From: Hans Hagen <pragma@wxs.nl>
To: Mojca Miklavec <mojca.miklavec.lists@gmail.com>
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: How do I test for empty labeltext?
Date: Tue, 25 Oct 2011 12:14:45 +0200 [thread overview]
Message-ID: <4EA68C15.4030709@wxs.nl> (raw)
In-Reply-To: <CALBOmsY+X6hCCzvLk6gv8e1cZ3R91mVoQbQRYQSL7PE9-HQfLA@mail.gmail.com>
On 25-10-2011 11:26, Mojca Miklavec wrote:
> On Mon, Oct 24, 2011 at 20:41, Hans Hagen<pragma@wxs.nl> wrote:
>> On 24-10-2011 19:41, Mojca Miklavec wrote:
>>>
>>> Hello,
>>>
>>> The following code
>>>
>>> \setuplabeltext[test=]
>>> test is \doifemptyelse{\labeltext{test}}{empty}{not empty}
>>>
>>> doesn't work as intended for the reasons that I approximately
>>> understand (not exactly, but I understand that there might be a lot of
>>> weird stuff returned when I ask for labeltext). However I have no idea
>>> how to check if text is empty or not.
>>>
>>> As an exception :) :) :), MKIV hints should be highly appreciated and
>>> enough for this particular application.
>>
>> an empty test is always somewhat special as there can be an unexpandable
>> macro inside that eventually expands to nothing
>>
>> you can try \doiftextelse instead
>
> Thank you very much. This works fine.
>
> This should probably be added to
> http://wiki.contextgarden.net/System_Macros/Branches_and_Decisions
> at least (possibly to reference next to labels as well), but I'm not
> sure how to describe it.
"If you want to know if some macro provides some typeset content you can
use the following helper macro:" ...
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next prev parent reply other threads:[~2011-10-25 10:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-24 17:41 Mojca Miklavec
2011-10-24 18:41 ` Hans Hagen
2011-10-25 9:26 ` Mojca Miklavec
2011-10-25 10:14 ` Hans Hagen [this message]
2011-10-25 16:36 ` Aditya Mahajan
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