changeset.yml

name: Changeset

on:
  pull_request:
    types: [labeled]
    branches: [main, 'release/**']

jobs:
  changeset:
    # A fork PR gets a read-only token, so the push would 403. Skip cleanly instead of
    # failing. fork contributors are covered by the changeset status check.
    if: >
      startsWith(github.event.label.name, 'changeset:') &&
      github.event.pull_request.head.repo.full_name == github.repository
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Write the changeset
        env:
          LABEL: ${{ github.event.label.name }}
          TITLE: ${{ github.event.pull_request.title }}
          BRANCH: ${{ github.event.pull_request.head.ref }}
          NUMBER: ${{ github.event.pull_request.number }}
        run: |
          bump="${LABEL#changeset:}"
          slug=$(printf '%s' "$BRANCH" \
            | tr '[:upper:]' '[:lower:]' \
            | sed -e 's#[^a-z0-9]#-#g' -e 's#--*#-#g' -e 's#^-##' -e 's#-$##')

          mkdir -p .changeset
          printf -- '---\n"@opencollection/docs": %s\n---\n\n%s (#%s)\n' \
            "$bump" "$TITLE" "$NUMBER" > ".changeset/${slug}.md"

          cat ".changeset/${slug}.md"

      - name: Commit it to the PR branch
        env:
          ACTOR: ${{ github.actor }}
          ACTOR_ID: ${{ github.actor_id }}
        run: |
          git config user.name  "$ACTOR"
          git config user.email "${ACTOR_ID}+${ACTOR}@users.noreply.github.com"
          git add .changeset
          if git diff --cached --quiet; then
            echo "changeset unchanged, nothing to commit"
            exit 0
          fi
          git commit -m "chore: add changeset"
          git push