* setupinteraction and macroexpansion
@ 2012-06-19 8:39 Andreas Schneider
2012-06-19 8:42 ` Wolfgang Schuster
0 siblings, 1 reply; 4+ messages in thread
From: Andreas Schneider @ 2012-06-19 8:39 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Hello,
I'm a bit lost with macro expansion here. I try to use some macros to
set the title (and subject) of the PDF document. The attached minimal
example shows what I want to achieve.
I tried def, edef, gdef, define, explicit expand, expandoneafter, etc.
etc. without any success. Whatever I do, the title field in the PDF
metadata always contains the raw "\date..." command instead of the
formatted date.
Any suggestions?
--
Best Regards,
Andreas
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\edef\mytitle{Some date: \date[y=2012,m=6,d=19]}
\setupinteraction[title=\mytitle]
\starttext
\subject\mytitle
Hello World
\stoptext
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* Re: setupinteraction and macroexpansion
2012-06-19 8:39 setupinteraction and macroexpansion Andreas Schneider
@ 2012-06-19 8:42 ` Wolfgang Schuster
2012-06-19 8:59 ` Andreas Schneider
0 siblings, 1 reply; 4+ messages in thread
From: Wolfgang Schuster @ 2012-06-19 8:42 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 19.06.2012 um 10:39 schrieb Andreas Schneider:
> Hello,
>
> I'm a bit lost with macro expansion here. I try to use some macros to
> set the title (and subject) of the PDF document. The attached minimal
> example shows what I want to achieve.
>
> I tried def, edef, gdef, define, explicit expand, expandoneafter, etc.
> etc. without any success. Whatever I do, the title field in the PDF
> metadata always contains the raw "\date..." command instead of the
> formatted date.
>
> Any suggestions?
You can’t use \date (or any other unexpandable command) in an expandable context.
Wolfgang
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: setupinteraction and macroexpansion
2012-06-19 8:42 ` Wolfgang Schuster
@ 2012-06-19 8:59 ` Andreas Schneider
2012-06-19 9:08 ` Wolfgang Schuster
0 siblings, 1 reply; 4+ messages in thread
From: Andreas Schneider @ 2012-06-19 8:59 UTC (permalink / raw)
To: mailing list for ConTeXt users
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On Tuesday, June 19, 2012, at 10:42 Wolfgang Schuster wrote:
> Am 19.06.2012 um 10:39 schrieb Andreas Schneider:
>> Hello,
>>
>> I'm a bit lost with macro expansion here. I try to use some macros to
>> set the title (and subject) of the PDF document. The attached minimal
>> example shows what I want to achieve.
>>
>> I tried def, edef, gdef, define, explicit expand, expandoneafter, etc.
>> etc. without any success. Whatever I do, the title field in the PDF
>> metadata always contains the raw "\date..." command instead of the
>> formatted date.
>>
>> Any suggestions?
> You can’t use \date (or any other unexpandable command) in an expandable context.
> Wolfgang
Hmm I see, so \date is simply not possible for that case. Ok, thanks
for explaining that I wasn't aware (until now) that commands can be
unexpandable.
Thanks again! :-)
--
Best Regards,
Andreas
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[-- Attachment #2: Type: text/plain, Size: 485 bytes --]
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: setupinteraction and macroexpansion
2012-06-19 8:59 ` Andreas Schneider
@ 2012-06-19 9:08 ` Wolfgang Schuster
0 siblings, 0 replies; 4+ messages in thread
From: Wolfgang Schuster @ 2012-06-19 9:08 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 19.06.2012 um 10:59 schrieb Andreas Schneider:
> On Tuesday, June 19, 2012, at 10:42 Wolfgang Schuster wrote:
>
>> Am 19.06.2012 um 10:39 schrieb Andreas Schneider:
>
>>> Hello,
>>>
>>> I'm a bit lost with macro expansion here. I try to use some macros to
>>> set the title (and subject) of the PDF document. The attached minimal
>>> example shows what I want to achieve.
>>>
>>> I tried def, edef, gdef, define, explicit expand, expandoneafter, etc.
>>> etc. without any success. Whatever I do, the title field in the PDF
>>> metadata always contains the raw "\date..." command instead of the
>>> formatted date.
>>>
>>> Any suggestions?
>
>> You can’t use \date (or any other unexpandable command) in an expandable context.
>
>> Wolfgang
>
> Hmm I see, so \date is simply not possible for that case. Ok, thanks
> for explaining that I wasn't aware (until now) that commands can be
> unexpandable.
To explain it in a simple way: Commands which can be used in \edef\comecommand{…}
are expandable and commands which fail in \edef are unexpandable. It’s also important
to know that commands with optional arguments are always unexpandable because
the underlying mechanism to check for the optional bracket, brace etc. can’t be used
in \edef, you can also make a expandable command (e.g. \def\foo{FOO}) unexpandable
by adding \unexpanded in front of the \def (e.g. \unexpanded\def\bar{BAR}).
Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2012-06-19 8:42 ` Wolfgang Schuster
2012-06-19 8:59 ` Andreas Schneider
2012-06-19 9:08 ` Wolfgang Schuster
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