Make pre-commit hook behave more precisely (#95)

* Modify pre-commit to add format changes more appropriately

* Test pre-commit hook change

* Test hook

* Revert "Test hook"

This reverts commit 6a4b041.

* Clarified documentation in pre-commit hook

scripts/pre-commit

@@ -2,12 +2,13 @@
 
 echo "**Performing pre-commit actions**"
 
-echo "**Formatting code with spotless**"
+echo "- Formatting code with spotless"
+# This will format ALL FILES, even unstaged, but that's fine - everything should be formatted when eventually pushed.
 ./gradlew spotlessApply
 
-echo "**Adding changes from reformat**"
-# Add changes for any files already added to the repo - will not support partial repo commits currently
-git add -u
+echo "- Adding any changes from reformat"
+# Add formatting changes to the commit for any files already staged (added)
+git update-index --again
 
 status=$?