summaryrefslogtreecommitdiff
path: root/mesecons_mvps/init.lua
blob: a7f2b45722d5fa8bd22fbd0998caa6242c60a3f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
--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)
	-- unknown nodes are always stoppers
	if not minetest.registered_nodes[node.name] then
		return true
	end

	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

-- tests if the node can be pushed into, e.g. air, water, grass
local function node_replaceable(name)
	if minetest.registered_nodes[name] then
		return minetest.registered_nodes[name].buildable_to or false
	end

	return false
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 not node_replaceable(nn.name) 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_set_owner(pos, placer)
	local meta = minetest.get_meta(pos)
	local owner = placer and placer.get_player_name and placer:get_player_name()
	if owner and owner ~= "" then
		meta:set_string("owner", owner)
	else
		meta:set_string("owner", "$unknown") -- to distinguish from older pistons
	end
end

function mesecon.mvps_claim(pos, player_name)
	if not player_name or player_name == "" then return end
	local meta = minetest.get_meta(pos)
	if meta:get_string("infotext") == "" then return end
	if meta:get_string("owner") == player_name then return end -- already owned
	if minetest.is_protected(pos, player_name) then
		minetest.chat_send_player(player_name, "Can't reclaim: protected")
		return
	end
	meta:set_string("owner", player_name)
	meta:set_string("infotext", "")
	return true
end

local function add_pos(positions, pos)
	local hash = minetest.hash_node_position(pos)
	positions[hash] = pos
end

local function are_protected(positions, player_name)
	local mode = mesecon.setting("mvps_protection_mode", "compat")
	if mode == "ignore" then
		return false
	end
	local name = player_name
	if player_name == "" or not player_name then -- legacy MVPS
		if mode == "normal" then
			name = "$unknown" -- sentinel, for checking for *any* protection
		elseif mode == "compat" then
			return false
		elseif mode == "restrict" then
			return true
		else
			error("Invalid protection mode")
		end
	end
	local is_protected = minetest.is_protected
	for _, pos in pairs(positions) do
		if is_protected(pos, name) then
			return true
		end
	end
	return false
end

function mesecon.mvps_push(pos, dir, maximum, player_name)
	return mesecon.mvps_push_or_pull(pos, dir, dir, maximum, false, player_name)
end

function mesecon.mvps_pull_all(pos, dir, maximum, player_name)
	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum, true, player_name)
end

function mesecon.mvps_pull_single(pos, dir, maximum, player_name)
	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum, false, player_name)
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
-- player_name: Player responsible for the action.
--  - empty string means legacy MVPS, actual check depends on configuration
--  - "$unknown" is a sentinel for forcing the check
function mesecon.mvps_push_or_pull(pos, stackdir, movedir, maximum, all_pull_sticky, player_name)
	local nodes = mesecon.mvps_get_stack(pos, movedir, maximum, all_pull_sticky)

	if not nodes then return end

	local protection_check_set = {}
	if vector.equals(stackdir, movedir) then -- pushing
		add_pos(protection_check_set, pos)
	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
		add_pos(protection_check_set, n.pos)
		add_pos(protection_check_set, vector.add(n.pos, movedir))
	end
	if are_protected(protection_check_set, player_name) then
		return false, "protected"
	end

	-- remove all nodes
	for _, n in ipairs(nodes) do
		n.meta = minetest.get_meta(n.pos):to_table()
		local node_timer = minetest.get_node_timer(n.pos)
		if node_timer:is_started() then
			n.node_timer = {node_timer:get_timeout(), node_timer:get_elapsed()}
		end
		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 = vector.add(n.pos, movedir)

		minetest.set_node(np, n.node)
		minetest.get_meta(np):from_table(n.meta)
		if n.node_timer then
			minetest.get_node_timer(np):set(unpack(n.node_timer))
		end
	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 = vector.add(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
		moved_nodes[i].node_timer = nodes[i].node_timer
	end

	on_mvps_move(moved_nodes)

	return true, nodes, oldstack
end

function mesecon.mvps_move_objects(pos, dir, nodestack, movefactor)
	local objects_to_move = {}
	local dir_k
	local dir_l
	for k, v in pairs(dir) do
		if v ~= 0 then
			dir_k = k
			dir_l = v
			break
		end
	end
	movefactor = movefactor or 1
	dir = vector.multiply(dir, movefactor)
	for id, obj in pairs(minetest.get_objects_inside_radius(pos, #nodestack + 1)) do
		local obj_pos = obj:get_pos()
		local cbox = obj:get_properties().collisionbox
		local min_pos = vector.add(obj_pos, vector.new(cbox[1], cbox[2], cbox[3]))
		local max_pos = vector.add(obj_pos, vector.new(cbox[4], cbox[5], cbox[6]))
		local ok = true
		local is_player = obj:is_player()
		for k, v in pairs(pos) do
			local edge1, edge2
			if k ~= dir_k then
				--Slightly more than 0.5 for normal entities so they get dragged with (for example, pushing carts)
				--but a bit less than 0.5 so players don't get unexpectedly pushed by a stack they aren't in front of.
				--In the special case of a player standing on top of a stack, use the larger value anyway to simulate friction moving the player.
				local range = is_player and 0.49 or 0.51
				edge1 = v - range
				edge2 = v + (k == "y" and 0.51 or range)
			else
				edge1 = v - 0.5 * dir_l
				edge2 = v + (#nodestack + 0.5 * movefactor) * dir_l
				-- Make sure, edge1 is bigger than edge2:
				if edge1 > edge2 then
					edge1, edge2 = edge2, edge1
				end
			end
			if min_pos[k] > edge2 or max_pos[k] < edge1 then
				ok = false
				break
			end
		end
		if ok then
			local ent = obj:get_luaentity()
			if obj:is_player() or (ent and not mesecon.is_mvps_unmov(ent.name)) then
				local np = vector.add(obj_pos, dir)
				-- Move only if destination is not solid or object is inside stack:
				local nn = minetest.get_node(np)
				local node_def = minetest.registered_nodes[nn.name]
				local obj_offset = dir_l * (obj_pos[dir_k] - pos[dir_k])
				if (node_def and not node_def.walkable) or
						(obj_offset >= 0 and
						obj_offset <= #nodestack - 0.5) then
					obj:move_to(np)
				end
			end
		end
	end
end

-- Never push into unloaded blocks. Don’t try to pull from them, either.
-- TODO: load blocks instead, as with wires.
mesecon.register_mvps_stopper("ignore")

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")
mesecon.register_on_mvps_move(mesecon.move_hot_nodes)
mesecon.register_on_mvps_move(function(moved_nodes)
	for i = 1, #moved_nodes do
		local moved_node = moved_nodes[i]
		mesecon.on_placenode(moved_node.pos, moved_node.node)
		minetest.after(0, function()
			minetest.check_for_falling(moved_node.oldpos)
			minetest.check_for_falling(moved_node.pos)
		end)
		local node_def = minetest.registered_nodes[moved_node.node.name]
		if node_def and node_def.mesecon and node_def.mesecon.on_mvps_move then
			node_def.mesecon.on_mvps_move(moved_node.pos, moved_node.node,
					moved_node.oldpos, moved_node.meta)
		end
	end
end)