Hope I can motivated someone to work on adding a function to Phobos that returns the available disk space (on a given path): https://issues.dlang.org/show_bug.cgi?id=16487

(I needed this for file cache management in LDC, and was surprised I had to write my own.)

I think it'd be a valuable addition, especially because it is non-trivial to make cross-platform and hard to test whether it actually works.

Much obliged,
  Johan