[Distel-hackers] who_calls rewrite

[Matthias R. <mat...@so...>]

Hi,

I found distel's "who calls" (C-c C-d w) feature rather cumbersome to
use. It takes ages to start the first time and then doesn't update when
the code changes. Plus the code for it is quite horrible and brittle.

So I replaced all ~250 lines of it with a single call to xref:q/2. See
the attached patch.

Invoking "who calls" for the first time still takes a while, but less
than previously. And code changes are tracked properly.


Regards,

Matthias
PS: xref could also replace some of the other code in distel.erl, such
as the module/function completion support.