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Re: `add-face'

From: Lars Magne Ingebrigtsen
Subject: Re: `add-face'
Date: Wed, 24 Oct 2012 20:54:36 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2.50 (gnu/linux)

Chong Yidong <address@hidden> writes:

>> + If NOREPLACE, add the text properties instead of replacing any
>> + existing ones.  This is mainly useful for faces.


> This is too vague.  What does "add the text properties" mean?  If the
> current value of a property is nil, and the argument to
> add-text-properties specifies a value `foo', does the new value become
> `foo' or `(foo)'?

The former, but it probably doesn't matter?

> If the current value is `1', does the new value become `(foo 1)' or
> something else?

`(foo 1)' is, I think, the only reasonable way to interpret "add".

> And, specifically for face properties, what if the current value is a
> list specifying an anonymous face, like `(:foreground "black")'?

Oh, it doesn't.  Hm.  That's a problem...  is there any reliable way to
distinguish `(:foreground "black")' from `(bold italic)'?

(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/

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