Re: Skipping item numbers in an itemized list?

[Aditya Mahajan <adityam@umich.edu>]

On Wed, 27 Apr 2011, Ulrike Fischer wrote:

> Am Wed, 27 Apr 2011 16:19:45 +0200 schrieb Wolfgang Schuster:
>
>> Am 27.04.2011 um 15:53 schrieb Alasdair McAndrew:
>>
>>> Hello,
>>>
>>> The effect I want is something like:
>>>
>>> 1. First item
>>> 2. Second item
>>> 5. Fifth item
>>> 6. Sixth item
>>> 8. Eight item
>
>>> and so on.  Every now and then I need to skip a number or two.
>>> In LaTeX I could do this with \addtocounter{enumi}{2} - but how
>>> is this done in ConTeXt?
>
>> \starttext
>>
>> \startitemize
>> \sym{1.} First item
>> \sym{2.} Second item
>> \sym{5.} Fifth item
>> \sym{6.} Sixth item
>> \sym{8.} Eight item
>> \stopitemize
>>
>> \stoptext
>
> You can't be serious ;-). Do you really think one should enter all
> numbers manually only because someone wants to skip e.g. the number
> "13"?

You can't be serious ;) Do you really think that one should manually 
increment a counter. What's next: using {\bfa Some title} for section 
titles?

More seriously, if there is a logic behind such a counter, then you can 
use:

\defineconversion[fancy][1,2,5,6,8]
% or a TeX or Lua command that generates the count

\startitemize[fancy] ....

>  There must be a counter around and a way to advance it.

If you insist,

\setstructurecounter[\currentitemgroupcounter]{5}

There is no interface to increment the counter by arbitrary amount, but 
you can define your own interface to structures.counters.add:

\unprotected
\def\addtostructurecounter  [#1]#2{\ctxlua{structures.counters.add 
("\@@thestructurecounter{#1}",1,#2)}}

and then use

   \addtostructurecounter[\currentitemgroupcounter]{2}

Aditya
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