[syslog-ng] merging stuff from merge-queue/3.4

[Gergely Nagy]

Balazs Scheidler <bazsi77 at gmail.com> writes:

>> > dbparser: Make the context length available to action conditions
>> > 
>> > I didn't pick this one. I was thinking about using a template
>> > function to return the number of entries in the current context.
>> 
>> Indeed, using a template function crossed my mind too, but to do that,
>> I would have to do a dance I deemed too expensive, both by the amount
>> of code that would need to be written and the number of hoops the
>> template function would have to jump through: it would need to be
>> called first, then look up the context, then append the string to the
>> result.. That seemed overly complicated to me, compared to the few
>> lines the patch adds.
>
> You don't have to look up anything, the context is passed to template
> functions through the invoke args stuff. There are already template
> functions that use the context, see for instance $(grep)

I've implemented $(context-length) now, it's pushed to the
merge-queue/3.4 branch. It was easier than I thought, and more
straightforward than the previous $CONTEXT_LENGTH thing, too.

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