draft-release.yml

name: Draft release

# Keeps a rolling draft release: every merge to main updates its changelog
# with the PRs merged since the last published release. Publishing the draft
# creates the tag that starts the release. See specs/release-process-spec.md.

on:
  push:
    branches: [main]

permissions:
  contents: write
  pull-requests: read

jobs:
  draft:
    runs-on: ubuntu-latest
    steps:
      - uses: release-drafter/release-drafter@4d75298e00d9e34c483e5ff8c68d0ea1c1940c1e # v7.5.1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6

      # The Releases page must tell the truth before Publish is clicked: when
      # the manifest version is already released, the draft carries a warning
      # banner; once the manifests are bumped, the banner clears and the
      # draft's tag/title default to the guard-passing v<version>.
      - name: Sync the draft with the manifest version
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          VERSION="$(jq -r .version cli/deno.json)"
          DRAFT_ID="$(gh api "repos/${{ github.repository }}/releases?per_page=10" --jq '[.[] | select(.draft)][0].id // empty')"
          if [ -z "$DRAFT_ID" ]; then
            echo "no draft release found"
            exit 0
          fi
          gh api "repos/${{ github.repository }}/releases/$DRAFT_ID" --jq .body > /tmp/body.md
          sed '/<!-- version-banner -->/,/<!-- \/version-banner -->/d' /tmp/body.md > /tmp/clean.md
          if git ls-remote --exit-code origin "refs/tags/v$VERSION" >/dev/null 2>&1; then
            IFS=. read -r MAJ MIN PAT <<< "$VERSION"
            NEXT="$MAJ.$MIN.$(( ${PAT%%[!0-9]*} + 1 ))"
            {
              echo "<!-- version-banner -->"
              echo "> [!WARNING]"
              echo "> The manifests still declare \`$VERSION\`, which is already released."
              echo "> Run \`deno task bump $NEXT\` (or the next minor/major) and merge the"
              echo "> bump before publishing this draft (release spec §2)."
              echo "<!-- /version-banner -->"
              echo
              cat /tmp/clean.md
            } > /tmp/new.md
            gh api -X PATCH "repos/${{ github.repository }}/releases/$DRAFT_ID" \
              -F body=@/tmp/new.md >/dev/null
            echo "draft flagged: manifests still at already-released $VERSION"
          else
            gh api -X PATCH "repos/${{ github.repository }}/releases/$DRAFT_ID" \
              -f tag_name="v$VERSION" -f name="v$VERSION" -F body=@/tmp/clean.md >/dev/null
            echo "draft synced to v$VERSION"
          fi