Getting adjacent units

[AW Arcaeca]

Basically for a UU I just need help with this part: How do you find all adjacent units, and how do you select a specific unit out of them?

The idea here is I'm looking for a way to make a UU receive a bonus if adjacent to cavalry (or anything else that is UNITCOMBAT_MOUNTED), sort of like the discipline promotion. But I can't find any lua functions for getting adjacent units except Unit.IsFriendlyAdjacentUnit, but that doesn't seem like exactly what I need...

Anyway, trying to use that function, I wrote up this code, but something tells me it won't work :

function ThisCivUUBonusAdjacentCavalry(playerID)
	local pPlayer = Players[playerID]
	for pUnit in pPlayer:GetUnits() do
		local mUnit = pPlayer:GetUnits()
		if pUnit:IsFriendlyAdjacentUnit([mUnit:GetUnitCombatType() == GameInfoTypes.UNITCOMBAT_MOUNTED]) then
			pUnit:SetHasPromotion(GameInfoTypes.PROMOTION_THIS_PROMOTION, true)
		else
			pUnit:SetHasPromotion(GameInfoTypes.PROMOTION_THIS_PROMOTION, false)
		end
	end
end
GameEvents.PlayerDoTurn.Add(ThisCivUUBonusAdjacentCavalry)

I don't think it'll work because
1) assigning 2 variables to pPlayer:GetUnits() - does that even work?
2)Probably not the right function anyway, and
3) It doesn't even look like it's structured right.
But, you know, what do you more experienced coders think?

 

[LastSword]

With PlayerDoTurn, you will achieve that units starting turn next to mounted units will have combat bonus.

	for pUnit in pPlayer:GetUnits() do
		if pUnit:IsCombat() then
			pUnit:SetHasPromotion(GameInfoTypes.PROMOTION_THIS_PROMOTION, false)
			for iUnit in pPlayer:GetUnits() do
				if iUnit ~= pUnit then
					if iUnit:GetUnitCombatType() == GameInfoTypes.UNITCOMBAT_MOUNTED then
						if Map.PlotDistance(pUnit:GetX(), pUnit:GetY(), iUnit:GetX(), iUnit:GetY()) == 1 then
						pUnit:SetHasPromotion(GameInfoTypes.PROMOTION_THIS_PROMOTION, true)
break;
						end
					end
				end
			end
		end
	end