Improve virtualenv aware by searching subdirectories (#57)

* Improve virtualenv aware by searching subdirectories

* Convert sync into async

* Run prettier and switch from var to let/const

Author: uoo723

lib/main.js

@@ -31,14 +31,46 @@ class PythonLanguageClient extends AutoLanguageClient {
   async startServerProcess(projectPath) {
     await new Promise(resolve => atom.whenShellEnvironmentLoaded(resolve));
 
-    var venvPromise = new Directory(projectPath).getSubdirectory('bin')
-                                                .getFile('python')
-                                                .exists();
+    const entries = await new Promise(resolve =>
+      new Directory(projectPath).getEntries((error, entries) => {
+        if (error === null) {
+          resolve(entries);
+        } else {
+          resolve(null);
+        }
+      })
+    );
+
+    let venvPath = null;
+
+    if (entries) {
+      for (let entry of entries) {
+        if (entry.isDirectory()) {
+          if (
+            entry.getBaseName() === "bin" &&
+            (await entry.getFile("python").exists())
+          ) {
+            venvPath = projectPath;
+            break;
+          } else {
+            if (
+              await entry
+                .getSubdirectory("bin")
+                .getFile("python")
+                .exists()
+            ) {
+              venvPath = entry.getPath();
+              break;
+            }
+          }
+        }
+      }
+    }
 
-    var pylsEnvironment = Object.assign({}, process.env);
+    const pylsEnvironment = Object.assign({}, process.env);
 
-    if(await venvPromise) {
-      pylsEnvironment['VIRTUAL_ENV'] = projectPath;
+    if (venvPath) {
+      pylsEnvironment["VIRTUAL_ENV"] = venvPath;
     }
 
     const childProcess = cp.spawn(atom.config.get("ide-python.pylsPath"), {