ci: add clang format script

Author: amaanq

package-lock.json

@@ -16,13 +16,14 @@
   },
   "scripts": {
     "test": "tree-sitter test",
-    "format": "prettier --trailing-comma es5 --write grammar.js",
-    "format-check": "prettier --trailing-comma es5 --check grammar.js"
+    "format": "prettier --trailing-comma es5 --write grammar.js && clang-format -i src/scanner.c",
+    "format-check": "prettier --trailing-comma es5 --check grammar.js && cat src/scanner.c | clang-format src/scanner.c | diff src/scanner.c -"
   },
   "dependencies": {
     "nan": "^2.15.0"
   },
   "devDependencies": {
+    "clang-format": "^1.8.0",
     "prettier": "^2.3.2",
     "tree-sitter-cli": "^0.20.7"
   },