Initial prototype for tool heads.

They don't look right with the "signlike" render type.  May need
to find a way to allow a craftitem to be pummeled when in
"item node" form.

mods/nc_woodwork/toolhead.lua

@@ -1 +1,57 @@
+local modname = minetest.get_current_modname()
 
+local function toolhead(name, from, sticks)
+	local n = modname .. ":toolhead_" .. name:lower()
+	local t = n:gsub(":", "_") .. ".png"
+	minetest.register_node(n, {
+			description = name .. " Tool Head",
+			drawtype = "signlike",
+			tiles = { t },
+			inventory_image = t,
+			paramtype = "light",
+			paramtype2 = "wallmounted",
+			propagates_sunlight = true,
+			selection_box = {
+				type = "fixed",
+				fixed = { -7/16, -0.5, -7/16, 7/16, -7/16, 7/16 },
+			},
+			on_construct = function(pos, node)
+				node = node or minetest.get_node(pos)
+				if node.param2 ~= 1 then
+					node.param2 = 1
+					return minetest.set_node(pos, node)
+				end
+			end,
+			groups = {
+				crumbly = 3,
+				falling_node = 1,
+				falling_repose = 1,
+			}
+		})
+	nodecore.extend_node(from, function(copy, orig)
+			local oc = orig.can_pummel or function() end
+			copy.can_pummel = function(pos, node, stats, ...)
+				if (stats.pointed.above.y - stats.pointed.under.y) == 1
+				and nodecore.wieldgroup(stats.puncher, "choppy") then
+					return n
+				end
+				return oc(pos, node, stats)
+			end
+			local op = orig.on_pummel or function() end
+			copy.on_pummel = function(pos, node, stats, ...)
+				if stats.check ~= n or stats.duration < 5 then
+					return op(pos, node, stats, ...)
+				end
+				minetest.set_node(pos, {name = n, param2 = 1})
+				if sticks then
+					minetest.item_drop(ItemStack("nc_tree:stick " .. sticks), nil,
+						{x = pos.x, y = pos.y + 1, z = pos.z})
+				end
+				return true
+			end
+		end)
+end
+
+toolhead("Spade", modname .. ":plank", 1)
+toolhead("Axe", modname .. ":toolhead_spade")
+toolhead("Pick", modname .. ":toolhead_axe", 2)