release.yml

name: Release

on:
  release:
    types: [published]

permissions:
  contents: write

concurrency:
  group: release
  cancel-in-progress: false

jobs:
  stamp:
    name: Stamp the version
    runs-on: ubuntu-latest
    timeout-minutes: 10
    env:
      TAG: ${{ github.event.release.tag_name }}
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main
          fetch-depth: 0

      - name: Read the version from the tag
        id: version
        run: |
          version="${TAG#v}"
          if ! [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+([-+][0-9A-Za-z.-]+)?$ ]]; then
            echo "Release tag '$TAG' is not a semantic version such as v1.2.3" >&2
            exit 1
          fi
          echo "version=$version" >> "$GITHUB_OUTPUT"

      - name: Write the version into the SDK, the README and the changelog
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          sed -i -E "s/static let version = \"[^\"]+\"/static let version = \"$VERSION\"/" Sources/BuzzKit/Networking/HTTPClient.swift
          sed -i -E "s|(buzzkit-dev/buzzkit-ios\", from: \")[^\"]+|\1$VERSION|" README.md
          python3 - <<'EOF'
          import datetime
          import os
          import pathlib

          version = os.environ["VERSION"]
          path = pathlib.Path("CHANGELOG.md")
          text = path.read_text()
          heading = f"## {version} ({datetime.date.today().isoformat()})"
          if f"## {version}" in text:
              pass
          elif "## Unreleased" in text:
              text = text.replace("## Unreleased", f"## Unreleased\n\n{heading}", 1)
          else:
              text = text.replace("# Changelog\n", f"# Changelog\n\n## Unreleased\n\n{heading}\n", 1)
          path.write_text(text)
          EOF
          git diff --stat

      - name: Commit to main and move the tag onto the commit
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          if [ -n "$(git status --porcelain)" ]; then
            git add -A
            git commit -m "chore: release $VERSION"
            git push origin HEAD:main
          fi
          git tag -f "$TAG"
          git push -f origin "refs/tags/$TAG"

      - name: Fill empty release notes from the changelog
        if: github.event.release.body == ''
        env:
          GH_TOKEN: ${{ github.token }}
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          python3 - <<'EOF'
          import os
          import pathlib
          import re

          version = os.environ["VERSION"]
          text = pathlib.Path("CHANGELOG.md").read_text()
          match = re.search(rf"^## {re.escape(version)}[^\n]*\n(.*?)(?=^## |\Z)", text, re.M | re.S)
          pathlib.Path("release-notes.md").write_text(match.group(1).strip() + "\n" if match else "")
          EOF
          if [ -s release-notes.md ]; then
            gh release edit "$TAG" --notes-file release-notes.md
          fi