run_pr_on_binder.yml

name: Interactive PRs
on:
  pull_request:
    types: [labeled, synchronize]


jobs:
  setup-interactive-pr:
    name: Setup interactive PR
    runs-on: ubuntu-latest

    steps:
      - name: Check if this is a labelling event, and the 'interactive_review' label was added
        if: ${{ github.event.action == 'labeled' && github.event.label.name == 'interactive_review' }}
        id: checkLabelFromLabelling
        shell: bash
        run: echo "::set-output name=hasLabel::true"

      - name: Check if this is a synchronise event and the 'interactive_review' label is present
        uses: Dreamcodeio/pr-has-label-action@master
        if: ${{ github.event.action != 'labeled' }}
        id: checkLabelFromSync
        with:
          label: interactive_review

      - name: Combine variables into a single output
        if: ${{ steps.checkLabelFromLabelling.outputs.hasLabel || steps.checkLabelFromSync.outputs.hasLabel }}
        shell: bash
        id: checkLabel
        run: echo "::set-output name=hasLabel::true"

      - name: Calculate build finish time
        id: buildFinish
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        shell: bash
        run: echo ::set-output name=finish_time::`TZ='Europe/London' date --date 'now + 5 minutes' +%H:%M`
      
      - name: Find comment (in case one already exists)
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        uses: peter-evans/find-comment@v1
        id: findComment
        with:
          issue-number: ${{github.event.number}}
          body-includes: <!-- GH Actions Binder Comment -->

      - name: Create comment (if it doesn't exist)
        id: createComment
        if: ${{ steps.checkLabel.outputs.hasLabel && (steps.findComment.outputs.comment-id == 0) }}
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{github.event.number}}
          body: |
            <!-- GH Actions Binder Comment -->
            Building interactive demo on Binder, due to complete at ${{ steps.buildFinish.outputs.finish_time }} UK time.

      - name: Update comment (if it already exists)
        if: ${{ steps.checkLabel.outputs.hasLabel && (steps.findComment.outputs.comment-id != 0) }}
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{github.event.number}}
          comment-id: ${{ steps.findComment.outputs.comment-id }}
          edit-mode: replace
          body: |
            <!-- GH Actions Binder Comment -->
            Building interactive demo on Binder, due to complete at ${{ steps.buildFinish.outputs.finish_time }} UK time.      

      - name: Trigger builds on Binder
        uses: s-weigand/trigger-mybinder-build@v1
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        with:
          target-repo: debrief/pepys-import
          target-state: ${{ github.head_ref }}

      - name: Wait for 5 minutes (to give time for all Binder instances to build)
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        uses: jakejarvis/wait-action@master
        with:
          time: '5m'

      # We can't just use the earlier output from findComment as we may have created a new comment
      - name: Find comment from earlier
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        uses: peter-evans/find-comment@v1
        id: findComment2
        with:
          issue-number: ${{github.event.number}}
          body-includes: <!-- GH Actions Binder Comment -->

      - name: Update comment with link
        if: ${{ steps.checkLabel.outputs.hasLabel }}
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{github.event.number}}
          comment-id: ${{ steps.findComment2.outputs.comment-id }}
          edit-mode: replace
          body: |
            <!-- GH Actions Binder Comment -->
            :rocket: Interactive demo available via Binder [![logo](https://mybinder.org/static/logo.svg)](https://mybinder.org/v2/gh/debrief/pepys-import/${{github.head_ref}}?filepath=demos/).

            *Note:* The Jupyter notebook browser will open in the `demos` folder. See comments above for which notebook to use,
            otherwise use the `_Default_Demo.ipynb` notebook.