From d56a29d2e2e0f036b489ef043de1996834830159 Mon Sep 17 00:00:00 2001
From: Phillip Alday <palday@users.noreply.github.com>
Date: Wed, 15 Jun 2022 16:53:24 +0000
Subject: [PATCH] Create docs-cleanup.yml (#60)

---
 .github/workflows/docs-cleanup.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 .github/workflows/docs-cleanup.yml

diff --git a/.github/workflows/docs-cleanup.yml b/.github/workflows/docs-cleanup.yml
new file mode 100644
index 0000000..e345652
--- /dev/null
+++ b/.github/workflows/docs-cleanup.yml
@@ -0,0 +1,26 @@
+# remove PR previews once they're merged
+# <https://juliadocs.github.io/Documenter.jl/dev/man/hosting/#gh-pages-Branch>
+name: Doc Preview Cleanup
+on:
+  pull_request:
+    types: [closed]
+jobs:
+  doc-preview-cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout gh-pages branch
+        uses: actions/checkout@v2
+        with:
+          ref: gh-pages
+      - name: Delete preview and history + push changes
+        run: |
+            if [ -d "previews/PR$PRNUM" ]; then
+              git config user.name "Documenter.jl"
+              git config user.email "documenter@juliadocs.github.io"
+              git rm -rf "previews/PR$PRNUM"
+              git commit -m "delete preview"
+              git branch gh-pages-new $(echo "delete history" | git commit-tree HEAD^{tree})
+              git push --force origin gh-pages-new:gh-pages
+            fi
+        env:
+            PRNUM: ${{ github.event.number }}