[Anthill-pro] Complex reporting system

[Uldis Karlovs-Karlovskis]

Hello!

I need to create specific system which filters build reports to send or not
to send out to anthill users.

There must be algorithm when build is failed the mail sends out to clients.
All other builds after then must NOT be sent out until first successful
which is sent out. And again no build must be sent out until next failed
build. 
So it`s something like:
If(build_state != previos_build_state) trigger_event;

I know that this must be done in Event Selectors but I don`t know how! Can
You offer some script or solution?

Uldis Karlovs-Karlovskis, C. T. Co
uldis.karlovs-karlovskis at ctco.lv