name: Refs not closing
description: >-
  Refuse a pull request whose `Refs #N` promise contradicts GitHub's
  closing-issue graph (#218). GitHub recognizes closing keywords anywhere
  in a PR body, including ordinary prose and code spans; the action reads
  the graph once and lets a pure script decide whether any Refs target is
  already scheduled to close.
runs:
  using: composite
  steps:
    - name: refs targets are not closing
      shell: bash
      env:
        GH_TOKEN: ${{ github.token }}
        PR_NUMBER: ${{ github.event.pull_request.number }}
      run: |
        set -euo pipefail

        owner="${GITHUB_REPOSITORY%%/*}"
        name="${GITHUB_REPOSITORY#*/}"
        [ -n "$PR_NUMBER" ] || {
          echo "refs-not-closing: pull request number is unavailable" >&2
          exit 1
        }

        facts="$(gh api graphql \
          -f query='query($owner: String!, $name: String!, $number: Int!) {
            repository(owner: $owner, name: $name) {
              pullRequest(number: $number) {
                body
                closingIssuesReferences(first: 100) {
                  nodes { number }
                  pageInfo { hasNextPage }
                }
              }
            }
          }' \
          -F owner="$owner" -F name="$name" -F number="$PR_NUMBER")"

        body_file="$(mktemp)"
        closing_file="$(mktemp)"
        trap 'rm -f "$body_file" "$closing_file"' EXIT
        jq -er '
          .data.repository.pullRequest
          | if . == null then error("pull request was not returned") else .body // "" end
        ' <<<"$facts" >"$body_file"
        jq -r '
          .data.repository.pullRequest.closingIssuesReferences
          | if . == null then
              error("closing issue references were not returned")
            elif .pageInfo.hasNextPage then
              error("more than 100 closing issue references; refusing a partial verdict")
            else
              .nodes[].number
            end
        ' <<<"$facts" >"$closing_file"

        mapfile -t closing_issues <"$closing_file"
        bash "$GITHUB_ACTION_PATH/refs-not-closing.sh" \
          "$body_file" "${closing_issues[@]}"