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Reference: https://gist.github.com/andris9/1978266#gistcomment-3930475
https://stackoverflow.com/questions/45416049/how-to-make-a-git-pre-commit-hook-that-checks-the-commit-message (after commit and .gitmeta is done, get commit msg)
https://www.w3docs.com/snippets/git/how-to-retrieve-hash-for-commits-in-git.html (get commit hash, too. Then commit in .git/meta)