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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Plain ASCII chess display
;;
;; $Revision$
(require 'chess-display)
;;; Code:
(defgroup chess-plain nil
"A minimal, customizable ASCII display."
:group 'chess-ascii)
(defcustom chess-plain-draw-border nil
"*Non-nil if a border should be drawn (using `chess-plain-border-chars')."
:group 'chess-plain
:type 'boolean)
(defcustom chess-plain-border-chars '(?+ ?- ?+ ?| ?| ?+ ?- ?+)
"*Characters used to draw borders."
:group 'chess-plain
:type '(list character character character character
character character character character))
(defcustom chess-plain-black-square-char ?.
"*Character used to indicate black squares."
:group 'chess-plain
:type 'character)
(defcustom chess-plain-white-square-char ?.
"*Character used to indicate white squares."
:group 'chess-plain
:type 'character)
(defcustom chess-plain-piece-chars
'((?K . ?K)
(?Q . ?Q)
(?R . ?R)
(?B . ?B)
(?N . ?N)
(?P . ?P)
(?k . ?k)
(?q . ?q)
(?r . ?r)
(?b . ?b)
(?n . ?n)
(?p . ?p))
"*Alist of pieces and their corresponding characters."
:group 'chess-plain
:type '(alist :key-type character :value-type character))
(defcustom chess-plain-upcase-indicates 'color
"*Defines what a upcase char should indicate.
The default is 'color, meaning a upcase char is a white piece, a
lowercase char a black piece. Possible values: 'color (default),
'square-color. If set to 'square-color, a uppercase character
indicates a piece on a black square. (Note that you also need to
modify `chess-plain-piece-chars' to avoid real confusion.)"
:group 'chess-plain
:type '(choice (const 'color) (const 'square-color)))
;; fails somehow
(defun chess-plain-draw ()
"Draw the given POSITION from PERSPECTIVE's point of view.
PERSPECTIVE is t for white or nil for black."
(if (null (get-buffer-window (current-buffer) t))
(pop-to-buffer (current-buffer)))
(let ((inhibit-redisplay t)
(pos (point)))
(erase-buffer)
(let* ((position (chess-display-position nil))
(inverted (null (chess-display-perspective nil)))
(rank (if inverted 7 0))
(file (if inverted 7 0))
beg)
(if chess-plain-draw-border
(insert ? (nth 0 chess-plain-border-chars)
(make-string 8 (nth 1 chess-plain-border-chars))
(nth 2 chess-plain-border-chars) ?\n))
(while (if inverted (>= rank 0) (< rank 8))
(if chess-plain-border-chars
(insert (number-to-string (- 8 rank))
(nth 3 chess-plain-border-chars)))
(while (if inverted (>= file 0) (< file 8))
(let ((piece (chess-pos-piece position
(chess-rf-to-index rank file)))
(white-square (evenp (+ file rank)))
(begin (point)))
(insert (if (eq piece ? )
(if white-square
chess-plain-white-square-char
chess-plain-black-square-char)
(let ((what chess-plain-upcase-indicates)
(pchar (cdr (assq piece chess-plain-piece-chars))))
(cond
((eq what 'square-color)
(if white-square
(downcase pchar)
(upcase pchar)))
(t pchar)))))
(add-text-properties begin (point)
(list 'chess-coord
(chess-rf-to-index rank file))))
(setq file (if inverted (1- file) (1+ file))))
(if chess-plain-draw-border
(insert (nth 4 chess-plain-border-chars) ?\n))
(setq file (if inverted 7 0)
rank (if inverted (1- rank) (1+ rank))))
(if chess-plain-draw-border
(insert ? (nth 5 chess-plain-border-chars)
(make-string 8 (nth 6 chess-plain-border-chars))
(nth 7 chess-plain-border-chars) ?\n
? ? (if (not inverted) "abcdefgh" "hgfedcba")))
(set-buffer-modified-p nil)
(goto-char pos))))
(defun chess-plain-highlight (index &optional mode)
(if (null (get-buffer-window (current-buffer) t))
(pop-to-buffer (current-buffer)))
(save-excursion
(beginning-of-line)
(goto-line (if chess-plain-draw-border
(+ 2 (chess-index-rank index))
(1+ (chess-index-rank index))))
(forward-char (if chess-plain-draw-border
(1+ (chess-index-file index))
(chess-index-file index)))
(put-text-property (point) (1+ (point)) 'face
'chess-display-highlight-face)))
(provide 'chess-plain)
;;; chess-plain.el ends here
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