Add autoopen option

lib/tree-view-package.js

@@ -21,7 +21,10 @@ class TreeViewPackage {
     }))
 
     const treeView = this.getTreeViewInstance()
-    const showOnAttach = !atom.workspace.getActivePaneItem()
+    const showOnAttach = (
+      atom.config.get('tree-view.showOnAttach') &&
+      !atom.workspace.getActivePaneItem()
+    )
     this.treeViewOpenPromise = atom.workspace.open(treeView, {
       activatePane: showOnAttach,
       activateItem: showOnAttach

package.json

@@ -94,6 +94,11 @@
       "type": "boolean",
       "default": false,
       "description": "When opening a file, always focus an already-existing view of the file even if it's in another pane."
+    },
+    "showOnAttach": {
+      "type": "boolean",
+      "default": true,
+      "description": "Show tree view when a new window is opened."
     }
   }
 }