Add +treemacs/toggle command

modules/ui/treemacs/autoload.el

@@ -0,0 +1,22 @@
+;;; ui/treemacs/autoload.el -*- lexical-binding: t; -*-
+
+;;;###autoload
+(defun +treemacs/toggle ()
+  "Initialize or toggle treemacs.
+* If the treemacs window is visible hide it.
+* If a treemacs buffer exists, but is not visible show it.
+* If no treemacs buffer exists for the current frame create and show it.
+* If the workspace is empty additionally ask for the root path of the first
+  project to add."
+  (interactive)
+  (require 'treemacs)
+  (-pcase (treemacs--current-visibility)
+    ['visible (delete-window (treemacs--is-visible?))]
+    ['exists  (treemacs-select-window)]
+    ['none
+     (let ((project-root (doom-project-root 'nocache)))
+       (when project-root
+         (unless (treemacs--find-project-for-path project-root)
+           (treemacs-add-project-at (treemacs--canonical-path project-root)
+                                    (doom-project-name 'nocache))))
+       (treemacs--init project-root))]))