A git pre-commit hook script for formatting the Java source files according to Google Java Style Guide
Place the pre-commit script (with that name and executable bit set) in your .git/hooks directory.
The script will download (and cache) the Jar from https://github.com/google/google-java-format
and try to re-format all changed .java files in the repository. If any re-formatting did occur,
the commit will be aborted, so that you can incorporate formatting fixes.
The script is licensed under Apache License, Version 2.0.