name: Create Release

on:
  push:
    branches:
      - main

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: get release info
        id: release_info
        run: |
          version="$(awk '/^## / { print tolower($2) }' CHANGELOG.md | head -1)"
          changelog="$(sed -e "1,/^## ${version}/d" -e "/^## /,\$d" CHANGELOG.md)"
          changelog="${changelog//'%'/'%25'}"
          changelog="${changelog//$'\n'/'%0A'}"
          changelog="${changelog//$'\r'/'%0D'}"
          echo "::set-output name=version::$version"
          echo "::set-output name=changelog::$changelog"

      - name: create release
        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.release_info.outputs.version != 'unreleased'
        uses: actions/create-release@v1
        id: create_release
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ steps.release_info.outputs.version }}
          release_name: Release ${{ steps.release_info.outputs.version }}
          body: ${{ steps.release_info.outputs.changelog }}