Add "compass" mod.

README.md

@@ -87,6 +87,8 @@ The following mods are also included:
 * transport/
     * [carts][] ([WTFPL/CC0](mods/transport/carts/README.txt))
     * [helicopter][] ([GPL](mods/transport/helicopter/LICENSE) / [CC-BY-NC](mods/transport/helicopter/README.md))
+* ui/
+    * [compass][] (CC-BY-SA / WTFPL)
 * weather/
     * [lightning][] ([LGPL/CC-BY-SA](mods/weather/lightning/README.md))
     * [weather][] ([LGPL/WTFPL/CC-BY-SA](mods/weather/weather/README))
@@ -109,6 +111,7 @@ The following mods are also included:
 [character_creator]: https://forum.minetest.net/viewtopic.php?f=9&t=13138
 [chatlog]: https://forum.minetest.net/viewtopic.php?id=6220
 [cme]: https://forum.minetest.net/viewtopic.php?t=8638
+[compass]: https://forum.minetest.net/viewtopic.php?t=3785
 [craft_guide]: https://forum.minetest.net/viewtopic.php?t=2334
 [creeper]: https://forum.minetest.net/viewtopic.php?t=11891
 [farming_plus]: https://forum.minetest.net/viewtopic.php?t=2787

mods/ui/compass/depends.txt

@@ -0,0 +1 @@
+default

mods/ui/compass/init.lua

@@ -0,0 +1,119 @@
+-- default to 0/0/0
+local default_spawn = {x=0, y=0, z=0}
+-- default to static spawnpoint (overwrites 0/0/0)
+local default_spawn_settings = minetest.setting_get("static_spawnpoint")
+if (default_spawn_settings) then
+	pos1 = string.find(default_spawn_settings, ",", 0)
+	default_spawn.x = tonumber(string.sub(default_spawn_settings, 0, pos1 - 1))
+	pos2 = string.find(default_spawn_settings, ",", pos1 + 1)
+	default_spawn.y = tonumber(string.sub(default_spawn_settings, pos1 + 1, pos2 - 1))
+	default_spawn.z = tonumber(string.sub(default_spawn_settings, pos2 + 1))
+end
+
+local last_time_spawns_read = "default"
+local pilzadams_spawns = {}
+local sethome_spawns = {}
+function read_spawns()
+	-- read PilzAdams bed-mod positions
+	local pilzadams_file = io.open(minetest.get_worldpath().."/beds_player_spawns", "r")
+	if pilzadams_file then
+		pilzadams_spawns = minetest.deserialize(pilzadams_file:read("*all"))
+		pilzadams_file:close()
+	end
+	-- read sethome-mod positions
+	if minetest.get_modpath('sethome') then
+		local sethome_file = io.open(minetest.get_modpath('sethome')..'/homes', "r")
+		if sethome_file then
+			while true do
+				local x = sethome_file:read("*n")
+				if x == nil then
+					break
+				end
+				local y = sethome_file:read("*n")
+				local z = sethome_file:read("*n")
+				local name = sethome_file:read("*l")
+				sethome_spawns[name:sub(2)] = {x = x, y = y, z = z}
+			end
+			io.close(sethome_file)
+		end
+	end
+end
+
+minetest.register_globalstep(function(dtime)
+	if last_time_spawns_read ~= os.date("%M") then
+		last_time_spawns_read = os.date("%M")
+		read_spawns()
+	end
+	local players  = minetest.get_connected_players()
+	for i,player in ipairs(players) do
+		-- try to get position from PilzAdams bed-mod spawn
+		local spawn = pilzadams_spawns[player:get_player_name()]
+		-- fallback to sethome position
+		if spawn == nil then 
+			spawn = sethome_spawns[player:get_player_name()]
+		end
+		-- fallback to default
+		if spawn == nil then
+			spawn = default_spawn;
+		end
+		pos = player:getpos()
+		dir = player:get_look_yaw()
+		local angle_north = math.deg(math.atan2(spawn.x - pos.x, spawn.z - pos.z))
+		if angle_north < 0 then angle_north = angle_north + 360 end
+		angle_dir = 90 - math.deg(dir)
+		local angle_relative = (angle_north - angle_dir) % 360
+		local compass_image = math.floor((angle_relative/30) + 0.5)%12
+
+		local wielded_item = player:get_wielded_item():get_name()
+		if string.sub(wielded_item, 0, 8) == "compass:" then
+			player:set_wielded_item("compass:"..compass_image)
+		else
+			if player:get_inventory() then 
+				for i,stack in ipairs(player:get_inventory():get_list("main")) do
+					if i<9 and string.sub(stack:get_name(), 0, 8) == "compass:" then
+						player:get_inventory():remove_item("main", stack:get_name())
+						player:get_inventory():add_item("main", "compass:"..compass_image)
+					end
+				end
+			end
+		end
+	end
+end)
+
+local images = {
+	"compass_0.png",
+	"compass_1.png",
+	"compass_2.png",
+	"compass_3.png",
+	"compass_4.png",
+	"compass_5.png",
+	"compass_6.png",
+	"compass_7.png",
+	"compass_8.png",
+	"compass_9.png",
+	"compass_10.png",
+	"compass_11.png",
+}
+
+local i
+for i,img in ipairs(images) do
+	local inv = 1
+	if i == 1 then
+		inv = 0
+	end
+	minetest.register_tool("compass:"..(i-1), {
+		description = "Compass",
+		inventory_image = img,
+		wield_image = img,
+		groups = {not_in_creative_inventory=inv}
+	})
+end
+
+minetest.register_craft({
+	output = 'compass:1',
+	recipe = {
+		{'', 'default:steel_ingot', ''},
+		{'default:steel_ingot', 'default:mese_crystal_fragment', 'default:steel_ingot'},
+		{'', 'default:steel_ingot', ''}
+	}
+})