workflow: post build result as comment

.editorconfig

@@ -9,5 +9,8 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.md]
+[*.{markdown,md}]
 trim_trailing_whitespace = false
+
+[*.{yaml,yml}]
+indent_size = 2

.github/workflows/fpb-lint.yml

@@ -1,20 +1,42 @@
 name: free-programming-books-lint
-
-on: [push, pull_request]
-
+on:
+  push:
+  pull_request:
 jobs:
   build:
-
+    permissions:
+      pull-requests: write
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js
       uses: actions/setup-node@v1
       with:
         node-version: '14.x'
-    - run: npm install -g free-programming-books-lint
-    - run: fpb-lint ./books/
-    - run: fpb-lint ./casts/
-    - run: fpb-lint ./courses/
-    - run: fpb-lint ./more/
+    - run: |
+        git clone https://github.com/SethFalco/free-programming-books-lint.git
+        cd free-programming-books-lint
+        git checkout origin/multiple-dirs
+        npm i
+        npm i -g .
+    - run: fpb-lint books casts courses more
+      if: github.event_name == 'push'
+    - run: |
+        fpb-lint books casts courses more 2>&1 | tee output.log
+        result_code=${PIPESTATUS[0]}
+
+        if [ $result_code != 0 ]
+        then
+          gh pr review $PR --body "The build failed with the following output:
+          \`\`\`
+          $(cat output.log)
+          \`\`\`" --request-changes
+        else
+          gh pr review $PR --approve
+        fi
+
+        exit $result_code
+      if: github.event_name == 'pull_request'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        PR: ${{ github.event.pull_request.html_url }}