32
votes
Accepted
What is the difference between ' and #' in front of a symbol?
In Emacs Lisp, if foo is a symbol, then 'foo and #'foo are completely equivalent. The latter form (with #') is preferred when foo is a function, as it documents the fact that it is intended to be ...
- 5,680
25
votes
Accepted
Remove hooks for specific modes
I don't have any experience with the use-package macro, but in principle, you could use the third argument to remove-hook which tells it to remove the function only from the local hook:
(remove-hook '...
Dan♦
- 32.3k
21
votes
Accepted
Run command when opening a file of a specific filetype
In Emacs terminology, these are two different steps:
Associate files with the .ts extension with the major mode typescript-mode.
Run the function tss-setup-current-buffer when Typescript mode starts.
...
21
votes
Accepted
What's the difference between after-init-hook and emacs-startup-hook
See the Startup Summary section of the Emacs Lisp manual for a detailed description of the things that happen when you start Emacs.
The emacs-startup-hook runs later than the after-init-hook.
One ...
- 20.1k
14
votes
Accepted
add-to-list vs add-hook?
The question you asked
The biggest difference is the last argument:
local for add-hook and
compare-fn for add-to-list.
This means that you have no control over how add-hook decides whether it ...
- 5,838
14
votes
How to avail of `:hook` using use-package?
As others said I think https://github.com/jwiegley/use-package#hooks
is pretty clear. :hook replaces add-hook and creates autoloads for
you. Your example with :hook would be:
(use-package web-mode
:...
- 386
12
votes
Accepted
Run code right after compilation
Try using compilation-finish-functions:
(defun my-compilation-finish-function (buffer desc)
(message "Buffer %s: %s" buffer desc))
(add-hook 'compilation-finish-functions 'my-compilation-finish-...
- 21.7k
12
votes
Accepted
how to unbind a mode hook without restarting
Using function symbols certainly makes this easier (and this is one of the reasons why I would recommend always using that approach). You can still use remove-hook with the lambda form, though -- it ...
- 47.3k
11
votes
Run command when opening a file of a specific filetype
What you are looking for is find-file-hook:
(add-hook 'find-file-hook 'my-project-hook)
(defun my-project-hook ()
(when (string= (file-name-extension buffer-file-name) "ts")
(typescript-mode)
...
- 5,838
11
votes
Accepted
Quitting Emacs and re-enabeling touchpad
You can use kill-emacs-hook which is run when emacs is quit 'normally'.
Hook run when kill-emacs is called. Since kill-emacs may be
invoked when the terminal is disconnected (or in other similar
...
- 7,438
11
votes
Accepted
Prevent folding org files opened by ediff
It sounds like your goal is to have org-mode files always show everything when in ediff. The simplest solution is probably to avoid the local variables approach and just put show-all in the relevant ...
Dan♦
- 32.3k
10
votes
Accepted
How to automatically remove a hook provided by a minor mode after disabling that mode?
The minor mode's hook is called both when activating and deactivating the minor mode, so how 'bout
(add-hook 'my-minor-mode-name-hook
(lambda ()
(if my-minor-mode-name
...
- 26k
9
votes
Accepted
Run function after specific snippet
You can make snippet-specific bindings with # expand-env:
# -*- mode: snippet -*-
# name: ipdb
# key: ipdb
# expand-env: ((yas-after-exit-snippet-hook #'bm-toggle))
# --
import ipdb; ipdb.set_trace()
...
- 8,983
8
votes
Accepted
(la)tex-mode-hook doesn't work?
If you have AUCTeX installed, then you're presumably using AUCTeX's modes, so the hooks you need to use have names of the form TeX-mode-hook and LaTeX-mode-hook (note the capitalization).
- 26k
8
votes
Buffer-local after-save-hook?
This is standard functionality built into add-hook:
add-hook is a compiled Lisp function in ‘subr.el’.
(add-hook HOOK FUNCTION &optional APPEND LOCAL)
Add to the value of HOOK the ...
- 47.3k
8
votes
Accepted
How to replace focus-out-hook with after-focus-change-function in emacs 27?
You could try using something like:
(add-function :after after-focus-change-function #'your-function-here)
So, in your case, something like this should do what you are after:
(add-function :after ...
- 3,099
8
votes
Accepted
Add hooks for a file type based on org-mode
(define-derived-mode hy-mode org-mode "Hy Mode"
"Major mode for editing *.hy files."
do-whatever-you-want-here)
(add-to-list 'auto-mode-alist '("\\.hy\\'" . hy-mode))...
- 47.3k
7
votes
Accepted
What's a good way to have a hook that runs for every file in a given directory?
find-file-hook, and in your hook function, check whether the candidate file is in the given directory.
- 74.6k
7
votes
Accepted
Use `.dir-locals.el' to append to `before-save-hook' as a buffer local variable
(add-hook 'before-save-hook #'clang-format-buffer nil t)
This is the right way to add a function locally to a hook.
This will set before-save-hook as a buffer local variable ignoring everything ...
- 22.8k
7
votes
Accepted
How to run an `after-save-hook` only when the buffer has been saved manually
Firstly you need to define what "saved manually" actually means. It could cover multiple commands, to my mind. M-x apropos-command RET save\|write RET probably includes all the typical cases.
Once ...
- 47.3k
7
votes
Accepted
What is a hook?
Your understanding of Emacs Lisp notion of hook is absolutely correct. Indeed,
“normal” hooks are just lists of functions (every function doesn't take
arguments, otherwise it's not usually called “...
- 4,893
7
votes
Is there a standard function that applies a list of predicates to a value until success?
You can use cl-some to apply a list of predicates to a value:
(cl-some (lambda (p) (funcall p "some value"))
'(vectorp listp stringp))
I suppose you could wrap this in a function. Although ...
- 1,483
7
votes
Accepted
Why is this function not working properly, when added to a hook?
Dunno what Evil might change in the picture (try without Evil, to see if there is a difference).
But if you are interested in the buffer name of a buffer visiting a file then what you should use is ...
- 74.6k
7
votes
Accepted
Is there a hook I can use to run my function when point moves?
I think post-command-hook is what you wish to use.
It is run every time a command has been run. And a command is basically any interactive action, such as clicking a mouse button, typing a letter (...
- 2,401
7
votes
Accepted
How to track user changes in the buffer?
To react to buffer changes, you generally want to use after-change-functions (or sometimes before-change-functions).
These hooks are run everytime some part of the buffer is modified, either by ...
- 26k
7
votes
Accepted
Looking for something like a `first-keypress-in-a-while-hook`
You could try:
(defun my-run-fkpiawh ()
(remove-hook 'pre-command-hook #'my-run-fkpiawh)
(run-hooks 'first-keypress-in-a-while-hook))
(run-with-idle-timer 1200 t (lambda ()
...
- 26k
7
votes
Accepted
Hook with quoted lambda as an argument
(add-hook 'coffee-mode-hook '(lambda () (coffee-custom)))
Definitely not recommended.
Quoting lambdas like that is not good practice.
As you say, (add-hook 'coffee-mode-hook #'coffee-custom) would ...
- 47.3k
6
votes
What's a good way to have a hook that runs for every file in a given directory?
This sounds like what directory local variables are for. Just create a .dir-locals.el file in the directory with the settings you want, and every file will inherit those settings.
- 12.6k
6
votes
Smart minor mode toggle depending on major mode
A hook expects its entries to be functions. (fci-mode 1) is not a function.
What you want to use as a function is presumably turn-on-fci-mode, if that function exists, or (lambda () (fci-mode 1)), ...
- 74.6k
6
votes
Accepted
Run hook on new buffer
You can advise create-file-buffer, if you care only about file buffers.
Likewise, you can advise rename-buffer.
That's what uniquify does, for instance. Are you familiar with uniquify.el? Maybe it ...
- 74.6k
Only top scored, non community-wiki answers of a minimum length are eligible