add growing tree nodes.

add `log_alive` and `leaves_alive`. make alive logs actually have a top
texture (bottom texture and dead logs are still wrong, though).

slightly refactor some tree growth code.

mods/bg_tree/grow.lua

@@ -2,6 +2,16 @@ local modname = minetest.get_current_modname()
 local api = blockgame.tree
 local vec = blockgame.vector
 
+-- NODE NAMES
+
+local log = modname .. ":log"
+local log_alive = modname .. ":log_alive"
+local leaves = modname .. ":leaves"
+local leaves_alive = modname .. ":leaves_alive"
+local root = modname .. ":root"
+
+-- END OF NODE NAMES
+
 local attempt_place = function (pos, node)
 	if minetest.get_node(pos).name ~= "air" then return false end
 	return minetest.set_node(pos, node)
@@ -10,7 +20,7 @@ end
 
 local extend_leaves_from = function (pos)
 	local side = vec.random_side()
-	attempt_place(pos + side, {name = modname .. ":leaves"})
+	attempt_place(pos + side, {name = leaves_alive})
 end
 
 local random_walk = function (pos, steps, check)
@@ -27,15 +37,15 @@ end
 
 local spread_roots_from = function (source)
 	local root_pos = random_walk(source, 2, function (pos)
-		if minetest.get_node(pos).name == modname .. ":log" then return true end
-		if minetest.get_node(pos).name == modname .. ":root" then return true end
+		if minetest.get_node(pos).name == log_alive then return true end
+		if minetest.get_node(pos).name == root then return true end
 		return false
 	end)
 
 	local root_node = minetest.get_node(root_pos)
 
-	if minetest.get_node(root_pos + vector.new(0, 1, 0)).name == modname .. ":log" then
-		minetest.set_node(root_pos, {name = modname .. ":root"})
+	if minetest.get_node(root_pos + vector.new(0, 1, 0)).name == log_alive then
+		minetest.set_node(root_pos, {name = root})
 		return true
 	end
 
@@ -44,7 +54,7 @@ local spread_roots_from = function (source)
 	if blockgame.chance(2) then target_pos = vec.get_below(root_pos) end
 
 	if minetest.get_item_group(minetest.get_node(target_pos), "dirty") then
-		return minetest.set_node(target_pos, {name = modname .. ":root"})
+		return minetest.set_node(target_pos, {name = root})
 	end
 
 	return false
@@ -53,7 +63,7 @@ end
 minetest.register_abm({
 	label = "sapling grow",
 	nodenames = {"tree:sapling"},
-	neighbors = {"group:dirty", modname .. ":log"},
+	neighbors = {"group:dirty", log_alive},
 	interval = 15,
 	chance = 4,
 	catch_up = true,
@@ -78,7 +88,7 @@ minetest.register_abm({
 			local side = vec.random_side()
 			local target = pos + side
 
-			attempt_place(target, {name = modname .. ":log"})
+			attempt_place(target, {name = log_alive})
 
 			if blockgame.chance(2) then
 				extend_leaves_from(target)
@@ -86,9 +96,9 @@ minetest.register_abm({
 		end
 
 		if blockgame.chance(4) then
-			minetest.set_node(pos, {name = modname .. ":log"})
+			minetest.set_node(pos, {name = log_alive})
 
-			if minetest.get_node(below).name == modname .. ":log" and blockgame.chance(2) then return end
+			if minetest.get_node(below).name == log_alive and blockgame.chance(2) then return end
 
 			attempt_place(pos + vector.new(0, 1, 0), {name = modname .. ":sapling"})
 		end

mods/bg_tree/node.lua

@@ -3,11 +3,24 @@ local modname = minetest.get_current_modname()
 blockgame.reg_simple_node("log", "Log", {
 	woody = 1,
 })
+minetest.register_node(modname .. ":log_alive", {
+	description = "Growing Log",
+	tiles = {
+		modname .. "_log_top.png",
+		modname .. "_log_alive.png",
+	},
+	groups = {
+		woody = 1,
+		planty = 1,
+	},
+	drop = modname .. ":log",
+})
 
 blockgame.reg_simple_node("sapling", "Sapling", {
 	planty = 1,
 })
 
+-- TODO: move this to the woodworking mod.
 blockgame.reg_simple_node("plank", "Plank", {
 	woody = 1,
 })
@@ -23,23 +36,19 @@ minetest.register_node(modname .. ":leaves", {
 	groups = {
 		planty = 1,
 	},
-	drop = {
-		max_items = 2,
-		items = {
-			{
-				rarity = 16,
-				items = {modname .. ":nut 3"}
-			},
-			{
-				rarity = 8,
-				items = {modname .. ":nut 2"}
-			},
-			{
-				rarity = 4,
-				items = {modname .. ":nut"}
-			},
-		},
+})
+minetest.register_node(modname .. ":leaves_alive", {
+	description = "Growing Leaves",
+	drawtype = "glasslike",
+	tiles = {
+		modname .. "_leaves_alive.png",
 	},
+	paramtype = "light",
+	sunlight_propagates = true,
+	groups = {
+		planty = 1,
+	},
+	drop = modname .. ":leaves",
 })
 
 blockgame.reg_simple_node("nut", "Nut", {

mods/bg_tree/recipes.lua

@@ -5,7 +5,6 @@ local modname = minetest.get_current_modname()
 blockgame.crafting.register_stack_recipe("core:grass", modname .. ":nut", {name = modname .. ":sapling"})
 blockgame.crafting.register_stack_recipe("core:dirt", modname .. ":nut", {name = modname .. ":sapling"})
 
--- NOTE: is currently useless, as there's no way to obtain leaves.
 blockgame.crafting.register_pummel_recipe({
 	label = "pummel leaves into dirt",
 	used_item = modname .. ":leaves",
@@ -15,6 +14,7 @@ blockgame.crafting.register_pummel_recipe({
 	end,
 })
 
+-- TODO: move this to the woodworking mod.
 blockgame.crafting.register_pummel_recipe({
 	label = "pummel log into plank",
 	used_item = "core:stone",