AfterCast 

AfterCast - Perform action after a cast
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This is a fairly simple addon for performing actions based on the success or failure of a cast. Usage is as follows

/aftercast /smile
/aftercast +fail /cry
/cast Frostbolt(Rank 2)

If the spell succeeds then you'll smile, if it fails, then you'll
cry. If it is interrupted then nothing will happen.

Events you can use are:

+done At the end of successful casting (Default if no event given)
+fail If the spell fails
+interrupt If the spell is interrupted
+start When spell starts casting (Fires before done for instant spells)

Aftercasts apply to the next spell which occurs, and then is reset, you can set up one of each event before each cast.

These functions can also be gotten at via lua functions

AfterCast(doneAction, failAction);
Shortcut to set up the 2 most common actions, either can be nil.

AfterCastOn(event, action)
Set up a specific action (use without the +, so "done", "fail", etc)

AfterCastReason([clearFlag])
Return the stop reason ("done"/"interrupt"/"fail") for the last cast (nil if none have stopped since the last clear).. if clearFlag is present and true then resets status after return.