* How to avoid overriding a control sequence?
@ 2016-03-07 18:40 Nicola
2016-03-07 18:47 ` luigi scarso
2016-03-07 20:16 ` Hans Hagen
0 siblings, 2 replies; 5+ messages in thread
From: Nicola @ 2016-03-07 18:40 UTC (permalink / raw)
To: ntg-context
How do I check in ConTeXt whether a control sequence is already
defined (to avoid redefining it by accident)?
Marginally related to the above, I have tried to use \show, only to
discover, to my surprise, that it gives an error. For example:
\show\NL
\end
Does ConTeXt override some of TeX primitives?
Nicola
___________________________________________________________________________________
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] 5+ messages in thread
* Re: How to avoid overriding a control sequence?
2016-03-07 18:40 How to avoid overriding a control sequence? Nicola
@ 2016-03-07 18:47 ` luigi scarso
2016-03-07 19:02 ` Nicola
2016-03-07 20:16 ` Hans Hagen
1 sibling, 1 reply; 5+ messages in thread
From: luigi scarso @ 2016-03-07 18:47 UTC (permalink / raw)
To: mailing list for ConTeXt users
[-- Attachment #1.1: Type: text/plain, Size: 289 bytes --]
On Mon, Mar 7, 2016 at 7:40 PM, Nicola <nvitacolonna@gmail.com> wrote:
> How do I check in ConTeXt whether a control sequence is already
> defined (to avoid redefining it by accident)?
>
>
kind of
\ifdefined\writebanner \else \unexpanded\def\writebanner{\writestring}
\fi
?
--
luigi
[-- Attachment #1.2: Type: text/html, Size: 811 bytes --]
[-- 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] 5+ messages in thread* Re: How to avoid overriding a control sequence?
2016-03-07 18:40 How to avoid overriding a control sequence? Nicola
2016-03-07 18:47 ` luigi scarso
@ 2016-03-07 20:16 ` Hans Hagen
2016-03-07 20:30 ` Nicola
1 sibling, 1 reply; 5+ messages in thread
From: Hans Hagen @ 2016-03-07 20:16 UTC (permalink / raw)
To: ntg-context
On 3/7/2016 7:40 PM, Nicola wrote:
> How do I check in ConTeXt whether a control sequence is already
> defined (to avoid redefining it by accident)?
>
> Marginally related to the above, I have tried to use \show, only to
> discover, to my surprise, that it gives an error. For example:
>
> \show\NL
> \end
>
> Does ConTeXt override some of TeX primitives?
yes, like \month ... but in general if you use uppercase or camelcase
you're quite safe (there are some math symbols with uppercase but if you
define your own commands you will probably not use those) ... mechanisms
like tables that use \NC and so define them local
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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] 5+ messages in thread* Re: How to avoid overriding a control sequence?
2016-03-07 20:16 ` Hans Hagen
@ 2016-03-07 20:30 ` Nicola
0 siblings, 0 replies; 5+ messages in thread
From: Nicola @ 2016-03-07 20:30 UTC (permalink / raw)
To: ntg-context
On 2016-03-07 20:16:45 +0000, Hans Hagen said:
> On 3/7/2016 7:40 PM, Nicola wrote:
>> How do I check in ConTeXt whether a control sequence is already
>> defined (to avoid redefining it by accident)?
>>
>> Marginally related to the above, I have tried to use \show, only to
>> discover, to my surprise, that it gives an error. For example:
>>
>> \show\NL
>> \end
>>
>> Does ConTeXt override some of TeX primitives?
>
> yes, like \month ... but in general if you use uppercase or camelcase
> you're quite safe (there are some math symbols with uppercase but if you
> define your own commands you will probably not use those) ... mechanisms
> like tables that use \NC and so define them local
I see. Local commands are a good idea. I usually use camelcase, but
since I wanted to define some two-letter sequences, I thought I'd
better be cautious.
Nicola
___________________________________________________________________________________
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] 5+ messages in thread
end of thread, other threads:[~2016-03-07 20:30 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-03-07 18:40 How to avoid overriding a control sequence? Nicola
2016-03-07 18:47 ` luigi scarso
2016-03-07 19:02 ` Nicola
2016-03-07 20:16 ` Hans Hagen
2016-03-07 20:30 ` Nicola
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).