Stack: Use a pretty-printer and polish formatting of output

[mgsloan]

I think it'd be a good idea to start using a pretty printer! ansi-wl-pprint fits the task quite nicely.

Bonus points would be to use annotated-wl-pprint, and use the annotations to do the same thing that ansi-wl-pprint can do with coloring text and such. (I imagine those annotations would also make a good addition to that libary)

I'm imagining having some utility functions that allow you to do $logPretty, $logPrettyError, or $logPrettyWarn. When used, these would have the type (MonadLogger m, HasPrettyOptions env, MonadReader env m) => Doc -> m (). In other words, we need to be able to log the output and have pretty options to pass to the pretty printer. These changes would mostly happen in Stack.Types.StackT.

[luigy]

Wut?! No reactions :disappointed:

I'm pumped for this!

Unless the point got a bit blurred out without screenshots; I feel a bit lonely in haskellandia

[mgsloan]

I imagine that the lack of responses is more representative of there not being more info to add / not wanting to paint the bikeshed. In other words, people may be tacitly excited. Feel free to implement! :D

[mgsloan]

I've implemented this!

Check it out: https://github.com/commercialhaskell/stack/pull/2236