View difference between Paste ID: PWfYVNzU and Y6L0JMHK

 prison_file_path='/usr/mobController/tables/prisons.tbl'
 chest_str = 'copper'
 
 function readChest(periph)
     chest = {}
 
     for i=1, periph.size() do
         if periph.getItemMeta(i)~=nil then
             table.insert(chest, {slot=i, meta=periph.getItemMeta(i)})
         end
     end
 --    print('readChest:', textutils.serialise(chest))
     return true, chest
 end
 
 function getPrisons()
     if not fs.exists(prison_file_path) then
         return false, 'prison_file_path is incorrect:\n'..prison_file_path
     end
     file = fs.open(prison_file_path, 'r')
     if not file then
         return false, 'Prisons table not found'
     end
     data = file.readAll()
     file.close()
     if not data or #data==0 then
         return false, 'Prisons data not found'
     end
     prisons=textutils.unserialise(data)
     return true, prisons
 end
 
 function writePrisons(prisons)
     file = fs.open(prison_file_path, 'w')
     file.write(textutils.serialize(prisons))
     file.flush()
     file.close()
     print('file closed and flushed')
 end
 
 function findByMeta(meta)
-    for k,v in pairs(getPrisons()) do
+    scs, tbl = getPrisons()
-        if v.meta = meta then
+    for k,v in pairs(tbl) do
-            return true, v
+        if v.meta.nbtHash == meta.nbtHash then
             return true, v
         end
     end
     return false
 end
 
 function addPrison(prison, slot)
     if not periph then
         return false, 'peripheral not found'
     end
     if not slot then
         return false, 'slot not provided'
     end
     if not periph.getItem(slot) then
         return false, 'nothing in slot:'..tostring(slot)
     end
     scs, prisons = getPrisons()
     table.insert(prisons, {slot=slot, meta=prison})
     return scs, prisons
 end
 
 function deletePrison(prisons, chest, del_item)
     scs, prison = chest.pushItems('up', del_item.slot, 1)
     if not scs then
         return false, 'unable to push '..prison.name
     end
     prisons.pop(del_item)
     return scs, prison
 end
-    item_cnt = periph.pullItem('down', 7, 1, periph.size())
+
-    if item_cnt = 0 then
+
 	if not periph then
 		return false, 'no peripheral sent'
-    item = periph.getItemMeta(chest.size())
+	end
     trade_slot = periph.size()
-        return false, 'Unable to read item in ',chest.size())
+    scs, check_item = periph.getItemMeta(trade_slot)
     if check_item then
-    prison = findByMeta(item)
+        return false, check_item.name..' is present in the last slot of the chest'
     end
 
     move_cnt = periph.pullItems('down', 7, 1, trade_slot)
-    periph.pushItem('down',chest.size(), 1, 7)
+    if move_cnt == 0 then
-    periph.pullItem('down',7, 1, prison.slot)
+
     end
     item = periph.getItemMeta(trade_slot)
     if not item then
-function putPrison()
+        return false, 'Unable to read item in ', trade_slot
     end
     scs, prison = findByMeta(item)
     if not prison then
         return false, 'Not a known prison.'
     end
     periph.pushItems('down',trade_slot, 1, 7)
     periph.pullItems('down',7, 1, prison.slot)
     return true, slot, prison
 end
 
 function putPrison(periph, prison)
     move_cnt=periph.pushItems('down', prison.slot, 1, 7)
     if move_cnt==0 then
         return false, move_cnt
     else
         return true, move_cnt, prison
     end
 end
 
 function resetPrisons(chest)
 	    pullPrison(chest)
     scs, prisons = readChest(chest)
     if scs then
         writePrisons(prisons)
     end
     return scs, prisons
 end
 
 
 -------------------------------------
 chest = nil
 
 for k,v in pairs(peripheral.getNames()) do
     if string.find(v, chest_str) then
     chest = peripheral.wrap(v)
     break
     end
 end
 
 scs, prisons = getPrisons()
 src = 'getPrisons'
 if not scs then
     scs, prisons = readChest(chest)
     src = 'readChest'
 end