Use organization's LuaCheck workflow

Co-authored-by: sys4 <bricassa@sys4.fr>

.github/workflows/luacheck.yml

@@ -0,0 +1,10 @@
+name: luacheck
+on: [push, pull_request]
+jobs:
+  luacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Luacheck
+        uses: lunarmodules/luacheck@master

.luacheckrc

@@ -0,0 +1,18 @@
+unused_args = false
+
+globals = {
+	"biome_lib"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split", "trim"}},
+	table = {fields = {"copy"}},
+
+	-- Minetest
+	"minetest", "vector",
+	"dump", "PerlinNoise",
+
+	-- mods
+	"default",
+}

API.txt

@@ -1,34 +1,32 @@
 This document describes the Plantlife mod API.
 
-Last revision: 2015-02-16
+Last revision: 2021-04-20
 
 
 =========
 Functions
 =========
 
-There are three main functions defined by the main "biome_lib" mod:
+There are two main functions defined by this mod:
 
-spawn_on_surfaces()
-register_generate_plant()
-grow_plants()
+biome_lib.register_active_spawner()
+biome_lib.register_on_generate()
 
 There are also several internal, helper functions that can be called if so
 desired, but they are not really intended for use by other mods and may change
 at any time.  They are briefly described below these main functions, but see
 init.lua for details.
 
-Most functions in plants lib are declared locally to avoid namespace
-collisions with other mods.  They are accessible via the "biome_lib" method,
-e.g. biome_lib:spawn_on_surfaces() and so forth.
+Most functions in biome_lib are either declared locally or kept within its
+own namespace to avoid collisions/conflicts with other mods.
 
 =====
-spawn_on_surfaces(biome)
-spawn_on_surfaces(sdelay, splant, sradius, schance, ssurface, savoid)
+biome_lib.register_active_spawner(biome)
+biome_lib.register_active_spawner(sdelay, splant, sradius, schance, ssurface, savoid)
 
 This first function is an ABM-based spawner function originally created as
 part of Ironzorg's flowers mod.  It has since been largely extended and
-expanded.  There are two ways to call this function:  You can either pass it 
+expanded.  There are two ways to call this function:  You can either pass it
 several individual string and number parameters to use the legacy interface,
 or you can pass a single biome definition as a table, with all of your options
 spelled out nicely.  This is the preferred method.
@@ -72,6 +70,7 @@ biome = {
 	---- most likely want to use at least some of these to limit how and
 	---- where your objects are spawned.
 
+	label = string,		-- set this to identify the ABM for Minetest's profiler
 	avoid_nodes = {table},	-- same meaning as savoid, above
 	avoid_radius = num,	-- same as sradius
 	seed_diff = num,	-- The Perlin seed difference value passed to the
@@ -111,9 +110,9 @@ biome = {
 	depth_max = num,	-- If the object spawns on top of a water source, the
 						-- water must be at most this deep.  Defaults to 1.
 	min_elevation = num, -- Surface must be at this altitude or higher to
-						-- spawn at all.  Defaults to -31000...
-	max_elevation = num, -- ...but must be no higher than this altitude.
-						-- Defaults to +31000.
+						 -- spawn at all.  Defaults to -16 meters.
+	max_elevation = num, -- Surface must be no higher than this altitude.
+						 -- Defaults to +48.
 	near_nodes = {table}, -- List of nodes that must be somewhere in the
 						-- vicinity in order for the plant to spawn. Can also
 						-- be a string with a single node name.  If not
@@ -136,7 +135,7 @@ biome = {
 						-- radius.  Defaults to 1 but is ignored if near_nodes
 						-- isn't set.  Bear in mind that the total area to be
 						-- checked is equal to:
-						-- (near_nodes_size^2)*near_nodes_vertical*2 
+						-- (near_nodes_size^2)*near_nodes_vertical*2
 						-- For example, if size is 10 and vertical is 4, then
 						-- the area is (10^2)*8 = 800 nodes in size, so you'll
 						-- want to make sure you specify a value appropriate
@@ -203,7 +202,7 @@ biome = {
 }
 
 [*] spawn_plants must be either a table or a string.  If it's a table, the
-values therein are treated as a list of nodenames to pick from randomly on 
+values therein are treated as a list of nodenames to pick from randomly on
 each application of the ABM code. The more nodes you can pack into this
 parameter to avoid making too many calls to this function, the lower the CPU
 load will likely be.
@@ -219,14 +218,14 @@ checking is disabled.  Same holds true for the nneighbors bit above that.
 
 
 =====
-biome_lib:register_generate_plant(biome, nodes_or_function_or_treedef)
+biome_lib.register_on_generate(biome, nodes_or_function_or_treedef)
 
 To register an object to be spawned at mapgen time rather than via an ABM,
 call this function with two parameters:  a table with your object's biome
 information, and a string, function, or table describing what to do if the
 engine finds a suitable surface node (see below).
 
-The biome table contains quite a number of options, though there are fewer 
+The biome table contains quite a number of options, though there are fewer
 here than are available in the ABM-based spawner, as some stuff doesn't make
 sense at map-generation time.
 
@@ -238,7 +237,7 @@ biome = {
 	---- Everything else is optional, but you'll definitely want to use
 	---- some of these other fields to limit where and under what
 	---- conditions the objects are spawned.
-	
+
 	below_nodes = {table}, -- List of nodes that must be below the target
 						-- node.  Useful in snow biomes to keep objects from
 						-- spawning in snow that's on the wrong surface for
@@ -251,12 +250,21 @@ biome = {
 						-- skipped.  Avoid using excessively large radii.
 	rarity = num,		-- How rare should this object be in its biome? Larger
 						-- values make objects more rare, via:
-						-- math.random(1,100) > this
+						-- math.random() * 100 > this
+	rarity_fertility	-- The amount that the rarity is reduced by fertility.
+		= num,			-- This makes the rarity field the upper bound for
+						-- rarity, and (rarity - rarity_fertility) the lower
+						-- bound. Defaults to 0.
 	max_count = num,	-- The absolute maximum number of your object that
 						-- should be allowed to spawn in a 5x5x5 mapblock area
 						-- (80x80x80 nodes).  Defaults to 5, but be sure you
 						-- set this to some reasonable value depending on your
 						-- object and its size if 5 is insufficient.
+	tries = num,		-- the number of attempts that will be made to spawn
+						-- an object, defaults to 2. This means if the first
+						-- attempt fails due to something blocking the object
+						-- for example, another attempt will be made in
+						-- another random location.
 	seed_diff = num,	-- Perlin seed-diff value.  Defaults to 0, which
 						-- causes the function to inherit the global value of
 						-- 329.
@@ -269,8 +277,8 @@ biome = {
 	depth = num,		-- How deep/thick of a layer the spawned-on node must
 						-- be.  Typically used for water.
 	min_elevation = num, -- Minimum elevation in meters/nodes.  Defaults to
-						-- -31000 (unlimited).
-	max_elevation = num, -- Max elevation.  Defaults to +31000 (unlimited).
+						-- -16 meters.
+	max_elevation = num, -- Max elevation.  Defaults to +48m.
 	near_nodes = {table}, -- what nodes must be in the general vicinity of the
 						-- object being spawned.
 	near_nodes_size = num, -- how wide of a search area to look for the nodes
@@ -333,23 +341,26 @@ will be called in the form:
 
 	somefunction(pos)
 
-
 =====
-biome_lib:grow_plants(options)
+biome_lib.update_plant(options)
 
-The third function, grow_plants() is used to turn the spawned nodes above
-into something else over time.  This function has no return value, and accepts
-a biome definition table as the only parameter.  These are defined like so:
+This third function is used to turn the spawned nodes above into something
+else over time.  This function has no return value, and accepts a biome
+definition table as the only parameter.  These are defined like so:
 
 options = {
-	grow_plant = "string", -- Name of the node to be grown into something
-						-- else.  This value is passed to the ABM as the
-						-- "nodenames" parameter, so it is the plants
-						-- themselves that are the ABM trigger, rather than
+	label = string,		-- set this to identify the ABM for Minetest's
+						-- profiler.  If not set, biome_lib will set it to
+						-- "biome_lib.update_plant(): " appended with the node
+						-- in grow_plant (or the first item if it's a table)
+	grow_plant = "string" or {table}, -- Name(s) of the node(s) to be grown
+						-- into something else.  This value is passed to the
+						-- ABM as the "nodenames" parameter, so the plants
+						-- themselves are the ABM trigger, rather than
 						-- the ground they spawned on.  A plant will only grow
-						-- if the node above it is air.  Can also be a table,
-						-- but note that all nodes referenced therein will be
-						-- grown into the same object.
+						-- if the node above it is air.  If you use a table,
+						-- note that all nodes referenced therein will be
+						-- grown into the same final object.
 	grow_delay = num,	-- Passed as the ABM "interval" parameter, as with
 						-- spawning.
 	grow_chance = num,	-- Passed as the ABM "chance" parameter.
@@ -404,7 +415,7 @@ If this value is set to a simple string, this is treated as the name of the
 function to use to grow the plant.  In this case, all of the usual growing
 code is executeed, but then instead of a plant being simply added to the
 world, grow_result is ignored and the named function is executed and passed a
-few parmeters in the following general form: 
+few parmeters in the following general form:
 
 	somefunction(pos, perlin1, perlin2)
 
@@ -421,7 +432,7 @@ and grow_result is ignored.
 
 
 =====
-find_adjacent_wall(pos, verticals, randomflag)
+biome_lib.find_adjacent_wall(pos, verticals, randomflag)
 
 Of the few helper functions, this one expects a position parameter and a table
 with the list of nodes that should be considered as walls.  The code will
@@ -429,11 +440,11 @@ search around the given position for a neighboring wall, returning the first
 one it finds as a facedir value, or nil if there are no adjacent walls.
 
 If randomflag is set to true, the function will just return the facedir of any
-random wall it finds adjacent to the target position.  Defaults to false if 
+random wall it finds adjacent to the target position.  Defaults to false if
 not specified.
 
 =====
-is_node_loaded(pos)
+biome_lib.is_node_loaded(pos)
 
 This acts as a wrapper for the minetest.get_node_or_nil(node_pos)
 function and accepts a single position parameter.  Returns true if the node in
@@ -441,29 +452,39 @@ question is already loaded, or false if not.
 
 
 =====
-dbg(string)
+biome_lib.dbg(string, level)
 
 This is a simple debug output function which takes one string parameter.  It
 just checks if DEBUG is true and outputs the phrase "[Plantlife] " followed by
 the supplied string, via the print() function, if so.
 
-=====
-biome_lib:generate_tree(pos, treemodel)
-biome_lib:grow_tree(pos, treemodel)
+'level' is a number that, if supplied, dictates the lowest 'biome_lib_debug'
+can be set to in minetest.conf for this message to be displayed.  Both the
+default log level and the default message level are 0, thus always showing the
+supplied message.
 
-In the case of the growing code and the mapgen-based tree generator code, 
+Although it's not set in stone, a good practice is to use a level of 0 (or
+just omit the value) for anything that generally important enough that it
+ought always be shown, 1 for errors, 2 for warnings, 3 for info, 4 for verbose
+spammy stuff.
+
+=====
+biome_lib.generate_ltree(pos, treemodel)
+biome_lib.grow_ltree(pos, treemodel)
+
+In the case of the growing code and the mapgen-based tree generator code,
 generating a tree is done via the above two calls, which in turn immediately
 call the usual spawn_tree() functions.  This rerouting exists as a way for
 other mods to hook into biome_lib's tree-growing functions in general,
 perhaps to execute something extra whenever a tree is spawned.
 
-biome_lib:generate_tree(pos, treemodel) is called any time a tree is spawned
+biome_lib.generate_ltree(pos, treemodel) is called any time a tree is spawned
 at map generation time.  'pos' is the position of the block on which the tree
 is to be placed.  'treemodel' is the standard L-Systems tree definition table
 expected by the spawn_tree() function.  Refer to the 'trunk' field in that
 table to derive the name of the tree being spawned.
 
-biome_lib:grow_tree(pos, treemodel) does the same sort of thing whenever a 
+biome_lib.grow_ltree(pos, treemodel) does the same sort of thing whenever a
 tree is spawned within the abm-based growing code, for example when growing a
 sapling into a tree.
 
@@ -472,22 +493,6 @@ sapling into a tree.
 There are other, internal helper functions that are not meant for use by other
 mods.  Don't rely on them, as they are subject to change without notice.
 
-
-===============
-Global Settings
-===============
-
-Set this to true if you want the mod to spam your console with debug info :-)
-
-	plantlife_debug = false
-
-To slow down the playback of the queue (e.g. for really slow machines where
-the 0.2 second max limiter isn't enough), set:
-
-	biome_lib_queue_run_ratio = <some value 1 to 100>
-
-Default is 100 (basically percent of maximum runtime)
-
 ======================
 Fertile Ground Mapping
 ======================
@@ -499,7 +504,6 @@ Perlin noise used.
 The first one is for a "fertile ground" layer, which I tend to refer to as the
 generic "stuff can potentially grow here" layer.  Its values are hard-coded:
 
-	biome_lib.plantlife_seed_diff = 329
 	perlin_octaves = 3
 	perlin_persistence = 0.6
 	perlin_scale = 100
@@ -523,7 +527,7 @@ appears to be the standard now.  Those values are:
 	temperature_persistence = 0.5
 	temperature_scale = 150
 
-The way Perlin values are used by this mod, in keeping with the snow mod's 
+The way Perlin values are used by this mod, in keeping with the snow mod's
 apparent methods, larger values returned by the Perlin function represent
 *colder* temperatures.  In this mod, the following table gives a rough
 approximation of how temperature maps to these values, normalized to
@@ -547,7 +551,7 @@ Perlin		Approx. Temperature
 
 Included in this table are even 0.25 steps in Perlin values along with some
 common temperatures on both the Centigrade and Fahrenheit scales.  Note that
-unless you're trying to model the Moon or perhaps Mercury in your mods/maps, 
+unless you're trying to model the Moon or perhaps Mercury in your mods/maps,
 you probably won't need to bother with Perlin values of less than -0.56 or so.
 
 
@@ -583,3 +587,79 @@ And this particular one is mapped slightly differently from the others:
 
 (Note the +150 and +50 offsets)
 
+
+==================
+Default game nodes
+==================
+
+Although this project was intended to be used with minetest_game, it can be
+configured to work with something else instead.  All you need to do is provide
+the names of the nodes in your game you want biome_lib's internals to use.
+
+See settingtypes.txt for a list.  Any item listed there can be changed either
+by adding it to your minetest.conf, or by using the "all settings" menu in
+Minetest, whatever's appropriate for your particular setup.
+
+==================
+Engine Decorations
+==================
+
+If a call to biome_lib.register_on_generate() contains items and biome
+definition settings that are suitable, biome_lib will pass that call on to the
+engine instead, to use its built-in decorations feature, since it'll be much
+faster than Lua.
+
+For this to work, first the item to be added must either be a node, or a
+table with a list of nodes that biome_lib would normally pick from randomly.
+That is to say, you cannot specify an L-tree or a function here, as the engine
+does not support that sort of thing (biome_lib will just switch to its normal
+handling if you do).
+
+Second, these biome definition items must not be present:
+
+* below_nodes
+* avoid_nodes
+* avoid_radius
+* neighbors
+* ncount
+* depth
+* near_nodes_size
+* near_nodes_vertical
+* temp_min
+* temp_max
+* verticals_list
+* delete_above
+* delete_above_surround
+
+The plantlife_limit definition item is ignored when checking if a particular
+call can be routed to the engine.
+
+The call given to the engine will use the remaining biome definition items in
+the following manner:
+
+deco_type =		"simple",
+flags =			"all_floors"
+decoration =	node or table with node list
+place_on =		surface
+y_min =			min_elevation
+y_max =			max_elevation
+spawn_by =		near_nodes
+num_spawn_by = 	near_nodes_count
+param2 = 		\_ set to the range specified by the biome definition's
+param2_max = 	/  random_facedir table, if present, otherwise omitted
+noise_params = {
+	octaves = biome_lib.fertile_perlin_octaves,
+	persist = biome_lib.fertile_perlin_persistence * (250/biome_lib.fertile_perlin_scale),
+	scale = ((100-biome.rarity)/100) * (math.min(biome.max_count, 6400)/6400),
+	seed = biome.seed_diff,
+	offset = 0,
+	spread = {x = 100, y = 100, z = 100},
+	lacunarity = 2,
+	flags = "absvalue"
+}
+
+If the biome definition's check_air setting is false, "force_placement" is
+added to the decoration's flags setting.
+
+If the biome def's spawn_replace_node is set to true, the decoration's
+place_offset_y is set to -1 (otherwise it is omitted).

README.md

@@ -12,10 +12,10 @@ Both mapgen-based spawning and ABM-based spawning is supported. Growing code is
 
 It is primarily intended for mapgen v6, but it should work fine when used with mapgen v7.
 
-**Dependencies**: default from minetest_game
+**Dependencies:** nothing, but if you don't use `minetest_game`, you'll need to supply some settings (see API.txt).
 
-**Recommends**: [Plantlife Modpack](https://github.com/minetest-mods/plantlife_modpack), 
-[More Trees](https://github.com/minetest-mods/moretrees)
+**Recommends**: [Plantlife Modpack](https://github.com/mt-mods/plantlife_modpack), 
+[More Trees](https://github.com/mt-mods/moretrees)
 
 **API**: This mod supplies a small number of very powerful functions. They are, briefly:
 
@@ -25,4 +25,6 @@ It is primarily intended for mapgen v6, but it should work fine when used with m
 * biome_lib:find_valid_wall()
 * biome_lib:is_node_loaded()
 
-For a complete description of these functions as well as several of the internal variables within the mod, [read the API.txt document](https://raw.githubusercontent.com/minetest-mods/biome_lib/master/API.txt) included in this package.
+For a complete description of these functions as well as several of the internal variables within the mod, see `API.txt`.
+
+**Configuration:** This mod has several variables you can set in your `minetest.conf` to change things a bit, from the default nodes it uses, to the debug log level and the block queue behavior.  For a list with complete descriptions, see `settingtypes.txt`.

api.lua

@@ -0,0 +1,695 @@
+biome_lib.block_log = {}
+biome_lib.block_recheck_list = {}
+biome_lib.run_block_recheck_list = false
+
+biome_lib.actionslist_aircheck = {}
+biome_lib.actionslist_no_aircheck = {}
+
+biome_lib.surfaceslist_aircheck = {}
+biome_lib.surfaceslist_no_aircheck = {}
+
+biome_lib.registered_decorations = {}
+
+biome_lib.fertile_perlin_octaves = 3
+biome_lib.fertile_perlin_persistence = 0.6
+biome_lib.fertile_perlin_scale = 100
+
+local time_speed = tonumber(minetest.settings:get("time_speed"))
+biome_lib.time_scale = 1
+
+if time_speed and time_speed > 0 then
+	biome_lib.time_scale = 72 / time_speed
+end
+
+biome_lib.air = {name = "air"}
+
+-- the mapgen rarely creates useful surfaces outside this range, but mods can
+-- still specify a wider range if needed.
+biome_lib.mapgen_elevation_limit = { ["min"] = -16, ["max"] = 48 }
+
+
+-- Local functions
+
+function biome_lib.dbg(msg, level)
+	local l = tonumber(level) or 0
+	if biome_lib.debug_log_level >= l then
+		print(os.date("%Y-%m-%d %H:%M:%S").." [Biome Lib]: "..msg)
+		minetest.log("verbose", "[Biome Lib]: "..msg)
+	end
+end
+
+local function get_biome_data(pos, perlin_fertile)
+	local fertility = perlin_fertile:get_2d({x=pos.x, y=pos.z})
+
+	local data = minetest.get_biome_data(pos)
+	-- Original values this method returned were +1 (lowest) to -1 (highest)
+	-- so we need to convert the 0-100 range from get_biome_data() to that.
+	return fertility, 1 - (data.heat / 100 * 2), 1 - (data.humidity / 100 * 2)
+end
+
+function biome_lib.is_node_loaded(node_pos)
+	local n = minetest.get_node_or_nil(node_pos)
+	if (not n) or (n.name == "ignore") then
+		return false
+	end
+	return true
+end
+
+function biome_lib.set_defaults(biome)
+
+	biome.seed_diff = biome.seed_diff or 0
+	biome.min_elevation = biome.min_elevation or biome_lib.mapgen_elevation_limit.min
+	biome.max_elevation = biome.max_elevation or biome_lib.mapgen_elevation_limit.max
+	biome.temp_min = biome.temp_min or 1
+	biome.temp_max = biome.temp_max or -1
+	biome.humidity_min = biome.humidity_min or 1
+	biome.humidity_max = biome.humidity_max or -1
+	biome.plantlife_limit = biome.plantlife_limit or 0.1
+	biome.near_nodes_vertical = biome.near_nodes_vertical or 1
+
+-- specific to on-generate
+
+	biome.neighbors = biome.neighbors or biome.surface
+	biome.near_nodes_size = biome.near_nodes_size or 0
+	biome.near_nodes_count = biome.near_nodes_count or 1
+	biome.rarity = biome.rarity or 50
+	biome.rarity_fertility = biome.rarity_fertility or 0
+	biome.max_count = biome.max_count or 125
+	biome.tries = biome.tries or 2
+	if biome.check_air ~= false then biome.check_air = true end
+
+-- specific to abm spawner
+	biome.seed_diff = biome.seed_diff or 0
+	biome.light_min = biome.light_min or 0
+	biome.light_max = biome.light_max or 15
+	biome.depth_max = biome.depth_max or 1
+	biome.facedir = biome.facedir or 0
+	return biome
+end
+
+local function search_table(t, s)
+	for i = 1, #t do
+		if t[i] == s then return true end
+	end
+	return false
+end
+
+-- register the list of surfaces to spawn stuff on, filtering out all duplicates.
+-- separate the items by air-checking or non-air-checking map eval methods
+
+function biome_lib.register_on_generate(biomedef, nodes_or_function_or_model)
+
+	-- if calling code passes an undefined node for a surface or
+	-- as a node to be spawned, don't register an action for it.
+
+	if type(nodes_or_function_or_model) == "string"
+	  and string.find(nodes_or_function_or_model, ":")
+	  and not minetest.registered_nodes[nodes_or_function_or_model] then
+		biome_lib.dbg("Warning: Ignored registration for undefined spawn node: "..
+				dump(nodes_or_function_or_model), 2)
+		return
+	end
+
+	if type(nodes_or_function_or_model) == "string"
+	  and not string.find(nodes_or_function_or_model, ":") then
+		biome_lib.dbg("Warning: Registered function call using deprecated string method: "..
+				dump(nodes_or_function_or_model), 2)
+	end
+
+	biome_lib.mapgen_elevation_limit.min = math.min(biomedef.min_elevation or 0, biome_lib.mapgen_elevation_limit.min)
+	biome_lib.mapgen_elevation_limit.max = math.max(biomedef.max_elevation or 0, biome_lib.mapgen_elevation_limit.max)
+
+	local decor_def = biome_lib.can_use_decorations(biomedef, nodes_or_function_or_model)
+
+	if decor_def then
+		biome_lib.dbg("Using engine decorations instead of biome_lib functions for node(s): "..
+				dump(nodes_or_function_or_model), 3)
+		biome_lib.registered_decorations[#biome_lib.registered_decorations + 1] = nodes_or_function_or_model
+		minetest.register_decoration(decor_def)
+		return
+	elseif biomedef.check_air == false then
+		biome_lib.dbg("Register no-air-check mapgen hook: "..dump(nodes_or_function_or_model), 3)
+		biome_lib.actionslist_no_aircheck[#biome_lib.actionslist_no_aircheck + 1] = {biomedef, nodes_or_function_or_model}
+		local s = biomedef.surface
+		if type(s) == "string" then
+			if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
+				if not search_table(biome_lib.surfaceslist_no_aircheck, s) then
+					biome_lib.surfaceslist_no_aircheck[#biome_lib.surfaceslist_no_aircheck + 1] = s
+				end
+			else
+				biome_lib.dbg("Warning: Ignored no-air-check registration for undefined surface node: "..dump(s), 2)
+			end
+		else
+			for i = 1, #biomedef.surface do
+				s = biomedef.surface[i]
+				if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
+					if not search_table(biome_lib.surfaceslist_no_aircheck, s) then
+						biome_lib.surfaceslist_no_aircheck[#biome_lib.surfaceslist_no_aircheck + 1] = s
+					end
+				else
+					biome_lib.dbg("Warning: Ignored no-air-check registration for undefined surface node: "..dump(s), 2)
+				end
+			end
+		end
+	else
+		biome_lib.dbg("Register with-air-checking mapgen hook: "..dump(nodes_or_function_or_model), 3)
+		biome_lib.actionslist_aircheck[#biome_lib.actionslist_aircheck + 1] = { biomedef, nodes_or_function_or_model }
+		local s = biomedef.surface
+		if type(s) == "string" then
+			if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
+				if not search_table(biome_lib.surfaceslist_aircheck, s) then
+					biome_lib.surfaceslist_aircheck[#biome_lib.surfaceslist_aircheck + 1] = s
+				end
+			else
+				biome_lib.dbg("Warning: Ignored with-air-checking registration for undefined surface node: "..dump(s), 2)
+			end
+		else
+			for i = 1, #biomedef.surface do
+				s = biomedef.surface[i]
+				if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
+					if not search_table(biome_lib.surfaceslist_aircheck, s) then
+						biome_lib.surfaceslist_aircheck[#biome_lib.surfaceslist_aircheck + 1] = s
+					end
+				else
+					biome_lib.dbg("Warning: Ignored with-air-checking registration for undefined surface node: "..dump(s), 2)
+				end
+			end
+		end
+	end
+end
+
+-- Function to check whether a position matches the given biome definition
+-- Returns true when the surface can be populated
+
+local function populate_single_surface(biome, pos, perlin_fertile_area, checkair)
+	local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
+
+	if biome.rarity - biome.rarity_fertility == 100 then
+		return
+	end
+
+	local fertility, temperature, humidity = get_biome_data(pos, perlin_fertile_area)
+
+	if math.random() * 100 <= (biome.rarity - ((fertility + 1) / 2 * biome.rarity_fertility)) then
+		return
+	end
+
+	local pos_biome_ok = pos.y >= biome.min_elevation and pos.y <= biome.max_elevation
+		and fertility >= biome.plantlife_limit
+		and temperature <= biome.temp_min and temperature >= biome.temp_max
+		and humidity <= biome.humidity_min and humidity >= biome.humidity_max
+
+	if not pos_biome_ok then
+		return -- Y position mismatch, outside of biome
+	end
+
+	local biome_surfaces_string = dump(biome.surface)
+	local surface_ok = false
+
+	if not biome.depth then
+		local dest_node = minetest.get_node(pos)
+		if string.find(biome_surfaces_string, dest_node.name) then
+			surface_ok = true
+		else
+			if string.find(biome_surfaces_string, "group:") then
+				for j = 1, #biome.surface do
+					if string.find(biome.surface[j], "^group:")
+					  and minetest.get_item_group(dest_node.name, biome.surface[j]) then
+						surface_ok = true
+						break
+					end
+				end
+			end
+		end
+	elseif not string.find(biome_surfaces_string,
+			minetest.get_node({ x = pos.x, y = pos.y-biome.depth-1, z = pos.z }).name) then
+		surface_ok = true
+	end
+
+	if not surface_ok then
+		return -- Surface does not match the given node group/name
+	end
+
+	if checkair and minetest.get_node(p_top).name ~= "air" then
+		return
+	end
+
+	if biome.below_nodes and
+			not string.find(dump(biome.below_nodes),
+				minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name
+			) then
+		return -- Node below does not match
+	end
+
+	if biome.ncount and
+			#minetest.find_nodes_in_area(
+				{x=pos.x-1, y=pos.y, z=pos.z-1},
+				{x=pos.x+1, y=pos.y, z=pos.z+1},
+				biome.neighbors
+			) <= biome.ncount then
+		return -- Not enough similar biome nodes around
+	end
+
+	if biome.near_nodes and
+			#minetest.find_nodes_in_area(
+				{x=pos.x-biome.near_nodes_size, y=pos.y-biome.near_nodes_vertical, z=pos.z-biome.near_nodes_size},
+				{x=pos.x+biome.near_nodes_size, y=pos.y+biome.near_nodes_vertical, z=pos.z+biome.near_nodes_size},
+				biome.near_nodes
+			) < biome.near_nodes_count then
+		return -- Long distance neighbours do not match
+	end
+
+	-- Position fits into given biome
+	return true
+end
+
+function biome_lib.populate_surfaces(b, nodes_or_function_or_model, snodes, checkair)
+	local items_added = 0
+
+	local biome = biome_lib.set_defaults(b)
+
+	-- filter stage 1 - find nodes from the supplied surfaces that are within the current biome.
+
+	local in_biome_nodes = {}
+	local perlin_fertile_area = minetest.get_perlin(biome.seed_diff, biome_lib.fertile_perlin_octaves,
+			biome_lib.fertile_perlin_persistence, biome_lib.fertile_perlin_scale)
+
+	for i = 1, #snodes do
+		local pos = vector.new(snodes[i])
+		if populate_single_surface(biome, pos, perlin_fertile_area, checkair) then
+			in_biome_nodes[#in_biome_nodes + 1] = pos
+		end
+	end
+
+	-- filter stage 2 - find places within that biome area to place the plants.
+
+	local num_in_biome_nodes = #in_biome_nodes
+
+	if num_in_biome_nodes == 0 then
+		return 0
+	end
+
+	for i = 1, math.min(math.ceil(biome.max_count/25), num_in_biome_nodes) do
+		local tries = 0
+		local spawned = false
+		while tries < biome.tries and not spawned do
+			local pos = in_biome_nodes[math.random(1, num_in_biome_nodes)]
+
+			local will_place = true
+			local fdir = nil
+			if biome.random_facedir then
+				fdir = math.random(biome.random_facedir[1], biome.random_facedir[2])
+			end
+
+			if biome.spawn_on_side then
+				local onside = biome_lib.find_open_side(pos)
+				if onside then
+					pos = onside.newpos
+					fdir = onside.facedir
+				else
+					will_place = false
+				end
+			elseif biome.spawn_on_bottom then
+				if minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name == "air" then
+					pos.y = pos.y - 1
+				else
+					will_place = false
+				end
+			elseif biome.spawn_replace_node then
+				pos.y = pos.y-1
+			end
+
+			local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
+
+			if will_place and not (biome.avoid_nodes and biome.avoid_radius
+					and minetest.find_node_near(p_top, biome.avoid_radius
+					+ math.random(-1.5,2), biome.avoid_nodes)) then
+				if biome.delete_above then
+					minetest.swap_node(p_top, biome_lib.air)
+					minetest.swap_node({x=p_top.x, y=p_top.y+1, z=p_top.z}, biome_lib.air)
+				end
+
+				if biome.delete_above_surround then
+					minetest.swap_node({x=p_top.x-1, y=p_top.y, z=p_top.z}, biome_lib.air)
+					minetest.swap_node({x=p_top.x+1, y=p_top.y, z=p_top.z}, biome_lib.air)
+					minetest.swap_node({x=p_top.x,   y=p_top.y, z=p_top.z-1}, biome_lib.air)
+					minetest.swap_node({x=p_top.x,   y=p_top.y, z=p_top.z+1}, biome_lib.air)
+
+					minetest.swap_node({x=p_top.x-1, y=p_top.y+1, z=p_top.z}, biome_lib.air)
+					minetest.swap_node({x=p_top.x+1, y=p_top.y+1, z=p_top.z}, biome_lib.air)
+					minetest.swap_node({x=p_top.x,   y=p_top.y+1, z=p_top.z-1}, biome_lib.air)
+					minetest.swap_node({x=p_top.x,   y=p_top.y+1, z=p_top.z+1}, biome_lib.air)
+				end
+
+				if biome.spawn_replace_node then
+					minetest.swap_node(pos, biome_lib.air)
+				end
+
+				local objtype = type(nodes_or_function_or_model)
+
+				if objtype == "table" then
+					if nodes_or_function_or_model.axiom then
+						biome_lib.generate_ltree(p_top, nodes_or_function_or_model)
+						biome_lib.dbg("An L-tree was spawned at "..minetest.pos_to_string(p_top), 4)
+						spawned = true
+					else
+						local n=nodes_or_function_or_model[math.random(#nodes_or_function_or_model)]
+						minetest.swap_node(p_top, { name = n, param2 = fdir })
+						biome_lib.dbg("Node \""..n.."\" was randomly picked from a list and placed at "..
+								minetest.pos_to_string(p_top), 4)
+						spawned = true
+					end
+				elseif objtype == "string" and
+				  minetest.registered_nodes[nodes_or_function_or_model] then
+					minetest.swap_node(p_top, { name = nodes_or_function_or_model, param2 = fdir })
+					biome_lib.dbg("Node \""..nodes_or_function_or_model.."\" was placed at "..
+							minetest.pos_to_string(p_top), 4)
+					spawned = true
+				elseif objtype == "function" then
+					nodes_or_function_or_model(pos, fdir)
+					biome_lib.dbg("A function was run on surface node at "..minetest.pos_to_string(pos), 4)
+					spawned = true
+				elseif objtype == "string" and pcall(loadstring(("return %s(...)"):
+					format(nodes_or_function_or_model)),pos) then
+					spawned = true
+					biome_lib.dbg("An obsolete string-specified function was run on surface node at "..
+							minetest.pos_to_string(p_top), 4)
+				else
+					biome_lib.dbg("Warning: Ignored invalid definition for object "..
+							dump(nodes_or_function_or_model).." that was pointed at {"..dump(pos).."}", 2)
+				end
+			else
+				tries = tries + 1
+			end
+		end
+		if spawned then items_added = items_added + 1 end
+	end
+	return items_added
+end
+
+-- Primary log read-out/mapgen spawner
+
+local function confirm_block_surroundings(p)
+	local n=minetest.get_node_or_nil(p)
+	if not n or n.name == "ignore" then return false end
+
+	for x = -32,32,64 do -- step of 64 causes it to only check the 8 corner blocks
+		for y = -32,32,64 do
+			for z = -32,32,64 do
+				n = minetest.get_node_or_nil({x=p.x + x, y=p.y + y, z=p.z + z})
+				if not n or n.name == "ignore" then return false end
+			end
+		end
+	end
+	return true
+end
+
+function biome_lib.generate_block(shutting_down)
+
+	if shutting_down then
+		if #biome_lib.block_recheck_list > 0 then
+			for i = 1, #biome_lib.block_recheck_list do
+				biome_lib.block_log[#biome_lib.block_log + 1] = biome_lib.block_recheck_list[i]
+			end
+			biome_lib.block_recheck_list = {}
+		end
+		biome_lib.run_block_recheck_list = false
+	else
+		if biome_lib.run_block_recheck_list
+		  and not biome_lib.block_recheck_list[1] then
+				biome_lib.run_block_recheck_list = false
+		end
+	end
+
+	local blocklog = biome_lib.run_block_recheck_list
+	  and biome_lib.block_recheck_list
+	  or biome_lib.block_log
+
+	if not blocklog[1] then return end
+
+	local minp =		blocklog[1][1]
+	local maxp =		blocklog[1][2]
+	local airflag = 	blocklog[1][3]
+
+	if not biome_lib.pos_hash then -- we need to read the maplock and get the surfaces list
+		local now = minetest.get_us_time()
+		biome_lib.pos_hash = {}
+		minetest.load_area(minp)
+		if not confirm_block_surroundings(minp)
+		  and not shutting_down
+			-- if any neighbors appear not to be loaded and the block hasn't expired yet, defer it
+		  and (blocklog[1][4] + biome_lib.block_timeout) > now then
+
+			if biome_lib.run_block_recheck_list then
+				biome_lib.block_log[#biome_lib.block_log + 1] = table.copy(biome_lib.block_recheck_list[1])
+				table.remove(biome_lib.block_recheck_list, 1)
+			else
+				biome_lib.block_recheck_list[#biome_lib.block_recheck_list + 1] = table.copy(biome_lib.block_log[1])
+				table.remove(biome_lib.block_log, 1)
+			end
+			biome_lib.pos_hash = nil
+				biome_lib.dbg("Mapblock at "..minetest.pos_to_string(minp)..
+					" had a neighbor not fully emerged, skipped it for now.", 4)
+			return
+		else
+			biome_lib.pos_hash.surface_node_list = airflag
+				and minetest.find_nodes_in_area_under_air(minp, maxp, biome_lib.surfaceslist_aircheck)
+				or minetest.find_nodes_in_area(minp, maxp, biome_lib.surfaceslist_no_aircheck)
+			if #biome_lib.pos_hash.surface_node_list == 0 then
+				biome_lib.dbg("Mapblock at "..minetest.pos_to_string(minp).." dequeued:  no detected surfaces.", 4)
+				table.remove(blocklog, 1)
+				biome_lib.pos_hash = nil
+				return
+			else
+				biome_lib.pos_hash.action_index = 1
+				biome_lib.dbg("Mapblock at "..minetest.pos_to_string(minp)..
+					" has "..#biome_lib.pos_hash.surface_node_list..
+					" surface nodes to work on (airflag="..dump(airflag)..")", 4)
+			end
+		end
+	elseif not (airflag and biome_lib.actionslist_aircheck[biome_lib.pos_hash.action_index])
+	  and not (not airflag and biome_lib.actionslist_no_aircheck[biome_lib.pos_hash.action_index]) then
+		-- the block is finished, remove it
+		if #biome_lib.pos_hash.surface_node_list > 0 then
+			biome_lib.dbg("Deleted mapblock "..minetest.pos_to_string(minp).." from the block log", 4)
+		end
+		table.remove(blocklog, 1)
+		biome_lib.pos_hash = nil
+	else
+		-- below, [1] is biome, [2] is the thing to be added
+		local added = 0
+		if airflag then
+			if biome_lib.actionslist_aircheck[biome_lib.pos_hash.action_index] then
+				added = biome_lib.populate_surfaces(
+							biome_lib.actionslist_aircheck[biome_lib.pos_hash.action_index][1],
+							biome_lib.actionslist_aircheck[biome_lib.pos_hash.action_index][2],
+							biome_lib.pos_hash.surface_node_list, true)
+				biome_lib.pos_hash.action_index = biome_lib.pos_hash.action_index + 1
+			end
+		else
+			if biome_lib.actionslist_no_aircheck[biome_lib.pos_hash.action_index] then
+				added = biome_lib.populate_surfaces(
+							biome_lib.actionslist_no_aircheck[biome_lib.pos_hash.action_index][1],
+							biome_lib.actionslist_no_aircheck[biome_lib.pos_hash.action_index][2],
+							biome_lib.pos_hash.surface_node_list, false)
+				biome_lib.pos_hash.action_index = biome_lib.pos_hash.action_index + 1
+			end
+		end
+		if added > 0 then
+			biome_lib.dbg("biome_lib.populate_surfaces ran on mapblock at "..
+				minetest.pos_to_string(minp)..".  Entry #"..
+				(biome_lib.pos_hash.action_index-1).." added "..added.." items.", 4)
+		end
+	end
+end
+
+-- The spawning ABM
+
+function biome_lib.register_active_spawner(sd,sp,sr,sc,ss,sa)
+
+	local b = {}
+
+	if type(sd) ~= "table" then
+		b.spawn_delay = sd	-- old api expects ABM interval param here.
+		b.spawn_plants = {sp}
+		b.avoid_radius = sr
+		b.spawn_chance = sc
+		b.spawn_surfaces = {ss}
+		b.avoid_nodes = sa
+	else
+		b = sd
+	end
+
+	if b.spawn_delay*biome_lib.time_scale >= 1 then
+		b.interval = b.spawn_delay*biome_lib.time_scale
+	else
+		b.interval = 1
+	end
+
+	local biome = biome_lib.set_defaults(b)
+
+	biome.spawn_plants_count = #(biome.spawn_plants)
+
+	local n
+	if type(biome.spawn_plants) == "table" then
+		n = "random: "..biome.spawn_plants[1]..", ..."
+	else
+		n = biome.spawn_plants
+	end
+	biome.label = biome.label or "biome_lib spawn_on_surfaces(): "..n
+
+	minetest.register_abm({
+		nodenames = biome.spawn_surfaces,
+		interval = biome.interval,
+		chance = biome.spawn_chance,
+		neighbors = biome.neighbors,
+		label = biome.label,
+		action = function(pos, node, active_object_count, active_object_count_wider)
+			local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
+			local n_top = minetest.get_node(p_top)
+			local perlin_fertile_area = minetest.get_perlin(biome.seed_diff, biome_lib.fertile_perlin_octaves,
+					biome_lib.fertile_perlin_persistence, biome_lib.fertile_perlin_scale)
+
+			local fertility, temperature, humidity = get_biome_data(pos, perlin_fertile_area)
+
+			local pos_biome_ok = pos.y >= biome.min_elevation and pos.y <= biome.max_elevation
+				and fertility > biome.plantlife_limit
+				and temperature <= biome.temp_min and temperature >= biome.temp_max
+				and humidity <= biome.humidity_min and humidity >= biome.humidity_max
+				and biome_lib.is_node_loaded(p_top)
+
+			if not pos_biome_ok then
+				return -- Outside of biome
+			end
+
+			local n_light = minetest.get_node_light(p_top, nil)
+			if n_light < biome.light_min or n_light > biome.light_max then
+				return -- Too dark or too bright
+			end
+
+			if biome.avoid_nodes and biome.avoid_radius and minetest.find_node_near(
+					p_top, biome.avoid_radius + math.random(-1.5,2), biome.avoid_nodes) then
+				return -- Nodes to avoid are nearby
+			end
+
+			if biome.neighbors and biome.ncount and
+					#minetest.find_nodes_in_area(
+						{x=pos.x-1, y=pos.y, z=pos.z-1},
+						{x=pos.x+1, y=pos.y, z=pos.z+1},
+						biome.neighbors
+					) <= biome.ncount then
+				return -- Near neighbour nodes are not present
+			end
+
+			local NEAR_DST = biome.near_nodes_size
+			if biome.near_nodes and biome.near_nodes_count and biome.near_nodes_size and
+					#minetest.find_nodes_in_area(
+						{x=pos.x-NEAR_DST, y=pos.y-biome.near_nodes_vertical, z=pos.z-NEAR_DST},
+						{x=pos.x+NEAR_DST, y=pos.y+biome.near_nodes_vertical, z=pos.z+NEAR_DST},
+						biome.near_nodes
+					) < biome.near_nodes_count then
+				return -- Far neighbour nodes are not present
+			end
+
+			if (biome.air_count and biome.air_size) and
+					#minetest.find_nodes_in_area(
+						{x=p_top.x-biome.air_size, y=p_top.y, z=p_top.z-biome.air_size},
+						{x=p_top.x+biome.air_size, y=p_top.y, z=p_top.z+biome.air_size},
+						"air"
+					) < biome.air_count then
+				return -- Not enough air
+			end
+
+			local walldir = biome_lib.find_adjacent_wall(p_top, biome.verticals_list, biome.choose_random_wall)
+			if biome.alt_wallnode and walldir then
+				if n_top.name == "air" then
+					minetest.swap_node(p_top, { name = biome.alt_wallnode, param2 = walldir })
+				end
+				return
+			end
+
+			local currentsurface = minetest.get_node(pos).name
+
+			if biome_lib.default_water_nodes[currentsurface] and
+					#minetest.find_nodes_in_area(
+						{x=pos.x, y=pos.y-biome.depth_max-1, z=pos.z},
+						vector.new(pos),
+						biome_lib.default_wet_surfaces
+					) == 0 then
+				return -- On water but no ground nearby
+			end
+
+			local rnd = math.random(1, biome.spawn_plants_count)
+			local plant_to_spawn = biome.spawn_plants[rnd]
+			local fdir = biome.facedir
+			if biome.random_facedir then
+				fdir = math.random(biome.random_facedir[1],biome.random_facedir[2])
+			end
+			if type(biome.spawn_plants) == "string" then
+				assert(loadstring(biome.spawn_plants.."(...)"))(pos)
+			elseif not biome.spawn_on_side and not biome.spawn_on_bottom and not biome.spawn_replace_node then
+				if n_top.name == "air" then
+					minetest.swap_node(p_top, { name = plant_to_spawn, param2 = fdir })
+				end
+			elseif biome.spawn_replace_node then
+				minetest.swap_node(pos, { name = plant_to_spawn, param2 = fdir })
+
+			elseif biome.spawn_on_side then
+				local onside = biome_lib.find_open_side(pos)
+				if onside then
+					minetest.swap_node(onside.newpos, { name = plant_to_spawn, param2 = onside.facedir })
+				end
+			elseif biome.spawn_on_bottom then
+				if minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name == "air" then
+					minetest.swap_node({x=pos.x, y=pos.y-1, z=pos.z}, { name = plant_to_spawn, param2 = fdir} )
+				end
+			end
+		end
+	})
+end
+
+-- Function to decide how to replace a plant - either grow it, replace it with
+-- a tree, run a function, or die with an error.
+
+function biome_lib.replace_plant(pos, replacement, grow_function, walldir, seeddiff)
+	local growtype = type(grow_function)
+	if growtype == "table" then
+		minetest.swap_node(pos, biome_lib.air)
+		biome_lib.grow_ltree(pos, grow_function)
+		return
+	elseif growtype == "function" then
+		local perlin_fertile_area = minetest.get_perlin(seeddiff, biome_lib.fertile_perlin_octaves,
+				biome_lib.fertile_perlin_persistence, biome_lib.fertile_perlin_scale)
+		local fertility, temperature, _ = get_biome_data(pos, perlin_fertile_area)
+		grow_function(pos, fertility, temperature, walldir)
+		return
+	elseif growtype == "string" then
+		local perlin_fertile_area = minetest.get_perlin(seeddiff, biome_lib.fertile_perlin_octaves,
+				biome_lib.fertile_perlin_persistence, biome_lib.fertile_perlin_scale)
+		local fertility, temperature, _ = get_biome_data(pos, perlin_fertile_area)
+		assert(loadstring(grow_function.."(...)"))(pos, fertility, temperature, walldir)
+		return
+	elseif growtype == "nil" then
+		minetest.swap_node(pos, { name = replacement, param2 = walldir})
+		return
+	elseif growtype ~= "nil" and growtype ~= "string" and growtype ~= "table" then
+		error("Invalid grow function "..dump(grow_function).." used on object at ("..dump(pos)..")")
+	end
+end
+
+-- Check for infinite stacks
+
+if minetest.get_modpath("unified_inventory") or not minetest.settings:get_bool("creative_mode") then
+	biome_lib.expect_infinite_stacks = false
+else
+	biome_lib.expect_infinite_stacks = true
+end
+
+-- read a field from a node's definition
+
+function biome_lib.get_nodedef_field(nodename, fieldname)
+	if not minetest.registered_nodes[nodename] then
+		return nil
+	end
+	return minetest.registered_nodes[nodename][fieldname]
+end

block_queue_checks.lua

@@ -0,0 +1,141 @@
+-- Iterate through the mapblock log,
+-- populating blocks with new stuff in the process.
+
+minetest.register_globalstep(function(dtime)
+	if not biome_lib.block_log[1] then return end -- the block log is empty
+
+	if math.random(100) > biome_lib.queue_ratio then return end
+	for s = 1, biome_lib.entries_per_step do
+		biome_lib.generate_block()
+	end
+end)
+
+-- Periodically wake-up the queue to give old blocks a chance to time-out
+-- if the player isn't currently exploring (i.e. they're just playing in one area)
+
+function biome_lib.wake_up_queue()
+	if #biome_lib.block_recheck_list > 1
+	  and #biome_lib.block_log == 0 then
+		biome_lib.block_log[#biome_lib.block_log + 1] =
+			table.copy(biome_lib.block_recheck_list[#biome_lib.block_recheck_list])
+		biome_lib.block_recheck_list[#biome_lib.block_recheck_list] = nil
+		biome_lib.run_block_recheck_list = true
+		biome_lib.dbg("Woke-up the map queue to give old blocks a chance to time-out.", 3)
+	end
+	minetest.after(biome_lib.block_queue_wakeup_time, biome_lib.wake_up_queue)
+end
+
+biome_lib.wake_up_queue()
+
+-- Play out the entire log all at once on shutdown
+-- to prevent unpopulated map areas
+
+local function format_time(t)
+	if t > 59999999 then
+		return os.date("!%M minutes and %S seconds", math.ceil(t/1000000))
+	else
+		return os.date("!%S seconds", math.ceil(t/1000000))
+	end
+end
+
+function biome_lib.check_remaining_time()
+	if minetest.get_us_time() > (biome_lib.shutdown_last_timestamp + 10000000) then -- report progress every 10s
+		biome_lib.shutdown_last_timestamp = minetest.get_us_time()
+
+		local entries_remaining = #biome_lib.block_log + #biome_lib.block_recheck_list
+
+		local total_purged = biome_lib.starting_count - entries_remaining
+		local elapsed_time = biome_lib.shutdown_last_timestamp - biome_lib.shutdown_start_time
+		biome_lib.dbg(string.format("%i entries, approximately %s remaining.",
+			entries_remaining, format_time(elapsed_time/total_purged * entries_remaining)))
+	end
+end
+
+--Purge the block log at shutdown
+
+minetest.register_on_shutdown(function()
+
+	biome_lib.shutdown_start_time = minetest.get_us_time()
+	biome_lib.shutdown_last_timestamp = minetest.get_us_time()+1
+
+	biome_lib.starting_count = #biome_lib.block_log + #biome_lib.block_recheck_list
+
+	if biome_lib.starting_count == 0 then
+		return
+	end
+
+	biome_lib.dbg("Stand by, purging the mapblock log "..
+		"(there are "..biome_lib.starting_count.." entries) ...", 0)
+
+	while #biome_lib.block_log > 0 do
+		biome_lib.generate_block(true)
+		biome_lib.check_remaining_time()
+	end
+
+	if #biome_lib.block_recheck_list > 0 then
+		biome_lib.block_log = table.copy(biome_lib.block_recheck_list)
+		biome_lib.block_recheck_list = {}
+		while #biome_lib.block_log > 0 do
+			biome_lib.generate_block(true)
+			biome_lib.check_remaining_time()
+		end
+	end
+	biome_lib.dbg("Log purge completed after "..
+		format_time(minetest.get_us_time() - biome_lib.shutdown_start_time)..".", 0)
+end)
+
+-- "Record" the map chunks being generated by the core mapgen,
+-- split into individual mapblocks to reduce lag
+
+minetest.register_on_generated(function(minp, maxp, blockseed)
+	local timestamp = minetest.get_us_time()
+	for y = 0, 4 do
+		local miny = minp.y + y*16
+
+		if miny >= biome_lib.mapgen_elevation_limit.min
+		  and (miny + 15) <= biome_lib.mapgen_elevation_limit.max then
+
+			for x = 0, 4 do
+				local minx = minp.x + x*16
+
+				for z = 0, 4 do
+					local minz = minp.z + z*16
+
+					local bmin = {x=minx, y=miny, z=minz}
+					local bmax = {x=minx + 15, y=miny + 15, z=minz + 15}
+					biome_lib.block_log[#biome_lib.block_log + 1] = { bmin, bmax, true, timestamp }
+					biome_lib.block_log[#biome_lib.block_log + 1] = { bmin, bmax, false, timestamp }
+				end
+			end
+		else
+			biome_lib.dbg("Did not enqueue mapblocks at elevation "..miny..
+					"m, they're out of range of any generate_plant() calls.", 4)
+		end
+	end
+	biome_lib.run_block_recheck_list = true
+end)
+
+if biome_lib.debug_log_level >= 3 then
+	biome_lib.last_count = 0
+
+	function biome_lib.show_pending_block_count()
+		if biome_lib.last_count ~= #biome_lib.block_log then
+			biome_lib.dbg(string.format("Pending block counts - ready to process: %-8icurrently deferred: %i",
+				#biome_lib.block_log, #biome_lib.block_recheck_list), 3)
+			biome_lib.last_count = #biome_lib.block_log
+			biome_lib.queue_idle_flag = false
+		elseif not biome_lib.queue_idle_flag then
+			if #biome_lib.block_recheck_list > 0 then
+				biome_lib.dbg("Mapblock queue only contains blocks that can't yet be processed.",  3)
+				biome_lib.dbg("Idling the queue until new blocks arrive or the next wake-up call occurs.",  3)
+			else
+				biome_lib.dbg("Mapblock queue has run dry.",  3)
+				biome_lib.dbg("Idling the queue until new blocks arrive.",  3)
+			end
+			biome_lib.queue_idle_flag = true
+		end
+		minetest.after(1, biome_lib.show_pending_block_count)
+	end
+
+	biome_lib.show_pending_block_count()
+end

compat.lua

@@ -0,0 +1,115 @@
+-- compatibility shims for old mods
+
+function biome_lib:register_generate_plant(b, n)
+	biome_lib.dbg("Warning: biome_lib:register_generate_plant() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.register_on_generate() instead", 2)
+	biome_lib.dbg("Item: "..dump(n), 2)
+	biome_lib.register_on_generate(b, n)
+end
+
+function biome_lib:spawn_on_surfaces(sd, sp, sr, sc, ss, sa)
+	biome_lib.dbg("Warning: biome_lib:spawn_on_surfaces() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.register_active_spawner() instead.", 2)
+	biome_lib.dbg("Item: "..dump(sd.spawn_plants or sp[1] or sp), 2)
+	biome_lib.register_active_spawner(sd, sp, sr, sc, ss, sa)
+end
+
+function biome_lib:replace_object(p, r, f, w, d)
+	biome_lib.dbg("Warning: biome_lib:replace_object() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.replace_plant() instead.", 2)
+	biome_lib.dbg("Item: "..dump(r), 2)
+	biome_lib.replace_plant(p, r, f, w, d)
+end
+
+function biome_lib:grow_plants(o)
+	biome_lib.dbg("Warning: biome_lib:grow_plants() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.update_plant() instead.", 2)
+	biome_lib.dbg("Item: "..dump(o.grow_nodes), 2)
+	biome_lib.update_plant(o)
+end
+
+function biome_lib.generate_ltree(p, n)
+	minetest.spawn_tree(p, n)
+end
+
+function biome_lib.grow_ltree(p, n)
+	minetest.spawn_tree(p, n)
+end
+
+function biome_lib:generate_tree(p, n)
+	biome_lib.dbg("Warning: biome_lib:generate_tree() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.generate_ltree() instead.", 2)
+	biome_lib.dbg("Item: "..dump(n), 2)
+	biome_lib.generate_ltree(p, n)
+end
+
+function biome_lib:grow_tree(p, n)
+	biome_lib.dbg("Warning: biome_lib:grow_tree() is deprecated!", 2)
+	biome_lib.dbg("Use biome_lib.grow_ltree() instead.", 2)
+	biome_lib.dbg("Item: "..dump(n), 2)
+	biome_lib.grow_ltree(p, n)
+end
+
+function biome_lib.can_use_decorations(b, nodes_or_function_or_treedef)
+	if not b or not nodes_or_function_or_treedef
+	  or b.below_nodes
+	  or b.avoid_nodes
+	  or b.avoid_radius
+	  or b.neighbors
+	  or b.ncount
+	  or b.depth
+	  or b.near_nodes_size
+	  or b.near_nodes_vertical
+	  or b.temp_min
+	  or b.temp_max
+	  or b.verticals_list
+	  or b.delete_above
+	  or b.delete_above_surround
+	  or ( type(nodes_or_function_or_treedef) == "string" and not minetest.registered_nodes[nodes_or_function_or_treedef] )
+	  or ( type(nodes_or_function_or_treedef) == "table" and nodes_or_function_or_treedef.axiom )
+	  or type(nodes_or_function_or_treedef) == "function"
+		then return false
+	end
+
+	local biome = biome_lib.set_defaults(b)
+
+	local decor_def = {
+		["deco_type"] = "simple",
+		["flags"] = "all_floors",
+		["decoration"] = nodes_or_function_or_treedef,
+		["place_on"] = biome.surface,
+		["y_min"] = biome.min_elevation,
+		["y_max"] = biome.max_elevation,
+		["spawn_by"] = biome.near_nodes,
+		["num_spawn_by"] = biome.near_nodes and biome.near_nodes_count,
+	}
+
+	local r = (100-biome.rarity)/100
+	local mc = math.min(biome.max_count, 6400)/6400
+
+	decor_def.noise_params = {
+		octaves = biome_lib.fertile_perlin_octaves,
+		persist = biome_lib.fertile_perlin_persistence * (100/biome_lib.fertile_perlin_scale),
+		scale = math.min(r, mc),
+		seed = biome.seed_diff,
+		offset = 0,
+		spread = {x = 100, y = 100, z = 100},
+		lacunarity = 2,
+		flags = "absvalue"
+	}
+
+	if not b.check_air then
+		decor_def.flags = decor_def.flags..",force_placement"
+	end
+
+	if b.spawn_replace_node then
+		decor_def.place_offset_y = -1
+	end
+
+	if b.random_facedir then
+		decor_def.param2 =     math.min(b.random_facedir[1], b.random_facedir[2])
+		decor_def.param2_max = math.max(b.random_facedir[1], b.random_facedir[2])
+	end
+
+	return decor_def
+end

depends.txt

@@ -1,3 +0,0 @@
-default
-intllib?
-

description.txt

@@ -1 +0,0 @@
-The biome spawning and management library for Plantlife, Moretrees, Tiny Trees, and other mods that originally depended on plants_lib from the plantlife modpack.

growth.lua

@@ -0,0 +1,73 @@
+-- The growing ABM
+
+function biome_lib.check_surface(name, nodes)
+	if not nodes then return true end
+	if type(nodes) == "string" then return nodes == name end
+	if nodes.set and nodes[name] then
+		return true
+	else
+		for _, n in ipairs(nodes) do
+			if name == n then return true end
+		end
+	end
+	return false
+end
+
+function biome_lib.update_plant(opts)
+
+	local options = opts
+
+	options.height_limit = options.height_limit or 5
+	options.ground_nodes = options.ground_nodes or biome_lib.default_ground_nodes
+	options.grow_nodes = options.grow_nodes or biome_lib.default_grow_nodes
+	options.seed_diff = options.seed_diff or 0
+
+	local n
+
+	if type(options.grow_plant) == "table" then
+		n = "multi: "..options.grow_plant[1]..", ..."
+	else
+		n = options.grow_plant
+	end
+
+	options.label = options.label or "biome_lib.update_plant(): "..n
+
+	if options.grow_delay*biome_lib.time_scale >= 1 then
+		options.interval = options.grow_delay*biome_lib.time_scale
+	else
+		options.interval = 1
+	end
+
+	minetest.register_abm({
+		nodenames = { options.grow_plant },
+		interval = options.interval,
+		chance = options.grow_chance,
+		label = options.label,
+		action = function(pos, node, active_object_count, active_object_count_wider)
+			local p_top = {x=pos.x, y=pos.y+1, z=pos.z}
+			local p_bot = {x=pos.x, y=pos.y-1, z=pos.z}
+			local n_top = minetest.get_node(p_top)
+			local n_bot = minetest.get_node(p_bot)
+			local walldir = nil
+			if options.need_wall and options.verticals_list then
+				walldir = biome_lib.find_adjacent_wall(p_top, options.verticals_list, options.choose_random_wall)
+			end
+			if biome_lib.default_grow_through_nodes[n_top.name]
+			  and (not options.need_wall or (options.need_wall and walldir)) then
+				if options.grow_vertically and walldir then
+					if biome_lib.search_downward(pos, options.height_limit, options.ground_nodes) then
+						minetest.swap_node(p_top, { name = options.grow_plant, param2 = walldir})
+					end
+
+				elseif biome_lib.check_surface(n_bot.name, options.grow_nodes) then
+					if not options.grow_result and not options.grow_function then
+						minetest.swap_node(pos, biome_lib.air)
+
+					else
+						biome_lib.replace_plant(pos, options.grow_result, options.grow_function, options.facedir, options.seed_diff)
+					end
+				end
+			end
+		end
+	})
+end

init.lua

@@ -1,747 +1,95 @@
--- Biome library mod by Vanessa Ezekowitz
+-- Biome library mod by VanessaE
 --
 -- I got the temperature map idea from "hmmmm", values used for it came from
 -- Splizard's snow mod.
 --
 
--- Various settings - most of these probably won't need to be changed
-
 biome_lib = {}
-biome_lib.air = {name = "air"}
-
-plantslib = setmetatable({}, { __index=function(t,k) print("Use of deprecated function:", k) return biome_lib[k] end })
-
-biome_lib.blocklist_aircheck = {}
-biome_lib.blocklist_no_aircheck = {}
-
-biome_lib.surface_nodes_aircheck = {}
-biome_lib.surface_nodes_no_aircheck = {}
-
-biome_lib.surfaceslist_aircheck = {}
-biome_lib.surfaceslist_no_aircheck = {}
-
-biome_lib.actioncount_aircheck = {}
-biome_lib.actioncount_no_aircheck = {}
-
-biome_lib.actionslist_aircheck = {}
-biome_lib.actionslist_no_aircheck = {}
-
 biome_lib.modpath = minetest.get_modpath("biome_lib")
 
-biome_lib.total_no_aircheck_calls = 0
+local function tableize(s)
+	return string.split(string.trim(string.gsub(s, " ", "")))
+end
 
-biome_lib.queue_run_ratio = tonumber(minetest.settings:get("biome_lib_queue_run_ratio")) or 100
-
--- Boilerplate to support localized strings if intllib mod is installed.
-local S
-if minetest.global_exists("intllib") then
-	if intllib.make_gettext_pair then
-		S = intllib.make_gettext_pair()
-	else
-		S = intllib.Getter()
+local c1 = minetest.settings:get("biome_lib_default_grow_through_nodes")
+biome_lib.default_grow_through_nodes = {["air"] = true}
+if c1 then
+	for _, i in ipairs(tableize(c1)) do
+		biome_lib.default_grow_through_nodes[i] = true
 	end
 else
-	S = function(s) return s end
-end
-biome_lib.intllib = S
-
-local DEBUG = false --... except if you want to spam the console with debugging info :-)
-
-function biome_lib:dbg(msg)
-	if DEBUG then
-		print("[Plantlife] "..msg)
-		minetest.log("verbose", "[Plantlife] "..msg)
-	end
+	biome_lib.default_grow_through_nodes["default:snow"] = true
 end
 
-biome_lib.plantlife_seed_diff = 329	-- needs to be global so other mods can see it
-
-local perlin_octaves = 3
-local perlin_persistence = 0.6
-local perlin_scale = 100
-
-local temperature_seeddiff = 112
-local temperature_octaves = 3
-local temperature_persistence = 0.5
-local temperature_scale = 150
-
-local humidity_seeddiff = 9130
-local humidity_octaves = 3
-local humidity_persistence = 0.5
-local humidity_scale = 250
-
-local time_scale = 1
-local time_speed = tonumber(minetest.settings:get("time_speed"))
-
-if time_speed and time_speed > 0 then
-	time_scale = 72 / time_speed
-end
-
---PerlinNoise(seed, octaves, persistence, scale)
-
-biome_lib.perlin_temperature = PerlinNoise(temperature_seeddiff, temperature_octaves, temperature_persistence, temperature_scale)
-biome_lib.perlin_humidity = PerlinNoise(humidity_seeddiff, humidity_octaves, humidity_persistence, humidity_scale)
-
--- Local functions
-
-function biome_lib:is_node_loaded(node_pos)
-	local n = minetest.get_node_or_nil(node_pos)
-	if (not n) or (n.name == "ignore") then
-		return false
+local c2 = minetest.settings:get("biome_lib_default_water_nodes")
+biome_lib.default_water_nodes = {}
+if c2 then
+	for _, i in ipairs(tableize(c2)) do
+		biome_lib.default_water_nodes[i] = true
 	end
-	return true
-end
-
-function biome_lib:set_defaults(biome)
-	biome.seed_diff = biome.seed_diff or 0
-	biome.min_elevation = biome.min_elevation or -31000
-	biome.max_elevation = biome.max_elevation or 31000
-	biome.temp_min = biome.temp_min or 1
-	biome.temp_max = biome.temp_max or -1
-	biome.humidity_min = biome.humidity_min or 1
-	biome.humidity_max = biome.humidity_max or -1
-	biome.plantlife_limit = biome.plantlife_limit or 0.1
-	biome.near_nodes_vertical = biome.near_nodes_vertical or 1
-
--- specific to on-generate
-
-	biome.neighbors = biome.neighbors or biome.surface
-	biome.near_nodes_size = biome.near_nodes_size or 0
-	biome.near_nodes_count = biome.near_nodes_count or 1
-	biome.rarity = biome.rarity or 50
-	biome.max_count = biome.max_count or 5
-	if biome.check_air ~= false then biome.check_air = true end
-
--- specific to abm spawner
-	biome.seed_diff = biome.seed_diff or 0
-	biome.light_min = biome.light_min or 0
-	biome.light_max = biome.light_max or 15
-	biome.depth_max = biome.depth_max or 1
-	biome.facedir = biome.facedir or 0
-end
-
-local function search_table(t, s)
-	for i = 1, #t do
-		if t[i] == s then return true end
-	end
-	return false
-end
-
--- register the list of surfaces to spawn stuff on, filtering out all duplicates.
--- separate the items by air-checking or non-air-checking map eval methods
-
-function biome_lib:register_generate_plant(biomedef, nodes_or_function_or_model)
-
-	-- if calling code passes an undefined node for a surface or 
-	-- as a node to be spawned, don't register an action for it.
-
-	if type(nodes_or_function_or_model) == "string"
-	  and string.find(nodes_or_function_or_model, ":")
-	  and not minetest.registered_nodes[nodes_or_function_or_model] then
-		biome_lib:dbg("Warning: Ignored registration for undefined spawn node: "..dump(nodes_or_function_or_model))
-		return
-	end
-
-	if type(nodes_or_function_or_model) == "string"
-	  and not string.find(nodes_or_function_or_model, ":") then
-		biome_lib:dbg("Warning: Registered function call using deprecated string method: "..dump(nodes_or_function_or_model))
-	end
-
-	if biomedef.check_air == false then 
-		biome_lib:dbg("Register no-air-check mapgen hook: "..dump(nodes_or_function_or_model))
-		biome_lib.actionslist_no_aircheck[#biome_lib.actionslist_no_aircheck + 1] = { biomedef, nodes_or_function_or_model }
-		local s = biomedef.surface
-		if type(s) == "string" then
-			if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
-				if not search_table(biome_lib.surfaceslist_no_aircheck, s) then
-					biome_lib.surfaceslist_no_aircheck[#biome_lib.surfaceslist_no_aircheck + 1] = s
-				end
-			else
-				biome_lib:dbg("Warning: Ignored no-air-check registration for undefined surface node: "..dump(s))
-			end
-		else
-			for i = 1, #biomedef.surface do
-				local s = biomedef.surface[i]
-				if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
-					if not search_table(biome_lib.surfaceslist_no_aircheck, s) then
-						biome_lib.surfaceslist_no_aircheck[#biome_lib.surfaceslist_no_aircheck + 1] = s
-					end
-				else
-					biome_lib:dbg("Warning: Ignored no-air-check registration for undefined surface node: "..dump(s))
-				end
-			end
-		end
-	else
-		biome_lib:dbg("Register with-air-checking mapgen hook: "..dump(nodes_or_function_or_model))
-		biome_lib.actionslist_aircheck[#biome_lib.actionslist_aircheck + 1] = { biomedef, nodes_or_function_or_model }
-		local s = biomedef.surface
-		if type(s) == "string" then
-			if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
-				if not search_table(biome_lib.surfaceslist_aircheck, s) then
-					biome_lib.surfaceslist_aircheck[#biome_lib.surfaceslist_aircheck + 1] = s
-				end
-			else
-				biome_lib:dbg("Warning: Ignored with-air-checking registration for undefined surface node: "..dump(s))
-			end
-		else
-			for i = 1, #biomedef.surface do
-				local s = biomedef.surface[i]
-				if s and (string.find(s, "^group:") or minetest.registered_nodes[s]) then
-					if not search_table(biome_lib.surfaceslist_aircheck, s) then
-						biome_lib.surfaceslist_aircheck[#biome_lib.surfaceslist_aircheck + 1] = s
-					end
-				else
-					biome_lib:dbg("Warning: Ignored with-air-checking registration for undefined surface node: "..dump(s))
-				end
-			end
-		end
-	end
-end
-
-function biome_lib:populate_surfaces(biome, nodes_or_function_or_model, snodes, checkair)
-
-	biome_lib:set_defaults(biome)
-
-	-- filter stage 1 - find nodes from the supplied surfaces that are within the current biome.
-
-	local in_biome_nodes = {}
-	local perlin_fertile_area = minetest.get_perlin(biome.seed_diff, perlin_octaves, perlin_persistence, perlin_scale)
-
-	for i = 1, #snodes do
-		local pos = snodes[i]
-		local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
-		local noise1 = perlin_fertile_area:get2d({x=pos.x, y=pos.z})
-		local noise2 = biome_lib.perlin_temperature:get2d({x=pos.x, y=pos.z})
-		local noise3 = biome_lib.perlin_humidity:get2d({x=pos.x+150, y=pos.z+50})
-		local biome_surfaces_string = dump(biome.surface)
-		local surface_ok = false
-
-		if not biome.depth then
-			local dest_node = minetest.get_node(pos)
-			if string.find(biome_surfaces_string, dest_node.name) then
-				surface_ok = true
-			else
-				if string.find(biome_surfaces_string, "group:") then
-					for j = 1, #biome.surface do
-						if string.find(biome.surface[j], "^group:") 
-						  and minetest.get_item_group(dest_node.name, biome.surface[j]) then
-							surface_ok = true
-							break
-						end
-					end
-				end
-			end
-		elseif not string.find(biome_surfaces_string, minetest.get_node({ x = pos.x, y = pos.y-biome.depth-1, z = pos.z }).name) then
-			surface_ok = true
-		end
-
-		if surface_ok
-		  and pos.y >= biome.min_elevation
-		  and pos.y <= biome.max_elevation
-		  and noise1 > biome.plantlife_limit
-		  and noise2 <= biome.temp_min
-		  and noise2 >= biome.temp_max
-		  and noise3 <= biome.humidity_min
-		  and noise3 >= biome.humidity_max
-		  and (not checkair or minetest.get_node(p_top).name == "air")
-		  and (not biome.ncount or #(minetest.find_nodes_in_area({x=pos.x-1, y=pos.y, z=pos.z-1}, {x=pos.x+1, y=pos.y, z=pos.z+1}, biome.neighbors)) > biome.ncount)
-		  and (not biome.near_nodes or #(minetest.find_nodes_in_area({x=pos.x-biome.near_nodes_size, y=pos.y-biome.near_nodes_vertical, z=pos.z-biome.near_nodes_size}, {x=pos.x+biome.near_nodes_size, y=pos.y+biome.near_nodes_vertical, z=pos.z+biome.near_nodes_size}, biome.near_nodes)) >= biome.near_nodes_count)
-		  and math.random(1,100) > biome.rarity
-		  and (not biome.below_nodes or string.find(dump(biome.below_nodes), minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name) )
-		  then
-			in_biome_nodes[#in_biome_nodes + 1] = pos
-		end
-	end
-
-	-- filter stage 2 - find places within that biome area to place the plants.
-
-	local num_in_biome_nodes = #in_biome_nodes
-
-	if num_in_biome_nodes > 0 then
-		for i = 1, math.min(biome.max_count, num_in_biome_nodes) do
-			local tries = 0
-			local spawned = false
-			while tries < 2 and not spawned do
-				local pos = in_biome_nodes[math.random(1, num_in_biome_nodes)]
-				if biome.spawn_replace_node then
-					pos.y = pos.y-1
-				end
-				local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
-
-				if not (biome.avoid_nodes and biome.avoid_radius and minetest.find_node_near(p_top, biome.avoid_radius + math.random(-1.5,2), biome.avoid_nodes)) then
-					if biome.delete_above then
-						minetest.swap_node(p_top, biome_lib.air)
-						minetest.swap_node({x=p_top.x, y=p_top.y+1, z=p_top.z}, biome_lib.air)
-					end
-
-					if biome.delete_above_surround then
-						minetest.swap_node({x=p_top.x-1, y=p_top.y, z=p_top.z}, biome_lib.air)
-						minetest.swap_node({x=p_top.x+1, y=p_top.y, z=p_top.z}, biome_lib.air)
-						minetest.swap_node({x=p_top.x,   y=p_top.y, z=p_top.z-1}, biome_lib.air)
-						minetest.swap_node({x=p_top.x,   y=p_top.y, z=p_top.z+1}, biome_lib.air)
-
-						minetest.swap_node({x=p_top.x-1, y=p_top.y+1, z=p_top.z}, biome_lib.air)
-						minetest.swap_node({x=p_top.x+1, y=p_top.y+1, z=p_top.z}, biome_lib.air)
-						minetest.swap_node({x=p_top.x,   y=p_top.y+1, z=p_top.z-1}, biome_lib.air)
-						minetest.swap_node({x=p_top.x,   y=p_top.y+1, z=p_top.z+1}, biome_lib.air)
-					end
-
-					if biome.spawn_replace_node then
-						minetest.swap_node(pos, biome_lib.air)
-					end
-
-					local objtype = type(nodes_or_function_or_model)
-
-					if objtype == "table" then
-						if nodes_or_function_or_model.axiom then
-							biome_lib:generate_tree(p_top, nodes_or_function_or_model)
-							spawned = true
-						else
-							local fdir = nil
-							if biome.random_facedir then
-								fdir = math.random(biome.random_facedir[1], biome.random_facedir[2])
-							end
-							minetest.swap_node(p_top, { name = nodes_or_function_or_model[math.random(#nodes_or_function_or_model)], param2 = fdir })
-							spawned = true
-						end
-					elseif objtype == "string" and
-					  minetest.registered_nodes[nodes_or_function_or_model] then
-						local fdir = nil
-						if biome.random_facedir then
-							fdir = math.random(biome.random_facedir[1], biome.random_facedir[2])
-						end
-						minetest.swap_node(p_top, { name = nodes_or_function_or_model, param2 = fdir })
-						spawned = true
-					elseif objtype == "function" then
-						nodes_or_function_or_model(pos)
-						spawned = true
-					elseif objtype == "string" and pcall(loadstring(("return %s(...)"):
-						format(nodes_or_function_or_model)),pos) then
-						spawned = true
-					else
-						biome_lib:dbg("Warning: Ignored invalid definition for object "..dump(nodes_or_function_or_model).." that was pointed at {"..dump(pos).."}")
-					end
-				else
-					tries = tries + 1
-				end
-			end
-		end
-	end
-end
-
--- Primary mapgen spawner, for mods that can work with air checking enabled on
--- a surface during the initial map read stage.
-
-function biome_lib:generate_block_with_air_checking()
-	if #biome_lib.blocklist_aircheck > 0 then
-
-		local minp =		biome_lib.blocklist_aircheck[1][1]
-		local maxp =		biome_lib.blocklist_aircheck[1][2]
-
-		-- use the block hash as a unique key into the surface nodes
-		-- tables, so that we can write the tables thread-safely.
-
-		local blockhash =	minetest.hash_node_position(minp)
-
-		if not biome_lib.surface_nodes_aircheck.blockhash then
-
-			if type(minetest.find_nodes_in_area_under_air) == "function" then -- use newer API call
-				biome_lib.surface_nodes_aircheck.blockhash =
-					minetest.find_nodes_in_area_under_air(minp, maxp, biome_lib.surfaceslist_aircheck)
-			else
-				local search_area = minetest.find_nodes_in_area(minp, maxp, biome_lib.surfaceslist_aircheck)
-
-				-- search the generated block for air-bounded surfaces the slow way.
-
-				biome_lib.surface_nodes_aircheck.blockhash = {}
-
-				for i = 1, #search_area do
-				local pos = search_area[i]
-					local p_top = { x=pos.x, y=pos.y+1, z=pos.z }
-					if minetest.get_node(p_top).name == "air" then
-						biome_lib.surface_nodes_aircheck.blockhash[#biome_lib.surface_nodes_aircheck.blockhash + 1] = pos
-					end
-				end
-			end
-			biome_lib.actioncount_aircheck.blockhash = 1
-
-		else
-			if biome_lib.actioncount_aircheck.blockhash <= #biome_lib.actionslist_aircheck then
-				-- [1] is biome, [2] is node/function/model
-				biome_lib:populate_surfaces(
-					biome_lib.actionslist_aircheck[biome_lib.actioncount_aircheck.blockhash][1],
-					biome_lib.actionslist_aircheck[biome_lib.actioncount_aircheck.blockhash][2],
-					biome_lib.surface_nodes_aircheck.blockhash, true)
-				biome_lib.actioncount_aircheck.blockhash = biome_lib.actioncount_aircheck.blockhash + 1
-			else
-				if biome_lib.surface_nodes_aircheck.blockhash then
-					table.remove(biome_lib.blocklist_aircheck, 1)
-					biome_lib.surface_nodes_aircheck.blockhash = nil
-				end
-			end
-		end
-	end
-end
-
--- Secondary mapgen spawner, for mods that require disabling of
--- checking for air during the initial map read stage.
-
-function biome_lib:generate_block_no_aircheck()
-	if #biome_lib.blocklist_no_aircheck > 0 then
-
-		local minp =		biome_lib.blocklist_no_aircheck[1][1]
-		local maxp =		biome_lib.blocklist_no_aircheck[1][2]
-
-		local blockhash =	minetest.hash_node_position(minp)
-
-		if not biome_lib.surface_nodes_no_aircheck.blockhash then
-
-			-- directly read the block to be searched into the chunk cache
-
-			biome_lib.surface_nodes_no_aircheck.blockhash =
-				minetest.find_nodes_in_area(minp, maxp, biome_lib.surfaceslist_no_aircheck)
-			biome_lib.actioncount_no_aircheck.blockhash = 1
-
-		else
-			if biome_lib.actioncount_no_aircheck.blockhash <= #biome_lib.actionslist_no_aircheck then
-				biome_lib:populate_surfaces(
-					biome_lib.actionslist_no_aircheck[biome_lib.actioncount_no_aircheck.blockhash][1],
-					biome_lib.actionslist_no_aircheck[biome_lib.actioncount_no_aircheck.blockhash][2],
-					biome_lib.surface_nodes_no_aircheck.blockhash, false)
-				biome_lib.actioncount_no_aircheck.blockhash = biome_lib.actioncount_no_aircheck.blockhash + 1
-			else
-				if biome_lib.surface_nodes_no_aircheck.blockhash then
-					table.remove(biome_lib.blocklist_no_aircheck, 1)
-					biome_lib.surface_nodes_no_aircheck.blockhash = nil
-				end
-			end
-		end
-	end
-end
-
--- "Record" the chunks being generated by the core mapgen
-
-minetest.register_on_generated(function(minp, maxp, blockseed)
-	biome_lib.blocklist_aircheck[#biome_lib.blocklist_aircheck + 1] = { minp, maxp }
-end)
-
-minetest.register_on_generated(function(minp, maxp, blockseed)
-	biome_lib.blocklist_no_aircheck[#biome_lib.blocklist_no_aircheck + 1] = { minp, maxp }
-end)
-
--- "Play" them back, populating them with new stuff in the process
-
-minetest.register_globalstep(function(dtime)
-	if dtime < 0.2    -- don't attempt to populate if lag is already too high
-	  and math.random(100) <= biome_lib.queue_run_ratio
-	  and (#biome_lib.blocklist_aircheck > 0 or #biome_lib.blocklist_no_aircheck > 0) then
-		biome_lib.globalstep_start_time = minetest.get_us_time()
-		biome_lib.globalstep_runtime = 0
-		while (#biome_lib.blocklist_aircheck > 0 or #biome_lib.blocklist_no_aircheck > 0)
-		  and biome_lib.globalstep_runtime < 200000 do  -- 0.2 seconds, in uS.
-			if #biome_lib.blocklist_aircheck > 0 then
-				biome_lib:generate_block_with_air_checking()
-			end
-			if #biome_lib.blocklist_no_aircheck > 0 then
-				biome_lib:generate_block_no_aircheck()
-			end
-			biome_lib.globalstep_runtime = minetest.get_us_time() - biome_lib.globalstep_start_time
-		end
-	end
-end)
-
--- Play out the entire log all at once on shutdown
--- to prevent unpopulated map areas
-
-minetest.register_on_shutdown(function()
-	if #biome_lib.blocklist_aircheck > 0 then
-		print("[biome_lib] Stand by, playing out the rest of the aircheck mapblock log")
-		print("(there are "..#biome_lib.blocklist_aircheck.." entries)...")
-		while true do
-			biome_lib:generate_block_with_air_checking(0.1)
-			if #biome_lib.blocklist_aircheck == 0 then return end
-		end
-	end
-end)
-
-minetest.register_on_shutdown(function()
-	if #biome_lib.blocklist_no_aircheck > 0 then
-		print("[biome_lib] Stand by, playing out the rest of the no-aircheck mapblock log")
-		print("(there are "..#biome_lib.blocklist_no_aircheck.." entries)...")
-		while true do
-			biome_lib:generate_block_no_aircheck(0.1)
-			if #biome_lib.blocklist_no_aircheck == 0 then return end
-		end
-	end
-end)
-
--- The spawning ABM
-
-function biome_lib:spawn_on_surfaces(sd,sp,sr,sc,ss,sa)
-
-	local biome = {}
-
-	if type(sd) ~= "table" then
-		biome.spawn_delay = sd	-- old api expects ABM interval param here.
-		biome.spawn_plants = {sp}
-		biome.avoid_radius = sr
-		biome.spawn_chance = sc
-		biome.spawn_surfaces = {ss}
-		biome.avoid_nodes = sa
-	else
-		biome = sd
-	end
-
-	if biome.spawn_delay*time_scale >= 1 then
-		biome.interval = biome.spawn_delay*time_scale
-	else
-		biome.interval = 1
-	end
-
-	biome_lib:set_defaults(biome)
-	biome.spawn_plants_count = #(biome.spawn_plants)
-
-	minetest.register_abm({
-		nodenames = biome.spawn_surfaces,
-		interval = biome.interval,
-		chance = biome.spawn_chance,
-		neighbors = biome.neighbors,
-		action = function(pos, node, active_object_count, active_object_count_wider)
-			local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }	
-			local n_top = minetest.get_node(p_top)
-			local perlin_fertile_area = minetest.get_perlin(biome.seed_diff, perlin_octaves, perlin_persistence, perlin_scale)
-			local noise1 = perlin_fertile_area:get2d({x=p_top.x, y=p_top.z})
-			local noise2 = biome_lib.perlin_temperature:get2d({x=p_top.x, y=p_top.z})
-			local noise3 = biome_lib.perlin_humidity:get2d({x=p_top.x+150, y=p_top.z+50})
-			if noise1 > biome.plantlife_limit 
-			  and noise2 <= biome.temp_min
-			  and noise2 >= biome.temp_max
-			  and noise3 <= biome.humidity_min
-			  and noise3 >= biome.humidity_max
-			  and biome_lib:is_node_loaded(p_top) then
-				local n_light = minetest.get_node_light(p_top, nil)
-				if not (biome.avoid_nodes and biome.avoid_radius and minetest.find_node_near(p_top, biome.avoid_radius + math.random(-1.5,2), biome.avoid_nodes))
-				  and n_light >= biome.light_min
-				  and n_light <= biome.light_max
-				  and (not(biome.neighbors and biome.ncount) or #(minetest.find_nodes_in_area({x=pos.x-1, y=pos.y, z=pos.z-1}, {x=pos.x+1, y=pos.y, z=pos.z+1}, biome.neighbors)) > biome.ncount )
-				  and (not(biome.near_nodes and biome.near_nodes_count and biome.near_nodes_size) or #(minetest.find_nodes_in_area({x=pos.x-biome.near_nodes_size, y=pos.y-biome.near_nodes_vertical, z=pos.z-biome.near_nodes_size}, {x=pos.x+biome.near_nodes_size, y=pos.y+biome.near_nodes_vertical, z=pos.z+biome.near_nodes_size}, biome.near_nodes)) >= biome.near_nodes_count)
-				  and (not(biome.air_count and biome.air_size) or #(minetest.find_nodes_in_area({x=p_top.x-biome.air_size, y=p_top.y, z=p_top.z-biome.air_size}, {x=p_top.x+biome.air_size, y=p_top.y, z=p_top.z+biome.air_size}, "air")) >= biome.air_count)
-				  and pos.y >= biome.min_elevation
-				  and pos.y <= biome.max_elevation
-				  then
-					local walldir = biome_lib:find_adjacent_wall(p_top, biome.verticals_list, biome.choose_random_wall)
-					if biome.alt_wallnode and walldir then
-						if n_top.name == "air" then
-							minetest.swap_node(p_top, { name = biome.alt_wallnode, param2 = walldir })
-						end
-					else
-						local currentsurface = minetest.get_node(pos).name
-						if currentsurface ~= "default:water_source"
-						  or (currentsurface == "default:water_source" and #(minetest.find_nodes_in_area({x=pos.x, y=pos.y-biome.depth_max-1, z=pos.z}, {x=pos.x, y=pos.y, z=pos.z}, {"default:dirt", "default:dirt_with_grass", "default:sand"})) > 0 )
-						  then
-							local rnd = math.random(1, biome.spawn_plants_count)
-							local plant_to_spawn = biome.spawn_plants[rnd]
-							local fdir = biome.facedir
-							if biome.random_facedir then
-								fdir = math.random(biome.random_facedir[1],biome.random_facedir[2])
-							end
-							if type(biome.spawn_plants) == "string" then
-								assert(loadstring(biome.spawn_plants.."(...)"))(pos)
-							elseif not biome.spawn_on_side and not biome.spawn_on_bottom and not biome.spawn_replace_node then
-								if n_top.name == "air" then
-									minetest.swap_node(p_top, { name = plant_to_spawn, param2 = fdir })
-								end
-							elseif biome.spawn_replace_node then
-								minetest.swap_node(pos, { name = plant_to_spawn, param2 = fdir })
-
-							elseif biome.spawn_on_side then
-								local onside = biome_lib:find_open_side(pos)
-								if onside then 
-									minetest.swap_node(onside.newpos, { name = plant_to_spawn, param2 = onside.facedir })
-								end
-							elseif biome.spawn_on_bottom then
-								if minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name == "air" then
-									minetest.swap_node({x=pos.x, y=pos.y-1, z=pos.z}, { name = plant_to_spawn, param2 = fdir} )
-								end
-							end
-						end
-					end
-				end
-			end
-		end
-	})
-end
-
--- The growing ABM
-
-function biome_lib:grow_plants(opts)
-
-	local options = opts
-
-	options.height_limit = options.height_limit or 5
-	options.ground_nodes = options.ground_nodes or { "default:dirt_with_grass" }
-	options.grow_nodes = options.grow_nodes or { "default:dirt_with_grass" }
-	options.seed_diff = options.seed_diff or 0
-
-	if options.grow_delay*time_scale >= 1 then
-		options.interval = options.grow_delay*time_scale
-	else
-		options.interval = 1
-	end
-
-	minetest.register_abm({
-		nodenames = { options.grow_plant },
-		interval = options.interval,
-		chance = options.grow_chance,
-		action = function(pos, node, active_object_count, active_object_count_wider)
-			local p_top = {x=pos.x, y=pos.y+1, z=pos.z}
-			local p_bot = {x=pos.x, y=pos.y-1, z=pos.z}
-			local n_top = minetest.get_node(p_top)
-			local n_bot = minetest.get_node(p_bot)
-			local root_node = minetest.get_node({x=pos.x, y=pos.y-options.height_limit, z=pos.z})
-			local walldir = nil
-			if options.need_wall and options.verticals_list then
-				walldir = biome_lib:find_adjacent_wall(p_top, options.verticals_list, options.choose_random_wall)
-			end
-			if (n_top.name == "air" or n_top.name == "default:snow")
-			  and (not options.need_wall or (options.need_wall and walldir)) then
-				-- corner case for changing short junglegrass
-				-- to dry shrub in desert
-				if n_bot.name == options.dry_early_node and options.grow_plant == "junglegrass:short" then
-					minetest.swap_node(pos, { name = "default:dry_shrub" })
-
-				elseif options.grow_vertically and walldir then
-					if biome_lib:search_downward(pos, options.height_limit, options.ground_nodes) then
-						minetest.swap_node(p_top, { name = options.grow_plant, param2 = walldir})
-					end
-
-				elseif not options.grow_result and not options.grow_function then
-					minetest.swap_node(pos, biome_lib.air)
-
-				else
-					biome_lib:replace_object(pos, options.grow_result, options.grow_function, options.facedir, options.seed_diff)
-				end
-			end
-		end
-	})
-end
-
--- Function to decide how to replace a plant - either grow it, replace it with
--- a tree, run a function, or die with an error.
-
-function biome_lib:replace_object(pos, replacement, grow_function, walldir, seeddiff)
-	local growtype = type(grow_function)
-	if growtype == "table" then
-		minetest.swap_node(pos, biome_lib.air)
-		biome_lib:grow_tree(pos, grow_function)
-		return
-	elseif growtype == "function" then
-		local perlin_fertile_area = minetest.get_perlin(seeddiff, perlin_octaves, perlin_persistence, perlin_scale)
-		local noise1 = perlin_fertile_area:get2d({x=pos.x, y=pos.z})
-		local noise2 = biome_lib.perlin_temperature:get2d({x=pos.x, y=pos.z})
-		grow_function(pos,noise1,noise2,walldir)
-		return
-	elseif growtype == "string" then
-		local perlin_fertile_area = minetest.get_perlin(seeddiff, perlin_octaves, perlin_persistence, perlin_scale)
-		local noise1 = perlin_fertile_area:get2d({x=pos.x, y=pos.z})
-		local noise2 = biome_lib.perlin_temperature:get2d({x=pos.x, y=pos.z})
-		assert(loadstring(grow_function.."(...)"))(pos,noise1,noise2,walldir)
-		return
-	elseif growtype == "nil" then
-		minetest.swap_node(pos, { name = replacement, param2 = walldir})
-		return
-	elseif growtype ~= "nil" and growtype ~= "string" and growtype ~= "table" then
-		error("Invalid grow function "..dump(grow_function).." used on object at ("..dump(pos)..")")
-	end
-end
-
--- function to decide if a node has a wall that's in verticals_list{}
--- returns wall direction of valid node, or nil if invalid.
-
-function biome_lib:find_adjacent_wall(pos, verticals, randomflag)
-	local verts = dump(verticals)
-	if randomflag then
-		local walltab = {}
-		
-		if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z   }).name) then walltab[#walltab + 1] = 3 end
-		if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z   }).name) then walltab[#walltab + 1] = 2 end
-		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z-1 }).name) then walltab[#walltab + 1] = 5 end
-		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z+1 }).name) then walltab[#walltab + 1] = 4 end
-
-		if #walltab > 0 then return walltab[math.random(1, #walltab)] end
-
-	else
-		if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z   }).name) then return 3 end
-		if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z   }).name) then return 2 end
-		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z-1 }).name) then return 5 end
-		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z+1 }).name) then return 4 end
-	end
-	return nil
-end
-
--- Function to search downward from the given position, looking for the first
--- node that matches the ground table.  Returns the new position, or nil if
--- height limit is exceeded before finding it.
-
-function biome_lib:search_downward(pos, heightlimit, ground)
-	for i = 0, heightlimit do
-		if string.find(dump(ground), minetest.get_node({x=pos.x, y=pos.y-i, z = pos.z}).name) then
-			return {x=pos.x, y=pos.y-i, z = pos.z}
-		end
-	end
-	return false
-end
-
-function biome_lib:find_open_side(pos)
-	if minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name == "air" then
-		return {newpos = { x=pos.x-1, y=pos.y, z=pos.z }, facedir = 2}
-	end
-	if minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name == "air" then
-		return {newpos = { x=pos.x+1, y=pos.y, z=pos.z }, facedir = 3}
-	end
-	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z-1 }).name == "air" then
-		return {newpos = { x=pos.x, y=pos.y, z=pos.z-1 }, facedir = 4}
-	end
-	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z+1 }).name == "air" then
-		return {newpos = { x=pos.x, y=pos.y, z=pos.z+1 }, facedir = 5}
-	end
-	return nil
-end
-
--- spawn_tree() on generate is routed through here so that other mods can hook
--- into it.
-
-function biome_lib:generate_tree(pos, nodes_or_function_or_model)
-	minetest.spawn_tree(pos, nodes_or_function_or_model)
-end
-
--- and this one's for the call used in the growing code
-
-function biome_lib:grow_tree(pos, nodes_or_function_or_model)
-	minetest.spawn_tree(pos, nodes_or_function_or_model)
-end
-
--- Check for infinite stacks
-
-if minetest.get_modpath("unified_inventory") or not minetest.settings:get_bool("creative_mode") then
-	biome_lib.expect_infinite_stacks = false
 else
-	biome_lib.expect_infinite_stacks = true
+	biome_lib.default_water_nodes["default:water_source"] = true
+	biome_lib.default_water_nodes["default:water_flowing"] = true
+	biome_lib.default_water_nodes["default:river_water_source"] = true
+	biome_lib.default_water_nodes["default:river_water_flowing"] = true
 end
 
--- read a field from a node's definition
+local c3 = minetest.settings:get("biome_lib_default_wet_surfaces")
+local c4 = minetest.settings:get("biome_lib_default_ground_nodes")
+local c5 = minetest.settings:get("biome_lib_default_grow_nodes")
 
-function biome_lib:get_nodedef_field(nodename, fieldname)
-	if not minetest.registered_nodes[nodename] then
-		return nil
+biome_lib.default_wet_surfaces = c3 and tableize(c3) or {"default:dirt", "default:dirt_with_grass", "default:sand"}
+biome_lib.default_ground_nodes = c4 and tableize(c4) or {"default:dirt_with_grass"}
+biome_lib.default_grow_nodes =   c5 and tableize(c5) or {"default:dirt_with_grass"}
+
+biome_lib.debug_log_level = tonumber(minetest.settings:get("biome_lib_debug_log_level")) or 0
+
+local rr = tonumber(minetest.settings:get("biome_lib_queue_ratio")) or -200
+biome_lib.queue_ratio = 100 - rr
+biome_lib.entries_per_step = math.max(-rr, 1)
+
+-- the timer that manages the block timeout is in microseconds, but the timer
+-- that manages the queue wakeup call has to be in seconds, and works best if
+-- it takes a fraction of the block timeout interval.
+
+local t = tonumber(minetest.settings:get("biome_lib_block_timeout")) or 300
+
+biome_lib.block_timeout = t * 1000000
+
+-- we don't want the wakeup function to trigger TOO often,
+-- in case the user's block timeout setting is really low
+
+biome_lib.block_queue_wakeup_time = math.min(t/2, math.max(20, t/10))
+
+-- the actual important stuff starts here ;-)
+
+dofile(biome_lib.modpath .. "/api.lua")
+dofile(biome_lib.modpath .. "/search_functions.lua")
+dofile(biome_lib.modpath .. "/growth.lua")
+dofile(biome_lib.modpath .. "/compat.lua")
+
+minetest.after(0.01, function()
+	-- report the final registration results and enable the active block queue stuff
+
+	local n = #biome_lib.actionslist_aircheck + #biome_lib.actionslist_no_aircheck
+
+	biome_lib.dbg("All mapgen registrations completed.", 0)
+
+	if n > 0 then
+		biome_lib.dbg("Total items/actions to handle manually: "..n..
+				" ("..#biome_lib.actionslist_no_aircheck.." without air checks)", 0)
+		biome_lib.dbg("Total surface types to handle manually: "
+				..#biome_lib.surfaceslist_aircheck + #biome_lib.surfaceslist_no_aircheck, 0)
+	else
+		biome_lib.dbg("There are no \"handle manually\" items/actions registered,", 0)
+		biome_lib.dbg("so the mapblock queue will not be used this session.", 0)
 	end
-	return minetest.registered_nodes[nodename][fieldname]
-end
 
-print("[Biome Lib] Loaded")
+	biome_lib.dbg("Items sent to the engine's decorations handler: "..#biome_lib.registered_decorations, 0)
+	biome_lib.dbg("Elevation range: "..biome_lib.mapgen_elevation_limit.min.." to "..
+			string.format("%+d", biome_lib.mapgen_elevation_limit.max).." meters.", 0)
 
-minetest.after(0, function()
-	print("[Biome Lib] Registered a total of "..(#biome_lib.surfaceslist_aircheck)+(#biome_lib.surfaceslist_no_aircheck).." surface types to be evaluated, spread")
-	print("[Biome Lib] across "..#biome_lib.actionslist_aircheck.." actions with air-checking and "..#biome_lib.actionslist_no_aircheck.." actions without.")
+	if n > 0 then
+		dofile(biome_lib.modpath .. "/block_queue_checks.lua")
+	end
 end)
-

locale/de.txt

@@ -1,5 +0,0 @@
-# Translation by Xanthin
-
-someone = jemand
-Sorry, %s owns that spot. = Entschuldige, %s gehoert diese Stelle.
-[Plantlife Library] Loaded = [Plantlife Library] Geladen

locale/fr.txt

@@ -1,5 +0,0 @@
-# Template
-
-someone = quelqu'un
-Sorry, %s owns that spot. = Désolé, %s possède cet endroit.
-[Plantlife Library] Loaded = [Librairie Plantlife] Chargée.

locale/ru.txt

@@ -1,5 +0,0 @@
-# Translation by inpos
-
-someone = кто-то 
-Sorry, %s owns that spot. = Извините, но %s уже является владельцем этой точки.
-[Plantlife Library] Loaded = [Plantlife Library] Загружена

locale/template.txt

@@ -1,5 +0,0 @@
-# Template
-
-someone = 
-Sorry, %s owns that spot. = 
-[Plantlife Library] Loaded = 

locale/tr.txt

@@ -1,5 +0,0 @@
-# Turkish translation by mahmutelmas06
-
-someone = birisi
-Sorry, %s owns that spot. = Üzgünüm, buranın sahibi %s.
-[Plantlife Library] Loaded = [Plantlife Library] yüklendi

mod.conf

@@ -1 +1,5 @@
 name = biome_lib
+title = Biome Library
+description = The biome spawning and management library for Plantlife, Moretrees, Tiny Trees, and other mods that originally depended on plants_lib from the plantlife modpack.
+optional_depends = default
+min_minetest_version = 5.2.0

search_functions.lua

@@ -0,0 +1,53 @@
+
+-- function to decide if a node has a wall that's in verticals_list{}
+-- returns wall direction of valid node, or nil if invalid.
+
+function biome_lib.find_adjacent_wall(pos, verticals, randomflag)
+	local verts = dump(verticals)
+	if randomflag then
+		local walltab = {}
+
+		if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z   }).name) then walltab[#walltab + 1] = 3 end
+		if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z   }).name) then walltab[#walltab + 1] = 2 end
+		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z-1 }).name) then walltab[#walltab + 1] = 5 end
+		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z+1 }).name) then walltab[#walltab + 1] = 4 end
+
+		if #walltab > 0 then return walltab[math.random(1, #walltab)] end
+
+	else
+		if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z   }).name) then return 3 end
+		if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z   }).name) then return 2 end
+		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z-1 }).name) then return 5 end
+		if string.find(verts, minetest.get_node({ x=pos.x  , y=pos.y, z=pos.z+1 }).name) then return 4 end
+	end
+	return nil
+end
+
+-- Function to search downward from the given position, looking for the first
+-- node that matches the ground table.  Returns the new position, or nil if
+-- height limit is exceeded before finding it.
+
+function biome_lib.search_downward(pos, heightlimit, ground)
+	for i = 0, heightlimit do
+		if string.find(dump(ground), minetest.get_node({x=pos.x, y=pos.y-i, z = pos.z}).name) then
+			return {x=pos.x, y=pos.y-i, z = pos.z}
+		end
+	end
+	return false
+end
+
+function biome_lib.find_open_side(pos)
+	if minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name == "air" then
+		return {newpos = { x=pos.x-1, y=pos.y, z=pos.z }, facedir = 2}
+	end
+	if minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name == "air" then
+		return {newpos = { x=pos.x+1, y=pos.y, z=pos.z }, facedir = 3}
+	end
+	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z-1 }).name == "air" then
+		return {newpos = { x=pos.x, y=pos.y, z=pos.z-1 }, facedir = 4}
+	end
+	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z+1 }).name == "air" then
+		return {newpos = { x=pos.x, y=pos.y, z=pos.z+1 }, facedir = 5}
+	end
+	return nil
+end

settingtypes.txt

@@ -0,0 +1,48 @@
+# Comma-separated list of things that a spawned node is allowed to grow
+# through.  Air is always added to whatever else you specify here.
+biome_lib_default_grow_through_nodes (List of things a plant can grow through) string default:snow
+
+# Comma-separated list of nodes that should be treated as water or water-like
+# for the sake of looking for neighboring wet ground.
+biome_lib_default_water_nodes (List of "water-like" sources) string default:water_source,default:water_flowing,default:river_water_source,default:river_water_flowing
+
+# Comma-separated list of nodes that should be considered "wet" if one of
+# the configured "water-like" sources is nearby.
+biome_lib_default_wet_surfaces (List of "wet" nodes) string default:dirt,default:dirt_with_grass,default:sand
+
+# Comma-separated list of nodes that something must be sitting on to be
+# able to actively change from one thing to another (such as a sapling
+# growing into a tree), to be used if the mod that added that growable
+# thing didn't provide its own list of suitable surfaces.
+biome_lib_default_grow_nodes (List of default surfaces a plant can thrive on) string default:dirt_with_grass
+
+# Comma-separated list of nodes to use as the "root" of something that can
+# gradually climb up a wall (such as ivy), to be used if the mod that added
+# the climing thing didn't provide its own list.
+biome_lib_default_ground_nodes (List of default root nodes) string default:dirt_with_grass
+
+# biome_lib divides its workload into "actions", as dictated by the sum
+# total of all mods that use it, and this sets how much of that work is done
+# per globalstep tick.  If positive, a single action is executed on that
+# percentage of ticks, on average. If negative, it becomes positive, and
+# that many actions are executed on every single tick, skipping none.
+# More negative means more throughput, at the expense of lag.  On fast PC's,
+# a setting of between -500 and -2000 might be good.
+biome_lib_queue_ratio (Queue run ratio) int -200
+
+# Minetest's map generator allows neighboring areas to overflow into one
+# another, to create smooth terrain, but it often hands the map blocks that
+# comprise those areas to Lua (and hence, to biome_lib) before that overflow
+# function happens, which causes the mapgen to overwrite whatever Lua does
+# to them.  This setting (in seconds) makes biome_lib wait before adding its
+# normal output to those map blocks, to give the engine plenty of time to
+# run that overflow feature first.
+biome_lib_block_timeout (Deferred block timeout) int 300
+
+# This does just what it sounds like - it shows all debug output that's sent
+# with a level equal to or greater than this value.  A setting of 0 shows only
+# the bare necessities, such as the startup and shutdown messages, 1 adds
+# internal non-fatal errors to what's shown, 2 adds warnings, 3 adds other
+# basic info, 4 adds all the verbose debugging spew. 3 is perhaps the most
+# useful setting.
+biome_lib_debug_log_level (Debug log level) int 0