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emacs/lisp/calendar/appt.el
Glenn Morris 3b316424bf (appt-disp-window): Use `calendar-set-mode-line' for a centered 
mode-line.

Takaaki Ota  <Takaaki.Ota@am.sony.com>:
(appt-disp-window): Do not split window excessively when
`split-height-threshold' is low.
2004-05-13 00:18:15 +00:00

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;;; appt.el --- appointment notification functions
;; Copyright (C) 1989, 1990, 1994, 1998, 2004 Free Software Foundation, Inc.
;; Author: Neil Mager <neilm@juliet.ll.mit.edu>
;; Maintainer: FSF
;; Keywords: calendar
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;; appt.el - visible and/or audible notification of
;; appointments from diary file.
;;
;;;
;;; Thanks to Edward M. Reingold for much help and many suggestions,
;;; And to many others for bug fixes and suggestions.
;;;
;;;
;;; This functions in this file will alert the user of a
;;; pending appointment based on his/her diary file. This package
;;; is documented in the Emacs manual.
;;;
;;; To activate this package, simply use (appt-activate 1).
;;; A `diary-file' with appointments of the format described in the
;;; documentation of the function `appt-check' is required.
;;; Relevant customizable variables are also listed in the
;;; documentation of that function.
;;;
;;; Today's appointment list is initialized from the diary when this
;;; package is activated. Additionally, the appointments list is
;;; recreated automatically at 12:01am for those who do not logout
;;; every day or are programming late. It is also updated when the
;;; `diary-file' is saved. Calling `appt-check' with an argument forces
;;; a re-initialization at any time.
;;;
;;; In order to add or delete items from today's list, without
;;; changing the diary file, use `appt-add' and `appt-delete'.
;;;
;;; Brief internal description - Skip this if you are not interested!
;;;
;;; The function `appt-make-list' creates the appointments list which
;;; `appt-check' reads.
;;;
;;; You can change the way the appointment window is created/deleted by
;;; setting the variables
;;;
;;; appt-disp-window-function
;;; and
;;; appt-delete-window-function
;;;
;;; For instance, these variables could be set to functions that display
;;; appointments in pop-up frames, which are lowered or iconified after
;;; `appt-display-interval' minutes.
;;;
;;; Code:
;; Make sure calendar is loaded when we compile this.
(require 'calendar)
;;;###autoload
(defcustom appt-issue-message t
"*Non-nil means check for appointments in the diary buffer.
To be detected, the diary entry must have the format described in the
documentation of the function `appt-check'."
:type 'boolean
:group 'appt)
(make-obsolete-variable 'appt-issue-message
"use the function `appt-activate', and the \
variable `appt-display-format' instead." "21.4")
;;;###autoload
(defcustom appt-message-warning-time 12
"*Time in minutes before an appointment that the warning begins."
:type 'integer
:group 'appt)
;;;###autoload
(defcustom appt-audible t
"*Non-nil means beep to indicate appointment."
:type 'boolean
:group 'appt)
;;;###autoload
(defcustom appt-visible t
"*Non-nil means display appointment message in echo area.
This variable is only relevant if `appt-msg-window' is nil."
:type 'boolean
:group 'appt)
(make-obsolete-variable 'appt-visible 'appt-display-format "21.4")
;;;###autoload
(defcustom appt-msg-window t
"*Non-nil means display appointment message in another window.
If non-nil, this variable overrides `appt-visible'."
:type 'boolean
:group 'appt)
(make-obsolete-variable 'appt-msg-window 'appt-display-format "21.4")
;; TODO - add popup.
(defcustom appt-display-format 'ignore
"How appointment reminders should be displayed.
The options are:
window - use a separate window
echo - use the echo area
nil - no visible reminder.
See also `appt-audible' and `appt-display-mode-line'.
The default value is 'ignore, which means to fall back on the value
of the (obsolete) variables `appt-msg-window' and `appt-visible'."
:type '(choice
(const :tag "Separate window" window)
(const :tag "Echo-area" echo)
(const :tag "No visible display" nil))
:group 'appt
:version "21.4")
;;;###autoload
(defcustom appt-display-mode-line t
"*Non-nil means display minutes to appointment and time on the mode line.
This is in addition to any other display of appointment messages."
:type 'boolean
:group 'appt)
;;;###autoload
(defcustom appt-display-duration 10
"*The number of seconds an appointment message is displayed.
Only relevant if reminders are to be displayed in their own window."
:type 'integer
:group 'appt)
;;;###autoload
(defcustom appt-display-diary t
"*Non-nil displays the diary when the appointment list is first initialized.
This will occur at midnight when the appointment list is updated."
:type 'boolean
:group 'appt)
(defcustom appt-display-interval 3
"*Number of minutes to wait between checking the appointment list."
:type 'integer
:group 'appt)
(defcustom appt-disp-window-function 'appt-disp-window
"Function called to display appointment window.
Only relevant if reminders are being displayed in a window."
:type '(choice (const appt-disp-window)
function)
:group 'appt)
(defcustom appt-delete-window-function 'appt-delete-window
"Function called to remove appointment window and buffer.
Only relevant if reminders are being displayed in a window."
:type '(choice (const appt-delete-window)
function)
:group 'appt)
;;; Internal variables below this point.
(defvar appt-buffer-name " *appt-buf*"
"Name of the appointments buffer.")
(defvar appt-time-msg-list nil
"The list of appointments for today.
Use `appt-add' and `appt-delete' to add and delete appointments.
The original list is generated from today's `diary-entries-list', and
can be regenerated using the function `appt-check'.
Each element of the generated list has the form (MINUTES) STRING; where
MINUTES is the time in minutes of the appointment after midnight, and
STRING is the description of the appointment.")
(defconst appt-max-time 1439
"11:59pm in minutes - number of minutes in a day minus 1.")
(defvar appt-mode-string nil
"String being displayed in the mode line saying you have an appointment.
The actual string includes the amount of time till the appointment.
Only used if `appt-display-mode-line' is non-nil.")
(defvar appt-prev-comp-time nil
"Time of day (mins since midnight) at which we last checked appointments.
A nil value forces the diary file to be (re-)checked for appointments.")
(defvar appt-now-displayed nil
"Non-nil when we have started notifying about a appointment that is near.")
(defvar appt-display-count nil
"Internal variable used to count number of consecutive reminders.")
(defvar appt-timer nil
"Timer used for diary appointment notifications (`appt-check').
If this is non-nil, appointment checking is active.")
;;; Functions.
(defun appt-display-message (string mins)
"Display a reminder about an appointment.
The string STRING describes the appointment, due in integer MINS minutes.
The format of the visible reminder is controlled by `appt-display-format'.
The variable `appt-audible' controls the audible reminder."
;; let binding for backwards compatability. Remove when obsolete
;; vars appt-msg-window and appt-visible are dropped.
(let ((appt-display-format
(if (eq appt-display-format 'ignore)
(cond (appt-msg-window 'window)
(appt-visible 'echo))
appt-display-format)))
(cond ((eq appt-display-format 'window)
(funcall appt-disp-window-function
(number-to-string mins)
(format-time-string "%a %b %e " (current-time))
string)
(run-at-time (format "%d sec" appt-display-duration)
nil
appt-delete-window-function))
((eq appt-display-format 'echo)
(message "%s" string)))
(if appt-audible (beep 1))))
(defun appt-check (&optional force)
"Check for an appointment and update any reminder display.
If optional argument FORCE is non-nil, reparse the diary file for
appointments. Otherwise the diary file is only parsed once per day,
and when saved.
Note: the time must be the first thing in the line in the diary
for a warning to be issued. The format of the time can be either
24 hour or am/pm. For example:
02/23/89
18:00 Dinner
Thursday
11:45am Lunch meeting.
Appointments are checked every `appt-display-interval' minutes.
The following variables control appointment notification:
`appt-display-format'
Controls the format in which reminders are displayed.
`appt-audible'
Variable used to determine if reminder is audible.
Default is t.
`appt-message-warning-time'
Variable used to determine when appointment message
should first be displayed.
`appt-display-mode-line'
If non-nil, a generic message giving the time remaining
is shown in the mode-line when an appointment is due.
`appt-display-interval'
Interval in minutes at which to check for pending appointments.
`appt-display-diary'
Display the diary buffer when the appointment list is
initialized for the first time in a day.
The following variables are only relevant if reminders are being
displayed in a window:
`appt-display-duration'
The number of seconds an appointment message is displayed.
`appt-disp-window-function'
Function called to display appointment window.
`appt-delete-window-function'
Function called to remove appointment window and buffer."
(let* ((min-to-app -1)
(prev-appt-mode-string appt-mode-string)
(prev-appt-display-count (or appt-display-count 0))
;; Non-nil means do a full check for pending appointments
;; and display in whatever ways the user has selected.
;; When no appointment is being displayed,
;; we always do a full check.
(full-check
(or (not appt-now-displayed)
;; This is true every appt-display-interval minutes.
(zerop (mod prev-appt-display-count appt-display-interval))))
;; Non-nil means only update the interval displayed in the mode line.
(mode-line-only
(and (not full-check) appt-now-displayed)))
(when (or full-check mode-line-only)
(save-excursion
;; Get the current time and convert it to minutes
;; from midnight. ie. 12:01am = 1, midnight = 0.
(let* ((now (decode-time))
(cur-hour (nth 2 now))
(cur-min (nth 1 now))
(cur-comp-time (+ (* cur-hour 60) cur-min)))
;; At the first check in any given day, update our
;; appointments to today's list.
(if (or force ; eg initialize, diary save
(null appt-prev-comp-time) ; first check
(< cur-comp-time appt-prev-comp-time)) ; new day
(condition-case nil
(if appt-display-diary
(let ((diary-hook
(if (assoc 'appt-make-list diary-hook)
diary-hook
(cons 'appt-make-list diary-hook))))
(diary))
(let ((diary-display-hook 'appt-make-list)
(d-buff (find-buffer-visiting
(substitute-in-file-name diary-file)))
selective)
(if d-buff ; diary buffer exists
(with-current-buffer d-buff
(setq selective selective-display)))
(diary)
;; If the diary buffer existed before this command,
;; restore its display state. Otherwise, kill it.
(if d-buff
;; Displays the diary buffer.
(or selective (show-all-diary-entries))
(and
(setq d-buff (find-buffer-visiting
(substitute-in-file-name diary-file)))
(kill-buffer d-buff)))))
(error nil)))
(setq appt-prev-comp-time cur-comp-time
appt-mode-string nil
appt-display-count nil)
;; If there are entries in the list, and the
;; user wants a message issued,
;; get the first time off of the list
;; and calculate the number of minutes until the appointment.
(if (and appt-issue-message appt-time-msg-list)
(let ((appt-comp-time (car (car (car appt-time-msg-list)))))
(setq min-to-app (- appt-comp-time cur-comp-time))
(while (and appt-time-msg-list
(< appt-comp-time cur-comp-time))
(setq appt-time-msg-list (cdr appt-time-msg-list))
(if appt-time-msg-list
(setq appt-comp-time
(car (car (car appt-time-msg-list))))))
;; If we have an appointment between midnight and
;; 'appt-message-warning-time' minutes after midnight,
;; we must begin to issue a message before midnight.
;; Midnight is considered 0 minutes and 11:59pm is
;; 1439 minutes. Therefore we must recalculate the minutes
;; to appointment variable. It is equal to the number of
;; minutes before midnight plus the number of
;; minutes after midnight our appointment is.
(if (and (< appt-comp-time appt-message-warning-time)
(> (+ cur-comp-time appt-message-warning-time)
appt-max-time))
(setq min-to-app (+ (- (1+ appt-max-time) cur-comp-time))
appt-comp-time))
;; issue warning if the appointment time is
;; within appt-message-warning time
(when (and (<= min-to-app appt-message-warning-time)
(>= min-to-app 0))
(setq appt-now-displayed t
appt-display-count (1+ prev-appt-display-count))
(unless mode-line-only
(appt-display-message (cadr (car appt-time-msg-list))
min-to-app))
(when appt-display-mode-line
(setq appt-mode-string
(format " App't in %s min." min-to-app)))
;; When an appointment is reached,
;; delete it from the list.
;; Reset the count to 0 in case we display another
;; appointment on the next cycle.
(if (zerop min-to-app)
(setq appt-time-msg-list (cdr appt-time-msg-list)
appt-display-count nil)))))
;; If we have changed the mode line string,
;; redisplay all mode lines.
(and appt-display-mode-line
(not (equal appt-mode-string
prev-appt-mode-string))
(progn
(force-mode-line-update t)
;; If the string now has a notification,
;; redisplay right now.
(if appt-mode-string
(sit-for 0)))))))))
(defun appt-disp-window (min-to-app new-time appt-msg)
"Display appointment message APPT-MSG in a separate buffer.
The appointment is due in MIN-TO-APP (a string) minutes.
NEW-TIME is a string giving the date."
(require 'electric)
;; Make sure we're not in the minibuffer
;; before splitting the window.
(if (equal (selected-window) (minibuffer-window))
(if (other-window 1)
(select-window (other-window 1))
(if (display-multi-frame-p)
(select-frame (other-frame 1)))))
(let ((this-window (selected-window))
(appt-disp-buf (set-buffer (get-buffer-create appt-buffer-name))))
(if (cdr (assq 'unsplittable (frame-parameters)))
;; In an unsplittable frame, use something somewhere else.
(display-buffer appt-disp-buf)
(unless (or (special-display-p (buffer-name appt-disp-buf))
(same-window-p (buffer-name appt-disp-buf)))
;; By default, split the bottom window and use the lower part.
(appt-select-lowest-window)
(select-window (split-window)))
(switch-to-buffer appt-disp-buf))
(calendar-set-mode-line
(format " Appointment in %s minutes. %s " min-to-app new-time))
(erase-buffer)
(insert appt-msg)
(shrink-window-if-larger-than-buffer (get-buffer-window appt-disp-buf t))
(set-buffer-modified-p nil)
(raise-frame (selected-frame))
(select-window this-window)))
(defun appt-delete-window ()
"Function called to undisplay appointment messages.
Usually just deletes the appointment buffer."
(let ((window (get-buffer-window appt-buffer-name t)))
(and window
(or (eq window (frame-root-window (window-frame window)))
(delete-window window))))
(kill-buffer appt-buffer-name)
(if appt-audible
(beep 1)))
(defun appt-select-lowest-window ()
"Select the lowest window on the frame."
(let ((lowest-window (selected-window))
(bottom-edge (nth 3 (window-edges))))
(walk-windows (lambda (w)
(let ((next-bottom-edge (nth 3 (window-edges w))))
(when (< bottom-edge next-bottom-edge)
(setq bottom-edge next-bottom-edge
lowest-window w)))))
(select-window lowest-window)))
;;;###autoload
(defun appt-add (new-appt-time new-appt-msg)
"Add an appointment for the day at NEW-APPT-TIME and issue message NEW-APPT-MSG.
The time should be in either 24 hour format or am/pm format."
(interactive "sTime (hh:mm[am/pm]): \nsMessage: ")
(unless (string-match "[0-9]?[0-9][:.][0-9][0-9]\\(am\\|pm\\)?"
new-appt-time)
(error "Unacceptable time-string"))
(let* ((appt-time-string (concat new-appt-time " " new-appt-msg))
(appt-time (list (appt-convert-time new-appt-time)))
(time-msg (cons appt-time (list appt-time-string))))
(setq appt-time-msg-list (nconc appt-time-msg-list (list time-msg)))
(setq appt-time-msg-list (appt-sort-list appt-time-msg-list))))
;;;###autoload
(defun appt-delete ()
"Delete an appointment from the list of appointments."
(interactive)
(let ((tmp-msg-list appt-time-msg-list))
(while tmp-msg-list
(let* ((element (car tmp-msg-list))
(prompt-string (concat "Delete "
;; We want to quote any doublequotes
;; in the string, as well as put
;; doublequotes around it.
(prin1-to-string
(substring-no-properties
(car (cdr element)) 0))
" from list? "))
(test-input (y-or-n-p prompt-string)))
(setq tmp-msg-list (cdr tmp-msg-list))
(if test-input
(setq appt-time-msg-list (delq element appt-time-msg-list)))))
(appt-check)
(message "")))
(eval-when-compile (defvar number)
(defvar original-date)
(defvar diary-entries-list))
;;;###autoload
(defun appt-make-list ()
"Create the appointments list from today's diary buffer.
The time must be at the beginning of a line for it to be
put in the appointments list (see examples in documentation of
the function `appt-check'). We assume that the variables DATE and
NUMBER hold the arguments that `list-diary-entries' received.
They specify the range of dates that the diary is being processed for."
;; We have something to do if the range of dates that the diary is
;; considering includes the current date.
(if (and (not (calendar-date-compare
(list (calendar-current-date))
(list original-date)))
(calendar-date-compare
(list (calendar-current-date))
(list (calendar-gregorian-from-absolute
(+ (calendar-absolute-from-gregorian original-date)
number)))))
(save-excursion
;; Clear the appointments list, then fill it in from the diary.
(setq appt-time-msg-list nil)
(if diary-entries-list
;; Cycle through the entry-list (diary-entries-list)
;; looking for entries beginning with a time. If
;; the entry begins with a time, add it to the
;; appt-time-msg-list. Then sort the list.
(let ((entry-list diary-entries-list)
(new-time-string ""))
;; Skip diary entries for dates before today.
(while (and entry-list
(calendar-date-compare
(car entry-list) (list (calendar-current-date))))
(setq entry-list (cdr entry-list)))
;; Parse the entries for today.
(while (and entry-list
(calendar-date-equal
(calendar-current-date) (car (car entry-list))))
(let ((time-string (cadr (car entry-list))))
(while (string-match
"\\([0-9]?[0-9][:.][0-9][0-9]\\(am\\|pm\\)?\\).*"
time-string)
(let* ((beg (match-beginning 0))
;; Get just the time for this appointment.
(only-time (match-string 1 time-string))
;; Find the end of this appointment
;; (the start of the next).
(end (string-match
"^[ \t]*[0-9]?[0-9][:.][0-9][0-9]\\(am\\|pm\\)?"
time-string
(match-end 0)))
;; Get the whole string for this appointment.
(appt-time-string
(substring time-string beg (if end (1- end)))))
;; Add this appointment to appt-time-msg-list.
(let* ((appt-time (list (appt-convert-time only-time)))
(time-msg (list appt-time appt-time-string)))
(setq appt-time-msg-list
(nconc appt-time-msg-list (list time-msg))))
;; Discard this appointment from the string.
(setq time-string
(if end (substring time-string end) "")))))
(setq entry-list (cdr entry-list)))))
(setq appt-time-msg-list (appt-sort-list appt-time-msg-list))
;; Get the current time and convert it to minutes
;; from midnight. ie. 12:01am = 1, midnight = 0,
;; so that the elements in the list
;; that are earlier than the present time can
;; be removed.
(let* ((now (decode-time))
(cur-hour (nth 2 now))
(cur-min (nth 1 now))
(cur-comp-time (+ (* cur-hour 60) cur-min))
(appt-comp-time (car (caar appt-time-msg-list))))
(while (and appt-time-msg-list (< appt-comp-time cur-comp-time))
(setq appt-time-msg-list (cdr appt-time-msg-list))
(if appt-time-msg-list
(setq appt-comp-time (car (caar appt-time-msg-list)))))))))
(defun appt-sort-list (appt-list)
"Sort an appointment list, putting earlier items at the front.
APPT-LIST is a list of the same format as `appt-time-msg-list'."
(sort appt-list (lambda (e1 e2) (< (caar e1) (caar e2)))))
(defun appt-convert-time (time2conv)
"Convert hour:min[am/pm] format to minutes from midnight.
A period (.) can be used instead of a colon (:) to separate the
hour and minute parts."
(let ((conv-time 0)
(hr 0)
(min 0))
(string-match "[:.]\\([0-9][0-9]\\)" time2conv)
(setq min (string-to-int
(match-string 1 time2conv)))
(string-match "[0-9]?[0-9][:.]" time2conv)
(setq hr (string-to-int
(match-string 0 time2conv)))
;; convert the time appointment time into 24 hour time
(cond ((and (string-match "pm" time2conv) (< hr 12))
(setq hr (+ 12 hr)))
((and (string-match "am" time2conv) (= hr 12))
(setq hr 0)))
;; convert the actual time
;; into minutes for comparison
;; against the actual time.
(setq conv-time (+ (* hr 60) min))
conv-time))
(defun appt-update-list ()
"If the current buffer is visiting the diary, update appointments.
This function is intended for use with `write-file-functions'."
(and (string-equal buffer-file-name (expand-file-name diary-file))
appt-timer
(let ((appt-display-diary nil))
(appt-check t)))
nil)
;;;###autoload
(defun appt-activate (&optional arg)
"Toggle checking of appointments.
With optional numeric argument ARG, turn appointment checking on if
ARG is positive, otherwise off."
(interactive "P")
(let ((appt-active appt-timer))
(setq appt-active (if arg (> (prefix-numeric-value arg) 0)
(not appt-active)))
(remove-hook 'write-file-functions 'appt-update-list)
(or global-mode-string (setq global-mode-string '("")))
(delq 'appt-mode-string global-mode-string)
(when appt-timer
(cancel-timer appt-timer)
(setq appt-timer nil))
(when appt-active
(add-hook 'write-file-functions 'appt-update-list)
(setq appt-timer (run-at-time t 60 'appt-check)
global-mode-string
(append global-mode-string '(appt-mode-string)))
(appt-check t))))
;; This is needed for backwards compatibility. Feh.
(appt-activate 1)
(provide 'appt)
;;; arch-tag: bf5791c4-8921-499e-a26f-772b1788d347
;;; appt.el ends here
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