Assist Macro...

[Lost Ninja]

Want:

attack current target.
if no current target assist focus
if focus has no target assist pet
if pet has no target do nothing

Is such a thing possible if so how?

[opt]

why not just use /cast [target=focustarget] spell ?
Aslong as your focus has a target it wont fail.
I do believe you could make that macro but my skillz arent deep enough

[Lost Ninja]

Currently I do, well something similar, but I need a bit more functionality from it.

[StrikeQ]

/cast [target=target, exists, nodead, harm] Fireball
/stopmacro [target=target, exists, nodead, harm]
/cast [target=focustarget, exists, nodead, harm] Fireball
/stopmacro [target=focustarget, exists, nodead, harm]
/cast [target=pettarget, exists, nodead, harm] Fireball

That's off top of my head, and untested.