set-milestone-from-base-branch.yml

name: Set PR Milestone

on:
  pull_request:
    types: [closed]
    branches: [master, 1.*]

concurrency: set-bb-issues-milestone

jobs:
  set-pr-milestone:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest-2-cores
    steps:
      - env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO_NAME: ${{ github.event.repository.full_name }}
          PR_NUMBER: ${{ github.event.number }}
        name: "Set milestone on PR based on base branch"
        run: |
          readarray -t milestones < <(gh api /repos/brave/brave-core/milestones -q ".[] | .title")
          if [[ "$GITHUB_BASE_REF" = "master" ]]; then
              milestone_selector="Nightly"
          else
              milestone_selector="$GITHUB_BASE_REF"
          fi

          milestone=$(printf "%s\n" "${milestones[@]}" | grep -F "$milestone_selector")
          gh pr edit "$PR_NUMBER" -R "$REPO_NAME" -m "$milestone"

  set-brave-browser-issues-milestone:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest-2-cores
    needs: set-pr-milestone
    steps:
      - env:
          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
          REPO_NAME: ${{ github.event.repository.full_name }}
          PR_NUMBER: ${{ github.event.number }}
        name: "Set milestone on related issues in brave-browser"
        run: |
          BB_ISSUE_PREFIX="https://github.com/brave/brave-browser/issues/"
          BB_ISSUE_URL_REGEX='(http(s)?:\/\/)?github.com/brave/brave-browser/issues/\d+'
          UPLIFT_PR_REGEX='uplift\s+(?:of)?:?\s+\K(#\d+)'
          RESOLVE_ISSUE_REGEX="(?:resolv|fix|clos)(?:e|es|ed)?:?\s+<?\K(${BB_ISSUE_URL_REGEX})"
          verlte() { printf '%s\n%s' "$1" "$2" | sort -C -V; }
          normalize_issue_links() { sed "s@\sbrave\/brave-browser\#\([0-9]\+\)@ ${BB_ISSUE_PREFIX}\1@g"; }

          pr_body=$(gh pr view "${PR_NUMBER}" -R "${REPO_NAME}" --json body --jq .body | normalize_issue_links)

          readarray -t issues_pr < <(echo "${pr_body}" | grep -ioP "${RESOLVE_ISSUE_REGEX}" || :)
          echo "Looking for any uplifted PRs"
          readarray -t prs < <(echo "${pr_body}" | grep -ioP "${UPLIFT_PR_REGEX}" || :)
          readarray -t issues_uplift_pr < <(echo "${prs[@]}" | xargs -n 1 -I{} gh pr view {} -R brave/brave-core --json body --jq ".body" | normalize_issue_links | grep -ioP "${RESOLVE_ISSUE_REGEX}")
          readarray -t issues < <(printf "%s\n" "${issues_pr[@]}" "${issues_uplift_pr[@]}"| sort -u | sed '/^\s*$/d')
          echo "Relevant issues detected:"
          printf "%s\n" "${issues[@]}"

          pr_milestone=$(gh pr view "${PR_NUMBER}" -R "${REPO_NAME}" --json milestone --jq .milestone.title)

          for issue in "${issues[@]}"; do
              issue_milestone=$(gh issue view "${issue}" --json milestone --jq .milestone.title)
              if [[ -z "${issue_milestone}" ]] || verlte "${pr_milestone}" "${issue_milestone}"; then
                  echo "Setting ${issue} milestone to ${pr_milestone}"
                  gh issue edit "${issue}" -m "${pr_milestone}"
              fi
          done