Add lots of water lakes to mangrove swamps

mods/MAPGEN/mcl_terrain_features/init.lua

@@ -29,7 +29,7 @@ local function airtower(pos,tbl,h)
 	end
 end
 
-local function makelake(pos,size,liquid,placein,border,pr)
+local function makelake(pos,size,liquid,placein,border,pr,noair)
 	local node_under = minetest.get_node(vector.offset(pos,0,-1,0))
 	local p1 = vector.offset(pos,-size,-1,-size)
 	local p2 = vector.offset(pos,size,-1,size)
@@ -70,7 +70,7 @@ local function makelake(pos,size,liquid,placein,border,pr)
 					end
 					if border == nil or border == "mcl_core:dirt" then border = "mcl_core:dirt_with_grass" end
 				end
-				if an.name ~= liquid then
+				if not noair and an.name ~= liquid then
 					table.insert(br,pp)
 					if un.name ~= liquid then
 						airtower(pp,air,55)
@@ -209,6 +209,27 @@ mcl_structures.register_structure("water_lake",{
 	end
 })
 
+mcl_structures.register_structure("water_lake_mangrove_swamp",{
+	place_on = {"mcl_mud:mud"},
+	biomes = { "MangroveSwamp" },
+	terrain_feature = true,
+	noise_params = {
+		offset = 0,
+		scale = 0.0032,
+		spread = {x = 250, y = 250, z = 250},
+		seed = 6343241353,
+		octaves = 3,
+		persist = 0.001,
+		flags = "absvalue",
+	},
+	flags = "place_center_x, place_center_z, force_placement",
+	y_max = mcl_vars.mg_overworld_max,
+	y_min = minetest.get_mapgen_setting("water_level"),
+	place_func = function(pos,def,pr)
+		return makelake(pos,3,"mcl_core:water_source",{"group:material_stone", "group:sand", "group:dirt","group:grass_block","mcl_mud:mud"},"mcl_mud:mud",pr,true)
+	end
+})
+
 local pool_adjacents = {
 	vector.new(1,0,0),
 	vector.new(-1,0,0),