name: change

on:
  push:
    branches:
      - 'main'

jobs:
  changelog:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Generate
        run: |
          tags=$(git tag --sort=creatordate)
          previous=""
          if [ ! -f CHANGELOG.md ]; then
            echo "" > CHANGELOG.md
          else
            previous=$(grep -oP '^## \K.*' CHANGELOG.md | tail -n 1)
          fi
          for tag in $tags; do
            if [ -n "$previous" ]; then
              echo "## $tag" >> CHANGELOG.md
              git log --pretty=format:"* %s (%h)" "$previous..$tag" >> CHANGELOG.md
              echo -e "\n" >> CHANGELOG.md
            fi
            previous=$tag
          done

      - name: Commit
        run: |
          if ！git diff --cached --quiet; then
            git config --local user.email "action@github.com"
            git config --local user.name "GitHub Action"
            git add CHANGELOG.md
            git commit -m "Update Changelog"
            git push
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}