Fix Reviewdog workflow

.github/workflows/reviewdog.yml

@@ -1,7 +1,7 @@
 name: reviewdog
 
 on:
-  - pull_request
+    - pull_request
 
 jobs:
   prettier:
@@ -12,6 +12,20 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - name: Get changed files
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          # Use the GitHub API to get the list of changed files
+          # documenation: https://docs.github.com/rest/commits/commits#compare-two-commits
+          DIFF_DOCUMENTS=$(gh api repos/{owner}/{repo}/compare/${{ env.BASE_SHA }}...${{ env.HEAD_SHA }} \
+            --jq '.files | .[] | select(.status|IN("added", "modified", "renamed", "copied", "changed")) | .filename')
+          # filter out files that are not markdown
+          DIFF_DOCUMENTS=$(echo "${DIFF_DOCUMENTS}" | egrep -i "^files/.*\.md$" | xargs)
+          echo "DIFF_DOCUMENTS=${DIFF_DOCUMENTS}" >> $GITHUB_ENV
+
       - name: Setup Node.js environment
         uses: actions/setup-node@v3
         with:
@@ -24,7 +38,11 @@ jobs:
           # https://github.com/microsoft/vscode-ripgrep#github-api-limit-note
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Perform linting
+        run: yarn prettier -w "${{ env.DIFF_DOCUMENTS }}"
+
       - name: Submit suggestion
         uses: reviewdog/action-suggester@v1
         with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           tool_name: prettier