Can a hook be removed for a specific file?
reddit / emacs

----------------------------------------------------------------------
Pay08 · 2022-12-20 18:03

When I try to save anything for the first time in an Emacs session,
emms tries to save the history file which then throws up an lsp-mode
error saying that the file can't be formatted. Is there a way to call
`remove-hook` for that one specific file?

----------------------------------------------------------------------
popska · 2022-12-20 18:22

file local variables ([https://www.emacswiki.org/emacs/FileLocalVariab
les](https://www.emacswiki.org/emacs/FileLocalVariables)) is probably
what you are looking for.

if you specifically want to call remove-hook whenever you open a file
you can put something like this at the top of your file: `-*- eval:
(remove-hook ...) -*-`

----------------------------------------------------------------------
Pay08 · 2022-12-20 20:40

Do file local variables work with simple text files?

----------------------------------------------------------------------
wasamasa · 2022-12-20 22:06

One alternative is to write a smarter hook function with a
conditional:

    (defun my-hook ()
      (when condition
        (do-the-thing)))

Or even better, using the hook on specific modes only. For example you
could use `prog-mode-hook` so that the hook function isn't run in
history buffers in the first place (because they aren't using modes
derived from `prog-mode`).

----------------------------------------------------------------------
popska · 2022-12-20 22:41

yep, file local variables will work with all files.

​

the only consideration is that for files which are parsed by something
else (i.e. a source code file) you will need to make sure it is in a
comment, for example in C:

`/* -*- (file local variable things here...) -*- */`

----------------------------------------------------------------------
Pay08 · 2022-12-21 06:02

>using the hook on specific modes only

That wouldn't work. The file isn't opened beforehand, just saved.

----------------------------------------------------------------------
luiggi_oasis · 2022-12-21 15:46

The only minor drawback is that you get prompted about executing code
when you open the file, right? Like a security kind of thing. You can
answer Y and whitelist it forever I think.