Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 LIGHT Tuner + 1 or more non-Tuner LIGHT monsters When this card declares an attack, if it is the only monster you control: You can equip 1 Equip Spell Card from your Deck to this face-up card.
--ヴァイロン・シグマ
--Vylon Sigma
local s,id=GetID()
function s.initial_effect(c)
	--synchro summon
	Synchro.AddProcedure(c,aux.FilterBoolFunctionEx(Card.IsAttribute,ATTRIBUTE_LIGHT),1,1,Synchro.NonTunerEx(Card.IsAttribute,ATTRIBUTE_LIGHT),1,99)
	c:EnableReviveLimit()
	--equip
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_EQUIP)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_ATTACK_ANNOUNCE)
	e1:SetCondition(s.eqcon)
	e1:SetTarget(s.eqtg)
	e1:SetOperation(s.eqop)
	c:RegisterEffect(e1)
end
function s.eqcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)<=1
end
function s.filter(c,ec)
	return c:IsType(TYPE_EQUIP) and c:CheckEquipTarget(ec)
end
function s.eqtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_SZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil,e:GetHandler()) end
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,nil,1,tp,LOCATION_DECK)
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if Duel.GetLocationCount(tp,LOCATION_SZONE)<=0 or c:IsFacedown() or not c:IsRelateToEffect(e) then return end
	Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,1))
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,c)
	if #g>0 then
		Duel.Equip(tp,g:GetFirst(),c)
	end
end