lisp/play/gamegrid.el

   1 ;;; gamegrid.el --- library for implementing grid-based games on Emacs
   2
   3 ;; Copyright (C) 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   4 ;;   2008  Free Software Foundation, Inc.
   5
   6 ;; Author: Glynn Clements <glynn@sensei.co.uk>
   7 ;; Version: 1.02
   8 ;; Created: 1997-08-13
   9 ;; Keywords: games
  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 ;;; Code:
  29
  30 (eval-when-compile
  31   (require 'cl))
  32
  33 ;; ;;;;;;;;;;;;; buffer-local variables ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  34
  35 (defvar gamegrid-use-glyphs t
  36   "Non-nil means use glyphs when available.")
  37
  38 (defvar gamegrid-use-color t
  39   "Non-nil means use color when available.")
  40
  41 (defvar gamegrid-font "-*-courier-medium-r-*-*-*-140-100-75-*-*-iso8859-*"
  42   "Name of the font used in X mode.")
  43
  44 (defvar gamegrid-face nil
  45   "Indicates the face to use as a default.")
  46 (make-variable-buffer-local 'gamegrid-face)
  47
  48 (defvar gamegrid-display-options nil)
  49
  50 (defvar gamegrid-buffer-width 0)
  51 (defvar gamegrid-buffer-height 0)
  52 (defvar gamegrid-blank 0)
  53
  54 (defvar gamegrid-timer nil)
  55
  56 (defvar gamegrid-display-mode nil)
  57
  58 (defvar gamegrid-display-table)
  59
  60 (defvar gamegrid-face-table nil)
  61
  62 (defvar gamegrid-buffer-start 1)
  63
  64 (defvar gamegrid-score-file-length 50
  65   "Number of high scores to keep")
  66
  67 (defvar gamegrid-user-score-file-directory
  68   (locate-user-emacs-file "games/")
  69   "A directory for game scores which can't be shared.
  70 If Emacs was built without support for shared game scores, then this
  71 directory will be used.")
  72
  73 (make-variable-buffer-local 'gamegrid-use-glyphs)
  74 (make-variable-buffer-local 'gamegrid-use-color)
  75 (make-variable-buffer-local 'gamegrid-font)
  76 (make-variable-buffer-local 'gamegrid-display-options)
  77 (make-variable-buffer-local 'gamegrid-buffer-width)
  78 (make-variable-buffer-local 'gamegrid-buffer-height)
  79 (make-variable-buffer-local 'gamegrid-blank)
  80 (make-variable-buffer-local 'gamegrid-timer)
  81 (make-variable-buffer-local 'gamegrid-display-mode)
  82 (make-variable-buffer-local 'gamegrid-display-table)
  83 (make-variable-buffer-local 'gamegrid-face-table)
  84 (make-variable-buffer-local 'gamegrid-buffer-start)
  85 (make-variable-buffer-local 'gamegrid-score-file-length)
  86
  87 ;; ;;;;;;;;;;;;; global variables ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  88
  89 (defvar gamegrid-grid-x-face nil)
  90 (defvar gamegrid-mono-x-face nil)
  91 (defvar gamegrid-mono-tty-face nil)
  92
  93 ;; ;;;;;;;;;;;;; constants ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  94
  95 (defconst gamegrid-glyph-height 16)
  96
  97 (defconst gamegrid-xpm "\
  98 /* XPM */
  99 static char *noname[] = {
 100 /* width height ncolors chars_per_pixel */
 101 \"16 16 3 1\",
 102 /* colors */
 103 \"+ s col1\",
 104 \". s col2\",
 105 \"- s col3\",
 106 /* pixels */
 107 \"---------------+\",
 108 \"--------------++\",
 109 \"--............++\",
 110 \"--............++\",
 111 \"--............++\",
 112 \"--............++\",
 113 \"--............++\",
 114 \"--............++\",
 115 \"--............++\",
 116 \"--............++\",
 117 \"--............++\",
 118 \"--............++\",
 119 \"--............++\",
 120 \"--............++\",
 121 \"-+++++++++++++++\",
 122 \"++++++++++++++++\"
 123 };
 124 "
 125   "XPM format image used for each square")
 126
 127 (defvar gamegrid-xbm "\
 128 /* gamegrid XBM */
 129 #define gamegrid_width 16
 130 #define gamegrid_height 16
 131 static unsigned char gamegrid_bits[] = {
 132    0xff, 0xff, 0xff, 0x7f, 0xff, 0x3f, 0xaf, 0x0a, 0x57, 0x15, 0xaf, 0x0a,
 133    0x57, 0x15, 0xaf, 0x0a, 0x57, 0x15, 0xaf, 0x0a, 0x57, 0x15, 0xaf, 0x0a,
 134    0x57, 0x15, 0x07, 0x00, 0x03, 0x00, 0x01, 0x00 };"
 135   "XBM format image used for each square.")
 136
 137 ;; ;;;;;;;;;;;;;;;; miscellaneous functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 138
 139 (defsubst gamegrid-characterp (arg)
 140   (if (fboundp 'characterp)
 141       (characterp arg)
 142     (integerp arg)))
 143
 144 (defsubst gamegrid-event-x (event)
 145   (if (fboundp 'event-x)
 146       (event-x event)
 147     (car (posn-col-row (event-end event)))))
 148
 149 (defsubst gamegrid-event-y (event)
 150   (if (fboundp 'event-y)
 151       (event-y event)
 152     (cdr (posn-col-row (event-end event)))))
 153
 154 ;; ;;;;;;;;;;;;; display functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 155
 156 (defun gamegrid-color (color shade)
 157   (let* ((v (floor (* shade 255)))
 158          (r (* v (aref color 0)))
 159          (g (* v (aref color 1)))
 160          (b (* v (aref color 2))))
 161     (format "#%02x%02x%02x" r g b)))
 162
 163 (defun gamegrid-set-font (face)
 164   (if gamegrid-font
 165       (condition-case nil
 166           (set-face-font face gamegrid-font)
 167         (error nil))))
 168
 169 (defun gamegrid-setup-face (face color)
 170   (set-face-foreground face color)
 171   (set-face-background face color)
 172   (gamegrid-set-font face)
 173   (condition-case nil
 174       (set-face-background-pixmap face [nothing]);; XEmacs
 175     (error nil))
 176   (condition-case nil
 177       (set-face-background-pixmap face nil);; Emacs
 178     (error nil)))
 179
 180 (defun gamegrid-make-mono-tty-face ()
 181   (let ((face (make-face 'gamegrid-mono-tty-face)))
 182     (set-face-inverse-video-p face t)
 183     face))
 184
 185 (defun gamegrid-make-color-tty-face (color)
 186   (let* ((color-str (if (symbolp color) (symbol-value color) color))
 187          (name (intern (format "gamegrid-color-tty-face-%s" color-str)))
 188          (face (make-face name)))
 189     (gamegrid-setup-face face color-str)
 190     face))
 191
 192 (defun gamegrid-make-grid-x-face ()
 193   (let ((face (make-face 'gamegrid-x-border-face)))
 194     (gamegrid-set-font face)
 195     face))
 196
 197 (defun gamegrid-make-mono-x-face ()
 198   (let ((face (make-face 'gamegrid-mono-x-face))
 199         (color (face-foreground 'default)))
 200     (if (null color)
 201         (setq color
 202               (cdr-safe (assq 'foreground-color (frame-parameters)))))
 203     (gamegrid-setup-face face color)
 204     face))
 205
 206 (defun gamegrid-make-color-x-face (color)
 207   (let* ((hex (gamegrid-color color 1.0))
 208          (name (intern (format "gamegrid-color-x-face-%s" hex)))
 209          (face (make-face name)))
 210     (gamegrid-setup-face face hex)
 211     face))
 212
 213 (defun gamegrid-make-face (data-spec-list color-spec-list)
 214   (let ((data (gamegrid-match-spec-list data-spec-list))
 215         (color (gamegrid-match-spec-list color-spec-list)))
 216     (case data
 217       ('color-x
 218        (gamegrid-make-color-x-face color))
 219       ('grid-x
 220        (unless gamegrid-grid-x-face
 221          (setq gamegrid-grid-x-face (gamegrid-make-grid-x-face)))
 222        gamegrid-grid-x-face)
 223       ('mono-x
 224        (unless gamegrid-mono-x-face
 225          (setq gamegrid-mono-x-face (gamegrid-make-mono-x-face)))
 226        gamegrid-mono-x-face)
 227       ('color-tty
 228        (gamegrid-make-color-tty-face color))
 229       ('mono-tty
 230        (unless gamegrid-mono-tty-face
 231          (setq gamegrid-mono-tty-face (gamegrid-make-mono-tty-face)))
 232        gamegrid-mono-tty-face))))
 233
 234 (defun gamegrid-colorize-glyph (color)
 235   (find-image `((:type xpm :data ,gamegrid-xpm
 236                        :ascent center
 237                        :color-symbols
 238                        (("col1" . ,(gamegrid-color color 0.6))
 239                         ("col2" . ,(gamegrid-color color 0.8))
 240                         ("col3" . ,(gamegrid-color color 1.0))))
 241                 (:type xbm :data ,gamegrid-xbm
 242                        :ascent center
 243                        :foreground ,(gamegrid-color color 1.0)
 244                        :background ,(gamegrid-color color 0.5)))))
 245
 246 (defun gamegrid-match-spec (spec)
 247   (let ((locale (car spec))
 248         (value (cadr spec)))
 249     (and (or (eq locale t)
 250              (and (listp locale)
 251                   (memq gamegrid-display-mode locale))
 252              (and (symbolp locale)
 253                   (eq gamegrid-display-mode locale)))
 254          value)))
 255
 256 (defun gamegrid-match-spec-list (spec-list)
 257   (and spec-list
 258        (or (gamegrid-match-spec (car spec-list))
 259            (gamegrid-match-spec-list (cdr spec-list)))))
 260
 261 (defun gamegrid-make-glyph (data-spec-list color-spec-list)
 262   (let ((data (gamegrid-match-spec-list data-spec-list))
 263         (color (gamegrid-match-spec-list color-spec-list)))
 264     (cond ((gamegrid-characterp data)
 265            (vector data))
 266           ((eq data 'colorize)
 267            (gamegrid-colorize-glyph color))
 268           ((listp data)
 269            (find-image data)) ;untested!
 270           ((vectorp data)
 271            (gamegrid-make-image-from-vector data)))))
 272
 273 (defun gamegrid-make-image-from-vector (vect)
 274   "Convert an XEmacs style \"glyph\" to an image-spec."
 275   (let ((l (list 'image :type)))
 276     (dotimes (n (length vect))
 277       (setf l (nconc l (list (aref vect n)))))
 278     (nconc l (list :ascent 'center))))
 279
 280 (defun gamegrid-display-type ()
 281   (cond ((and gamegrid-use-glyphs
 282               (display-images-p))
 283          'glyph)
 284         ((and gamegrid-use-color
 285               (display-graphic-p)
 286               (display-color-p))
 287          'color-x)
 288         ((display-graphic-p)
 289          'mono-x)
 290         ((and gamegrid-use-color
 291               (display-color-p))
 292          'color-tty)
 293         ((display-multi-font-p) ;???
 294          'mono-tty)
 295         (t
 296            'emacs-tty)))
 297
 298 (defun gamegrid-set-display-table ()
 299   (if (featurep 'xemacs)
 300       (add-spec-to-specifier current-display-table
 301                              gamegrid-display-table
 302                              (current-buffer)
 303                              nil
 304                              'remove-locale)
 305     (setq buffer-display-table gamegrid-display-table)))
 306
 307 (declare-function image-size "image.c" (spec &optional pixels frame))
 308
 309 (defun gamegrid-setup-default-font ()
 310   (setq gamegrid-face
 311         (copy-face 'default
 312                    (intern (concat "gamegrid-face-" (buffer-name)))))
 313   (when (eq gamegrid-display-mode 'glyph)
 314     (let ((max-height nil))
 315       (loop for c from 0 to 255 do
 316             (let ((glyph (aref gamegrid-display-table c)))
 317               (when (and (listp glyph) (eq (car  glyph) 'image))
 318                 (let ((height (cdr (image-size glyph))))
 319                   (if (or (null max-height)
 320                           (< max-height height))
 321                       (setq max-height height))))))
 322       (when (and max-height (< max-height 1))
 323         (let ((default-font-height (face-attribute 'default :height))
 324               (resy (/ (display-pixel-height) (/ (display-mm-height) 25.4)))
 325               point-size pixel-size)
 326           (setq point-size (/ (* (float default-font-height) max-height) 10)
 327                 pixel-size (floor (* resy (/ point-size 72.27)))
 328                 point-size (* (/ pixel-size resy) 72.27))
 329           (face-spec-set gamegrid-face
 330                          `((t :height ,(floor (* point-size 10))))))))))
 331
 332 (defun gamegrid-initialize-display ()
 333   (setq gamegrid-display-mode (gamegrid-display-type))
 334   (setq gamegrid-display-table (make-display-table))
 335   (setq gamegrid-face-table (make-vector 256 nil))
 336   (loop for c from 0 to 255 do
 337     (let* ((spec (aref gamegrid-display-options c))
 338            (glyph (gamegrid-make-glyph (car spec) (caddr spec)))
 339            (face (gamegrid-make-face (cadr spec) (caddr spec))))
 340       (aset gamegrid-face-table c face)
 341       (aset gamegrid-display-table c glyph)))
 342   (gamegrid-setup-default-font)
 343   (gamegrid-set-display-table)
 344   (setq cursor-type nil))
 345
 346
 347 (defun gamegrid-set-face (c)
 348   (if (eq gamegrid-display-mode 'glyph)
 349       (add-text-properties (1- (point)) (point)
 350                            (list 'display (list (aref gamegrid-display-table c))))
 351     (put-text-property (1- (point))
 352                        (point)
 353                        'face
 354                        (aref gamegrid-face-table c))))
 355
 356 (defun gamegrid-cell-offset (x y)
 357   (+ gamegrid-buffer-start
 358      (* (1+ gamegrid-buffer-width) y)
 359      x))
 360
 361 ;; ;;;;;;;;;;;;;;;; grid functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 362
 363 (defun gamegrid-get-cell (x y)
 364   (char-after (gamegrid-cell-offset x y)))
 365
 366 (defun gamegrid-set-cell (x y c)
 367   (save-excursion
 368     (let ((buffer-read-only nil))
 369       (goto-char (gamegrid-cell-offset x y))
 370       (delete-char 1)
 371       (insert-char c 1)
 372       (gamegrid-set-face c))))
 373
 374 (defun gamegrid-init-buffer (width height blank)
 375   (setq gamegrid-buffer-width width
 376         gamegrid-buffer-height height)
 377   (let ((line (concat
 378                (make-string width blank)
 379                "\n"))
 380         (buffer-read-only nil))
 381     (erase-buffer)
 382     (setq gamegrid-buffer-start (point))
 383     (dotimes (i height)
 384       (insert line))
 385     ;; Adjust the height of the default face to the height of the
 386     ;; images. Unlike XEmacs, Emacs doesn't allow to make the default
 387     ;; face buffer-local; so we do this with an overlay.
 388     (when (eq gamegrid-display-mode 'glyph)
 389       (overlay-put (make-overlay (point-min) (point-max))
 390                    'face gamegrid-face))
 391     (goto-char (point-min))))
 392
 393 (defun gamegrid-init (options)
 394   (setq buffer-read-only t
 395         truncate-lines t
 396         line-spacing 0
 397         gamegrid-display-options options)
 398   (buffer-disable-undo (current-buffer))
 399   (gamegrid-initialize-display))
 400
 401 ;; ;;;;;;;;;;;;;;;; timer functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 402
 403 (defun gamegrid-start-timer (period func)
 404   (setq gamegrid-timer
 405         (if (featurep 'xemacs)
 406             (start-itimer "Gamegrid"
 407                           func
 408                           period
 409                           period
 410                           nil
 411                           t
 412                           (current-buffer))
 413           (run-with-timer period
 414                           period
 415                           func
 416                           (current-buffer)))))
 417
 418 (defun gamegrid-set-timer (delay)
 419   (if gamegrid-timer
 420       (if (fboundp 'set-itimer-restart)
 421           (set-itimer-restart gamegrid-timer delay)
 422         (timer-set-time gamegrid-timer
 423                         (list (aref gamegrid-timer 1)
 424                               (aref gamegrid-timer 2)
 425                               (aref gamegrid-timer 3))
 426                         delay))))
 427
 428 (defun gamegrid-kill-timer ()
 429   (if gamegrid-timer
 430       (if (featurep 'xemacs)
 431           (delete-itimer gamegrid-timer)
 432         (cancel-timer gamegrid-timer)))
 433   (setq gamegrid-timer nil))
 434
 435 ;; ;;;;;;;;;;;;;;; high score functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 436
 437 (defun gamegrid-add-score (file score)
 438   "Add the current score to the high score file.
 439
 440 On POSIX systems there may be a shared game directory for all users in
 441 which the scorefiles are kept. On such systems Emacs doesn't create
 442 the score file FILE in this directory, if it doesn't already exist. In
 443 this case Emacs searches for FILE in the directory specified by
 444 `gamegrid-user-score-file-directory' and creates it there, if
 445 necessary.
 446
 447 To add the score file for a game to the system wide shared game
 448 directory, create the file with the shell command \"touch\" in this
 449 directory and make sure that it is owned by the correct user and
 450 group. You probably need special user privileges to do this.
 451
 452 On non-POSIX systems Emacs searches for FILE in the directory
 453 specified by the variable `temporary-file-directory'. If necessary,
 454 FILE is created there."
 455   (case system-type
 456     ((ms-dos windows-nt)
 457      (gamegrid-add-score-insecure file score))
 458     (t
 459      (gamegrid-add-score-with-update-game-score file score))))
 460
 461
 462 ;; On POSIX systems there are four cases to distinguish:
 463
 464 ;;     1. FILE is an absolute filename.  Then it should be a file in
 465 ;;        temporary file directory.  This is the way,
 466 ;;        `gamegrid-add-score' was supposed to be used in the past and
 467 ;;        is covered here for backward-compatibility.
 468 ;;
 469 ;;     2. The helper program "update-game-score" is setuid and the
 470 ;;        file FILE does already exist in a system wide shared game
 471 ;;        directory.  This should be the normal case on POSIX systems,
 472 ;;        if the game was installed system wide.  Use
 473 ;;        "update-game-score" to add the score to the file in the
 474 ;;        shared game directory.
 475 ;;
 476 ;;     3. "update-game-score" is setuid, but the file FILE does *not*
 477 ;;        exist in the system wide shared game directory.  Use
 478 ;;        `gamegrid-add-score-insecure' to create--if necessary--and
 479 ;;        update FILE.  This is for the case that a user has installed
 480 ;;        a game on her own.
 481 ;;
 482 ;;     4. "update-game-score" is not setuid.  Use it to create/update
 483 ;;        FILE in the user's home directory.  There is presumably no
 484 ;;        shared game directory.
 485
 486 (defvar gamegrid-shared-game-dir)
 487
 488 (defun gamegrid-add-score-with-update-game-score (file score)
 489   (let* ((result nil) ;; What is this good for? -- os
 490          (gamegrid-shared-game-dir
 491           (not (zerop (logand (file-modes
 492                                (expand-file-name "update-game-score"
 493                                                  exec-directory))
 494                               #o4000)))))
 495     (cond ((file-name-absolute-p file)
 496            (gamegrid-add-score-insecure file score))
 497           ((and gamegrid-shared-game-dir
 498                 (file-exists-p (expand-file-name file shared-game-score-directory)))
 499            ;; Use the setuid "update-game-score" program to update a
 500            ;; system-wide score file.
 501            (gamegrid-add-score-with-update-game-score-1 file
 502             (expand-file-name file shared-game-score-directory) score))
 503           ;; Else: Add the score to a score file in the user's home
 504           ;; directory.
 505           (gamegrid-shared-game-dir
 506            ;; If `gamegrid-shared-game-dir' is non-nil, then
 507            ;; "update-gamescore" program is setuid, so don't use it.
 508            (unless (file-exists-p
 509                     (directory-file-name gamegrid-user-score-file-directory))
 510              (make-directory gamegrid-user-score-file-directory t))
 511            (gamegrid-add-score-insecure file score
 512                                         gamegrid-user-score-file-directory))
 513           (t (let ((f (expand-file-name
 514                        gamegrid-user-score-file-directory)))
 515                (when (file-writable-p f)
 516                  (unless (eq (car-safe (file-attributes f))
 517                              t)
 518                    (make-directory f))
 519                  (setq f (expand-file-name file f))
 520                  (unless (file-exists-p f)
 521                    (write-region "" nil f nil 'silent nil 'excl)))
 522                (gamegrid-add-score-with-update-game-score-1 file f score))))))
 523
 524 (defun gamegrid-add-score-with-update-game-score-1 (file target score)
 525   (let ((default-directory "/")
 526         (errbuf (generate-new-buffer " *update-game-score loss*"))
 527         (marker-string (concat
 528                         (user-full-name)
 529                         " <"
 530                         (cond ((fboundp 'user-mail-address)
 531                                (user-mail-address))
 532                               ((boundp 'user-mail-address)
 533                                user-mail-address)
 534                               (t ""))
 535                         ">  "
 536                         (current-time-string))))
 537     ;; This can be called from a timer, so enable local quits.
 538     (with-local-quit
 539       (apply
 540        'call-process
 541        (append
 542         (list
 543          (expand-file-name "update-game-score" exec-directory)
 544          nil errbuf nil
 545          "-m" (int-to-string gamegrid-score-file-length)
 546          "-d" (if gamegrid-shared-game-dir
 547                   (expand-file-name shared-game-score-directory)
 548                 (file-name-directory target))
 549          file
 550          (int-to-string score)
 551          marker-string))))
 552     (if (buffer-modified-p errbuf)
 553         (progn
 554           (display-buffer errbuf)
 555           (error "Failed to update game score file"))
 556       (kill-buffer errbuf))
 557     (let ((buf (find-buffer-visiting target)))
 558       (save-excursion
 559         (if buf
 560             (progn
 561               (switch-to-buffer buf)
 562               (revert-buffer nil t nil)
 563               (display-buffer buf))
 564           (find-file-read-only target))
 565         (goto-char (point-min))
 566         (search-forward (concat (int-to-string score)
 567                                 " " (user-login-name) " "
 568                                 marker-string))
 569         (beginning-of-line)))))
 570
 571 (defun gamegrid-add-score-insecure (file score &optional directory)
 572   (save-excursion
 573     (setq file (expand-file-name file (or directory
 574                                           temporary-file-directory)))
 575     (find-file-other-window file)
 576     (setq buffer-read-only nil)
 577     (goto-char (point-max))
 578     (insert (format "%05d\t%s\t%s <%s>\n"
 579                     score
 580                     (current-time-string)
 581                     (user-full-name)
 582                     (cond ((fboundp 'user-mail-address)
 583                            (user-mail-address))
 584                           ((boundp 'user-mail-address)
 585                            user-mail-address)
 586                           (t ""))))
 587     (sort-fields 1 (point-min) (point-max))
 588     (reverse-region (point-min) (point-max))
 589     (goto-line (1+ gamegrid-score-file-length))
 590     (delete-region (point) (point-max))
 591     (setq buffer-read-only t)
 592     (save-buffer)))
 593
 594
 595 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 596
 597 (provide 'gamegrid)
 598
 599 ;; arch-tag: a96c2ff4-1c12-427e-bd3d-faeaf174cd46
 600 ;;; gamegrid.el ends here