Questions tagged [setf]

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Setf not expanding

I'm trying to modify a member of lsp--client after registration. So I have something like the following in use-package. (message "%s %s" (symbol-function 'lsp--client-new-connection) (...
Todd's user avatar
  • 211
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Getting error in hook: Symbol’s function definition is void: \(setf\ ekg-note-tags\)

I'm writing a pre-save hook for ekg (emacs knowledge graph), and getting an error I don't know how to figure out. The error is triples--with-transaction: Symbol’s function definition is void: \(setf\ ...
GaryO's user avatar
  • 496
1 vote
1 answer

How to find if an Emacs lisp function is setf-able?

Emacs Lisp setf macro allows you to set generalized variables. You can, for example change the size of the current window with the following form: (setf (window-height) 10) The macro will translate ...
PRouleau's user avatar
  • 786
2 votes
2 answers

setf + alist-get but with "equal" instead of "eq"?

I got a suggestion to use setf to replace value in an alist: Replace element in a list / add in case of absence, with custom test/key functions The example was provided, but it doesn't work if key is ...
gavenkoa's user avatar
  • 3,362
2 votes
1 answer

`cl-incf` returns inconsistent values

(setq ali '()) >>> nil (cl-incf (alist-get 'a ali 0)) >>> ((a . 1)) (setf (alist-get 'b ali) 0) >>> ((b . 0) (a . 1)) (cl-incf (alist-get 'b ali 0)) >>> 1 As you ...
Artem Yu's user avatar
  • 145
4 votes
1 answer

How can I make `setf` work with `plist-get`?

There's no built-in setter for plist-get. Example: (let ((pl '(:what (one)))) (push 'two (plist-get pl :what)) pl) Error: let*: Symbol’s function definition is void: \(setf\ plist-get\) How can I ...
user3496846's user avatar
2 votes
0 answers

Is there a generalized setter for buffer-modified-p?

It is very simple to define a simple generalized setter for buffer-modified-p: (gv-define-simple-setter buffer-modified-p set-buffer-modified-p) That enables constructs like: (with-current-buffer "...
Tobias's user avatar
  • 32.8k
0 votes
3 answers

How do I remove :width and :height from an image created with create-image?

I am trying to make jabber.el support images sent from e.g. Conversations. I download the image using url-retrieve-synchonously and call create-image to get an image which I can then use with insert-...
asjo's user avatar
  • 1,047
7 votes
1 answer

Setf weird expansion

Trying to understand what setf can do, I called (macroexpand '(setf (aref vec i) val)) ⇒ (let* ((v vec) (v i)) (aset v v val)) This seems obviously wrong. However I couldn't create an actual ...
phs's user avatar
  • 1,105