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init.lua

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+randomizer = {}
+
+local id = minetest.get_content_id
+
+local function allowed_node(node, def)
+    local allowed =  node ~= "" and node ~= "air" and node ~= "ignore" and node ~= "unknown" 
+    and def and def.description and def.description ~= ""
+    and not string.match(node, "stair") and not string.match(node, "slab")
+    and not string.match(node, "fence") and not string.match(node, "bed")
+    and not string.match(node, "door") and def.light_source == 0
+    and def.groups.not_in_creative_inventory ~= 1
+    and node ~= "mcl_core:bedrock" and node ~= "default:water_source"
+    and node ~= "default:water_flowing" and node ~= "default:river_water_source"
+    and node ~= "default:river_water_flowing" and node ~= "default:lava_source"
+    and node ~= "default:lava_flowing" and node ~= "mcl_core:water_source"
+    and node ~= "mcl_core:water_flowing" and node ~= "mcl_core:lava_source"
+    and node ~= "mcl_core:lava_flowing" and node ~= "mcl_mobspawners:spawner"
+    return allowed
+end
+
+minetest.register_on_mods_loaded(function()
+    for node, def in pairs(minetest.registered_nodes) do
+        if allowed_node(node, def) then
+            table.insert(randomizer, node)
+        end
+    end
+    for _, node in pairs(randomizer) do
+        -- this is faster then check for all nodes in the randomizer list
+        -- in a loop in the minetest.register_on_generated function
+        minetest.override_item(node, {
+            randomizer = randomizer[math.random(#randomizer)]
+        })
+    end
+end)
+
+local data = {}
+
+minetest.register_on_generated(function(minp, maxp, blockseed)
+    local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = VoxelArea:new{ MinEdge = emin, MaxEdge = emax }
+	vm:get_data(data)
+    local data = vm:get_data()
+    for z = minp.z, maxp.z do
+        for y = minp.y, maxp.y do
+            for x = minp.x, maxp.x do
+                local vi = area:index(x, y, z)
+                local node_name = minetest.get_name_from_content_id(data[vi])
+                local node_def = minetest.registered_nodes[node_name]
+                if node_def.randomizer then
+                    data[vi] = minetest.get_content_id(node_def.randomizer)
+                end
+            end
+        end
+    end
+    vm:set_data(data)
+    vm:write_to_map(true)
+end)

mod.conf

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+name = randomizer
+author = NO11
+description = A survival challenge.