move cycle plugin to new module; add features

cycle.py

@@ -0,0 +1,64 @@
+import simplejson as json
+from helpers import *
+
+cyclers_file = "plugins/redstoner-utils.py.dir/files/cycle.json"
+no_cyclers   = []
+try:
+  no_cyclers = json.loads(open(cyclers_file).read())
+except Exception, e:
+  error("Failed to load no_cyclers: %s" % e)
+
+
+@hook.command("cycle")
+def onCyclerCommand(sender, args):
+  plugHeader(sender, "Cycle")
+  if not isPlayer(sender):
+    msg(sender, "&conly players can do this")
+    return True
+  if not checkargs(sender, args, 1, 1):
+    return True
+
+  cmd = args[0].lower()
+  pid = sender.getUniqueId()
+  nop = pid in no_cyclers
+  if cmd == "on":
+    if nop:
+      no_cyclers.remove(pid)
+      msg(sender, "&aTurned &2on&a inventory cycling!")
+    else:
+      msg(sender, "&aAlready turned on.")
+  elif cmd == "off":
+    if not nop:
+      no_cyclers.append(pid)
+      msg(sender, "&aTurned &coff&a inventory cycling!")
+    else:
+      msg(sender, "&aAlready turned off.")
+  else:
+    msg(sender, "&cUsage: /cycle <on|off>")
+  return True
+
+
+@hook.event("player.PlayerItemHeldEvent", "normal")
+def onSlotChange(event):
+  player    = event.getPlayer()
+  if player.getUniqueId() not in no_cyclers:
+    prev_slot = event.getPreviousSlot()
+    new_slot  = event.getNewSlot()
+    if (prev_slot == 0 and new_slot == 8): # left -> right
+      doCycle(player, True)
+    elif (prev_slot == 8 and new_slot == 0): # right -> left
+      doCycle(player, False)
+
+
+def doCycle(player, up):
+  inv   = player.getInventory()
+  items = inv.getContents()
+  shift = -9 if up else 9
+  shift = shift % len(items)
+  for _ in range(4):
+    uniq_items = sorted(set(list(items)[:shift])) # crazy code
+    msg(player, items[:shift])
+    if uniq_items != [None]: # row not empty
+      break
+    items = items[shift:] + items[:shift] # shift "around"
+  inv.setContents(items)