From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Re: Difficulties with `purecopy' discarding text properties from strings
Date: Fri, 19 May 2017 15:22:50 -0400 [thread overview]
Message-ID: <jwvo9uohczs.fsf-monnier+gmane.emacs.devel@gnu.org> (raw)
In-Reply-To: 20170519185508.GA5330@acm.fritz.box
> Presumably there are good reasons for discarding text properties when
> purecopying strings.
I don't think so.
> Or, maybe, there was just no particular reason to amend the workings
> of `purecopy' when text properties came into existence.
I think that's what happens.
But wait a minute:
> I naively constructed such a defcustom, with text properties on the
> value option strings.
How exactly did you do that? Using #("..." ...)
or using (propertize "..." ...)?
> After some debugging, I discover that defcustom strips those text
> properties off the strings. It does this by using `purecopy' on these
> strings (in the function `custom-declare-variable').
But AFAICT custom-declare-variable only applies purecopy to its
`default` argument which is supposed to be an expression (which
evaluates to the intended value) rather than a value. So if you use the
(propertize "..." ...) form, the properties should not be stripped.
Or am I missing something?
Stefan
next prev parent reply other threads:[~2017-05-19 19:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-19 18:55 Difficulties with `purecopy' discarding text properties from strings Alan Mackenzie
2017-05-19 19:11 ` Daniel Colascione
2017-05-19 20:04 ` Alan Mackenzie
2017-05-19 19:22 ` Stefan Monnier [this message]
2017-05-19 19:54 ` Alan Mackenzie
2017-05-19 21:04 ` Eli Zaretskii
2017-05-20 10:29 ` Alan Mackenzie
2017-05-20 2:58 ` Stefan Monnier
2017-05-20 10:40 ` Alan Mackenzie
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