post-checkout

#!/bin/sh

echo "post-checkout hook will be executed"

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

# rollback migrations if present
OLDBRANCH=$1
NEWBRANCH=$2
ISBRANCHCHANGE=$3

if [ ISBRANCHCHANGE ]; then
	AORD=$(git diff --name-status $OLDBRANCH $NEWBRANCH | egrep 'db/migrate' | egrep -m 1 -o '^[A-Z]')
	if [ "$AORD" = "A" ]; then
		echo 'Migrating database...'
		bundle exec rake db:migrate
	else
		MIGRATIONS=$(git diff --name-only $OLDBRANCH $NEWBRANCH | egrep '^db/migrate'| wc -l)
		REVERTFILECOUNT=$(($MIGRATIONS + 1))
		FILE=$(git ls-tree -r --name-status $OLDBRANCH db/migrate | tail -$REVERTFILECOUNT | head -1 | cut -d'_' -f 1 | cut -d/ -f3)
		if [ $MIGRATIONS -ne 0 ]; then
		  echo 'Rolling back migrations...'
		  echo "bundle exec rake db:migrate VERSION="$FILE
		  git checkout $OLDBRANCH db/migrate/
		  bundle exec rake db:migrate VERSION=$FILE
		  git reset db/migrate/
		  git clean -f db/migrate -q
		fi
	fi
fi