Macro to announce /w when a stat reaches "x" amount

[Smashysmashy]

Im looking for a macro that i can bind to a generic damage attack (mutilate) so that when a combat rating hits a threshhold - say 100% crit or higher, when the attack is pressed it will /w myself to let me know.

Basically I want to use it to track the proc on http://www.wowhead.com/item=12590/felstriker as it causes no buff.

Im aware of such macro's involving things like GetCombatRatingBonus(6) but which 1 is crit and would it be as simple as combatratingx > 100 then /w PROC?

Thanks in advance for any help.

*Edit*
After Reading around a bit ive got abit of a macro running,

/script local u = (GetCombatRating(CR_CRIT_MELEE)); DEFAULT_CHAT_FRAME:AddMessage("PROC: "..u..".");

I just need to add some sort of "if" and also the combat ratings are strange, probably due to an outdated code from TBC times. CombatRating gives the crit rating value 4-5kish, where as CombatRatingBonus gives the amount of crit I have excluding the base crit, and as Felstriker adds to base rather than crit rating value %, this doesnt tell me a change. :<

[Tehstool]

Im looking for a macro that i can bind to a generic damage attack (mutilate) so that when a combat rating hits a threshhold - say 100% crit or higher, when the attack is pressed it will /w myself to let me know.

Basically I want to use it to track the proc on http://www.wowhead.com/item=12590/felstriker as it causes no buff.

Im aware of such macro's involving things like GetCombatRatingBonus(6) but which 1 is crit and would it be as simple as combatratingx > 100 then /w PROC?

Thanks in advance for any help.

*Edit*
After Reading around a bit ive got abit of a macro running,

/script local u = (GetCombatRating(CR_CRIT_MELEE)); DEFAULT_CHAT_FRAME:AddMessage("PROC: "..u..".");

I just need to add some sort of "if" and also the combat ratings are strange, probably due to an outdated code from TBC times. CombatRating gives the crit rating value 4-5kish, where as CombatRatingBonus gives the amount of crit I have excluding the base crit, and as Felstriker adds to base rather than crit rating value %, this doesnt tell me a change. :<

You could probably set up a weak aura since I believe it shows that you gain the buff in the combat log.

[Smashysmashy]

No there's no buff in combat log or UI. The only thing is that the combat screen scrolling text shows the buff + buff fade, so could possibly track the spell cast?

[sshika]

According to WoWHead it triggers a buff.

Anyway, I don't know if you really get melee crit (don't have the dagger to test it)
If so you may use this:

/run if GetCritChance()>=100 then print("100% crit!") end

[Smashysmashy]

OMG you are awesome, works like a treat <3

[ConcernedCitizen]

OMG you are awesome, works like a treat <3

definite agree, amazing