GitHub Actions - template cleanup workflow

.github/workflows/template-cleanup.yml

@@ -0,0 +1,67 @@
+# GitHub Actions Workflow responsible for cleaning up the IntelliJ Plugin Template repository from
+# the template-specific files and configurations. This workflow is supposed to be triggered automatically
+# when a new template-based repository has been created.
+
+name: Tempalte Cleanup
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+
+  # Run cleaning process only if workflow is triggered by the non-JetBrains/intellij-plugin-template repository.
+  template-cleanup:
+    name: Template Cleanup
+    runs-on: ubuntu-latest
+    if: github.repository != 'JetBrains/intellij-plugin-template'
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v2
+
+      # Cleanup project
+      - name: Cleanup
+        run: |
+          export LC_CTYPE=C
+          export LANG=C
+
+          # Prepare variables
+          NAME="${GITHUB_REPOSITORY##*/}"
+          SAFE_NAME=$(echo $NAME | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          ACTOR=$(echo $GITHUB_ACTOR | tr '[:upper:]' '[:lower:]')
+          GROUP="com.github.$ACTOR.$SAFE_NAME"
+
+          # Replace placeholders in the template-cleanup files
+          sed -i '' "s/%NAME%/$NAME/g" .github/template-cleanup/*
+          sed -i '' "s/%REPOSITORY%/${GITHUB_REPOSITORY/\//\\/}/g" .github/template-cleanup/*
+          sed -i '' "s/%GROUP%/$GROUP/g" .github/template-cleanup/*
+
+          # Replace template package name in project files with $GROUP
+          sed -i '' "s/org.jetbrains.plugins.template/$GROUP/g" gradle.properties
+          find . -type f -exec sed -i '' "s/org.jetbrains.plugins.template/$GROUP/g" {} +
+
+          # Move content
+          mkdir -p src/main/kotlin/${GROUP//.//}
+          cp -R .github/template-cleanup/* .
+          cp -R src/main/kotlin/org/jetbrains/plugins/template/* src/main/kotlin/${GROUP//.//}/
+
+          # Cleanup
+          rm -rf .github/readme
+          rm -rf .github/template-cleanup
+          rm -rf src/main/kotlin/org
+          rm .github/workflows/template-cleanup.yml
+
+      # Commit modified files
+      - name: Commit files
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git commit -m "Template cleanup" -a
+
+      # Push changes
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}