Mouse over macro help

[Dreizehn]

i'm currently using
/cast [target=mouseover] Riptide

which is nice. but i want it so that if i'm not mouse-ing over anything it will just cast on me.
anyone know how to modify this?

[Mordret]

/cast [@mouseover,help,nodead][@player] Riptide

Or with priority mouseover > target > player

/cast [@mouseover,help,nodead][@target,help,nodead][@player] Riptide

[lawomous]

Prioritizes target too but shorter.

#showtooltip
/cast [@mouseover,help,nodead][]Riptide