Is it possible to have a global minor mode disabled whenever a certain major mode is enabled?

Is it possible to have a global minor mode disabled whenever a certain major mode is enabled?

[James Gregory]

I have a global minor mode (highlight-symbol) that conflicts with a
major mode (js2-mode). I have seen an alternative implementation of
highlight symbol that doesn't conflict, but it has some issues of its
own. I would rather just disable highlight-symbol whenever js2-mode is
loaded, but I can't work out how to do this.

I have some code like this in my init files:

;make it a global mode, and switch it on
(defun highlight-symbol-mode-on ()
  "Turn on function `highlight-symbol-mode'."
  (highlight-symbol-mode 1))

(defun highlight-symbol-mode-off ()
  "Turn off function `highlight-symbol-mode'."
  (highlight-symbol-mode -1))

(define-globalized-minor-mode global-highlight-symbol-mode
highlight-symbol-mode highlight-symbol-mode-on)
(global-highlight-symbol-mode 1)

(add-hook 'js2-mode-hook 'highlight-symbol-mode-off)

///

But though the hook at the end is called, highlight-symbol is still
switched on in js2-mode buffers. I guess this might be because the
global minor mode is enabled after js2-mode has already loaded? Or
some other load-order issue.

Thanks,

James

Re: Is it possible to have a global minor mode disabled whenever a certain major mode is enabled?

[Aidan Gauland]

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James Gregory wrote:
> I have a global minor mode (highlight-symbol) that conflicts with a
> major mode (js2-mode). I have seen an alternative implementation of
> highlight symbol that doesn't conflict, but it has some issues of its
> own. I would rather just disable highlight-symbol whenever js2-mode is
> loaded, but I can't work out how to do this.
> 
> I have some code like this in my init files:
> 
> [snip]
> 
> But though the hook at the end is called, highlight-symbol is still
> switched on in js2-mode buffers. I guess this might be because the
> global minor mode is enabled after js2-mode has already loaded? Or
> some other load-order issue.

According to the Emacs manual, major-mode hooks are run as the *last* step of
initialisation, so I'm not sure why this isn't working for you.  I have an
idea that may or may not be helpful: if highlight-symbol can run hooks, have
it detect the major mode of the current buffer and disable itself.  If that
doesn't work, then, as a rather crude hack, you could have your js2-mode hook
run after a short delay, but that would be unreliable, as it's time dependent.

HTH,
Aidan


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