propagate-labels.yml

name: Propagate labels
on:
  pull_request:
    types: [closed]

env:
  GH_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
  LABELS: "feature/web3/wallet feature/web3/wallet/core"

jobs:
  propagate:
    if: github.event.pull_request.merged == true
    name: propagate labels
    runs-on: ubuntu-latest
    steps:
      - name: propagate labels
        run: |
          set -xeEo pipefail
          shopt -s inherit_errexit

          pr_number="${{ github.event.pull_request.number }}"
          read -ra relevant_pr_labels <<<"$(gh pr view -R "$GITHUB_REPOSITORY" "$pr_number" --json labels -q ".labels[].name"|\
            grep -E "${LABELS// /|}"|tr '\n' '\t')"

          if [[ "${relevant_pr_labels[*]}" ]]; then
            read -ra pr_issues <<<"$(gh api graphql -q ".data.repository.pullRequest.closingIssuesReferences.edges[].node.url" -f query="{
              repository(owner: \"${GITHUB_REPOSITORY_OWNER:?}\", name: \"${GITHUB_REPOSITORY##*/}\") {
                pullRequest(number: ${pr_number:?}) { closingIssuesReferences (first: 100) { edges { node { url } } } }
              } }"|tr '\n' '\t')"

            for label in "${relevant_pr_labels[@]}"; do
              for issue in "${pr_issues[@]}"; do
                if [[ "$(gh label list -R "$(echo "${issue:?}"|cut -d/ -f4-5)" -S "${label:?}" \
                    --json name -q ".[]|select(.name==\"$label\").name")" ]]; then
                  gh issue edit "$issue" --add-label "$label"
                fi
              done
            done
          fi