For now, we assume that each subproject has an sbt configuration. The build script will run each subproject that has some changes.
The draft implementation of the script
#!/bin/bash
COUNT=0
#list subdirectories
for d in */ ; do
#check for sbt subproject
if [ -f "$d/build.sbt" ]
then
#check for changes
if git diff --name-only HEAD^ | grep "$d" > /dev/null
then
DIFF[COUNT]="$d"
COUNT=$((COUNT+1))
fi
fi
done
#run test for all subprojects with changes
for i in ${DIFF[@]}; do
echo "Run sbt"
cd "$i"
sbt test
cd ../
done