The cons syntax format used by use-package.

The cons syntax format used by use-package.

[Hongyi Zhao]

See here [1] for the Hooks syntax used by use-package, as shown below:

(use-package ace-jump-mode
  :hook ((prog-mode text-mode) . ace-jump-mode))

If I wanted to extend the above example with more hooks, which of the
following would be correct:

(use-package ace-jump-mode
  :hook ((prog-mode text-mode) . ace-jump-mode
             (latex-mode .  ace-jump-mode)))

or

(use-package ace-jump-mode
  :hook (((prog-mode text-mode) . ace-jump-mode)
             (latex-mode .  ace-jump-mode)))

[1] https://github.com/jwiegley/use-package#hooks

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province

Re: The cons syntax format used by use-package.

[Daniel Fleischer]

Hongyi Zhao [2021-09-18 Sat 21:15] wrote:

> (use-package ace-jump-mode
>   :hook ((prog-mode text-mode) . ace-jump-mode))
>
> If I wanted to extend the above example with more hooks, which of the
> following would be correct:

The 2nd one, but why not

(use-package ace-jump-mode
  :hook ((prog-mode text-mode latex-mode) . ace-jump-mode))


-- 

Daniel Fleischer

Re: The cons syntax format used by use-package.

[Hongyi Zhao]

On Sat, Sep 18, 2021 at 9:21 PM Daniel Fleischer <danflscr@gmail.com> wrote:
>
> Hongyi Zhao [2021-09-18 Sat 21:15] wrote:
>
> > (use-package ace-jump-mode
> >   :hook ((prog-mode text-mode) . ace-jump-mode))
> >
> > If I wanted to extend the above example with more hooks, which of the
> > following would be correct:
>
> The 2nd one,

Thank you for pointing this out.

> but why not
>
> (use-package ace-jump-mode
>   :hook ((prog-mode text-mode latex-mode) . ace-jump-mode))

The trivial and redundant one can be easily extended to complex generic form:

(use-package foo
  :hook (((x-mode y-mode) . bar-mode)
             (z-mode .  baz-mode)))

Regards, HZ

Re: The cons syntax format used by use-package.

[Hongyi Zhao]

On Sat, Sep 18, 2021 at 9:21 PM Daniel Fleischer <danflscr@gmail.com> wrote:
>
> Hongyi Zhao [2021-09-18 Sat 21:15] wrote:
>
> > (use-package ace-jump-mode
> >   :hook ((prog-mode text-mode) . ace-jump-mode))
> >
> > If I wanted to extend the above example with more hooks, which of the
> > following would be correct:
>
> The 2nd one, but why not
>
> (use-package ace-jump-mode
>   :hook ((prog-mode text-mode latex-mode) . ace-jump-mode))

This leads me to the following conclusion: Any number of pared nested
parentheses is equivalent in this case, i.e., all the following forms
are valid and equivalent:

:hook ((prog-mode text-mode latex-mode) . ace-jump-mode))
:hook (((prog-mode text-mode latex-mode) . ace-jump-mode)))
:hook ((((prog-mode text-mode latex-mode) . ace-jump-mode))))

But according to my tries, all the above three forms work, but the
following ones don't:

:hook (((((prog-mode text-mode latex-mode) . ace-jump-mode)))))
:hook ((((((prog-mode text-mode latex-mode) . ace-jump-mode))))))
[...]

Any hints for this phenomenon?

Regards, HZ

Re: The cons syntax format used by use-package.

[Daniel Fleischer]

Hongyi Zhao <hongyi.zhao@gmail.com> writes:

> Any hints for this phenomenon?

I don't know, but you can run 'pp-macroexpand-last-sexp' and see how the
expanded code looks like and it might give you hints why some versions
run while the others don't.

-- 

Daniel Fleischer

Re: The cons syntax format used by use-package.

[Hongyi Zhao]

On Sun, Sep 19, 2021 at 3:04 PM Daniel Fleischer <danflscr@gmail.com> wrote:
>
> Hongyi Zhao <hongyi.zhao@gmail.com> writes:
>
> > Any hints for this phenomenon?
>
> I don't know, but you can run 'pp-macroexpand-last-sexp' and see how the
> expanded code looks like and it might give you hints why some versions
> run while the others don't.

The added parentheses will also appear in the expansion result, so I
can't get any valuable clues.

Best, HZ

Re: The cons syntax format used by use-package.

[Emanuel Berg via Users list for the GNU Emacs text editor]

I was showed this method by a certain individual and have used
it since

;; (setq gnus-article-prepare-hook nil)
(defun gnus-article-prepare-hook-f ()
  (gnus-with-article-buffer
    (gnus-article-wash-more) ))
(add-hook 'gnus-article-prepare-hook #'gnus-article-prepare-hook-f)

And this I was showed by another individual

(defun add-one-shot-hook (hook fun)
  (let ((name (cl-gensym)))
    (setf (symbol-function name)
          (lambda (&rest _)
            (remove-hook hook name)
            (funcall fun) ))
    (add-hook hook name) ))

Urban legend: hooks slow down the interactive feel. (Real
mystery: what does?)

And what does "Never hook with a hooker" mean?

Actually it makes sense even tho (especially) because you DO
want to jab with a jabber ...

-- 
underground experts united
https://dataswamp.org/~incal