Emacs: How to enable toolbar mode and menubar mode only under a certain mode?

Question

I use Emacs. However, I am not familiar with Lisp although I do know some functional programming, and hence I never really understood how to customize the init.el.

So basically, I want to be able to enable the toolbar mode and menubar mode only if I am in R-mode.

I know that to enable these mode simply requires:

(tool-bar-mode 1) and (menu-bar-mode 1)

but what if I want to do this locally, i.e. enable them only if I am in R-mode.

What should I put in the init.el ?

Answer 1

tool-bar-mode and menu-bar-mode being a global modes, you can enable them using a mode hook, but all buffers in all frames will be affected.

Never used it, but you may be interested by toolbar-here-mode

In addition to defining minor mode tool-bar-pop-up-mode, this
library defines minor mode tool-bar-here-mode, which is the
same as the global tool-bar-mode except that it affects only
the current frame.

For menu-bar-mode, you have the toggle-menu-bar-mode-from-frame function:

(toggle-menu-bar-mode-from-frame &optional ARG)

Toggle menu bar on or off, based on the status of the current frame. See `menu-bar-mode' for more information

And use it with a key, for example in your init file:

(global-set-key [f2] 'toggle-menu-bar-mode-from-frame)