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[Emacs-diffs] Changes to emacs/lisp/play/mpuz.el


From: Eli Zaretskii
Subject: [Emacs-diffs] Changes to emacs/lisp/play/mpuz.el
Date: Fri, 08 Mar 2002 03:11:21 -0500

Index: emacs/lisp/play/mpuz.el
diff -c emacs/lisp/play/mpuz.el:1.20 emacs/lisp/play/mpuz.el:1.21
*** emacs/lisp/play/mpuz.el:1.20        Thu Dec 20 13:19:40 2001
--- emacs/lisp/play/mpuz.el     Fri Mar  8 03:11:21 2002
***************
*** 1,8 ****
  ;;; mpuz.el --- multiplication puzzle for GNU Emacs
  
! ;; Copyright (C) 1990 Free Software Foundation, Inc.
  
  ;; Author: Philippe Schnoebelen <address@hidden>
  ;; Keywords: games
  
  ;; This file is part of GNU Emacs.
--- 1,9 ----
  ;;; mpuz.el --- multiplication puzzle for GNU Emacs
  
! ;; Copyright (C) 1990, 2002 Free Software Foundation, Inc.
  
  ;; Author: Philippe Schnoebelen <address@hidden>
+ ;; Overhauled: Daniel Pfeiffer <address@hidden>
  ;; Keywords: games
  
  ;; This file is part of GNU Emacs.
***************
*** 24,33 ****
  
  ;;; Commentary:
  
! ;; When this package is loaded, `M-x mpuz' generates a random multiplication
! ;; puzzle.  This is a multiplication example in which each digit has been
! ;; consistently replaced with some letter.  Your job is to reconstruct
! ;; the original digits.  Type `?' while the mode is active for detailed help.
  
  ;;; Code:
  
--- 25,34 ----
  
  ;;; Commentary:
  
! ;; `M-x mpuz' generates a random multiplication puzzle.  This is a
! ;; multiplication example in which each digit has been consistently replaced
! ;; with some letter.  Your job is to reconstruct the original digits.  Type
! ;; `?' while the mode is active for detailed help.
  
  ;;; Code:
  
***************
*** 38,51 ****
  
  (random t)                            ; randomize
  
! (defcustom mpuz-silent nil
!   "*Set this to t if you don't want dings on inputs."
    :type 'boolean
    :group 'mpuz)
  
! (defun mpuz-ding ()
!   "Dings, unless global variable `mpuz-silent' forbids it."
!   (or mpuz-silent (ding t)))
  
  
  ;; Mpuz mode and keymaps
--- 39,85 ----
  
  (random t)                            ; randomize
  
! (defcustom mpuz-silent 'error
!   "*Set this to `nil' if you want dings on inputs.
! `t' means never ding, and `error' means only ding on wrong input."
!   :type '(choice (const :tag "No" nil)
!                (const :tag "Yes" t)
!                (const :tag "If correct" error))
!   :group 'mpuz)
! 
! (defcustom mpuz-solve-when-trivial t
!   "*Solve any row that can be trivially calculated from what you've found."
    :type 'boolean
    :group 'mpuz)
  
! (defcustom mpuz-allow-double-multiplicator nil
!   "*Allow 2nd factors like 33 or 77."
!   :type 'boolean
!   :group 'mpuz)
! 
! (defcustom mpuz-unsolved-face
!   `(,(facemenu-get-face 'fg:red) bold)
!   "*Face to use for letters to be solved."
!   :type '(repeat face)
!   :group 'mpuz)
! 
! (defcustom mpuz-solved-face
!   `(,(facemenu-get-face 'fg:green) bold)
!   "*Face to use for solved digits."
!   :type '(repeat face)
!   :group 'mpuz)
! 
! (defcustom mpuz-trivial-face
!   `(,(facemenu-get-face 'fg:blue) bold)
!   "*Face to use for trivial digits solved for you."
!   :type '(repeat face)
!   :group 'mpuz)
! 
! (defcustom mpuz-text-face
!   '(variable-pitch)
!   "*Face to use for text on right."
!   :type '(repeat face)
!   :group 'mpuz)
  
  
  ;; Mpuz mode and keymaps
***************
*** 59,87 ****
    "Local keymap to use in Mult Puzzle.")
  
  (if mpuz-mode-map nil
!     (setq mpuz-mode-map (make-sparse-keymap))
!     (define-key mpuz-mode-map "a" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "b" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "c" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "d" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "e" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "f" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "g" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "h" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "i" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "j" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "A" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "B" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "C" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "D" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "E" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "F" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "G" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "H" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "I" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "J" 'mpuz-try-letter)
!     (define-key mpuz-mode-map "\C-g" 'mpuz-offer-abort)
!     (define-key mpuz-mode-map "?" 'describe-mode))
  
  (defun mpuz-mode ()
    "Multiplication puzzle mode.
--- 93,121 ----
    "Local keymap to use in Mult Puzzle.")
  
  (if mpuz-mode-map nil
!   (setq mpuz-mode-map (make-sparse-keymap))
!   (define-key mpuz-mode-map "a" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "b" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "c" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "d" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "e" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "f" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "g" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "h" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "i" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "j" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "A" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "B" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "C" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "D" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "E" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "F" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "G" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "H" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "I" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "J" 'mpuz-try-letter)
!   (define-key mpuz-mode-map "\C-g" 'mpuz-offer-abort)
!   (define-key mpuz-mode-map "?" 'describe-mode))
  
  (defun mpuz-mode ()
    "Multiplication puzzle mode.
***************
*** 90,103 ****
  multiplication displayed inside the `*Mult Puzzle*' buffer.
  
  You may enter a guess for a letter's value by typing first the letter,
! then the digit.  Thus, to guess that A=3, type A 3.
  
  To leave the game to do other editing work, just switch buffers.
  Then you may resume the game with M-x mpuz.
  You may abort a game by typing \\<mpuz-mode-map>\\[mpuz-offer-abort]."
    (interactive)
    (setq major-mode 'mpuz-mode
!       mode-name  "Mult Puzzle")
    (use-local-map mpuz-mode-map)
    (run-hooks 'mpuz-mode-hook))
  
--- 124,138 ----
  multiplication displayed inside the `*Mult Puzzle*' buffer.
  
  You may enter a guess for a letter's value by typing first the letter,
! then the digit.  Thus, to guess that A=3, type `A 3'.
  
  To leave the game to do other editing work, just switch buffers.
  Then you may resume the game with M-x mpuz.
  You may abort a game by typing \\<mpuz-mode-map>\\[mpuz-offer-abort]."
    (interactive)
    (setq major-mode 'mpuz-mode
!       mode-name  "Mult Puzzle"
!       tab-width 30)
    (use-local-map mpuz-mode-map)
    (run-hooks 'mpuz-mode-hook))
  
***************
*** 119,129 ****
  (defvar mpuz-in-progress nil
    "True if a game is currently in progress.")
  
! (defvar mpuz-found-digits (make-vector 10 nil)
    "A vector recording which digits have been decrypted.")
  
  (defmacro mpuz-digit-solved-p (digit)
!   (list 'aref 'mpuz-found-digits digit))
  
  
  ;; A puzzle uses a permutation of [0..9] into itself.
--- 154,168 ----
  (defvar mpuz-in-progress nil
    "True if a game is currently in progress.")
  
! (defvar mpuz-found-digits (make-bool-vector 10 nil)
    "A vector recording which digits have been decrypted.")
  
+ (defvar mpuz-trivial-digits (make-bool-vector 10 nil)
+   "A vector recording which digits have been solved for you.")
+ 
  (defmacro mpuz-digit-solved-p (digit)
!   `(or (aref mpuz-found-digits ,digit)
!        (aref mpuz-trivial-digits ,digit)))
  
  
  ;; A puzzle uses a permutation of [0..9] into itself.
***************
*** 160,179 ****
  (defvar mpuz-board (make-vector 10 nil)
    "The board associates to any digit the list of squares where it appears.")
  
! (defun mpuz-put-digit-on-board (number square)
!   "Put (last digit of) NUMBER on SQUARE of the puzzle board."
!   ;; i.e. push SQUARE on NUMBER square-list
!   (setq number (% number 10))
!   (aset mpuz-board number (cons square (aref mpuz-board number))))
  
! (defun mpuz-check-all-solved ()
    "Check whether all digits have been solved. Return t if yes."
!   (catch 'found
!     (let ((digit -1))
!       (while (> 10 (setq digit (1+ digit)))
!       (if (and (not (mpuz-digit-solved-p digit)) ; unsolved
!                (aref mpuz-board digit)) ; and appearing in the puzzle !
!           (throw 'found nil))))
      t))
  
  
--- 199,252 ----
  (defvar mpuz-board (make-vector 10 nil)
    "The board associates to any digit the list of squares where it appears.")
  
! (defun mpuz-put-number-on-board (number row &rest l)
!   "Put (last digit of) NUMBER on ROW and COLUMNS of the puzzle board."
!   (let (digit)
!     (while l
!       (setq digit (% number 10)
!           number (/ number 10))
!       (aset mpuz-board digit `((,row . ,(car l)) ,@(aref mpuz-board digit)))
!       (setq l (cdr l)))))
  
! (defun mpuz-check-all-solved (&optional row col)
    "Check whether all digits have been solved. Return t if yes."
!   (catch 'solved
!     (let (A B1 B2 C D E squares)
!       (and mpuz-solve-when-trivial
!          (not row)
!          (while
!              (cond ((or (and (setq B1 (or B1 (mpuz-check-all-solved 4 7))
!                                    B2 (or B2 (mpuz-check-all-solved 4 9))
!                                    E (or E (mpuz-check-all-solved 10))
!                                    A (or A (mpuz-check-all-solved 2)))
!                              B1 B2)
!                         (and E (or A (and B1 B2))))
!                     (mpuz-solve)
!                     (mpuz-paint-board)
!                     (throw 'solved t))
!                    ((and (setq D (or D (mpuz-check-all-solved 8))
!                                C (or C (mpuz-check-all-solved 6)))
!                          D (not E))
!                     (mpuz-solve 10))
!                    ((and E (not (eq C D)))
!                     (mpuz-solve (if D 6 8)))
!                    ((and A (not (eq B2 C)))
!                     (mpuz-solve (if C 4 6) (if C 9)))
!                    ((and A (not (eq B1 D)))
!                     (mpuz-solve (if D 4 8) (if D 7)))
!                    ((and (not A) (or (and B2 C) (and B1 D)))
!                     (mpuz-solve 2)))))
!       (mpuz-paint-board)
!       (mapc (lambda (digit)
!             (and (not (mpuz-digit-solved-p digit)) ; unsolved
!                  (setq squares (aref mpuz-board digit))
!                  (if row
!                      (if col
!                          (member (cons row col) squares)
!                        (assq row squares))
!                    squares) ; and appearing in the puzzle!
!                  (throw 'solved nil)))
!           [0 1 2 3 4 5 6 7 8 9]))
      t))
  
  
***************
*** 186,303 ****
    "Draw random values to be multiplied in a puzzle."
    (mpuz-build-random-perm)
    (fillarray mpuz-board nil)          ; erase the board
!   (let (A B C D E)
!     ;; A,B,C,D & E, are the five rows of our multiplication.
!     ;; Choose random values, discarding uninteresting cases.
!     (while (progn
!            (setq A (random 1000)
!                  B (random 100)
!                  C (* A (% B 10))
!                  D (* A (/ B 10))
!                  E (* A B))
!            (or (< C 1000) (< D 1000)))) ; forbid leading zeros in C or D
      ;; Individual digits are now put on their respective squares.
!     ;; [NB: A square is a pair <row,column> of the screen.]
!     (mpuz-put-digit-on-board A                 '(2 . 9))
!     (mpuz-put-digit-on-board (/ A 10)  '(2 . 7))
!     (mpuz-put-digit-on-board (/ A 100)         '(2 . 5))
!     (mpuz-put-digit-on-board B                 '(4 . 9))
!     (mpuz-put-digit-on-board (/ B 10)  '(4 . 7))
!     (mpuz-put-digit-on-board C                 '(6 . 9))
!     (mpuz-put-digit-on-board (/ C 10)  '(6 . 7))
!     (mpuz-put-digit-on-board (/ C 100)         '(6 . 5))
!     (mpuz-put-digit-on-board (/ C 1000)        '(6 . 3))
!     (mpuz-put-digit-on-board D                 '(8 . 7))
!     (mpuz-put-digit-on-board (/ D 10)  '(8 . 5))
!     (mpuz-put-digit-on-board (/ D 100)         '(8 . 3))
!     (mpuz-put-digit-on-board (/ D 1000)        '(8 . 1))
!     (mpuz-put-digit-on-board E                 '(10 . 9))
!     (mpuz-put-digit-on-board (/ E 10)  '(10 . 7))
!     (mpuz-put-digit-on-board (/ E 100)         '(10 . 5))
!     (mpuz-put-digit-on-board (/ E 1000)        '(10 . 3))
!     (mpuz-put-digit-on-board (/ E 10000) '(10 . 1))))
  
  ;; Display
  ;;--------
  (defconst mpuz-framework
    "
       . . .
!                    Number of errors (this game): 0
      x  . .
     -------
     . . . .
!                         Number of completed games: 0
   . . . .
!  ---------              Average number of errors: 0.00
   . . . . ."
    "The general picture of the puzzle screen, as a string.")
  
  (defun mpuz-create-buffer ()
    "Create (or recreate) the puzzle buffer. Return it."
!   (let ((buff (get-buffer-create "*Mult Puzzle*")))
      (save-excursion
!       (set-buffer buff)
!       (let ((buffer-read-only nil))
!       (erase-buffer)
!       (insert mpuz-framework)
!       (mpuz-paint-board)
!       (mpuz-paint-errors)
!       (mpuz-paint-statistics)))
!     buff))
  
  (defun mpuz-paint-errors ()
    "Paint error count on the puzzle screen."
    (mpuz-switch-to-window)
!   (let ((buffer-read-only nil))
!     (goto-line 3)
!     (move-to-column 49)
!     (mpuz-delete-line)
!     (insert (prin1-to-string mpuz-nb-errors))))
  
  (defun mpuz-paint-statistics ()
    "Paint statistics about previous games on the puzzle screen."
!   (let* ((mean (if (zerop mpuz-nb-completed-games) 0
!                  (/ (+ mpuz-nb-completed-games (* 200 
mpuz-nb-cumulated-errors))
!                     (* 2 mpuz-nb-completed-games))))
!        (frac-part (% mean 100)))
!     (let ((buffer-read-only nil))
!       (goto-line 7)
!       (move-to-column 51)
!       (mpuz-delete-line)
!       (insert (prin1-to-string mpuz-nb-completed-games))
!       (goto-line 9)
!       (move-to-column 50)
!       (mpuz-delete-line)
!       (insert (format "%d.%d%d" (/ mean 100) (/ frac-part 10) (% frac-part 
10))))))
  
  (defun mpuz-paint-board ()
    "Paint board situation on the puzzle screen."
    (mpuz-switch-to-window)
!   (let ((letter -1))
!     (while (> 10 (setq letter (1+ letter)))
!       (mpuz-paint-digit (mpuz-to-digit letter))))
    (goto-char (point-min)))
  
  (defun mpuz-paint-digit (digit)
    "Paint all occurrences of DIGIT on the puzzle board."
-   ;; (mpuz-switch-to-window)
    (let ((char (if (mpuz-digit-solved-p digit)
                  (+ digit ?0)
!                 (+ (mpuz-to-letter digit) ?A)))
!       (square-l (aref mpuz-board digit)))
!     (let ((buffer-read-only nil))
!       (while square-l
!       (goto-line (car (car square-l)))        ; line before column !
!       (move-to-column (cdr (car square-l)))
!       (insert char)
!       (delete-char 1)
!       (backward-char 1)
!       (setq square-l (cdr square-l))))))
! 
! (defun mpuz-delete-line ()
!   "Clear from point to next newline." ; & put nothing in the kill ring
!   (while (not (= ?\n (char-after (point))))
!     (delete-char 1)))
  
  (defun mpuz-get-buffer ()
    "Get the puzzle buffer if it exists."
--- 259,363 ----
    "Draw random values to be multiplied in a puzzle."
    (mpuz-build-random-perm)
    (fillarray mpuz-board nil)          ; erase the board
!   ;; A,B,C,D & E, are the five rows of our multiplication.
!   ;; Choose random values, discarding cases with leading zeros in C or D.
!   (let* ((A (+ 112 (random 888)))
!        (min (1+ (/ 1000 A)))
!        (B1 (+ min (random (- 10 min))))
!        B2 C D E)
!     (while (if (= B1 (setq B2 (+ min (random (- 10 min)))))
!              (not mpuz-allow-double-multiplicator)))
!     (setq C (* A B2)
!         D (* A B1)
!         E (+ C (* D 10)))
      ;; Individual digits are now put on their respective squares.
!     ;; [NB: A square is a pair (row . column) of the screen.]
!     (mpuz-put-number-on-board A       2                9 7 5)
!     (mpuz-put-number-on-board (+ (* B1 10) B2) 4 9 7)
!     (mpuz-put-number-on-board C       6                9 7 5 3)
!     (mpuz-put-number-on-board D 8                7 5 3 1)
!     (mpuz-put-number-on-board E       10               9 7 5 3 1)))
  
  ;; Display
  ;;--------
  (defconst mpuz-framework
    "
       . . .
!       Number of errors (this game):   0
      x  . .
     -------
     . . . .
!       Number of completed games:      0
   . . . .
!  ---------    Average number of errors:       0.00
   . . . . ."
    "The general picture of the puzzle screen, as a string.")
  
  (defun mpuz-create-buffer ()
    "Create (or recreate) the puzzle buffer. Return it."
!   (let ((buf (get-buffer-create "*Mult Puzzle*"))
!       (face `(face ,mpuz-text-face))
!       buffer-read-only)
      (save-excursion
!       (set-buffer buf)
!       (erase-buffer)
!       (insert mpuz-framework)
!       (set-text-properties 13 42 face)
!       (set-text-properties 79 105 face)
!       (set-text-properties 128 153 face)
!       (mpuz-paint-board)
!       (mpuz-paint-errors)
!       (mpuz-paint-statistics))
!     buf))
! 
! (defun mpuz-paint-number (n &optional eol words)
!   (end-of-line eol)
!   (let (buffer-read-only)
!     (delete-region (point)
!                  (progn (backward-word (or words 1)) (point)))
!     (insert n)))
  
  (defun mpuz-paint-errors ()
    "Paint error count on the puzzle screen."
    (mpuz-switch-to-window)
!   (goto-line 3)
!   (mpuz-paint-number (prin1-to-string mpuz-nb-errors)))
  
  (defun mpuz-paint-statistics ()
    "Paint statistics about previous games on the puzzle screen."
!   (goto-line 7)
!   (mpuz-paint-number (prin1-to-string mpuz-nb-completed-games))
!   (mpuz-paint-number
!    (format "%.2f"
!          (if (zerop mpuz-nb-completed-games)
!              0
!            (/ (+ 0.0 mpuz-nb-cumulated-errors)
!               mpuz-nb-completed-games)))
!    3 2))
  
  (defun mpuz-paint-board ()
    "Paint board situation on the puzzle screen."
    (mpuz-switch-to-window)
!   (mapc 'mpuz-paint-digit [0 1 2 3 4 5 6 7 8 9])
    (goto-char (point-min)))
  
  (defun mpuz-paint-digit (digit)
    "Paint all occurrences of DIGIT on the puzzle board."
    (let ((char (if (mpuz-digit-solved-p digit)
                  (+ digit ?0)
!               (+ (mpuz-to-letter digit) ?A)))
!       (face `(face
!               ,(cond ((aref mpuz-trivial-digits digit) mpuz-trivial-face)
!                      ((aref mpuz-found-digits digit) mpuz-solved-face)
!                      (mpuz-unsolved-face))))
!       buffer-read-only)
!     (mapc (lambda (square)
!           (goto-line (car square))    ; line before column!
!           (move-to-column (cdr square))
!           (insert char)
!           (set-text-properties (1- (point)) (point) face)
!           (delete-char 1))
!         (aref mpuz-board digit))))
  
  (defun mpuz-get-buffer ()
    "Get the puzzle buffer if it exists."
***************
*** 305,346 ****
  
  (defun mpuz-switch-to-window ()
    "Find or create the Mult-Puzzle buffer, and display it."
!   (let ((buff (mpuz-get-buffer)))
!     (or buff (setq buff (mpuz-create-buffer)))
!     (switch-to-buffer buff)
      (or buffer-read-only (toggle-read-only))
      (mpuz-mode)))
  
  
  ;; Game control
  ;;-------------
- (defun mpuz-abort-game ()
-   "Abort any puzzle in progress."
-   (message "Mult Puzzle aborted.")
-   (setq mpuz-in-progress nil
-       mpuz-nb-errors 0)
-   (fillarray mpuz-board nil)
-   (let ((buff (mpuz-get-buffer)))
-     (if buff (kill-buffer buff))))
- 
  (defun mpuz-start-new-game ()
    "Start a new puzzle."
    (message "Here we go...")
    (setq mpuz-nb-errors 0
        mpuz-in-progress t)
    (fillarray mpuz-found-digits nil)   ; initialize mpuz-found-digits
    (mpuz-random-puzzle)
    (mpuz-switch-to-window)
    (mpuz-paint-board)
    (mpuz-paint-errors)
    (mpuz-ask-for-try))
  
- (defun mpuz-offer-new-game ()
-   "Ask if user wants to start a new puzzle."
-   (if (y-or-n-p "Start a new game ")
-       (mpuz-start-new-game)
-       (message "OK. I won't.")))
- 
  ;;;###autoload
  (defun mpuz ()
    "Multiplication puzzle with GNU Emacs."
--- 365,392 ----
  
  (defun mpuz-switch-to-window ()
    "Find or create the Mult-Puzzle buffer, and display it."
!   (let ((buf (mpuz-get-buffer)))
!     (or buf (setq buf (mpuz-create-buffer)))
!     (switch-to-buffer buf)
      (or buffer-read-only (toggle-read-only))
      (mpuz-mode)))
  
  
  ;; Game control
  ;;-------------
  (defun mpuz-start-new-game ()
    "Start a new puzzle."
    (message "Here we go...")
    (setq mpuz-nb-errors 0
        mpuz-in-progress t)
    (fillarray mpuz-found-digits nil)   ; initialize mpuz-found-digits
+   (fillarray mpuz-trivial-digits nil)
    (mpuz-random-puzzle)
    (mpuz-switch-to-window)
    (mpuz-paint-board)
    (mpuz-paint-errors)
    (mpuz-ask-for-try))
  
  ;;;###autoload
  (defun mpuz ()
    "Multiplication puzzle with GNU Emacs."
***************
*** 349,366 ****
    (mpuz-switch-to-window)
    (if mpuz-in-progress
        (mpuz-offer-abort)
!       (mpuz-start-new-game)))
  
  (defun mpuz-offer-abort ()
    "Ask if user wants to abort current puzzle."
    (interactive)
    (if (y-or-n-p "Abort game ")
!       (mpuz-abort-game)
!       (mpuz-ask-for-try)))
  
  (defun mpuz-ask-for-try ()
    "Ask for user proposal in puzzle."
!   (message "Your try ?"))
  
  (defun mpuz-try-letter ()
    "Propose a digit for a letter in puzzle."
--- 395,423 ----
    (mpuz-switch-to-window)
    (if mpuz-in-progress
        (mpuz-offer-abort)
!     (mpuz-start-new-game)))
  
  (defun mpuz-offer-abort ()
    "Ask if user wants to abort current puzzle."
    (interactive)
    (if (y-or-n-p "Abort game ")
!       (let ((buf (mpuz-get-buffer)))
!       (message "Mult Puzzle aborted.")
!       (setq mpuz-in-progress nil
!             mpuz-nb-errors 0)
!       (fillarray mpuz-board nil)
!       (if buf (kill-buffer buf)))
!     (mpuz-ask-for-try)))
  
  (defun mpuz-ask-for-try ()
    "Ask for user proposal in puzzle."
!   (message "Your try?"))
! 
! (defun mpuz-ding (error)
!   "Dings, unless global variable `mpuz-silent' forbids it."
!   (cond ((eq mpuz-silent t))
!       ((not mpuz-silent) (ding t))
!       (error (ding t))))
  
  (defun mpuz-try-letter ()
    "Propose a digit for a letter in puzzle."
***************
*** 370,378 ****
        (setq letter-char (upcase last-command-char)
              digit (mpuz-to-digit (- letter-char ?A)))
        (cond ((mpuz-digit-solved-p digit)
!              (message "%c already solved." letter-char))
              ((null (aref mpuz-board digit))
!              (message "%c does not appear." letter-char))
              ((progn (message "%c = " letter-char)
                      ;; <char> has been entered.
                      ;; Print "<char> =" and
--- 427,437 ----
        (setq letter-char (upcase last-command-char)
              digit (mpuz-to-digit (- letter-char ?A)))
        (cond ((mpuz-digit-solved-p digit)
!              (message "%c already solved." letter-char)
!              (mpuz-ding t))
              ((null (aref mpuz-board digit))
!              (message "%c does not appear." letter-char)
!              (mpuz-ding t))
              ((progn (message "%c = " letter-char)
                      ;; <char> has been entered.
                      ;; Print "<char> =" and
***************
*** 380,457 ****
                      (setq digit-char (read-char))
                      (if (eq digit-char ?=)
                          (setq digit-char (read-char)))
-                     (message "%c = %c" letter-char digit-char)
                      (or (> digit-char ?9) (< digit-char ?0))) ; bad input
!              (ding t))
              (t
               (mpuz-try-proposal letter-char digit-char))))
!       (mpuz-offer-new-game)))
  
  (defun mpuz-try-proposal (letter-char digit-char)
    "Propose LETTER-CHAR as code for DIGIT-CHAR."
    (let* ((letter (- letter-char ?A))
         (digit (- digit-char ?0))
!        (correct-digit (mpuz-to-digit letter)))
      (cond ((mpuz-digit-solved-p correct-digit)
           (message "%c has already been found." (+ correct-digit ?0)))
          ((mpuz-digit-solved-p digit)
           (message "%c has already been placed." digit-char))
          ((= digit correct-digit)
!          (message "%c = %c correct !" letter-char digit-char)
!          (mpuz-ding)
!          (mpuz-correct-guess digit))
          (t ;;; incorrect guess
!          (message "%c = %c incorrect !" letter-char digit-char)
!          (mpuz-ding)
           (setq mpuz-nb-errors (1+ mpuz-nb-errors))
           (mpuz-paint-errors)))))
  
- (defun mpuz-correct-guess (digit)
-   "Handle correct guessing of DIGIT."
-   (aset mpuz-found-digits digit t)    ; Mark digit as solved
-   (mpuz-paint-digit digit)            ; Repaint it (now as a digit)
-   (if (mpuz-check-all-solved)
-       (mpuz-close-game)))
- 
  (defun mpuz-close-game ()
    "Housecleaning when puzzle has been solved."
    (setq mpuz-in-progress nil
        mpuz-nb-cumulated-errors (+ mpuz-nb-cumulated-errors mpuz-nb-errors)
        mpuz-nb-completed-games (1+ mpuz-nb-completed-games))
    (mpuz-paint-statistics)
!   (let ((message (mpuz-congratulate)))
      (message message)
      (sit-for 4)
      (if (y-or-n-p (concat message "  Start a new game "))
        (mpuz-start-new-game)
!       (message "Good Bye !"))))
  
! (defun mpuz-congratulate ()
!   "Build a congratulation message when puzzle is solved."
!   (format "Puzzle solved with %d error%s. %s"
!          mpuz-nb-errors
!          (if (= mpuz-nb-errors 1) "" "s")
!          (cond ((= mpuz-nb-errors 0)        "That's perfect !")
!                ((= mpuz-nb-errors 1)        "That's very good !")
!                ((= mpuz-nb-errors 2)        "That's good.")
!                ((= mpuz-nb-errors 3)        "That's not bad.")
!                ((= mpuz-nb-errors 4)        "That's not too bad...")
!                ((and (>= mpuz-nb-errors 5)
!                      (< mpuz-nb-errors 10)) "That's bad !")
!                ((and (>= mpuz-nb-errors 10)
!                      (< mpuz-nb-errors 15)) "That's awful.")
!                ((>= mpuz-nb-errors 15)      "That's not serious."))))
  
! (defun mpuz-show-solution ()
    "Display solution for debugging purposes."
!   (interactive)
    (mpuz-switch-to-window)
!   (let (digit list)
!     (setq digit -1)
!     (while (> 10 (setq digit (1+ digit)))
!       (or (mpuz-digit-solved-p digit)
!         (setq list (cons digit list))))
!     (mapcar 'mpuz-correct-guess list)))
  
  (provide 'mpuz)
  
--- 439,518 ----
                      (setq digit-char (read-char))
                      (if (eq digit-char ?=)
                          (setq digit-char (read-char)))
                      (or (> digit-char ?9) (< digit-char ?0))) ; bad input
!              (message "%c = %c" letter-char digit-char)
!              (mpuz-ding t))
              (t
               (mpuz-try-proposal letter-char digit-char))))
!     (if (y-or-n-p "Start a new game ")
!       (mpuz-start-new-game)
!       (message "OK. I won't."))))
  
  (defun mpuz-try-proposal (letter-char digit-char)
    "Propose LETTER-CHAR as code for DIGIT-CHAR."
    (let* ((letter (- letter-char ?A))
         (digit (- digit-char ?0))
!        (correct-digit (mpuz-to-digit letter))
!        (game mpuz-nb-completed-games))
      (cond ((mpuz-digit-solved-p correct-digit)
           (message "%c has already been found." (+ correct-digit ?0)))
          ((mpuz-digit-solved-p digit)
           (message "%c has already been placed." digit-char))
          ((= digit correct-digit)
!          (message "%c = %c correct!" letter-char digit-char)
!          (mpuz-ding nil)
!          (aset mpuz-found-digits digit t)     ; Mark digit as solved
!          (and (mpuz-check-all-solved)
!               (mpuz-close-game)))
          (t ;;; incorrect guess
!          (message "%c = %c incorrect!" letter-char digit-char)
!          (mpuz-ding t)
           (setq mpuz-nb-errors (1+ mpuz-nb-errors))
           (mpuz-paint-errors)))))
  
  (defun mpuz-close-game ()
    "Housecleaning when puzzle has been solved."
    (setq mpuz-in-progress nil
        mpuz-nb-cumulated-errors (+ mpuz-nb-cumulated-errors mpuz-nb-errors)
        mpuz-nb-completed-games (1+ mpuz-nb-completed-games))
    (mpuz-paint-statistics)
!   (let ((message (format "Puzzle solved with %d error%s. That's %s"
!                        mpuz-nb-errors
!                        (if (= mpuz-nb-errors 1) "" "s")
!                        (cond ((= mpuz-nb-errors 0)    "perfect!")
!                              ((= mpuz-nb-errors 1)    "very good!")
!                              ((= mpuz-nb-errors 2)    "good.")
!                              ((= mpuz-nb-errors 3)    "not bad.")
!                              ((= mpuz-nb-errors 4)    "not too bad...")
!                              ((< mpuz-nb-errors 10)   "bad!")
!                              ((< mpuz-nb-errors 15)   "awful.")
!                              (t                       "not serious.")))))
      (message message)
      (sit-for 4)
      (if (y-or-n-p (concat message "  Start a new game "))
        (mpuz-start-new-game)
!       (message "Good Bye!"))))
  
! (defun mpuz-solve (&optional row col)
!   "Find solution for autosolving."
!   (mapc (lambda (digit)
!         (or (mpuz-digit-solved-p digit)
!             (if row
!                 (not (if col
!                          (member (cons row col) (aref mpuz-board digit))
!                        (assq row (aref mpuz-board digit)))))
!             (aset mpuz-trivial-digits digit t)))
!       [0 1 2 3 4 5 6 7 8 9])
!   t)
  
! (defun mpuz-show-solution (row)
    "Display solution for debugging purposes."
!   (interactive "P")
    (mpuz-switch-to-window)
!   (mpuz-solve (if row (* 2 (prefix-numeric-value row))))
!   (mpuz-paint-board)
!   (if (mpuz-check-all-solved)
!       (mpuz-close-game)))
  
  (provide 'mpuz)
  



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