Hi Tom,
   Thank you for creating the MultiwayTreeZipper.  I am attempting to wrap 
my head around it.  My understanding of recursion and recursion on trees 
has always been spotty.  I think I understand how to update a datum when a 
Forest/Tree is your elm model.  However, I have been scratching my head the 
past couple days trying to figure out how to display the model?  I am 
attempting to use the MuliwayTreeZipper to display comments & responses so 
I am hoping to have the responses be indented from the comments.  Any ideas 
on how to accomplish that?  Thanks

On Thursday, November 26, 2015 at 10:01:05 AM UTC-5, Tom Kidd wrote:
> I am working on creating a Tree UI Component that would eventually use the 
> Elm Architecture. In doing this work, I uncovered the need to be able to 
> update and navigate tree data structures, and found Huet zippers as a 
> reasonable starting point. I searched the the elm packages and didn't find 
> an implementation, so I created one.
> So far, the implementation is not complete (have not implemented 
> attach/delete), but I believe it is still useful.
> I am looking for feedback because I intend to use this code as a basis for 
> the Tree Component, which I also intend to share when it is ready. This is 
> my first package, so before I submitted it, I wanted to get some feedback. 
> Anyone who is interested in this, please review at the following:
> https://github.com/tomjkidd/elm-multiway-tree-zipper
> *Resources*
> *LYAH Zippers (used for tree updates)*
> http://learnyouahaskell.com/zippers
> *Elm Maybe Monad (needed for possible errors with traversal)*
> https://groups.google.com/forum/#!topic/elm-discuss/hEvS6DgNbwM
> https://github.com/maxsnew/Scramble/blob/master/Scramble/Utils.elm#L12-L27
>  `andThen`, or &> could be used with Zipper a -> Maybe (Zipper a) to 
> compose them together.
> *Huet Zipper*
> https://www.st.cs.uni-saarland.de/edu/seminare/2005/advanced-fp/docs/huet-zipper.pdf
> I still would need to implement the attach and remove functions in order 
> to create a useful library.

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