contrib/lisp/org-expiry.el

   1 ;;; org-expiry.el --- expiry mechanism for Org entries
   2 ;;
   3 ;; Copyright 2007-2013 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Bastien Guerry
   6 ;; Version: 0.2
   7 ;; Keywords: org expiry
   8
   9 ;; This file is not part of GNU Emacs.
  10
  11 ;; This program is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15 ;;
  16 ;; This program is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20 ;;
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23 ;;
  24 ;;; Commentary:
  25 ;;
  26 ;; This gives you a chance to get rid of old entries in your Org files
  27 ;; by expiring them.
  28 ;;
  29 ;; By default, entries that have no EXPIRY property are considered to be
  30 ;; new (i.e. 0 day old) and only entries older than one year go to the
  31 ;; expiry process, which consist in adding the ARCHIVE tag.  None of
  32 ;; your tasks will be deleted with the default settings.
  33 ;;
  34 ;; When does an entry expires?
  35 ;;
  36 ;; Consider this entry:
  37 ;;
  38 ;; * Stop watching TV
  39 ;;   :PROPERTIES:
  40 ;;   :CREATED:  <2008-01-07 lun 08:01>
  41 ;;   :EXPIRY:   <2008-01-09 08:01>
  42 ;;   :END:
  43 ;;
  44 ;; This entry will expire on the 9th, january 2008.
  45
  46 ;; * Stop watching TV
  47 ;;   :PROPERTIES:
  48 ;;   :CREATED:  <2008-01-07 lun 08:01>
  49 ;;   :EXPIRY:   +1w
  50 ;;   :END:
  51 ;;
  52 ;; This entry will expire on the 14th, january 2008, one week after its
  53 ;; creation date.
  54 ;;
  55 ;; What happen when an entry is expired?  Nothing until you explicitely
  56 ;; M-x org-expiry-process-entries When doing this, org-expiry will check
  57 ;; for expired entries and request permission to process them.
  58 ;;
  59 ;; Processing an expired entries means calling the function associated
  60 ;; with `org-expiry-handler-function'; the default is to add the tag
  61 ;; :ARCHIVE:, but you can also add a EXPIRED keyword or even archive
  62 ;; the subtree.
  63 ;;
  64 ;; Is this useful?  Well, when you're in a brainstorming session, it
  65 ;; might be useful to know about the creation date of an entry, and be
  66 ;; able to archive those entries that are more than xxx days/weeks old.
  67 ;;
  68 ;; When you're in such a session, you can insinuate org-expiry like
  69 ;; this: M-x org-expiry-insinuate
  70 ;;
  71 ;; Then, each time you're pressing M-RET to insert an item, the CREATION
  72 ;; property will be automatically added.  Same when you're scheduling or
  73 ;; deadlining items.  You can deinsinuate: M-x org-expiry-deinsinuate
  74
  75 ;;; Code:
  76
  77 ;;; User variables:
  78
  79 (defgroup org-expiry nil
  80   "Org expiry process."
  81   :tag "Org Expiry"
  82   :group 'org)
  83
  84 (defcustom org-expiry-inactive-timestamps nil
  85   "Insert inactive timestamps for created/expired properties."
  86   :type 'boolean
  87   :group 'org-expiry)
  88
  89 (defcustom org-expiry-created-property-name "CREATED"
  90   "The name of the property for setting the creation date."
  91   :type 'string
  92   :group 'org-expiry)
  93
  94 (defcustom org-expiry-expiry-property-name "EXPIRY"
  95   "The name of the property for setting the expiry date/delay."
  96   :type 'string
  97   :group 'org-expiry)
  98
  99 (defcustom org-expiry-keyword "EXPIRED"
 100   "The default keyword for `org-expiry-add-keyword'."
 101   :type 'string
 102   :group 'org-expiry)
 103
 104 (defcustom org-expiry-wait "+1y"
 105   "Time span between the creation date and the expiry.
 106 The default value for this variable (\"+1y\") means that entries
 107 will expire if there are at least one year old.
 108
 109 If the expiry delay cannot be retrieved from the entry or the
 110 subtree above, the expiry process compares the expiry delay with
 111 `org-expiry-wait'.  This can be either an ISO date or a relative
 112 time specification.  See `org-read-date' for details."
 113   :type 'string
 114   :group 'org-expiry)
 115
 116 (defcustom org-expiry-created-date "+0d"
 117   "The default creation date.
 118 The default value of this variable (\"+0d\") means that entries
 119 without a creation date will be handled as if they were created
 120 today.
 121
 122 If the creation date cannot be retrieved from the entry or the
 123 subtree above, the expiry process will compare the expiry delay
 124 with this date.  This can be either an ISO date or a relative
 125 time specification.  See `org-read-date' for details on relative
 126 time specifications."
 127   :type 'string
 128   :group 'org-expiry)
 129
 130 (defcustom org-expiry-handler-function 'org-toggle-archive-tag
 131   "Function to process expired entries.
 132 Possible candidates for this function are:
 133
 134 `org-toggle-archive-tag'
 135 `org-expiry-add-keyword'
 136 `org-expiry-archive-subtree'"
 137   :type 'function
 138   :group 'org-expiry)
 139
 140 (defcustom org-expiry-confirm-flag t
 141   "Non-nil means confirm expiration process."
 142   :type '(choice
 143           (const :tag "Always require confirmation" t)
 144           (const :tag "Do not require confirmation" nil)
 145           (const :tag "Require confirmation in interactive expiry process"
 146                  interactive))
 147   :group 'org-expiry)
 148
 149 (defcustom org-expiry-advised-functions
 150   '(org-scheduled org-deadline org-time-stamp)
 151   "A list of advised functions.
 152 `org-expiry-insinuate' will activate the expiry advice for these
 153 functions.  `org-expiry-deinsinuate' will deactivate them."
 154   :type 'boolean
 155   :group 'list)
 156
 157 ;;; Advices and insinuation:
 158
 159 (defadvice org-schedule (after org-schedule-update-created)
 160   "Update the creation-date property when calling `org-schedule'."
 161   (org-expiry-insert-created))
 162
 163 (defadvice org-deadline (after org-deadline-update-created)
 164   "Update the creation-date property when calling `org-deadline'."
 165   (org-expiry-insert-created))
 166
 167 (defadvice org-time-stamp (after org-time-stamp-update-created)
 168   "Update the creation-date property when calling `org-time-stamp'."
 169   (org-expiry-insert-created))
 170
 171 (defun org-expiry-insinuate (&optional arg)
 172   "Add hooks and activate advices for org-expiry.
 173 If ARG, also add a hook to `before-save-hook' in `org-mode' and
 174 restart `org-mode' if necessary."
 175   (interactive "P")
 176   (ad-activate 'org-schedule)
 177   (ad-activate 'org-time-stamp)
 178   (ad-activate 'org-deadline)
 179   (add-hook 'org-insert-heading-hook 'org-expiry-insert-created)
 180   (add-hook 'org-after-todo-state-change-hook 'org-expiry-insert-created)
 181   (add-hook 'org-after-tags-change-hook 'org-expiry-insert-created)
 182   (when arg
 183     (add-hook 'org-mode-hook
 184               (lambda() (add-hook 'before-save-hook
 185                                   'org-expiry-process-entries t t)))
 186     ;; need this to refresh org-mode hooks
 187     (when (eq major-mode 'org-mode)
 188       (org-mode)
 189       (if (org-called-interactively-p)
 190           (message "Org-expiry insinuated, `org-mode' restarted.")))))
 191
 192 (defun org-expiry-deinsinuate (&optional arg)
 193   "Remove hooks and deactivate advices for org-expiry.
 194 If ARG, also remove org-expiry hook in Org's `before-save-hook'
 195 and restart `org-mode' if necessary."
 196   (interactive "P")
 197   (ad-deactivate 'org-schedule)
 198   (ad-deactivate 'org-time-stamp)
 199   (ad-deactivate 'org-deadline)
 200   (remove-hook 'org-insert-heading-hook 'org-expiry-insert-created)
 201   (remove-hook 'org-after-todo-state-change-hook 'org-expiry-insert-created)
 202   (remove-hook 'org-after-tags-change-hook 'org-expiry-insert-created)
 203   (remove-hook 'org-mode-hook
 204                (lambda() (add-hook 'before-save-hook
 205                                    'org-expiry-process-entries t t)))
 206   (when arg
 207     ;; need this to refresh org-mode hooks
 208     (when (eq major-mode 'org-mode)
 209       (org-mode)
 210       (if (org-called-interactively-p)
 211           (message "Org-expiry de-insinuated, `org-mode' restarted.")))))
 212
 213 ;;; org-expiry-expired-p:
 214
 215 (defun org-expiry-expired-p ()
 216   "Check if the entry at point is expired.
 217 Return nil if the entry is not expired.  Otherwise return the
 218 amount of time between today and the expiry date.
 219
 220 If there is no creation date, use `org-expiry-created-date'.
 221 If there is no expiry date, use `org-expiry-expiry-date'."
 222   (let* ((ex-prop org-expiry-expiry-property-name)
 223          (cr-prop org-expiry-created-property-name)
 224          (ct (current-time))
 225          (cr (org-read-date nil t (or (org-entry-get (point) cr-prop t) "+0d")))
 226          (ex-field (or (org-entry-get (point) ex-prop t) org-expiry-wait))
 227          (ex (if (string-match "^[ \t]?[+-]" ex-field)
 228                  (time-add cr (time-subtract (org-read-date nil t ex-field) ct))
 229                (org-read-date nil t ex-field))))
 230     (if (time-less-p ex ct)
 231         (time-subtract ct ex))))
 232
 233 ;;; Expire an entry or a region/buffer:
 234
 235 (defun org-expiry-process-entry (&optional force)
 236   "Call `org-expiry-handler-function' on entry.
 237 If FORCE is non-nil, don't require confirmation from the user.
 238 Otherwise rely on `org-expiry-confirm-flag' to decide."
 239   (interactive "P")
 240   (save-excursion
 241     (when (org-called-interactively-p) (org-reveal))
 242     (when (org-expiry-expired-p)
 243       (org-back-to-heading)
 244       (looking-at org-complex-heading-regexp)
 245       (let* ((ov (make-overlay (point) (match-end 0)))
 246              (e (org-expiry-expired-p))
 247              (d (time-to-number-of-days e)))
 248         (overlay-put ov 'face 'secondary-selection)
 249         (if (or force
 250                 (null org-expiry-confirm-flag)
 251                 (and (eq org-expiry-confirm-flag 'interactive)
 252                      (not (interactive)))
 253                 (and org-expiry-confirm-flag
 254                      (y-or-n-p (format "Entry expired by %d days.  Process? " d))))
 255           (funcall 'org-expiry-handler-function))
 256         (delete-overlay ov)))))
 257
 258 (defun org-expiry-process-entries (beg end)
 259   "Process all expired entries between BEG and END.
 260 The expiry process will run the function defined by
 261 `org-expiry-handler-functions'."
 262   (interactive "r")
 263   (save-excursion
 264     (let ((beg (if (org-region-active-p)
 265                    (region-beginning) (point-min)))
 266           (end (if (org-region-active-p)
 267                    (region-end) (point-max))))
 268       (goto-char beg)
 269       (let ((expired 0) (processed 0))
 270         (while (and (outline-next-heading) (< (point) end))
 271           (when (org-expiry-expired-p)
 272             (setq expired (1+ expired))
 273             (if (if (org-called-interactively-p)
 274                     (call-interactively 'org-expiry-process-entry)
 275                   (org-expiry-process-entry))
 276                 (setq processed (1+ processed)))))
 277         (if (equal expired 0)
 278             (message "No expired entry")
 279           (message "Processed %d on %d expired entries"
 280                    processed expired))))))
 281
 282 ;;; Insert created/expiry property:
 283
 284 (defun org-expiry-insert-created (&optional arg)
 285   "Insert or update a property with the creation date.
 286 If ARG, always update it.  With one `C-u' prefix, silently update
 287 to today's date.  With two `C-u' prefixes, prompt the user for to
 288 update the date."
 289   (interactive "P")
 290   (let* ((d (org-entry-get (point) org-expiry-created-property-name))
 291          d-time d-hour timestr)
 292     (when (or (null d) arg)
 293       ;; update if no date or non-nil prefix argument
 294       ;; FIXME Use `org-time-string-to-time'
 295       (setq d-time (if d (org-time-string-to-time d)
 296                      (current-time)))
 297       (setq d-hour (format-time-string "%H:%M" d-time))
 298       (setq timestr
 299             ;; two C-u prefixes will call org-read-date
 300             (if (equal arg '(16))
 301                 (concat "<" (org-read-date
 302                              nil nil nil nil d-time d-hour) ">")
 303               (format-time-string (cdr org-time-stamp-formats))))
 304       ;; maybe transform to inactive timestamp
 305       (if org-expiry-inactive-timestamps
 306           (setq timestr (concat "[" (substring timestr 1 -1) "]")))
 307       (save-excursion
 308         (org-entry-put
 309          (point) org-expiry-created-property-name timestr)))))
 310
 311 (defun org-expiry-insert-expiry (&optional today)
 312   "Insert a property with the expiry date.
 313 With one `C-u' prefix, don't prompt interactively for the date
 314 and insert today's date."
 315   (interactive "P")
 316   (let* ((d (org-entry-get (point) org-expiry-expiry-property-name))
 317          d-time d-hour)
 318     (setq d-time (if d (org-time-string-to-time d)
 319                    (current-time)))
 320     (setq d-hour (format-time-string "%H:%M" d-time))
 321     (setq timestr (if today
 322                       (format-time-string (cdr org-time-stamp-formats))
 323                     (concat "<" (org-read-date
 324                                  nil nil nil nil d-time d-hour) ">")))
 325     ;; maybe transform to inactive timestamp
 326     (if org-expiry-inactive-timestamps
 327         (setq timestr (concat "[" (substring timestr 1 -1) "]")))
 328
 329     (save-excursion
 330       (org-entry-put
 331        (point) org-expiry-expiry-property-name timestr))))
 332
 333 ;;; Functions to process expired entries:
 334
 335 (defun org-expiry-archive-subtree ()
 336   "Archive the entry at point if it is expired."
 337   (interactive)
 338   (save-excursion
 339     (if (org-expiry-expired-p)
 340         (org-archive-subtree)
 341       (if (org-called-interactively-p)
 342           (message "Entry at point is not expired.")))))
 343
 344 (defun org-expiry-add-keyword (&optional keyword)
 345   "Add KEYWORD to the entry at point if it is expired."
 346   (interactive "sKeyword: ")
 347   (if (or (member keyword org-todo-keywords-1)
 348           (setq keyword org-expiry-keyword))
 349       (save-excursion
 350         (if (org-expiry-expired-p)
 351             (org-todo keyword)
 352           (if (org-called-interactively-p)
 353               (message "Entry at point is not expired."))))
 354     (error "\"%s\" is not a to-do keyword in this buffer" keyword)))
 355
 356 ;; FIXME what about using org-refile ?
 357
 358 (provide 'org-expiry)
 359
 360 ;;; org-expiry.el ends here