Questions tagged [hooks]

Hooks are an important mechanism for customizing Emacs. A hook is a Lisp variable which holds a list of functions, to be called on some well-defined occasion.

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19 views

How to load image using iimage-mode when I first open a markdown file?

I have a file which embeds an image ![](file://tmp.jpg) I have added iimage mode to the markdown mode hook and even added recenter to it (add-hook 'markdown-mode-hook 'iimage-mode) (add-hook '...
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1answer
25 views

How to set setting for one mode only?

I currently have the hook below for displaying tabs when in text mode: (add-hook 'text-mode-hook (lambda () (standard-display-ascii ?\t "!---"))) I only want that setting to apply in text ...
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32 views

Is it possible to make a function local to the buffer?

I want to override the function helm-swoop-pre-input-optimize in man mode using its hook, but not anywhere else. Is there something similar to make-local-variable for functions?
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25 views

set fill-column in org-capture notes

I'm trying to customize the fill-column value for org-add-note when adding notes to an Org TODO (e.g., C-c C-z). I have tried to add the following to the org-add-note function (this seems reasonable ...
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52 views

Why after-init-hook is not invoked? (workaround is emacs-startup-hook)

short story: The theme just did not show up automatically at emacs start, when it is invoked by an after-init-hook. However, with emacs-startup-hook it worked as expected: (use-package heaven-and-...
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1answer
45 views

How do I make file paths clickable/navigable in Shell as described in the documentation?

For the life of me, I cannot get this functionality to work: https://wikemacs.org/wiki/Shell#Make_file_paths_clickable I've run (add-hook 'shell-mode-hook 'compilation-shell-minor-mode) in my .emacs ...
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2answers
51 views

How to increase a magic number in a file buffer on each save

I want to change a magic number (or a time stamp) in a file buffer on each save. The position of the magic number in the buffer can be given through a regex with a keyword or similar. Is there any ...
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20 views

window-configuration-change-hook false positives from desktop-mode

I'm trying to use window-configuration-change-hook in a package to perform some action when a buffer becomes visible for the first time. It works, however when starting Emacs, desktop-mode calls ...
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35 views

after-change-functions global value gets set to nil sometimes

I'm facing a strange issue and I don't know how to debug it. In the middle of work after-change-functions just gets set to nil. I use doom-modeline and it installs hooks to after-change-functions to ...
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40 views

How do I clear a global variable that also is buffer-local?

I called add-hook multiple times because I had a few typos in the hook function, and now there are a bunch of broken copies of it in the hook. I want to do (setq after-save-hook nil), but after doing ...
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34 views

Updating pyenv when switching to a Python buffer

I use pyenv to maintain my python versions and virtualenvs. I really like the way you can create a local .python-version for each project, pointing to the version I need. I use pyenv-mode which allows ...
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19 views

Trouble adding post-self-insert-hook in define-minor-mode

I am trying to write a minor mode that upon visiting a word, it manipulate it. There is a list of words which is parsed from a file. Here is the problem: (define-minor-mode auto-gls-mode "...
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37 views

delete-trailing-whitespace on save while always preserving location of cursor

I have the following before save hook defined which deletes all trailing whitespace and converts tabs to spaces (except in makefile mode since makefiles need tabs to work). This works great, however, ...
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31 views

How to automatically enable a mode for only one specfic type of buffer?

I user dired to browse file, and I would like to use hl-line-mode which highlights the currents line, but I only want it to be enabled automatically when using dired
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1answer
48 views

Cannot run a file-local after-save-hook with arguments

I have been trying to make auto-save compilation rules for my org files. I have tested the following functions in the interpreter: (defun async-shell-command-no-window (command) (interactive) (...
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19 views

Haskell-mode-hook help window keeps opening

I installed haskell-mode, but every time I press RET or TAB on a Haskell file it keeps opening that window Any idea on how to deactivate this ?
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60 views

Run a function before/after magit runs git

I'd like to run a function before magit runs git, and another one after magit runs git. I see magit-pre-start-git-hook but I don't see any post-finish-git hook. How can I run commands before and after ...
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76 views

Run function after specific snippet

I have a workflow that goes like, 1) use a snippet then 2) call a function. What a glorious opportunity to automate! But how? The snippet ipdb inserts import ipdb; ipdb.set_trace(). It has ...
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86 views

Why (lambda () (run-hooks 'foo)) instead of just 'foo?

I am studying the following code snippet taken from prelude-c.el: ;; taken from prelude-c.el (defun prelude-makefile-mode-defaults () (whitespace-toggle-options '(tabs)) (setq indent-tabs-mode t)...
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1answer
46 views

ibuffer-expert not working

I want to make my ibuffer not to be pompted. So it is my config for ibuffer (setq ibuffer-expert t) ;; disable prompt when deleting modified buffer. (add-hook 'ibuffer-hook (lambda () (...
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36 views

How to run function after specific buffer has been saved

If i want to run function when buffer "k" is saved, is there a better way to do this, then just using add hook and checking buffers name in function?
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Alarmbell on saving .py file if linting errors using flake8

I'd like to configure Emacs to play an audible noise when saving my .py files but only if there is a linting error present. I currently have flycheck linting done on the fly and autopep8 settings ...
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2answers
139 views

Are there hooks for leaving modes?

There seems to be a bug in clojure-mode (mentioned here) because it does things in a mode hook (for paredit-mode) but doesn't undo them when the mode is turned off. I understand that add-hook can ...
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91 views

how to hook tern and web mode on certain files

I would like for tern to work only on React related files and Tern to only activate when working on React files with Web Mode turned on. Currently, I have tern generally set up with Web Mode, but the ...
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1answer
55 views

Tramp keep losing remote file permissions

I use: Emacs 26.1 on Windows 10 with tramp with plink/pscp to edit perl scripts on a remote Linux server The scripts are executable (permissions 755). When I load and then save them, if short time ...
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61 views

How to automatically remove a hook provided by a minor mode after disabling that mode?

I want to write a minor which evaluates some code in the buffer after saving a file. I activate after-save-hook for this mode: (add-hook 'my-minor-mode-name-hook #'(lambda () (add-hook 'after-save-...
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1answer
23 views

Set prefix key on load of minor mode

I am trying to change the default prefix key C-c @ to C-c for outline-minor-mode: (define-key outline-minor-mode-map (kbd "C-c") (lookup-key outline-minor-mode-map (kbd "C-c @"))) This ...
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1answer
72 views

Check if current user undoing/redoing?

Is there a way so that the Emacs are able to tell if the current user is undoing/redoing in the current buffer? Here is the task I want to accomplish, I have add a hook to after-change-function, it ...
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1answer
26 views

Function that outputs changes made in buffer

Is there any function that would tell me what changes were made to buffer? I know i can use change hooks to detect changes, but i can't find how to get output of changes. More specifically I would ...
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1answer
94 views

Execute function when (after) window scrolls

I need to execute a function every time a window scrolls. I mean the function to be executed at point "after" the window has been scrolled (with C-v, M-v or with the <down> key). I tried: (add-...
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1answer
51 views

Hook when line number changes

Is there a hook which runs when the cursor position changes its current line numbers? For a concrete toy problem, can i highlight the current line as yellow when the line number of the current cursor ...
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1answer
23 views

Hooking on to abbreviation expansion

I don't know exactly how abbrev-mode works, but I suppose certain keys --spaces and stops-- cause an examination of the word before point, and a replacement of it in some cases. My question is how ...
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89 views

Which hooks guarantee proper (re)displaying of windows after windows configuration is changed?

I'm writing a simple minor mode (for personal use) which dynamically sets fringes according to current window width. I added a dedicated function to those hooks: window-configuration-change-hook ...
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391 views

Adding multiple functions to a hook

I'm looking to add some elisp to my init file that will execute a number of additional functions when I call a particular command. More specifically, when I execute the compile and view command using ...
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1answer
104 views

In org mode, how can I make a post-capture hook run only for certain capture templates?

I have several capture templates. With one of them, I want an Elisp function to transform the contents before saving it. I know of org-capture-prepare-finalize-hook, but this will run for every ...
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1answer
72 views

Scrollbar only on selected buffer

I'm using toggle-scroll-bar to show scrollbar on my frame. But is there a way to show scrollbar only on the selected buffer? I think I can use focus-in-hook to detect when a buffer is active, but I ...
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1answer
419 views

How to set mode hook with lambda using use-package

I'm attempting to set the following hook using use-package, but it's not getting applied. Normal elisp: (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1))) Using use-package: (use-package ...
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2answers
62 views

How to find in which hook(s) a certain function is called?

I'm using the lsp layer on Spacemacs with javascript-backend 'lsp and it activates two modes I don't like: lsp-ui-mode and eldoc. I found lsp-ui-mode inside lsp-mode-hook and added (remove-hook 'lsp-...
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72 views

How to suppress a minor mode's key binding in only certain major modes?

Suppose that I use minor mode MIN with a whole bunch of major modes. In one of those major modes, call it MAJ1, MIN's binding for a specific key K is undesirable; I would therefore like to suppress ...
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105 views

Unable to initialize org agenda with log on Emacs startup

I have been able to initialize org agenda on Emacs startup with: (add-hook 'emacs-startup-hook 'org-agenda-list) However, now I want to initialize org agenda directly with log mode, and I haven't ...
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1answer
107 views

Running a function every time a character is inserted

I want to check its properties as soon as a Greek word has been inserted into the buffer. As far as I can see, this requires me to check each time the buffer changes, whether, if a Greek word was ...
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2answers
114 views

how to add a hook to a custom interactive command

I have a pipeline that opens an emacs client in notmuch-mode when new mail comes in, currently using (notmuch-show "thread:..."). I'd rather use tree view with the most recent message displayed. In ...
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1answer
357 views

Different themes in different modes

I would like to do the following: load some theme when working on a particular kind of source file (say, Haskell), but elsewhere use a different "default" theme. I naively imagine that this is ...
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0answers
39 views

Org-mode :results file hook to launch file

My scenario python code creating a wav file last line of code returns the written file name org-mode src block with the option :results file The result block correctly links to the audio file, and I ...
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1answer
203 views

Hook with quoted lambda as an argument

I been reading a blog post from Chris Wanstrath from 2010 where he write about coffee-mode. He proposed there this functions hook: (defun coffee-custom () "coffee-mode-hook" ;; Emacs key binding ...
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1answer
787 views

automatic latex-preview-pane with auctex and or-mode latex export

To enable automatic latex-preview-pane-mode with AUCTex I bound it to a hook: (add-hook 'LaTeX-mode-hook 'latex-preview-pane-mode) This works. When I open a *.tex file, then latex-preview-pane-mode ...
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2answers
62 views

Best hook to keep my regexp highlighted

I need to have non-ASCII chars highlighted in my latex-mode buffers. So I added this lines in my .emacs: (add-hook 'LaTeX-mode-hook '(lambda () (highlight-regexp "[^[:ascii:]]" 'custom-...
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1answer
427 views

Spacemacs trigger holy mode in major mode

I'm using Spacemacs for clojure development and have gotten used to the vim commands mostly. However, when I start up a Repl I would like to only use holy mode with insert mode. Does anyone know how/...
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1answer
217 views

Delete auto-save file when killing Emacs without saving buffer

When I have unsaved buffers and I kill Emacs with save-buffers-kill-terminal (C-x C-c) I'm asked whether to save each buffer. Is it possible to delete a buffer's auto-save data when I answer n? I had ...
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1answer
93 views

Load custom highlighting after colorscheme change

I am a Vim user and i recently decided to try Emacs Spacemacs, i have a problem setting up custom highlighting, i set some lines like the following in my .spacemacs (i guess it's the same problem in ...