Initial files.

NPCInfo.lua

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+local addonName = ...
+local NPCInfo = CreateFrame('frame')
+local Settings = {}
+
+-- Compat
+local function AddColoredDoubleLine(tooltip, leftT, rightT, leftC, rightC, wrap)
+  leftC = leftC or NORMAL_FONT_COLOR
+  rightC = rightC or HIGHLIGHT_FONT_COLOR
+  wrap = wrap or true
+  tooltip:AddDoubleLine(leftT, rightT, leftC.r, leftC.g, leftC.b, rightC.r, rightC.g, rightC.b, wrap);
+end
+
+function NPCInfo:OnEvent(e,...)
+  if e == "ADDON_LOADED" and ... == addonName then
+    NPCInfoDB = NPCInfoDB or {}
+    Settings = NPCInfoDB
+  end
+end
+
+function NPCInfo:ShowInfo(self)
+  if Settings.UsingMod and not IsModifierKeyDown() then return end
+  local _, unit = self:GetUnit()
+  local guid = UnitGUID(unit or "none")
+  local unitID = tonumber(guid:sub(-12, -7), 16)
+
+    if Settings.ShowNPCID and unitID ~= 0 then
+      AddColoredDoubleLine(self, "ID", unitID)
+    end
+end
+
+function NPCInfo:OnLoad()
+  self:RegisterEvent("ADDON_LOADED")
+  self:SetScript("OnEvent", self.OnEvent)
+
+  GameTooltip:HookScript("OnTooltipSetUnit", function(...) self:ShowInfo(...) end)
+
+  SLASH_NPCINFO1  = "/npcinfo"
+  function SlashCmdList.NPCINFO(...)
+    self:Help(...)
+  end
+end
+
+NPCInfo:OnLoad()
+
+local function AddMessage(...) _G.DEFAULT_CHAT_FRAME:AddMessage(strjoin(" ", tostringall(...))) end
+function NPCInfo:Help(msg)
+  local fName = "|cffEEE4AENPC Info:|r"
+  local _, _, cmd, args = string.find(msg, "%s?(%w+)%s?(.*)")
+  if not cmd or cmd == "" or cmd == "help" then
+    AddMessage(fName.." |cff58C6FA/npcinfo|r")
+    AddMessage("  |cff58C6FA/npcinfo id -|r  |cffEEE4AEToggles NPC ID|r")
+    AddMessage("  |cff58C6FA/npcinfo mod  -|r  |cffEEE4AEToggle only show with CTRL/ALT/SHIFT|r")
+
+  elseif cmd == "mod" then
+    if Settings.UsingMod then
+      AddMessage(fName, "Always show info")
+    else
+      AddMessage(fName, "Only show when using CTRL/ALT/SHIFT")
+    end
+    Settings.UsingMod = not Settings.UsingMod
+  elseif cmd == "id" then
+    if Settings.ShowNPCID then
+      AddMessage(fName, "Hide NPC ID")
+    else
+      AddMessage(fName, "Show NPC ID")
+    end
+    Settings.ShowNPCID = not Settings.ShowNPCID
+  end
+end

NPCInfo.toc

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+## Interface: 30300
+## Title: |cffEEE4AENPC Info|r
+## Notes: Based entirely off NPCTime, |cffFFC700slash command: /npcinfo|r
+## Author: Heyitsbench and Yuyuli
+## Version: 1.0.0
+## SavedVariables: NPCInfoDB
+
+NPCInfo.lua