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|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; A game database that stores PGN format games in a single file.
;;
;; This is basically what you expect from a file ending in .pgn.
;;
(defvar chess-file-locations)
(make-variable-buffer-local 'chess-file-locations)
(defun chess-file-handler (event &rest args)
(cond
((eq event 'open)
(with-current-buffer (find-file-noselect (car args))
(chess-file-handler 'rescan)
(current-buffer)))
((eq event 'rescan)
(goto-char (point-min))
(setq chess-file-locations nil)
(while (search-forward "[Event " nil t)
(goto-char (match-beginning 0))
(push (point) chess-file-locations)
(forward-char 1))
(setq chess-file-locations (nreverse chess-file-locations)))
((eq event 'save)
(save-buffer))
((eq event 'count)
(length chess-file-locations))
((eq event 'read)
(let ((index (car args)) game)
(when (and (>= index 0)
(< index (chess-file-handler 'count)))
(goto-char (nth index chess-file-locations))
(when (setq game (chess-pgn-to-game))
(chess-game-set-data game 'database (current-buffer))
(chess-game-set-data game 'database-index index)
(chess-game-set-data game 'database-count
(chess-file-handler 'count))
game))))
((eq event 'write)
(goto-char (point-max))
(while (memq (char-before) '(? ?\t ?\n ?\r))
(delete-backward-char 1))
(insert ?\n ?\n)
(push (point) chess-file-locations)
(chess-game-to-pgn (car args))
(1- (chess-file-handler 'count)))
((eq event 'replace)
(let ((index (or (cadr args)
(chess-game-data (car args) 'database-index)))
(count (chess-file-handler 'count)))
(when (and (>= index 0)
(< index count))
(goto-char (nth index chess-file-locations))
(delete-region (point) (if (= (1+ index) count)
(point-max)
(nth (1+ index) chess-file-locations)))
(chess-game-to-pgn (car args))
(insert ?\n))))))
(provide 'chess-file)
;;; chess-file.el ends here
|
