Is there an index of common playbook directives?

[Brad Smith]

I'm looking for something like the module index pages, but with coverage of the shared directives that can be included in any play, e.g. name, sudo/become, when, register (bonus points for something that details all the properties of the object that register returns), etc. I see these scattered about in their respective sections of the docs, but sometimes the descriptions there don't seem exhaustive, and who knows what directives I've missed? Is there another reference I should be looking at that has it all in one place?

Thanks!

--Brad

[Sergey Anuchin]

This summary(http://www-uxsup.csx.cam.ac.uk/~jw35/docs/ansible/ansible-summary.html) is very useful despite being a little bit outdated. 

[Brian Coca]

on my 'wishlist' is getting all this 'autodocumented', much like modules do right now.

​before 2.0 this was really hard for plays/tasks, but in 2.0 it should not be hard to at least 'list' the directives available by instantiating the classes and ​looping over the attributes.

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Brian Coca