draft-release-notes-on-tag2.yaml

name: Draft release notes on tag
on:
  push

jobs:
  draft_release_notes2:
    name: Draft release notes
    #if: github.event.ref_type == 'tag' && github.event.master_branch == 'master'
    runs-on: ubuntu-latest
    steps:
      - name: Get milestone title
        id: milestoneTitle
        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # 6.4.1
        with:
          result-encoding: string
          script: |
            // Get the milestone title ("X.Y.Z") from tag name ("vX.Y.Z")
            //const milestoneTitle = '${{github.event.ref}}'.startsWith('v') ?
            //    '${{github.event.ref}}'.substring(1) :
            //    '${{github.event.ref}}'
            const milestoneTitle = '1.16.0'
                    
            // Look for the milestone
            const milestone = (await github.paginate('GET /repos/{owner}/{repo}/milestones', {
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'all'
            })).find(m => m.title == milestoneTitle)
            if (!milestone) {
              core.setFailed('Failed to find milestone: ${milestoneTitle}')
              return
            }

            // Get pull requests of the milestone
            const pullRequests = (await github.paginate('/repos/{owner}/{repo}/issues', {
              owner: context.repo.owner,
              repo: context.repo.repo,
              milestone: milestone.number,
              state: 'closed'
            }))
            .filter(i => i.pull_request && i.pull_request.merged_at)                     // Skip closed but not merged
            .filter(p => !p.labels.find(label => label.name == 'tag: no release notes')) // Skip excluded

            console.log(pullRequests)


            var prByComponents = new Map()
            var prByInstrumentations = new Map()
            for (let pullRequest of pullRequests) {
              for (let label of pullRequest.labels) {
                const index = label.name.indexOf(':')
                if (index == -1) {
                  core.notice('Unsupported label: ${label.name}')
                  continue
                }
                const labelKey = label.name.substring(0, index)
                const labelValue = label.name.slice(index + 1)
                var map = null
                if (labelKey == 'comp') {
                  map = prByComponents
                } else if (labelKey == 'inst') {
                  map = prByInstrumentations
                }
                if (map) {
                  var prs = map.get(label.description)
                  if (!prs) {
                    prs = new Array()
                    map.set(label.description, prs)
                  }
                  prs.push(pullRequest)
                }
              }
            }
            
            console.log("components: ")
            console.log(prByComponents)
            console.log("instrumentations: ")
            console.log(prByInstrumentations)