NeoTree is a directory tree plugin for Emacs that provides a sidebar file explorer. By default, it doesn't open directories in full screen. However, you can make NeoTree open directories in full screen by customizing its behavior. Here's a general approach:
1. **Install NeoTree**: If you haven't already, you need to install NeoTree. You can install it using a package manager like `use-package` if you're using Emacs.
2. **Customize NeoTree Behavior**: Add the following lines to your Emacs configuration file (typically `init.el` or `~/.emacs.d/init.el`) to customize NeoTree's behavior:
```emacs-lisp
;; Define a function to open NeoTree in full screen
(defun neotree-toggle-fullscreen ()
(interactive)
(neotree-toggle)
(if (neo-global--window-exists-p)
(neotree-show)
(neotree-hide)))
;; Keybinding to toggle full screen NeoTree
(global-set-key [f8] 'neotree-toggle-fullscreen)
```
In the code above, we define a function `neotree-toggle-fullscreen` that toggles NeoTree in and out of full screen when called. We then bind this function to a key (F8 in this example), so you can use that key to toggle full-screen NeoTree.
3. **Reload Configuration**: After adding these lines to your Emacs configuration file, save the file and then reload your Emacs configuration, or restart Emacs.
4. **Open NeoTree in Full Screen**: To open NeoTree in full screen for a directory, navigate to the directory in your main buffer, and then press the key you assigned (F8 in the example) to toggle full-screen NeoTree.
This customization allows you to open NeoTree in full screen using a keyboard shortcut. You can modify the keybinding to your preference by changing `[f8]` to a different key sequence.