├── LICENSE
├── README.md
├── doc
├── GameOfLifeDemo.gif
└── gameoflife-screenshot-setup.el
├── examples
├── box.txt
├── figure-eight.txt
├── glider.txt
├── hertz.txt
├── long-lines.txt
├── penta.txt
└── star.txt
└── gameoflife.el
/LICENSE:
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577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 |
635 | Copyright (C)
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | Copyright (C)
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # gameoflife - Screensaver running Conway's Game of Life
2 |
3 | *Author:* Anders Lindgren
4 | *Version:* 0.0.3
5 | *URL:* [https://github.com/Lindydancer/gameoflife](https://github.com/Lindydancer/gameoflife)
6 |
7 | Run Conway's Game of Life, in all windows, using the original
8 | window content as seed. In addition, when performing the
9 | animation, the original characters and the colors they have, are
10 | retained, resulting is a much more living result than when simply
11 | using, say, stars.
12 |
13 | By "seed", it means that the original content of the windows are
14 | seen as dots in the plane. All non-blank characters are seen as
15 | live dots.
16 |
17 | The Game of Life animation can be started as a screensaver, so that
18 | it starts automatically when Emacs has been idle for a while. By
19 | default, it stops after 1000 generations.
20 |
21 | ### Screenshot
22 |
23 | 
24 |
25 | ## Usage
26 |
27 | `gameoflife-animate` -- Start the Game of Life animation.
28 |
29 | `gameoflife-screensaver-mode` -- Run as a screensaver. The
30 | animation is started when Emacs has been idle for a while.
31 |
32 | ## About Conway's Game of Life
33 |
34 | Conway's Game of Life is a simple simulation, originally developed
35 | in 1970, taking place in a two-dimentional grid -- think of it as
36 | an infinite chess board.
37 |
38 | A square can either be dead or alive. In each step in the
39 | simulation, the following rule applies:
40 |
41 | - A live square stays alive only if it has two or three neighbours.
42 | - A dead square is resurrected if it has exactly three neighburs.
43 |
44 | ## Personal reflection
45 |
46 | I have noticed that sparse programming languages with a lot of
47 | highlighting, like C and C++, produde the most beautiful
48 | animations. More dense programming languages, like elisp, tend to
49 | "kill" many squares in the first generation, making them less
50 | suited for Game of Life seeds.
51 |
52 |
53 | ---
54 | Converted from `gameoflife.el` by [*el2markdown*](https://github.com/Lindydancer/el2markdown).
55 |
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/doc/GameOfLifeDemo.gif:
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https://raw.githubusercontent.com/Lindydancer/gameoflife/5f4ac265928bfd88765d057b44cebcef71a7aaf6/doc/GameOfLifeDemo.gif
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/doc/gameoflife-screenshot-setup.el:
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1 | ;;; gameoflife-screenshot-setup.el --- Setup gameoflife screenshot -*- lexical-binding: t; -*-
2 |
3 | ;; Copyright (C) 2020 Anders Lindgren
4 |
5 | ;; Author: Anders Lindgren
6 |
7 | ;; This program is free software; you can redistribute it and/or modify
8 | ;; it under the terms of the GNU General Public License as published by
9 | ;; the Free Software Foundation, either version 3 of the License, or
10 | ;; (at your option) any later version.
11 |
12 | ;; This program is distributed in the hope that it will be useful,
13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 | ;; GNU General Public License for more details.
16 |
17 | ;; You should have received a copy of the GNU General Public License
18 | ;; along with this program. If not, see .
19 |
20 | ;;; Commentary:
21 |
22 | ;; Usage:
23 | ;;
24 | ;; emacs -q -l gameoflife-screenshot-setup.el
25 | ;;
26 | ;; Start "linecap" (or any other screen grabbing utility), and
27 | ;; resize it to match the Emacs frame.
28 | ;;
29 | ;; Start the screengrabbing and press RET in Emacs.
30 |
31 | ;;; Code:
32 |
33 | (setq inhibit-startup-screen t)
34 |
35 | (blink-cursor-mode -1)
36 |
37 | (defvar gameoflife-screenshot-dir
38 | (or (and load-file-name
39 | (file-name-directory load-file-name))
40 | default-directory))
41 |
42 | (set-frame-size (selected-frame) 80 30)
43 |
44 | (load (concat gameoflife-screenshot-dir
45 | "../gameoflife.el"))
46 | (find-file (concat gameoflife-screenshot-dir "../gameoflife.el"))
47 | (re-search-forward "(defun gameoflife-animate" nil)
48 | (forward-line -3)
49 | (set-window-start (selected-window) (point))
50 |
51 | (provide 'gameoflife-screenshot-setup)
52 |
53 | (setq unread-command-events
54 | (listify-key-sequence (kbd "M-x gameoflife-animate")))
55 |
56 | ;;; gameoflife-screenshot-setup.el ends here
57 |
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/examples/box.txt:
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1 |
2 |
3 | xx
4 | xx
5 |
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/examples/figure-eight.txt:
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1 |
2 |
3 | xxx
4 | xxx
5 | xxx
6 | xxx
7 | xxx
8 | xxx
9 |
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/examples/glider.txt:
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1 | x
2 | x
3 | xxx
4 |
5 |
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/examples/hertz.txt:
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1 |
2 |
3 |
4 | x
5 | x x
6 | x x x
7 | x x
8 | xxx
9 |
10 | xxx
11 | xx x x x
12 | xx x x
13 | x x xx
14 | x x xx
15 | xxx
16 |
17 | xxx
18 | x x
19 | x x x
20 | x x
21 | x
22 |
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/examples/long-lines.txt:
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1 |
2 |
3 | xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx
4 | xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx
5 |
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/examples/penta.txt:
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1 |
2 |
3 |
4 |
5 | xxxxxxxxxx
6 |
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/examples/star.txt:
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1 |
2 |
3 |
4 | 1
5 | 111
6 | 11111
7 | 2 2
8 | 22 22
9 | 222 222
10 | 22 22
11 | 2 2
12 | 33333
13 | 333
14 | 3
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 | 1
23 | 111
24 | 11111
25 | 2 2
26 | 22 22
27 | 222 x 222
28 | 22 22
29 | 2 2
30 | 33333
31 | 333
32 | 3
33 |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 | 1
42 | 111
43 | 11111
44 | 2 2
45 | 22 22
46 | 222 x x 222
47 | 22 22
48 | 2 2
49 | 33333
50 | 333
51 | 3
52 |
53 |
54 |
55 |
56 |
57 |
58 | 1
59 | 111
60 | 11111
61 | 2 2
62 | 22 x 22
63 | 222 x x 222
64 | 22 x 22
65 | 2 2
66 | 33333
67 | 333
68 | 3
69 |
70 |
71 |
72 |
73 |
74 |
75 | 1
76 | 111
77 | 11111
78 | 2 2
79 | 22 x 22
80 | 222 xxx 222
81 | 22 x 22
82 | 2 2
83 | 33333
84 | 333
85 | 3
86 |
87 |
88 |
89 |
90 |
91 |
92 | 1
93 | 111
94 | 11111
95 | 2 2
96 | 22 xxx 22
97 | 222 xxx 222
98 | 22 xxx 22
99 | 2 2
100 | 33333
101 | 333
102 | 3
103 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
112 | 1
113 | 111
114 | 11111
115 | 2 2
116 | 22 x x 22
117 | 222 222
118 | 22 x x 22
119 | 2 2
120 | 33333
121 | 333
122 | 3
123 |
124 |
125 |
126 |
127 |
128 |
--------------------------------------------------------------------------------
/gameoflife.el:
--------------------------------------------------------------------------------
1 | ;;; gameoflife.el --- Screensaver running Conway's Game of Life. -*- lexical-binding: t; -*-
2 |
3 | ;; Copyright (C) 2017,2020,2024,2025 Anders Lindgren
4 |
5 | ;; Author: Anders Lindgren
6 | ;; Keywords: games
7 | ;; Version: 0.0.3
8 | ;; Created: 2017-11-15
9 | ;; URL: https://github.com/Lindydancer/gameoflife
10 |
11 | ;; This program is free software; you can redistribute it and/or modify
12 | ;; it under the terms of the GNU General Public License as published by
13 | ;; the Free Software Foundation, either version 3 of the License, or
14 | ;; (at your option) any later version.
15 |
16 | ;; This program is distributed in the hope that it will be useful,
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 | ;; GNU General Public License for more details.
20 |
21 | ;; You should have received a copy of the GNU General Public License
22 | ;; along with this program. If not, see .
23 |
24 | ;;; Commentary:
25 |
26 | ;; Run Conway's Game of Life, in all windows, using the original
27 | ;; window content as seed. In addition, when performing the
28 | ;; animation, the original characters and the colors they have, are
29 | ;; retained, resulting is a much more living result than when simply
30 | ;; using, say, stars.
31 | ;;
32 | ;; By "seed", it means that the original content of the windows are
33 | ;; seen as dots in the plane. All non-blank characters are seen as
34 | ;; live dots.
35 | ;;
36 | ;; The Game of Life animation can be started as a screensaver, so that
37 | ;; it starts automatically when Emacs has been idle for a while. By
38 | ;; default, it stops after 1000 generations.
39 | ;;
40 | ;; Screenshot:
41 | ;;
42 | ;; 
43 |
44 | ;; Usage:
45 | ;;
46 | ;; `gameoflife-animate' -- Start the Game of Life animation.
47 | ;;
48 | ;; `gameoflife-screensaver-mode' -- Run as a screensaver. The
49 | ;; animation is started when Emacs has been idle for a while.
50 |
51 | ;; About Conway's Game of Life:
52 | ;;
53 | ;; Conway's Game of Life is a simple simulation, originally developed
54 | ;; in 1970, taking place in a two-dimentional grid -- think of it as
55 | ;; an infinite chess board.
56 | ;;
57 | ;; A square can either be dead or alive. In each step in the
58 | ;; simulation, the following rule applies:
59 | ;;
60 | ;; - A live square stays alive only if it has two or three neighbours.
61 | ;;
62 | ;; - A dead square is resurrected if it has exactly three neighburs.
63 |
64 | ;; Personal reflection:
65 | ;;
66 | ;; I have noticed that sparse programming languages with a lot of
67 | ;; highlighting, like C and C++, produde the most beautiful
68 | ;; animations. More dense programming languages, like elisp, tend to
69 | ;; "kill" many squares in the first generation, making them less
70 | ;; suited for Game of Life seeds.
71 |
72 | ;;; Code:
73 |
74 | (defvar gameoflife-animation-speed 0.25
75 | "The delay, in seconds, between gameoflife generations when animating.")
76 |
77 |
78 | (defun gameoflife-nonspace-points-on-line ()
79 | "Return list of non-space points on line.
80 |
81 | Each entry corresponds to a column, with an extra fictitious
82 | column to left. Each entry is the position of the character or
83 | nil for spaces and tabs.
84 |
85 | Example:
86 |
87 | ' xy' => (nil nil 2 nil nil nil nil nil nil 4)"
88 | (save-excursion
89 | (let ((res '()))
90 | (while (not (eolp))
91 | (let ((ch (char-after)))
92 | (cond ((eq ch ?\s)
93 | (forward-char)
94 | (push nil res))
95 | ((eq ch ?\t)
96 | (let ((column (current-column)))
97 | (forward-char)
98 | (while (< column (current-column))
99 | (setq column (+ column 1))
100 | (push nil res))))
101 | (t
102 | (push (point) res)
103 | (forward-char)))))
104 | ;; Drop spaces at the end of the line.
105 | (while (and res
106 | (null (nth 0 res)))
107 | (pop res))
108 | ;; Add an extra entry to represent a space in a fictitious
109 | ;; column to the left of the first column.
110 | (cons nil (nreverse res)))))
111 |
112 |
113 | (defun gameoflife-nonspace-points-on-next-line ()
114 | "Return list of non-space points on next line.
115 |
116 | See `gameoflife-nonspace-points-on-line' for details."
117 | (save-excursion
118 | (forward-line)
119 | (if (eobp)
120 | '()
121 | (gameoflife-nonspace-points-on-line))))
122 |
123 |
124 | (defun gameoflife-buffer (&optional from to tmpbuf)
125 | "Convert current buffer to next game of life generation into TMPBUF.
126 |
127 | Convert from FROM to TO. When FROM and TO are nil use the start
128 | and end of the buffer, respectively.
129 |
130 | Return generated buffer."
131 | (interactive)
132 | (unless tmpbuf
133 | (setq tmpbuf (get-buffer-create "*GameOfLifeTemp*")))
134 | (unless from
135 | (setq from (point-min)))
136 | (unless to
137 | (setq to (point-max)))
138 | (with-current-buffer tmpbuf
139 | (set (make-local-variable 'truncate-lines) t)
140 | (setq cursor-type nil)
141 | (erase-buffer))
142 | (save-excursion
143 | (goto-char from)
144 | (beginning-of-line)
145 | (let ((prev-line '())
146 | (curr-line (gameoflife-nonspace-points-on-line))
147 | (next-line (gameoflife-nonspace-points-on-next-line)))
148 | (while
149 | (progn
150 | ;; Loop over the element on each line.
151 | (let ((rest-prev-line prev-line)
152 | (rest-curr-line curr-line)
153 | (rest-next-line next-line))
154 | (while (or rest-prev-line
155 | rest-curr-line
156 | rest-next-line)
157 | ;; Point or nil for LINE-COLUMN
158 | (let ((pp (nth 0 rest-prev-line))
159 | (cp (nth 0 rest-curr-line))
160 | (np (nth 0 rest-next-line))
161 | (pc (nth 1 rest-prev-line))
162 | (cc (nth 1 rest-curr-line))
163 | (nc (nth 1 rest-next-line))
164 | (pn (nth 2 rest-prev-line))
165 | (cn (nth 2 rest-curr-line))
166 | (nn (nth 2 rest-next-line)))
167 | (let ((neighbours (+ (if pp 1 0)
168 | (if cp 1 0)
169 | (if np 1 0)
170 | (if pc 1 0)
171 | ;; Current cell (cc) isn't a neighbour.
172 | (if nc 1 0)
173 | (if pn 1 0)
174 | (if cn 1 0)
175 | (if nn 1 0))))
176 | (let ((str
177 | (cond ((and cc
178 | (or (eq neighbours 2)
179 | (eq neighbours 3)))
180 | ;; The cell remains alive.
181 | (buffer-substring cc (+ cc 1)))
182 | ((eq neighbours 3)
183 | ;; A new cell is born. Copy a character
184 | ;; from one of the neighbours.
185 | (let ((p (or pp pc pn
186 | cp cn
187 | np nc nn)))
188 | (buffer-substring p (+ p 1))))
189 | (t
190 | " "))))
191 | (with-current-buffer tmpbuf
192 | (insert str)))))
193 | (pop rest-prev-line)
194 | (pop rest-curr-line)
195 | (pop rest-next-line)))
196 | ;; End of line.
197 | (with-current-buffer tmpbuf
198 | (skip-chars-backward " ")
199 | (delete-region (point) (line-end-position))
200 | (insert "\n"))
201 | (prog1
202 | ;; Condition of terminate outer loop.
203 | ;;
204 | ;; The generated output is one line longer than TO,
205 | ;; since new cells can be born below the last line.
206 | (< (point) to)
207 | ;; Prepare for the next line.
208 | (forward-line)
209 | (setq prev-line curr-line)
210 | (setq curr-line next-line)
211 | (setq next-line (gameoflife-nonspace-points-on-next-line)))))))
212 | ;; Trim empty lines from end of buffer.
213 | (with-current-buffer tmpbuf
214 | (while (and (not (bobp))
215 | (progn
216 | (backward-char)
217 | (bolp)))
218 | (delete-char 1))
219 | (goto-char (point-min)))
220 | tmpbuf)
221 |
222 |
223 | (defvar gameoflife-cached-buffers '())
224 |
225 |
226 | (defun gameoflife-window (&optional win)
227 | "Display the next Game of Life anmation in WIN.
228 |
229 | When WIN is nil, use the selected window."
230 | (interactive)
231 | (unless win
232 | (setq win (selected-window)))
233 | ;; Find a suitable gameoflife buffer. This will replace the buffer
234 | ;; displayed in WIN.
235 | (let ((buf nil))
236 | (let ((rest gameoflife-cached-buffers))
237 | (while rest
238 | (if (or (not (buffer-live-p (car rest)))
239 | (get-buffer-window (car rest) t))
240 | (setq rest (cdr rest))
241 | (setq buf (car rest))
242 | (setq rest nil))))
243 | ;; Last resort. Allocate a new.
244 | (unless buf
245 | (setq buf (generate-new-buffer "*GameOfLife*"))
246 | (push buf gameoflife-cached-buffers))
247 | ;; --------------------
248 | (with-current-buffer (window-buffer win)
249 | ;; Note: Not using `window-end' since the resulting buffer
250 | ;; doesn't contain wrapped lines, whereas the source buffer may.
251 | (let ((end (save-excursion
252 | (goto-char (window-start win))
253 | (forward-line (window-height win))
254 | (point))))
255 | (set-window-buffer win
256 | (gameoflife-buffer (window-start win) end buf))
257 | (set-window-start win (with-current-buffer buf
258 | (point-min)))))))
259 |
260 |
261 | (defun gameoflife-all-windows ()
262 | "Step forward one generation in Game of Life in all windows."
263 | (let* ((orig-win (selected-window))
264 | (first-win (next-window nil 'not-minibuf t))
265 | (win first-win))
266 | (while (progn
267 | (save-excursion
268 | (unless (window-dedicated-p win)
269 | (select-window win)
270 | (gameoflife-window win)))
271 | (setq win (next-window win 'not-minibuf t))
272 | (not (eq win first-win))))
273 | (select-window orig-win)))
274 |
275 |
276 | ;;;###autoload
277 | (defun gameoflife-animate (&optional count)
278 | "Animate Conway's Game of Life in all windows in all frames.
279 |
280 | COUNT determines the number of generations to run. When omitted,
281 | the animation runs for ever.
282 |
283 | When a user input is available, this function returns.
284 |
285 | The content of the windows of the frame are used as the seed of
286 | the animation."
287 | (interactive)
288 | ;; Note: This is like `save-window-configuration' for all frames.
289 | (let ((orig-frame (selected-frame))
290 | (window-configurations '()))
291 | (let ((frame orig-frame))
292 | (while (progn
293 | (push (cons frame (current-window-configuration frame))
294 | window-configurations)
295 | (setq frame (next-frame frame))
296 | (not (eq frame orig-frame))))
297 | (unwind-protect
298 | (let ((win (selected-window))
299 | (generation 0))
300 | (while (and (not (input-pending-p))
301 | (or (null count)
302 | (< generation count)))
303 | (with-current-buffer (window-buffer win)
304 | (gameoflife-all-windows)
305 | (message "Generation %d" generation)
306 | (setq generation (+ generation 1))
307 | (sit-for gameoflife-animation-speed)))
308 | ;; When a count was given, stop and show the last
309 | ;; generation.
310 | (when count
311 | (sit-for most-positive-fixnum)))
312 | (dolist (pair window-configurations)
313 | (select-frame (car pair))
314 | (set-window-configuration (cdr pair)))
315 | (select-frame orig-frame)))))
316 |
317 |
318 | ;; -------------------------------------------------------------------
319 | ;; Screensaver
320 | ;;
321 |
322 | (defvar gameoflife-screensaver-timer nil)
323 |
324 | (defvar gameoflife-screensaver-generations 1000)
325 |
326 | (defvar gameoflife-screensaver-timeout 60
327 | "The time, in seconds, before Gameoflife Screensaver Mode starts.")
328 |
329 | (defun gameoflife-animate-with-limit ()
330 | "Run `gameoflife-animate' a limited number of generations.
331 |
332 | The variable `gameoflife-screensaver-generations' controls the
333 | number of generations to run."
334 | (interactive)
335 | (gameoflife-animate gameoflife-screensaver-generations))
336 |
337 | ;;;###autoload
338 | (define-minor-mode gameoflife-screensaver-mode
339 | "Run Conway's Game of Life when Emacs has been idle for a while."
340 | :global t
341 | (when (timerp gameoflife-screensaver-timer)
342 | (cancel-timer gameoflife-screensaver-timer))
343 | (setq gameoflife-screensaver-timer nil)
344 | (when gameoflife-screensaver-mode
345 | (setq gameoflife-screensaver-timer
346 | (run-with-idle-timer gameoflife-screensaver-timeout t
347 | #'gameoflife-animate-with-limit))))
348 |
349 | (provide 'gameoflife)
350 |
351 | ;;; gameoflife.el ends here
352 |
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