Force singlenode mapgen, add option to disable it

init.lua

@@ -3,7 +3,16 @@ The Origin
 version 1.2.0
 ]]
 
+local S
+if (minetest.get_modpath("intllib")) then
+	dofile(minetest.get_modpath("intllib").."/intllib.lua")
+	S = intllib.Getter(minetest.get_current_modname())
+else
+	S = function ( s ) return s end
+end
+
 origin = {}
+origin.settings = {}
 
 do
 	local filepath = minetest.get_worldpath().."/origin.mt"
@@ -14,10 +23,15 @@ do
 	else
 		origin.exists = false
 	end
+
+	origin.settings.force_singlenode = minetest.setting_getbool("origin_force_singlenode")
+	if origin.settings.force_singlenode == nil then
+		origin.settings.force_singlenode = true
+	end
 end
 
 minetest.register_node("origin:origin",{
-	description = "The Origin",
+	description = S("The Origin"),
 	is_ground_content = true,
 	groups = { not_in_creative_inventory = 1, immortal = 1 },
 	tiles = {"origin_origin.png"},
@@ -26,12 +40,14 @@ minetest.register_node("origin:origin",{
 })
 
 minetest.register_on_mapgen_init(function(mgparams)
-	origin.mgparams = mgparams
+	if origin.settings.force_singlenode == true then
+		minetest.set_mapgen_params({mgname = "singlenode"})
+	end
 end)
 
 minetest.register_on_generated(function(minp, maxp, seed)
 	local spawn = minetest.setting_get_pos("static_spawnpoint")
-	if origin.exists ~= true and origin.mgparams.mgname == "singlenode" then
+	if origin.exists ~= true then
 		local blockpos
 		if spawn ~= nil then
 			blockpos = { x=spawn.x, y=spawn.y-1, z=spawn.z }

settingtypes.txt

@@ -0,0 +1,6 @@
+# If enabled (true by default), the Origin mod automatically sets the map
+# generator to singlenode and ignores the player-selected map generator in
+# order to create an nearly empty world with the Origin near the center.
+# Disabling this setting will make this mod place the Origin without changing
+# the map generator, so it could appear in the v6 map generator, for example.
+origin_force_singlenode (Force singlenode map generator) bool true