\setupheadnumber and zero

\setupheadnumber and zero

[Procházka Lukáš Ing. - Pontex s. r. o.]

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Hello,

can a section head be generated with the number 0 (or less)?

Sometimes I need to prepend a section while keeping existing section head numbers...

Example:

----
\starttext
   \setupheadnumber[chapter][-1]
   \chapter{Ch0} % Getting "Ch0" instead of "0. Ch0"?
   \chapter{Ch1}
\stoptext
----

Here, "0. Ch0" is not generated, the zero is not displayed; why?

Best regards,

Lukas


-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz
Bezová 1658
147 14 Praha 4

Tel: +420 241 096 751
Fax: +420 244 461 038

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\starttext
  \setupheadnumber[chapter][-1]
  \chapter{Ch0} % Getting "Ch0" instead of "0. Ch0"?
  \chapter{Ch1}
\stoptext

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Re: \setupheadnumber and zero

[Wolfgang Schuster]

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> Procházka Lukáš Ing. - Pontex s. r. o. <mailto:LPr@pontex.cz>
> 29. August 2015 16:11
> Hello,
>
> can a section head be generated with the number 0 (or less)?
>
> Sometimes I need to prepend a section while keeping existing section 
> head numbers...
>
> Example:
>
> ----
> \starttext
>   \setupheadnumber[chapter][-1]
>   \chapter{Ch0} % Getting "Ch0" instead of "0. Ch0"?
>   \chapter{Ch1}
> \stoptext
> ----
>
> Here, "0. Ch0" is not generated, the zero is not displayed; why?
You can't set a negative number for the start of the counter but you can 
change the appereance.

\defineexpandable[1]\PreviousNumber
   {\number\numexpr#1-1\relax}

\defineconversion[PreviousNumber][\PreviousNumber]

\defineconversionset[zerostart][n,PreviousNumber][n]

\setuphead[chapter,section][sectionconversionset=zerostart]

\starttext
\chapter{First chapter}
\chapter{Second chapter}
\stoptext

Wolfgang

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: \setupheadnumber and zero

[Procházka Lukáš Ing. - Pontex s. r. o.]

... Great, thanks for the answer. Lukas


On Tue, 08 Sep 2015 21:10:51 +0200, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

>> Procházka Lukáš Ing. - Pontex s. r. o. <mailto:LPr@pontex.cz>
>> 29. August 2015 16:11
>> Hello,
>>
>> can a section head be generated with the number 0 (or less)?
>>
>> Sometimes I need to prepend a section while keeping existing section
>> head numbers...
>>
>> Example:
>>
>> ----
>> \starttext
>>   \setupheadnumber[chapter][-1]
>>   \chapter{Ch0} % Getting "Ch0" instead of "0. Ch0"?
>>   \chapter{Ch1}
>> \stoptext
>> ----
>>
>> Here, "0. Ch0" is not generated, the zero is not displayed; why?
> You can't set a negative number for the start of the counter but you can
> change the appereance.
>
> \defineexpandable[1]\PreviousNumber
>    {\number\numexpr#1-1\relax}
>
> \defineconversion[PreviousNumber][\PreviousNumber]
>
> \defineconversionset[zerostart][n,PreviousNumber][n]
>
> \setuphead[chapter,section][sectionconversionset=zerostart]
>
> \starttext
> \chapter{First chapter}
> \chapter{Second chapter}
> \stoptext
>
> Wolfgang
>


-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz
Bezová 1658
147 14 Praha 4

Tel: +420 241 096 751
Fax: +420 244 461 038

___________________________________________________________________________________
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
___________________________________________________________________________________