finished splitting up the three components into separate folders, by moving

texture files to their respective components' folders (<f>/textures).  Also,
began working on extending the API for the growing code to allow for checking
for the height of a node.  Poisonivy is the only component that uses it for
now; this is more intended to be used with nature pack eventually.

API.txt

@@ -72,8 +72,9 @@ depthmax:   If a node spawns on top of a water source, the water must be at
 -----
 The second function, grow_plants() is defined like so:
 
-grow_plants = function(gdelay, gchance, gplant, gresult,
-	      dry_early_node, grow_nodes)
+grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node,
+		grow_nodes, facedir, need_wall, grow_vertically, height_limit,
+		ground_nodes)
 
 gdelay:          Passed as the ABM "interval" parameter, as with spawning.
 gchance:         Passed as the ABM "chance" parameter.
@@ -97,6 +98,19 @@ grow_nodes:	 This node must be under the plant in order for it to grow at
 facedir:	 Same as with spawning a plant.  If supplied, this value is
 		 passed to the param2 variable when changing the plant.  If nil
 		 or left out, no new param2 value is applied.
+need_wall:	 Set this to true if you the plant needs to grow against a
+		 wall.  Defaults to false.
+grow_vertically: Set this to true if the plant needs to grow vertically, as in
+		 climbing poison ivy.  Defaults to false.
+height_limit:	 Just how tall can a vertically-growing plant go?  Set this
+		 accordingly.  The mod will search straight down from the
+		 position being spawned at to find a ground node, below.
+		 Defaults to 62000 (unlimited).
+ground_nodes:	 What nodes should be treated as "the ground" below a
+		 vertically-growing plant.  Usually this will be the same as
+		 the grow_nodes table, but might also include, for example,
+		 water or some other surrounding material.  Defaults to 
+		 "default:dirt_with_grass".
 
 -----
 plant_valid_wall() expects only a single parameter, "pos", which is a table

plants_lib/init.lua

@@ -90,7 +90,11 @@ end
 
 -- The growing ABM
 
-grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, grow_nodes, facedir)
+grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, grow_nodes, facedir, need_wall, grow_vertically, height_limit, ground_nodes)
+	if need_wall ~= true then need_wall = false end
+	if grow_vertically ~= true then grow_vertically = false end
+	if height_limit == nil then height_limit = 62000 end
+	if ground_node == nil then ground_nodes = { "default:dirt_with_grass" } end
 	minetest.register_abm({
 		nodenames = { gplant },
 		interval = gdelay,
@@ -100,15 +104,21 @@ grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, grow_no
 			local p_bot = {x=pos.x, y=pos.y-1, z=pos.z}
 			local n_top = minetest.env:get_node(p_top)
 			local n_bot = minetest.env:get_node(p_bot)
+			local groundnode = minetest.env:get_node({x=pos.x, y=pos.y-height_limit, z=pos.z})
 
 			if string.find(dump(grow_nodes), n_bot.name) ~= nil and n_top.name == "air" then
-
-				-- corner case for wall-climbing poison ivy
-				if gplant == "poisonivy:climbing" then
-					local walldir=plant_valid_wall(p_top)
-					if walldir ~= nil then
-						dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
-						minetest.env:add_node(p_top, { name = gplant, param2 = walldir })
+				if grow_vertically then
+					if find_first_node(pos, height_limit, ground_nodes) ~= nil then
+						if need_wall then
+							local walldir=plant_valid_wall(p_top)
+							if walldir ~= nil then
+								dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..") on wall "..walldir)
+								minetest.env:add_node(p_top, { name = gplant, param2 = walldir })
+							end
+						else
+							dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
+							minetest.env:add_node(p_top, { name = gplant })
+						end
 					end
 
 				-- corner case for changing short junglegrass to dry shrub in desert
@@ -155,6 +165,19 @@ plant_valid_wall = function(wallpos)
 	return walldir
 end
 
+-- Function to search straight down from (pos) to find first node in match list.
+
+find_first_node = function(pos, height_limit, nodelist)
+	for i = 1, height_limit do
+		n = minetest.env:get_node({x=pos.x, y=pos.y-i, z=pos.z})
+		if string.find(dump(nodelist),n.name) ~= nil then
+			return n.name
+		end
+	end
+	return nil
+end
+
+
 local enstr = ""
 
 if enabled_flowers then enstr = enstr.." flowers" end

poinsonivy/init.lua

@@ -63,7 +63,9 @@ minetest.register_node(':poisonivy:climbing', {
 })
 
 spawn_on_surfaces(spawn_delay, "poisonivy:seedling", 10 , spawn_chance/10, "default:dirt_with_grass", {"group:poisonivy","group:flower"}, poisonivy_seed_diff, 7)
+
 grow_plants(spawn_delay, grow_chance,   "poisonivy:seedling", "poisonivy:sproutling", nil, {"default:dirt_with_grass"})
-grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing", nil,                    nil, nil)
+
+grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing", nil,                    nil, nil                        ,nil,true,true,nil,{"default:dirt_with_grass"})
 
 enabled_poisonivy = true