Add power bars for healers and blood deathknights

src/types/unitframe.lua

@@ -48,7 +48,9 @@ function UnitFrame:Init(unit, width, height, hideInRaid)
     self.hideInRaid = hideInRaid or false
     local secure = self:CreateSecureFrame(width, height)
     secure:Hide()
-    self.hp = StatusBar:new(self, width, height)
+    self.hp = StatusBar:new(self, width, height, 0, true)
+    self.power = StatusBar:new(self, width, 6, 2, false)
+    self.power:Hide()
     self.auras = AuraList:new(self)
     local overlays = CreateFrame("Frame", nil, secure)
     overlays:SetFrameStrata("MEDIUM")
@@ -320,12 +322,59 @@ function UnitFrame:UNIT_NAME_UPDATE()
     self:UpdateName()
 end
 
+function UnitFrame:ROLE_CHANGED_INFORM(name, changer, old, new)
+    if UnitName(self.unit) == name then
+         self:UpdateRole(new)
+    end
+end
+
+function UnitFrame:UNIT_POWER_UPDATE()
+    self:UpdatePower()
+end
+
+function UnitFrame:UpdateRole(role)
+    if role == nil then
+        role = UnitGroupRolesAssigned(self.unit)
+    end
+    if role == "HEALER" then
+        self:EnablePower(Enum.PowerType.Mana)
+    elseif role == "TANK" and select(3, UnitClass(self.unit)) == 6 then
+        self:EnablePower("RUNIC")
+    else
+        self:DisablePower()
+    end
+end
+
+function UnitFrame:UpdatePower()
+    local power = UnitPower(self.unit, self.powerType)
+    local max = UnitPowerMax(self.unit, self.powerType)
+    self.power:SetRange(0, max)
+    self.power:SetValue(power)
+end
+
+function UnitFrame:EnablePower(type)
+    self.powerType = type
+    local color = PowerBarColor[type]
+    self.power:SetColor(color.r, color.g, color.b)
+    self.power:Show()
+    self.secureFrame:RegisterUnitEvent("UNIT_POWER_UPDATE", self.unit)
+    self:UpdatePower()
+end
+
+function UnitFrame:DisablePower()
+    self.powerType = nil
+    self.secureFrame:UnregisterEvent("UNIT_POWER_UPDATE")
+    self.power:Hide()
+end
+
 function UnitFrame:OnShow()
+    self.secureFrame:RegisterEvent("ROLE_CHANGED_INFORM")
     self:StartRangeTicker()
     self:UpdateAll(self:HasUnitChanged())
 end
 
 function UnitFrame:OnHide()
+    self.secureFrame:UnregisterEvent("ROLE_CHANGED_INFORM")
     self.guid = nil
     self:StopRangeTicker()
 end
@@ -341,6 +390,7 @@ function UnitFrame:UpdateAll(unitChanged)
     self:UpdateHealthColor()
     self:UpdateRange()
     self:UpdateName()
+    self:UpdateRole() -- Also calls UpdatePower if power is visible
 end
 
 function UnitFrame:UpdateHealth()