Start Treemacs with prog-mode?

[JPRuehmann]

Hello I try to find a Way to open treemacs automaticaly with prog-mode. I've tried :hook (prog-mode . treemacs) and :init (add-hook 'pog-mode-hook 'treemacs. But both did not work, instead a second Window (scratch) with treemacs gets opened beside the dashboard at startup.

My Goal is to get treemacs started at opening a project with projectile. Thanks,

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[Alexander-Miller]

I don' think a general hook is the right approach, as that means you'd call treemacs for every new prog buffer, especially the ones you don't expect to derive from prog-mode. You'd need to add some extra config to make sure treemacs opens only once.

It might be easier to integrate treemacs with your projectile workflow - how exactly do you open your projects?

[JPRuehmann]

Via click on the Link in the Dashboard.

[Alexander-Miller]

In that case you need to find out what function this click invokes. Maybe there is already a hook for it, maybe you need to use advice. Either way you need something like this:

(defun open-treemacs-after-click ()
  (save-selected-window (treemacs-select-window)))
(add-hook 'dashboard-after-click-hook #'open-treemacs-after-click)
(advice-add #'dashboard-click :after #'open-treemacs-after-click)