lisp/gnus/nndiary.el

   1 ;;; nndiary.el --- A diary back end for Gnus
   2
   3 ;; Copyright (C) 1999-2014 Free Software Foundation, Inc.
   4
   5 ;; Author:        Didier Verna <didier@xemacs.org>
   6 ;; Maintainer:    Didier Verna <didier@xemacs.org>
   7 ;; Created:       Fri Jul 16 18:55:42 1999
   8 ;; Keywords:      calendar mail news
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25
  26 ;;; Commentary:
  27
  28 ;; Contents management by FCM version 0.1.
  29
  30 ;; Description:
  31 ;; ===========
  32
  33 ;; nndiary is a mail back end designed to handle mails as diary event
  34 ;; reminders. It is now fully documented in the Gnus manual.
  35
  36
  37 ;; Bugs / Todo:
  38 ;; ===========
  39
  40 ;; * Respooling doesn't work because contrary to the request-scan function,
  41 ;;   Gnus won't allow me to override the split methods when calling the
  42 ;;   respooling back end functions.
  43 ;; * There's a bug in the time zone mechanism with variable TZ locations.
  44 ;; * We could allow a keyword like `ask' in X-Diary-* headers, that would mean
  45 ;;   "ask for value upon reception of the message".
  46 ;; * We could add an optional header X-Diary-Reminders to specify a special
  47 ;;   reminders value for this message. Suggested by Jody Klymak.
  48 ;; * We should check messages validity in other circumstances than just
  49 ;;   moving an article from somewhere else (request-accept). For instance,
  50 ;;   when editing / saving and so on.
  51
  52
  53 ;; Remarks:
  54 ;; =======
  55
  56 ;; * nnoo. NNDiary is very similar to nnml. This makes the idea of using nnoo
  57 ;;   (to derive nndiary from nnml) natural. However, my experience with nnoo
  58 ;;   is that for reasonably complex back ends like this one, nnoo is a burden
  59 ;;   rather than an help. It's tricky to use, not everything can be inherited,
  60 ;;   what can be inherited and when is not very clear, and you've got to be
  61 ;;   very careful because a little mistake can fuck up your other back ends,
  62 ;;   especially because their variables will be use instead of your real ones.
  63 ;;   Finally, I found it easier to just clone the needed parts of nnml, and
  64 ;;   tracking nnml updates is not a big deal.
  65
  66 ;;   IMHO, nnoo is actually badly designed.  A much simpler, and yet more
  67 ;;   powerful one would be to make *real* functions and variables for a new
  68 ;;   back end based on another. Lisp is a reflexive language so that's a very
  69 ;;   easy thing to do: inspect the function's form, replace occurrences of
  70 ;;   <nnfrom> (even in strings) with <nnto>, and you're done.
  71
  72 ;; * nndiary-get-new-mail, nndiary-mail-source and nndiary-split-methods:
  73 ;;   NNDiary has some experimental parts, in the sense Gnus normally uses only
  74 ;;   one mail back ends for mail retrieval and splitting. This back end is
  75 ;;   also an attempt to make it behave differently. For Gnus developers: as
  76 ;;   you can see if you snarf into the code, that was not a very difficult
  77 ;;   thing to do. Something should be done about the respooling breakage
  78 ;;   though.
  79
  80
  81 ;;; Code:
  82
  83 (require 'nnoo)
  84 (require 'nnheader)
  85 (require 'nnmail)
  86 (eval-when-compile (require 'cl))
  87
  88 (require 'gnus-start)
  89 (require 'gnus-sum)
  90
  91 ;; Compatibility Functions  =================================================
  92
  93 (eval-and-compile
  94   (if (fboundp 'signal-error)
  95       (defun nndiary-error (&rest args)
  96         (apply #'signal-error 'nndiary args))
  97     (defun nndiary-error (&rest args)
  98       (apply #'error args))))
  99
 100
 101 ;; Back End behavior customization ===========================================
 102
 103 (defgroup nndiary nil
 104   "The Gnus Diary back end."
 105   :version "22.1"
 106   :group 'gnus-diary)
 107
 108 (defcustom nndiary-mail-sources
 109   `((file :path ,(expand-file-name "~/.nndiary")))
 110   "*NNDiary specific mail sources.
 111 This variable is used by nndiary in place of the standard `mail-sources'
 112 variable when `nndiary-get-new-mail' is set to non-nil.  These sources
 113 must contain diary messages ONLY."
 114   :group 'nndiary
 115   :group 'mail-source
 116   :type 'sexp)
 117
 118 (defcustom nndiary-split-methods '(("diary" ""))
 119   "*NNDiary specific split methods.
 120 This variable is used by nndiary in place of the standard
 121 `nnmail-split-methods' variable when `nndiary-get-new-mail' is set to
 122 non-nil."
 123   :group 'nndiary
 124   :group 'nnmail-split
 125   :type '(choice (repeat :tag "Alist" (group (string :tag "Name") regexp))
 126                  (function-item nnmail-split-fancy)
 127                  (function :tag "Other")))
 128
 129
 130 (defcustom nndiary-reminders '((0 . day))
 131   "*Different times when you want to be reminded of your appointments.
 132 Diary articles will appear again, as if they'd been just received.
 133
 134 Entries look like (3 . day) which means something like \"Please
 135 Hortense, would you be so kind as to remind me of my appointments 3 days
 136 before the date, thank you very much. Anda, hmmm... by the way, are you
 137 doing anything special tonight ?\".
 138
 139 The units of measure are 'minute 'hour 'day 'week 'month and 'year (no,
 140 not 'century, sorry).
 141
 142 NOTE: the units of measure actually express dates, not durations: if you
 143 use 'week, messages will pop up on Sundays at 00:00 (or Mondays if
 144 `nndiary-week-starts-on-monday' is non-nil) and *not* 7 days before the
 145 appointment, if you use 'month, messages will pop up on the first day of
 146 each months, at 00:00 and so on.
 147
 148 If you really want to specify a duration (like 24 hours exactly), you can
 149 use the equivalent in minutes (the smallest unit).  A fuzz of 60 seconds
 150 maximum in the reminder is not that painful, I think.  Although this
 151 scheme might appear somewhat weird at a first glance, it is very powerful.
 152 In order to make this clear, here are some examples:
 153
 154 - '(0 . day): this is the default value of `nndiary-reminders'.  It means
 155   pop up the appointments of the day each morning at 00:00.
 156
 157 - '(1 . day): this means pop up the appointments the day before, at 00:00.
 158
 159 - '(6 . hour): for an appointment at 18:30, this would pop up the
 160   appointment message at 12:00.
 161
 162 - '(360 . minute): for an appointment at 18:30 and 15 seconds, this would
 163   pop up the appointment message at 12:30."
 164   :group 'nndiary
 165   :type '(repeat (cons :format "%v\n"
 166                        (integer :format "%v")
 167                        (choice :format "%[%v(s)%] before...\n"
 168                                :value day
 169                                (const :format "%v" minute)
 170                                (const :format "%v" hour)
 171                                (const :format "%v" day)
 172                                (const :format "%v" week)
 173                                (const :format "%v" month)
 174                                (const :format "%v" year)))))
 175
 176 (defcustom nndiary-week-starts-on-monday nil
 177   "*Whether a week starts on monday (otherwise, sunday)."
 178   :type 'boolean
 179   :group 'nndiary)
 180
 181
 182 (define-obsolete-variable-alias 'nndiary-request-create-group-hooks
 183   'nndiary-request-create-group-functions "24.3")
 184 (defcustom nndiary-request-create-group-functions nil
 185   "*Hook run after `nndiary-request-create-group' is executed.
 186 The hook functions will be called with the full group name as argument."
 187   :group 'nndiary
 188   :type 'hook)
 189
 190 (define-obsolete-variable-alias 'nndiary-request-update-info-hooks
 191   'nndiary-request-update-info-functions "24.3")
 192 (defcustom nndiary-request-update-info-functions nil
 193   "*Hook run after `nndiary-request-update-info-group' is executed.
 194 The hook functions will be called with the full group name as argument."
 195   :group 'nndiary
 196   :type 'hook)
 197
 198 (define-obsolete-variable-alias 'nndiary-request-accept-article-hooks
 199   'nndiary-request-accept-article-functions "24.3")
 200 (defcustom nndiary-request-accept-article-functions nil
 201   "*Hook run before accepting an article.
 202 Executed near the beginning of `nndiary-request-accept-article'.
 203 The hook functions will be called with the article in the current buffer."
 204   :group 'nndiary
 205   :type 'hook)
 206
 207 (defcustom nndiary-check-directory-twice t
 208   "*If t, check directories twice to avoid NFS failures."
 209   :group 'nndiary
 210   :type 'boolean)
 211
 212
 213 ;; Back End declaration ======================================================
 214
 215 ;; Well, most of this is nnml clonage.
 216
 217 (nnoo-declare nndiary)
 218
 219 (defvoo nndiary-directory (nnheader-concat gnus-directory "diary/")
 220   "Spool directory for the nndiary back end.")
 221
 222 (defvoo nndiary-active-file
 223     (expand-file-name "active" nndiary-directory)
 224   "Active file for the nndiary back end.")
 225
 226 (defvoo nndiary-newsgroups-file
 227     (expand-file-name "newsgroups" nndiary-directory)
 228   "Newsgroups description file for the nndiary back end.")
 229
 230 (defvoo nndiary-get-new-mail nil
 231   "Whether nndiary gets new mail and split it.
 232 Contrary to traditional mail back ends, this variable can be set to t
 233 even if your primary mail back end also retrieves mail. In such a case,
 234 NDiary uses its own mail-sources and split-methods.")
 235
 236 (defvoo nndiary-nov-is-evil nil
 237   "If non-nil, Gnus will never use nov databases for nndiary groups.
 238 Using nov databases will speed up header fetching considerably.
 239 This variable shouldn't be flipped much.  If you have, for some reason,
 240 set this to t, and want to set it to nil again, you should always run
 241 the `nndiary-generate-nov-databases' command.  The function will go
 242 through all nnml directories and generate nov databases for them
 243 all.  This may very well take some time.")
 244
 245 (defvoo nndiary-prepare-save-mail-hook nil
 246   "*Hook run narrowed to an article before saving.")
 247
 248 (defvoo nndiary-inhibit-expiry nil
 249   "If non-nil, inhibit expiry.")
 250
 251 \f
 252
 253 (defconst nndiary-version "0.2-b14"
 254   "Current Diary back end version.")
 255
 256 (defun nndiary-version ()
 257   "Current Diary back end version."
 258   (interactive)
 259   (message "NNDiary version %s" nndiary-version))
 260
 261 (defvoo nndiary-nov-file-name ".overview")
 262
 263 (defvoo nndiary-current-directory nil)
 264 (defvoo nndiary-current-group nil)
 265 (defvoo nndiary-status-string "" )
 266 (defvoo nndiary-nov-buffer-alist nil)
 267 (defvoo nndiary-group-alist nil)
 268 (defvoo nndiary-active-timestamp nil)
 269 (defvoo nndiary-article-file-alist nil)
 270
 271 (defvoo nndiary-generate-active-function 'nndiary-generate-active-info)
 272 (defvoo nndiary-nov-buffer-file-name nil)
 273 (defvoo nndiary-file-coding-system nnmail-file-coding-system)
 274
 275 (defconst nndiary-headers
 276   '(("Minute" 0 59)
 277     ("Hour" 0 23)
 278     ("Dom" 1 31)
 279     ("Month" 1 12)
 280     ("Year" 1971)
 281     ("Dow" 0 6)
 282     ("Time-Zone" (("Y" -43200)
 283
 284                   ("X" -39600)
 285
 286                   ("W" -36000)
 287
 288                   ("V" -32400)
 289
 290                   ("U" -28800)
 291                   ("PST" -28800)
 292
 293                   ("T"   -25200)
 294                   ("MST" -25200)
 295                   ("PDT" -25200)
 296
 297                   ("S"   -21600)
 298                   ("CST" -21600)
 299                   ("MDT" -21600)
 300
 301                   ("R"   -18000)
 302                   ("EST" -18000)
 303                   ("CDT" -18000)
 304
 305                   ("Q"   -14400)
 306                   ("AST" -14400)
 307                   ("EDT" -14400)
 308
 309                   ("P"   -10800)
 310                   ("ADT" -10800)
 311
 312                   ("O" -7200)
 313
 314                   ("N" -3600)
 315
 316                   ("Z"   0)
 317                   ("GMT" 0)
 318                   ("UT"  0)
 319                   ("UTC" 0)
 320                   ("WET" 0)
 321
 322                   ("A"    3600)
 323                   ("CET"  3600)
 324                   ("MET"  3600)
 325                   ("MEZ"  3600)
 326                   ("BST"  3600)
 327                   ("WEST" 3600)
 328
 329                   ("B"    7200)
 330                   ("EET"  7200)
 331                   ("CEST" 7200)
 332                   ("MEST" 7200)
 333                   ("MESZ" 7200)
 334
 335                   ("C" 10800)
 336
 337                   ("D" 14400)
 338
 339                   ("E" 18000)
 340
 341                   ("F" 21600)
 342
 343                   ("G" 25200)
 344
 345                   ("H" 28800)
 346
 347                   ("I"   32400)
 348                   ("JST" 32400)
 349
 350                   ("K"   36000)
 351                   ("GST" 36000)
 352
 353                   ("L" 39600)
 354
 355                   ("M"    43200)
 356                   ("NZST" 43200)
 357
 358                   ("NZDT" 46800))))
 359   ;; List of NNDiary headers that specify the time spec. Each header name is
 360   ;; followed by either two integers (specifying a range of possible values
 361   ;; for this header) or one list (specifying all the possible values for this
 362   ;; header). In the latter case, the list does NOT include the unspecified
 363   ;; spec (*).
 364   ;; For time zone values, we have symbolic time zone names associated with
 365   ;; the (relative) number of seconds ahead GMT.
 366   )
 367
 368 (defsubst nndiary-schedule ()
 369   (let (head)
 370     (condition-case arg
 371         (mapcar
 372          (lambda (elt)
 373            (setq head (nth 0 elt))
 374            (nndiary-parse-schedule (nth 0 elt) (nth 1 elt) (nth 2 elt)))
 375          nndiary-headers)
 376       (error
 377        (nnheader-report 'nndiary "X-Diary-%s header parse error: %s."
 378                         head (cdr arg))
 379        nil))
 380     ))
 381
 382 ;;; Interface functions =====================================================
 383
 384 (nnoo-define-basics nndiary)
 385
 386 (deffoo nndiary-retrieve-headers (sequence &optional group server fetch-old)
 387   (when (nndiary-possibly-change-directory group server)
 388     (with-current-buffer nntp-server-buffer
 389       (erase-buffer)
 390       (let* ((file nil)
 391              (number (length sequence))
 392              (count 0)
 393              (file-name-coding-system nnmail-pathname-coding-system)
 394              beg article
 395              (nndiary-check-directory-twice
 396               (and nndiary-check-directory-twice
 397                    ;; To speed up, disable it in some case.
 398                    (or (not (numberp nnmail-large-newsgroup))
 399                        (<= number nnmail-large-newsgroup)))))
 400         (if (stringp (car sequence))
 401             'headers
 402           (if (nndiary-retrieve-headers-with-nov sequence fetch-old)
 403               'nov
 404             (while sequence
 405               (setq article (car sequence))
 406               (setq file (nndiary-article-to-file article))
 407               (when (and file
 408                          (file-exists-p file)
 409                          (not (file-directory-p file)))
 410                 (insert (format "221 %d Article retrieved.\n" article))
 411                 (setq beg (point))
 412                 (nnheader-insert-head file)
 413                 (goto-char beg)
 414                 (if (search-forward "\n\n" nil t)
 415                     (forward-char -1)
 416                   (goto-char (point-max))
 417                   (insert "\n\n"))
 418                 (insert ".\n")
 419                 (delete-region (point) (point-max)))
 420               (setq sequence (cdr sequence))
 421               (setq count (1+ count))
 422               (and (numberp nnmail-large-newsgroup)
 423                    (> number nnmail-large-newsgroup)
 424                    (zerop (% count 20))
 425                    (nnheader-message 6 "nndiary: Receiving headers... %d%%"
 426                                      (/ (* count 100) number))))
 427
 428             (and (numberp nnmail-large-newsgroup)
 429                  (> number nnmail-large-newsgroup)
 430                  (nnheader-message 6 "nndiary: Receiving headers...done"))
 431
 432             (nnheader-fold-continuation-lines)
 433             'headers))))))
 434
 435 (deffoo nndiary-open-server (server &optional defs)
 436   (nnoo-change-server 'nndiary server defs)
 437   (when (not (file-exists-p nndiary-directory))
 438     (ignore-errors (make-directory nndiary-directory t)))
 439   (cond
 440    ((not (file-exists-p nndiary-directory))
 441     (nndiary-close-server)
 442     (nnheader-report 'nndiary "Couldn't create directory: %s"
 443                      nndiary-directory))
 444    ((not (file-directory-p (file-truename nndiary-directory)))
 445     (nndiary-close-server)
 446     (nnheader-report 'nndiary "Not a directory: %s" nndiary-directory))
 447    (t
 448     (nnheader-report 'nndiary "Opened server %s using directory %s"
 449                      server nndiary-directory)
 450     t)))
 451
 452 (deffoo nndiary-request-regenerate (server)
 453   (nndiary-possibly-change-directory nil server)
 454   (nndiary-generate-nov-databases server)
 455   t)
 456
 457 (deffoo nndiary-request-article (id &optional group server buffer)
 458   (nndiary-possibly-change-directory group server)
 459   (let* ((nntp-server-buffer (or buffer nntp-server-buffer))
 460          (file-name-coding-system nnmail-pathname-coding-system)
 461          path gpath group-num)
 462     (if (stringp id)
 463         (when (and (setq group-num (nndiary-find-group-number id))
 464                    (cdr
 465                     (assq (cdr group-num)
 466                           (nnheader-article-to-file-alist
 467                            (setq gpath
 468                                  (nnmail-group-pathname
 469                                   (car group-num)
 470                                   nndiary-directory))))))
 471           (setq path (concat gpath (int-to-string (cdr group-num)))))
 472       (setq path (nndiary-article-to-file id)))
 473     (cond
 474      ((not path)
 475       (nnheader-report 'nndiary "No such article: %s" id))
 476      ((not (file-exists-p path))
 477       (nnheader-report 'nndiary "No such file: %s" path))
 478      ((file-directory-p path)
 479       (nnheader-report 'nndiary "File is a directory: %s" path))
 480      ((not (save-excursion (let ((nnmail-file-coding-system
 481                                   nndiary-file-coding-system))
 482                              (nnmail-find-file path))))
 483       (nnheader-report 'nndiary "Couldn't read file: %s" path))
 484      (t
 485       (nnheader-report 'nndiary "Article %s retrieved" id)
 486       ;; We return the article number.
 487       (cons (if group-num (car group-num) group)
 488             (string-to-number (file-name-nondirectory path)))))))
 489
 490 (deffoo nndiary-request-group (group &optional server dont-check info)
 491   (let ((file-name-coding-system nnmail-pathname-coding-system))
 492     (cond
 493      ((not (nndiary-possibly-change-directory group server))
 494       (nnheader-report 'nndiary "Invalid group (no such directory)"))
 495      ((not (file-exists-p nndiary-current-directory))
 496       (nnheader-report 'nndiary "Directory %s does not exist"
 497                        nndiary-current-directory))
 498      ((not (file-directory-p nndiary-current-directory))
 499       (nnheader-report 'nndiary "%s is not a directory"
 500                        nndiary-current-directory))
 501      (dont-check
 502       (nnheader-report 'nndiary "Group %s selected" group)
 503       t)
 504      (t
 505       (nnheader-re-read-dir nndiary-current-directory)
 506       (nnmail-activate 'nndiary)
 507       (let ((active (nth 1 (assoc group nndiary-group-alist))))
 508         (if (not active)
 509             (nnheader-report 'nndiary "No such group: %s" group)
 510           (nnheader-report 'nndiary "Selected group %s" group)
 511           (nnheader-insert "211 %d %d %d %s\n"
 512                            (max (1+ (- (cdr active) (car active))) 0)
 513                            (car active) (cdr active) group)))))))
 514
 515 (deffoo nndiary-request-scan (&optional group server)
 516   ;; Use our own mail sources and split methods while Gnus doesn't let us have
 517   ;; multiple back ends for retrieving mail.
 518   (let ((mail-sources nndiary-mail-sources)
 519         (nnmail-split-methods nndiary-split-methods))
 520     (setq nndiary-article-file-alist nil)
 521     (nndiary-possibly-change-directory group server)
 522     (nnmail-get-new-mail 'nndiary 'nndiary-save-nov nndiary-directory group)))
 523
 524 (deffoo nndiary-close-group (group &optional server)
 525   (setq nndiary-article-file-alist nil)
 526   t)
 527
 528 (deffoo nndiary-request-create-group (group &optional server args)
 529   (nndiary-possibly-change-directory nil server)
 530   (nnmail-activate 'nndiary)
 531   (cond
 532    ((assoc group nndiary-group-alist)
 533     t)
 534    ((and (file-exists-p (nnmail-group-pathname group nndiary-directory))
 535          (not (file-directory-p (nnmail-group-pathname
 536                                  group nndiary-directory))))
 537     (nnheader-report 'nndiary "%s is a file"
 538                      (nnmail-group-pathname group nndiary-directory)))
 539    (t
 540     (let (active)
 541       (push (list group (setq active (cons 1 0)))
 542             nndiary-group-alist)
 543       (nndiary-possibly-create-directory group)
 544       (nndiary-possibly-change-directory group server)
 545       (let ((articles (nnheader-directory-articles nndiary-current-directory)))
 546         (when articles
 547           (setcar active (apply 'min articles))
 548           (setcdr active (apply 'max articles))))
 549       (nnmail-save-active nndiary-group-alist nndiary-active-file)
 550       (run-hook-with-args 'nndiary-request-create-group-functions
 551                           (gnus-group-prefixed-name group
 552                                                     (list "nndiary" server)))
 553       t))
 554    ))
 555
 556 (deffoo nndiary-request-list (&optional server)
 557   (save-excursion
 558     (let ((nnmail-file-coding-system nnmail-active-file-coding-system)
 559           (file-name-coding-system nnmail-pathname-coding-system))
 560       (nnmail-find-file nndiary-active-file))
 561     (setq nndiary-group-alist (nnmail-get-active))
 562     t))
 563
 564 (deffoo nndiary-request-newgroups (date &optional server)
 565   (nndiary-request-list server))
 566
 567 (deffoo nndiary-request-list-newsgroups (&optional server)
 568   (save-excursion
 569     (nnmail-find-file nndiary-newsgroups-file)))
 570
 571 (deffoo nndiary-request-expire-articles (articles group &optional server force)
 572   (nndiary-possibly-change-directory group server)
 573   (let ((active-articles
 574          (nnheader-directory-articles nndiary-current-directory))
 575         article rest number)
 576     (nnmail-activate 'nndiary)
 577     ;; Articles not listed in active-articles are already gone,
 578     ;; so don't try to expire them.
 579     (setq articles (gnus-intersection articles active-articles))
 580     (while articles
 581       (setq article (nndiary-article-to-file (setq number (pop articles))))
 582       (if (and (nndiary-deletable-article-p group number)
 583                ;; Don't use nnmail-expired-article-p. Our notion of expiration
 584                ;; is a bit peculiar ...
 585                (or force (nndiary-expired-article-p article)))
 586           (progn
 587             ;; Allow a special target group.
 588             (unless (eq nnmail-expiry-target 'delete)
 589               (with-temp-buffer
 590                 (nndiary-request-article number group server (current-buffer))
 591                 (let ((nndiary-current-directory nil))
 592                   (nnmail-expiry-target-group nnmail-expiry-target group)))
 593               (nndiary-possibly-change-directory group server))
 594             (nnheader-message 5 "Deleting article %s in %s" number group)
 595             (condition-case ()
 596                 (funcall nnmail-delete-file-function article)
 597               (file-error (push number rest)))
 598             (setq active-articles (delq number active-articles))
 599             (nndiary-nov-delete-article group number))
 600         (push number rest)))
 601     (let ((active (nth 1 (assoc group nndiary-group-alist))))
 602       (when active
 603         (setcar active (or (and active-articles
 604                                 (apply 'min active-articles))
 605                            (1+ (cdr active)))))
 606       (nnmail-save-active nndiary-group-alist nndiary-active-file))
 607     (nndiary-save-nov)
 608     (nconc rest articles)))
 609
 610 (deffoo nndiary-request-move-article
 611     (article group server accept-form &optional last move-is-internal)
 612   (let ((buf (get-buffer-create " *nndiary move*"))
 613         result)
 614     (nndiary-possibly-change-directory group server)
 615     (nndiary-update-file-alist)
 616     (and
 617      (nndiary-deletable-article-p group article)
 618      (nndiary-request-article article group server)
 619      (let (nndiary-current-directory
 620            nndiary-current-group
 621            nndiary-article-file-alist)
 622        (with-current-buffer buf
 623          (insert-buffer-substring nntp-server-buffer)
 624          (setq result (eval accept-form))
 625          (kill-buffer (current-buffer))
 626          result))
 627      (progn
 628        (nndiary-possibly-change-directory group server)
 629        (condition-case ()
 630            (funcall nnmail-delete-file-function
 631                     (nndiary-article-to-file  article))
 632          (file-error nil))
 633        (nndiary-nov-delete-article group article)
 634        (when last
 635          (nndiary-save-nov)
 636          (nnmail-save-active nndiary-group-alist nndiary-active-file))))
 637     result))
 638
 639 (deffoo nndiary-request-accept-article (group &optional server last)
 640   (nndiary-possibly-change-directory group server)
 641   (nnmail-check-syntax)
 642   (run-hooks 'nndiary-request-accept-article-functions)
 643   (when (nndiary-schedule)
 644     (let (result)
 645       (when nnmail-cache-accepted-message-ids
 646         (nnmail-cache-insert (nnmail-fetch-field "message-id")
 647                              group
 648                              (nnmail-fetch-field "subject")))
 649       (if (stringp group)
 650           (and
 651            (nnmail-activate 'nndiary)
 652            (setq result
 653                  (car (nndiary-save-mail
 654                        (list (cons group (nndiary-active-number group))))))
 655            (progn
 656              (nnmail-save-active nndiary-group-alist nndiary-active-file)
 657              (and last (nndiary-save-nov))))
 658         (and
 659          (nnmail-activate 'nndiary)
 660          (if (and (not (setq result
 661                              (nnmail-article-group 'nndiary-active-number)))
 662                   (yes-or-no-p "Moved to `junk' group; delete article? "))
 663              (setq result 'junk)
 664            (setq result (car (nndiary-save-mail result))))
 665          (when last
 666            (nnmail-save-active nndiary-group-alist nndiary-active-file)
 667            (when nnmail-cache-accepted-message-ids
 668              (nnmail-cache-close))
 669            (nndiary-save-nov))))
 670       result))
 671   )
 672
 673 (deffoo nndiary-request-post (&optional server)
 674   (nnmail-do-request-post 'nndiary-request-accept-article server))
 675
 676 (deffoo nndiary-request-replace-article (article group buffer)
 677   (nndiary-possibly-change-directory group)
 678   (with-current-buffer buffer
 679     (nndiary-possibly-create-directory group)
 680     (let ((chars (nnmail-insert-lines))
 681           (art (concat (int-to-string article) "\t"))
 682           headers)
 683       (when (ignore-errors
 684               (nnmail-write-region
 685                (point-min) (point-max)
 686                (or (nndiary-article-to-file article)
 687                    (expand-file-name (int-to-string article)
 688                                      nndiary-current-directory))
 689                nil (if (nnheader-be-verbose 5) nil 'nomesg))
 690               t)
 691         (setq headers (nndiary-parse-head chars article))
 692         ;; Replace the NOV line in the NOV file.
 693         (with-current-buffer (nndiary-open-nov group)
 694           (goto-char (point-min))
 695           (if (or (looking-at art)
 696                   (search-forward (concat "\n" art) nil t))
 697               ;; Delete the old NOV line.
 698               (delete-region (progn (beginning-of-line) (point))
 699                              (progn (forward-line 1) (point)))
 700             ;; The line isn't here, so we have to find out where
 701             ;; we should insert it.  (This situation should never
 702             ;; occur, but one likes to make sure...)
 703             (while (and (looking-at "[0-9]+\t")
 704                         (< (string-to-number
 705                             (buffer-substring
 706                              (match-beginning 0) (match-end 0)))
 707                            article)
 708                         (zerop (forward-line 1)))))
 709           (beginning-of-line)
 710           (nnheader-insert-nov headers)
 711           (nndiary-save-nov)
 712           t)))))
 713
 714 (deffoo nndiary-request-delete-group (group &optional force server)
 715   (nndiary-possibly-change-directory group server)
 716   (when force
 717     ;; Delete all articles in GROUP.
 718     (let ((articles
 719            (directory-files
 720             nndiary-current-directory t
 721             (concat nnheader-numerical-short-files
 722                     "\\|" (regexp-quote nndiary-nov-file-name) "$")))
 723           article)
 724       (while articles
 725         (setq article (pop articles))
 726         (when (file-writable-p article)
 727           (nnheader-message 5 "Deleting article %s in %s..." article group)
 728           (funcall nnmail-delete-file-function article))))
 729     ;; Try to delete the directory itself.
 730     (ignore-errors (delete-directory nndiary-current-directory)))
 731   ;; Remove the group from all structures.
 732   (setq nndiary-group-alist
 733         (delq (assoc group nndiary-group-alist) nndiary-group-alist)
 734         nndiary-current-group nil
 735         nndiary-current-directory nil)
 736   ;; Save the active file.
 737   (nnmail-save-active nndiary-group-alist nndiary-active-file)
 738   t)
 739
 740 (deffoo nndiary-request-rename-group (group new-name &optional server)
 741   (nndiary-possibly-change-directory group server)
 742   (let ((new-dir (nnmail-group-pathname new-name nndiary-directory))
 743         (old-dir (nnmail-group-pathname group nndiary-directory)))
 744     (when (ignore-errors
 745             (make-directory new-dir t)
 746             t)
 747       ;; We move the articles file by file instead of renaming
 748       ;; the directory -- there may be subgroups in this group.
 749       ;; One might be more clever, I guess.
 750       (let ((files (nnheader-article-to-file-alist old-dir)))
 751         (while files
 752           (rename-file
 753            (concat old-dir (cdar files))
 754            (concat new-dir (cdar files)))
 755           (pop files)))
 756       ;; Move .overview file.
 757       (let ((overview (concat old-dir nndiary-nov-file-name)))
 758         (when (file-exists-p overview)
 759           (rename-file overview (concat new-dir nndiary-nov-file-name))))
 760       (when (<= (length (directory-files old-dir)) 2)
 761         (ignore-errors (delete-directory old-dir)))
 762       ;; That went ok, so we change the internal structures.
 763       (let ((entry (assoc group nndiary-group-alist)))
 764         (when entry
 765           (setcar entry new-name))
 766         (setq nndiary-current-directory nil
 767               nndiary-current-group nil)
 768         ;; Save the new group alist.
 769         (nnmail-save-active nndiary-group-alist nndiary-active-file)
 770         t))))
 771
 772 (deffoo nndiary-set-status (article name value &optional group server)
 773   (nndiary-possibly-change-directory group server)
 774   (let ((file (nndiary-article-to-file article)))
 775     (cond
 776      ((not (file-exists-p file))
 777       (nnheader-report 'nndiary "File %s does not exist" file))
 778      (t
 779       (with-temp-file file
 780         (nnheader-insert-file-contents file)
 781         (nnmail-replace-status name value))
 782       t))))
 783
 784 \f
 785 ;;; Interface optional functions ============================================
 786
 787 (deffoo nndiary-request-update-info (group info &optional server)
 788   (nndiary-possibly-change-directory group)
 789   (let ((timestamp (gnus-group-parameter-value (gnus-info-params info)
 790                                                'timestamp t)))
 791     (if (not timestamp)
 792         (nnheader-report 'nndiary "Group %s doesn't have a timestamp" group)
 793       ;; else
 794       ;; Figure out which articles should be re-new'ed
 795       (let ((articles (nndiary-flatten (gnus-info-read info) 0))
 796             article file unread buf)
 797         (save-excursion
 798           (setq buf (nnheader-set-temp-buffer " *nndiary update*"))
 799           (while (setq article (pop articles))
 800             (setq file (concat nndiary-current-directory
 801                                (int-to-string article)))
 802             (and (file-exists-p file)
 803                  (nndiary-renew-article-p file timestamp)
 804                  (push article unread)))
 805           ;;(message "unread: %s" unread)
 806           (sit-for 1)
 807           (kill-buffer buf))
 808         (setq unread (sort unread '<))
 809         (and unread
 810              (gnus-info-set-read info (gnus-update-read-articles
 811                                        (gnus-info-group info) unread t)))
 812         ))
 813     (run-hook-with-args 'nndiary-request-update-info-functions
 814                         (gnus-info-group info))
 815     t))
 816
 817
 818 \f
 819 ;;; Internal functions ======================================================
 820
 821 (defun nndiary-article-to-file (article)
 822   (nndiary-update-file-alist)
 823   (let (file)
 824     (if (setq file (cdr (assq article nndiary-article-file-alist)))
 825         (expand-file-name file nndiary-current-directory)
 826       ;; Just to make sure nothing went wrong when reading over NFS --
 827       ;; check once more.
 828       (if nndiary-check-directory-twice
 829           (when (file-exists-p
 830                  (setq file (expand-file-name (number-to-string article)
 831                                               nndiary-current-directory)))
 832             (nndiary-update-file-alist t)
 833             file)))))
 834
 835 (defun nndiary-deletable-article-p (group article)
 836   "Say whether ARTICLE in GROUP can be deleted."
 837   (let (path)
 838     (when (setq path (nndiary-article-to-file article))
 839       (when (file-writable-p path)
 840         (or (not nnmail-keep-last-article)
 841             (not (eq (cdr (nth 1 (assoc group nndiary-group-alist)))
 842                      article)))))))
 843
 844 ;; Find an article number in the current group given the Message-ID.
 845 (defun nndiary-find-group-number (id)
 846   (with-current-buffer (get-buffer-create " *nndiary id*")
 847     (let ((alist nndiary-group-alist)
 848           number)
 849       ;; We want to look through all .overview files, but we want to
 850       ;; start with the one in the current directory.  It seems most
 851       ;; likely that the article we are looking for is in that group.
 852       (if (setq number (nndiary-find-id nndiary-current-group id))
 853           (cons nndiary-current-group number)
 854         ;; It wasn't there, so we look through the other groups as well.
 855         (while (and (not number)
 856                     alist)
 857           (or (string= (caar alist) nndiary-current-group)
 858               (setq number (nndiary-find-id (caar alist) id)))
 859           (or number
 860               (setq alist (cdr alist))))
 861         (and number
 862              (cons (caar alist) number))))))
 863
 864 (defun nndiary-find-id (group id)
 865   (erase-buffer)
 866   (let ((nov (expand-file-name nndiary-nov-file-name
 867                                (nnmail-group-pathname group
 868                                                       nndiary-directory)))
 869         number found)
 870     (when (file-exists-p nov)
 871       (nnheader-insert-file-contents nov)
 872       (while (and (not found)
 873                   (search-forward id nil t)) ; We find the ID.
 874         ;; And the id is in the fourth field.
 875         (if (not (and (search-backward "\t" nil t 4)
 876                       (not (search-backward"\t" (point-at-bol) t))))
 877             (forward-line 1)
 878           (beginning-of-line)
 879           (setq found t)
 880           ;; We return the article number.
 881           (setq number
 882                 (ignore-errors (read (current-buffer))))))
 883       number)))
 884
 885 (defun nndiary-retrieve-headers-with-nov (articles &optional fetch-old)
 886   (if (or gnus-nov-is-evil nndiary-nov-is-evil)
 887       nil
 888     (let ((nov (expand-file-name nndiary-nov-file-name
 889                                  nndiary-current-directory)))
 890       (when (file-exists-p nov)
 891         (with-current-buffer nntp-server-buffer
 892           (erase-buffer)
 893           (nnheader-insert-file-contents nov)
 894           (if (and fetch-old
 895                    (not (numberp fetch-old)))
 896               t                         ; Don't remove anything.
 897             (nnheader-nov-delete-outside-range
 898              (if fetch-old (max 1 (- (car articles) fetch-old))
 899                (car articles))
 900              (car (last articles)))
 901             t))))))
 902
 903 (defun nndiary-possibly-change-directory (group &optional server)
 904   (when (and server
 905              (not (nndiary-server-opened server)))
 906     (nndiary-open-server server))
 907   (if (not group)
 908       t
 909     (let ((pathname (nnmail-group-pathname group nndiary-directory))
 910           (file-name-coding-system nnmail-pathname-coding-system))
 911       (when (not (equal pathname nndiary-current-directory))
 912         (setq nndiary-current-directory pathname
 913               nndiary-current-group group
 914               nndiary-article-file-alist nil))
 915       (file-exists-p nndiary-current-directory))))
 916
 917 (defun nndiary-possibly-create-directory (group)
 918   (let ((dir (nnmail-group-pathname group nndiary-directory)))
 919     (unless (file-exists-p dir)
 920       (make-directory (directory-file-name dir) t)
 921       (nnheader-message 5 "Creating mail directory %s" dir))))
 922
 923 (defun nndiary-save-mail (group-art)
 924   "Called narrowed to an article."
 925   (let (chars headers)
 926     (setq chars (nnmail-insert-lines))
 927     (nnmail-insert-xref group-art)
 928     (run-hooks 'nnmail-prepare-save-mail-hook)
 929     (run-hooks 'nndiary-prepare-save-mail-hook)
 930     (goto-char (point-min))
 931     (while (looking-at "From ")
 932       (replace-match "X-From-Line: ")
 933       (forward-line 1))
 934     ;; We save the article in all the groups it belongs in.
 935     (let ((ga group-art)
 936           first)
 937       (while ga
 938         (nndiary-possibly-create-directory (caar ga))
 939         (let ((file (concat (nnmail-group-pathname
 940                              (caar ga) nndiary-directory)
 941                             (int-to-string (cdar ga)))))
 942           (if first
 943               ;; It was already saved, so we just make a hard link.
 944               (funcall nnmail-crosspost-link-function first file t)
 945             ;; Save the article.
 946             (nnmail-write-region (point-min) (point-max) file nil
 947                                  (if (nnheader-be-verbose 5) nil 'nomesg))
 948             (setq first file)))
 949         (setq ga (cdr ga))))
 950     ;; Generate a nov line for this article.  We generate the nov
 951     ;; line after saving, because nov generation destroys the
 952     ;; header.
 953     (setq headers (nndiary-parse-head chars))
 954     ;; Output the nov line to all nov databases that should have it.
 955     (let ((ga group-art))
 956       (while ga
 957         (nndiary-add-nov (caar ga) (cdar ga) headers)
 958         (setq ga (cdr ga))))
 959     group-art))
 960
 961 (defun nndiary-active-number (group)
 962   "Compute the next article number in GROUP."
 963   (let ((active (cadr (assoc group nndiary-group-alist))))
 964     ;; The group wasn't known to nndiary, so we just create an active
 965     ;; entry for it.
 966     (unless active
 967       ;; Perhaps the active file was corrupt?  See whether
 968       ;; there are any articles in this group.
 969       (nndiary-possibly-create-directory group)
 970       (nndiary-possibly-change-directory group)
 971       (unless nndiary-article-file-alist
 972         (setq nndiary-article-file-alist
 973               (sort
 974                (nnheader-article-to-file-alist nndiary-current-directory)
 975                'car-less-than-car)))
 976       (setq active
 977             (if nndiary-article-file-alist
 978                 (cons (caar nndiary-article-file-alist)
 979                       (caar (last nndiary-article-file-alist)))
 980               (cons 1 0)))
 981       (push (list group active) nndiary-group-alist))
 982     (setcdr active (1+ (cdr active)))
 983     (while (file-exists-p
 984             (expand-file-name (int-to-string (cdr active))
 985                               (nnmail-group-pathname group nndiary-directory)))
 986       (setcdr active (1+ (cdr active))))
 987     (cdr active)))
 988
 989 (defun nndiary-add-nov (group article headers)
 990   "Add a nov line for the GROUP base."
 991   (with-current-buffer (nndiary-open-nov group)
 992     (goto-char (point-max))
 993     (mail-header-set-number headers article)
 994     (nnheader-insert-nov headers)))
 995
 996 (defsubst nndiary-header-value ()
 997   (buffer-substring (match-end 0) (progn (end-of-line) (point))))
 998
 999 (defun nndiary-parse-head (chars &optional number)
1000   "Parse the head of the current buffer."
1001   (save-excursion
1002     (save-restriction
1003       (unless (zerop (buffer-size))
1004         (narrow-to-region
1005          (goto-char (point-min))
1006          (if (search-forward "\n\n" nil t) (1- (point)) (point-max))))
1007       (let ((headers (nnheader-parse-naked-head)))
1008         (mail-header-set-chars headers chars)
1009         (mail-header-set-number headers number)
1010         headers))))
1011
1012 (defun nndiary-open-nov (group)
1013   (or (cdr (assoc group nndiary-nov-buffer-alist))
1014       (let ((buffer (get-buffer-create (format " *nndiary overview %s*"
1015                                                group))))
1016         (with-current-buffer buffer
1017           (set (make-local-variable 'nndiary-nov-buffer-file-name)
1018                (expand-file-name
1019                 nndiary-nov-file-name
1020                 (nnmail-group-pathname group nndiary-directory)))
1021           (erase-buffer)
1022           (when (file-exists-p nndiary-nov-buffer-file-name)
1023             (nnheader-insert-file-contents nndiary-nov-buffer-file-name)))
1024         (push (cons group buffer) nndiary-nov-buffer-alist)
1025         buffer)))
1026
1027 (defun nndiary-save-nov ()
1028   (save-excursion
1029     (while nndiary-nov-buffer-alist
1030       (when (buffer-name (cdar nndiary-nov-buffer-alist))
1031         (set-buffer (cdar nndiary-nov-buffer-alist))
1032         (when (buffer-modified-p)
1033           (nnmail-write-region 1 (point-max) nndiary-nov-buffer-file-name
1034                                nil 'nomesg))
1035         (set-buffer-modified-p nil)
1036         (kill-buffer (current-buffer)))
1037       (setq nndiary-nov-buffer-alist (cdr nndiary-nov-buffer-alist)))))
1038
1039 ;;;###autoload
1040 (defun nndiary-generate-nov-databases (&optional server)
1041   "Generate NOV databases in all nndiary directories."
1042   (interactive (list (or (nnoo-current-server 'nndiary) "")))
1043   ;; Read the active file to make sure we don't re-use articles
1044   ;; numbers in empty groups.
1045   (nnmail-activate 'nndiary)
1046   (unless (nndiary-server-opened server)
1047     (nndiary-open-server server))
1048   (setq nndiary-directory (expand-file-name nndiary-directory))
1049   ;; Recurse down the directories.
1050   (nndiary-generate-nov-databases-1 nndiary-directory nil t)
1051   ;; Save the active file.
1052   (nnmail-save-active nndiary-group-alist nndiary-active-file))
1053
1054 (defun nndiary-generate-nov-databases-1 (dir &optional seen no-active)
1055   "Regenerate the NOV database in DIR."
1056   (interactive "DRegenerate NOV in: ")
1057   (setq dir (file-name-as-directory dir))
1058   ;; Only scan this sub-tree if we haven't been here yet.
1059   (unless (member (file-truename dir) seen)
1060     (push (file-truename dir) seen)
1061     ;; We descend recursively
1062     (let ((dirs (directory-files dir t nil t))
1063           dir)
1064       (while (setq dir (pop dirs))
1065         (when (and (not (string-match "^\\." (file-name-nondirectory dir)))
1066                    (file-directory-p dir))
1067           (nndiary-generate-nov-databases-1 dir seen))))
1068     ;; Do this directory.
1069     (let ((nndiary-files (sort (nnheader-article-to-file-alist dir)
1070                        'car-less-than-car)))
1071       (if (not nndiary-files)
1072           (let* ((group (nnheader-file-to-group
1073                          (directory-file-name dir) nndiary-directory))
1074                  (info (cadr (assoc group nndiary-group-alist))))
1075             (when info
1076               (setcar info (1+ (cdr info)))))
1077         (funcall nndiary-generate-active-function dir)
1078         ;; Generate the nov file.
1079         (nndiary-generate-nov-file dir nndiary-files)
1080         (unless no-active
1081           (nnmail-save-active nndiary-group-alist nndiary-active-file))))))
1082
1083 (defvar nndiary-files) ; dynamically bound in nndiary-generate-nov-databases-1
1084 (defun nndiary-generate-active-info (dir)
1085   ;; Update the active info for this group.
1086   (let* ((group (nnheader-file-to-group
1087                  (directory-file-name dir) nndiary-directory))
1088          (entry (assoc group nndiary-group-alist))
1089          (last (or (caadr entry) 0)))
1090     (setq nndiary-group-alist (delq entry nndiary-group-alist))
1091     (push (list group
1092                 (cons (or (caar nndiary-files) (1+ last))
1093                       (max last
1094                            (or (caar (last nndiary-files))
1095                                0))))
1096           nndiary-group-alist)))
1097
1098 (defun nndiary-generate-nov-file (dir files)
1099   (let* ((dir (file-name-as-directory dir))
1100          (nov (concat dir nndiary-nov-file-name))
1101          (nov-buffer (get-buffer-create " *nov*"))
1102          chars file headers)
1103     ;; Init the nov buffer.
1104     (with-current-buffer nov-buffer
1105       (buffer-disable-undo)
1106       (erase-buffer)
1107       (set-buffer nntp-server-buffer)
1108       ;; Delete the old NOV file.
1109       (when (file-exists-p nov)
1110         (funcall nnmail-delete-file-function nov))
1111       (while files
1112         (unless (file-directory-p (setq file (concat dir (cdar files))))
1113           (erase-buffer)
1114           (nnheader-insert-file-contents file)
1115           (narrow-to-region
1116            (goto-char (point-min))
1117            (progn
1118              (search-forward "\n\n" nil t)
1119              (setq chars (- (point-max) (point)))
1120              (max 1 (1- (point)))))
1121           (unless (zerop (buffer-size))
1122             (goto-char (point-min))
1123             (setq headers (nndiary-parse-head chars (caar files)))
1124             (with-current-buffer nov-buffer
1125               (goto-char (point-max))
1126               (nnheader-insert-nov headers)))
1127           (widen))
1128         (setq files (cdr files)))
1129       (with-current-buffer nov-buffer
1130         (nnmail-write-region 1 (point-max) nov nil 'nomesg)
1131         (kill-buffer (current-buffer))))))
1132
1133 (defun nndiary-nov-delete-article (group article)
1134   (with-current-buffer (nndiary-open-nov group)
1135     (when (nnheader-find-nov-line article)
1136       (delete-region (point) (progn (forward-line 1) (point)))
1137       (when (bobp)
1138         (let ((active (cadr (assoc group nndiary-group-alist)))
1139               num)
1140           (when active
1141             (if (eobp)
1142                 (setf (car active) (1+ (cdr active)))
1143               (when (and (setq num (ignore-errors (read (current-buffer))))
1144                          (numberp num))
1145                 (setf (car active) num)))))))
1146     t))
1147
1148 (defun nndiary-update-file-alist (&optional force)
1149   (when (or (not nndiary-article-file-alist)
1150             force)
1151     (setq nndiary-article-file-alist
1152           (nnheader-article-to-file-alist nndiary-current-directory))))
1153
1154
1155 (defun nndiary-string-to-number (str min &optional max)
1156   ;; Like `string-to-number' but barf if STR is not exactly an integer, and not
1157   ;; within the specified bounds.
1158   ;; Signals are caught by `nndiary-schedule'.
1159   (if (not (string-match "^[ \t]*[0-9]+[ \t]*$" str))
1160       (nndiary-error "not an integer value")
1161     ;; else
1162     (let ((val (string-to-number str)))
1163       (and (or (< val min)
1164                (and max (> val max)))
1165            (nndiary-error "value out of range"))
1166       val)))
1167
1168 (defun nndiary-parse-schedule-value (str min-or-values max)
1169   ;; Parse the schedule string STR, or signal an error.
1170   ;; Signals are caught by `nndiary-schedule'.
1171   (if (string-match "[ \t]*\\*[ \t]*" str)
1172       ;; unspecified
1173       nil
1174     ;; specified
1175     (if (listp min-or-values)
1176         ;; min-or-values is values
1177         ;; #### NOTE: this is actually only a hack for time zones.
1178         (let ((val (and (string-match "[ \t]*\\([^ \t]+\\)[ \t]*" str)
1179                         (match-string 1 str))))
1180           (if (and val (setq val (assoc val min-or-values)))
1181               (list (cadr val))
1182             (nndiary-error "invalid syntax")))
1183       ;; min-or-values is min
1184       (mapcar
1185        (lambda (val)
1186          (let ((res (split-string val "-")))
1187            (cond
1188             ((= (length res) 1)
1189              (nndiary-string-to-number (car res) min-or-values max))
1190             ((= (length res) 2)
1191              ;; don't know if crontab accepts this, but ensure
1192              ;; that BEG is <= END
1193              (let ((beg (nndiary-string-to-number (car res) min-or-values max))
1194                    (end (nndiary-string-to-number (cadr res) min-or-values max)))
1195                (cond ((< beg end)
1196                       (cons beg end))
1197                      ((= beg end)
1198                       beg)
1199                      (t
1200                       (cons end beg)))))
1201             (t
1202              (nndiary-error "invalid syntax")))
1203            ))
1204        (split-string str ",")))
1205     ))
1206
1207 ;; ### FIXME: remove this function if it's used only once.
1208 (defun nndiary-parse-schedule (head min-or-values max)
1209   ;; Parse the cron-like value of header X-Diary-HEAD in current buffer.
1210   ;; - Returns nil if `*'
1211   ;; - Otherwise returns a list of integers and/or ranges (BEG . END)
1212   ;; The exception is the Timze-Zone value which is always of the form (STR).
1213   ;; Signals are caught by `nndiary-schedule'.
1214   (let ((header (format "^X-Diary-%s: \\(.*\\)$" head)))
1215     (goto-char (point-min))
1216     (if (not (re-search-forward header nil t))
1217         (nndiary-error "header missing")
1218       ;; else
1219       (nndiary-parse-schedule-value (match-string 1) min-or-values max))
1220     ))
1221
1222 (defun nndiary-max (spec)
1223   ;; Returns the max of specification SPEC, or nil for permanent schedules.
1224   (unless (null spec)
1225     (let ((elts spec)
1226           (max 0)
1227           elt)
1228       (while (setq elt (pop elts))
1229         (if (integerp elt)
1230             (and (> elt max) (setq max elt))
1231           (and (> (cdr elt) max) (setq max (cdr elt)))))
1232       max)))
1233
1234 (defun nndiary-flatten (spec min &optional max)
1235   ;; flatten the spec by expanding ranges to all possible values.
1236   (let (flat n)
1237     (cond ((null spec)
1238            ;; this happens when I flatten something else than one of my
1239            ;; schedules (a list of read articles for instance).
1240            (unless (null max)
1241              (setq n min)
1242              (while (<= n max)
1243                (push n flat)
1244                (setq n (1+ n)))))
1245           (t
1246            (let ((elts spec)
1247                  elt)
1248              (while (setq elt (pop elts))
1249                (if (integerp elt)
1250                    (push elt flat)
1251                  ;; else
1252                  (setq n (car elt))
1253                  (while (<= n (cdr elt))
1254                    (push n flat)
1255                    (setq n (1+ n))))))))
1256     flat))
1257
1258 (defun nndiary-unflatten (spec)
1259   ;; opposite of flatten: build ranges if possible
1260   (setq spec (sort spec '<))
1261   (let (min max res)
1262     (while (setq min (pop spec))
1263       (setq max min)
1264       (while (and (car spec) (= (car spec) (1+ max)))
1265         (setq max (1+ max))
1266         (pop spec))
1267       (if (= max min)
1268           (setq res (append res (list min)))
1269         (setq res (append res (list (cons min max))))))
1270     res))
1271
1272 (defun nndiary-compute-reminders (date)
1273   ;; Returns a list of times corresponding to the reminders of date DATE.
1274   ;; See the comment in `nndiary-reminders' about rounding.
1275   (let* ((reminders nndiary-reminders)
1276          (date-elts (decode-time date))
1277          ;; ### NOTE: out-of-range values are accepted by encode-time. This
1278          ;; makes our life easier.
1279          (monday (- (nth 3 date-elts)
1280                     (if nndiary-week-starts-on-monday
1281                         (if (zerop (nth 6 date-elts))
1282                             6
1283                           (- (nth 6 date-elts) 1))
1284                       (nth 6 date-elts))))
1285          reminder res)
1286     ;; remove the DOW and DST entries
1287     (setcdr (nthcdr 5 date-elts) (nthcdr 8 date-elts))
1288     (while (setq reminder (pop reminders))
1289       (push
1290        (cond ((eq (cdr reminder) 'minute)
1291               (subtract-time
1292                (apply 'encode-time 0 (nthcdr 1 date-elts))
1293                (seconds-to-time (* (car reminder) 60.0))))
1294              ((eq (cdr reminder) 'hour)
1295               (subtract-time
1296                (apply 'encode-time 0 0 (nthcdr 2 date-elts))
1297                (seconds-to-time (* (car reminder) 3600.0))))
1298              ((eq (cdr reminder) 'day)
1299               (subtract-time
1300                (apply 'encode-time 0 0 0 (nthcdr 3 date-elts))
1301                (seconds-to-time (* (car reminder) 86400.0))))
1302              ((eq (cdr reminder) 'week)
1303               (subtract-time
1304                (apply 'encode-time 0 0 0 monday (nthcdr 4 date-elts))
1305                (seconds-to-time (* (car reminder) 604800.0))))
1306              ((eq (cdr reminder) 'month)
1307               (subtract-time
1308                (apply 'encode-time 0 0 0 1 (nthcdr 4 date-elts))
1309                (seconds-to-time (* (car reminder) 18748800.0))))
1310              ((eq (cdr reminder) 'year)
1311               (subtract-time
1312                (apply 'encode-time 0 0 0 1 1 (nthcdr 5 date-elts))
1313                (seconds-to-time (* (car reminder) 400861056.0)))))
1314        res))
1315     (sort res 'time-less-p)))
1316
1317 ;; FIXME: "occurrence" is misspelled in this function name.
1318
1319 (defun nndiary-last-occurence (sched)
1320   ;; Returns the last occurrence of schedule SCHED as an Emacs time struct, or
1321   ;; nil for permanent schedule or errors.
1322   (let ((minute (nndiary-max (nth 0 sched)))
1323         (hour (nndiary-max (nth 1 sched)))
1324         (year (nndiary-max (nth 4 sched)))
1325         (time-zone (or (and (nth 6 sched) (car (nth 6 sched)))
1326                        (current-time-zone))))
1327     (when year
1328       (or minute (setq minute 59))
1329       (or hour (setq hour 23))
1330       ;; I'll just compute all possible values and test them by decreasing
1331       ;; order until one succeeds. This is probably quite rude, but I got
1332       ;; bored in finding a good algorithm for doing that ;-)
1333       ;; ### FIXME: remove identical entries.
1334       (let ((dom-list (nth 2 sched))
1335             (month-list (sort (nndiary-flatten (nth 3 sched) 1 12) '>))
1336             (year-list (sort (nndiary-flatten (nth 4 sched) 1971) '>))
1337             (dow-list (nth 5 sched)))
1338         ;; Special case: an asterisk in one of the days specifications means
1339         ;; that only the other should be taken into account. If both are
1340         ;; unspecified, you would get all possible days in both.
1341         (cond ((null dow-list)
1342                ;; this gets all days if dom-list is nil
1343                (setq dom-list (nndiary-flatten dom-list 1 31)))
1344               ((null dom-list)
1345                ;; this also gets all days if dow-list is nil
1346                (setq dow-list (nndiary-flatten dow-list 0 6)))
1347               (t
1348                (setq dom-list (nndiary-flatten dom-list 1 31))
1349                (setq dow-list (nndiary-flatten dow-list 0 6))))
1350         (or
1351          (catch 'found
1352            (while (setq year (pop year-list))
1353              (let ((months month-list)
1354                    month)
1355                (while (setq month (pop months))
1356                  ;; Now we must merge the Dows with the Doms. To do that, we
1357                  ;; have to know which day is the 1st one for this month.
1358                  ;; Maybe there's simpler, but decode-time(encode-time) will
1359                  ;; give us the answer.
1360                  (let ((first (nth 6 (decode-time
1361                                       (encode-time 0 0 0 1 month year
1362                                                    time-zone))))
1363                        (max (cond ((= month 2)
1364                                    (if (date-leap-year-p year) 29 28))
1365                                   ((<= month 7)
1366                                    (if (zerop (% month 2)) 30 31))
1367                                   (t
1368                                    (if (zerop (% month 2)) 31 30))))
1369                        (doms dom-list)
1370                        (dows dow-list)
1371                        day days)
1372                    ;; first, review the doms to see if they are valid.
1373                    (while (setq day (pop doms))
1374                      (and (<= day max)
1375                           (push day days)))
1376                    ;; second add all possible dows
1377                    (while (setq day (pop dows))
1378                      ;; days start at 1.
1379                      (setq day (1+ (- day first)))
1380                      (and (< day 0) (setq day (+ 7 day)))
1381                      (while (<= day max)
1382                        (push day days)
1383                        (setq day (+ 7 day))))
1384                    ;; Finally, if we have some days, they are valid
1385                    (when days
1386                      (sort days '>)
1387                      (throw 'found
1388                             (encode-time 0 minute hour
1389                                          (car days) month year time-zone)))
1390                    )))))
1391          ;; There's an upper limit, but we didn't find any last occurrence.
1392          ;; This means that the schedule is undecidable. This can happen if
1393          ;; you happen to say something like "each Feb 31 until 2038".
1394          (progn
1395            (nnheader-report 'nndiary "Undecidable schedule")
1396            nil))
1397         ))))
1398
1399 ;; FIXME: "occurrence" is misspelled in this function name.
1400
1401 (defun nndiary-next-occurence (sched now)
1402   ;; Returns the next occurrence of schedule SCHED, starting from time NOW.
1403   ;; If there's no next occurrence, returns the last one (if any) which is then
1404   ;; in the past.
1405   (let* ((today (decode-time now))
1406          (this-minute (nth 1 today))
1407          (this-hour (nth 2 today))
1408          (this-day (nth 3 today))
1409          (this-month (nth 4 today))
1410          (this-year (nth 5 today))
1411          (minute-list (sort (nndiary-flatten (nth 0 sched) 0 59) '<))
1412          (hour-list (sort (nndiary-flatten (nth 1 sched) 0 23) '<))
1413          (dom-list (nth 2 sched))
1414          (month-list (sort (nndiary-flatten (nth 3 sched) 1 12) '<))
1415          (years (if (nth 4 sched)
1416                     (sort (nndiary-flatten (nth 4 sched) 1971) '<)
1417                   t))
1418          (dow-list (nth 5 sched))
1419          (year (1- this-year))
1420          (time-zone (or (and (nth 6 sched) (car (nth 6 sched)))
1421                         (current-time-zone))))
1422     ;; Special case: an asterisk in one of the days specifications means that
1423     ;; only the other should be taken into account. If both are unspecified,
1424     ;; you would get all possible days in both.
1425     (cond ((null dow-list)
1426            ;; this gets all days if dom-list is nil
1427            (setq dom-list (nndiary-flatten dom-list 1 31)))
1428           ((null dom-list)
1429            ;; this also gets all days if dow-list is nil
1430            (setq dow-list (nndiary-flatten dow-list 0 6)))
1431           (t
1432            (setq dom-list (nndiary-flatten dom-list 1 31))
1433            (setq dow-list (nndiary-flatten dow-list 0 6))))
1434     ;; Remove past years.
1435     (unless (eq years t)
1436       (while (and (car years) (< (car years) this-year))
1437         (pop years)))
1438     (if years
1439         ;; Because we might not be limited in years, we must guard against
1440         ;; infinite loops. Appart from cases like Feb 31, there are probably
1441         ;; other ones, (no monday XXX 2nd etc). I don't know any algorithm to
1442         ;; decide this, so I assume that if we reach 10 years later, the
1443         ;; schedule is undecidable.
1444         (or
1445          (catch 'found
1446            (while (if (eq years t)
1447                       (and (setq year (1+ year))
1448                            (<= year (+ 10 this-year)))
1449                     (setq year (pop years)))
1450              (let ((months month-list)
1451                    month)
1452                ;; Remove past months for this year.
1453                (and (= year this-year)
1454                     (while (and (car months) (< (car months) this-month))
1455                       (pop months)))
1456                (while (setq month (pop months))
1457                  ;; Now we must merge the Dows with the Doms. To do that, we
1458                  ;; have to know which day is the 1st one for this month.
1459                  ;; Maybe there's simpler, but decode-time(encode-time) will
1460                  ;; give us the answer.
1461                  (let ((first (nth 6 (decode-time
1462                                       (encode-time 0 0 0 1 month year
1463                                                    time-zone))))
1464                        (max (cond ((= month 2)
1465                                    (if (date-leap-year-p year) 29 28))
1466                                   ((<= month 7)
1467                                    (if (zerop (% month 2)) 30 31))
1468                                   (t
1469                                    (if (zerop (% month 2)) 31 30))))
1470                        (doms dom-list)
1471                        (dows dow-list)
1472                        day days)
1473                    ;; first, review the doms to see if they are valid.
1474                    (while (setq day (pop doms))
1475                      (and (<= day max)
1476                           (push day days)))
1477                    ;; second add all possible dows
1478                    (while (setq day (pop dows))
1479                      ;; days start at 1.
1480                      (setq day (1+ (- day first)))
1481                      (and (< day 0) (setq day (+ 7 day)))
1482                      (while (<= day max)
1483                        (push day days)
1484                        (setq day (+ 7 day))))
1485                    ;; Aaaaaaall right. Now we have a valid list of DAYS for
1486                    ;; this month and this year.
1487                    (when days
1488                      (setq days (sort days '<))
1489                      ;; Remove past days for this year and this month.
1490                      (and (= year this-year)
1491                           (= month this-month)
1492                           (while (and (car days) (< (car days) this-day))
1493                             (pop days)))
1494                      (while (setq day (pop days))
1495                        (let ((hours hour-list)
1496                              hour)
1497                          ;; Remove past hours for this year, this month and
1498                          ;; this day.
1499                          (and (= year this-year)
1500                               (= month this-month)
1501                               (= day this-day)
1502                               (while (and (car hours)
1503                                           (< (car hours) this-hour))
1504                                 (pop hours)))
1505                          (while (setq hour (pop hours))
1506                            (let ((minutes minute-list)
1507                                  minute)
1508                              ;; Remove past hours for this year, this month,
1509                              ;; this day and this hour.
1510                              (and (= year this-year)
1511                                   (= month this-month)
1512                                   (= day this-day)
1513                                   (= hour this-hour)
1514                                   (while (and (car minutes)
1515                                               (< (car minutes) this-minute))
1516                                     (pop minutes)))
1517                              (while (setq minute (pop minutes))
1518                                ;; Ouch! Here, we've got a complete valid
1519                                ;; schedule. It's a good one if it's in the
1520                                ;; future.
1521                                (let ((time (encode-time 0 minute hour day
1522                                                         month year
1523                                                         time-zone)))
1524                                  (and (time-less-p now time)
1525                                       (throw 'found time)))
1526                                ))))
1527                        ))
1528                    )))
1529              ))
1530          (nndiary-last-occurence sched))
1531       ;; else
1532       (nndiary-last-occurence sched))
1533     ))
1534
1535 (defun nndiary-expired-article-p (file)
1536   (with-temp-buffer
1537     (if (nnheader-insert-head file)
1538         (let ((sched (nndiary-schedule)))
1539           ;; An article has expired if its last schedule (if any) is in the
1540           ;; past. A permanent schedule never expires.
1541           (and sched
1542                (setq sched (nndiary-last-occurence sched))
1543                (time-less-p sched (current-time))))
1544       ;; else
1545       (nnheader-report 'nndiary "Could not read file %s" file)
1546       nil)
1547     ))
1548
1549 (defun nndiary-renew-article-p (file timestamp)
1550   (erase-buffer)
1551   (if (nnheader-insert-head file)
1552       (let ((now (current-time))
1553             (sched (nndiary-schedule)))
1554         ;; The article should be re-considered as unread if there's a reminder
1555         ;; between the group timestamp and the current time.
1556         (when (and sched (setq sched (nndiary-next-occurence sched now)))
1557           (let ((reminders ;; add the next occurrence itself at the end.
1558                  (append (nndiary-compute-reminders sched) (list sched))))
1559             (while (and reminders (time-less-p (car reminders) timestamp))
1560               (pop reminders))
1561             ;; The reminders might be empty if the last date is in the past,
1562             ;; or we've got at least the next occurrence itself left. All past
1563             ;; dates are renewed.
1564             (or (not reminders)
1565                 (time-less-p (car reminders) now)))
1566           ))
1567     ;; else
1568     (nnheader-report 'nndiary "Could not read file %s" file)
1569     nil))
1570
1571 ;; The end... ===============================================================
1572
1573 (dolist (header nndiary-headers)
1574   (setq header (intern (format "X-Diary-%s" (car header))))
1575   ;; Required for building NOV databases and some other stuff.
1576   (add-to-list 'gnus-extra-headers header)
1577   (add-to-list 'nnmail-extra-headers header))
1578
1579 (unless (assoc "nndiary" gnus-valid-select-methods)
1580   (gnus-declare-backend "nndiary" 'post-mail 'respool 'address))
1581
1582 (provide 'nndiary)
1583
1584 ;;; nndiary.el ends here