mods that hopefully work for a TechAge-based pack

mods/techage_modpack/signs_bot/random.lua

@@ -0,0 +1,72 @@
+--[[
+
+	Signs Bot
+	=========
+
+	Copyright (C) 2019-2021 Joachim Stolberg
+
+	GPL v3
+	See LICENSE.txt for more information
+
+	Signs Bot: Random Series
+
+]]--
+
+-- generate a table of unique pseudo random numbers
+local function gen_serie(inv_size)
+	local tbl = {}
+	local offs = inv_size/2
+	if offs % 2 == 1 then
+		offs = offs + 1
+	end
+	local index = 1
+
+	for n = 1, (inv_size*2) do
+		tbl[#tbl + 1] = index
+		index = ((index + offs) % inv_size) + 1
+	end
+	return tbl
+end
+
+-- Pseudo numbers series to iterate "randomly" through inventories
+local InvRandomSeries = {}
+
+local function get_serie(inv_size)
+	if not InvRandomSeries[inv_size] then
+		InvRandomSeries[inv_size] = gen_serie(inv_size)
+	end
+	return InvRandomSeries[inv_size]
+end
+
+local function random(inv_size)
+	local t = get_serie(inv_size)
+	local i = 0
+	local n = #t/2
+	local offs = math.random(n)
+	return function ()
+		i = i + 1
+		if i <= n then return t[i+offs] end
+	end
+end
+
+
+--
+--  API
+--
+-- func signs_bot.random(inv_size)
+--   random iterator providing 'inv_size' possible bot inventory stack numbers
+--   inv_size must be even and between 4 and 64
+signs_bot.random = random
+
+
+--
+-- Test
+--
+
+--for size = 4,64,2 do
+--	local tbl = {}
+--	for idx in random(size) do
+--		tbl[#tbl + 1] = idx
+--	end
+--	print(table.concat(tbl, ", "))
+--end