ;;;;;;;;;;;;;;;
 690 (provide 'zone)
 691
 692 ;;; arch-tag: 7092503d-74a9-4325-a55c-a026ede58cea
 693 ;;; zone.el ends here