Build addons for Forever.

## Interface: 16001
## Title: Hello Forever
## Notes: A first addon for WoW Forever
## SavedVariables: HelloForeverDB
HelloForever.lua

local addonName = ...
local frame = CreateFrame("Frame")
frame:RegisterEvent("ADDON_LOADED")

frame:SetScript("OnEvent", function(self, event, loadedName)
    if loadedName ~= addonName then return end
    if type(HelloForeverDB) ~= "table" then
        HelloForeverDB = {}
    end
    if HelloForeverDB.enabled == nil then
        HelloForeverDB.enabled = true
    end
    self:UnregisterEvent("ADDON_LOADED")
    print("Hello Forever loaded. Type /hf")
end)

SLASH_HELLOFOREVER1 = "/hf"
SlashCmdList.HELLOFOREVER = function()
    HelloForeverDB.enabled = not HelloForeverDB.enabled
    print("Hello Forever:", HelloForeverDB.enabled and "on" or "off")
end

local function ReadNumber(fn, ...)
    if type(fn) ~= "function" then return nil end
    local ok, value = pcall(fn, ...)
    if not ok or (issecretvalue and issecretvalue(value)) then
        return nil
    end
    if type(value) ~= "number" or value ~= value
        or value == math.huge or value == -math.huge then
        return nil
    end
    return value
end

local ok, squared, checked = pcall(UnitDistanceSquared, "target")
if ok and not (issecretvalue and
    (issecretvalue(squared) or issecretvalue(checked)))
    and checked == true and type(squared) == "number"
    and squared == squared and squared >= 0
    and squared < math.huge then
    local yards = math.sqrt(squared)
    -- Display yards only in this branch.
end