Add pre-commit hook for spotlessApply

Author: rubensworks

build.gradle

@@ -322,3 +322,9 @@ spotless {
         removeUnusedImports()
     }
 }
+
+tasks.register('updateGitHooks', Copy) {
+    from './scripts/pre-commit'
+    into './.git/hooks'
+}
+compileJava.dependsOn updateGitHooks

scripts/pre-commit

@@ -0,0 +1,11 @@
+#!/bin/sh
+stagedFiles=$(git diff --staged --name-only)
+
+echo "Formatting code..."
+./gradlew spotlessApply
+
+for file in $stagedFiles; do
+  if test -f "$file"; then
+    git add $file
+  fi
+done