From: Hongyi Zhao <hongyi.zhao@gmail.com>
To: Tassilo Horn <tsdh@gnu.org>
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: Add/remove an element into/from a cons.
Date: Tue, 26 Oct 2021 14:07:08 +0800 [thread overview]
Message-ID: <CAGP6PO+3VvY5QeYpe2bdNLhOQcrvRsyvzddk3pqiyi=_wZ_MLg@mail.gmail.com> (raw)
In-Reply-To: <CAGP6PO+Qx4jSNqfqWknfb0AZN=8JXWvJZi-r9z3v=Fay986mCw@mail.gmail.com>
On Tue, Oct 26, 2021 at 1:42 PM Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
>
> On Tue, Oct 26, 2021 at 1:40 PM Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
> >
> > On Tue, Oct 26, 2021 at 12:58 PM Tassilo Horn <tsdh@gnu.org> wrote:
> > >
> > > Hongyi Zhao <hongyi.zhao@gmail.com> writes:
> > >
> > > > How can I add/remove an element into/from a cons, taking the following
> > > > one as an example:
> > > >
> > > > ```emacs-lisp
> > > > (setq company-backends '((company-tabnine :separate company-capf
> > > > company-dabbrev company-keywords company-files company-ispell)))
> > > > ```
> > > >
> > > > How can I remove `company-ispell` from and re-add it into the
> > > > company-backends defined above?
> > >
> > > You can use `setf' with the place being the alist entry like this
> > > (company-backends replaced with th/test in my example):
> > >
> > > --8<---------------cut here---------------start------------->8---
> > > (setq th/test '(( company-tabnine :separate company-capf company-dabbrev
> > > company-keywords company-files company-ispell)))
> > >
> > > (let ((place (assoc 'company-tabnine th/test)))
> > > (setf place (remove 'company-ispell place)))
> > > --8<---------------cut here---------------end--------------->8---
> >
> > Yes. It does the trick:
> >
> > `C-j' (setq th/test '((company-tabnine :separate company-capf company-dabbrev
> > company-keywords company-ispell company-files)))
> >
> > ;; ((company-tabnine :separate company-capf company-dabbrev
> > company-keywords company-ispell company-files))
> >
> >
> > `C-j' (setq th/test (let ((place (assoc 'company-tabnine th/test)))
> > (setf place (remove 'company-ispell place))))
> >
> > ;; (company-tabnine :separate company-capf company-dabbrev
> > company-keywords company-files)
> >
> > But how to add it back to the alist?
>
> I mean: But how to add it back to its original position in the list?
BTW, I want to use the above trick to simplify the following function
but failed:
(setq company-backends '((company-tabnine :separate company-dabbrev
company-keywords company-files company-ispell company-capf)))
(defun my-scratch-init ()
(with-current-buffer "*scratch*"
(setq-local company-backends
'((company-tabnine :separate company-capf company-dabbrev
company-keywords company-files)))
))
==>
(defun my-scratch-init ()
(with-current-buffer "*scratch*"
(setq-local company-backends (let ((place (assoc 'company-tabnine
company-backends)))
(setf place (remove 'company-ispell place))))
))
HZ
next prev parent reply other threads:[~2021-10-26 6:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 2:05 Add/remove an element into/from a cons Hongyi Zhao
2021-10-26 4:57 ` Tassilo Horn
2021-10-26 5:40 ` Hongyi Zhao
2021-10-26 5:42 ` Hongyi Zhao
2021-10-26 6:07 ` Hongyi Zhao [this message]
2021-10-26 6:18 ` Tassilo Horn
2021-10-26 6:30 ` Hongyi Zhao
2021-10-26 6:39 ` Hongyi Zhao
2021-10-26 6:08 ` Tassilo Horn
2021-10-26 6:17 ` Hongyi Zhao
2021-10-26 6:22 ` Tassilo Horn
2021-10-26 8:12 ` Hongyi Zhao
2021-10-26 8:15 ` Tassilo Horn
2021-10-26 9:26 ` Hongyi Zhao
2021-10-26 9:31 ` Hongyi Zhao
2021-10-26 18:56 ` Tassilo Horn
2021-10-27 1:39 ` Hongyi Zhao
2021-10-27 4:54 ` Hongyi Zhao
2021-10-27 5:13 ` Hongyi Zhao
2021-10-27 18:43 ` Tassilo Horn
2021-10-28 4:14 ` Hongyi Zhao
2021-10-28 4:36 ` Hongyi Zhao
2021-10-28 5:40 ` Hongyi Zhao
2021-10-26 12:36 ` Stefan Monnier
2021-10-26 13:41 ` Hongyi Zhao
2021-10-26 6:22 ` Hongyi Zhao
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