From: Michael Heerdegen <michael_heerdegen@web.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Explanation Request for the Function set-transient-map in subr.el
Date: Sun, 28 Nov 2021 20:17:24 +0100 [thread overview]
Message-ID: <87lf18nl8b.fsf@web.de> (raw)
In-Reply-To: Mpbj_Pk--3-2@tutanota.de
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.
next prev parent reply other threads:[~2021-11-28 19:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-11 18:10 Explanation Request for the Function set-transient-map in subr.el xenodasein--- via Users list for the GNU Emacs text editor
2021-11-12 14:41 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-14 12:08 ` FWD: " xenodasein--- via Users list for the GNU Emacs text editor
2021-11-14 13:04 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-14 23:13 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-28 18:12 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 19:17 ` Michael Heerdegen [this message]
2021-11-28 19:45 ` Stefan Monnier
2021-11-28 20:48 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 21:07 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-28 21:24 ` Michael Heerdegen
2021-11-28 22:29 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 22:44 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-29 10:28 ` Michael Heerdegen
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