WoW API: UnitCastingInfo

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Returns information on the spell currently cast by the specified unit. Returns nil if no spell is being cast.

spell, rank, displayName, icon, startTime, endTime, isTradeSkill = UnitCastingInfo("unit")

Parameters

Arguments

unit

String - The UnitId to query (e.g. "player", "party2", "pet", "target" etc.)

Returns

spell

String - The name of the spell, or nil if no spell is being cast.

rank

String - The string describing the rank of the spell, e.g. "Rank 1".

displayName

String - The name to be displayed.

icon

String - The texture path associated with the spell.

startTime

Number - Specifies when casting has begun, in milliseconds.

endTime

Number - Specifies when casting will end, in milliseconds.

isTradeSkill

Boolean - Specifies if the cast is a tradeskill

Example

local spell, _, _, _, _, endTime = UnitCastingInfo("player")
if spell then 
 local finish = endTime/1000 - GetTime()
 ChatFrame1:AddMessage(spell .. ' will be finished casting in ' .. finish .. ' seconds.')
end

Result

If you're currently casting Shadowbolt:

Shadowbolt will be finished casting in 1.234 seconds.

Details

For channeled spells, displayName is "Channeling".

Not sure if displayName ever differs from spell in any other contexts.