name: "Detect new java files"

on:
  pull_request:
    branches: [ master, stable-* ]

permissions: read-all

jobs:
  detectNewJavaFiles:
    runs-on: ubuntu-latest
    steps:
      -   id: file_changes
          uses: trilom/file-changes-action@v1.2.4
          with:
            output: ','
      -   name: Detect new java files
          run: |
            if [ -z '${{ steps.file_changes.outputs.files_added }}' ]; then
                echo "No new files added"
                exit 0
            fi
            new_java=$(echo '${{ steps.file_changes.outputs.files_added }}' | tr ',' '\n' | grep '\.java$' | cat)
            if [ -n "$new_java" ]; then
                # shellcheck disable=SC2016
                printf 'New java files detected:\n```\n%s\n```\n' "$new_java" | tee "$GITHUB_STEP_SUMMARY"
                exit 1
            else
                echo "No new java files detected"
                exit 0
            fi