1 files changed, 72 insertions, 0 deletions
diff --git a/.github/workflows/playwright_comment.yml b/.github/workflows/playwright_comment.yml
new file mode 100644
index 00000000..8c33b618
--- /dev/null
+++ b/.github/workflows/playwright_comment.yml
@@ -0,0 +1,72 @@
+name: Comment on the PR with Playwright results
+
+on:
+  workflow_run:
+    workflows: ["Playwright Tests"]
+    types:
+      - completed
+permissions: {}
+jobs:
+  playwright_comment:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: Grab playwright-output from PR run
+        uses: dawidd6/action-download-artifact@5e780fc7bbd0cac69fc73271ed86edf5dcb72d67 # pin@v2
+        continue-on-error: true
+        id: playwright-output
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+          name: playwright-output
+
+      - name: Grab master-screenshots-outcome from PR run
+        uses: dawidd6/action-download-artifact@5e780fc7bbd0cac69fc73271ed86edf5dcb72d67 # pin@v2
+        continue-on-error: true
+        id: master-screenshots-outcome
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+          name: master-screenshots-outcome
+
+      - name: Load artifacts into environment variables
+        id: playwright
+        run: |
+          EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
+          echo "PLAYWRIGHT_OUTPUT<<$EOF" >> $GITHUB_OUTPUT
+          cat ./playwright-output >> $GITHUB_OUTPUT
+          echo "$EOF" >> $GITHUB_OUTPUT
+          echo "NUM_FAILED=$(grep -c 'Screenshot comparison failed' $GITHUB_OUTPUT)" >> $GITHUB_OUTPUT
+
+      - name: "[Comment] Couldn't download screenshots from master branch"
+        uses: mshick/add-pr-comment@a65df5f64fc741e91c59b8359a4bc56e57aaf5b1 # pin@v2
+        if: github.event_name == 'pull_request' && steps.master-screenshots-outcome == 'failure'
+        with:
+          message: |
+            :heavy_exclamation_mark: Could not fetch screenshots from master branch, so had nothing to make a visual comparison against; please check the "master-screenshots" step in the workflow run and rerun it before merging.
+
+      - name: "[Comment] Success: No visual differences introduced by this PR"
+        uses: mshick/add-pr-comment@a65df5f64fc741e91c59b8359a4bc56e57aaf5b1 # pin@v2
+        if: github.event_name == 'pull_request' && steps.master-screenshots-outcome != 'failure' && steps.playwright.outputs.NUM_FAILED == 0
+        with:
+          message: |
+            :heavy_check_mark: No visual differences introduced by this PR.
+            [View Playwright Report](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.event.workflow_run.id }}#artifacts) (note: open the "playwright-report" artifact)
+
+      - name: "[Comment] Warning: Visual differences introduced by this PR"
+        uses: mshick/add-pr-comment@a65df5f64fc741e91c59b8359a4bc56e57aaf5b1 # pin@v2
+        if: github.event_name == 'pull_request' && steps.master-screenshots-outcome != 'failure' && steps.playwright.outputs.NUM_FAILED != 0
+        with:
+          message: |
+            :warning: ${{ steps.playwright.outputs.NUM_FAILED }} visual differences introduced by this PR; please validate if they are desirable.
+            <details>
+            <summary>Playwright Test Results</summary>
+            <pre>
+            ${{ steps.playwright.outputs.PLAYWRIGHT_OUTPUT }}
+            </pre>
+            </details>
+            [View Playwright Report](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.event.workflow_run.id }}#artifacts) (note: open the "playwright-report" artifact)