Hello Keith and Luigi,

On 06 Nov 2014, at 17:57, Keith J. Schultz <keithjschu...@web.de> wrote:

> Hi Pierre,
> I think you are approaching your problem from the wrong direction!
> The way I understand your problem is that you have certain criteria in your 
> slides
> when encountered decides whether it should be output or not.
> If this is the case then what you have is a classical parsing problem.
> That is you start parsing the content of the slide, until you find the 
> criteria
> that excludes it or come to the end of the slide.
> If you find the criteria then you just continue reading to the end of the 
> slide and not output it,
> otherwise send the gathered content to be output.
Yes, beautifully expressed.

> That would be the most elegant way and can be used for dynamic content.
Yes, but my current solution brakes on crossing the path of C code : I use 
\gobbleinput that is defined as (according to some documentation) :
As I understand this code, the "goblling" is made as enclosing the text that 
you dan't want to be added to the output as the body of a function.
If the text contains some restricted characters as the "%", this proposition 
> Now, If you already know if the level is know a head of time the slides can 
> be given a level and you can use
> a custom mode that only outputs the slides to this level.
This is what I've made : I express a list of numbered slides and check if each 
slide has to be outputted or not into the final document.

> Another way is to build a database or table which is processed from which to 
> choose your slides!
This is the path I've followed so far with success for some of my lectures.
But, when I've applied the same process to slides containing C code, this 
process brakes.

I've tried yesterday evening to modify my slide definition to use the solution 
provided by Luigi, but I've failed.

> Or define a start/stop command that has a user level parameter and use mode 
> to decide output or not!
> this approach should not interfere with other macros you are using.
How do you make this ?

Please save my remaining hairs on my head !
> Hope this helps
> regards
>       Keith.
Thank you very much for sparing some time to express so efficiently my problem.

best regards,
Bonnefoi Pierre-Francois                |    E-mail : bonne...@unilim.fr 
Universite de Limoges, Laboratoire XLIM |       Tel : 06 28 18 03 38
123 av Albert Thomas                    |  Mrs. Peel, we're needed...
87060 Limoges CEDEX - FRANCE            |                 The Avengers.

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