Add player detector

README

@@ -20,3 +20,8 @@ Note that the settings cannot be changed after setting - you must dig and re-pla
 
 How to use digimese:
 It conducts digilines signals (like digilines) in all directions (like mese). That's about it, really.
+
+
+How to use the digilines player detector:
+Set a channel and radius (radius must be a number >0 and <10 - anything invalid will be ignored and "6" useid instead).
+Every second while a player is within the radius, a table listing the players in range will be sent via digilines on the chosen channel.

init.lua

@@ -183,4 +183,61 @@ minetest.register_alias("digibutton:button_off","digistuff:button_off")
 minetest.register_alias("digibutton:button_on","digistuff:button_on")
 minetest.register_alias("digibutton:digimese","digistuff:digimese")
 
+minetest.register_node("digistuff:detector", {
+	tiles = {
+	"digistuff_digidetector.png"
+	},
+	digiline = 
+	{
+		receptor = {}
+	},
+	groups = {cracky=2},
+	description = "Digilines Player Detector",
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec","size[8,4;]field[1,1;6,2;channel;Channel;${channel}]field[1,2;6,2;radius;Radius;${radius}]button_exit[2.25,3;3,1;submit;Save]")
+	end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		local meta = minetest.get_meta(pos)
+		if fields.channel then meta:set_string("channel",fields.channel) end
+		if fields.msg then meta:set_string("msg",fields.msg) end
+		if fields.radius then meta:set_string("radius",fields.radius) end
+	end,
+	sounds = default.node_sound_stone_defaults()
+})
 
+minetest.register_abm({
+	nodenames = {"digistuff:detector"},
+	interval = 1.0,
+	chance = 1,
+	action = function(pos)
+			local meta = minetest.get_meta(pos)
+			local channel = meta:get_string("channel")
+			local radius = meta:get_string("radius")
+			local found_any = false
+			local players_found = {}
+			if not radius or not tonumber(radius) or tonumber(radius) < 1 or tonumber(radius) > 10 then radius = 6 end
+			local objs = minetest.get_objects_inside_radius(pos, radius)
+			if objs then
+				local _,obj
+				for _,obj in ipairs(objs) do
+					if obj:is_player() then
+						table.insert(players_found,obj:get_player_name())
+						found_any = true
+					end
+				end
+				if found_any then
+					digiline:receptor_send(pos, digiline.rules.default, channel, players_found)
+				end
+			end
+		end
+})
+
+minetest.register_craft({
+	output = "digistuff:detector",
+	recipe = {
+		{"mesecons_detector:object_detector_off"},
+		{"mesecons_luacontroller:luacontroller0000"},
+		{"digilines:wire_std_00000000"}
+	}
+})