Now it doesn't print things the user doesn't care about, like empty
lint passes, or broken linters that aren't relevant to the current
project.
Added a test pass to ensure it doesn't blow up when running against
an empty stage.
import future there too.
If the current working directory is the base directory, the filter
was broken. Damn the outside world (∑) for being complicated.
Elf M. Sternberg