* 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
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* 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
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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
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* Re: How to avoid overriding a control sequence?
2016-03-07 18:47 ` luigi scarso
@ 2016-03-07 19:02 ` Nicola
0 siblings, 0 replies; 5+ messages in thread
From: Nicola @ 2016-03-07 19:02 UTC (permalink / raw)
To: ntg-context
On 2016-03-07 18:47:20 +0000, luigi scarso said:
> 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
> ?
That works, thanks!
Nicola
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* 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
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* 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
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
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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
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