Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by sending 1 face-up "Dragunity" monster you control to the GY. When this card is Normal or Special Summoned from the hand: You can target 1 Dragon "Dragunity" monster in your GY; equip that target to this card.
--ドラグニティアームズ－ミスティル
--Dragunity Arma Mystletainn
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon1)
	e1:SetTarget(s.sptg1)
	e1:SetOperation(s.spop1)
	c:RegisterEffect(e1)
	--equip
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_LEAVE_GRAVE+CATEGORY_EQUIP)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCondition(s.eqcon)
	e2:SetTarget(s.eqtg)
	e2:SetOperation(s.eqop)
	c:RegisterEffect(e2)
	aux.AddEREquipLimit(c,nil,s.eqval,Card.EquipByEffectAndLimitRegister,e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	aux.AddEREquipLimit(c,nil,s.eqval,Card.EquipByEffectAndLimitRegister,e3)
end
function s.spfilter(c,ft)
	return c:IsFaceup() and c:IsSetCard(SET_DRAGUNITY) and c:IsAbleToGraveAsCost() and (ft>0 or c:GetSequence()<5)
end
function s.spcon1(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	local rg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_MZONE,0,nil,ft)
	return ft>-1 and #rg>0 and aux.SelectUnselectGroup(rg,e,tp,1,1,nil,0)
end
function s.sptg1(e,tp,eg,ep,ev,re,r,rp,c)
	local c=e:GetHandler()
	local g=nil
	local rg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_MZONE,0,nil,Duel.GetLocationCount(tp,LOCATION_MZONE))
	local g=aux.SelectUnselectGroup(rg,e,tp,1,1,nil,1,tp,HINTMSG_TOGRAVE,nil,nil,true)
	if #g>0 then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.spop1(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.SendtoGrave(g,REASON_COST)
	g:DeleteGroup()
end
function s.eqval(ec,c,tp)
	return ec:IsControler(tp) and ec:IsSetCard(SET_DRAGUNITY) and ec:IsRace(RACE_DRAGON)
end
function s.eqcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetPreviousLocation()==LOCATION_HAND
end
function s.filter(c)
	return c:IsSetCard(SET_DRAGUNITY) and c:IsRace(RACE_DRAGON) and not c:IsForbidden()
end
function s.eqtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_SZONE)>0
		and Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_LEAVE_GRAVE,g,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,g,1,0,0)
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		c:EquipByEffectAndLimitRegister(e,tp,tc)
	end
end