Add search pattern to compare items against the character's average item level

Author: shrugal

Search/CheckItem.lua

@@ -1568,6 +1568,27 @@ local function ItemLevelRangePatternCheck(details, text)
   return details.itemLevel and details.itemLevel >= tonumber(minText) and details.itemLevel <= tonumber(maxText)
 end
 
+local function AvgItemLevelPatternCheck(details, text)
+  if GetItemLevel(details) == false then
+    return false
+  end
+
+  local op1, op2, diff = text:match("^([<>=]?)avgilvl([+-]?)(%d*)$")
+  local avgIlvl = floor(GetAverageItemLevel() + 0.5)
+
+  if tonumber(diff) then
+    avgIlvl = avgIlvl + tonumber(diff) * (op2 == "-" and -1 or 1)
+  end
+
+  if op1 == "<" then
+    return details.itemLevel < avgIlvl
+  elseif op1 == ">" then
+    return details.itemLevel > avgIlvl
+  else
+    return details.itemLevel == avgIlvl
+  end
+end
+
 local function GetAuctionValue(details)
   if details.auctionValue then
     return details.auctionValue >= 0
@@ -1626,6 +1647,7 @@ end
 local patterns = {
   ["^[><=]?%d+$"] = ItemLevelPatternCheck,
   ["^%d+%-%d+$"] = ItemLevelRangePatternCheck,
+  ["^[><=]?avgilvl[+-]?%d*$"] = AvgItemLevelPatternCheck,
 
   ["^[><=]?%d+[gsc]$"] = AHValuePatternCheck,
   ["^%d+[gsc]%-%d+[gsc]$"] = AHValueRangePatternCheck,