feature: get only oas files

src/services/find-oas-from-dir.js

@@ -1,24 +1,32 @@
 import path from 'path';
 import * as fs from 'fs';
 
-export default function fromDir(startPath) {
+function isOas(filePath) {
+  const fileString = fs.readFileSync(filePath, 'utf8')
+  const oasRegEx = /^openapi/i
+  return oasRegEx.test(fileString);
+}
+
+export default function findOasFromDir(startPath) {
   if (!fs.existsSync(startPath)) {
     console.log("no dir ", startPath);
     return [];
   }
 
   const files = fs.readdirSync(startPath);
   return files.reduce((acc, file) => {
-    const filename = path.join(startPath, file);
-    const stat = fs.lstatSync(filename);
+    const filePath = path.join(startPath, file);
+    const stat = fs.lstatSync(filePath);
     if (stat.isDirectory()) {
-      return [...acc, ...fromDir(filename)]; //recurse
-  } else if (filename.endsWith('.yaml')) {
-      console.log('-- found: ', filename);
+      return [...acc, ...findOasFromDir(filePath)]; //recurse
+    } 
+    if (file.endsWith('.yaml') && isOas(filePath)) {
+      console.log('-- found: ', filePath);
       return [...acc, {
         filename: file,
         path: startPath
       }]
-  };
+    }
+    return []
   }, []);
 };