Re: Marginal line numbers

[Jon Crump <jjcrump@uw.edu>]

Thomas, et alia.

Thanks so very much! I now have this:

\startluacode
 function filter(s)
   if math.mod(s,5) == 0 then
     context.color( { "darkred" }, s )
   end
 end
\stopluacode

\define[1]\MyNumber%
 {\ctxlua{filter(#1)}\endgraf}

\startxmlsetups xml:lb
	\lineNumbers{\MyNumber{\xmlatt{#1}{n}}}
	\xmlflush{#1}
\stopxmlsetups

\defineinmargin [lineNumbers] [outer] [normal]

This gets me what I wanted.  Still fumbling greatly with the macro
syntax. I'm not sure what the recursion is for, for example. On the
other hand the lua seems rather straightforward to me by comparison. I
tried returning an empty string like this: context.color( {"blue"}, ''
) to remove the other numbers, but that seemed silly, so I just
removed the 'else' clause instead, and that seemed to work as well.

In python-speak I'd interpret context.color() as a method call on a
module 'context'. Could you, or anyone, direct me to any documentation
for this module and a list of the properties and methods that it
supports?

On Wed, Dec 15, 2010 at 11:34 PM, Thomas A. Schmitz
<thomas.schmitz@uni-bonn.de> wrote:

> This is easy with a lua function. Since you know python, I guess the following example will be easy for you:
>
> \startluacode
>  function filter(s)
>    if math.mod(s,5) == 0 then
>      context.color( { "darkred" }, s )
>    else
>      context.color( { "darkblue" }, s )
>    end
>  end
> \stopluacode
>
> \define[1]\MyNumber%
>  {\ctxlua{filter(#1)}\endgraf}
>
> \starttext
>
> \dorecurse{25}{\MyNumber{\recurselevel}}
>
> \stoptext
>
> This should get you going, I hope
>
> Good luck
>
> Thomas
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