Re: What is the replacement for the 'stop_run' callback?

[Tad Ashlock <tad.ashlock@gmail.com>]

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On Sun, Oct 17, 2010 at 10:24, Hans Hagen <pragma@wxs.nl> wrote:

> On 17-10-2010 4:06, Tad Ashlock wrote:
>
>  I'm trying to update a ConTeXt module of mine.  It does some data
>> gathering
>> during the ConTeXt run, and then processes it after the run is complete.
>>  This used to work last year:
>>
>> local id, err = callback.register('stop_run', new_stop_run_function)
>>
>> But now err is set to "callback 'stop_run' is frozen (actions performed at
>> the end of a run)".
>>
>
> indeed
>
>
>  After trying various approaches for a couple of hours, I'm calling for
>> help.
>> :)
>>
>
>  Here's what I ended up with:
>>
>> \startluacode
>> print('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% TEST1')
>> local function after_run (head, groupcode)
>>     print('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% TEST2')
>>     return head, true
>> end
>> nodes.tasks.appendaction('finalizers','after','after_run')
>> \stopluacode
>> \starttext
>> \input knuth
>> \stoptext
>>
>> In the output, I see the TEST1 line, but not the TEST2 line.
>>
>
> because after_run is not seen,
>
> function myprivatenamespace.after_run ...
>
>
> nodes.tasks.appendaction('finalizers','after','myprivatenamespace.after_run')
>
>
>  I don't know what "head" and "groupcode" are, but those seem to be the
>> expected parameters for an action.  I don't know why it returns "head,
>> true", but that was recommended in a posting (
>> http://archive.contextgarden.net/message/20100410.005025.76ac9efd.en.html
>> ).
>>
>
> whatever, it's not the place to hook in your finalizer as there finalizers
> are just a specific place in node list processing
>
>
>  I have no idea if 'finalizers' is the right parameter, but I didn't see
>> any
>> others that looked like it could be synonymous with 'stop_run'.
>>
>
> You can use (preferable no messages there):
>
>  luatex.registerstopactions(yourfunction)
>
> or for messages:
>
>  statistics.register("banner",function() return "text" end)
>
> in this case returning false (or nil) will not show the statistic which
> makes sense if there's nothing useful to report.
>
> At some point there will be a formal description for this.
>
> Hans
>
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
>

Hans,

The registerstopactions() function was the solution I was looking for, but
I've verified that both of the solutions work as expected.  I tested them
with both a single ConTeXt source file and a set of files in a Project ->
Product -> Component structure.

I'll wiki this soon.

Thanks,
Tad

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