Globalize modpath and worldpath

heightmap.lua

@@ -1,4 +1,4 @@
-local modpath = minetest.get_modpath(minetest.get_current_modname()) .. '/'
+local modpath = mapgen_rivers.modpath
 
 local make_polygons = dofile(modpath .. 'polygons.lua')
 local transform_quadri = dofile(modpath .. 'geometry.lua')

init.lua

@@ -1,6 +1,8 @@
 mapgen_rivers = {}
 
 local modpath = minetest.get_modpath(minetest.get_current_modname()) .. '/'
+mapgen_rivers.modpath = modpath
+mapgen_rivers.world_data_path = minetest.get_worldpath() .. '/river_data'
 
 dofile(modpath .. 'settings.lua')
 

load.lua

@@ -1,4 +1,4 @@
-local worldpath = minetest.get_worldpath() .. "/river_data/"
+local worldpath = minetest.world_data_path
 
 local function load_map(filename, bytes, signed, size)
 	local file = io.open(worldpath .. filename, 'rb')

polygons.lua

@@ -1,10 +1,10 @@
-local modpath = minetest.get_modpath(minetest.get_current_modname()) .. '/'
+local modpath = mapgen_rivers.modpath
 local mod_data_path = modpath .. 'river_data/'
 if not io.open(mod_data_path .. 'size', 'r') then
 	mod_data_path = modpath .. 'demo_data/'
 end
 
-local world_data_path = minetest.get_worldpath() .. '/river_data/'
+local world_data_path = minetest.world_data_path
 minetest.mkdir(world_data_path)
 
 local load_map = dofile(modpath .. 'load.lua')

terrainlib_lua/erosion.lua

@@ -108,15 +108,18 @@ local function diffuse(model, time)
     -- TODO Test this
 end
 
-local rivermapper, gaussian
+local modpath = ""
 if minetest then
-	rivermapper = dofile(minetest.get_modpath(minetest.get_current_modname()) .. '/terrainlib_lua/rivermapper.lua')
-	gaussian = dofile(minetest.get_modpath(minetest.get_current_modname()) .. '/terrainlib_lua/gaussian.lua')
-else
-	rivermapper = dofile('rivermapper.lua')
-	gaussian = dofile('gaussian.lua')
+    if minetest.global_exists(mapgen_rivers) then
+        modpath = mapgen_rivers.modpath .. "terrainlib_lua/"
+    else
+        modpath = minetest.get_modpath(minetest.get_current_modname()) .. "terrainlib_lua/"
+    end
 end
 
+local rivermapper = dofile(modpath .. "rivermapper.lua")
+local gaussian = dofile(modpath .. "gaussian.lua")
+
 local function flow(model)
 	model.dirs, model.lakes = rivermapper.flow_routing(model.dem, model.dirs, model.lakes, 'semirandom')
 	model.rivers = rivermapper.accumulate(model.dirs, model.rivers)