Actions: Added some fundamental movement actions.

Places: Added functions for adding and getting places, and for finding places of specific types. Added beds, chairs and chest as places.
NPC: Added places map and action queue.

actions/actions.lua

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+-- Actions code for Advanced NPC by Zorman2000
+---------------------------------------------------------------------------------------
+-- Action functionality
+---------------------------------------------------------------------------------------
+-- The NPCs will be able to perform five fundamental actions that will allow
+-- for them to perform any other kind of interaction in the world. These
+-- fundamental actions are: place a node, dig a node, put items on an inventory,
+-- take items from an inventory, find a node closeby (radius 3) and
+-- walk a step on specific direction. These actions will be set on an action queue. 
+-- The queue will have the specific steps, in order, for the NPC to be able to do 
+-- something (example, go to a specific place and put a chest there). The 
+-- fundamental actions are added to the action queue to make a complete task for the NPC.
+
+npc.actions = {}
+
+function npc.actions.rotate(args)
+  local self = args.self
+  local dir = args.dir
+  local yaw = 0
+  self.rotate = 0
+  if dir == npc.direction.north then
+    yaw = 315
+  elseif dir == npc.direction.east then
+    yaw = 225
+  elseif dir == npc.direction.south then
+    yaw = 135
+  elseif dir == npc.direction.west then
+    yaw = 45
+  end
+  self.object:setyaw(yaw)
+end
+
+-- This function will make the NPC walk one step on a 
+-- specifc direction. One step means one node. It returns 
+-- true if it can move on that direction, and false if there is an obstacle
+function npc.actions.walk_step(args)
+  local self = args.self
+  local dir = args.dir
+  local vel = {}
+  if dir == npc.direction.north then
+    vel = {x=0, y=0, z=1}
+  elseif dir == npc.direction.east then
+    vel = {x=1, y=0, z=0}
+  elseif dir == npc.direction.south then
+    vel = {x=0, y=0, z=-1}
+  elseif dir == npc.direction.west then
+    vel = {x=-1, y=0, z=0}
+  end
+  set_animation(self, "walk")
+  npc.rotate({self=self, dir=dir})
+  self.object:setvelocity(vel)
+end
+
+-- This action makes the NPC stand and remain like that
+function npc.actions.stand(args)
+  local self = args.self
+  -- Stop NPC
+  self.object:setvelocity({x=0, y=0, z=0})
+  -- Set stand animation
+  set_animation(self, "stand")
+end
+
+-- This action makes the NPC sit on the node where it is
+function npc.actions.sit(args)
+  local self = args.self
+  -- Stop NPC
+  self.object:setvelocity({x=0, y=0, z=0})
+  -- Set sit animation
+  self.object:set_animation({
+        x = npc.ANIMATION_SIT_START,
+        y = npc.ANIMATION_SIT_END},
+        self.animation.speed_normal, 0)
+end
+
+-- This action makes the NPC lay on the node where it is
+function npc.actions.lay(args)
+  local self = args.self
+  -- Stop NPC
+  self.object:setvelocity({x=0, y=0, z=0})
+  -- Set sit animation
+  self.object:set_animation({
+        x = npc.ANIMATION_LAY_START,
+        y = npc.ANIMATION_LAY_END},
+        self.animation.speed_normal, 0)
+end

actions/places.lua

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+-- Places code for Advanced NPC by Zorman2000
+---------------------------------------------------------------------------------------
+-- Places functionality
+---------------------------------------------------------------------------------------
+-- In addition, the NPCs need to know where some places are, and know
+-- where there are nodes they can use. For example, they need to know where the
+-- chest they use is located, both to walk to it and to use it. They also need
+-- to know where the farm they work is located, or where the bed they sleep is.
+-- Other mods have to be supported for this to work correctly, as there are
+-- many sitting nodes, many beds, many tables, chests, etc. For now, by default,
+-- support for default and cottages is going to be provided.
+
+npc.places = {}
+
+npc.places.nodes = {
+  BEDS = {
+	 "beds:bed_bottom",
+	 "beds:fancy_bed_bottom"
+  }, 
+  CHAIRS = {
+	 "cottages:bench"
+  },
+  CHESTS = {
+	 "default:chest",
+	 "default:chest_locked"
+  }
+}
+
+npc.places.PLACE_TYPE = {
+	"OWN_BED",
+	"OWN_CHEST",
+	"HOUSE_CHAIR",
+	"HOUSE_TABLE",
+	"HOUSE_FURNACE",
+	"HOUSE_ENTRANCE"
+}
+
+
+function npc.places.add(self, place_name, place_type, pos)
+	self.places_map[place_name] = {type=place_type, pos=pos}
+end
+
+-- Adds a specific node to the NPC places, and modifies the
+-- node metadata to identify the NPC as the owner. This allows
+-- other NPCs to avoid to take this as their own.
+function npc.places.add_owned(self, place_name, place_type, pos)
+  -- Get node metadata
+  local meta = minetest.get_meta(pos)
+  -- Check if it is owned by an NPC?
+  if meta:get_string("npc_owner") == "" then
+    -- Set owned by NPC
+    meta:set_string("npc_owner", self.npc_id)
+    -- Add place to list
+    npc.places.add(self, place_name, place_type, pos)
+    return true
+  end
+  return false
+end
+
+function npc.places.get_by_type(self, place_type)
+	local result = {}
+	for place_name, place_entry in pairs(self.places_map) do
+		if place_entry.type == place_type then
+      table.insert(result, place_name)
+    end
+	end
+  return result
+end
+
+-- This function searches on a squared are of the given radius
+-- for nodes of the given type. The type should be npc.places.nodes
+function npc.places.find_new_nearby(self, type, radius)
+  -- Get current pos
+  local current_pos = self.object:getpos()
+   -- Determine area points
+  local start_pos = {x=current_pos.x - radius, y=current_pos.y - 1, z=current_pos.z - radius}
+  local end_pos = {x=current_pos.x + radius, y=current_pos.y + 1, z=current_pos.z + radius}
+  -- Get nodes
+  local nodes = minetest.find_nodes_in_area(start_pos, end_pos, type)
+  
+  return nodes
+end