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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Plain ASCII chess display
;;
(require 'chess-display)
;;; Code:
(defgroup chess-plain nil
"A minimal, customizable ASCII display."
:group 'chess-display)
(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 :tag "Upper left corner")
(character :tag "Upper border")
(character :tag "Upper right corner")
(character :tag "Left border")
(character :tag "Right border")
(character :tag "Lower left corner")
(character :tag "Lowwer border")
(character :tag "Lower right corner")))
(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
(defcustom chess-plain-spacing 1
"*Number of spaces between pieces."
:group 'chess-plain
:type 'integer)
(defface chess-plain-black-face
'((((class color) (background light)) (:foreground "Green"))
(((class color) (background dark)) (:foreground "Green"))
(t (:bold t)))
"*The face used for black pieces on the ASCII display."
:group 'chess-plain)
(defface chess-plain-white-face
'((((class color) (background light)) (:foreground "Yellow"))
(((class color) (background dark)) (:foreground "Yellow"))
(t (:bold t)))
"*The face used for white pieces on the ASCII display."
:group 'chess-plain)
(defface chess-plain-highlight-face
'((((class color) (background light)) (:background "#add8e6"))
(((class color) (background dark)) (:background "#add8e6")))
"Face to use for highlighting pieces that have been selected."
:group 'chess-plain)
(defcustom chess-plain-popup-function 'chess-display-popup-in-window
"The function used to popup a chess-plain display."
:type 'function
:group 'chess-plain)
;;; Code:
(defun chess-plain-handler (event &rest args)
(cond
((eq event 'initialize) t)
((eq event 'popup)
(if chess-display-popup
(funcall chess-plain-popup-function)))
((eq event 'draw)
(apply 'chess-plain-draw args))
((eq event 'draw-square)
(apply 'chess-plain-draw-square args))
((eq event 'highlight)
(apply 'chess-plain-highlight args))))
(defun chess-plain-piece-text (piece rank file)
(let ((white-square (= (% (+ file rank) 2) 0)))
(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)))
(piece (cond
((eq what 'square-color)
(if white-square
(downcase pchar)
(upcase pchar)))
(t pchar)))
(p (char-to-string piece)))
(add-text-properties 0 1 (list 'face (if (> piece ?a)
'chess-plain-black-face
'chess-plain-white-face)) p)
p))))
(defsubst chess-plain-draw-square (pos piece index)
"Draw a piece image at point on an already drawn display."
(save-excursion
(goto-char pos)
(delete-char 1)
(insert (chess-plain-piece-text piece (chess-index-rank index)
(chess-index-file index)))))
(defun chess-plain-draw (position perspective)
"Draw the given POSITION from PERSPECTIVE's point of view.
PERSPECTIVE is t for white or nil for black."
(let ((inhibit-redisplay t)
(pos (point)))
(erase-buffer)
(let* ((inverted (not perspective))
(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 (* 7 chess-plain-spacing))
(nth 1 chess-plain-border-chars))
(nth 2 chess-plain-border-chars) ?\n))
(while (if inverted (>= rank 0) (< rank 8))
(if chess-plain-draw-border
(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)))
(begin (point)))
(insert (chess-plain-piece-text piece rank file))
(add-text-properties begin (point)
(list 'chess-coord
(chess-rf-to-index rank file)))
(when (if inverted (>= file 1) (< file 7))
(insert (make-string chess-plain-spacing ? ))))
(setq file (if inverted (1- file) (1+ file))))
(if chess-plain-draw-border
(insert (nth 4 chess-plain-border-chars)))
(insert ?\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 (* 7 chess-plain-spacing))
(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)
(let ((pos (chess-display-index-pos nil index)))
(put-text-property pos (1+ pos) 'face
(cond
((eq mode :selected)
'chess-plain-highlight-face)
(t
(chess-display-get-face mode))))))
(provide 'chess-plain)
;;; chess-plain.el ends here
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