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Re: Explanation Request for the Function set-transient-map in subr.el
From: |
Michael Heerdegen |
Subject: |
Re: Explanation Request for the Function set-transient-map in subr.el |
Date: |
Sun, 28 Nov 2021 20:17:24 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
xenodasein--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:
> Thanks for your clarification on isearch issue.
>
> >> ((eq t keep-pred)
> >> (let ((mc (lookup-key map (this-command-keys-vector))))
> >> ;; If the key is unbound `this-command` is
> >> ;; nil and so is `mc`.
> >> (and mc (eq this-command mc))))
> >>
>
> I'm still not clear why exactly this expression is used though: (eq
> this-command mc).
As Stefan and the comment tried to describe: this checks whether the
execution of current command happened using a key binding from the
transient MAP.
> What are the possible values of mc here on the last line?
This test is done to fullfill this part of the docstring:
| [...] if the optional argument KEEP-PRED is t, MAP stays active if a
| key from MAP is used
If this is the case, it's as you described, and the test succeeds. But
when the current command has not been invoked using a binding in the
transient map, mc is `nil' and the `eq'ality test fails as we want to
disable the transient map.
Michael.
- Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/11
- Re: Explanation Request for the Function set-transient-map in subr.el, Stefan Monnier, 2021/11/12
- FWD: Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/14
- Re: FWD: Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/14
- Re: Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/28
- Re: Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/28
- Re: Explanation Request for the Function set-transient-map in subr.el, xenodasein, 2021/11/28
- Re: Explanation Request for the Function set-transient-map in subr.el, Michael Heerdegen, 2021/11/29