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+;;; org-inlinetask.el --- Tasks Independent of Outline Hierarchy -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2009-2017 Free Software Foundation, Inc.
+;;
+;; Author: Carsten Dominik <carsten at orgmode dot org>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: http://orgmode.org
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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:
+;;
+;; This module implements inline tasks in Org mode.  Inline tasks are
+;; tasks that have all the properties of normal outline nodes,
+;; including the ability to store meta data like scheduling dates,
+;; TODO state, tags and properties.  However, these nodes are treated
+;; specially by the visibility cycling.
+;;
+;; Visibility cycling exempts these nodes from cycling.  So whenever
+;; their parent is opened, so are these tasks.  This will only work
+;; with `org-cycle', so if you are also using other commands to
+;; show/hide entries, you will occasionally find these tasks to behave
+;; like all other outline nodes, seemingly splitting the text of the
+;; parent into children.
+;;
+;; Special fontification of inline tasks, so that they can be
+;; immediately recognized.  From the stars of the headline, only the
+;; first and the last two will be visible, the others will be hidden
+;; using the `org-hide' face.
+;;
+;; An inline task is identified solely by a minimum outline level,
+;; given by the variable `org-inlinetask-min-level', default 15.
+;;
+;; If you need to have a time planning line (DEADLINE etc), drawers,
+;; for example LOGBOOK of PROPERTIES, or even normal text as part of
+;; the inline task, you must add an "END" headline with the same
+;; number of stars.
+;;
+;; As an example, here are two valid inline tasks:
+;;
+;;    **************** TODO a small task
+;;
+;; and
+;;
+;;    **************** TODO another small task
+;;                     DEADLINE: <2009-03-30 Mon>
+;;                     :PROPERTIES:
+;;                       :SOMETHING: or other
+;;                     :END:
+;;                     And here is some extra text
+;;    **************** END
+;;
+;; Also, if you want to use refiling and archiving for inline tasks,
+;; The END line must be present to make things work properly.
+;;
+;; Note that you should not try to use inline tasks within plain list,
+;; visibility cycling is known to be problematic when doing so.
+;;
+;; This package installs one new command:
+;;
+;; C-c C-x t      Insert a new inline task with END line
+
+;;; Code:
+
+(require 'org)
+
+(defgroup org-inlinetask nil
+  "Options concerning inline tasks in Org mode."
+  :tag "Org Inline Tasks"
+  :group 'org-structure)
+
+(defcustom org-inlinetask-min-level 15
+  "Minimum level a headline must have before it is treated as an inline task.
+Don't set it to something higher than `29' or clocking will break since this
+is the hardcoded maximum number of stars `org-clock-sum' will work with.
+
+It is strongly recommended that you set `org-cycle-max-level' not at all,
+or to a number smaller than this one.  In fact, when `org-cycle-max-level' is
+not set, it will be assumed to be one less than the value of smaller than
+the value of this variable."
+  :group 'org-inlinetask
+  :type '(choice
+	  (const :tag "Off" nil)
+	  (integer)))
+
+(defcustom org-inlinetask-show-first-star nil
+  "Non-nil means display the first star of an inline task as additional marker.
+When nil, the first star is not shown."
+  :tag "Org Inline Tasks"
+  :group 'org-structure
+  :type 'boolean)
+
+(defvar org-odd-levels-only)
+(defvar org-keyword-time-regexp)
+(defvar org-complex-heading-regexp)
+(defvar org-property-end-re)
+
+(defcustom org-inlinetask-default-state nil
+  "Non-nil means make inline tasks have a TODO keyword initially.
+This should be the state `org-inlinetask-insert-task' should use by
+default, or nil if no state should be assigned."
+  :group 'org-inlinetask
+  :version "24.1"
+  :type '(choice
+	  (const :tag "No state" nil)
+	  (string :tag "Specific state")))
+
+(defun org-inlinetask-insert-task (&optional no-state)
+  "Insert an inline task.
+If prefix arg NO-STATE is set, ignore `org-inlinetask-default-state'."
+  (interactive "P")
+  ;; Error when inside an inline task, except if point was at its very
+  ;; beginning, in which case the new inline task will be inserted
+  ;; before this one.
+  (when (and (org-inlinetask-in-task-p)
+	     (not (and (org-inlinetask-at-task-p) (bolp))))
+    (error "Cannot nest inline tasks"))
+  (or (bolp) (newline))
+  (let* ((indent (if org-odd-levels-only
+		     (1- (* 2 org-inlinetask-min-level))
+		   org-inlinetask-min-level))
+	 (indent-string (concat (make-string indent ?*) " ")))
+    (insert indent-string
+	    (if (or no-state (not org-inlinetask-default-state))
+		"\n"
+	      (concat org-inlinetask-default-state " \n"))
+	    indent-string "END\n"))
+  (end-of-line -1))
+(define-key org-mode-map "\C-c\C-xt" 'org-inlinetask-insert-task)
+
+(defun org-inlinetask-outline-regexp ()
+  "Return string matching an inline task heading.
+The number of levels is controlled by `org-inlinetask-min-level'."
+  (let ((nstars (if org-odd-levels-only
+		    (1- (* org-inlinetask-min-level 2))
+		  org-inlinetask-min-level)))
+    (format "^\\(\\*\\{%d,\\}\\)[ \t]+" nstars)))
+
+(defun org-inlinetask-at-task-p ()
+  "Return true if point is at beginning of an inline task."
+  (save-excursion
+    (beginning-of-line)
+    (and (looking-at (concat (org-inlinetask-outline-regexp)  "\\(.*\\)"))
+	 (not (string-match "^end[ \t]*$" (downcase (match-string 2)))))))
+
+(defun org-inlinetask-in-task-p ()
+  "Return true if point is inside an inline task."
+  (save-excursion
+    (beginning-of-line)
+    (let* ((case-fold-search t)
+	   (stars-re (org-inlinetask-outline-regexp))
+	   (task-beg-re (concat stars-re "\\(?:.*\\)"))
+	   (task-end-re (concat stars-re "END[ \t]*$")))
+      (or (looking-at-p task-beg-re)
+	  (and (re-search-forward "^\\*+[ \t]+" nil t)
+	       (progn (beginning-of-line) (looking-at-p task-end-re)))))))
+
+(defun org-inlinetask-goto-beginning ()
+  "Go to the beginning of the inline task at point."
+  (end-of-line)
+  (let ((case-fold-search t)
+	(inlinetask-re (org-inlinetask-outline-regexp)))
+    (re-search-backward inlinetask-re nil t)
+    (when (looking-at-p (concat inlinetask-re "END[ \t]*$"))
+      (re-search-backward inlinetask-re nil t))))
+
+(defun org-inlinetask-goto-end ()
+  "Go to the end of the inline task at point.
+Return point."
+  (save-match-data
+    (beginning-of-line)
+    (let* ((case-fold-search t)
+	   (inlinetask-re (org-inlinetask-outline-regexp))
+	   (task-end-re (concat inlinetask-re "END[ \t]*$")))
+      (cond
+       ((looking-at task-end-re))
+       ((looking-at inlinetask-re)
+	(forward-line)
+	(cond
+	 ((looking-at task-end-re))
+	 ((looking-at inlinetask-re))
+	 ((org-inlinetask-in-task-p)
+	  (re-search-forward inlinetask-re nil t))))
+       (t (re-search-forward inlinetask-re nil t)))
+      (end-of-line)
+      (point))))
+
+(defun org-inlinetask-get-task-level ()
+  "Get the level of the inline task around.
+This assumes the point is inside an inline task."
+  (save-excursion
+    (end-of-line)
+    (re-search-backward (org-inlinetask-outline-regexp) nil t)
+    (- (match-end 1) (match-beginning 1))))
+
+(defun org-inlinetask-promote ()
+  "Promote the inline task at point.
+If the task has an end part, promote it.  Also, prevents level from
+going below `org-inlinetask-min-level'."
+  (interactive)
+  (if (not (org-inlinetask-in-task-p))
+      (error "Not in an inline task")
+    (save-excursion
+      (let* ((lvl (org-inlinetask-get-task-level))
+	     (next-lvl (org-get-valid-level lvl -1))
+	     (diff (- next-lvl lvl))
+	     (down-task (concat (make-string next-lvl ?*)))
+	     beg)
+	(if (< next-lvl org-inlinetask-min-level)
+	    (error "Cannot promote an inline task at minimum level")
+	  (org-inlinetask-goto-beginning)
+	  (setq beg (point))
+	  (replace-match down-task nil t nil 1)
+	  (org-inlinetask-goto-end)
+	  (if (eobp) (beginning-of-line) (forward-line -1))
+	  (unless (= (point) beg)
+	    (replace-match down-task nil t nil 1)
+	    (when org-adapt-indentation
+	      (goto-char beg)
+	      (org-fixup-indentation diff))))))))
+
+(defun org-inlinetask-demote ()
+  "Demote the inline task at point.
+If the task has an end part, also demote it."
+  (interactive)
+  (if (not (org-inlinetask-in-task-p))
+      (error "Not in an inline task")
+    (save-excursion
+      (let* ((lvl (org-inlinetask-get-task-level))
+	     (next-lvl (org-get-valid-level lvl 1))
+	     (diff (- next-lvl lvl))
+	     (down-task (concat (make-string next-lvl ?*)))
+	     beg)
+	(org-inlinetask-goto-beginning)
+	(setq beg (point))
+	(replace-match down-task nil t nil 1)
+	(org-inlinetask-goto-end)
+	(if (eobp) (beginning-of-line) (forward-line -1))
+	(unless (= (point) beg)
+	  (replace-match down-task nil t nil 1)
+	  (when org-adapt-indentation
+	    (goto-char beg)
+	    (org-fixup-indentation diff)))))))
+
+(defun org-inlinetask-get-current-indentation ()
+  "Get the indentation of the last non-while line above this one."
+  (save-excursion
+    (beginning-of-line 1)
+    (skip-chars-backward " \t\n")
+    (beginning-of-line 1)
+    (or (org-at-item-p)
+	(looking-at "[ \t]*"))
+    (goto-char (match-end 0))
+    (current-column)))
+
+(defvar org-indent-indentation-per-level) ; defined in org-indent.el
+
+(defface org-inlinetask '((t :inherit shadow))
+  "Face for inlinetask headlines."
+  :group 'org-faces)
+
+(defun org-inlinetask-fontify (limit)
+  "Fontify the inline tasks down to LIMIT."
+  (let* ((nstars (if org-odd-levels-only
+		     (1- (* 2 (or org-inlinetask-min-level 200)))
+		   (or org-inlinetask-min-level 200)))
+	 (re (concat "^\\(\\*\\)\\(\\*\\{"
+		     (format "%d" (- nstars 3))
+		     ",\\}\\)\\(\\*\\* .*\\)"))
+	 ;; Virtual indentation will add the warning face on the first
+	 ;; star.  Thus, in that case, only hide it.
+	 (start-face (if (and (bound-and-true-p org-indent-mode)
+			      (> org-indent-indentation-per-level 1))
+			 'org-hide
+		       'org-warning)))
+    (while (re-search-forward re limit t)
+      (if org-inlinetask-show-first-star
+	  (add-text-properties (match-beginning 1) (match-end 1)
+			       `(face ,start-face font-lock-fontified t)))
+      (add-text-properties (match-beginning
+			    (if org-inlinetask-show-first-star 2 1))
+			   (match-end 2)
+			   '(face org-hide font-lock-fontified t))
+      (add-text-properties (match-beginning 3) (match-end 3)
+			   '(face org-inlinetask font-lock-fontified t)))))
+
+(defun org-inlinetask-toggle-visibility ()
+  "Toggle visibility of inline task at point."
+  (let ((end (save-excursion
+	       (org-inlinetask-goto-end)
+	       (if (bolp) (1- (point)) (point))))
+	(start (save-excursion
+		 (org-inlinetask-goto-beginning)
+		 (point-at-eol))))
+    (cond
+     ;; Nothing to show/hide.
+     ((= end start))
+     ;; Inlinetask was folded: expand it.
+     ((eq (get-char-property (1+ start) 'invisible) 'outline)
+      (outline-flag-region start end nil)
+      (org-cycle-hide-drawers 'children))
+     (t (outline-flag-region start end t)))))
+
+(defun org-inlinetask-hide-tasks (state)
+  "Hide inline tasks in buffer when STATE is `contents' or `children'.
+This function is meant to be used in `org-cycle-hook'."
+  (pcase state
+    (`contents
+     (let ((regexp (org-inlinetask-outline-regexp)))
+       (save-excursion
+	 (goto-char (point-min))
+	 (while (re-search-forward regexp nil t)
+	   (org-inlinetask-toggle-visibility)
+	   (org-inlinetask-goto-end)))))
+    (`children
+     (save-excursion
+       (while (and (outline-next-heading) (org-inlinetask-at-task-p))
+	 (org-inlinetask-toggle-visibility)
+	 (org-inlinetask-goto-end))))))
+
+(defun org-inlinetask-remove-END-maybe ()
+  "Remove an END line when present."
+  (when (looking-at (format "\\([ \t]*\n\\)*\\*\\{%d,\\}[ \t]+END[ \t]*$"
+			    org-inlinetask-min-level))
+    (replace-match "")))
+
+(add-hook 'org-font-lock-hook 'org-inlinetask-fontify)
+(add-hook 'org-cycle-hook 'org-inlinetask-hide-tasks)
+
+(provide 'org-inlinetask)
+
+;;; org-inlinetask.el ends here