lisp/play/zone.el

   1 ;;; zone.el --- idle display hacks
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 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 (require 'timer)
  44 (require 'tabify)
  45 (eval-when-compile (require 'cl))
  46
  47 (defvar zone-timer nil
  48   "The timer we use to decide when to zone out, or nil if none.")
  49
  50 (defvar zone-timeout nil
  51   "*Seconds to timeout the zoning.
  52 If nil, don't interrupt for about 1^26 seconds.")
  53
  54 ;; Vector of functions that zone out.  `zone' will execute one of
  55 ;; these functions, randomly chosen.  The chosen function is invoked
  56 ;; in the *zone* buffer, which contains the text of the selected
  57 ;; window.  If the function loops, it *must* periodically check and
  58 ;; halt if `input-pending-p' is t (because quitting is disabled when
  59 ;; Emacs idle timers are run).
  60 (defvar zone-programs [
  61                        zone-pgm-jitter
  62                        zone-pgm-putz-with-case
  63                        zone-pgm-dissolve
  64                        ;; zone-pgm-explode
  65                        zone-pgm-whack-chars
  66                        zone-pgm-rotate
  67                        zone-pgm-rotate-LR-lockstep
  68                        zone-pgm-rotate-RL-lockstep
  69                        zone-pgm-rotate-LR-variable
  70                        zone-pgm-rotate-RL-variable
  71                        zone-pgm-drip
  72                        zone-pgm-drip-fretfully
  73                        zone-pgm-five-oclock-swan-dive
  74                        zone-pgm-martini-swan-dive
  75                        zone-pgm-rat-race
  76                        zone-pgm-paragraph-spaz
  77                        zone-pgm-stress
  78                        zone-pgm-stress-destress
  79                        zone-pgm-random-life
  80                        ])
  81
  82 (defmacro zone-orig (&rest body)
  83   `(with-current-buffer (get 'zone 'orig-buffer)
  84      ,@body))
  85
  86 (defmacro zone-hiding-modeline (&rest body)
  87   ;; This formerly worked by temporarily altering face `mode-line',
  88   ;; which did not even work right, it seems.
  89   `(let (mode-line-format)
  90      ,@body))
  91
  92 (defun zone-call (program &optional timeout)
  93   "Call PROGRAM in a zoned way.
  94 If PROGRAM is a function, call it, interrupting after the amount
  95  of time in seconds specified by optional arg TIMEOUT, or `zone-timeout'
  96  if unspecified, q.v.
  97 PROGRAM can also be a list of elements, which are interpreted like so:
  98 If the element is a function or a list of a function and a number,
  99  apply `zone-call' recursively."
 100   (cond ((functionp program)
 101          (with-timeout ((or timeout zone-timeout (ash 1 26)))
 102            (funcall program)))
 103         ((listp program)
 104          (mapcar (lambda (elem)
 105                    (cond ((functionp elem) (zone-call elem))
 106                          ((and (listp elem)
 107                                (functionp (car elem))
 108                                (numberp (cadr elem)))
 109                           (apply 'zone-call elem))
 110                          (t (error "bad `zone-call' elem: %S" elem))))
 111                  program))))
 112
 113 ;;;###autoload
 114 (defun zone ()
 115   "Zone out, completely."
 116   (interactive)
 117   (save-window-excursion
 118     (let ((f (selected-frame))
 119           (outbuf (get-buffer-create "*zone*"))
 120           (text (buffer-substring (window-start) (window-end)))
 121           (wp (1+ (- (window-point (selected-window))
 122                      (window-start)))))
 123       (put 'zone 'orig-buffer (current-buffer))
 124       (put 'zone 'modeline-hidden-level 0)
 125       (switch-to-buffer outbuf)
 126       (setq mode-name "Zone")
 127       (erase-buffer)
 128       (setq buffer-undo-list t
 129             truncate-lines t
 130             tab-width (zone-orig tab-width)
 131             line-spacing (zone-orig line-spacing))
 132       (insert text)
 133       (untabify (point-min) (point-max))
 134       (set-window-start (selected-window) (point-min))
 135       (set-window-point (selected-window) wp)
 136       (sit-for 0 500)
 137       (let ((pgm (elt zone-programs (random (length zone-programs))))
 138             (ct (and f (frame-parameter f 'cursor-type)))
 139             (show-trailing-whitespace nil)
 140             (restore (list '(kill-buffer outbuf))))
 141         (when ct
 142           (modify-frame-parameters f '((cursor-type . (bar . 0))))
 143           (setq restore (cons '(modify-frame-parameters
 144                                 f (list (cons 'cursor-type ct)))
 145                               restore)))
 146         ;; Make `restore' a self-disabling one-shot thunk.
 147         (setq restore `(lambda () ,@restore (setq restore nil)))
 148         (condition-case nil
 149             (progn
 150               (message "Zoning... (%s)" pgm)
 151               (garbage-collect)
 152               ;; If some input is pending, zone says "sorry", which
 153               ;; isn't nice; this might happen e.g. when they invoke the
 154               ;; game by clicking the menu bar.  So discard any pending
 155               ;; input before zoning out.
 156               (if (input-pending-p)
 157                   (discard-input))
 158               (zone-call pgm)
 159               (message "Zoning...sorry"))
 160           (error
 161            (funcall restore)
 162            (while (not (input-pending-p))
 163              (message "We were zoning when we wrote %s..." pgm)
 164              (sit-for 3)
 165              (message "...here's hoping we didn't hose your buffer!")
 166              (sit-for 3)))
 167           (quit
 168            (funcall restore)
 169            (ding)
 170            (message "Zoning...sorry")))
 171         (when restore (funcall restore))))))
 172
 173 ;;;; Zone when idle, or not.
 174
 175 (defun zone-when-idle (secs)
 176   "Zone out when Emacs has been idle for SECS seconds."
 177   (interactive "nHow long before I start zoning (seconds): ")
 178   (if (timerp zone-timer)
 179       (cancel-timer zone-timer))
 180   (setq zone-timer nil)
 181   (or (<= secs 0)
 182       (setq zone-timer (run-with-idle-timer secs t 'zone))))
 183
 184 (defun zone-leave-me-alone ()
 185   "Don't zone out when Emacs is idle."
 186   (interactive)
 187   (if (timerp zone-timer)
 188       (cancel-timer zone-timer))
 189   (setq zone-timer nil)
 190   (message "I won't zone out any more"))
 191
 192
 193 ;;;; jittering
 194
 195 (defun zone-shift-up ()
 196   (let* ((b (point))
 197          (e (progn (forward-line 1) (point)))
 198          (s (buffer-substring b e)))
 199     (delete-region b e)
 200     (goto-char (point-max))
 201     (insert s)))
 202
 203 (defun zone-shift-down ()
 204   (goto-char (point-max))
 205   (let* ((b (point))
 206          (e (progn (forward-line -1) (point)))
 207          (s (buffer-substring b e)))
 208     (delete-region b e)
 209     (goto-char (point-min))
 210     (insert s)))
 211
 212 (defun zone-shift-left ()
 213   (let (s)
 214     (while (not (eobp))
 215       (unless (eolp)
 216         (setq s (buffer-substring (point) (1+ (point))))
 217         (delete-char 1)
 218         (end-of-line)
 219         (insert s))
 220       (forward-char 1))))
 221
 222 (defun zone-shift-right ()
 223   (goto-char (point-max))
 224   (end-of-line)
 225   (let (s)
 226     (while (not (bobp))
 227       (unless (bolp)
 228         (setq s (buffer-substring (1- (point)) (point)))
 229         (delete-char -1)
 230         (beginning-of-line)
 231         (insert s))
 232       (end-of-line 0))))
 233
 234 (defun zone-pgm-jitter ()
 235   (let ((ops [
 236               zone-shift-left
 237               zone-shift-right
 238               zone-shift-down
 239               zone-shift-up
 240               ]))
 241     (goto-char (point-min))
 242     (while (not (input-pending-p))
 243       (funcall (elt ops (random (length ops))))
 244       (goto-char (point-min))
 245       (sit-for 0 10))))
 246
 247
 248 ;;;; whacking chars
 249
 250 (defun zone-pgm-whack-chars ()
 251   (let ((tbl (copy-sequence (get 'zone-pgm-whack-chars 'wc-tbl))))
 252     (while (not (input-pending-p))
 253       (let ((i 48))
 254         (while (< i 122)
 255           (aset tbl i (+ 48 (random (- 123 48))))
 256           (setq i (1+ i)))
 257         (translate-region (point-min) (point-max) tbl)
 258         (sit-for 0 2)))))
 259
 260 (put 'zone-pgm-whack-chars 'wc-tbl
 261      (let ((tbl (make-string 128 ?x))
 262            (i 0))
 263        (while (< i 128)
 264          (aset tbl i i)
 265          (setq i (1+ i)))
 266        tbl))
 267
 268 ;;;; dissolving
 269
 270 (defun zone-remove-text ()
 271   (let ((working t))
 272     (while working
 273       (setq working nil)
 274       (save-excursion
 275         (goto-char (point-min))
 276         (while (not (eobp))
 277           (if (looking-at "[^(){}\n\t ]")
 278               (let ((n (random 5)))
 279                 (if (not (= n 0))
 280                     (progn
 281                       (setq working t)
 282                       (forward-char 1))
 283                   (delete-char 1)
 284                   (insert " ")))
 285             (forward-char 1))))
 286       (sit-for 0 2))))
 287
 288 (defun zone-pgm-dissolve ()
 289   (zone-remove-text)
 290   (zone-pgm-jitter))
 291
 292
 293 ;;;; exploding
 294
 295 (defun zone-exploding-remove ()
 296   (let ((i 0))
 297     (while (< i 5)
 298       (save-excursion
 299         (goto-char (point-min))
 300         (while (not (eobp))
 301           (if (looking-at "[^*\n\t ]")
 302               (let ((n (random 5)))
 303                 (if (not (= n 0))
 304                     (forward-char 1))
 305                 (insert " ")))
 306           (forward-char 1)))
 307       (setq i (1+ i))
 308       (sit-for 0 2)))
 309   (zone-pgm-jitter))
 310
 311 (defun zone-pgm-explode ()
 312   (zone-exploding-remove)
 313   (zone-pgm-jitter))
 314
 315
 316 ;;;; putzing w/ case
 317
 318 ;; Faster than `zone-pgm-putz-with-case', but not as good: all
 319 ;; instances of the same letter have the same case, which produces a
 320 ;; less interesting effect than you might imagine.
 321 (defun zone-pgm-2nd-putz-with-case ()
 322   (let ((tbl (make-string 128 ?x))
 323         (i 0))
 324     (while (< i 128)
 325       (aset tbl i i)
 326       (setq i (1+ i)))
 327     (while (not (input-pending-p))
 328       (setq i ?a)
 329       (while (<= i ?z)
 330         (aset tbl i
 331               (if (zerop (random 5))
 332                   (upcase i)
 333                 (downcase i)))
 334         (setq i (+ i (1+ (random 5)))))
 335       (setq i ?A)
 336       (while (<= i ?z)
 337         (aset tbl i
 338               (if (zerop (random 5))
 339                   (downcase i)
 340                 (upcase i)))
 341         (setq i (+ i (1+ (random 5)))))
 342       (translate-region (point-min) (point-max) tbl)
 343       (sit-for 0 2))))
 344
 345 (defun zone-pgm-putz-with-case ()
 346   (goto-char (point-min))
 347   (while (not (input-pending-p))
 348     (let ((np (+ 2 (random 5)))
 349           (pm (point-max)))
 350       (while (< np pm)
 351         (goto-char np)
 352         (let ((prec (preceding-char))
 353               (props (text-properties-at (1- (point)))))
 354           (insert (if (zerop (random 2))
 355                       (upcase prec)
 356                     (downcase prec)))
 357           (set-text-properties (1- (point)) (point) props))
 358         (backward-char 2)
 359         (delete-char 1)
 360         (setq np (+ np (1+ (random 5))))))
 361     (goto-char (point-min))
 362     (sit-for 0 2)))
 363
 364
 365 ;;;; rotating
 366
 367 (defun zone-line-specs ()
 368   (let (ret)
 369     (save-excursion
 370       (goto-char (window-start))
 371       (while (< (point) (window-end))
 372         (when (looking-at "[\t ]*\\([^\n]+\\)")
 373           (setq ret (cons (cons (match-beginning 1) (match-end 1)) ret)))
 374         (forward-line 1)))
 375     ret))
 376
 377 (defun zone-pgm-rotate (&optional random-style)
 378   (let* ((specs (apply
 379                  'vector
 380                  (let (res)
 381                    (mapc (lambda (ent)
 382                            (let* ((beg (car ent))
 383                                   (end (cdr ent))
 384                                   (amt (if random-style
 385                                            (funcall random-style)
 386                                          (- (random 7) 3))))
 387                              (when (< (- end (abs amt)) beg)
 388                                (setq amt (random (- end beg))))
 389                              (unless (= 0 amt)
 390                                (setq res
 391                                      (cons
 392                                       (vector amt beg (- end (abs amt)))
 393                                       res)))))
 394                          (zone-line-specs))
 395                    res)))
 396          (n (length specs))
 397          amt aamt cut paste txt i ent)
 398     (while (not (input-pending-p))
 399       (setq i 0)
 400       (while (< i n)
 401         (setq ent (aref specs i))
 402         (setq amt (aref ent 0) aamt (abs amt))
 403         (if (> 0 amt)
 404             (setq cut 1 paste 2)
 405           (setq cut 2 paste 1))
 406         (goto-char (aref ent cut))
 407         (setq txt (buffer-substring (point) (+ (point) aamt)))
 408         (delete-char aamt)
 409         (goto-char (aref ent paste))
 410         (insert txt)
 411         (setq i (1+ i)))
 412       (sit-for 0.04))))
 413
 414 (defun zone-pgm-rotate-LR-lockstep ()
 415   (zone-pgm-rotate (lambda () 1)))
 416
 417 (defun zone-pgm-rotate-RL-lockstep ()
 418   (zone-pgm-rotate (lambda () -1)))
 419
 420 (defun zone-pgm-rotate-LR-variable ()
 421   (zone-pgm-rotate (lambda () (1+ (random 3)))))
 422
 423 (defun zone-pgm-rotate-RL-variable ()
 424   (zone-pgm-rotate (lambda () (1- (- (random 3))))))
 425
 426
 427 ;;;; dripping
 428
 429 (defsubst zone-cpos (pos)
 430   (buffer-substring pos (1+ pos)))
 431
 432 (defsubst zone-replace-char (count del-count char-as-string new-value)
 433   (delete-char (or del-count (- count)))
 434   (aset char-as-string 0 new-value)
 435   (dotimes (i count) (insert char-as-string)))
 436
 437 (defsubst zone-park/sit-for (pos seconds)
 438   (let ((p (point)))
 439     (goto-char pos)
 440     (prog1 (sit-for seconds)
 441       (goto-char p))))
 442
 443 (defun zone-fret (wbeg pos)
 444   (let* ((case-fold-search nil)
 445          (c-string (zone-cpos pos))
 446          (cw-ceil (ceiling (char-width (aref c-string 0))))
 447          (hmm (cond
 448                ((string-match "[a-z]" c-string) (upcase c-string))
 449                ((string-match "[A-Z]" c-string) (downcase c-string))
 450                (t (propertize " " 'display `(space :width ,cw-ceil))))))
 451     (do ((i 0 (1+ i))
 452          (wait 0.5 (* wait 0.8)))
 453         ((= i 20))
 454       (goto-char pos)
 455       (delete-char 1)
 456       (insert (if (= 0 (% i 2)) hmm c-string))
 457       (zone-park/sit-for wbeg wait))
 458     (delete-char -1) (insert c-string)))
 459
 460 (defun zone-fill-out-screen (width height)
 461   (let ((start (window-start))
 462         (line (make-string width 32)))
 463     (goto-char start)
 464     ;; fill out rectangular ws block
 465     (while (progn (end-of-line)
 466                   (let ((cc (current-column)))
 467                     (if (< cc width)
 468                         (insert (substring line cc))
 469                       (delete-char (- width cc)))
 470                     (cond ((eobp) (insert "\n") nil)
 471                           (t (forward-char 1) t)))))
 472     ;; pad ws past bottom of screen
 473     (let ((nl (- height (count-lines (point-min) (point)))))
 474       (when (> nl 0)
 475         (setq line (concat line "\n"))
 476         (do ((i 0 (1+ i)))
 477             ((= i nl))
 478           (insert line))))
 479     (goto-char start)
 480     (recenter 0)
 481     (sit-for 0)))
 482
 483 (defun zone-fall-through-ws (c wbeg wend)
 484   (let* ((cw-ceil (ceiling (char-width (aref c 0))))
 485          (spaces (make-string cw-ceil 32))
 486          (col (current-column))
 487          (wait 0.15)
 488          newpos fall-p)
 489     (while (when (save-excursion
 490                    (forward-line 1)
 491                    (and (= col (current-column))
 492                         (setq newpos (point))
 493                         (string= spaces (buffer-substring-no-properties
 494                                          newpos (+ newpos cw-ceil)))
 495                         (setq newpos (+ newpos (1- cw-ceil)))))
 496              (setq fall-p t)
 497              (delete-char 1)
 498              (insert spaces)
 499              (goto-char newpos)
 500              (when (< (point) wend)
 501                (delete-char cw-ceil)
 502                (insert c)
 503                (forward-char -1)
 504                (zone-park/sit-for wbeg (setq wait (* wait 0.8))))))
 505     fall-p))
 506
 507 (defun zone-pgm-drip (&optional fret-p pancake-p)
 508   (let* ((ww (1- (window-width)))
 509          (wh (window-height))
 510          (mc 0)                         ; miss count
 511          (total (* ww wh))
 512          (fall-p nil)
 513          wbeg wend c)
 514     (zone-fill-out-screen ww wh)
 515     (setq wbeg (window-start)
 516           wend (window-end))
 517     (catch 'done
 518       (while (not (input-pending-p))
 519         (setq mc 0 wend (window-end))
 520         ;; select non-ws character, but don't miss too much
 521         (goto-char (+ wbeg (random (- wend wbeg))))
 522         (while (looking-at "[ \n\f]")
 523           (if (= total (setq mc (1+ mc)))
 524               (throw 'done 'sel)
 525             (goto-char (+ wbeg (random (- wend wbeg))))))
 526         ;; character animation sequence
 527         (let ((p (point)))
 528           (when fret-p (zone-fret wbeg p))
 529           (goto-char p)
 530           (setq c (zone-cpos p)
 531                 fall-p (zone-fall-through-ws c wbeg wend)))
 532         ;; assuming current-column has not changed...
 533         (when (and pancake-p
 534                    fall-p
 535                    (< (count-lines (point-min) (point))
 536                       wh))
 537           (let ((cw (ceiling (char-width (aref c 0)))))
 538             (zone-replace-char cw   1 c ?@) (zone-park/sit-for wbeg 0.137)
 539             (zone-replace-char cw nil c ?*) (zone-park/sit-for wbeg 0.137)
 540             (zone-replace-char cw nil c ?_)))))))
 541
 542 (defun zone-pgm-drip-fretfully ()
 543   (zone-pgm-drip t))
 544
 545 (defun zone-pgm-five-oclock-swan-dive ()
 546   (zone-pgm-drip nil t))
 547
 548 (defun zone-pgm-martini-swan-dive ()
 549   (zone-pgm-drip t t))
 550
 551 (defun zone-pgm-rat-race ()
 552   (while (not (input-pending-p))
 553     (zone-call '((zone-pgm-rotate 10)
 554                  (zone-pgm-drip-fretfully 15)
 555                  (zone-pgm-drip 10)
 556                  ((lambda ()
 557                     (goto-char (point-min))
 558                     (while (re-search-forward " +$" nil t)
 559                       (delete-region (match-beginning 0) (match-end 0))))
 560                   5)))))
 561
 562
 563 ;;;; paragraph spazzing (for textish modes)
 564
 565 (defun zone-pgm-paragraph-spaz ()
 566   (if (memq (zone-orig major-mode)
 567             ;; there should be a better way to distinguish textish modes
 568             '(text-mode texinfo-mode fundamental-mode))
 569       (let ((fill-column fill-column)
 570             (fc-min fill-column)
 571             (fc-max fill-column)
 572             (max-fc (1- (frame-width))))
 573         (while (sit-for 0.1)
 574           (fill-paragraph 1)
 575           (setq fill-column (+ fill-column (- (random 5) 2)))
 576           (when (< fill-column fc-min)
 577             (setq fc-min fill-column))
 578           (when (> fill-column max-fc)
 579             (setq fill-column max-fc))
 580           (when (> fill-column fc-max)
 581             (setq fc-max fill-column))))
 582     (message "Zoning... (zone-pgm-rotate)")
 583     (zone-pgm-rotate)))
 584
 585
 586 ;;;; stressing and destressing
 587
 588 (defun zone-pgm-stress ()
 589   (goto-char (point-min))
 590   (let (lines)
 591     (while (< (point) (point-max))
 592       (let ((p (point)))
 593         (forward-line 1)
 594         (setq lines (cons (buffer-substring p (point)) lines))))
 595     (sit-for 5)
 596     (zone-hiding-modeline
 597      (let ((msg "Zoning... (zone-pgm-stress)"))
 598        (while (not (string= msg ""))
 599          (message (setq msg (substring msg 1)))
 600          (sit-for 0.05)))
 601      (while (not (input-pending-p))
 602        (when (< 50 (random 100))
 603          (goto-char (point-max))
 604          (forward-line -1)
 605          (let ((kill-whole-line t))
 606            (kill-line))
 607          (goto-char (point-min))
 608          (insert (nth (random (length lines)) lines)))
 609        (message (concat (make-string (random (- (frame-width) 5)) ? ) "grrr"))
 610        (sit-for 0.1)))))
 611
 612 (defun zone-pgm-stress-destress ()
 613   (zone-call 'zone-pgm-stress 25)
 614   (zone-hiding-modeline
 615    (sit-for 3)
 616    (erase-buffer)
 617    (sit-for 3)
 618    (insert-buffer-substring "*Messages*")
 619    (message "")
 620    (goto-char (point-max))
 621    (recenter -1)
 622    (sit-for 3)
 623    (delete-region (point-min) (window-start))
 624    (message "hey why stress out anyway?")
 625    (zone-call '((zone-pgm-rotate         30)
 626                 (zone-pgm-whack-chars    10)
 627                 zone-pgm-drip))))
 628
 629
 630 ;;;; the lyfe so short the craft so long to lerne --chaucer
 631
 632 (defvar zone-pgm-random-life-wait nil
 633   "*Seconds to wait between successive `life' generations.
 634 If nil, `zone-pgm-random-life' chooses a value from 0-3 (inclusive).")
 635
 636 (defun zone-pgm-random-life ()
 637   (require 'life)
 638   (zone-fill-out-screen (1- (window-width)) (1- (window-height)))
 639   (let ((top (progn (goto-char (window-start)) (forward-line 7) (point)))
 640         (bot (progn (goto-char (window-end)) (forward-line -7) (point)))
 641         (rtc (- (frame-width) 11))
 642         (min (window-start))
 643         (max (1- (window-end)))
 644         s c col)
 645     (delete-region max (point-max))
 646     (while (and (progn (goto-char min) (sit-for 0.05))
 647                 (progn (goto-char (+ min (random max)))
 648                        (or (progn (skip-chars-forward " @\n" max)
 649                                   (not (= max (point))))
 650                            (unless (or (= 0 (skip-chars-backward " @\n" min))
 651                                        (= min (point)))
 652                              (forward-char -1)
 653                              t))))
 654       (unless (or (eolp) (eobp))
 655         (setq s (zone-cpos (point))
 656               c (aref s 0))
 657         (zone-replace-char
 658          (char-width c)
 659          1 s (cond ((or (> top (point))
 660                         (< bot (point))
 661                         (or (> 11 (setq col (current-column)))
 662                             (< rtc col)))
 663                     32)
 664                    ((and (<= ?a c) (>= ?z c)) (+ c (- ?A ?a)))
 665                    ((and (<= ?A c) (>= ?Z c)) ?*)
 666                    (t ?@)))))
 667     (sit-for 3)
 668     (setq col nil)
 669     (goto-char bot)
 670     (while (< top (point))
 671       (setq c (point))
 672       (move-to-column 9)
 673       (setq col (cons (buffer-substring (point) c) col))
 674       (end-of-line 0)
 675       (forward-char -10))
 676     (let ((life-patterns (vector
 677                           (if (and col (search-forward "@" max t))
 678                               (cons (make-string (length (car col)) 32) col)
 679                             (list (mapconcat 'identity
 680                                              (make-list (/ (- rtc 11) 15)
 681                                                         (make-string 5 ?@))
 682                                              (make-string 10 32)))))))
 683       (life (or zone-pgm-random-life-wait (random 4)))
 684       (kill-buffer nil))))
 685
 686
 687 (random t)
 688
 689 ;;;;;;;;;;;;;;;
 690 (provide 'zone)
 691
 692 ;; arch-tag: 7092503d-74a9-4325-a55c-a026ede58cea
 693 ;;; zone.el ends here