Began moving values to config.lua so they can be specified in the .conf file

config.lua

@@ -0,0 +1,24 @@
+
+local CONFIG_FILE_PREFIX = "caverealms."
+
+caverealms.config = {}
+
+-- This function based on kaeza/minetest-irc/config.lua and used under the
+-- terms of BSD 2-clause license.
+local function setting(stype, name, default)
+	local value
+	if stype == "bool" then
+		value = minetest.setting_getbool(CONFIG_FILE_PREFIX..name)
+	elseif stype == "string" then
+		value = minetest.setting_get(CONFIG_FILE_PREFIX..name)
+	elseif stype == "number" then
+		value = tonumber(minetest.setting_get(CONFIG_FILE_PREFIX..name))
+	end
+	if value == nil then
+		value = default
+	end
+	caverealms.config[name] = value
+end
+
+setting("number", "ymin", -33000)
+setting("number", "ymax", -700)

init.lua

@@ -3,10 +3,16 @@
 -- Depends default
 -- License: code WTFPL
 
--- Parameters
+caverealms = {}
 
-local YMIN = -33000 -- Approximate realm limits.
-local YMAX = -700
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(modpath.."/config.lua")
+
+-- Parameters (see also config.lua)
+
+local YMIN = caverealms.config.ymin -- Approximate realm limits.
+local YMAX = caverealms.config.ymax
 local XMIN = -33000
 local XMAX = 33000
 local ZMIN = -33000
@@ -64,10 +70,6 @@ local np_wave = {
 	persist = 0.5
 }
 
--- Stuff
-
-caverealms = {}
-
 -- Nodes
 
 --glowing crystal