controlling the line length of programlisting

Has anyone tried to use schematron to
enforce the line length of programlisting?

We want to be able to limit the line-length
of our programlistings when we are authoring.

That is, we need to be informed when
a line length in a programlisting exceeds a number of characters (e.g.,
72)

so that we can go in and format the
lines properly. E.g., I'm imagining that this would involve counting the
number of characters before a eol and then comparing

this number against the character limit
(72).

If anyone has an alternative suggestion,
that would be greatly appreciated. 

Thank you,

Kate

Subject: Re: [docbook] prettyprinting code snippets

From: Hannes Magnusson <>

To: DavePawson <>

Date: Sun, 14 Jun 2009 12:59:31 +0200

On Fri, Jun 12, 2009 at 19:01, DavePawson<>
wrote:

> Mauricio Tavares wrote:

>>

>>    I am writing a an article in which I am including
quite a few xml

>> examples and snippets. I have been using <programlisting>
but was now

>> wondering if there is a way I can prettyprint those snippets.
Anyone?

>

>

> ONly if the code is well laid out in the first place?

> I try to break lines at <= 70 chars to make sure

> it fits on a screen.

>

> If you want code highlighting etc.. sorry no.

When the PHP documentations where using DocBook-XSL we used to add a

customization layer to add special "tags" around <programlisting>,
and

then post process the output to syntax highlight and format examples

(php, xml, ..).

For example with <programlisting role="php"><?php..

?></programlisting> the customization layer would generate

"<phpcode><?php.. ?></phpcode>" that was then
post processed with

other applications.

Currently we are using "PhD" (PHP based Docbook Renderer) which

handles all these kinds of things :)

-Hannes