;;; bigclock.el --- Display the current time with large numbers.

;;; Copyright (C) 2001 by Daisuke Kakura

;; Author: Daisuke Kakura <info"AT"kakura.jp>
;; Created: 2001-02-07
;; Version: 1.0

;; This file is not part of Emacs

;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.

;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING.	If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This package provides the commands `bigclock' to display the
;; current time with large numbers.

;;; Installation

;; Put this file on your Emacs-Lisp load path and add following into
;; your ~/.emacs startup file
;;
;;	  (require 'bigclock)
;;	  (setq bigclock-jpn t) ; for Japanese users.

;;; Support

;; This program is available at <http://...>. Any comments,
;; suggestions, bug reports or upgrade requests are welcome.  Please
;; send them to Daisuke Kakura <info"AT"kakura.jp>.

;;; Change Log:

;; Version 1.0	 2001-02-07 Daisuke Kakura
;;		Initial revision.

;;; Code:

(require 'cl)

;; user defined variables.

(defvar bigclock-buffer-name "*bigclock*" "Name of the bigclock buffer.")
(defvar bigclock-quit-delay 3 "Time in secounds to delay before quitting bigclock.")
(defvar bigclock-margin "" "Margin on left.")
(defvar bigclock-24hour nil "Display time in 24-hour format.")
(defvar bigclock-no-zero t "t to remove first digit 0.")
(defvar bigclock-no-seconds nil "t to remove seconds.")
(defvar bigclock-jpn nil "Use Japanese font.")
(defvar bcns-japanese
   '("┏━━━┓" "    ┓   " "┏━━━┓" "┏━━━┓" "┓      ┓" "┏━━━┓" "┏━━━┓" "┏━━━┓" "┏━━━┓" "┏━━━┓"
     "┃      ┃" "    ┃   " "        ┃" "        ┃" "┃      ┃" "┃        " "┃        " "        ┃" "┃      ┃" "┃      ┃"
     "┃      ┃" "    ┃   " "        ┃" "        ┃" "┃      ┃" "┃        " "┃        " "        ┃" "┃      ┃" "┃      ┃"
     "┃      ┃" "    ┃   " "┏━━━┛" "┣━━━┫" "┃      ┃" "┗━━━┓" "┣━━━┓" "        ┃" "┣━━━┫" "┃      ┃"
     "┃      ┃" "    ┃   " "┃        " "        ┃" "┗━━━┫" "        ┃" "┃      ┃" "        ┃" "┃      ┃" "┗━━━┫"
     "┃      ┃" "    ┃   " "┃        " "        ┃" "        ┃" "        ┃" "┃      ┃" "        ┃" "┃      ┃" "        ┃"
     "┃      ┃" "    ┃   " "┃        " "        ┃" "        ┃" "        ┃" "┃      ┃" "        ┃" "┃      ┃" "        ┃"
     "┗━━━┛" "    ┗   " "┗━━━┛" "┗━━━┛" "        ┗" "┗━━━┛" "┗━━━┛" "        ┗" "┗━━━┛" "┗━━━┛"))
(defvar bcds-japanese
   '("      "
     "      "
     "  ・  "
     "      "
     "      "
     "  ・  "
     "      "
     "      "))
(defvar bcns-ascii
   '("+-------+ " "    +     " "+-------+ " "+-------+ " "+       + " "+-------+ " "+-------+ " "+-------+ " "+-------+ " "+-------+ "
     "|       | " "    |     " "        | " "        | " "|       | " "|         " "|         " "        | " "|       | " "|       | "
     "|       | " "    |     " "        | " "        | " "|       | " "|         " "|         " "        | " "|       | " "|       | "
     "|       | " "    |     " "+-------+ " "+-------+ " "|       | " "+-------+ " "+-------+ " "        | " "+-------+ " "|       | "
     "|       | " "    |     " "|         " "        | " "+-------+ " "        | " "|       | " "        | " "|       | " "+-------+ "
     "|       | " "    |     " "|         " "        | " "        | " "        | " "|       | " "        | " "|       | " "        | "
     "|       | " "    |     " "|         " "        | " "        | " "        | " "|       | " "        | " "|       | " "        | "
     "+-------+ " "    +     " "+-------+ " "+-------+ " "        + " "+-------+ " "+-------+ " "        + " "+-------+ " "+-------+ "))
(defvar bcds-ascii
   '("      "
     "      "
     "  *   "
     "      "
     "      "
     "  *   "
     "      "
     "      "))

(defvar bigclock-timer-handle nil "Handle for the update timer.")
(defvar bigclock-window nil "Pointer to the bigclock window.")
(defvar bigclock-toggle-stay nil "Keep displaying Bigclock or quit after `bigclock-quit-delay'.")

(defun nthcar (n l) "car of nthcdr"
	(car (nthcdr n l)))

(defun bigclock () "Display bigclock window."
	(interactive)
	(setq bcns bcns-ascii
			bcds bcds-ascii)
	(if bigclock-jpn
		(setq bcns bcns-japanese
				bcds bcds-japanese))
	(let ((window-min-height 9)
			(old-window (selected-window)))
		(if (window-live-p bigclock-window) ; bigclock stil exists.
			 (if bigclock-toggle-stay
				  (setq bigclock-toggle-stay nil)
				(setq bigclock-toggle-stay t))
		  (setq bigclock-window (split-window-vertically (- (window-height) 9))))
		(setf (selected-window) bigclock-window)
		(setq bigclock-buffer (switch-to-buffer bigclock-buffer-name))
		(unless bigclock-timer-handle
			(setq bigclock-timer-handle (run-at-time nil 1 #'bigclock-display)))
		(setf (selected-window) old-window)
		(unless bigclock-toggle-stay
			(if (sit-for bigclock-quit-delay)
				(bigclock-quit)))))

(defun bigclock-display () "Update the bigclock window."
	(with-current-buffer bigclock-buffer
		(let ((buffer-read-only nil))
			(setf (buffer-string) "")
			; get current time and chop it into 6 digits.
			(setq now (decode-time))
			(setq fixed-third (third now))
			(if (and (not bigclock-24hour) (> (third now) 12))
				(setq fixed-third (- (third now) 12)))
			(setq d1 (/ fixed-third	 10)
					d2 (- fixed-third	 (* d1 10))
					d3 (/ (second now) 10)
					d4 (- (second now) (* d3 10))
					d5 (/ (first now)	 10)
					d6 (- (first now)	 (* d5 10)))
			; prepare first digit and last two digits(seconds).
			(if (and bigclock-no-zero (= d1 0))
				(setq d100 "          "
						d110 "          "
						d120 "          "
						d130 "          "
						d140 "          "
						d150 "          "
						d160 "          "
						d170 "          ")
				(setq d100 (nthcar d1 bcns)
						d110 (nthcar (+ d1 10) bcns)
						d120 (nthcar (+ d1 20) bcns)
						d130 (nthcar (+ d1 30) bcns)
						d140 (nthcar (+ d1 40) bcns)
						d150 (nthcar (+ d1 50) bcns)
						d160 (nthcar (+ d1 60) bcns)
						d170 (nthcar (+ d1 70) bcns)))
			(if bigclock-no-seconds
				(setq dot0 ""
						dot1 ""
						dot2 ""
						dot3 ""
						dot4 ""
						dot5 ""
						dot6 ""
						dot7 ""
						d500 ""
						d510 ""
						d520 ""
						d530 ""
						d540 ""
						d550 ""
						d560 ""
						d570 ""
						d600 ""
						d610 ""
						d620 ""
						d630 ""
						d640 ""
						d650 ""
						d660 ""
						d670 "")
				(setq dot0 (nthcar 0 bcds)
						dot1 (nthcar 1 bcds)
						dot2 (nthcar 2 bcds)
						dot3 (nthcar 3 bcds)
						dot4 (nthcar 4 bcds)
						dot5 (nthcar 5 bcds)
						dot6 (nthcar 6 bcds)
						dot7 (nthcar 7 bcds)
						d500 (nthcar d5 bcns)
						d510 (nthcar (+ d5 10) bcns)
						d520 (nthcar (+ d5 20) bcns)
						d530 (nthcar (+ d5 30) bcns)
						d540 (nthcar (+ d5 40) bcns)
						d550 (nthcar (+ d5 50) bcns)
						d560 (nthcar (+ d5 60) bcns)
						d570 (nthcar (+ d5 70) bcns)
						d600 (nthcar d6 bcns)
						d610 (nthcar (+ d6 10) bcns)
						d620 (nthcar (+ d6 20) bcns)
						d630 (nthcar (+ d6 30) bcns)
						d640 (nthcar (+ d6 40) bcns)
						d650 (nthcar (+ d6 50) bcns)
						d660 (nthcar (+ d6 60) bcns)
						d670 (nthcar (+ d6 70) bcns)))
			; it's show time!
			(setf (buffer-string)
				(format (concat "%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n"
									 "%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n%s%s%s%s%s%s%s%s%s\n")
				bigclock-margin d100 (nthcar d2 bcns) (nthcar 0 bcds) (nthcar d3 bcns) (nthcar d4 bcns) dot0 d500 d600
				bigclock-margin d110 (nthcar (+ d2 10) bcns) (nthcar 1 bcds) (nthcar (+ d3 10) bcns) (nthcar (+ d4 10) bcns) dot1 d510 d610
				bigclock-margin d120 (nthcar (+ d2 20) bcns) (nthcar 2 bcds) (nthcar (+ d3 20) bcns) (nthcar (+ d4 20) bcns) dot2 d520 d620
				bigclock-margin d130 (nthcar (+ d2 30) bcns) (nthcar 3 bcds) (nthcar (+ d3 30) bcns) (nthcar (+ d4 30) bcns) dot3 d530 d630
				bigclock-margin d140 (nthcar (+ d2 40) bcns) (nthcar 4 bcds) (nthcar (+ d3 40) bcns) (nthcar (+ d4 40) bcns) dot4 d540 d640
				bigclock-margin d150 (nthcar (+ d2 50) bcns) (nthcar 5 bcds) (nthcar (+ d3 50) bcns) (nthcar (+ d4 50) bcns) dot5 d550 d650
				bigclock-margin d160 (nthcar (+ d2 60) bcns) (nthcar 6 bcds) (nthcar (+ d3 60) bcns) (nthcar (+ d4 60) bcns) dot6 d560 d660
				bigclock-margin d170 (nthcar (+ d2 70) bcns) (nthcar 7 bcds) (nthcar (+ d3 70) bcns) (nthcar (+ d4 70) bcns) dot7 d570 d670)))))

(defun bigclock-quit () "Close the bigclock."
	(interactive)
	(when bigclock-timer-handle
		(cancel-timer bigclock-timer-handle)
		(setq bigclock-timer-handle nil))
	(kill-buffer bigclock-buffer)
	(delete-window bigclock-window)
	(setq bigclock-toggle-stay nil))

(provide 'bigclock)
;;; bigclock.el ends here.