1 ;;; gnus-diary.el --- Wrapper around the NNDiary Gnus backend
3 ;; Copyright (C) 1999-2001 Didier Verna.
5 ;; Author: Didier Verna <didier@xemacs.org>
6 ;; Maintainer: Didier Verna <didier@xemacs.org>
7 ;; Created: Tue Jul 20 10:42:55 1999 under XEmacs 21.2 (beta 18)
8 ;; Last Revision: Wed Sep 12 12:31:09 2001
9 ;; Keywords: calendar mail news
11 ;; This file is part of NNDiary.
13 ;; NNDiary is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2 of the License, or
16 ;; (at your option) any later version.
18 ;; NNDiary is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with this program; if not, write to the Free Software
25 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 ;; Contents management by FCM version 0.1.
35 ;; Gnus-Diary is a wrapper around the NNDiary Gnus backend. It is here to
36 ;; make your nndiary-user life easier in different ways. So, you don't have
37 ;; to use it if you don't want to. But, really, you should.
39 ;; Gnus-Diary offers the following features on top of the NNDiary backend:
41 ;; - A nice summary line format:
42 ;; Displaying diary messages in standard summary line format (usually
43 ;; something like "<From Joe>: <Subject>") is pretty useless. Most of the
44 ;; time, you're the one who wrote the message, and you mostly want to see
45 ;; the event's date. Gnus-Diary offers you a nice summary line format
46 ;; which will do this. By default, a summary line will appear like this:
48 ;; <Event Date>: <Subject> <Remaining time>
50 ;; for example, here's how Joe's birthday is displayed in my
51 ;; "nndiary:birhdays" summary buffer (the message is expirable, but will
52 ;; never be deleted, as it specifies a regular event):
54 ;; E Sat, Sep 22 01, 12:00: Joe's birthday (in 6 months, 1 week)
56 ;; - More article sorting functions:
57 ;; Gnus-Diary adds a new sorting function called
58 ;; `gnus-summary-sort-by-schedule'. This function lets you organize your
59 ;; diary summary buffers from the closest event to the farthest one.
61 ;; - Automatic generation of diary group parameters:
62 ;; When you create a new diary group, or visit one, Gnus-Diary checks your
63 ;; group parameters, and if needed, sets the summary line format to the
64 ;; diary-specific value, adds the diary-specific sorting functions, and
65 ;; also adds the different `X-Diary-*' headers to the group's
66 ;; posting-style. It is then easier to send a diary message, because if
67 ;; you use `C-u a' or `C-u m' on a diary group to prepare a message, these
68 ;; headers will be inserted automatically (but not filled with proper
71 ;; - An interactive mail-to-diary convertion function:
72 ;; The function `gnus-diary-check-message' ensures that the current message
73 ;; contains all the required diary headers, and prompts you for values /
74 ;; correction if needed. This function is hooked in the nndiary backend so
75 ;; that moving an article to an nndiary group will trigger it
76 ;; automatically. It is also bound to `C-c D c' in message-mode and
77 ;; article-edit-mode in order to ease the process of converting a usual
78 ;; mail to a diary one. This function takes a prefix argument which will
79 ;; force prompting of all diary headers, regardless of their
80 ;; presence/validity. That way, you can very easily reschedule a diary
81 ;; message for instance.
87 ;; 0/ Don't use any `gnus-user-format-function-[d|D]'. Gnus-Diary provides
88 ;; both of these (sorry if you used them before).
89 ;; 1/ Add '(require 'gnus-diary) to your gnusrc file.
90 ;; 2/ Customize your gnus-diary options to suit your needs.
104 (defgroup gnus-diary nil
105 "Utilities on top of the nndiary backend for Gnus.")
107 (defcustom gnus-diary-summary-line-format "%U%R%z %uD: %(%s%) (%ud)\n"
108 "*Summary line format for nndiary groups."
111 :group 'gnus-summary-format)
113 (defcustom gnus-diary-time-format "%a, %b %e %y, %H:%M"
114 "*Time format to display appointements in nndiary summary buffers.
115 Please refer to `format-time-string' for information on possible values."
119 (defcustom gnus-diary-delay-format-function 'gnus-diary-delay-format-english
120 "*Function called to format a diary delay string.
121 It is passed two arguments. The first one is non nil if the delay is in
122 the past. The second one is of the form ((NUM . UNIT) ...) where NUM is
123 an integer and UNIT is one of 'year 'month 'week 'day 'hour or 'minute.
124 It should return strings like \"In 2 months, 3 weeks\", \"3 hours,
125 1 minute ago\" and so on.
127 There are currently two built-in format functions:
128 `gnus-diary-delay-format-english' (the default)
129 `gnus-diary-delay-format-french'"
130 :type '(choice (const :tag "english" gnus-diary-delay-format-english)
131 (const :tag "french" gnus-diary-delay-format-french)
132 (symbol :tag "other"))
135 (defconst gnus-diary-version nndiary-version
136 "Current Diary backend version.")
139 ;; Summary line format ======================================================
141 (defun gnus-diary-delay-format-french (past delay)
144 ;; Keep only a precision of two degrees
145 (and (> (length delay) 1) (setf (nthcdr 2 delay) nil))
146 (concat (if past "il y a " "dans ")
149 (while (setq del (pop delay))
150 (setq str (concat str
151 (int-to-string (car del)) " "
152 (cond ((eq (cdr del) 'year)
154 ((eq (cdr del) 'month)
156 ((eq (cdr del) 'week)
160 ((eq (cdr del) 'hour)
162 ((eq (cdr del) 'minute)
164 (unless (or (eq (cdr del) 'month)
171 (defun gnus-diary-delay-format-english (past delay)
174 ;; Keep only a precision of two degrees
175 (and (> (length delay) 1) (setf (nthcdr 2 delay) nil))
176 (concat (unless past "in ")
179 (while (setq del (pop delay))
180 (setq str (concat str
181 (int-to-string (car del)) " "
182 (symbol-name (cdr del))
183 (and (> (car del) 1) "s")
189 (defun gnus-diary-header-schedule (headers)
190 ;; Same as `nndiary-schedule', but given a set of headers HEADERS
193 (let ((head (cdr (assoc (intern (format "X-Diary-%s" (car elt)))
196 (nndiary-parse-schedule-value head (cadr elt) (caddr elt)))))
199 ;; #### NOTE: Gnus sometimes gives me a HEADER not corresponding to any
200 ;; message, with all fields set to nil here. I don't know what it is for, and
202 (defun gnus-user-format-function-d (header)
203 ;; Returns an aproximative delay string for the next occurence of this
204 ;; message. The delay is given only in the first non zero unit.
205 ;; Code partly stolen from article-make-date-line
206 (let* ((extras (mail-header-extra header))
207 (sched (gnus-diary-header-schedule extras))
208 (occur (nndiary-next-occurence sched (current-time)))
210 (real-time (subtract-time occur now)))
213 (let* ((sec (+ (* (float (car real-time)) 65536) (cadr real-time)))
216 (and past (setq sec (- sec)))
218 ;; This is a bit convoluted, but basically we go through the time
219 ;; units for years, weeks, etc, and divide things to see whether
220 ;; that results in positive answers.
221 (let ((units `((year . ,(* 365.25 24 3600))
222 (month . ,(* 31 24 3600))
223 (week . ,(* 7 24 3600))
228 (while (setq unit (pop units))
229 (unless (zerop (setq num (ffloor (/ sec (cdr unit)))))
230 (setq delay (append delay `((,(floor num) . ,(car unit))))))
231 (setq sec (- sec (* num (cdr unit)))))))
232 (funcall gnus-diary-delay-format-function past delay)))
235 ;; #### NOTE: Gnus sometimes gives me a HEADER not corresponding to any
236 ;; message, with all fields set to nil here. I don't know what it is for, and
238 (defun gnus-user-format-function-D (header)
239 ;; Returns a formatted time string for the next occurence of this message.
240 (let* ((extras (mail-header-extra header))
241 (sched (gnus-diary-header-schedule extras))
242 (occur (nndiary-next-occurence sched (current-time))))
243 (format-time-string gnus-diary-time-format occur)))
246 ;; Article sorting functions ================================================
248 (defun gnus-article-sort-by-schedule (h1 h2)
249 (let* ((now (current-time))
250 (e1 (mail-header-extra h1))
251 (e2 (mail-header-extra h2))
252 (s1 (gnus-diary-header-schedule e1))
253 (s2 (gnus-diary-header-schedule e2))
254 (o1 (nndiary-next-occurence s1 now))
255 (o2 (nndiary-next-occurence s2 now)))
256 (if (and (= (car o1) (car o2)) (= (cadr o1) (cadr o2)))
257 (< (mail-header-number h1) (mail-header-number h2))
258 (time-less-p o1 o2))))
261 (defun gnus-thread-sort-by-schedule (h1 h2)
262 (gnus-article-sort-by-schedule (gnus-thread-header h1)
263 (gnus-thread-header h2)))
265 (defun gnus-summary-sort-by-schedule (&optional reverse)
266 "Sort nndiary summary buffers by schedule of appointements.
267 Optional prefix (or REVERSE argument) means sort in reverse order."
269 (gnus-summary-sort 'schedule reverse))
271 (defvar gnus-summary-misc-menu)
273 (add-hook 'gnus-summary-menu-hook
275 (easy-menu-add-item gnus-summary-misc-menu
278 gnus-summary-sort-by-schedule
279 (eq (car (gnus-find-method-for-group
280 gnus-newsgroup-name))
286 ;; Group parameters autosetting =============================================
288 (defun gnus-diary-update-group-parameters (group)
289 ;; Ensure that nndiary groups have convenient group parameters:
290 ;; - a posting style containing X-Diary headers
291 ;; - a nice summary line format
292 ;; - NNDiary specific sorting by schedule functions
293 ;; In general, try not to mess with what the user might have modified.
294 (let ((posting-style (gnus-group-get-parameter group 'posting-style t)))
296 (mapcar (lambda (elt)
297 (let ((header (format "X-Diary-%s" (car elt))))
298 (unless (assoc header posting-style)
299 (setq posting-style (append posting-style
303 (gnus-group-set-parameter group 'posting-style posting-style)
304 ;; Summary line format:
305 (unless (gnus-group-get-parameter group 'gnus-summary-line-format t)
306 (gnus-group-set-parameter group 'gnus-summary-line-format
307 `(,gnus-diary-summary-line-format)))
308 ;; Sorting by schedule:
309 (unless (gnus-group-get-parameter group 'gnus-article-sort-functions)
310 (gnus-group-set-parameter group 'gnus-article-sort-functions
311 '((append gnus-article-sort-functions
313 'gnus-article-sort-by-schedule)))))
314 (unless (gnus-group-get-parameter group 'gnus-thread-sort-functions)
315 (gnus-group-set-parameter group 'gnus-thread-sort-functions
316 '((append gnus-thread-sort-functions
318 'gnus-thread-sort-by-schedule)))))
321 ;; Called when a group is subscribed. This is needed because groups created
322 ;; because of mail splitting are *not* created with the backend function.
323 ;; Thus, `nndiary-request-create-group-hooks' is inoperative.
324 (defun gnus-diary-maybe-update-group-parameters (group)
325 (when (eq (car (gnus-find-method-for-group group)) 'nndiary)
326 (gnus-diary-update-group-parameters group)))
328 (add-hook 'nndiary-request-create-group-hooks
329 'gnus-diary-update-group-parameters)
330 ;; Now that we have `gnus-subscribe-newsgroup-hooks', this is not needed
331 ;; anymore. Maybe I should remove this completely.
332 (add-hook 'nndiary-request-update-info-hooks
333 'gnus-diary-update-group-parameters)
334 (add-hook 'gnus-subscribe-newsgroup-hooks
335 'gnus-diary-maybe-update-group-parameters)
338 ;; Diary Message Checking ===================================================
341 (if (fboundp 'kill-entire-line)
342 (defalias 'gnus-diary-kill-entire-line 'kill-entire-line)
343 (defun gnus-diary-kill-entire-line ()
345 (let ((kill-whole-line t))
348 (defvar gnus-diary-header-value-history nil
349 ;; History variable for header value prompting
352 (defun gnus-diary-narrow-to-headers ()
353 "Narrow the current buffer to the header part.
354 Point is left at the beginning of the region.
355 The buffer is assumed to contain a message, but the format is unknown."
356 (cond ((eq major-mode 'message-mode)
357 (message-narrow-to-headers))
359 (goto-char (point-min))
360 (when (search-forward "\n\n" nil t)
361 (narrow-to-region (point-min) (- (point) 1))
362 (goto-char (point-min))))
365 (defun gnus-diary-add-header (str)
366 "Add a header to the current buffer.
367 The buffer is assumed to contain a message, but the format is unknown."
368 (cond ((eq major-mode 'message-mode)
369 (message-add-header str))
372 (gnus-diary-narrow-to-headers)
373 (goto-char (point-max))
374 (if (string-match "\n$" str)
379 (defun gnus-diary-check-message (arg)
380 "Ensure that the current message is a valid for NNDiary.
381 This function checks that all NNDiary required headers are present and
382 valid, and prompts for values / correction otherwise.
384 If ARG (or prefix) is non-nil, force prompting for all fields."
389 (let ((header (concat "X-Diary-" (car head)))
392 ;; First, try to find the header, and checks for validity:
394 (gnus-diary-narrow-to-headers)
395 (when (re-search-forward (concat "^" header ":") nil t)
396 (unless (eq (char-after) ? )
398 (setq value (buffer-substring (point) (gnus-point-at-eol)))
399 (and (string-match "[ \t]*\\([^ \t]+\\)[ \t]*" value)
400 (setq value (match-string 1 value)))
402 (nndiary-parse-schedule-value value
403 (nth 1 head) (nth 2 head))
406 ;; #### NOTE: this (along with the `gnus-diary-add-header'
407 ;; function) could be rewritten in a better way, in particular
408 ;; not to blindly remove an already present header and reinsert
409 ;; it somewhere else afterwards.
410 (when (or ask invalid)
411 (gnus-diary-kill-entire-line))
413 ;; Now, loop until a valid value is provided:
414 (while (or ask (not value) invalid)
415 (let ((prompt (concat (and invalid
416 (prog1 "(current value invalid) "
419 (and (not value) " (defaults to `*')")
422 (if (listp (nth 1 head))
423 (completing-read prompt (cons '("*" nil) (nth 1 head))
425 gnus-diary-header-value-history "*")
426 (read-string prompt value
427 gnus-diary-header-value-history "*"))))
431 (nndiary-parse-schedule-value value
432 (nth 1 head) (nth 2 head))
435 (gnus-diary-add-header (concat header ": " value))
440 (add-hook 'nndiary-request-accept-article-hooks
441 (lambda () (gnus-diary-check-message nil)))
443 (define-key message-mode-map "\C-cDc" 'gnus-diary-check-message)
444 (define-key gnus-article-edit-mode-map "\C-cDc" 'gnus-diary-check-message)
447 ;; The end ==================================================================
449 (defun gnus-diary-version ()
450 "Current Diary backend version."
452 (message "NNDiary version %s" nndiary-version))
454 (define-key message-mode-map "\C-cDv" 'gnus-diary-version)
455 (define-key gnus-article-edit-mode-map "\C-cDv" 'gnus-diary-version)
458 (provide 'gnus-diary)
460 ;;; gnus-diary.el ends here