Re: [NTG-context] How to avoid overriding a control sequence?

2016-03-07 Thread Nicola 

On 2016-03-07 20:16:45 +, 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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Re: [NTG-context] How to avoid overriding a control sequence?

2016-03-07 Thread Hans Hagen 

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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  tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
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Re: [NTG-context] How to avoid overriding a control sequence?

2016-03-07 Thread Nicola 

On 2016-03-07 18:47:20 +, luigi scarso said:


On Mon, Mar 7, 2016 at 7:40 PM, Nicola  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: [NTG-context] How to avoid overriding a control sequence?

2016-03-07 Thread luigi scarso 
On Mon, Mar 7, 2016 at 7:40 PM, Nicola  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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