Add bindings to navigates defun in Haskell

[PierreR]

No description provided.

[bmag]

Note: if/when #2747 is merged, then M-h and M-l will provide the same movements.

[syl20bnr]

These are generic functions of Emacs, it feels weird to define them only for Haskell.

[PierreR]

Yep, I have actually asked on the IRC channel which bindings I should use but I haven't received any definitive answer.
It might make sense to make them on SPC-m because AFAIK it is not always implemented by every mode. But sure the binding should be consistent across modes that support the feature.

[d12frosted]

Shouldn't it be closed? :)

[PierreR]

Well so what's the current bindings general or not for this feature ?

[d12frosted]

Yeah, these are really built-in Emacs functions so it's better to map them in every prog mode.

But there's one strange thing. Definition of end-of-defun says that an end of a defun occurs right after the close-parenthesis that matches the open-parenthesis that starts a defun. So it should not even work for haskell-mode. And this is what I experience - instead of navigating between function definitions, it just jumps to beginning or end of module. But it works great for c-like and lisp-like languages.

I wonder if such behaviour is observable only in Emacs 25, hence you sent this PR to add useful key bindings.

[gracjan]

Haskell mode has those functions defined to support Haskell syntax. (right now this is a bit buggy and is disabled by default).

Surely this is generic Emacs functionality and does not have much to do with Haskell specifically.

[TheBB]

Agree with the above discussion, it would be preferable to do this in a more generic way.