[Haskell-cafe] Re: How do you rewrite your code?

[Johannes Waldmann]

Not exactly answering your question, but here's the top refactorings
that I'd like to see in a Haskell IDE:

* rename identifier (aware of scopes, modules, qualified imports etc.)
* move definition from one module to another (aware of ...)

* change "type" to "newtype" or "data"
* change positional to named record notation

* introduce parameter (to function) 
  (with a default value that is plugged in at each call site)
* change order of parameters
* introduce parameter object

That's the kind of basic rewriting that is really really awkward to do
with a plain text editor (because you really need the annotated AST,
with names resolved, and types attached) - so it's usually avoided (well, by me)
and the result is code that is a nightmare to maintain.