refactor condition

src/compiler.js

@@ -15,17 +15,11 @@ function compileFileOrFiles (filename, isDirectory, cb) {
 
   // TODO: for now assumes filepath dir contains all tests, later all this
   // should be replaced with remix's & browser solidity compiler code
-  if (isDirectory) {
-    filepath = filename
-    fs.readdirSync(filename).forEach(file => {
-      sources[file] = {content: fs.readFileSync(path.join(filename, file)).toString()}
-    })
-  } else {
-    filepath = path.dirname(filename)
+  filepath = (isDirectory ? filename : path.dirname(filename))
+
   fs.readdirSync(filepath).forEach(file => {
     sources[file] = {content: fs.readFileSync(path.join(filepath, file)).toString()}
   })
-  }
 
   async.waterfall([
     function loadCompiler (next) {