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I am trying to disable a minor mode (flycheck) for the latex major mode. This is what I have so far.

(defun disable-flycheck-in-tex-src-block ()
  (flycheck-mode -1))

(add-hook 'latex-mode-hook 'disable-flycheck-in-tex-src-block)

However, after I put this into my init.el, flycheck is still enabled when I open a .tex file.

I am using Steve Purcell's emacs configuration here:

https://github.com/purcell/emacs.d

I have added the disable code into lisp/init-local.el, which I thought runs after all the default configuration.

As far as I can tell,

in the init.el, there is a 

(require 'init-flycheck)

Then there is a file called lisp/init-flycheck.el, that looks like this:

(when (maybe-require-package 'flycheck)
  (add-hook 'after-init-hook 'global-flycheck-mode)

  ;; Override default flycheck triggers
  (setq flycheck-check-syntax-automatically '(save idle-change mode-enabled)
        flycheck-idle-change-delay 0.8)

  (setq flycheck-display-errors-function #'flycheck-display-error-messages-unless-error-list))


(provide 'init-flycheck)
bkmoney
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    Show us how you are *enabling* `flycheck-mode` -- it wouldn't be getting enabled unless you've asked for it, and obviously the order is important... – phils Mar 18 '16 at 01:00
  • Ok I have added a description of where flycheck is enabled. – bkmoney Mar 18 '16 at 01:13
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    Right, you're using a globalized mode. That explains your problem. This is a duplicate of http://stackoverflow.com/questions/6837511/automatically-disable-a-global-minor-mode-for-a-specific-major-mode – phils Mar 18 '16 at 01:37
  • That said, I think flycheck is exceedingly unlikely to offer a globalized minor mode without also providing mechanisms to control the buffers for which it will enable `flycheck-mode`, because it's just not sane for flycheck to run everywhere. So I suspect you'll find a clean solution in flycheck itself. Check its documentation. – phils Mar 18 '16 at 01:42

2 Answers2

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As per comments, this is because you're using a globalized minor mode: https://stackoverflow.com/questions/6837511/automatically-disable-a-global-minor-mode-for-a-specific-major-mode

C-hf global-flycheck-mode led me to
C-hf flycheck-may-enable-mode and
C-hv flycheck-global-modes which tells me:

flycheck-global-modes is a variable defined in `flycheck.el'.
Its value is t

  This variable may be risky if used as a file-local variable.

Documentation:
Modes for which `flycheck-mode' is turned on by `global-flycheck-mode'.

If t, Flycheck Mode is turned on for all major modes.  If a list,
Flycheck Mode is turned on for all `major-mode' symbols in that
list.  If the `car' of the list is `not', Flycheck Mode is turned
on for all `major-mode' symbols _not_ in that list.  If nil,
Flycheck Mode is never turned on by `global-flycheck-mode'.

Note that Flycheck is never turned on for modes whose
`mode-class' property is `special' (see Info node `(elisp)Major
Mode Conventions'), regardless of the value of this option.

You can customize this variable.

This variable was introduced, or its default value was changed, in
version 0.23 of the flycheck package.

So while it's not too flexible, if your current value is t then the following is what you need to exclude only these specific modes:

(setq flycheck-global-modes '(not LaTeX-mode latex-mode))
Community
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phils
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  • I have done this, but flycheck is still enabled. Doing C-h v, I get "flycheck-global-modes is a variable defined in `flycheck.el'. Its value is (not LaTeX-mode) Original value was t " – bkmoney Mar 18 '16 at 02:07
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    I'm guessing it's actually `latex-mode` rather than `LaTeX-mode`, then. I've updated the answer to cover both. – phils Mar 18 '16 at 02:19
  • You're welcome. The list at the end of http://emacs.stackexchange.com/a/20915 might also help to clarify matters. – phils Mar 18 '16 at 02:41
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    Can every Emacs SE answer show the _process_ of how the correct answer was found as you demonstrated here? Wish I could +10 this – haff Nov 13 '17 at 17:46
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The variables are CaSe-SeNsItIvE.

Try:

(add-hook 'LaTeX-mode-hook #'disable-flycheck-in-tex-src-block)

I figured out that exact hook name by doing C-h v followed by checking what was available..

Kaushal Modi
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  • Is there supposed to be a # there? I tried changing the case and it is still not working. – bkmoney Mar 17 '16 at 22:36
  • That `#` is optional. Look up online on "elisp sharp quote" convention for function symbols. – Kaushal Modi Mar 17 '16 at 22:37
  • Ok any idea why flycheck is still enabled? – bkmoney Mar 17 '16 at 22:39
  • Also, when i do `describe mode`, I see that "Entering Latex mode runs the hook text-mode-hook, then tex-mode-hook, and finally latex-mode-hook. When the special subshell is initiated, tex-shell-hook' is run." Thats why I put latex-mode-hook instead of LaTeX-mode-hook. – bkmoney Mar 17 '16 at 22:44
  • latex-mode is the stock emacs LaTeX mode. LaTeX-mode is the LaTeX mode from GNU AUCTeX, so it depends on what you are using. – Tassilo Horn Mar 20 '16 at 19:23
  • @TassiloHorn That's good to know. Thanks for the info. – Kaushal Modi Mar 20 '16 at 19:39