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

[Hans Hagen <pragma@wxs.nl>]

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

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