Support non- /usr/local/ paths for Homebrew prefix

[JamesMcMahon]

I use a custom path for my Homebrew prefix. When installing kr through the tap I needed to go in and manually clean up my .ssh/config and replace /usr/local/ with my custom prefix.

Would it be possible to support this out of the box?

[kcking]

Have you exported the HOMEBREW_PREFIX environment variable? kr reads this during kr pair and uses it instead of /usr/local if it is set (the exact logic is here: https://github.com/kryptco/kr/blob/2f43a8bb0ce036420580320558e7ff9f8b065bc1/kr/kr_darwin.go#L17)

[JamesMcMahon]

No, now that I look at it I didn't have HOMEBREW_PREFIX set. I may have missed but looking through the docs I don't see that ever called out as something that to be set to apply a non-standard prefix. My concern would be that no one else would have this set since it's really not called out by Homebrew.

Just spit balling here, but is it possible to resolve brew --prefix to determine the prefix?