GitHub Actions: template cleanup workflow

Author: hsz

.github/template-cleanup/README.md

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+# %NAME%
+
+![Tests](https://github.com/%REPOSITORY%/workflows/Tests/badge.svg)
+
+---
+Repository based on the [Advent of Code Kotlin Template][template].
+
+[template]: https://github.com/hsz/advent-of-code-kotlin-template

.github/template-cleanup/gradle.properties

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+version = 2021.0
+group = %GROUP%
+gradleVersion = 7.3

.github/template-cleanup/settings.gradle.kts

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+rootProject.name = "%NAME%"

.github/workflows/template-cleanup.yml

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+# GitHub Actions Workflow responsible for cleaning up the Advent of Code Kotlin 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: Template Cleanup
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+
+  # Run cleaning process only if workflow is triggered by the .../advent-of-code-kotlin-template repository.
+  template-cleanup:
+    name: Template Cleanup
+    runs-on: ubuntu-latest
+    if: github.event.repository.name != 'advent-of-code-kotlin-template'
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/[email protected]
+
+      # Cleanup project
+      - name: Cleanup
+        run: |
+          export LC_CTYPE=C
+          export LANG=C
+
+          # Prepare variables
+          NAME="${GITHUB_REPOSITORY##*/}"
+          ACTOR=$(echo $GITHUB_ACTOR | tr '[:upper:]' '[:lower:]')
+          SAFE_NAME=$(echo $NAME | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          SAFE_ACTOR=$(echo $ACTOR | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          GROUP="com.github.$SAFE_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 $GROUP
+          find src -type f -exec sed -i "s/com.github.hsz.aoc/$GROUP/g" {} +
+          find src -type f -exec sed -i "s/Template/$NAME/g" {} +
+          find src -type f -exec sed -i "s/JetBrains/$ACTOR/g" {} +
+
+          # Move content
+          mkdir -p src/main/kotlin/${GROUP//.//}
+          mkdir -p src/test/kotlin/${GROUP//.//}
+          cp -R .github/template-cleanup/* .
+          cp -R src/main/kotlin/com/github/hsz/aoc/* src/main/kotlin/${GROUP//.//}/
+          cp -R src/test/kotlin/com/github/hsz/aoc/* src/test/kotlin/${GROUP//.//}/
+
+          # Cleanup
+          rm -rf \
+            .github/readme \
+            .github/template-cleanup \
+            .github/workflows/template-cleanup.yml \
+            CODE_OF_CONDUCT.md \
+            LICENSE
+          
+          find . -type d -empty -delete
+
+      # Commit modified files
+      - name: Commit files
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add .
+          git commit -m "Template cleanup"
+
+      # Push changes
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          branch: main
+          github_token: ${{ secrets.GITHUB_TOKEN }}

settings.gradle.kts

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+rootProject.name = "Advent of Code Kotlin Template"