Detect the root of Subversion checkouts.

[Wilfred]

Related to #285, it would be nice if projectile could automatically detect the root of subversion repositories. This code provides that.

I've added a dependency on the excellent f.el, since I think it makes the code much more readable. Happy to refactor if you don't want the dependency.

Let me know if you want me to make any improvements :)

[bbatsov]

The code looks good, but I don't think we need f.el. Most of the functions you've used in your are trivial wrappers around the "native" API and the predicate methods in f.el use the pretty unemacsy suffix ? (blame it on @magnars and his love for Clojure (which I share) I guess :-) ). Personally I prefer it over the canonical -p, but I value consistency above all else. s.el at least has aliased versions of predicate methods. No idea why @rejeep decided to disregard the common convention (although there's f-unibyte-string-p).

[Wilfred]

Searching through the functions defined in my current Emacs instance, you're right about ?. The only packages using ? for predicates (that I have installed) are dash.el, s.el, f.el and ht.el. It makes sense to have -p aliases. I've never liked the convention of foop without the dash though.

Anyway, I've pushed a commit that removes the f.el dependency. It's not quite as robust (f.el does the right thing with path expansion and relative paths) but sufficient for projectile's needs. I think the code reads slightly more nicely with f.el, but now you can choose which you like best :).

[bbatsov]

Thanks for the update. Just add a changelog entry and squash the two commits together.

[Wilfred]

Squashed and pushed.

[bbatsov]

Thanks!

[thomasf]

maybe locate-dominating-stop-dir-regexp should be consulted too for consistency with top-down traversals.