From 497532549768def28d7664dc64ded1fd3881c6f6 Mon Sep 17 00:00:00 2001
From: Tom Willemse <tom@ryuslash.org>
Date: Tue, 17 Jul 2018 22:28:07 -0700
Subject: [PATCH] Skip any non-immediate tasks in projects

Focus should always be on the _next_ task in a project.
---
 emacs/.emacs.d/init/oni-org-init.el | 36 +++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/emacs/.emacs.d/init/oni-org-init.el b/emacs/.emacs.d/init/oni-org-init.el
index 0c3fcc5..1ad25ca 100644
--- a/emacs/.emacs.d/init/oni-org-init.el
+++ b/emacs/.emacs.d/init/oni-org-init.el
@@ -38,6 +38,41 @@
     (set-face-attribute 'org-checkbox nil :family "Ionicons")
     (prettify-symbols-mode)))
 
+(defun oni-org-init-heading-has-predecessor-p ()
+  "Determine if the heading at point has any predecessors.
+Only tasks of a level greater than 3 are considered. A task has a
+predecessor if there is a non-DONE sibling defined before it."
+  (let ((point (point)))
+    (save-excursion
+      (org-backward-heading-same-level 1)
+      (seq-let [level _ keyword] (org-heading-components)
+        (not (or (< level 3)
+                 (= point (point))
+                 (member keyword org-done-keywords)))))))
+
+(defun oni-org-init-looking-for-tag-p (tag)
+  "Return t if we're currently looking for TAG in an agenda."
+  (and (eql 'org-tags-view (car org-agenda-redo-command))
+       (string-match-p (rx-to-string `(and word-start ,tag word-end))
+                       org-agenda-query-string)))
+
+(defun oni-org-init-next-heading-position ()
+  "Get the position of the next Org heading."
+  (or (ignore-errors
+        (org-forward-element)
+        (point))
+      (point-max)))
+
+(defun oni-org-init-skip-tasks ()
+  "Skip over tasks I don't want to see right now.
+Tasks being skipped over include ones with the \"ex\" tag and
+ones that have a predecessor."
+  (let ((tags (org-get-tags-at (point))))
+    (when (or (and (not (oni-org-init-looking-for-tag-p "ex"))
+                   (member "ex" tags))
+              (oni-org-init-heading-has-predecessor-p))
+      (oni-org-init-next-heading-position))))
+
 (setq org-default-notes-file "~/documents/gtd/inbox.org")
 (setq org-src-fontify-natively t)
 (setq org-return-follows-link t)
@@ -47,6 +82,7 @@
 (setq org-use-fast-todo-selection t)
 (setq org-log-into-drawer t)
 (setq org-agenda-todo-ignore-scheduled 'future)
+(setq org-agenda-skip-function-global #'oni-org-init-skip-tasks)
 
 (setq org-agenda-files
       '("~/documents/gtd/todo.org"