Revert "Don't leak textures all over the place"
[oweals/minetest.git] / builtin / item.lua
1 -- Minetest: builtin/item.lua
2
3 --
4 -- Item definition helpers
5 --
6
7 function minetest.inventorycube(img1, img2, img3)
8         img2 = img2 or img1
9         img3 = img3 or img1
10         return "[inventorycube"
11                         .. "{" .. img1:gsub("%^", "&")
12                         .. "{" .. img2:gsub("%^", "&")
13                         .. "{" .. img3:gsub("%^", "&")
14 end
15
16 function minetest.get_pointed_thing_position(pointed_thing, above)
17         if pointed_thing.type == "node" then
18                 if above then
19                         -- The position where a node would be placed
20                         return pointed_thing.above
21                 else
22                         -- The position where a node would be dug
23                         return pointed_thing.under
24                 end
25         elseif pointed_thing.type == "object" then
26                 obj = pointed_thing.ref
27                 if obj ~= nil then
28                         return obj:getpos()
29                 else
30                         return nil
31                 end
32         else
33                 return nil
34         end
35 end
36
37 function minetest.dir_to_facedir(dir)
38         if math.abs(dir.x) > math.abs(dir.z) then
39                 if dir.x < 0 then
40                         return 3
41                 else
42                         return 1
43                 end
44         else
45                 if dir.z < 0 then
46                         return 2
47                 else
48                         return 0
49                 end
50         end
51 end
52
53 function minetest.dir_to_wallmounted(dir)
54         if math.abs(dir.y) > math.max(math.abs(dir.x), math.abs(dir.z)) then
55                 if dir.y < 0 then
56                         return 1
57                 else
58                         return 0
59                 end
60         elseif math.abs(dir.x) > math.abs(dir.z) then
61                 if dir.x < 0 then
62                         return 3
63                 else
64                         return 2
65                 end
66         else
67                 if dir.z < 0 then
68                         return 5
69                 else
70                         return 4
71                 end
72         end
73 end
74
75 function minetest.get_node_drops(nodename, toolname)
76         local drop = ItemStack({name=nodename}):get_definition().drop
77         if drop == nil then
78                 -- default drop
79                 return {ItemStack({name=nodename})}
80         elseif type(drop) == "string" then
81                 -- itemstring drop
82                 return {ItemStack(drop)}
83         elseif drop.items == nil then
84                 -- drop = {} to disable default drop
85                 return {}
86         end
87
88         -- Extended drop table
89         local got_items = {}
90         local got_count = 0
91         local _, item, tool
92         for _, item in ipairs(drop.items) do
93                 local good_rarity = true
94                 local good_tool = true
95                 if item.rarity ~= nil then
96                         good_rarity = item.rarity < 1 or math.random(item.rarity) == 1
97                 end
98                 if item.tools ~= nil then
99                         good_tool = false
100                         for _, tool in ipairs(item.tools) do
101                                 if tool:sub(1, 1) == '~' then
102                                         good_tool = toolname:find(tool:sub(2)) ~= nil
103                                 else
104                                         good_tool = toolname == tool
105                                 end
106                                 if good_tool then
107                                         break
108                                 end
109                         end
110                 end
111                 if good_rarity and good_tool then
112                         got_count = got_count + 1
113                         for _, add_item in ipairs(item.items) do
114                                 got_items[#got_items+1] = add_item
115                         end
116                         if drop.max_items ~= nil and got_count == drop.max_items then
117                                 break
118                         end
119                 end
120         end
121         return got_items
122 end
123
124 function minetest.item_place_node(itemstack, placer, pointed_thing)
125         local item = itemstack:peek_item()
126         local def = itemstack:get_definition()
127         if def.type ~= "node" or pointed_thing.type ~= "node" then
128                 return itemstack
129         end
130
131         local under = pointed_thing.under
132         local oldnode_under = minetest.env:get_node(under)
133         local olddef_under = ItemStack({name=oldnode_under.name}):get_definition()
134         olddef_under = olddef_under or minetest.nodedef_default
135         local above = pointed_thing.above
136         local oldnode_above = minetest.env:get_node(above)
137         local olddef_above = ItemStack({name=oldnode_above.name}):get_definition()
138         olddef_above = olddef_above or minetest.nodedef_default
139
140         if not olddef_above.buildable_to and not olddef_under.buildable_to then
141                 minetest.log("info", placer:get_player_name() .. " tried to place"
142                         .. " node in invalid position " .. minetest.pos_to_string(above)
143                         .. ", replacing " .. oldnode_above.name)
144                 return
145         end
146
147         -- Place above pointed node
148         local place_to = {x = above.x, y = above.y, z = above.z}
149
150         -- If node under is buildable_to, place into it instead (eg. snow)
151         if olddef_under.buildable_to then
152                 minetest.log("info", "node under is buildable to")
153                 place_to = {x = under.x, y = under.y, z = under.z}
154         end
155
156         minetest.log("action", placer:get_player_name() .. " places node "
157                 .. def.name .. " at " .. minetest.pos_to_string(place_to))
158         
159         local oldnode = minetest.env:get_node(place_to)
160         local newnode = {name = def.name, param1 = 0, param2 = 0}
161
162         -- Calculate direction for wall mounted stuff like torches and signs
163         if def.paramtype2 == 'wallmounted' then
164                 local dir = {
165                         x = under.x - above.x,
166                         y = under.y - above.y,
167                         z = under.z - above.z
168                 }
169                 newnode.param2 = minetest.dir_to_wallmounted(dir)
170         -- Calculate the direction for furnaces and chests and stuff
171         elseif def.paramtype2 == 'facedir' then
172                 local placer_pos = placer:getpos()
173                 if placer_pos then
174                         local dir = {
175                                 x = above.x - placer_pos.x,
176                                 y = above.y - placer_pos.y,
177                                 z = above.z - placer_pos.z
178                         }
179                         newnode.param2 = minetest.dir_to_facedir(dir)
180                         minetest.log("action", "facedir: " .. newnode.param2)
181                 end
182         end
183
184         -- Add node and update
185         minetest.env:add_node(place_to, newnode)
186
187         -- Run callback
188         if def.after_place_node then
189                 -- Copy place_to because callback can modify it
190                 local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
191                 def.after_place_node(place_to_copy, placer)
192         end
193
194         -- Run script hook
195         local _, callback
196         for _, callback in ipairs(minetest.registered_on_placenodes) do
197                 -- Copy pos and node because callback can modify them
198                 local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
199                 local newnode_copy = {name=newnode.name, param1=newnode.param1, param2=newnode.param2}
200                 local oldnode_copy = {name=oldnode.name, param1=oldnode.param1, param2=oldnode.param2}
201                 callback(place_to_copy, newnode_copy, placer, oldnode_copy)
202         end
203
204         itemstack:take_item()
205         return itemstack
206 end
207
208 function minetest.item_place_object(itemstack, placer, pointed_thing)
209         local pos = minetest.get_pointed_thing_position(pointed_thing, true)
210         if pos ~= nil then
211                 local item = itemstack:take_item()
212                 minetest.env:add_item(pos, item)
213         end
214         return itemstack
215 end
216
217 function minetest.item_place(itemstack, placer, pointed_thing)
218         if itemstack:get_definition().type == "node" then
219                 return minetest.item_place_node(itemstack, placer, pointed_thing)
220         else
221                 return minetest.item_place_object(itemstack, placer, pointed_thing)
222         end
223 end
224
225 function minetest.item_drop(itemstack, dropper, pos)
226         if dropper.get_player_name then
227                 local v = dropper:get_look_dir()
228                 local p = {x=pos.x+v.x, y=pos.y+1.5+v.y, z=pos.z+v.z}
229                 local obj = minetest.env:add_item(p, itemstack)
230                 if obj then
231                         v.x = v.x*2
232                         v.y = v.y*2 + 1
233                         v.z = v.z*2
234                         obj:setvelocity(v)
235                 end
236         else
237                 minetest.env:add_item(pos, itemstack)
238         end
239         return ""
240 end
241
242 function minetest.item_eat(hp_change, replace_with_item)
243         return function(itemstack, user, pointed_thing)  -- closure
244                 if itemstack:take_item() ~= nil then
245                         user:set_hp(user:get_hp() + hp_change)
246                         itemstack:add_item(replace_with_item) -- note: replace_with_item is optional
247                 end
248                 return itemstack
249         end
250 end
251
252 function minetest.node_punch(pos, node, puncher)
253         -- Run script hook
254         local _, callback
255         for _, callback in ipairs(minetest.registered_on_punchnodes) do
256                 -- Copy pos and node because callback can modify them
257                 local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
258                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
259                 callback(pos_copy, node_copy, puncher)
260         end
261 end
262
263 function minetest.handle_node_drops(pos, drops, digger)
264         -- Add dropped items to object's inventory
265         if digger:get_inventory() then
266                 local _, dropped_item
267                 for _, dropped_item in ipairs(drops) do
268                         digger:get_inventory():add_item("main", dropped_item)
269                 end
270         end
271 end
272
273 function minetest.node_dig(pos, node, digger)
274         minetest.debug("node_dig")
275
276         local def = ItemStack({name=node.name}):get_definition()
277         -- Check if def ~= 0 because we always want to be able to remove unknown nodes
278         if #def ~= 0 and not def.diggable or (def.can_dig and not def.can_dig(pos,digger)) then
279                 minetest.debug("not diggable")
280                 minetest.log("info", digger:get_player_name() .. " tried to dig "
281                         .. node.name .. " which is not diggable "
282                         .. minetest.pos_to_string(pos))
283                 return
284         end
285
286         minetest.log('action', digger:get_player_name() .. " digs "
287                 .. node.name .. " at " .. minetest.pos_to_string(pos))
288
289         local wielded = digger:get_wielded_item()
290         local drops = minetest.get_node_drops(node.name, wielded:get_name())
291
292         -- Wear out tool
293         local tp = wielded:get_tool_capabilities()
294         local dp = minetest.get_dig_params(def.groups, tp)
295         wielded:add_wear(dp.wear)
296         digger:set_wielded_item(wielded)
297         
298         -- Handle drops
299         minetest.handle_node_drops(pos, drops, digger)
300
301         local oldmetadata = nil
302         if def.after_dig_node then
303                 oldmetadata = minetest.env:get_meta(pos):to_table()
304         end
305
306         -- Remove node and update
307         minetest.env:remove_node(pos)
308         
309         -- Run callback
310         if def.after_dig_node then
311                 -- Copy pos and node because callback can modify them
312                 local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
313                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
314                 def.after_dig_node(pos_copy, node_copy, oldmetadata, digger)
315         end
316
317         -- Run script hook
318         local _, callback
319         for _, callback in ipairs(minetest.registered_on_dignodes) do
320                 -- Copy pos and node because callback can modify them
321                 local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
322                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
323                 callback(pos_copy, node_copy, digger)
324         end
325 end
326
327 -- This is used to allow mods to redefine minetest.item_place and so on
328 -- NOTE: This is not the preferred way. Preferred way is to provide enough
329 --       callbacks to not require redefining global functions. -celeron55
330 local function redef_wrapper(table, name)
331         return function(...)
332                 return table[name](...)
333         end
334 end
335
336 --
337 -- Item definition defaults
338 --
339
340 minetest.nodedef_default = {
341         -- Item properties
342         type="node",
343         -- name intentionally not defined here
344         description = "",
345         groups = {},
346         inventory_image = "",
347         wield_image = "",
348         wield_scale = {x=1,y=1,z=1},
349         stack_max = 99,
350         usable = false,
351         liquids_pointable = false,
352         tool_capabilities = nil,
353         node_placement_prediction = nil,
354
355         -- Interaction callbacks
356         on_place = redef_wrapper(minetest, 'item_place'), -- minetest.item_place
357         on_drop = redef_wrapper(minetest, 'item_drop'), -- minetest.item_drop
358         on_use = nil,
359         can_dig = nil,
360
361         on_punch = redef_wrapper(minetest, 'node_punch'), -- minetest.node_punch
362         on_dig = redef_wrapper(minetest, 'node_dig'), -- minetest.node_dig
363
364         on_receive_fields = nil,
365         
366         on_metadata_inventory_move = minetest.node_metadata_inventory_move_allow_all,
367         on_metadata_inventory_offer = minetest.node_metadata_inventory_offer_allow_all,
368         on_metadata_inventory_take = minetest.node_metadata_inventory_take_allow_all,
369
370         -- Node properties
371         drawtype = "normal",
372         visual_scale = 1.0,
373         -- Don't define these because otherwise the old tile_images and
374         -- special_materials wouldn't be read
375         --tiles ={""},
376         --special_tiles = {
377         --      {name="", backface_culling=true},
378         --      {name="", backface_culling=true},
379         --},
380         alpha = 255,
381         post_effect_color = {a=0, r=0, g=0, b=0},
382         paramtype = "none",
383         paramtype2 = "none",
384         is_ground_content = false,
385         sunlight_propagates = false,
386         walkable = true,
387         pointable = true,
388         diggable = true,
389         climbable = false,
390         buildable_to = false,
391         liquidtype = "none",
392         liquid_alternative_flowing = "",
393         liquid_alternative_source = "",
394         liquid_viscosity = 0,
395         light_source = 0,
396         damage_per_second = 0,
397         selection_box = {type="regular"},
398         legacy_facedir_simple = false,
399         legacy_wallmounted = false,
400 }
401
402 minetest.craftitemdef_default = {
403         type="craft",
404         -- name intentionally not defined here
405         description = "",
406         groups = {},
407         inventory_image = "",
408         wield_image = "",
409         wield_scale = {x=1,y=1,z=1},
410         stack_max = 99,
411         liquids_pointable = false,
412         tool_capabilities = nil,
413
414         -- Interaction callbacks
415         on_place = redef_wrapper(minetest, 'item_place'), -- minetest.item_place
416         on_drop = redef_wrapper(minetest, 'item_drop'), -- minetest.item_drop
417         on_use = nil,
418 }
419
420 minetest.tooldef_default = {
421         type="tool",
422         -- name intentionally not defined here
423         description = "",
424         groups = {},
425         inventory_image = "",
426         wield_image = "",
427         wield_scale = {x=1,y=1,z=1},
428         stack_max = 1,
429         liquids_pointable = false,
430         tool_capabilities = nil,
431
432         -- Interaction callbacks
433         on_place = redef_wrapper(minetest, 'item_place'), -- minetest.item_place
434         on_drop = redef_wrapper(minetest, 'item_drop'), -- minetest.item_drop
435         on_use = nil,
436 }
437
438 minetest.noneitemdef_default = {  -- This is used for the hand and unknown items
439         type="none",
440         -- name intentionally not defined here
441         description = "",
442         groups = {},
443         inventory_image = "",
444         wield_image = "",
445         wield_scale = {x=1,y=1,z=1},
446         stack_max = 99,
447         liquids_pointable = false,
448         tool_capabilities = nil,
449
450         -- Interaction callbacks
451         on_place = nil,
452         on_drop = nil,
453         on_use = nil,
454 }
455