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Date:         Mon, 29 Sep 2014 15:45:46 -0400
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From: "Allred, Sean" <seallred@SMCM.EDU>
Subject: Re: [l3keys] Suggestion: Add a key property for specifying key that /has/ to be used
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I'll just chime in and say that this topic is *awfully* similar to
http://thread.gmane.org/gmane.comp.tex.latex.latex3/3363.

On Mon, Sep 29, 2014 at 5:37 AM, Denis Bitouz=C3=A9 <
denis.bitouze@lmpa.univ-littoral.fr> wrote:

> Hi,
>
> among others, `.value_forbidden:` and `.value_required:` key properties
> from `l3keys` package are useful: they let us specify that a given key,
> when used, either cannot or must receive a value.
>
> What could be useful as well is a key property, say `.required:`, that
> would
> specify that the corresponding key /has/ to be used. This could be helpfu=
l
> for
> instance in the case of a document command `\MyModuleSetup` for setting u=
p
> a module `mymodule`:
>
>     \DeclareDocumentCommand \MyModuleSetup { m }
>       { \keys_set:nn { mymodule } { #1 } }
>
> where some module property /has/ to be specified.
>
> I know this can be achieved with something like test of existence of
> some tokenlist and message emitted in case of nonexistence but a high
> level key property for this could be nice.
>
> May I ask what is your opinion about that?
>
> Thanks in anticipation.
> --
> Denis
>


--=20
Sean Allred

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<div dir=3D"ltr">I&#39;ll just chime in and say that this topic is *awfully=
* similar to=C2=A0<a href=3D"http://thread.gmane.org/gmane.comp.tex.latex.l=
atex3/3363">http://thread.gmane.org/gmane.comp.tex.latex.latex3/3363</a>.=
=C2=A0</div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mo=
n, Sep 29, 2014 at 5:37 AM, Denis Bitouz=C3=A9 <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:denis.bitouze@lmpa.univ-littoral.fr" target=3D"_blank">denis.bi=
touze@lmpa.univ-littoral.fr</a>&gt;</span> wrote:<br><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">Hi,<br>
<br>
among others, `.value_forbidden:` and `.value_required:` key properties<br>
from `l3keys` package are useful: they let us specify that a given key,<br>
when used, either cannot or must receive a value.<br>
<br>
What could be useful as well is a key property, say `.required:`, that woul=
d<br>
specify that the corresponding key /has/ to be used. This could be helpful =
for<br>
instance in the case of a document command `\MyModuleSetup` for setting up<=
br>
a module `mymodule`:<br>
<br>
=C2=A0 =C2=A0 \DeclareDocumentCommand \MyModuleSetup { m }<br>
=C2=A0 =C2=A0 =C2=A0 { \keys_set:nn { mymodule } { #1 } }<br>
<br>
where some module property /has/ to be specified.<br>
<br>
I know this can be achieved with something like test of existence of<br>
some tokenlist and message emitted in case of nonexistence but a high<br>
level key property for this could be nice.<br>
<br>
May I ask what is your opinion about that?<br>
<br>
Thanks in anticipation.<br>
<span class=3D"HOEnZb"><font color=3D"#888888">--<br>
Denis<br>
</font></span></blockquote></div><br><br clear=3D"all"><div><br></div>-- <b=
r><div dir=3D"ltr">Sean Allred</div>
</div>

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