Re: Bug with linenumbering

[Aditya Mahajan <adityam@umich.edu>]

On Wed, 2 May 2012, Hans Hagen wrote:

> On 1-5-2012 21:43, Aditya Mahajan wrote:
>> Hi,
>> 
>> Line numbering does not respect the parameters given with
>> \startlinenumbering. For example:
>
> Line numbering is a delayed operation. As they are handled when the page is 
> constructed the settings of that moment apply. In practice only the start key 
> is handled when you pass settings to \start.... (the only reason for  having 
> the second argument is number start/restart etc). If you want different 
> renderings, the best is to define a specific instance of line numbering.

A little background: In the initial version of the vim module, I used to 
do line numbering manually (each line started with \NL macro, which 
expanded to a number in an appropriate style depending on whether line 
numbering was enabled or not. When I rewrote the module to use the filter 
module, I also rewrote the line numbering mechanism to use ConTeXt's 
inbuilt line numbering macros, but I cannot get them to work.

Consider the following example. I want to define an environment, which, 
amongst other things does line numbering. I want the user to control the 
style and color of line numbering, so I define keys numberstyle and 
numbercolor, which are then passed on to the line numbering macros. The 
most obvious implementation of this does not work.

\definenamespace
     [whatever]
     [
       type=module,
       name=whatever,
       command=yes,
       setup=yes,
       parent=whatever,
     ]

\appendtoks
     \definelinenumbering
           [\currentwhatever]
           [
             color=\whateverparameter{numbercolor},
             style=\whateverparameter{numberstyle},
           ]%
     \setvalue{start\currentwhatever}{\dostartwhatever[\currentwhatever]}%
     \setvalue{stop\currentwhatever}{\dostopwhatever}%
\to\everydefinewhatever

% For illustration. The actual macro is more complicated.
\def\dostartwhatever[#1]%
     {\startlinenumbering[#1]}

\def\dostopwhatever
     {\stoplinenumbering}

%%%%

\definewhatever[testing][numbercolor=red,numberstyle=bold]

\starttext
\starttesting
   \input knuth
\stoptesting
\stoptext

When I run it, the line number is not styled. Any idea on what I can do 
differently?

Aditya

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