From 489a9d812b2e0444cba08f9d7beb7863d21a48d0 Mon Sep 17 00:00:00 2001
From: Ian Hunt-Isaak <ianhuntisaak@gmail.com>
Date: Thu, 4 Mar 2021 16:08:58 -0500
Subject: [PATCH] add action to comment on PRs with a binder link

---
 .github/workflows/binder-on-pr.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 .github/workflows/binder-on-pr.yml

diff --git a/.github/workflows/binder-on-pr.yml b/.github/workflows/binder-on-pr.yml
new file mode 100644
index 0000000000..07d19164ab
--- /dev/null
+++ b/.github/workflows/binder-on-pr.yml
@@ -0,0 +1,26 @@
+# Reference https://mybinder.readthedocs.io/en/latest/howto/gh-actions-badges.html
+name: Binder Badge
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  binder:
+    runs-on: ubuntu-latest
+    steps:
+    - name: comment on PR with Binder link
+      uses: actions/github-script@v1
+      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}/${PR_HEAD_REF}?urlpath=lab/tree/docs/source/examples/) :point_left: Launch a binder notebook on branch _${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 }}