5ec5063dc7
This uses the logic in `brew.sh` for deciding whether or not to run `brew update --auto-update` and makes it a dedicated command that can be used instead of `brew update` in scripts to be really fast in the no-op case. `brew update` will always do at least some updating which is a nicer default but is much slower.
Library
This directory contains all the code run by the official brew command in Homebrew and all formulae (package descriptions) in taps (repositories containing formulae) in Taps subdirectories.