Re: event trigger API documentation?

On Thu, 2013-04-18 at 17:31 +0200, Dimitri Fontaine wrote:
>   - what about support for PLs other than C and PLpgSQL?
> 
>     It used to be part of the patch, and I don't understand well
> enough
>     the development calendar to guess if I'm supposed to extract that
>     from earlier patch or if that's too late for 9.3. I'm not sure
>     what Peter's idea are wrt to the calendar here. 

I added event trigger support to PL/sh, just for some additional
validation:

https://github.com/petere/plsh/tree/event-triggers

It seems pretty straightforward and useful, so I'm not sure where your
hesitation is coming from.

Based in this, I could add some documentation in the coming weeks.

I don't think we have time to add support for this to the in-tree PLs.
But I was thinking we should at least check all PLs out there that they
don't crash if they are presented with an event trigger function,
because if you code a PL like this:

if (CALLED_AS_TRIGGER(fcinfo) {   // it's a trigger
}
else {   // it's a normal call
}

there might be some trouble.