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Daniel Weschke
2022-01-04 21:35:17 +01:00
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;;; org-depend.el --- TODO dependencies for Org-mode
;; Copyright (C) 2008-2021 Free Software Foundation, Inc.
;;
;; Author: Carsten Dominik <carsten.dominik@gmail.com>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: https://orgmode.org
;; Version: 0.08
;;
;; This file is not part of GNU Emacs.
;;
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;; WARNING: This file is just a PROOF OF CONCEPT, not a supported part
;; of Org-mode.
;;
;; This is an example implementation of TODO dependencies in Org-mode.
;; It uses the new hooks in version 5.13 of Org-mode,
;; `org-trigger-hook' and `org-blocker-hook'.
;;
;; It implements the following:
;;
;; Triggering
;; ----------
;;
;; 1) If an entry contains a TRIGGER property that contains the string
;; "chain-siblings(KEYWORD)", then switching that entry to DONE does
;; do the following:
;; - The sibling following this entry switched to todo-state KEYWORD.
;; - The sibling also gets a TRIGGER property "chain-sibling(KEYWORD)",
;; property, to make sure that, when *it* is DONE, the chain will
;; continue.
;;
;; 2) If an entry contains a TRIGGER property that contains the string
;; "chain-siblings-scheduled", then switching that entry to DONE does
;; the following actions, similarly to "chain-siblings(KEYWORD)":
;; - The sibling receives the same scheduled time as the entry
;; marked as DONE (or, in the case, in which there is no scheduled
;; time, the sibling does not get any either).
;; - The sibling also gets the same TRIGGER property
;; "chain-siblings-scheduled", so the chain can continue.
;;
;; 3) If the TRIGGER property contains the string
;; "chain-find-next(KEYWORD[,OPTIONS])", then switching that entry
;; to DONE do the following:
;; - All siblings are of the entry are collected into a temporary
;; list and then filtered and sorted according to OPTIONS
;; - The first sibling on the list is changed into KEYWORD state
;; - The sibling also gets the same TRIGGER property
;; "chain-find-next", so the chain can continue.
;;
;; OPTIONS should be a comma separated string without spaces, and
;; can contain following options:
;;
;; - from-top the candidate list is all of the siblings in
;; the current subtree
;;
;; - from-bottom candidate list are all siblings from bottom up
;;
;; - from-current candidate list are all siblings from current item
;; until end of subtree, then wrapped around from
;; first sibling
;;
;; - no-wrap candidate list are siblings from current one down
;;
;; - todo-only Only consider siblings that have a todo keyword
;; -
;; - todo-and-done-only
;; Same as above but also include done items.
;;
;; - priority-up sort by highest priority
;; - priority-down sort by lowest priority
;; - effort-up sort by highest effort
;; - effort-down sort by lowest effort
;;
;; Default OPTIONS are from-top
;;
;;
;; 4) If the TRIGGER property contains any other words like
;; XYZ(KEYWORD), these are treated as entry id's with keywords. That
;; means Org-mode will search for an entry with the ID property XYZ
;; and switch that entry to KEYWORD as well.
;;
;; Blocking
;; --------
;;
;; 1) If an entry contains a BLOCKER property that contains the word
;; "previous-sibling", the sibling above the current entry is
;; checked when you try to mark it DONE. If it is still in a TODO
;; state, the current state change is blocked.
;;
;; 2) If the BLOCKER property contains any other words, these are
;; treated as entry id's. That means Org-mode will search for an
;; entry with the ID property exactly equal to this word. If any
;; of these entries is not yet marked DONE, the current state change
;; will be blocked.
;;
;; 3) Whenever a state change is blocked, an org-mark is pushed, so that
;; you can find the offending entry with `C-c &'.
;;
;;; Example:
;;
;; When trying this example, make sure that the settings for TODO keywords
;; have been activated, i.e. include the following line and press C-c C-c
;; on the line before working with the example:
;;
;; #+TYP_TODO: TODO NEXT | DONE
;;
;; * TODO Win a million in Las Vegas
;; The "third" TODO (see above) cannot become a TODO without this money.
;;
;; :PROPERTIES:
;; :ID: I-cannot-do-it-without-money
;; :END:
;;
;; * Do this by doing a chain of TODO's
;; ** NEXT This is the first in this chain
;; :PROPERTIES:
;; :TRIGGER: chain-siblings(NEXT)
;; :END:
;;
;; ** This is the second in this chain
;;
;; ** This is the third in this chain
;; :PROPERTIES:
;; :BLOCKER: I-cannot-do-it-without-money
;; :END:
;;
;; ** This is the forth in this chain
;; When this is DONE, we will also trigger entry XYZ-is-my-id
;; :PROPERTIES:
;; :TRIGGER: XYZ-is-my-id(TODO)
;; :END:
;;
;; ** This is the fifth in this chain
;;
;; * Start writing report
;; :PROPERTIES:
;; :ID: XYZ-is-my-id
;; :END:
;;
;;
(require 'org)
(eval-when-compile
(require 'cl))
(defcustom org-depend-tag-blocked t
"Whether to indicate blocked TODO items by a special tag."
:group 'org
:type 'boolean)
(defcustom org-depend-find-next-options
"from-current,todo-only,priority-up"
"Default options for chain-find-next trigger"
:group 'org
:type 'string)
(defmacro org-depend-act-on-sibling (trigger-val &rest rest)
"Perform a set of actions on the next sibling, if it exists,
copying the sibling spec TRIGGER-VAL to the next sibling."
`(catch 'exit
(save-excursion
(goto-char pos)
;; find the sibling, exit if no more siblings
(condition-case nil
(outline-forward-same-level 1)
(error (throw 'exit t)))
;; mark the sibling TODO
,@rest
;; make sure the sibling will continue the chain
(org-entry-add-to-multivalued-property
nil "TRIGGER" ,trigger-val))))
(defvar org-depend-doing-chain-find-next nil)
(defun org-depend-trigger-todo (change-plist)
"Trigger new TODO entries after the current is switched to DONE.
This does two different kinds of triggers:
- If the current entry contains a TRIGGER property that contains
\"chain-siblings(KEYWORD)\", it goes to the next sibling, marks it
KEYWORD and also installs the \"chain-sibling\" trigger to continue
the chain.
- If the current entry contains a TRIGGER property that contains
\"chain-siblings-scheduled\", we go to the next sibling and copy
the scheduled time from the current task, also installing the property
in the sibling.
- Any other word (space-separated) like XYZ(KEYWORD) in the TRIGGER
property is seen as an entry id. Org-mode finds the entry with the
corresponding ID property and switches it to the state TODO as well."
;; Refresh the effort text properties
(org-refresh-properties org-effort-property 'org-effort)
;; Get information from the plist
(let* ((type (plist-get change-plist :type))
(pos (plist-get change-plist :position))
(from (plist-get change-plist :from))
(to (plist-get change-plist :to))
(org-log-done nil) ; IMPORTANT!: no logging during automatic trigger!
trigger triggers tr p1 p2 kwd id)
(catch 'return
(unless (eq type 'todo-state-change)
;; We are only handling todo-state-change....
(throw 'return t))
(unless (and (member from org-not-done-keywords)
(member to org-done-keywords))
;; This is not a change from TODO to DONE, ignore it
(throw 'return t))
;; OK, we just switched from a TODO state to a DONE state
;; Lets see if this entry has a TRIGGER property.
;; If yes, split it up on whitespace.
(setq trigger (org-entry-get pos "TRIGGER")
triggers (and trigger (split-string trigger)))
;; Go through all the triggers
(while (setq tr (pop triggers))
(cond
((and (not org-depend-doing-chain-find-next)
(string-match "\\`chain-find-next(\\b\\(.+?\\)\\b\\(.*\\))\\'" tr))
;; smarter sibling selection
(let* ((org-depend-doing-chain-find-next t)
(kwd (match-string 1 tr))
(options (match-string 2 tr))
(options (if (or (null options)
(equal options ""))
org-depend-find-next-options
options))
(todo-only (string-match "todo-only" options))
(todo-and-done-only (string-match "todo-and-done-only"
options))
(from-top (string-match "from-top" options))
(from-bottom (string-match "from-bottom" options))
(from-current (string-match "from-current" options))
(no-wrap (string-match "no-wrap" options))
(priority-up (string-match "priority-up" options))
(priority-down (string-match "priority-down" options))
(effort-up (string-match "effort-up" options))
(effort-down (string-match "effort-down" options)))
(save-excursion
(org-back-to-heading t)
(let ((this-item (point)))
;; go up to the parent headline, then advance to next child
(org-up-heading-safe)
(let ((end (save-excursion (org-end-of-subtree t)
(point)))
(done nil)
(items '()))
(outline-next-heading)
(while (not done)
(if (not (looking-at org-complex-heading-regexp))
(setq done t)
(let ((todo-kwd (match-string 2))
(tags (match-string 5))
(priority (org-get-priority (or (match-string 3) "")))
(effort (when (or effort-up effort-down)
(let ((effort (get-text-property (point) 'org-effort)))
(when effort
(org-duration-to-minutes effort))))))
(push (list (point) todo-kwd priority tags effort)
items))
(unless (org-goto-sibling)
(setq done t))))
;; massage the list according to options
(setq items
(cond (from-top (nreverse items))
(from-bottom items)
((or from-current no-wrap)
(let* ((items (nreverse items))
(pos (position this-item items :key #'first))
(items-before (subseq items 0 pos))
(items-after (subseq items pos)))
(if no-wrap items-after
(append items-after items-before))))
(t (nreverse items))))
(setq items (remove-if
(lambda (item)
(or (equal (first item) this-item)
(and (not todo-and-done-only)
(member (second item) org-done-keywords))
(and (or todo-only
todo-and-done-only)
(null (second item)))))
items))
(setq items
(sort
items
(lambda (item1 item2)
(let* ((p1 (third item1))
(p2 (third item2))
(e1 (fifth item1))
(e2 (fifth item2))
(p1-lt (< p1 p2))
(p1-gt (> p1 p2))
(e1-lt (and e1 (or (not e2) (< e1 e2))))
(e2-gt (and e2 (or (not e1) (> e1 e2)))))
(cond (priority-up
(or p1-gt
(and (equal p1 p2)
(or (and effort-up e1-lt)
(and effort-down e2-gt)))))
(priority-down
(or p1-lt
(and (equal p1 p2)
(or (and effort-up e1-lt)
(and effort-down e2-gt)))))
(effort-up
(or e2-gt (and (equal e1 e2) p1-gt)))
(effort-down
(or e1-lt (and (equal e1 e2) p1-gt))))))))
(when items
(goto-char (first (first items)))
(org-entry-add-to-multivalued-property nil "TRIGGER" tr)
(org-todo kwd)))))))
((string-match "\\`chain-siblings(\\(.*?\\))\\'" tr)
;; This is a TODO chain of siblings
(setq kwd (match-string 1 tr))
(org-depend-act-on-sibling (format "chain-siblings(%s)" kwd)
(org-todo kwd)))
((string-match "\\`\\(\\S-+\\)(\\(.*?\\))\\'" tr)
;; This seems to be ENTRY_ID(KEYWORD)
(setq id (match-string 1 tr)
kwd (match-string 2 tr)
p1 (org-find-entry-with-id id))
;; First check current buffer, then all files.
(if p1
;; There is an entry with this ID, mark it TODO.
(save-excursion
(goto-char p1)
(org-todo kwd))
(when (setq p2 (org-id-find id))
(save-excursion
(with-current-buffer (find-file-noselect (car p2))
(goto-char (cdr p2))
(org-todo kwd))))))
((string-match "\\`chain-siblings-scheduled\\'" tr)
(let ((time (org-get-scheduled-time pos)))
(when time
(org-depend-act-on-sibling
"chain-siblings-scheduled"
(org-schedule nil time))))))))))
(defun org-depend-block-todo (change-plist)
"Block turning an entry into a TODO.
This checks for a BLOCKER property in an entry and checks
all the entries listed there. If any of them is not done,
block changing the current entry into a TODO entry. If the property contains
the word \"previous-sibling\", the sibling above the current entry is checked.
Any other words are treated as entry id's. If an entry exists with the
this ID property, that entry is also checked."
;; Get information from the plist
(let* ((type (plist-get change-plist :type))
(pos (plist-get change-plist :position))
(from (plist-get change-plist :from))
(to (plist-get change-plist :to))
(org-log-done nil) ; IMPORTANT!: no logging during automatic trigger
blocker blockers bl p1 p2
(proceed-p
(catch 'return
;; If this is not a todo state change, or if this entry is
;; DONE, do not block
(when (or (not (eq type 'todo-state-change))
(member from (cons 'done org-done-keywords))
(member to (cons 'todo org-not-done-keywords))
(not to))
(throw 'return t))
;; OK, the plan is to switch from nothing to TODO
;; Lets see if we will allow it. Find the BLOCKER property
;; and split it on whitespace.
(setq blocker (org-entry-get pos "BLOCKER")
blockers (and blocker (split-string blocker)))
;; go through all the blockers
(while (setq bl (pop blockers))
(cond
((equal bl "previous-sibling")
;; the sibling is required to be DONE.
(catch 'ignore
(save-excursion
(goto-char pos)
;; find the older sibling, exit if no more siblings
(unless (org-get-last-sibling)
(throw 'ignore t))
;; Check if this entry is not yet done and block
(unless (org-entry-is-done-p)
;; return nil, to indicate that we block the change!
(org-mark-ring-push)
(throw 'return nil)))))
((setq p1 (org-find-entry-with-id bl))
;; there is an entry with this ID, check it out
(save-excursion
(goto-char p1)
(unless (org-entry-is-done-p)
;; return nil, to indicate that we block the change!
(org-mark-ring-push)
(throw 'return nil))))
((setq p2 (org-id-find bl))
(save-excursion
(with-current-buffer (find-file-noselect (car p2))
(goto-char (cdr p2))
(unless (org-entry-is-done-p)
(org-mark-ring-push)
(throw 'return nil)))))))
;; Return t to indicate that we are not blocking.
t)))
(when org-depend-tag-blocked
(org-toggle-tag "blocked" (if proceed-p 'off 'on)))
proceed-p))
(add-hook 'org-trigger-hook 'org-depend-trigger-todo)
(add-hook 'org-blocker-hook 'org-depend-block-todo)
(provide 'org-depend)
;;; org-depend.el ends here