From cfeb950d84e7ae33007df9185348d0569361086c Mon Sep 17 00:00:00 2001
From: Bernard Blackham <dagobah@ucc.gu.uwa.edu.au>
Date: Mon, 2 Aug 2004 10:19:38 +0000
Subject: [PATCH] Randomise gray code.

---
 sql-edition/servers/Idler.py      | 43 ++++++++++++++++++++++++++++++-
 sql-edition/servers/VendServer.py |  8 +++++-
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/sql-edition/servers/Idler.py b/sql-edition/servers/Idler.py
index 4efb56f..555630f 100755
--- a/sql-edition/servers/Idler.py
+++ b/sql-edition/servers/Idler.py
@@ -1,6 +1,9 @@
 #!/usr/bin/env python
 
 import string
+from random import random
+
+orderings = None
 
 class Idler:
 	def __init__(self, v):
@@ -74,8 +77,34 @@ class TrainIdler(Idler):
 	def reset(self):
 		self.idle_state = 0
 
+class OrderMaker:
+	def __init__(self, n=8):
+		self.n = n
+		self.a = []
+		self.u = []
+		self.s = []
+		for x in range(0,n):
+			self.u.append(False)
+		self.go()
+
+	def go(self):
+		from copy import deepcopy
+		if len(self.s) == self.n:
+			self.a.append(deepcopy(self.s))
+		else:
+			for x in range(0,self.n):
+				if self.u[x]: continue
+				self.s.append(x)
+				self.u[x] = True
+				self.go()
+				self.u[x] = False
+				self.s.pop()
+
+	def order(self):
+		return self.a
+
 class GrayIdler(Idler):
-	def __init__(self, v, one=None, zero=None):
+	def __init__(self, v, one=None, zero=None, reorder=0):
 		self.bits = 8
 		self.size = 1 << self.bits
 		self.i = 0
@@ -83,6 +112,10 @@ class GrayIdler(Idler):
 		self.v = v
 		self.one = one
 		self.zero = zero
+		self.reorder = reorder
+		global orderings
+		if not orderings:
+			orderings = OrderMaker().order()
 
 	def next(self):
 		output = self.do_next_state()
@@ -91,6 +124,12 @@ class GrayIdler(Idler):
 			output = string.replace(output, "0", self.zero)
 		if self.one:
 			output = string.replace(output, "1", self.one)
+		if self.reorder:
+			global orderings
+			newoutput = ""
+			for i in range(0,8):
+				newoutput += output[orderings[self.reorder][i]]
+			output = newoutput
 		self.v.display(" %8.8s " % (output))
 		self.i = (self.i + 1) % self.size
 
@@ -138,3 +177,5 @@ class GrayIdler(Idler):
 	def reset(self):
 		self.i = 0
 		self.grayCode = 0
+		if self.reorder:
+			self.reorder = int(random()*40320)
diff --git a/sql-edition/servers/VendServer.py b/sql-edition/servers/VendServer.py
index bed5366..992a65d 100755
--- a/sql-edition/servers/VendServer.py
+++ b/sql-edition/servers/VendServer.py
@@ -219,6 +219,9 @@ def setup_idlers(v):
 		GrayIdler(v,one="*",zero="-"),
 		GrayIdler(v,one="/",zero="\\"),
 		GrayIdler(v,one="X",zero="O"),
+		GrayIdler(v,one="*",zero="-",reorder=1),
+		GrayIdler(v,one="/",zero="\\",reorder=1),
+		GrayIdler(v,one="X",zero="O",reorder=1),
 		]
 	idler = choose_idler()
 
@@ -275,10 +278,13 @@ def run_forever(rfh, wfh, options, cf):
 			time_to_autologout = time() + 15
 
 		if time_to_idle == None and cur_user == '':
-			time_to_idle = time() + 2
+			time_to_idle = time() + 30
 			choose_idler()
 		if time_to_idle != None and cur_user != '': time_to_idle = None
 		if time_to_idle is not None and time() > time_to_idle: idle_step()
+		if time() > time_to_idle + 300:
+			time_to_idle = time()
+			choose_idler()
 
 		mk.update_display()
 
-- 
2.20.1