From 7a3a6259d507a1dc418118a0fec52b6124ba0959 Mon Sep 17 00:00:00 2001
From: Manuel Simon Hirsig <simon.hirsig@gmail.com>
Date: Sun, 20 Mar 2016 21:13:56 +0100
Subject: [PATCH] vendor itemlink check

---
 merchant.lua | 47 +++++++++++++++++++++++++----------------------
 1 file changed, 25 insertions(+), 22 deletions(-)

diff --git a/merchant.lua b/merchant.lua
index 31671ca..ff9a012 100644
--- a/merchant.lua
+++ b/merchant.lua
@@ -30,31 +30,34 @@ function private.scan_merchant()
 -- TODO maybe more detail? zone or  local merchant_name = UnitName('npc')
     local merchant_item_count = GetMerchantNumItems()
     for i=1,merchant_item_count do
-        local item_id = Aux.info.parse_hyperlink(GetMerchantItemLink(i))
-        local _, _, price, count, stock = GetMerchantItemInfo(i)
-        local new_unit_price, new_limited = price / count, Aux.persistence.blizzard_boolean(stock >= 0)
-        if aux_merchant_buy[item_id] then
-            local fields = Aux.util.split(aux_merchant_buy[item_id], '#')
-            local old_unit_price, old_limited = tonumber(fields[1]), tonumber(fields[2])
+        local link = GetMerchantItemLink(i)
+        if link then
+            local item_id = Aux.info.parse_hyperlink(link)
+            local _, _, price, count, stock = GetMerchantItemInfo(i)
+            local new_unit_price, new_limited = price / count, Aux.persistence.blizzard_boolean(stock >= 0)
+            if aux_merchant_buy[item_id] then
+                local fields = Aux.util.split(aux_merchant_buy[item_id], '#')
+                local old_unit_price, old_limited = tonumber(fields[1]), tonumber(fields[2])
 
-            local unit_price
-            if old_limited and not new_limited then
-                unit_price = new_unit_price
-            elseif new_limited and not old_limited then
-                unit_price = old_unit_price
+                local unit_price
+                if old_limited and not new_limited then
+                    unit_price = new_unit_price
+                elseif new_limited and not old_limited then
+                    unit_price = old_unit_price
+                else
+                    unit_price = min(old_unit_price, new_unit_price)
+                end
+
+                aux_merchant_buy[item_id] = Aux.util.join({
+                    unit_price,
+                    old_limited or new_limited,
+                }, '#')
             else
-                unit_price = min(old_unit_price, new_unit_price)
+                aux_merchant_buy[item_id] = Aux.util.join({
+                    new_unit_price,
+                    new_limited,
+                }, '#')
             end
-
-            aux_merchant_buy[item_id] = Aux.util.join({
-                unit_price,
-                old_limited or new_limited,
-            }, '#')
-        else
-            aux_merchant_buy[item_id] = Aux.util.join({
-                new_unit_price,
-                new_limited,
-            }, '#')
         end
     end
 end
\ No newline at end of file