clean up remove-wear code

remove-wear.lua

@@ -1,33 +1,21 @@
 -- Reset items in your fort to 0 wear
 -- original author: Laggy, edited by expwnent
-local help = [====[
-
-remove-wear
-===========
-Sets the wear on items in your fort to zero.  Usage:
-
-:remove-wear all:
-    Removes wear from all items in your fort.
-:remove-wear ID1 ID2 ...:
-    Removes wear from items with the given ID numbers.
-
-]====]
 
 local args = {...}
 local count = 0
 
-if args[1] == 'help' then
-    print(help)
+if not args[1] or args[1] == 'help' or args[1] == '-h' or args[1] == '--help' then
+    print(dfhack.script_help())
     return
 elseif args[1] == 'all' or args[1] == '-all' then
     for _, item in ipairs(df.global.world.items.all) do
-        if item.wear > 0 then --hint:df.item_actual
+        if item:getWear() > 0 then --hint:df.item_actual
             item:setWear(0)
             count = count + 1
         end
     end
 else
-    for i, arg in ipairs(args) do
+    for _, arg in ipairs(args) do
         local item_id = tonumber(arg)
         if item_id then
             local item = df.item.find(item_id)
@@ -43,4 +31,4 @@ else
     end
 end
 
-print('remove-wear: removed wear from '..count..' objects')
+print('remove-wear: removed wear from '..tostring(count)..' items')