sanger/limber

# Create or update merge-to-master pull requests for production releases
# Note that by design, creating or editing a PR will not trigger a downstream `pull_request` event as this could lead to recursion
name: Release
on:
  push:
    branches:
      - develop
jobs:
  pull_request:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Create or update PR
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_TITLE="[automated] Merge Develop into Master"

          # Extract numbers from PRs that have been merged into develop
          PR_NUMBERS=$(gh api repos/:owner/:repo/compare/master...develop --jq '
          .commits[]
          | select(.commit.message
          | startswith("Merge pull request"))
          | .commit.message
          | capture("#(?<pr_number>\\d+)")
          | .pr_number'
          )

          # Fetch titles for each PR number
          PR_NUMBERS_AND_TITLES=$(for PR_NUMBER in $PR_NUMBERS; do
            gh pr view $PR_NUMBER --json number,title --jq '{number: .number, title: .title}'
          done | jq -s 'sort_by(.title)')

          # Sort extracted PR numbers by title
          SORTED_PR_NUMBERS=$(jq -r '.[].number' <<< "$PR_NUMBERS_AND_TITLES")

          STORIES=$(xargs -I {} gh pr view {} --json body --jq '.body | if . | test("Closes #\\d+") then capture("Closes #(?<issue_number>\\d+)") | "- #{}
            - Closes #" + .issue_number else "- #{}" end' <<< "$SORTED_PR_NUMBERS") # Note the line-break on this line is for formatting

          PR_BODY="#### Changes proposed in this pull request

          $(echo "$STORIES")

          #### Instructions for Reviewers

          - _Check stories are ready for release._
          - _Check for any database migrations._
          - _Check for debug code._
          - _Check version is appropriate._

          This description will be overwritten on the next push
          This PR was auto-generated on $(TZ=Europe/London date --iso-8601=seconds)"

          # Check if a PR already exists
          EXISTING_PR=$(gh pr list --base master --head develop --json number --jq '.[0].number')

          if [ -z "$EXISTING_PR" ]; then
            gh pr create --base master --head develop --title "$PR_TITLE" --body "$PR_BODY" --draft
          else
            gh pr edit "$EXISTING_PR" --body "$PR_BODY"
          fi