Account for umbrella projects when determining project path

Author: mauricerkelly

lib/init.js

@@ -31,6 +31,19 @@ const findElixirProjectPath = async (editorPath) => {
   const editorDir = dirname(editorPath);
   const mixexsPath = find(editorDir, 'mix.exs');
   if (mixexsPath !== null) {
+    const pathArray = mixexsPath.split('/');
+    if (pathArray.length > 3 && pathArray[pathArray.length - 3] === 'apps') {
+      //  Treat this as an umbrella app. This may be wrong -
+      //  If you happen to keep your code in a directory called 'apps'
+      pathArray.splice((pathArray.length - 3), 3);
+      const umbrellaProjectPath = pathArray.join('/');
+
+      //  Safety check by looking for a `mix.exs` file in the same directory as
+      //  'apps'. If it exists, then it's likely an umbrella project
+      if (existsSync(join(umbrellaProjectPath, 'mix.exs'))) {
+        return umbrellaProjectPath;
+      }
+    }
     return dirname(mixexsPath);
   }
   const projPath = atom.project.relativizePath(editorPath)[0];