git pre-push hook for Scala test passing

pre-push-hook-install.sh

#!/bin/sh
cd "$(dirname "$0")"
touch .git/hooks/pre-push
rm .git/hooks/pre-push
ln -s ../../pre-push-hook.sh .git/hooks/pre-push

pre-push-hook.sh

# checks if locally staged changes pass tests.
echo "starting pre-push hook"

_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
DIR=$( echo $_DIR | sed 's/\/.git\/hooks$//' )

echo "Running pre-commit hook ... (you can omit this with --no-verify, but don't)"
git diff --quiet
hadNoNonStagedChanges=$?

if ! [ $hadNoNonStagedChanges -eq 0 ]
then
	echo "* Stashing non-staged changes"
	git stash --keep-index -u > /dev/null
fi


[ ! -f $DIR/build.sbt ]
sbtProject=$?

if [ ! sbtProject -eq 0 ]
then
    echo "* Not an SBT Project."
    exit 0
fi

echo "* This is an SBT project."
echo "* Running Tests."
sbt ";clean;test" > /dev/null
passes=$?

echo "* Compiles?"

if [ $passes -eq 0 ]
then
	echo "* Yes!"
else
	echo "* No!"
fi

if ! [ $hadNoNonStagedChanges -eq 0 ]
then
	echo "* Scheduling stash pop of previously stashed non-staged changes for 1 second after commit"
	sleep 1 && git stash pop --index > /dev/null & # sleep and & otherwise commit fails when this leads to a merge conflict
fi

if [ $passes -eq 0 ] 
then
	echo "... done. Proceeding with commit."
	exit 0
else
	echo "CANCELLING commit due to COMPILE or TEST ERROR."
	exit 2
fi