Pre-commit hook referenced by Reddit post

pre-commit

#!/bin/bash
# .git/hooks/pre-commit
# https://www.reddit.com/r/git/comments/3o1tut/precommit_hook_to_make_sure_you_updated_the/
set -o nounset

REPO_ROOT=$(git rev-parse --show-toplevel)
echo "Git repo is at $REPO_ROOT"

SITE_CHANGES=$(git status -s $REPO_ROOT | wc -l)
echo "Detected $SITE_CHANGES changes"

if [ "$SITE_CHANGES" -gt "0" ]; then
  echo "Checking to make sure package version was updated..."

  VERSION_CHANGED=$(git diff --cached -G '"version":' -- $REPO_ROOT/package.json | wc -l)

  if [ "$VERSION_CHANGED" -gt "0" ]; then
    echo "Version was updated!  Continuing..."
  else
    echo "Version was not updated :( Aborting commit."
    exit 1
  fi
fi