"explode" all modpacks into their individual components

(you can't have a modpack buried inside a modpack)

2 files changed, 239 insertions, 0 deletions

diff --git a/mesecons_mvps/depends.txt b/mesecons_mvps/depends.txt
new file mode 100644
index 0000000..acaa924
--- /dev/null
+++ b/mesecons_mvps/depends.txt
@@ -0,0 +1 @@
+mesecons
diff --git a/mesecons_mvps/init.lua b/mesecons_mvps/init.lua
new file mode 100644
index 0000000..beec94b
--- /dev/null
+++ b/mesecons_mvps/init.lua
@@ -0,0 +1,238 @@
+--register stoppers for movestones/pistons
+
+mesecon.mvps_stoppers = {}
+mesecon.on_mvps_move = {}
+mesecon.mvps_unmov = {}
+
+--- Objects (entities) that cannot be moved
+function mesecon.register_mvps_unmov(objectname)
+	mesecon.mvps_unmov[objectname] = true;
+end
+
+function mesecon.is_mvps_unmov(objectname)
+	return mesecon.mvps_unmov[objectname]
+end
+
+-- Nodes that cannot be pushed / pulled by movestones, pistons
+function mesecon.is_mvps_stopper(node, pushdir, stack, stackid)
+	local get_stopper = mesecon.mvps_stoppers[node.name]
+	if type (get_stopper) == "function" then
+		get_stopper = get_stopper(node, pushdir, stack, stackid)
+	end
+	return get_stopper
+end
+
+function mesecon.register_mvps_stopper(nodename, get_stopper)
+	if get_stopper == nil then
+			get_stopper = true
+	end
+	mesecon.mvps_stoppers[nodename] = get_stopper
+end
+
+-- Functions to be called on mvps movement
+function mesecon.register_on_mvps_move(callback)
+	mesecon.on_mvps_move[#mesecon.on_mvps_move+1] = callback
+end
+
+local function on_mvps_move(moved_nodes)
+	for _, callback in ipairs(mesecon.on_mvps_move) do
+		callback(moved_nodes)
+	end
+end
+
+function mesecon.mvps_process_stack(stack)
+	-- update mesecons for placed nodes ( has to be done after all nodes have been added )
+	for _, n in ipairs(stack) do
+		mesecon.on_placenode(n.pos, minetest.get_node(n.pos))
+	end
+end
+
+function mesecon.mvps_get_stack(pos, dir, maximum, all_pull_sticky)
+	-- determine the number of nodes to be pushed
+	local nodes = {}
+	local frontiers = {pos}
+
+	while #frontiers > 0 do
+		local np = frontiers[1]
+		local nn = minetest.get_node(np)
+
+		if nn.name ~= "air"
+		and minetest.registered_nodes[nn.name]
+		and minetest.registered_nodes[nn.name].liquidtype == "none" then
+			table.insert(nodes, {node = nn, pos = np})
+			if #nodes > maximum then return nil end
+
+			-- add connected nodes to frontiers, connected is a vector list
+			-- the vectors must be absolute positions
+			local connected = {}
+			if minetest.registered_nodes[nn.name]
+			and minetest.registered_nodes[nn.name].mvps_sticky then
+				connected = minetest.registered_nodes[nn.name].mvps_sticky(np, nn)
+			end
+
+			table.insert(connected, vector.add(np, dir))
+
+			-- If adjacent node is sticky block and connects add that
+			-- position to the connected table
+			for _, r in ipairs(mesecon.rules.alldirs) do
+				local adjpos = vector.add(np, r)
+				local adjnode = minetest.get_node(adjpos)
+				if minetest.registered_nodes[adjnode.name]
+				and minetest.registered_nodes[adjnode.name].mvps_sticky then
+					local sticksto = minetest.registered_nodes[adjnode.name]
+						.mvps_sticky(adjpos, adjnode)
+
+					-- connects to this position?
+					for _, link in ipairs(sticksto) do
+						if vector.equals(link, np) then
+							table.insert(connected, adjpos)
+						end
+					end
+				end
+			end
+
+			if all_pull_sticky then
+				table.insert(connected, vector.subtract(np, dir))
+			end
+
+			-- Make sure there are no duplicates in frontiers / nodes before
+			-- adding nodes in "connected" to frontiers
+			for _, cp in ipairs(connected) do
+				local duplicate = false
+				for _, rp in ipairs(nodes) do
+					if vector.equals(cp, rp.pos) then
+						duplicate = true
+					end
+				end
+				for _, fp in ipairs(frontiers) do
+					if vector.equals(cp, fp) then
+						duplicate = true
+					end
+				end
+				if not duplicate then
+					table.insert(frontiers, cp)
+				end
+			end
+		end
+		table.remove(frontiers, 1)
+	end
+
+	return nodes
+end
+
+function mesecon.mvps_push(pos, dir, maximum)
+	return mesecon.mvps_push_or_pull(pos, dir, dir, maximum)
+end
+
+function mesecon.mvps_pull_all(pos, dir, maximum)
+	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum, true)
+end
+
+function mesecon.mvps_pull_single(pos, dir, maximum)
+	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum)
+end
+
+-- pos: pos of mvps; stackdir: direction of building the stack
+-- movedir: direction of actual movement
+-- maximum: maximum nodes to be pushed
+-- all_pull_sticky: All nodes are sticky in the direction that they are pulled from
+function mesecon.mvps_push_or_pull(pos, stackdir, movedir, maximum, all_pull_sticky)
+	local nodes = mesecon.mvps_get_stack(pos, movedir, maximum, all_pull_sticky)
+
+	if not nodes then return end
+	-- determine if one of the nodes blocks the push / pull
+	for id, n in ipairs(nodes) do
+		if mesecon.is_mvps_stopper(n.node, movedir, nodes, id) then
+			return
+		end
+	end
+
+	-- remove all nodes
+	for _, n in ipairs(nodes) do
+		n.meta = minetest.get_meta(n.pos):to_table()
+		minetest.remove_node(n.pos)
+	end
+
+	-- update mesecons for removed nodes ( has to be done after all nodes have been removed )
+	for _, n in ipairs(nodes) do
+		mesecon.on_dignode(n.pos, n.node)
+	end
+
+	-- add nodes
+	for _, n in ipairs(nodes) do
+		local np = mesecon.addPosRule(n.pos, movedir)
+
+		minetest.add_node(np, n.node)
+		minetest.get_meta(np):from_table(n.meta)
+	end
+
+	local moved_nodes = {}
+	local oldstack = mesecon.tablecopy(nodes)
+	for i in ipairs(nodes) do
+		moved_nodes[i] = {}
+		moved_nodes[i].oldpos = nodes[i].pos
+		nodes[i].pos = mesecon.addPosRule(nodes[i].pos, movedir)
+		moved_nodes[i].pos = nodes[i].pos
+		moved_nodes[i].node = nodes[i].node
+		moved_nodes[i].meta = nodes[i].meta
+	end
+
+	on_mvps_move(moved_nodes)
+
+	return true, nodes, oldstack
+end
+
+mesecon.register_on_mvps_move(function(moved_nodes)
+	for _, n in ipairs(moved_nodes) do
+		mesecon.on_placenode(n.pos, n.node)
+		mesecon.update_autoconnect(n.pos)
+	end
+end)
+
+function mesecon.mvps_move_objects(pos, dir, nodestack)
+	local objects_to_move = {}
+
+	-- Move object at tip of stack
+	local pushpos = mesecon.addPosRule(pos, -- get pos at tip of stack
+		{x = dir.x * #nodestack,
+		 y = dir.y * #nodestack,
+		 z = dir.z * #nodestack})
+
+
+	local objects = minetest.get_objects_inside_radius(pushpos, 1)
+	for _, obj in ipairs(objects) do
+		table.insert(objects_to_move, obj)
+	end
+
+	-- Move objects lying/standing on the stack (before it was pushed - oldstack)
+	if tonumber(minetest.setting_get("movement_gravity")) > 0 and dir.y == 0 then
+		-- If gravity positive and dir horizontal, push players standing on the stack
+		for _, n in ipairs(nodestack) do
+			local p_above = mesecon.addPosRule(n.pos, {x=0, y=1, z=0})
+			local objects = minetest.get_objects_inside_radius(p_above, 1)
+			for _, obj in ipairs(objects) do
+				table.insert(objects_to_move, obj)
+			end
+		end
+	end
+
+	for _, obj in ipairs(objects_to_move) do
+		local entity = obj:get_luaentity()
+		if not entity or not mesecon.is_mvps_unmov(entity.name) then
+			local np = mesecon.addPosRule(obj:getpos(), dir)
+
+			--move only if destination is not solid
+			local nn = minetest.get_node(np)
+			if not ((not minetest.registered_nodes[nn.name])
+			or minetest.registered_nodes[nn.name].walkable) then
+				obj:setpos(np)
+			end
+		end
+	end
+end
+
+mesecon.register_mvps_stopper("doors:door_steel_b_1")
+mesecon.register_mvps_stopper("doors:door_steel_t_1")
+mesecon.register_mvps_stopper("doors:door_steel_b_2")
+mesecon.register_mvps_stopper("doors:door_steel_t_2")
+mesecon.register_mvps_stopper("default:chest_locked")