ci: comment compare

.github/workflows/test262.yml

@@ -18,7 +18,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-latest, macos-latest, ubuntu-latest]
+#        os: [windows-latest, macos-latest, ubuntu-latest]
+        os: [ubuntu-latest]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -50,7 +51,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-latest, macos-latest, ubuntu-latest]
+#        os: [windows-latest, macos-latest, ubuntu-latest]
+        os: [ubuntu-latest]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -73,4 +75,49 @@ jobs:
         with:
           name: new_results
       - name: Compare results on ${{ matrix.os }}
-        run: cargo xtask compare ./base_results.json ./new_results.json  --markdown
+        if: github.event_name == 'pull_request'
+        id: comparison
+        shell: bash
+        run: |
+          comment="$(cargo xtask compare ./base_results.json ./new_results.json  --markdown)"
+          comment="${comment//'%'/'%25'}"
+          comment="${comment//$'\n'/'%0A'}"
+          comment="${comment//$'\r'/'%0D'}"
+          echo "::set-output name=comment::$comment"
+
+      - name: Get the PR number
+        if: github.event_name == 'pull_request'
+        id: pr-number
+        uses: kkak10/pr-number-action@v1.3
+
+      - name: Find Previous Comment
+        if: github.event_name == 'pull_request'
+        uses: peter-evans/find-comment@v1.3.0
+        id: previous-comment
+        with:
+          issue-number: ${{ steps.pr-number.outputs.pr }}
+          body-includes: Test262 conformance changes
+
+      - name: Update comment
+        if: github.event_name == 'pull_request' && steps.previous-comment.outputs.comment-id
+        uses: peter-evans/create-or-update-comment@v1.4.5
+        continue-on-error: true
+        with:
+          comment-id: ${{ steps.previous-comment.outputs.comment-id }}
+          body: |
+            ### Test262 coverage results
+
+            ${{ steps.comparison.outputs.comment }}
+          edit-mode: replace
+
+      - name: Write a new comment
+        if: github.event_name == 'pull_request' && !steps.previous-comment.outputs.comment-id
+        uses: peter-evans/create-or-update-comment@v1.4.5
+        continue-on-error: true
+        with:
+          issue-number: ${{ steps.pr-number.outputs.pr }}
+          body: |
+            ### Test262 coverage results
+
+            ${{ steps.comparison.outputs.comment }}
+