diffusers/.github/workflows/pr_labeler.yml

name: PR Labeler

on:
  pull_request_target:
    types: [opened, synchronize, reopened]


permissions: {}

jobs:
  label:
    permissions:
      contents: read
      issues: read
      pull-requests: write
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      PR_NUMBER: ${{ github.event.pull_request.number }}
      REPO: ${{ github.repository }}
    steps:
      # label
      - uses: actions/labeler@bf12e9b00b37c5c0ca2b87b79b2daf7891dbda13  # v7.0.0
        with:
          sync-labels: true

      # missing-tests
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
        id: checkout
        if: ${{ !cancelled() }}
        with:
          ref: ${{ github.event.pull_request.base.sha }}
      - name: Check for missing tests
        id: check
        if: ${{ !cancelled() && steps.checkout.outcome == 'success' }}
        run: |
          gh api --paginate "repos/${REPO}/pulls/${PR_NUMBER}/files" \
            | python utils/check_test_missing.py
      - name: Add or remove missing-tests label
        if: always()
        run: |
          HAS_LABEL=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq 'any(.[]; .name == "missing-tests")')
          if [ "${{ steps.check.outcome }}" = "failure" ]; then
            if [ "$HAS_LABEL" != "true" ]; then
              gh pr edit "$PR_NUMBER" --add-label "missing-tests"
            fi
          else
            if [ "$HAS_LABEL" = "true" ]; then
              gh pr edit "$PR_NUMBER" --remove-label "missing-tests" 2>/dev/null || true
            fi
          fi

      # fixes-issue
      - name: Check for linked closing issues
        # An issue the PR author opened after the PR does not count as linked.
        if: ${{ !cancelled() }}
        run: |
          OWNER="${REPO%/*}"
          NAME="${REPO#*/}"
          COUNT=$(gh api graphql \
            -F owner="$OWNER" -F name="$NAME" -F number="$PR_NUMBER" \
            -f query='
              query($owner: String!, $name: String!, $number: Int!) {
                repository(owner: $owner, name: $name) {
                  pullRequest(number: $number) {
                    createdAt
                    author { login }
                    closingIssuesReferences(first: 50) {
                      nodes { createdAt author { login } }
                    }
                  }
                }
              }' \
            --jq '.data.repository.pullRequest as $pr
                  | [$pr.closingIssuesReferences.nodes[]
                     | select(.author.login != $pr.author.login or .createdAt < $pr.createdAt)]
                  | length')
          HAS_LABEL=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq 'any(.[]; .name == "fixes-issue")')
          if [ "${COUNT:-0}" -gt 0 ]; then
            if [ "$HAS_LABEL" != "true" ]; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "fixes-issue"
            fi
          else
            if [ "$HAS_LABEL" = "true" ]; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "fixes-issue" 2>/dev/null || true
            fi
          fi

      # size-label
      - name: Label PR by diff size
        if: ${{ !cancelled() }}
        run: |
          DIFF_SIZE=$(gh api "repos/${REPO}/pulls/${PR_NUMBER}" --jq '.additions + .deletions')
          if [ "$DIFF_SIZE" -lt 50 ]; then
            CANDIDATE_LABEL="size/S"
          elif [ "$DIFF_SIZE" -lt 200 ]; then
            CANDIDATE_LABEL="size/M"
          else
            CANDIDATE_LABEL="size/L"
          fi
          CURRENT_LABELS=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq '.[].name')
          for label in size/S size/M size/L; do
            if [ "$label" != "$CANDIDATE_LABEL" ] && echo "$CURRENT_LABELS" | grep -qx "$label"; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "$label" 2>/dev/null || true
            fi
          done
          if ! echo "$CURRENT_LABELS" | grep -qx "$CANDIDATE_LABEL"; then
            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "$CANDIDATE_LABEL"
          fi