Git pre-commit hook to precompile assets if anything changed in app/assets or vendor/assets

pre-commit

#!/bin/bash

# source rvm and .rvmrc if present
[ -s "$HOME/.rvm/scripts/rvm" ] && . "$HOME/.rvm/scripts/rvm"
[ -s "$PWD/.rvmrc" ] && . "$PWD/.rvmrc"
 
should_precompile=0

# check if anything changed in app/assets
if git diff-index --name-only HEAD | egrep '^app/assets' >/dev/null ; then
  should_precompile=1
fi

# check if anything changed in app/assets
if git diff-index --name-only HEAD | egrep '^vendor/assets' >/dev/null ; then
  should_precompile=1
fi

# precompile assets if any have been updated
if [ $should_precompile -eq 1 ]; then
  echo 'Precompiling assets...'
  rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
  git add public/assets/*
fi