RFC: Extensible Dependencies 'N' Actions

[Ian Dunn <dunni@gnu.org>]

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I've been working on something akin to org-depend.el called org-edna.
Basically, Edna provides an extensible means of specifying blocking
conditions and trigger actions.

For example, Edna allows you to specify that a task should be blocked
until all TODOs have been addressed in source code:


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* TODO Address all TODOs in code
  :PROPERTIES:
  :BLOCKER: file("main.cpp") file("code.cpp") re-search("TODO")
  :END:
* TODO Commit Code to Repository

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Or schedule the following task for an hour after the current task is
completed:


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* TODO Put clothes in washer
  SCHEDULED: <2017-04-08 Sat 09:00>
  :PROPERTIES:
  :TRIGGER: next-sibling scheduled("++1h")
  :END:
* TODO Put clothes in dryer
  :PROPERTIES:
  :TRIGGER: next-sibling scheduled("++1h")
  :BLOCKER:  previous-sibling
  :END:

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The (semi-complete) documentation is here:
http://www.nongnu.org/org-edna-el/

I'd appreciate some feedback on it, whether the code or the
documentation.

-- 
Ian Dunn