lisp/calendar/icalendar.el

   1 ;;; icalendar.el --- iCalendar implementation -*-coding: utf-8 -*-
   2
   3 ;; Copyright (C) 2002, 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
   4
   5 ;; Author:         Ulf Jasper <ulf.jasper@web.de>
   6 ;; Created:        August 2002
   7 ;; Keywords:       calendar
   8 ;; Human-Keywords: calendar, diary, iCalendar, vCalendar
   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 2, or (at your option)
  15 ;; 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; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; This package is documented in the Emacs Manual.
  30
  31 ;;   Please note:
  32 ;; - Diary entries which have a start time but no end time are assumed to
  33 ;;   last for one hour when they are exported.
  34 ;; - Weekly diary entries are assumed to occur the first time in the first
  35 ;;   week of the year 2000 when they are exported.
  36 ;; - Yearly diary entries are assumed to occur the first time in the year
  37 ;;   1900 when they are exported.
  38
  39 ;;; History:
  40
  41 ;;  0.07 onwards: see lisp/ChangeLog
  42
  43 ;;  0.06: Bugfixes regarding icalendar-import-format-*.
  44 ;;        Fix in icalendar-convert-diary-to-ical -- thanks to Philipp
  45 ;;        Grau.
  46
  47 ;;  0.05: New import format scheme: Replaced icalendar-import-prefix-*,
  48 ;;        icalendar-import-ignored-properties, and
  49 ;;        icalendar-import-separator with icalendar-import-format(-*).
  50 ;;        icalendar-import-file and icalendar-convert-diary-to-ical
  51 ;;        have an extra parameter which should prevent them from
  52 ;;        erasing their target files (untested!).
  53 ;;        Tested with Emacs 21.3.2
  54
  55 ;;  0.04: Bugfix: import: double quoted param values did not work
  56 ;;        Read DURATION property when importing.
  57 ;;        Added parameter icalendar-duration-correction.
  58
  59 ;;  0.03: Export takes care of european-calendar-style.
  60 ;;        Tested with Emacs 21.3.2 and XEmacs 21.4.12
  61
  62 ;;  0.02: Should work in XEmacs now.  Thanks to Len Trigg for the
  63 ;;        XEmacs patches!
  64 ;;        Added exporting from Emacs diary to ical.
  65 ;;        Some bugfixes, after testing with calendars from
  66 ;;        http://icalshare.com.
  67 ;;        Tested with Emacs 21.3.2 and XEmacs 21.4.12
  68
  69 ;;  0.01: First published version.  Trial version.  Alpha version.
  70
  71 ;; ======================================================================
  72 ;; To Do:
  73
  74 ;;  * Import from ical to diary:
  75 ;;    + Need more properties for icalendar-import-format
  76 ;;    + check vcalendar version
  77 ;;    + check (unknown) elements
  78 ;;    + recurring events!
  79 ;;    + works for european style calendars only! Does it?
  80 ;;    + alarm
  81 ;;    + exceptions in recurring events
  82 ;;    + the parser is too soft
  83 ;;    + error log is incomplete
  84 ;;    + nice to have: #include "webcal://foo.com/some-calendar.ics"
  85 ;;    + timezones, currently all times are local!
  86
  87 ;;  * Export from diary to ical
  88 ;;    + diary-date, diary-float, and self-made sexp entries are not
  89 ;;      understood
  90
  91 ;;  * Other things
  92 ;;    + clean up all those date/time parsing functions
  93 ;;    + Handle todo items?
  94 ;;    + Check iso 8601 for datetime and period
  95 ;;    + Which chars to (un)escape?
  96
  97
  98 ;;; Code:
  99
 100 (defconst icalendar-version "0.13"
 101   "Version number of icalendar.el.")
 102
 103 ;; ======================================================================
 104 ;; Customizables
 105 ;; ======================================================================
 106 (defgroup icalendar nil
 107   "Icalendar support."
 108   :prefix "icalendar-"
 109   :group 'calendar)
 110
 111 (defcustom icalendar-import-format
 112   "%s%d%l%o"
 113   "Format string for importing events from iCalendar into Emacs diary.
 114 This string defines how iCalendar events are inserted into diary
 115 file.  Meaning of the specifiers:
 116 %c Class, see `icalendar-import-format-class'
 117 %d Description, see `icalendar-import-format-description'
 118 %l Location, see `icalendar-import-format-location'
 119 %o Organizer, see `icalendar-import-format-organizer'
 120 %s Summary, see `icalendar-import-format-summary'
 121 %t Status, see `icalendar-import-format-status'
 122 %u URL, see `icalendar-import-format-url'"
 123   :type 'string
 124   :group 'icalendar)
 125
 126 (defcustom icalendar-import-format-summary
 127   "%s"
 128   "Format string defining how the summary element is formatted.
 129 This applies only if the summary is not empty! `%s' is replaced
 130 by the summary."
 131   :type 'string
 132   :group 'icalendar)
 133
 134 (defcustom icalendar-import-format-description
 135   "\n Desc: %s"
 136   "Format string defining how the description element is formatted.
 137 This applies only if the description is not empty! `%s' is
 138 replaced by the description."
 139   :type 'string
 140   :group 'icalendar)
 141
 142 (defcustom icalendar-import-format-location
 143   "\n Location: %s"
 144   "Format string defining how the location element is formatted.
 145 This applies only if the location is not empty! `%s' is replaced
 146 by the location."
 147   :type 'string
 148   :group 'icalendar)
 149
 150 (defcustom icalendar-import-format-organizer
 151   "\n Organizer: %s"
 152   "Format string defining how the organizer element is formatted.
 153 This applies only if the organizer is not empty! `%s' is
 154 replaced by the organizer."
 155   :type 'string
 156   :group 'icalendar)
 157
 158 (defcustom icalendar-import-format-url
 159   "\n URL: %s"
 160   "Format string defining how the URL element is formatted.
 161 This applies only if the URL is not empty! `%s' is replaced by
 162 the URL."
 163   :type 'string
 164   :group 'icalendar)
 165
 166 (defcustom icalendar-import-format-status
 167   "\n Status: %s"
 168   "Format string defining how the status element is formatted.
 169 This applies only if the status is not empty! `%s' is replaced by
 170 the status."
 171   :type 'string
 172   :group 'icalendar)
 173
 174 (defcustom icalendar-import-format-class
 175   "\n Class: %s"
 176   "Format string defining how the class element is formatted.
 177 This applies only if the class is not empty! `%s' is replaced by
 178 the class."
 179   :type 'string
 180   :group 'icalendar)
 181
 182 (defvar icalendar-debug nil
 183   "Enable icalendar debug messages.")
 184
 185 ;; ======================================================================
 186 ;; NO USER SERVICABLE PARTS BELOW THIS LINE
 187 ;; ======================================================================
 188
 189 (defconst icalendar--weekday-array ["SU" "MO" "TU" "WE" "TH" "FR" "SA"])
 190
 191 ;; ======================================================================
 192 ;; all the other libs we need
 193 ;; ======================================================================
 194 (require 'calendar)
 195
 196 ;; ======================================================================
 197 ;; misc
 198 ;; ======================================================================
 199 (defun icalendar--dmsg (&rest args)
 200   "Print message ARGS if `icalendar-debug' is non-nil."
 201   (if icalendar-debug
 202       (apply 'message args)))
 203
 204 ;; ======================================================================
 205 ;; Core functionality
 206 ;; Functions for parsing icalendars, importing and so on
 207 ;; ======================================================================
 208
 209 (defun icalendar--get-unfolded-buffer (folded-ical-buffer)
 210   "Return a new buffer containing the unfolded contents of a buffer.
 211 Folding is the iCalendar way of wrapping long lines.  In the
 212 created buffer all occurrences of CR LF BLANK are replaced by the
 213 empty string.  Argument FOLDED-ICAL-BUFFER is the unfolded input
 214 buffer."
 215   (let ((unfolded-buffer (get-buffer-create " *icalendar-work*")))
 216     (save-current-buffer
 217       (set-buffer unfolded-buffer)
 218       (erase-buffer)
 219       (insert-buffer-substring folded-ical-buffer)
 220       (goto-char (point-min))
 221       (while (re-search-forward "\r?\n[ \t]" nil t)
 222         (replace-match "" nil nil)))
 223     unfolded-buffer))
 224
 225 (defsubst icalendar--rris (&rest args)
 226   "Replace regular expression in string.
 227 Pass ARGS to `replace-regexp-in-string' (Emacs) or to
 228 `replace-in-string' (XEmacs)."
 229   ;; XEmacs:
 230   (if (fboundp 'replace-in-string)
 231       (save-match-data ;; apparently XEmacs needs save-match-data
 232         (apply 'replace-in-string args))
 233     ;; Emacs:
 234     (apply 'replace-regexp-in-string args)))
 235
 236 (defun icalendar--read-element (invalue inparams)
 237   "Recursively read the next iCalendar element in the current buffer.
 238 INVALUE gives the current iCalendar element we are reading.
 239 INPARAMS gives the current parameters.....
 240 This function calls itself recursively for each nested calendar element
 241 it finds"
 242   (let (element children line name params param param-name param-value
 243                 value
 244                 (continue t))
 245     (setq children '())
 246     (while (and continue
 247                 (re-search-forward "^\\([A-Za-z0-9-]+\\)[;:]" nil t))
 248       (setq name (intern (match-string 1)))
 249       (backward-char 1)
 250       (setq params '())
 251       (setq line '())
 252       (while (looking-at ";")
 253         (re-search-forward ";\\([A-Za-z0-9-]+\\)=" nil nil)
 254         (setq param-name (intern (match-string 1)))
 255         (re-search-forward "\\(\\([^;,:\"]+\\)\\|\"\\([^\"]+\\)\"\\)[;:]"
 256                            nil t)
 257         (backward-char 1)
 258         (setq param-value (or (match-string 2) (match-string 3)))
 259         (setq param (list param-name param-value))
 260         (while (looking-at ",")
 261           (re-search-forward "\\(\\([^;,:]+\\)\\|\"\\([^\"]+\\)\"\\)"
 262                              nil t)
 263           (if (match-string 2)
 264               (setq param-value (match-string 2))
 265             (setq param-value (match-string 3)))
 266           (setq param (append param param-value)))
 267         (setq params (append params param)))
 268       (unless (looking-at ":")
 269         (error "Oops"))
 270       (forward-char 1)
 271       (re-search-forward  "\\(.*\\)\\(\r?\n[ \t].*\\)*" nil t)
 272       (setq value (icalendar--rris "\r?\n[ \t]" "" (match-string 0)))
 273       (setq line (list name params value))
 274       (cond ((eq name 'BEGIN)
 275              (setq children
 276                    (append children
 277                            (list (icalendar--read-element (intern value)
 278                                                           params)))))
 279             ((eq name 'END)
 280              (setq continue nil))
 281             (t
 282              (setq element (append element (list line))))))
 283     (if invalue
 284         (list invalue inparams element children)
 285       children)))
 286
 287 ;; ======================================================================
 288 ;; helper functions for examining events
 289 ;; ======================================================================
 290
 291 ;;(defsubst icalendar--get-all-event-properties (event)
 292 ;;  "Return the list of properties in this EVENT."
 293 ;;  (car (cddr event)))
 294
 295 (defun icalendar--get-event-property (event prop)
 296   "For the given EVENT return the value of the first occurrence of PROP."
 297   (catch 'found
 298     (let ((props (car (cddr event))) pp)
 299       (while props
 300         (setq pp (car props))
 301         (if (eq (car pp) prop)
 302             (throw 'found (car (cddr pp))))
 303         (setq props (cdr props))))
 304     nil))
 305
 306 (defun icalendar--get-event-property-attributes (event prop)
 307   "For the given EVENT return attributes of the first occurrence of PROP."
 308   (catch 'found
 309     (let ((props (car (cddr event))) pp)
 310       (while props
 311         (setq pp (car props))
 312         (if (eq (car pp) prop)
 313             (throw 'found (cadr pp)))
 314         (setq props (cdr props))))
 315     nil))
 316
 317 (defun icalendar--get-event-properties (event prop)
 318   "For the given EVENT return a list of all values of the property PROP."
 319   (let ((props (car (cddr event))) pp result)
 320     (while props
 321       (setq pp (car props))
 322       (if (eq (car pp) prop)
 323           (setq result (append (split-string (car (cddr pp)) ",") result)))
 324       (setq props (cdr props)))
 325     result))
 326
 327 ;; (defun icalendar--set-event-property (event prop new-value)
 328 ;;   "For the given EVENT set the property PROP to the value NEW-VALUE."
 329 ;;   (catch 'found
 330 ;;     (let ((props (car (cddr event))) pp)
 331 ;;       (while props
 332 ;;         (setq pp (car props))
 333 ;;         (when (eq (car pp) prop)
 334 ;;           (setcdr (cdr pp) new-value)
 335 ;;           (throw 'found (car (cddr pp))))
 336 ;;         (setq props (cdr props)))
 337 ;;       (setq props (car (cddr event)))
 338 ;;       (setcar (cddr event)
 339 ;;               (append props (list (list prop nil new-value)))))))
 340
 341 (defun icalendar--get-children (node name)
 342   "Return all children of the given NODE which have a name NAME.
 343 For instance the VCALENDAR node can have VEVENT children as well as VTODO
 344 children."
 345   (let ((result nil)
 346         (children (cadr (cddr node))))
 347     (when (eq (car node) name)
 348       (setq result node))
 349     ;;(message "%s" node)
 350     (when children
 351       (let ((subresult
 352              (delq nil
 353                    (mapcar (lambda (n)
 354                              (icalendar--get-children n name))
 355                            children))))
 356         (if subresult
 357             (if result
 358                 (setq result (append result subresult))
 359               (setq result subresult)))))
 360     result))
 361
 362                                         ; private
 363 (defun icalendar--all-events (icalendar)
 364   "Return the list of all existing events in the given ICALENDAR."
 365   (icalendar--get-children (car icalendar) 'VEVENT))
 366
 367 (defun icalendar--split-value (value-string)
 368   "Split VALUE-STRING at ';='."
 369   (let ((result '())
 370         param-name param-value)
 371     (when value-string
 372       (save-current-buffer
 373         (set-buffer (get-buffer-create " *icalendar-work*"))
 374         (set-buffer-modified-p nil)
 375         (erase-buffer)
 376         (insert value-string)
 377         (goto-char (point-min))
 378         (while
 379             (re-search-forward
 380              "\\([A-Za-z0-9-]+\\)=\\(\\([^;,:]+\\)\\|\"\\([^\"]+\\)\"\\);?"
 381              nil t)
 382           (setq param-name (intern (match-string 1)))
 383           (setq param-value (match-string 2))
 384           (setq result
 385                 (append result (list (list param-name param-value)))))))
 386     result))
 387
 388 (defun icalendar--decode-isodatetime (isodatetimestring &optional day-shift)
 389   "Return ISODATETIMESTRING in format like `decode-time'.
 390 Converts from ISO-8601 to Emacs representation.  If
 391 ISODATETIMESTRING specifies UTC time (trailing letter Z) the
 392 decoded time is given in the local time zone!  If optional
 393 parameter DAY-SHIFT is non-nil the result is shifted by DAY-SHIFT
 394 days.
 395
 396 FIXME: TZID-attributes are ignored....!
 397 FIXME: multiple comma-separated values should be allowed!"
 398   (icalendar--dmsg isodatetimestring)
 399   (if isodatetimestring
 400       ;; day/month/year must be present
 401       (let ((year  (read (substring isodatetimestring 0 4)))
 402             (month (read (substring isodatetimestring 4 6)))
 403             (day   (read (substring isodatetimestring 6 8)))
 404             (hour 0)
 405             (minute 0)
 406             (second 0))
 407         (when (> (length isodatetimestring) 12)
 408           ;; hour/minute present
 409           (setq hour (read (substring isodatetimestring 9 11)))
 410           (setq minute (read (substring isodatetimestring 11 13))))
 411         (when (> (length isodatetimestring) 14)
 412           ;; seconds present
 413           (setq second (read (substring isodatetimestring 13 15))))
 414         (when (and (> (length isodatetimestring) 15)
 415                    ;; UTC specifier present
 416                    (char-equal ?Z (aref isodatetimestring 15)))
 417           ;; if not UTC add current-time-zone offset
 418           (setq second (+ (car (current-time-zone)) second)))
 419         ;; shift if necessary
 420         (if day-shift
 421             (let ((mdy (calendar-gregorian-from-absolute
 422                         (+ (calendar-absolute-from-gregorian
 423                             (list month day year))
 424                            day-shift))))
 425               (setq month (nth 0 mdy))
 426               (setq day   (nth 1 mdy))
 427               (setq year  (nth 2 mdy))))
 428         ;; create the decoded date-time
 429         ;; FIXME!?!
 430         (condition-case nil
 431             (decode-time (encode-time second minute hour day month year))
 432           (error
 433            (message "Cannot decode \"%s\"" isodatetimestring)
 434            ;; hope for the best...
 435            (list second minute hour day month year 0 nil 0))))
 436     ;; isodatetimestring == nil
 437     nil))
 438
 439 (defun icalendar--decode-isoduration (isodurationstring
 440                                       &optional duration-correction)
 441   "Convert ISODURATIONSTRING into format provided by `decode-time'.
 442 Converts from ISO-8601 to Emacs representation.  If ISODURATIONSTRING
 443 specifies UTC time (trailing letter Z) the decoded time is given in
 444 the local time zone!
 445
 446 Optional argument DURATION-CORRECTION shortens result by one day.
 447
 448 FIXME: TZID-attributes are ignored....!
 449 FIXME: multiple comma-separated values should be allowed!"
 450   (if isodurationstring
 451       (save-match-data
 452         (string-match
 453          (concat
 454           "^P[+-]?\\("
 455           "\\(\\([0-9]+\\)D\\)"         ; days only
 456           "\\|"
 457           "\\(\\(\\([0-9]+\\)D\\)?T\\(\\([0-9]+\\)H\\)?" ; opt days
 458           "\\(\\([0-9]+\\)M\\)?\\(\\([0-9]+\\)S\\)?\\)"  ; mand. time
 459           "\\|"
 460           "\\(\\([0-9]+\\)W\\)"         ; weeks only
 461           "\\)$") isodurationstring)
 462         (let ((seconds 0)
 463               (minutes 0)
 464               (hours 0)
 465               (days 0)
 466               (months 0)
 467               (years 0))
 468           (cond
 469            ((match-beginning 2)         ;days only
 470             (setq days (read (substring isodurationstring
 471                                         (match-beginning 3)
 472                                         (match-end 3))))
 473             (when duration-correction
 474               (setq days (1- days))))
 475            ((match-beginning 4)         ;days and time
 476             (if (match-beginning 5)
 477                 (setq days (* 7 (read (substring isodurationstring
 478                                                  (match-beginning 6)
 479                                                  (match-end 6))))))
 480             (if (match-beginning 7)
 481                 (setq hours (read (substring isodurationstring
 482                                              (match-beginning 8)
 483                                              (match-end 8)))))
 484             (if (match-beginning 9)
 485                 (setq minutes (read (substring isodurationstring
 486                                                (match-beginning 10)
 487                                                (match-end 10)))))
 488             (if (match-beginning 11)
 489                 (setq seconds (read (substring isodurationstring
 490                                                (match-beginning 12)
 491                                                (match-end 12))))))
 492            ((match-beginning 13)        ;weeks only
 493             (setq days (* 7 (read (substring isodurationstring
 494                                              (match-beginning 14)
 495                                              (match-end 14)))))))
 496           (list seconds minutes hours days months years)))
 497     ;; isodatetimestring == nil
 498     nil))
 499
 500 (defun icalendar--add-decoded-times (time1 time2)
 501   "Add TIME1 to TIME2.
 502 Both times must be given in decoded form.  One of these times must be
 503 valid (year > 1900 or something)."
 504   ;; FIXME: does this function exist already?
 505   (decode-time (encode-time
 506                 (+ (nth 0 time1) (nth 0 time2))
 507                 (+ (nth 1 time1) (nth 1 time2))
 508                 (+ (nth 2 time1) (nth 2 time2))
 509                 (+ (nth 3 time1) (nth 3 time2))
 510                 (+ (nth 4 time1) (nth 4 time2))
 511                 (+ (nth 5 time1) (nth 5 time2))
 512                 nil
 513                 nil
 514                 ;;(or (nth 6 time1) (nth 6 time2)) ;; FIXME?
 515                 )))
 516
 517 (defun icalendar--datetime-to-noneuropean-date (datetime &optional separator)
 518   "Convert the decoded DATETIME to non-european-style format.
 519 Optional argument SEPARATOR gives the separator between month,
 520 day, and year.  If nil a blank character is used as separator.
 521 Non-European format: \"month day year\"."
 522   (if datetime
 523       (format "%d%s%d%s%d" (nth 4 datetime) ;month
 524               (or separator " ")
 525               (nth 3 datetime)          ;day
 526               (or separator " ")
 527               (nth 5 datetime))         ;year
 528     ;; datetime == nil
 529     nil))
 530
 531 (defun icalendar--datetime-to-european-date (datetime &optional separator)
 532   "Convert the decoded DATETIME to European format.
 533 Optional argument SEPARATOR gives the separator between month,
 534 day, and year.  If nil a blank character is used as separator.
 535 European format: (day month year).
 536 FIXME"
 537   (if datetime
 538       (format "%d%s%d%s%d" (nth 3 datetime) ;day
 539               (or separator " ")
 540               (nth 4 datetime)            ;month
 541               (or separator " ")
 542               (nth 5 datetime))           ;year
 543     ;; datetime == nil
 544     nil))
 545
 546 (defun icalendar--datetime-to-diary-date (datetime &optional separator)
 547   "Convert the decoded DATETIME to diary format.
 548 Optional argument SEPARATOR gives the separator between month,
 549 day, and year.  If nil a blank character is used as separator.
 550 Call icalendar--datetime-to-(non)-european-date according to
 551 value of `european-calendar-style'."
 552   (if european-calendar-style
 553       (icalendar--datetime-to-european-date datetime separator)
 554     (icalendar--datetime-to-noneuropean-date datetime separator)))
 555
 556 (defun icalendar--datetime-to-colontime (datetime)
 557   "Extract the time part of a decoded DATETIME into 24-hour format.
 558 Note that this silently ignores seconds."
 559   (format "%02d:%02d" (nth 2 datetime) (nth 1 datetime)))
 560
 561 (defun icalendar--get-month-number (monthname)
 562   "Return the month number for the given MONTHNAME."
 563   (catch 'found
 564     (let ((num 1)
 565           (m (downcase monthname)))
 566       (mapc (lambda (month)
 567               (let ((mm (downcase month)))
 568                 (if (or (string-equal mm m)
 569                         (string-equal (substring mm 0 3) m))
 570                     (throw 'found num))
 571                 (setq num (1+ num))))
 572             calendar-month-name-array))
 573     ;; Error:
 574     -1))
 575
 576 (defun icalendar--get-weekday-number (abbrevweekday)
 577   "Return the number for the ABBREVWEEKDAY."
 578   (if abbrevweekday
 579       (catch 'found
 580         (let ((num 0)
 581               (aw (downcase abbrevweekday)))
 582           (mapc (lambda (day)
 583                   (let ((d (downcase day)))
 584                     (if (string-equal d aw)
 585                         (throw 'found num))
 586                     (setq num (1+ num))))
 587                 icalendar--weekday-array)))
 588     ;; Error:
 589     -1))
 590
 591 (defun icalendar--get-weekday-abbrev (weekday)
 592   "Return the abbreviated WEEKDAY."
 593   (catch 'found
 594     (let ((num 0)
 595           (w (downcase weekday)))
 596       (mapc (lambda (day)
 597               (let ((d (downcase day)))
 598                 (if (or (string-equal d w)
 599                         (string-equal (substring d 0 3) w))
 600                     (throw 'found (aref icalendar--weekday-array num)))
 601                 (setq num (1+ num))))
 602             calendar-day-name-array))
 603     ;; Error:
 604     nil))
 605
 606 (defun icalendar--date-to-isodate (date &optional day-shift)
 607   "Convert DATE to iso-style date.
 608 DATE must be a list of the form (month day year).
 609 If DAY-SHIFT is non-nil, the result is shifted by DAY-SHIFT days."
 610   (let ((mdy (calendar-gregorian-from-absolute
 611               (+ (calendar-absolute-from-gregorian date)
 612                  (or day-shift 0)))))
 613     (format "%04d%02d%02d" (nth 2 mdy) (nth 0 mdy) (nth 1 mdy))))
 614
 615
 616 (defun icalendar--datestring-to-isodate (datestring &optional day-shift)
 617   "Convert diary-style DATESTRING to iso-style date.
 618 If DAY-SHIFT is non-nil, the result is shifted by DAY-SHIFT days
 619 -- DAY-SHIFT must be either nil or an integer.  This function
 620 takes care of european-style."
 621   (let ((day -1) month year)
 622     (save-match-data
 623       (cond ( ;; numeric date
 624              (string-match (concat "\\s-*"
 625                                    "0?\\([1-9][0-9]?\\)[ \t/]\\s-*"
 626                                    "0?\\([1-9][0-9]?\\),?[ \t/]\\s-*"
 627                                    "\\([0-9]\\{4\\}\\)")
 628                            datestring)
 629              (setq day (read (substring datestring (match-beginning 1)
 630                                         (match-end 1))))
 631              (setq month (read (substring datestring (match-beginning 2)
 632                                           (match-end 2))))
 633              (setq year (read (substring datestring (match-beginning 3)
 634                                          (match-end 3))))
 635              (unless european-calendar-style
 636                (let ((x month))
 637                  (setq month day)
 638                  (setq day x))))
 639             ( ;; date contains month names -- european-style
 640              (string-match (concat "\\s-*"
 641                                    "0?\\([123]?[0-9]\\)[ \t/]\\s-*"
 642                                    "\\([A-Za-z][^ ]+\\)[ \t/]\\s-*"
 643                                    "\\([0-9]\\{4\\}\\)")
 644                            datestring)
 645              (setq day (read (substring datestring (match-beginning 1)
 646                                         (match-end 1))))
 647              (setq month (icalendar--get-month-number
 648                           (substring datestring (match-beginning 2)
 649                                      (match-end 2))))
 650              (setq year (read (substring datestring (match-beginning 3)
 651                                          (match-end 3)))))
 652             ( ;; date contains month names -- non-european-style
 653              (string-match (concat "\\s-*"
 654                                    "\\([A-Za-z][^ ]+\\)[ \t/]\\s-*"
 655                                    "0?\\([123]?[0-9]\\),?[ \t/]\\s-*"
 656                                    "\\([0-9]\\{4\\}\\)")
 657                            datestring)
 658              (setq day (read (substring datestring (match-beginning 2)
 659                                         (match-end 2))))
 660              (setq month (icalendar--get-month-number
 661                           (substring datestring (match-beginning 1)
 662                                      (match-end 1))))
 663              (setq year (read (substring datestring (match-beginning 3)
 664                                          (match-end 3)))))
 665             (t
 666              nil)))
 667     (if (> day 0)
 668         (let ((mdy (calendar-gregorian-from-absolute
 669                     (+ (calendar-absolute-from-gregorian (list month day
 670                                                                year))
 671                        (or day-shift 0)))))
 672           (format "%04d%02d%02d" (nth 2 mdy) (nth 0 mdy) (nth 1 mdy)))
 673       nil)))
 674
 675 (defun icalendar--diarytime-to-isotime (timestring ampmstring)
 676   "Convert a a time like 9:30pm to an iso-conform string like T213000.
 677 In this example the TIMESTRING would be \"9:30\" and the AMPMSTRING
 678 would be \"pm\"."
 679   (if timestring
 680       (let ((starttimenum (read (icalendar--rris ":" "" timestring))))
 681         ;; take care of am/pm style
 682         (if (and ampmstring (string= "pm" ampmstring))
 683             (setq starttimenum (+ starttimenum 1200)))
 684         (format "T%04d00" starttimenum))
 685     nil))
 686
 687 (defun icalendar--convert-string-for-export (string)
 688   "Escape comma and other critical characters in STRING."
 689   (icalendar--rris "," "\\\\," string))
 690
 691 (defun icalendar--convert-string-for-import (string)
 692   "Remove escape chars for comma, semicolon etc. from STRING."
 693   (icalendar--rris
 694    "\\\\n" "\n " (icalendar--rris
 695                   "\\\\\"" "\"" (icalendar--rris
 696                                  "\\\\;" ";" (icalendar--rris
 697                                               "\\\\," "," string)))))
 698
 699 ;; ======================================================================
 700 ;; Export -- convert emacs-diary to icalendar
 701 ;; ======================================================================
 702
 703 ;;;###autoload
 704 (defun icalendar-export-file (diary-filename ical-filename)
 705   "Export diary file to iCalendar format.
 706 All diary entries in the file DIARY-FILENAME are converted to iCalendar
 707 format.  The result is appended to the file ICAL-FILENAME."
 708   (interactive "FExport diary data from file:
 709 Finto iCalendar file: ")
 710   (save-current-buffer
 711     (set-buffer (find-file diary-filename))
 712     (icalendar-export-region (point-min) (point-max) ical-filename)))
 713
 714 (defalias 'icalendar-convert-diary-to-ical 'icalendar-export-file)
 715 (make-obsolete 'icalendar-convert-diary-to-ical 'icalendar-export-file)
 716
 717 ;;;###autoload
 718 (defun icalendar-export-region (min max ical-filename)
 719   "Export region in diary file to iCalendar format.
 720 All diary entries in the region from MIN to MAX in the current buffer are
 721 converted to iCalendar format.  The result is appended to the file
 722 ICAL-FILENAME.
 723 This function attempts to return t if something goes wrong.  In this
 724 case an error string which describes all the errors and problems is
 725 written into the buffer `*icalendar-errors*'."
 726   (interactive "r
 727 FExport diary data into iCalendar file: ")
 728   (let ((result "")
 729         (start 0)
 730         (entry-main "")
 731         (entry-rest "")
 732         (header "")
 733         (contents-n-summary)
 734         (contents)
 735         (found-error nil)
 736         (nonmarker (concat "^" (regexp-quote diary-nonmarking-symbol)
 737                            "?"))
 738         (other-elements nil))
 739     ;; prepare buffer with error messages
 740     (save-current-buffer
 741       (set-buffer (get-buffer-create "*icalendar-errors*"))
 742       (erase-buffer))
 743
 744     ;; here we go
 745     (save-excursion
 746       (goto-char min)
 747       (while (re-search-forward
 748               "^\\([^ \t\n].+\\)\\(\\(\n[ \t].*\\)*\\)" max t)
 749         (setq entry-main (match-string 1))
 750         (if (match-beginning 2)
 751             (setq entry-rest (match-string 2))
 752           (setq entry-rest ""))
 753         (setq header (format "\nBEGIN:VEVENT\nUID:emacs%d%d%d"
 754                              (car (current-time))
 755                              (cadr (current-time))
 756                              (car (cddr (current-time)))))
 757         (condition-case error-val
 758             (progn
 759               (setq contents-n-summary
 760                     (icalendar--convert-to-ical nonmarker entry-main))
 761               (setq other-elements (icalendar--parse-summary-and-rest
 762                                     (concat entry-main entry-rest)))
 763               (setq contents (concat (car contents-n-summary)
 764                                      "\nSUMMARY:" (cadr contents-n-summary)))
 765               (let ((cla (cdr (assoc 'cla other-elements)))
 766                     (des (cdr (assoc 'des other-elements)))
 767                     (loc (cdr (assoc 'loc other-elements)))
 768                     (org (cdr (assoc 'org other-elements)))
 769                     (sta (cdr (assoc 'sta other-elements)))
 770                     (sum (cdr (assoc 'sum other-elements)))
 771                     (url (cdr (assoc 'url other-elements))))
 772                 (if cla
 773                     (setq contents (concat contents "\nCLASS:" cla)))
 774                 (if des
 775                     (setq contents (concat contents "\nDESCRIPTION:" des)))
 776                 (if loc
 777                     (setq contents (concat contents "\nLOCATION:" loc)))
 778                 (if org
 779                     (setq contents (concat contents "\nORGANIZER:" org)))
 780                 (if sta
 781                     (setq contents (concat contents "\nSTATUS:" sta)))
 782                 ;;(if sum
 783                 ;;    (setq contents (concat contents "\nSUMMARY:" sum)))
 784                 (if url
 785                     (setq contents (concat contents "\nURL:" url))))
 786               (setq result (concat result header contents "\nEND:VEVENT")))
 787           ;; handle errors
 788           (error
 789            (setq found-error t)
 790            (save-current-buffer
 791              (set-buffer (get-buffer-create "*icalendar-errors*"))
 792              (insert (format "Error in line %d -- %s: `%s'\n"
 793                              (count-lines (point-min) (point))
 794                              (cadr error-val)
 795                              entry-main))))))
 796
 797       ;; we're done, insert everything into the file
 798       (save-current-buffer
 799         (let ((coding-system-for-write 'utf-8))
 800           (set-buffer (find-file ical-filename))
 801           (goto-char (point-max))
 802           (insert "BEGIN:VCALENDAR")
 803           (insert "\nPRODID:-//Emacs//NONSGML icalendar.el//EN")
 804           (insert "\nVERSION:2.0")
 805           (insert result)
 806           (insert "\nEND:VCALENDAR\n")
 807           ;; save the diary file
 808           (save-buffer)
 809           (unless found-error
 810             (bury-buffer)))))
 811     found-error))
 812
 813 (defun icalendar--convert-to-ical (nonmarker entry-main)
 814   "Convert a diary entry to icalendar format.
 815 NONMARKER is a regular expression matching the start of non-marking
 816 entries.  ENTRY-MAIN is the first line of the diary entry."
 817   (or
 818    ;; anniversaries -- %%(diary-anniversary ...)
 819    (icalendar--convert-anniversary-to-ical nonmarker entry-main)
 820    ;; cyclic events -- %%(diary-cyclic ...)
 821    (icalendar--convert-cyclic-to-ical nonmarker entry-main)
 822    ;; diary-date -- %%(diary-date ...)
 823    (icalendar--convert-date-to-ical nonmarker entry-main)
 824    ;; float events -- %%(diary-float ...)
 825    (icalendar--convert-float-to-ical nonmarker entry-main)
 826    ;; block events -- %%(diary-block ...)
 827    (icalendar--convert-block-to-ical nonmarker entry-main)
 828    ;; other sexp diary entries
 829    (icalendar--convert-sexp-to-ical nonmarker entry-main)
 830    ;; weekly by day -- Monday 8:30 Team meeting
 831    (icalendar--convert-weekly-to-ical nonmarker entry-main)
 832    ;; yearly by day -- 1 May Tag der Arbeit
 833    (icalendar--convert-yearly-to-ical nonmarker entry-main)
 834    ;; "ordinary" events, start and end time given
 835    ;; 1 Feb 2003 blah
 836    (icalendar--convert-ordinary-to-ical nonmarker entry-main)
 837    ;; everything else
 838    ;; Oops! what's that?
 839    (error "Could not parse entry")))
 840
 841 (defun icalendar--parse-summary-and-rest (summary-and-rest)
 842   "Parse SUMMARY-AND-REST from a diary to fill iCalendar properties."
 843   (save-match-data
 844     (let* ((s icalendar-import-format)
 845            (p-cla (or (string-match "%c" icalendar-import-format) -1))
 846            (p-des (or (string-match "%d" icalendar-import-format) -1))
 847            (p-loc (or (string-match "%l" icalendar-import-format) -1))
 848            (p-org (or (string-match "%o" icalendar-import-format) -1))
 849            (p-sum (or (string-match "%s" icalendar-import-format) -1))
 850            (p-sta (or (string-match "%t" icalendar-import-format) -1))
 851            (p-url (or (string-match "%u" icalendar-import-format) -1))
 852            (p-list (sort (list p-cla p-des p-loc p-org p-sta p-sum p-url) '<))
 853            pos-cla pos-des pos-loc pos-org pos-sta pos-sum pos-url)
 854       (dotimes (i (length p-list))
 855         (cond ((and (>= p-cla 0) (= (nth i p-list) p-cla))
 856                (setq pos-cla (+ 2 (* 2 i))))
 857               ((and (>= p-des 0) (= (nth i p-list) p-des))
 858                (setq pos-des (+ 2 (* 2 i))))
 859               ((and (>= p-loc 0) (= (nth i p-list) p-loc))
 860                (setq pos-loc (+ 2 (* 2 i))))
 861               ((and (>= p-org 0) (= (nth i p-list) p-org))
 862                (setq pos-org (+ 2 (* 2 i))))
 863               ((and (>= p-sta 0) (= (nth i p-list) p-sta))
 864                (setq pos-sta (+ 2 (* 2 i))))
 865               ((and (>= p-sum 0) (= (nth i p-list) p-sum))
 866                (setq pos-sum (+ 2 (* 2 i))))
 867               ((and (>= p-url 0) (= (nth i p-list) p-url))
 868                (setq pos-url (+ 2 (* 2 i))))))
 869       (mapc (lambda (ij)
 870               (setq s (icalendar--rris (car ij) (cadr ij) s t t)))
 871             (list
 872              ;; summary must be first! because of %s
 873              (list "%s"
 874                    (concat "\\(" icalendar-import-format-summary "\\)?"))
 875              (list "%c"
 876                    (concat "\\(" icalendar-import-format-class "\\)?"))
 877              (list "%d"
 878                    (concat "\\(" icalendar-import-format-description "\\)?"))
 879              (list "%l"
 880                    (concat "\\(" icalendar-import-format-location "\\)?"))
 881              (list "%o"
 882                    (concat "\\(" icalendar-import-format-organizer "\\)?"))
 883              (list "%t"
 884                    (concat "\\(" icalendar-import-format-status "\\)?"))
 885              (list "%u"
 886                    (concat "\\(" icalendar-import-format-url "\\)?"))))
 887       (setq s (concat (icalendar--rris "%s" "\\(.*\\)" s nil t) " "))
 888       (if (string-match s summary-and-rest)
 889           (let (cla des loc org sta sum url)
 890             (if (and pos-sum (match-beginning pos-sum))
 891                 (setq sum (substring summary-and-rest
 892                                      (match-beginning pos-sum)
 893                                      (match-end pos-sum))))
 894             (if (and pos-cla (match-beginning pos-cla))
 895                 (setq cla (substring summary-and-rest
 896                                      (match-beginning pos-cla)
 897                                      (match-end pos-cla))))
 898             (if (and pos-des (match-beginning pos-des))
 899                 (setq des (substring summary-and-rest
 900                                      (match-beginning pos-des)
 901                                      (match-end pos-des))))
 902             (if (and pos-loc (match-beginning pos-loc))
 903                 (setq loc (substring summary-and-rest
 904                                      (match-beginning pos-loc)
 905                                      (match-end pos-loc))))
 906             (if (and pos-org (match-beginning pos-org))
 907                 (setq org (substring summary-and-rest
 908                                      (match-beginning pos-org)
 909                                      (match-end pos-org))))
 910             (if (and pos-sta (match-beginning pos-sta))
 911                 (setq sta (substring summary-and-rest
 912                                      (match-beginning pos-sta)
 913                                      (match-end pos-sta))))
 914             (if (and pos-url (match-beginning pos-url))
 915                 (setq url (substring summary-and-rest
 916                                      (match-beginning pos-url)
 917                                      (match-end pos-url))))
 918             (list (if cla (cons 'cla cla) nil)
 919                   (if des (cons 'des des) nil)
 920                   (if loc (cons 'loc loc) nil)
 921                   (if org (cons 'org org) nil)
 922                   (if sta (cons 'sta sta) nil)
 923                   ;;(if sum (cons 'sum sum) nil)
 924                   (if url (cons 'url url) nil)))))))
 925
 926 ;; subroutines for icalendar-export-region
 927 (defun icalendar--convert-ordinary-to-ical (nonmarker entry-main)
 928   "Convert \"ordinary\" diary entry to icalendar format.
 929 NONMARKER is a regular expression matching the start of non-marking
 930 entries.  ENTRY-MAIN is the first line of the diary entry."
 931   (if (string-match (concat nonmarker
 932                             "\\([^ /]+[ /]+[^ /]+[ /]+[^ ]+\\)\\s-*"
 933                             "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?"
 934                             "\\("
 935                             "-0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?\\)?"
 936                             "\\)?"
 937                             "\\s-*\\(.*?\\) ?$")
 938                     entry-main)
 939       (let* ((datetime (substring entry-main (match-beginning 1)
 940                                   (match-end 1)))
 941              (startisostring (icalendar--datestring-to-isodate
 942                               datetime))
 943              (endisostring (icalendar--datestring-to-isodate
 944                             datetime 1))
 945              (starttimestring (icalendar--diarytime-to-isotime
 946                                (if (match-beginning 3)
 947                                    (substring entry-main
 948                                               (match-beginning 3)
 949                                               (match-end 3))
 950                                  nil)
 951                                (if (match-beginning 4)
 952                                    (substring entry-main
 953                                               (match-beginning 4)
 954                                               (match-end 4))
 955                                  nil)))
 956              (endtimestring (icalendar--diarytime-to-isotime
 957                              (if (match-beginning 6)
 958                                  (substring entry-main
 959                                             (match-beginning 6)
 960                                             (match-end 6))
 961                                nil)
 962                              (if (match-beginning 7)
 963                                  (substring entry-main
 964                                             (match-beginning 7)
 965                                             (match-end 7))
 966                                nil)))
 967              (summary (icalendar--convert-string-for-export
 968                        (substring entry-main (match-beginning 8)
 969                                   (match-end 8)))))
 970         (icalendar--dmsg "ordinary %s" entry-main)
 971
 972         (unless startisostring
 973           (error "Could not parse date"))
 974         (when starttimestring
 975           (unless endtimestring
 976             (let ((time
 977                    (read (icalendar--rris "^T0?" ""
 978                                           starttimestring))))
 979               (setq endtimestring (format "T%06d"
 980                                           (+ 10000 time))))))
 981         (list (concat "\nDTSTART;"
 982                       (if starttimestring "VALUE=DATE-TIME:"
 983                         "VALUE=DATE:")
 984                       startisostring
 985                       (or starttimestring "")
 986                       "\nDTEND;"
 987                       (if endtimestring "VALUE=DATE-TIME:"
 988                         "VALUE=DATE:")
 989                       (if starttimestring
 990                           startisostring
 991                         endisostring)
 992                       (or endtimestring ""))
 993               summary))
 994     ;; no match
 995     nil))
 996
 997 (defun icalendar--convert-weekly-to-ical (nonmarker entry-main)
 998   "Convert weekly diary entry to icalendar format.
 999 NONMARKER is a regular expression matching the start of non-marking
1000 entries.  ENTRY-MAIN is the first line of the diary entry."
1001   (if (and (string-match (concat nonmarker
1002                                  "\\([a-z]+\\)\\s-+"
1003                                  "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)"
1004                                  "\\([ap]m\\)?"
1005                                  "\\(-0?"
1006                                  "\\([1-9][0-9]?:[0-9][0-9]\\)"
1007                                  "\\([ap]m\\)?\\)?"
1008                                  "\\)?"
1009                                  "\\s-*\\(.*?\\) ?$")
1010                          entry-main)
1011            (icalendar--get-weekday-abbrev
1012             (substring entry-main (match-beginning 1)
1013                        (match-end 1))))
1014       (let* ((day (icalendar--get-weekday-abbrev
1015                    (substring entry-main (match-beginning 1)
1016                               (match-end 1))))
1017              (starttimestring (icalendar--diarytime-to-isotime
1018                                (if (match-beginning 3)
1019                                    (substring entry-main
1020                                               (match-beginning 3)
1021                                               (match-end 3))
1022                                  nil)
1023                                (if (match-beginning 4)
1024                                    (substring entry-main
1025                                               (match-beginning 4)
1026                                               (match-end 4))
1027                                  nil)))
1028              (endtimestring (icalendar--diarytime-to-isotime
1029                              (if (match-beginning 6)
1030                                  (substring entry-main
1031                                             (match-beginning 6)
1032                                             (match-end 6))
1033                                nil)
1034                              (if (match-beginning 7)
1035                                  (substring entry-main
1036                                             (match-beginning 7)
1037                                             (match-end 7))
1038                                nil)))
1039              (summary (icalendar--convert-string-for-export
1040                        (substring entry-main (match-beginning 8)
1041                                   (match-end 8)))))
1042         (icalendar--dmsg "weekly %s" entry-main)
1043
1044         (when starttimestring
1045           (unless endtimestring
1046             (let ((time (read
1047                          (icalendar--rris "^T0?" ""
1048                                           starttimestring))))
1049               (setq endtimestring (format "T%06d"
1050                                           (+ 10000 time))))))
1051         (list (concat "\nDTSTART;"
1052                       (if starttimestring
1053                           "VALUE=DATE-TIME:"
1054                         "VALUE=DATE:")
1055                       ;; find the correct week day,
1056                       ;; 1st january 2000 was a saturday
1057                       (format
1058                        "200001%02d"
1059                        (+ (icalendar--get-weekday-number day) 2))
1060                       (or starttimestring "")
1061                       "\nDTEND;"
1062                       (if endtimestring
1063                           "VALUE=DATE-TIME:"
1064                         "VALUE=DATE:")
1065                       (format
1066                        "200001%02d"
1067                        ;; end is non-inclusive!
1068                        (+ (icalendar--get-weekday-number day)
1069                           (if endtimestring 2 3)))
1070                       (or endtimestring "")
1071                       "\nRRULE:FREQ=WEEKLY;INTERVAL=1;BYDAY="
1072                       day)
1073               summary))
1074     ;; no match
1075     nil))
1076
1077 (defun icalendar--convert-yearly-to-ical (nonmarker entry-main)
1078   "Convert yearly diary entry to icalendar format.
1079 NONMARKER is a regular expression matching the start of non-marking
1080 entries.  ENTRY-MAIN is the first line of the diary entry."
1081   (if (string-match (concat nonmarker
1082                             (if european-calendar-style
1083                                 "0?\\([1-9]+[0-9]?\\)\\s-+\\([a-z]+\\)\\s-+"
1084                               "\\([a-z]+\\)\\s-+0?\\([1-9]+[0-9]?\\)\\s-+")
1085                             "\\*?\\s-*"
1086                             "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?"
1087                             "\\("
1088                             "-0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?\\)?"
1089                             "\\)?"
1090                             "\\s-*\\([^0-9]+.*?\\) ?$" ; must not match years
1091                             )
1092                     entry-main)
1093       (let* ((daypos (if european-calendar-style 1 2))
1094              (monpos (if european-calendar-style 2 1))
1095              (day (read (substring entry-main
1096                                    (match-beginning daypos)
1097                                    (match-end daypos))))
1098              (month (icalendar--get-month-number
1099                      (substring entry-main
1100                                 (match-beginning monpos)
1101                                 (match-end monpos))))
1102              (starttimestring (icalendar--diarytime-to-isotime
1103                                (if (match-beginning 4)
1104                                    (substring entry-main
1105                                               (match-beginning 4)
1106                                               (match-end 4))
1107                                  nil)
1108                                (if (match-beginning 5)
1109                                    (substring entry-main
1110                                               (match-beginning 5)
1111                                               (match-end 5))
1112                                  nil)))
1113              (endtimestring (icalendar--diarytime-to-isotime
1114                              (if (match-beginning 7)
1115                                  (substring entry-main
1116                                             (match-beginning 7)
1117                                             (match-end 7))
1118                                nil)
1119                              (if (match-beginning 8)
1120                                  (substring entry-main
1121                                             (match-beginning 8)
1122                                             (match-end 8))
1123                                nil)))
1124              (summary (icalendar--convert-string-for-export
1125                        (substring entry-main (match-beginning 9)
1126                                   (match-end 9)))))
1127         (icalendar--dmsg "yearly %s" entry-main)
1128
1129         (when starttimestring
1130           (unless endtimestring
1131             (let ((time (read
1132                          (icalendar--rris "^T0?" ""
1133                                           starttimestring))))
1134               (setq endtimestring (format "T%06d"
1135                                           (+ 10000 time))))))
1136         (list (concat "\nDTSTART;"
1137                       (if starttimestring "VALUE=DATE-TIME:"
1138                         "VALUE=DATE:")
1139                       (format "1900%02d%02d" month day)
1140                       (or starttimestring "")
1141                       "\nDTEND;"
1142                       (if endtimestring "VALUE=DATE-TIME:"
1143                         "VALUE=DATE:")
1144                       ;; end is not included! shift by one day
1145                       (icalendar--date-to-isodate
1146                        (list month day 1900)
1147                        (if endtimestring 0 1))
1148                       (or endtimestring "")
1149                       "\nRRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH="
1150                       (format "%2d" month)
1151                       ";BYMONTHDAY="
1152                       (format "%2d" day))
1153               summary))
1154     ;; no match
1155     nil))
1156
1157 (defun icalendar--convert-sexp-to-ical (nonmarker entry-main)
1158   "Convert complex sexp diary entry to icalendar format -- unsupported!
1159
1160 FIXME!
1161
1162 NONMARKER is a regular expression matching the start of non-marking
1163 entries.  ENTRY-MAIN is the first line of the diary entry."
1164   (cond ((string-match (concat nonmarker
1165                                "%%(and \\(([^)]+)\\))\\(\\s-*.*?\\) ?$")
1166                        entry-main)
1167          ;; simple sexp entry as generated by icalendar.el: strip off the
1168          ;; unnecessary (and)
1169          (icalendar--dmsg "diary-sexp from icalendar.el %s" entry-main)
1170          (icalendar--convert-to-ical
1171           nonmarker
1172           (concat "%%"
1173                   (substring entry-main (match-beginning 1) (match-end 1))
1174                   (substring entry-main (match-beginning 2) (match-end 2)))))
1175         ((string-match (concat nonmarker
1176                                "%%([^)]+)\\s-*.*")
1177                        entry-main)
1178          (icalendar--dmsg "diary-sexp %s" entry-main)
1179          (error "Sexp-entries are not supported yet"))
1180         (t
1181          ;; no match
1182          nil)))
1183
1184 (defun icalendar--convert-block-to-ical (nonmarker entry-main)
1185   "Convert block diary entry to icalendar format.
1186 NONMARKER is a regular expression matching the start of non-marking
1187 entries.  ENTRY-MAIN is the first line of the diary entry."
1188   (if (string-match (concat nonmarker
1189                             "%%(diary-block \\([^ /]+[ /]+[^ /]+[ /]+[^ ]+\\)"
1190                             " +\\([^ /]+[ /]+[^ /]+[ /]+[^ ]+\\))\\s-*"
1191                             "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?"
1192                             "\\("
1193                             "-0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?\\)?"
1194                             "\\)?"
1195                             "\\s-*\\(.*?\\) ?$")
1196                     entry-main)
1197       (let* ((startstring (substring entry-main
1198                                      (match-beginning 1)
1199                                      (match-end 1)))
1200              (endstring (substring entry-main
1201                                    (match-beginning 2)
1202                                    (match-end 2)))
1203              (startisostring (icalendar--datestring-to-isodate
1204                               startstring))
1205              (endisostring (icalendar--datestring-to-isodate
1206                             endstring))
1207              (endisostring+1 (icalendar--datestring-to-isodate
1208                               endstring 1))
1209              (starttimestring (icalendar--diarytime-to-isotime
1210                                (if (match-beginning 4)
1211                                    (substring entry-main
1212                                               (match-beginning 4)
1213                                               (match-end 4))
1214                                  nil)
1215                                (if (match-beginning 5)
1216                                    (substring entry-main
1217                                               (match-beginning 5)
1218                                               (match-end 5))
1219                                  nil)))
1220              (endtimestring (icalendar--diarytime-to-isotime
1221                              (if (match-beginning 7)
1222                                  (substring entry-main
1223                                             (match-beginning 7)
1224                                             (match-end 7))
1225                                nil)
1226                              (if (match-beginning 8)
1227                                  (substring entry-main
1228                                             (match-beginning 8)
1229                                             (match-end 8))
1230                                nil)))
1231              (summary (icalendar--convert-string-for-export
1232                        (substring entry-main (match-beginning 9)
1233                                   (match-end 9)))))
1234         (icalendar--dmsg "diary-block %s" entry-main)
1235         (when starttimestring
1236           (unless endtimestring
1237             (let ((time
1238                    (read (icalendar--rris "^T0?" ""
1239                                           starttimestring))))
1240               (setq endtimestring (format "T%06d"
1241                                           (+ 10000 time))))))
1242         (if starttimestring
1243             ;; with time -> write rrule
1244             (list (concat "\nDTSTART;VALUE=DATE-TIME:"
1245                           startisostring
1246                           starttimestring
1247                           "\nDTEND;VALUE=DATE-TIME:"
1248                           startisostring
1249                           endtimestring
1250                           "\nRRULE:FREQ=DAILY;INTERVAL=1;UNTIL="
1251                           endisostring)
1252                   summary)
1253           ;; no time -> write long event
1254           (list (concat "\nDTSTART;VALUE=DATE:" startisostring
1255                         "\nDTEND;VALUE=DATE:" endisostring+1)
1256                 summary)))
1257     ;; no match
1258     nil))
1259
1260 (defun icalendar--convert-float-to-ical (nonmarker entry-main)
1261   "Convert float diary entry to icalendar format -- unsupported!
1262
1263 FIXME!
1264
1265 NONMARKER is a regular expression matching the start of non-marking
1266 entries.  ENTRY-MAIN is the first line of the diary entry."
1267   (if (string-match (concat nonmarker
1268                             "%%(diary-float \\([^)]+\\))\\s-*\\(.*?\\) ?$")
1269                     entry-main)
1270       (progn
1271         (icalendar--dmsg "diary-float %s" entry-main)
1272         (error "`diary-float' is not supported yet"))
1273     ;; no match
1274     nil))
1275
1276 (defun icalendar--convert-date-to-ical (nonmarker entry-main)
1277   "Convert `diary-date' diary entry to icalendar format -- unsupported!
1278
1279 FIXME!
1280
1281 NONMARKER is a regular expression matching the start of non-marking
1282 entries.  ENTRY-MAIN is the first line of the diary entry."
1283   (if (string-match (concat nonmarker
1284                             "%%(diary-date \\([^)]+\\))\\s-*\\(.*?\\) ?$")
1285                     entry-main)
1286       (progn
1287         (icalendar--dmsg "diary-date %s" entry-main)
1288         (error "`diary-date' is not supported yet"))
1289     ;; no match
1290     nil))
1291
1292 (defun icalendar--convert-cyclic-to-ical (nonmarker entry-main)
1293   "Convert `diary-cyclic' diary entry to icalendar format.
1294 NONMARKER is a regular expression matching the start of non-marking
1295 entries.  ENTRY-MAIN is the first line of the diary entry."
1296   (if (string-match (concat nonmarker
1297                             "%%(diary-cyclic \\([^ ]+\\) +"
1298                             "\\([^ /]+[ /]+[^ /]+[ /]+[^ ]+\\))\\s-*"
1299                             "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?"
1300                             "\\("
1301                             "-0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?\\)?"
1302                             "\\)?"
1303                             "\\s-*\\(.*?\\) ?$")
1304                     entry-main)
1305       (let* ((frequency (substring entry-main (match-beginning 1)
1306                                    (match-end 1)))
1307              (datetime (substring entry-main (match-beginning 2)
1308                                   (match-end 2)))
1309              (startisostring (icalendar--datestring-to-isodate
1310                               datetime))
1311              (endisostring (icalendar--datestring-to-isodate
1312                             datetime))
1313              (endisostring+1 (icalendar--datestring-to-isodate
1314                               datetime 1))
1315              (starttimestring (icalendar--diarytime-to-isotime
1316                                (if (match-beginning 4)
1317                                    (substring entry-main
1318                                               (match-beginning 4)
1319                                               (match-end 4))
1320                                  nil)
1321                                (if (match-beginning 5)
1322                                    (substring entry-main
1323                                               (match-beginning 5)
1324                                               (match-end 5))
1325                                  nil)))
1326              (endtimestring (icalendar--diarytime-to-isotime
1327                              (if (match-beginning 7)
1328                                  (substring entry-main
1329                                             (match-beginning 7)
1330                                             (match-end 7))
1331                                nil)
1332                              (if (match-beginning 8)
1333                                  (substring entry-main
1334                                             (match-beginning 8)
1335                                             (match-end 8))
1336                                nil)))
1337              (summary (icalendar--convert-string-for-export
1338                        (substring entry-main (match-beginning 9)
1339                                   (match-end 9)))))
1340         (icalendar--dmsg "diary-cyclic %s" entry-main)
1341         (when starttimestring
1342           (unless endtimestring
1343             (let ((time
1344                    (read (icalendar--rris "^T0?" ""
1345                                           starttimestring))))
1346               (setq endtimestring (format "T%06d"
1347                                           (+ 10000 time))))))
1348         (list (concat "\nDTSTART;"
1349                       (if starttimestring "VALUE=DATE-TIME:"
1350                         "VALUE=DATE:")
1351                       startisostring
1352                       (or starttimestring "")
1353                       "\nDTEND;"
1354                       (if endtimestring "VALUE=DATE-TIME:"
1355                         "VALUE=DATE:")
1356                       (if endtimestring endisostring endisostring+1)
1357                       (or endtimestring "")
1358                       "\nRRULE:FREQ=DAILY;INTERVAL=" frequency
1359                       ;; strange: korganizer does not expect
1360                       ;; BYSOMETHING here...
1361                       )
1362               summary))
1363     ;; no match
1364     nil))
1365
1366 (defun icalendar--convert-anniversary-to-ical (nonmarker entry-main)
1367   "Convert `diary-anniversary' diary entry to icalendar format.
1368 NONMARKER is a regular expression matching the start of non-marking
1369 entries.  ENTRY-MAIN is the first line of the diary entry."
1370   (if (string-match (concat nonmarker
1371                             "%%(diary-anniversary \\([^)]+\\))\\s-*"
1372                             "\\(0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?"
1373                             "\\("
1374                             "-0?\\([1-9][0-9]?:[0-9][0-9]\\)\\([ap]m\\)?\\)?"
1375                             "\\)?"
1376                             "\\s-*\\(.*?\\) ?$")
1377                     entry-main)
1378       (let* ((datetime (substring entry-main (match-beginning 1)
1379                                   (match-end 1)))
1380              (startisostring (icalendar--datestring-to-isodate
1381                               datetime))
1382              (endisostring (icalendar--datestring-to-isodate
1383                             datetime 1))
1384              (starttimestring (icalendar--diarytime-to-isotime
1385                                (if (match-beginning 3)
1386                                    (substring entry-main
1387                                               (match-beginning 3)
1388                                               (match-end 3))
1389                                  nil)
1390                                (if (match-beginning 4)
1391                                    (substring entry-main
1392                                               (match-beginning 4)
1393                                               (match-end 4))
1394                                  nil)))
1395              (endtimestring (icalendar--diarytime-to-isotime
1396                              (if (match-beginning 6)
1397                                  (substring entry-main
1398                                             (match-beginning 6)
1399                                             (match-end 6))
1400                                nil)
1401                              (if (match-beginning 7)
1402                                  (substring entry-main
1403                                             (match-beginning 7)
1404                                             (match-end 7))
1405                                nil)))
1406              (summary (icalendar--convert-string-for-export
1407                        (substring entry-main (match-beginning 8)
1408                                   (match-end 8)))))
1409         (icalendar--dmsg "diary-anniversary %s" entry-main)
1410         (when starttimestring
1411           (unless endtimestring
1412             (let ((time
1413                    (read (icalendar--rris "^T0?" ""
1414                                           starttimestring))))
1415               (setq endtimestring (format "T%06d"
1416                                           (+ 10000 time))))))
1417         (list (concat "\nDTSTART;"
1418                       (if starttimestring "VALUE=DATE-TIME:"
1419                         "VALUE=DATE:")
1420                       startisostring
1421                       (or starttimestring "")
1422                       "\nDTEND;"
1423                       (if endtimestring "VALUE=DATE-TIME:"
1424                         "VALUE=DATE:")
1425                       endisostring
1426                       (or endtimestring "")
1427                       "\nRRULE:FREQ=YEARLY;INTERVAL=1"
1428                       ;; the following is redundant,
1429                       ;; but korganizer seems to expect this... ;(
1430                       ;; and evolution doesn't understand it... :(
1431                       ;; so... who is wrong?!
1432                       ";BYMONTH="
1433                       (substring startisostring 4 6)
1434                       ";BYMONTHDAY="
1435                       (substring startisostring 6 8))
1436               summary))
1437     ;; no match
1438     nil))
1439
1440 ;; ======================================================================
1441 ;; Import -- convert icalendar to emacs-diary
1442 ;; ======================================================================
1443
1444 ;;;###autoload
1445 (defun icalendar-import-file (ical-filename diary-filename
1446                                             &optional non-marking)
1447   "Import an iCalendar file and append to a diary file.
1448 Argument ICAL-FILENAME output iCalendar file.
1449 Argument DIARY-FILENAME input `diary-file'.
1450 Optional argument NON-MARKING determines whether events are created as
1451 non-marking or not."
1452   (interactive "fImport iCalendar data from file:
1453 Finto diary file:
1454 p")
1455   ;; clean up the diary file
1456   (save-current-buffer
1457     ;; now load and convert from the ical file
1458     (set-buffer (find-file ical-filename))
1459     (icalendar-import-buffer diary-filename t non-marking)))
1460
1461 ;;;###autoload
1462 (defun icalendar-import-buffer (&optional diary-file do-not-ask
1463                                           non-marking)
1464   "Extract iCalendar events from current buffer.
1465
1466 This function searches the current buffer for the first iCalendar
1467 object, reads it and adds all VEVENT elements to the diary
1468 DIARY-FILE.
1469
1470 It will ask for each appointment whether to add it to the diary
1471 when DO-NOT-ASK is non-nil.  When called interactively,
1472 DO-NOT-ASK is set to t, so that you are asked fore each event.
1473
1474 NON-MARKING determines whether diary events are created as
1475 non-marking.
1476
1477 Return code t means that importing worked well, return code nil
1478 means that an error has occured.  Error messages will be in the
1479 buffer `*icalendar-errors*'."
1480   (interactive)
1481   (save-current-buffer
1482     ;; prepare ical
1483     (message "Preparing icalendar...")
1484     (set-buffer (icalendar--get-unfolded-buffer (current-buffer)))
1485     (goto-char (point-min))
1486     (message "Preparing icalendar...done")
1487     (if (re-search-forward "^BEGIN:VCALENDAR\\s-*$" nil t)
1488         (let (ical-contents ical-errors)
1489           ;; read ical
1490           (message "Reading icalendar...")
1491           (beginning-of-line)
1492           (setq ical-contents (icalendar--read-element nil nil))
1493           (message "Reading icalendar...done")
1494           ;; convert ical
1495           (message "Converting icalendar...")
1496           (setq ical-errors (icalendar--convert-ical-to-diary
1497                              ical-contents
1498                              diary-file do-not-ask non-marking))
1499           (when diary-file
1500             ;; save the diary file if it is visited already
1501             (let ((b (find-buffer-visiting diary-file)))
1502               (when b
1503                 (save-current-buffer
1504                   (set-buffer b)
1505                   (save-buffer)))))
1506           (message "Converting icalendar...done")
1507           ;; return t if no error occured
1508           (not ical-errors))
1509       (message
1510        "Current buffer does not contain icalendar contents!")
1511       ;; return nil, i.e. import did not work
1512       nil)))
1513
1514 (defalias 'icalendar-extract-ical-from-buffer 'icalendar-import-buffer)
1515 (make-obsolete 'icalendar-extract-ical-from-buffer 'icalendar-import-buffer)
1516
1517 (defun icalendar--format-ical-event (event)
1518   "Create a string representation of an iCalendar EVENT."
1519   (let ((string icalendar-import-format)
1520         (conversion-list
1521          '(("%c" CLASS       icalendar-import-format-class)
1522            ("%d" DESCRIPTION icalendar-import-format-description)
1523            ("%l" LOCATION    icalendar-import-format-location)
1524            ("%o" ORGANIZER   icalendar-import-format-organizer)
1525            ("%s" SUMMARY     icalendar-import-format-summary)
1526            ("%t" STATUS      icalendar-import-format-status)
1527            ("%u" URL         icalendar-import-format-url))))
1528     ;; convert the specifiers in the format string
1529     (mapcar (lambda (i)
1530               (let* ((spec (car i))
1531                      (prop (cadr i))
1532                      (format (car (cddr i)))
1533                      (contents (icalendar--get-event-property event prop))
1534                      (formatted-contents ""))
1535                 (when (and contents (> (length contents) 0))
1536                   (setq formatted-contents
1537                         (icalendar--rris "%s"
1538                                          (icalendar--convert-string-for-import
1539                                           contents)
1540                                          (symbol-value format)
1541                                          t t)))
1542                 (setq string (icalendar--rris spec
1543                                               formatted-contents
1544                                               string
1545                                               t t))))
1546             conversion-list)
1547     string))
1548
1549 (defun icalendar--convert-ical-to-diary (ical-list diary-file
1550                                                    &optional do-not-ask
1551                                                    non-marking)
1552   "Convert Calendar data to an Emacs diary file.
1553 Import VEVENTS from the iCalendar object ICAL-LIST and saves them to a
1554 DIARY-FILE.  If DO-NOT-ASK is nil the user is asked for each event
1555 whether to actually import it.  NON-MARKING determines whether diary
1556 events are created as non-marking.
1557 This function attempts to return t if something goes wrong.  In this
1558 case an error string which describes all the errors and problems is
1559 written into the buffer `*icalendar-errors*'."
1560   (let* ((ev (icalendar--all-events ical-list))
1561          (error-string "")
1562          (event-ok t)
1563          (found-error nil)
1564          e diary-string)
1565     ;; step through all events/appointments
1566     (while ev
1567       (setq e (car ev))
1568       (setq ev (cdr ev))
1569       (setq event-ok nil)
1570       (condition-case error-val
1571           (let* ((dtstart (icalendar--get-event-property e 'DTSTART))
1572                  (dtstart-dec (icalendar--decode-isodatetime dtstart))
1573                  (start-d (icalendar--datetime-to-diary-date
1574                            dtstart-dec))
1575                  (start-t (icalendar--datetime-to-colontime dtstart-dec))
1576                  (dtend (icalendar--get-event-property e 'DTEND))
1577                  (dtend-dec (icalendar--decode-isodatetime dtend))
1578                  (dtend-1-dec (icalendar--decode-isodatetime dtend -1))
1579                  end-d
1580                  end-1-d
1581                  end-t
1582                  (summary (icalendar--convert-string-for-import
1583                            (or (icalendar--get-event-property e 'SUMMARY)
1584                                "No summary")))
1585                  (rrule (icalendar--get-event-property e 'RRULE))
1586                  (rdate (icalendar--get-event-property e 'RDATE))
1587                  (duration (icalendar--get-event-property e 'DURATION)))
1588             (icalendar--dmsg "%s: `%s'" start-d summary)
1589             ;; check whether start-time is missing
1590             (if  (and dtstart
1591                       (string=
1592                        (cadr (icalendar--get-event-property-attributes
1593                               e 'DTSTART))
1594                        "DATE"))
1595                 (setq start-t nil))
1596             (when duration
1597               (let ((dtend-dec-d (icalendar--add-decoded-times
1598                                   dtstart-dec
1599                                   (icalendar--decode-isoduration duration)))
1600                     (dtend-1-dec-d (icalendar--add-decoded-times
1601                                     dtstart-dec
1602                                     (icalendar--decode-isoduration duration
1603                                                                    t))))
1604                 (if (and dtend-dec (not (eq dtend-dec dtend-dec-d)))
1605                     (message "Inconsistent endtime and duration for %s"
1606                              summary))
1607                 (setq dtend-dec dtend-dec-d)
1608                 (setq dtend-1-dec dtend-1-dec-d)))
1609             (setq end-d (if dtend-dec
1610                             (icalendar--datetime-to-diary-date dtend-dec)
1611                           start-d))
1612             (setq end-1-d (if dtend-1-dec
1613                               (icalendar--datetime-to-diary-date dtend-1-dec)
1614                             start-d))
1615             (setq end-t (if (and
1616                              dtend-dec
1617                              (not (string=
1618                                    (cadr
1619                                     (icalendar--get-event-property-attributes
1620                                      e 'DTEND))
1621                                    "DATE")))
1622                             (icalendar--datetime-to-colontime dtend-dec)
1623                           start-t))
1624             (icalendar--dmsg "start-d: %s, end-d: %s" start-d end-d)
1625             (cond
1626              ;; recurring event
1627              (rrule
1628               (setq diary-string
1629                     (icalendar--convert-recurring-to-diary e dtstart-dec start-t
1630                                                            end-t))
1631               (setq event-ok t))
1632              (rdate
1633               (icalendar--dmsg "rdate event")
1634               (setq diary-string "")
1635               (mapcar (lambda (datestring)
1636                         (setq diary-string
1637                               (concat diary-string
1638                                       (format "......"))))
1639                       (icalendar--split-value rdate)))
1640              ;; non-recurring event
1641              ;; all-day event
1642              ((not (string= start-d end-d))
1643               (setq diary-string
1644                     (icalendar--convert-non-recurring-all-day-to-diary
1645                      e start-d end-1-d))
1646               (setq event-ok t))
1647              ;; not all-day
1648              ((and start-t (or (not end-t)
1649                                (not (string= start-t end-t))))
1650               (setq diary-string
1651                     (icalendar--convert-non-recurring-not-all-day-to-diary
1652                      e dtstart-dec dtend-dec start-t end-t))
1653               (setq event-ok t))
1654              ;; all-day event
1655              (t
1656               (icalendar--dmsg "all day event")
1657               (setq diary-string (icalendar--datetime-to-diary-date
1658                                   dtstart-dec "/"))
1659               (setq event-ok t)))
1660             ;; add all other elements unless the user doesn't want to have
1661             ;; them
1662             (if event-ok
1663                 (progn
1664                   (setq diary-string
1665                         (concat diary-string " "
1666                                 (icalendar--format-ical-event e)))
1667                   (if do-not-ask (setq summary nil))
1668                   (icalendar--add-diary-entry diary-string diary-file
1669                                               non-marking summary))
1670               ;; event was not ok
1671               (setq found-error t)
1672               (setq error-string
1673                     (format "%s\nCannot handle this event:%s"
1674                             error-string e))))
1675         ;; FIXME: inform user about ignored event properties
1676         ;; handle errors
1677         (error
1678          (message "Ignoring event \"%s\"" e)
1679          (setq found-error t)
1680          (setq error-string (format "%s\n%s\nCannot handle this event: %s"
1681                                     error-val error-string e))
1682          (message "%s" error-string))))
1683     (if found-error
1684         (save-current-buffer
1685           (set-buffer (get-buffer-create "*icalendar-errors*"))
1686           (erase-buffer)
1687           (insert error-string)))
1688     (message "Converting icalendar...done")
1689     found-error))
1690
1691 ;; subroutines for importing
1692 (defun icalendar--convert-recurring-to-diary (e dtstart-dec start-t end-t)
1693   "Convert recurring icalendar event E to diary format.
1694
1695 DTSTART-DEC is the DTSTART property of E.
1696 START-T is the event's start time in diary format.
1697 END-T is the event's end time in diary format."
1698   (icalendar--dmsg "recurring event")
1699   (let* ((rrule        (icalendar--get-event-property e 'RRULE))
1700          (rrule-props  (icalendar--split-value rrule))
1701          (frequency    (cadr (assoc 'FREQ rrule-props)))
1702          (until        (cadr (assoc 'UNTIL rrule-props)))
1703          (count        (cadr (assoc 'COUNT rrule-props)))
1704          (interval     (read (or (cadr (assoc 'INTERVAL rrule-props)) "1")))
1705          (dtstart-conv (icalendar--datetime-to-diary-date dtstart-dec))
1706          (until-conv   (icalendar--datetime-to-diary-date
1707                         (icalendar--decode-isodatetime until)))
1708          (until-1-conv (icalendar--datetime-to-diary-date
1709                         (icalendar--decode-isodatetime until -1)))
1710          (result  ""))
1711
1712     ;; FIXME FIXME interval!!!!!!!!!!!!!
1713
1714     (when count
1715       (if until
1716           (message "Must not have UNTIL and COUNT -- ignoring COUNT element!")
1717         (let ((until-1 0))
1718           (cond ((string-equal frequency "DAILY")
1719                  (setq until (icalendar--add-decoded-times
1720                               dtstart-dec
1721                               (list 0 0 0 (* (read count) interval) 0 0)))
1722                  (setq until-1 (icalendar--add-decoded-times
1723                                 dtstart-dec
1724                                 (list 0 0 0 (* (- (read count) 1) interval)
1725                                       0 0)))
1726                  )
1727                 ((string-equal frequency "WEEKLY")
1728                  (setq until (icalendar--add-decoded-times
1729                               dtstart-dec
1730                               (list 0 0 0 (* (read count) 7 interval) 0 0)))
1731                  (setq until-1 (icalendar--add-decoded-times
1732                                 dtstart-dec
1733                                 (list 0 0 0 (* (- (read count) 1) 7
1734                                                interval) 0 0)))
1735                  )
1736                 ((string-equal frequency "MONTHLY")
1737                  (setq until (icalendar--add-decoded-times
1738                               dtstart-dec (list 0 0 0 0 (* (- (read count) 1)
1739                                                            interval) 0)))
1740                  (setq until-1 (icalendar--add-decoded-times
1741                                 dtstart-dec (list 0 0 0 0 (* (- (read count) 1)
1742                                                              interval) 0)))
1743                  )
1744                 ((string-equal frequency "YEARLY")
1745                  (setq until (icalendar--add-decoded-times
1746                               dtstart-dec (list 0 0 0 0 0 (* (- (read count) 1)
1747                                                              interval))))
1748                  (setq until-1 (icalendar--add-decoded-times
1749                                 dtstart-dec
1750                                 (list 0 0 0 0 0 (* (- (read count) 1)
1751                                                    interval))))
1752                  )
1753                 (t
1754                  (message "Cannot handle COUNT attribute for `%s' events."
1755                           frequency)))
1756           (setq until-conv (icalendar--datetime-to-diary-date until))
1757           (setq until-1-conv (icalendar--datetime-to-diary-date until-1))
1758           ))
1759       )
1760     (cond ((string-equal frequency "WEEKLY")
1761            (if (not start-t)
1762                (progn
1763                  ;; weekly and all-day
1764                  (icalendar--dmsg "weekly all-day")
1765                  (if until
1766                      (setq result
1767                            (format
1768                             (concat "%%%%(and "
1769                                     "(diary-cyclic %d %s) "
1770                                     "(diary-block %s %s))")
1771                             (* interval 7)
1772                             dtstart-conv
1773                             dtstart-conv
1774                             (if count until-1-conv until-conv)
1775                             ))
1776                    (setq result
1777                          (format "%%%%(and (diary-cyclic %d %s))"
1778                                  (* interval 7)
1779                                  dtstart-conv))))
1780              ;; weekly and not all-day
1781              (let* ((byday (cadr (assoc 'BYDAY rrule-props)))
1782                     (weekday
1783                      (icalendar--get-weekday-number byday)))
1784                (icalendar--dmsg "weekly not-all-day")
1785                (if until
1786                    (setq result
1787                          (format
1788                           (concat "%%%%(and "
1789                                   "(diary-cyclic %d %s) "
1790                                   "(diary-block %s %s)) "
1791                                   "%s%s%s")
1792                           (* interval 7)
1793                           dtstart-conv
1794                           dtstart-conv
1795                           until-conv
1796                           (or start-t "")
1797                           (if end-t "-" "") (or end-t "")))
1798                  ;; no limit
1799                  ;; FIXME!!!!
1800                  ;; DTSTART;VALUE=DATE-TIME:20030919T090000
1801                  ;; DTEND;VALUE=DATE-TIME:20030919T113000
1802                  (setq result
1803                        (format
1804                         "%%%%(and (diary-cyclic %s %s)) %s%s%s"
1805                         (* interval 7)
1806                         dtstart-conv
1807                         (or start-t "")
1808                         (if end-t "-" "") (or end-t "")))))))
1809           ;; yearly
1810           ((string-equal frequency "YEARLY")
1811            (icalendar--dmsg "yearly")
1812            (if until
1813                (setq result (format
1814                              (concat "%%%%(and (diary-date %s %s t) "
1815                                      "(diary-block %s %s)) %s%s%s")
1816                              (if european-calendar-style (nth 3 dtstart-dec)
1817                                (nth 4 dtstart-dec))
1818                              (if european-calendar-style (nth 4 dtstart-dec)
1819                                (nth 3 dtstart-dec))
1820                              dtstart-conv
1821                              until-conv
1822                              (or start-t "")
1823                              (if end-t "-" "") (or end-t "")))
1824              (setq result (format
1825                            "%%%%(and (diary-anniversary %s)) %s%s%s"
1826                            dtstart-conv
1827                            (or start-t "")
1828                            (if end-t "-" "") (or end-t "")))))
1829           ;; monthly
1830           ((string-equal frequency "MONTHLY")
1831            (icalendar--dmsg "monthly")
1832            (setq result
1833                  (format
1834                   "%%%%(and (diary-date %s %s %s) (diary-block %s %s)) %s%s%s"
1835                   (if european-calendar-style (nth 3 dtstart-dec) "t")
1836                   (if european-calendar-style "t" (nth 3 dtstart-dec))
1837                   "t"
1838                   dtstart-conv
1839                   (if until
1840                       until-conv
1841                     "1 1 9999") ;; FIXME: should be unlimited
1842                   (or start-t "")
1843                   (if end-t "-" "") (or end-t ""))))
1844           ;; daily
1845           ((and (string-equal frequency "DAILY"))
1846            (if until
1847                (setq result
1848                      (format
1849                       (concat "%%%%(and (diary-cyclic %s %s) "
1850                               "(diary-block %s %s)) %s%s%s")
1851                       interval dtstart-conv dtstart-conv
1852                       (if count until-1-conv until-conv)
1853                       (or start-t "")
1854                       (if end-t "-" "") (or end-t "")))
1855              (setq result
1856                    (format
1857                     "%%%%(and (diary-cyclic %s %s)) %s%s%s"
1858                     interval
1859                     dtstart-conv
1860                     (or start-t "")
1861                     (if end-t "-" "") (or end-t ""))))))
1862     ;; Handle exceptions from recurrence rules
1863     (let ((ex-dates (icalendar--get-event-properties e 'EXDATE)))
1864       (while ex-dates
1865         (let* ((ex-start (icalendar--decode-isodatetime
1866                           (car ex-dates)))
1867                (ex-d (icalendar--datetime-to-diary-date
1868                       ex-start)))
1869           (setq result
1870                 (icalendar--rris "^%%(\\(and \\)?"
1871                                  (format
1872                                   "%%%%(and (not (diary-date %s)) "
1873                                   ex-d)
1874                                  result)))
1875         (setq ex-dates (cdr ex-dates))))
1876     ;; FIXME: exception rules are not recognized
1877     (if (icalendar--get-event-property e 'EXRULE)
1878         (setq result
1879               (concat result
1880                       "\n Exception rules: "
1881                       (icalendar--get-event-properties
1882                        e 'EXRULE))))
1883     result))
1884
1885 (defun icalendar--convert-non-recurring-all-day-to-diary (event start-d end-d)
1886   "Convert non-recurring icalendar EVENT to diary format.
1887
1888 DTSTART is the decoded DTSTART property of E.
1889 Argument START-D gives the first day.
1890 Argument END-D gives the last day."
1891   (icalendar--dmsg "non-recurring all-day event")
1892   (format "%%%%(and (diary-block %s %s))" start-d end-d))
1893
1894 (defun icalendar--convert-non-recurring-not-all-day-to-diary (event dtstart-dec
1895                                                                     dtend-dec
1896                                                                     start-t
1897                                                                     end-t)
1898   "Convert recurring icalendar EVENT to diary format.
1899
1900 DTSTART-DEC is the decoded DTSTART property of E.
1901 DTEND-DEC is the decoded DTEND property of E.
1902 START-T is the event's start time in diary format.
1903 END-T is the event's end time in diary format."
1904   (icalendar--dmsg "not all day event")
1905   (cond (end-t
1906          (format "%s %s-%s"
1907                  (icalendar--datetime-to-diary-date
1908                   dtstart-dec "/")
1909                  start-t end-t))
1910         (t
1911          (format "%s %s"
1912                  (icalendar--datetime-to-diary-date
1913                   dtstart-dec "/")
1914                  start-t))))
1915
1916 (defun icalendar--add-diary-entry (string diary-file non-marking
1917                                           &optional summary)
1918   "Add STRING to the diary file DIARY-FILE.
1919 STRING must be a properly formatted valid diary entry.  NON-MARKING
1920 determines whether diary events are created as non-marking.  If
1921 SUMMARY is not nil it must be a string that gives the summary of the
1922 entry.  In this case the user will be asked whether he wants to insert
1923 the entry."
1924   (when (or (not summary)
1925             (y-or-n-p (format "Add appointment for `%s' to diary? "
1926                               summary)))
1927     (when summary
1928       (setq non-marking
1929             (y-or-n-p (format "Make appointment non-marking? "))))
1930     (save-window-excursion
1931       (unless diary-file
1932         (setq diary-file
1933               (read-file-name "Add appointment to this diary file: ")))
1934       ;; Note: make-diary-entry will add a trailing blank char.... :(
1935       (make-diary-entry string non-marking diary-file))))
1936
1937 (provide 'icalendar)
1938
1939 ;; arch-tag: 74fdbe8e-0451-4e38-bb61-4416e822f4fc
1940 ;;; icalendar.el ends here