binder-on-pr.yml

# Reference https://mybinder.readthedocs.io/en/latest/howto/gh-actions-badges.html
name: Binder Badge
on:
  pull_request_target:
    types: [opened]

permissions:
  pull-requests: write


jobs:
  binder:
    runs-on: ubuntu-latest
    steps:
      - name: comment on PR with Binder link
        uses: actions/github-script@v3
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            var PR_HEAD_USERREPO = process.env.PR_HEAD_USERREPO;
            var PR_HEAD_REF = process.env.PR_HEAD_REF;
            github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: `[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/${PR_HEAD_USERREPO}/${PR_HEAD_REF}?urlpath=lab) :point_left: Launch a Binder on branch _${PR_HEAD_USERREPO}/${PR_HEAD_REF}_`
            })
        env:
          PR_HEAD_REF: ${{ github.event.pull_request.head.ref }}
          PR_HEAD_USERREPO: ${{ github.event.pull_request.head.repo.full_name }}