write something there

mods/telemosaic/.luacheckrc

@@ -0,0 +1,18 @@
+unused_args = false
+
+globals = {
+	"telemosaic"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+
+	-- Minetest
+	"minetest",
+	"vector", "ItemStack",
+
+	-- Deps
+	"default",
+	"digilines"
+}

mods/telemosaic/LICENSE

@@ -0,0 +1,505 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
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+

mods/telemosaic/README.md

@@ -0,0 +1,59 @@
+# Telemosaic [telemosaic]
+
+[![luacheck](https://github.com/mt-mods/telemosaic/workflows/luacheck/badge.svg)](https://github.com/mt-mods/telemosaic/actions)
+
+A Minetest mod for user-generated teleportation pads.
+
+![screenshot](screenshot.png?raw=true "screenshot")
+
+## Description
+
+This is a mod for Minetest. It provides teleportation pads, called "beacons". Unlike other teleportation mods, no menus or GUIs are used; you set the destination with a simple "key" item. There is no tooltip for the destination either, so signs are recommended.
+
+Another difference is the limited default range of the beacons. To increase the range, you need to place "extenders" around the beacon. The extenders come in different colors, allowing the extenders to form a pretty pattern; hence the name "telemosaic".
+
+## Notes
+
+This is a maintained fork of https://github.com/bendeutsch/minetest-telemosaic with various improvements and changes, optimized for multiplayer environments.
+
+* Beacons no longer teleport players automatically, they must be right-clicked by a player.
+* More chat messages are sent to inform and help players with non-functional telemosaics.
+* Telemosaic keys can be preserved by holding shift when right-clicking a beacon.
+* Beacons can be enabled and disabled by punching them with a telemosaic key.
+* If the `digilines` mod is installed, beacons can be controlled by digilines.
+* and other small changes...
+
+## Usage
+
+Right-clicking a beacon with a default mese crystal fragment creates a telemosaic key with the position of the beacon.
+
+Right-clicking a second beacon with the key sets the destination of the second beacon to the position of the first beacon. To set up a return path, right-click the second beacon with the fragment, and then first beacon with the resulting key again.
+
+The beacons do not need to be strictly paired this way: rings or star-shaped networks are also possible. Each beacon has only a single destination, but can itself be the destination of several others.
+
+Once linked, you teleport between beacons by right-clicking them. Before teleporting, beacons will check that their destination is sane: the destination still needs to be a beacon, and the two nodes above it should be clear for walking/standing in.
+
+Beacons have a default range of 20 nodes. If the destination is too far away, the beacon will turn red and will not function. To extend the range for a beacon, place "extenders" next to it, within a 7x7 horizontal square centered on the beacon, and at the same level or one node below the beacon.
+
+Extenders come in three tiers, with each being more powerful than the tier below. By default, tier 1, tier 2, and tier 3 extenders increase the range of nearby beacons by 5, 20, and 80 nodes, respectively.
+
+Extenders can be colored with any of the dyes found in the `dye` mod. Colored extenders work just like regular extenders, both for teleporting and for recipes.
+
+## Digilines
+
+When the `digilines` mod is installed, telemosaic beacons can be controlled by sending digiline messages. By default, all beacons use the channel "telemosaic", but you can change the channel name via digilines.
+
+For full documentaion, see [digilines.md](digilines.md).
+
+## Dependencies
+
+* `default`
+* `doors`
+* `dye` (optional)
+* `digilines` (optional)
+
+## License
+
+* Code: LGPL 2.1 (see included LICENSE file)
+* Textures: CC-BY-SA (see http://creativecommons.org/licenses/by-sa/4.0/)
+* textures/telemosaic_beacon_protected_overlay.png MIT (https://notabug.org/TenPlus1/protector)

mods/telemosaic/abm.lua

@@ -0,0 +1,22 @@
+
+minetest.register_abm({
+	label = "Telemosaic beacon effect",
+	nodenames = {"group:telemosaic_active"},
+	interval = 2.0,
+	chance = 2,
+	catch_up = false,
+	action = function(pos)
+		minetest.add_particlespawner({
+			amount = 4,
+			time = 2,
+			minpos = vector.add(pos, {x=-0.2, y=0, z=-0.2}),
+			maxpos = vector.add(pos, {x=0.2, y=0, z=0.2}),
+			minvel = {x=0, y=1, z=0},
+			maxvel = {x=0, y=2, z=0},
+			maxexptime = 2,
+			maxsize = 1.7,
+			texture = "telemosaic_particle_arrival.png",
+			glow = 9
+		})
+	end
+})

mods/telemosaic/beacon.lua

@@ -0,0 +1,92 @@
+local S = minetest.get_translator("telemosaic")
+
+for _,protected in pairs({true, false}) do
+
+	local node_name_suffix = protected and "_protected" or ""
+	local texture_overlay = protected and "^telemosaic_beacon_protected_overlay.png" or ""
+	local description = protected and "Protected Telemosaic Beacon"
+		or "Telemosaic Beacon"
+	local description_prefix = protected and "Protected " or ""
+
+	minetest.register_node("telemosaic:beacon_off"..node_name_suffix, {
+		description = S(description),
+		tiles = {
+			"telemosaic_beacon_off.png"..texture_overlay,
+			"telemosaic_beacon_side.png",
+		},
+		paramtype = "light",
+		groups = {cracky = 2, telemosaic = 1, telemosaic_off = 1},
+		is_ground_content = false,
+		on_rightclick = telemosaic.rightclick,
+		digilines = telemosaic.digilines,
+		sounds = default.node_sound_metal_defaults(),
+	})
+
+	minetest.register_node("telemosaic:beacon"..node_name_suffix, {
+		description = S(description_prefix ..
+			"Telemosaic Beacon Active (you hacker you!)"),
+		tiles = {
+			"telemosaic_beacon_top.png"..texture_overlay,
+			"telemosaic_beacon_side.png",
+		},
+		paramtype = "light",
+		groups = {cracky = 2, not_in_creative_inventory = 1, telemosaic = 1, telemosaic_active = 1},
+		is_ground_content = false,
+		drop = "telemosaic:beacon_off"..node_name_suffix,
+		on_rightclick = telemosaic.rightclick,
+		digilines = telemosaic.digilines,
+		sounds = default.node_sound_metal_defaults(),
+	})
+
+	minetest.register_node("telemosaic:beacon_err"..node_name_suffix, {
+		description = S(description_prefix ..
+			"Telemosaic Beacon Error (you hacker you!)"),
+		tiles = {
+			"telemosaic_beacon_err.png"..texture_overlay,
+			"telemosaic_beacon_side.png",
+		},
+		paramtype = "light",
+		groups = {cracky = 2, not_in_creative_inventory = 1, telemosaic = 1, telemosaic_error = 1},
+		is_ground_content = false,
+		drop = "telemosaic:beacon_off"..node_name_suffix,
+		on_rightclick = telemosaic.rightclick,
+		digilines = telemosaic.digilines,
+		sounds = default.node_sound_metal_defaults(),
+	})
+
+	minetest.register_node("telemosaic:beacon_disabled"..node_name_suffix, {
+		description = S(description_prefix ..
+			"Telemosaic Beacon Disabled (you hacker you!)"),
+		tiles = {
+			"telemosaic_beacon_disabled.png"..texture_overlay,
+			"telemosaic_beacon_side.png",
+		},
+		paramtype = "light",
+		groups = {cracky = 2, not_in_creative_inventory = 1, telemosaic = 1, telemosaic_disabled = 1},
+		is_ground_content = false,
+		drop = "telemosaic:beacon_off"..node_name_suffix,
+		on_rightclick = telemosaic.rightclick,
+		digilines = telemosaic.digilines,
+		sounds = default.node_sound_metal_defaults(),
+	})
+end
+
+minetest.register_craft({
+	output = "telemosaic:beacon_off",
+	recipe = {
+		{"default:diamond", "doors:door_wood", "default:diamond"},
+		{"default:obsidian","default:obsidian","default:obsidian"}
+	}
+})
+
+minetest.register_craft({
+	output = "telemosaic:beacon_off_protected",
+	type = "shapeless",
+	recipe = {"telemosaic:beacon_off", "default:steel_ingot"}
+})
+
+minetest.register_craft({
+	output = "telemosaic:beacon_off",
+	type = "shapeless",
+	recipe = {"telemosaic:beacon_off_protected"}
+})

mods/telemosaic/digilines.lua

@@ -0,0 +1,81 @@
+
+local function digiline_receive(pos, _, channel, msg)
+	local meta = minetest.get_meta(pos)
+
+	local set_channel = meta:get("channel") or telemosaic.default_channel
+	if channel ~= set_channel then
+		return
+	end
+
+	if type(msg) == "string" then
+		-- Convert string command to table
+		if msg == "get" or msg == "GET" then
+			msg = {command = "get"}
+
+		elseif msg == "enable" or msg == "disable" then
+			msg = {command = msg}
+
+		elseif msg:match("^setchannel .+") then
+			local c = string.split(msg, " ", true, 1)
+			msg = {command = c[1], channel = c[2]}
+
+		elseif msg:match("^setdest .+") then
+			local c = string.split(msg, " ", true, 1)
+			local p = string.split(c[2], ",")
+			msg = {command = c[1], x = p[1], y = p[2], z = p[3]}
+		end
+	end
+
+	if type(msg) ~= "table" or not msg.command then
+		return
+	end
+
+	if msg.command == "get" then
+		local dest = telemosaic.get_destination(pos)
+		digilines.receptor_send(pos, digilines.rules.default, set_channel, {
+			state = telemosaic.get_state(pos),
+			origin = pos,
+			target = dest,
+			pos = pos,
+			destination = dest,
+		})
+
+	elseif msg.command == "setchannel" then
+		if type(msg.channel) == "string" then
+			meta:set_string("channel", msg.channel)
+		end
+
+	elseif msg.command == "enable" then
+		if telemosaic.get_state(pos) == "disabled" then
+			telemosaic.set_state(pos, "active")
+		end
+
+	elseif msg.command == "disable" then
+		if telemosaic.get_state(pos) == "active" then
+			telemosaic.set_state(pos, "disabled")
+		end
+
+	elseif msg.command == "setdest" then
+		local dest = msg.pos or {
+			x = msg.x,
+			y = msg.y,
+			z = msg.z
+		}
+		if type(dest) ~= "table" then
+			return
+		end
+		dest.x = tonumber(dest.x)
+		dest.y = tonumber(dest.y)
+		dest.z = tonumber(dest.z)
+		if dest.x and dest.y and dest.z then
+			telemosaic.set_destination(pos, dest)
+		end
+	end
+end
+
+telemosaic.digilines = {
+	receptor = {},
+	effector = {
+		action = digiline_receive
+	}
+}

mods/telemosaic/digilines.md

@@ -0,0 +1,75 @@
+# Telemosaic digilines documentation
+
+An overview of all commands and functionality, with example Lua code.
+
+For convenience, and for using digiline buttons, all commands can also be sent as text.
+
+### Change the digiline channel
+
+**Lua:**
+
+```lua
+digiline_send("telemosaic", {command = "setchannel", channel = "whatever"})
+```
+
+**Text:** `setchannel whatever`
+
+### Disable a beacon
+
+**Lua:**
+
+```lua
+digiline_send("telemosaic", {command = "disable"})
+```
+
+**Text:** `disable`
+
+### Enable a beacon
+
+**Lua:**
+
+```lua
+digiline_send("telemosaic", {command = "enable"})
+```
+
+**Text:** `enable`
+
+### Set a new destination
+
+**Lua:**
+
+```lua
+digiline_send("telemosaic", {command = "setdest", x = 0, y = 0, z = 0})
+```
+
+or
+
+```lua
+digiline_send("telemosaic", {command = "setdest", pos = {x = 0, y = 0, z = 0}})
+```
+
+**Text:** `setdest 0,0,0`
+
+Note that the destination will only be set if it's valid (beacon at destination).
+
+### Get data from a beacon
+
+**Lua**
+
+```lua
+digiline_send("telemosaic", {command = "get"})
+```
+
+**Text:** `get` or `GET`
+
+Returns a table containing the following:
+
+```lua
+{
+    state = "active",  -- or "disabled", "off", or "error"
+    pos = {x = 1, y = 2, z = 3},
+    destination = {x = 4, y = 5, z = 6},
+    origin = {x = 1, y = 2, z = 3},  -- same as 'pos'
+    target = {x = 4, y = 5, z = 6},  -- same as 'destination'
+}
+```

mods/telemosaic/extender.lua

@@ -0,0 +1,98 @@
+local S = minetest.get_translator("telemosaic")
+
+local has_dye = minetest.get_modpath("dye")
+
+local function pretty_str(s)
+	s = string.upper(string.sub(s, 1, 1))..string.sub(s, 2)
+	local i = string.find(s, "_")
+	if i then
+		local c = string.upper(string.sub(s, i + 1, i + 1))
+		s = string.gsub(s, "_.", " "..c)
+	end
+	return s
+end
+
+local tiers = {"one", "two", "three"}
+
+for i, range in pairs(telemosaic.extender_ranges) do
+	local tier = tiers[i]
+
+	local common_desc, basic_desc
+	if has_dye then
+		common_desc = "Telemosaic Extender, Tier @1 (@2)"
+		basic_desc = S(common_desc, i, S("Grey"))
+	else
+		common_desc = "Telemosaic Extender, Tier @1"
+		basic_desc = S(common_desc, i)
+	end
+
+	minetest.register_node("telemosaic:extender_"..tier, {
+		description = basic_desc,
+		tiles = {
+			"telemosaic_extender_"..tier..".png"
+		},
+		paramtype = "light",
+		groups = {cracky = 2, telemosaic_extender = range, ["telemosaic_extender_"..tier] = 1},
+		is_ground_content = false,
+		after_place_node = telemosaic.extender_place,
+		after_dig_node = telemosaic.extender_dig,
+		sounds = default.node_sound_metal_defaults(),
+	})
+
+	if has_dye then
+		minetest.register_craft({
+			type = "shapeless",
+			output = "telemosaic:extender_"..tier,
+			recipe = {"group:telemosaic_extender_"..tier, "dye:grey"},
+		})
+
+		for name, color in pairs(telemosaic.extender_colors) do
+			minetest.register_node("telemosaic:extender_"..tier.."_"..name, {
+				description = S(common_desc, i, S(pretty_str(name))),
+				tiles = {
+					"telemosaic_extender_"..tier..".png^[colorize:"..color
+				},
+				paramtype = "light",
+				groups = {
+					cracky = 2, not_in_creative_inventory = 1,
+					telemosaic_extender = range, ["telemosaic_extender_"..tier] = 1
+				},
+				is_ground_content = false,
+				after_place_node = telemosaic.extender_place,
+				after_dig_node = telemosaic.extender_dig,
+				sounds = default.node_sound_metal_defaults(),
+			})
+
+			minetest.register_craft({
+				type = "shapeless",
+				output = "telemosaic:extender_"..tier.."_"..name,
+				recipe = {"group:telemosaic_extender_"..tier, "dye:"..name},
+			})
+		end
+	end
+end
+
+minetest.register_craft({
+	output = "telemosaic:extender_one",
+	recipe = {
+		{"default:obsidian", "doors:door_wood", "default:obsidian"}
+	}
+})
+
+minetest.register_craft({
+	output = "telemosaic:extender_two",
+	recipe = {
+		{"", "group:telemosaic_extender_one", ""},
+		{"group:telemosaic_extender_one", "default:obsidian", "group:telemosaic_extender_one"},
+		{"", "group:telemosaic_extender_one", ""}
+	}
+})
+
+minetest.register_craft({
+	output = "telemosaic:extender_three",
+	recipe = {
+		{"", "group:telemosaic_extender_two", ""},
+		{"group:telemosaic_extender_two", "default:obsidian", "group:telemosaic_extender_two"},
+		{"", "group:telemosaic_extender_two", ""}
+	}
+})

mods/telemosaic/functions.lua

@@ -0,0 +1,385 @@
+local S = minetest.get_translator("telemosaic")
+
+-- Keeps a track of players to prevent teleport spamming
+local recent_teleports = {}
+
+
+-- Not the same as `minetest.hash_node_position` and `minetest.get_position_from_hash`
+local function hash_pos(pos)
+	return math.floor(pos.x + 0.5)..':'..
+		math.floor(pos.y + 0.5)..':'..
+		math.floor(pos.z + 0.5)
+end
+
+local function unhash_pos(hash)
+	local list = string.split(hash, ':')
+	local p = {
+		x = tonumber(list[1]),
+		y = tonumber(list[2]),
+		z = tonumber(list[3])
+	}
+	if p.x and p.y and p.z then
+		return p
+	end
+end
+
+
+-- Wrap this function to incorporate travel checks from another mod
+function telemosaic.travel_allowed(player, src, dest)
+	return true
+end
+
+
+function telemosaic.is_protected_beacon(pos, player_name)
+	local node_name = minetest.get_node(pos).name
+	if node_name:match("^telemosaic:beacon_.*protected$") then
+		if minetest.is_protected(pos, player_name) then
+			return true
+		end
+	end
+	return false
+end
+
+function telemosaic.get_state(pos)
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_nodes[node.name]
+
+	if not def or not def.groups then return "invalid" end
+
+	if def.groups.telemosaic_off then return "off" end
+	if def.groups.telemosaic_active then return "active" end
+	if def.groups.telemosaic_disabled then return "disabled" end
+	if def.groups.telemosaic_error then return "error" end
+
+	return "invalid"
+end
+
+function telemosaic.set_state(pos, state)
+	local node = minetest.get_node(pos)
+
+	if not string.match(node.name, "^telemosaic:beacon") then
+		return  -- Not a telemosaic!
+	end
+
+	local new_name = "telemosaic:beacon"
+
+	if state == "off" then
+		new_name = new_name.."_off"
+	elseif state == "error" then
+		new_name = new_name.."_err"
+	elseif state == "disabled" then
+		new_name = new_name.."_disabled"
+	elseif state ~= "active" then
+		return  -- Can't set a state that doesn't exist
+	end
+
+	if string.match(node.name, "protected$") then
+		new_name = new_name.."_protected"
+	end
+
+	-- Swap node instead of set node to keep the metadata
+	minetest.swap_node(pos, {name = new_name})
+end
+
+function telemosaic.is_valid_destination(pos)
+	local pos_above = {x = pos.x, y = pos.y + 1, z = pos.z}
+	local pos_top = {x = pos.x, y = pos.y + 2, z = pos.z}
+
+	local node = minetest.get_node_or_nil(pos)
+	local node_above = minetest.get_node_or_nil(pos_above)
+	local node_top = minetest.get_node_or_nil(pos_top)
+
+	if not node or not node_above or not node_top then
+		-- Need to load the map
+		minetest.get_voxel_manip():read_from_map(pos, pos_top)
+		node = node or minetest.get_node(pos)
+		node_above = node_above or minetest.get_node(pos_above)
+		node_top = node_top or minetest.get_node(pos_top)
+	end
+
+	local valid = true
+
+	-- Check if there is a telemosaic at the destination
+	if not string.match(node.name, "^telemosaic:beacon") then
+		valid = false
+	end
+
+	-- Check if the nodes above are not walkable (yes, confusing naming)
+	if node_above.name ~= "air" and node_above.name ~= "vacuum:vacuum" then
+		local def = minetest.registered_nodes[node_above.name]
+		if def and def.walkable then
+			return valid, false
+		end
+	end
+	if node_top.name ~= "air" and node_top.name ~= "vacuum:vacuum" then
+		local def = minetest.registered_nodes[node_top.name]
+		if def and def.walkable then
+			return valid, false
+		end
+	end
+
+	return valid, true
+end
+
+function telemosaic.check_beacon(pos, player_name, all_checks)
+	local meta = minetest.get_meta(pos)
+
+	local dest = unhash_pos(meta:get_string("telemosaic:dest"))
+	local state = telemosaic.get_state(pos)
+	if not dest or state == "invalid" then
+		return false
+	end
+
+	local dist = vector.distance(pos, dest)
+	local range = telemosaic.beacon_range
+
+	local pos1 = {x = pos.x - 3, y = pos.y - 1, z = pos.z - 3}
+	local pos2 = {x = pos.x + 3, y = pos.y, z = pos.z + 3}
+	local _, nodes = minetest.find_nodes_in_area(pos1, pos2, "group:telemosaic_extender")
+
+	for node_name, num in pairs(nodes) do
+		range = range + (minetest.get_item_group(node_name, "telemosaic_extender") * num)
+	end
+
+	if dist > range then
+		-- Destination out of range, set beacon to error state
+		telemosaic.set_state(pos, "error")
+		if player_name then
+			local needed = math.ceil(dist - range)
+			minetest.chat_send_player(player_name,
+				S("You need to add extenders for @1 node(s).", needed)
+			)
+		end
+		return false
+	elseif state == "error" or state == "off" then
+		-- Not out of range anymore, set to active
+		telemosaic.set_state(pos, "active")
+	end
+
+	if not all_checks then
+		return true  -- Skip the destination check
+	end
+
+	if player_name then
+		if telemosaic.is_protected_beacon(dest, player_name) then
+			minetest.chat_send_player(player_name,
+				S("Destination is protected.")
+			)
+			return false
+		end
+	end
+
+	local valid, open = telemosaic.is_valid_destination(dest)
+	if not valid then
+		if player_name then
+			minetest.chat_send_player(player_name,
+				S("No telemosaic at destination.")
+			)
+		end
+		return false
+	elseif not open then
+		if player_name then
+			minetest.chat_send_player(player_name,
+				S("Destination is blocked.")
+			)
+		end
+		return false
+	end
+
+	return true
+end
+
+function telemosaic.get_destination(pos)
+	local dest_hash = minetest.get_meta(pos):get_string("telemosaic:dest")
+	return unhash_pos(dest_hash)
+end
+
+function telemosaic.set_destination(pos, dest)
+	local dest_hash = hash_pos(dest)
+	local src_hash = hash_pos(pos)
+	if src_hash == dest_hash or not telemosaic.is_valid_destination(dest) then
+		return  -- Don't allow setting invalid destination
+	end
+	minetest.get_meta(pos):set_string("telemosaic:dest", dest_hash)
+	telemosaic.check_beacon(pos)
+end
+
+function telemosaic.teleport(player, src, dest)
+	local player_name = player:get_player_name()
+
+	-- Prevent teleport spamming
+	recent_teleports[player_name] = true
+	minetest.after(telemosaic.teleport_delay,
+		function(name)
+			recent_teleports[name] = nil
+		end,
+		player_name
+	)
+
+	if telemosaic.digilines then
+		-- Send a digiline message about the teleport
+		local channel = minetest.get_meta(src):get("channel") or telemosaic.default_channel
+		digilines.receptor_send(src, digilines.rules.default, channel, {
+			player = player_name,
+			origin = src,
+			target = dest,
+			pos = src,
+			destination = dest,
+		})
+	end
+
+	dest.y = dest.y + 0.5  -- Teleport the player to above the telemosaic
+	player:set_pos(dest)
+
+	minetest.sound_play({name = "telemosaic_departure", gain = 1}, {pos = src, max_hear_distance = 30})
+	minetest.sound_play({name = "telemosaic_arrival", gain = 1}, {pos = dest, max_hear_distance = 30})
+
+	minetest.add_particlespawner({
+		amount = 100,
+		time = 0.25,
+		minpos = {x = src.x, y = src.y + 0.3, z = src.z},
+		maxpos = {x = src.x, y = src.y + 2, z = src.z},
+		minvel = {x = 1, y = -6, z = 1},
+		maxvel = {x = -1, y = -1, z = -1},
+		minacc = {x = 0, y = -2, z = 0},
+		maxacc = {x = 0, y = -6, z = 0},
+		minexptime = 0.1,
+		minsize = 0.5,
+		maxsize = 1.5,
+		texture = "telemosaic_particle_departure.png",
+		glow = 15,
+	})
+	minetest.add_particlespawner({
+		amount = 100,
+		time = 0.25,
+		minpos = {x = dest.x, y = dest.y + 0.3, z = dest.z},
+		maxpos = {x = dest.x, y = dest.y + 2, z = dest.z},
+		minvel = {x = -1, y = 1, z = -1},
+		maxvel = {x = 1, y = 6, z = 1},
+		minacc = {x = 0, y = -2, z = 0},
+		maxacc = {x = 0, y = -6, z = 0},
+		minexptime = 0.1,
+		minsize = 0.5,
+		maxsize = 1.5,
+		texture = "telemosaic_particle_arrival.png",
+		glow = 15,
+	})
+end
+
+function telemosaic.rightclick(pos, node, player, itemstack, pointed_thing)
+	if not itemstack or player.is_fake_player or not minetest.is_player(player) then
+		return itemstack  -- No fake players!
+	end
+
+	local item = itemstack:get_name()
+	local player_name = player:get_player_name()
+	local state = telemosaic.get_state(pos)
+
+	if item == "default:mese_crystal_fragment" then
+		-- Try to create a telemosaic key
+		if itemstack:get_count() ~= 1 then
+			minetest.chat_send_player(player_name,
+				S("You can only use a singular mese crystal fragment to create a telemosaic key.")
+			)
+		else
+			minetest.log("action", "[telemosaic] " .. player_name ..
+				" created a key for the telemosaic at "
+				.. minetest.pos_to_string(pos))
+			return ItemStack({name = "telemosaic:key", metadata = hash_pos(pos)})
+		end
+
+	elseif item == "telemosaic:key" then
+		-- Try to set a new destination
+		local dest_hash = itemstack:get_meta():get_string("")
+		local src_hash = hash_pos(pos)
+		if dest_hash ~= src_hash and not minetest.is_protected(pos, player_name) then
+			local dest = unhash_pos(dest_hash)
+			if not dest then
+				-- This should never happen, but tell the player if it does
+				minetest.chat_send_player(player_name,
+					S("Telemosaic key is invalid.")
+				)
+			elseif not telemosaic.is_valid_destination(dest) then
+				-- No point setting a destination that doesn't exist
+				minetest.chat_send_player(player_name,
+					S("No telemosaic at new destination.")
+				)
+			else
+				-- Everything is good, set the destination and update the telemosaic
+				minetest.get_meta(pos):set_string("telemosaic:dest", dest_hash)
+				telemosaic.check_beacon(pos, player_name)
+				minetest.log("action", "[telemosaic] " .. player_name .. " set the destination pos of the telemosaic at "
+					.. minetest.pos_to_string(pos)  .. " to " .. minetest.pos_to_string(dest))
+			end
+			if player:get_player_control().sneak then
+				return itemstack  -- Don't destroy key
+			end
+			return ItemStack("default:mese_crystal_fragment")
+		end
+
+	elseif state == "off" or player:get_player_control().sneak then
+		-- Allow player to build on telemosaic
+		local def = minetest.registered_nodes[item]
+		if def and def.on_place and pointed_thing and not vector.equals(pos, pointed_thing.above) then
+			-- Need to create a fake pointed_thing to prevent recursion
+			local new_pointed_thing = {
+				type = "node",
+				under = vector.new(pointed_thing.above),
+				above = vector.new(pointed_thing.above)
+			}
+			return def.on_place(itemstack, player, new_pointed_thing)
+		end
+
+	elseif state == "active" and not telemosaic.is_protected_beacon(pos, player_name) then
+		if recent_teleports[player_name] then
+			return itemstack  -- Prevent teleport spamming, fail silently
+		end
+		local meta = minetest.get_meta(pos)
+		local dest = unhash_pos(meta:get_string("telemosaic:dest"))
+		if telemosaic.check_beacon(pos, player_name, true) then
+			if telemosaic.travel_allowed(player, pos, dest) then
+				-- Teleport the player!
+				minetest.log("action", "[telemosaic] teleporting " .. player_name .. " from "
+					.. minetest.pos_to_string(pos) .. " to " .. minetest.pos_to_string(dest))
+				telemosaic.teleport(player, pos, dest)
+			else
+				minetest.chat_send_player(player_name,
+					S("Travel to destination is not allowed.")
+				)
+			end
+		end
+
+	elseif state == "disabled" then
+		-- Tell the player why they can't use this telemosaic
+		minetest.chat_send_player(player_name,
+			S("Telemosaic is disabled.")
+		)
+
+	elseif state == "error" then
+		-- Check why the beacon is in error state, and tell the player
+		telemosaic.check_beacon(pos, player_name)
+	end
+	return itemstack
+end
+
+function telemosaic.extender_place(pos, player, itemstack, pointed_thing)
+	local pos1 = {x = pos.x - 3, y = pos.y, z = pos.z - 3}
+	local pos2 = {x = pos.x + 3, y = pos.y + 1, z = pos.z + 3}
+	local nodes = minetest.find_nodes_in_area(pos1, pos2, "group:telemosaic_error")
+
+	for _, node_pos in pairs(nodes) do
+		-- Update telemosaic, and tell them if they need more extenders
+		telemosaic.check_beacon(node_pos, player:get_player_name())
+	end
+end
+
+function telemosaic.extender_dig(pos, oldnode, oldmetadata, player)
+	local pos1 = {x = pos.x - 3, y = pos.y, z = pos.z - 3}
+	local pos2 = {x = pos.x + 3, y = pos.y + 1, z = pos.z + 3}
+	local nodes = minetest.find_nodes_in_area(pos1, pos2, {"group:telemosaic_active", "group:telemosaic_disabled"})
+
+	for _, node_pos in pairs(nodes) do
+		-- Update the telemosaic, but don't tell the player anything, they are probably removing it anyway
+		telemosaic.check_beacon(node_pos)
+	end
+end

mods/telemosaic/init.lua

@@ -0,0 +1,49 @@
+--[[
+
+Telemosaic [telemosaic]
+=======================
+
+A mod which provides player-placed teleport pads
+
+Copyright (C) 2015 Ben Deutsch <ben@bendeutsch.de>
+
+]]
+
+telemosaic = {
+	teleport_delay = tonumber(minetest.settings:get("telemosaic_teleport_delay")) or 1.0,
+	beacon_range = tonumber(minetest.settings:get("telemosaic_beacon_range")) or 20.0,
+	default_channel = minetest.settings:get("telemosaic_default_channel") or "telemosaic",
+	extender_ranges = {
+		tonumber(minetest.settings:get("telemosaic_extender_one_range")) or 5.0,
+		tonumber(minetest.settings:get("telemosaic_extender_two_range")) or 20.0,
+		tonumber(minetest.settings:get("telemosaic_extender_three_range")) or 80.0,
+	},
+	extender_colors = {
+		white = "#ffffffa0",
+		dark_grey = "#00000090",
+		black = "#000000e0",
+		violet = "#400080b0",
+		blue = "#0000ffb0",
+		cyan = "#00ffffb0",
+		dark_green = "#007000b0",
+		green = "#00ff00b0",
+		yellow = "#ffff00b0",
+		brown = "#402000c0",
+		orange = "#ff8000b0",
+		red = "#ff0000b0",
+		magenta = "#ff00ffb0",
+		pink = "#ff8080b0",
+	},
+}
+
+local MP = minetest.get_modpath("telemosaic")
+
+if minetest.get_modpath("digilines") then
+	dofile(MP.."/digilines.lua")
+end
+
+dofile(MP.."/functions.lua")
+dofile(MP.."/beacon.lua")
+dofile(MP.."/extender.lua")
+dofile(MP.."/key.lua")
+dofile(MP.."/abm.lua")

mods/telemosaic/key.lua

@@ -0,0 +1,38 @@
+local S = minetest.get_translator("telemosaic")
+
+minetest.register_tool("telemosaic:key", {
+	description = S("Telemosaic Key"),
+	inventory_image = "telemosaic_key.png",
+	stack_max = 1,
+	groups = {not_in_creative_inventory = 1},
+	on_use = function(itemstack, player, pointed_thing)
+		if pointed_thing.type == "node" then
+			-- Use key to toggle telemosaic on/off
+			local name = player:get_player_name()
+			local pos = pointed_thing.under
+			local state = telemosaic.get_state(pos)
+			if state == "active" and not minetest.is_protected(pos, name) then
+				telemosaic.set_state(pos, "disabled")
+			elseif state == "disabled" and not minetest.is_protected(pos, name) then
+				telemosaic.set_state(pos, "active")
+			end
+		end
+		return itemstack
+	end,
+	on_place = function(itemstack, player, pointed_thing)
+		-- Call on_rightclick, even if sneak is pressed
+		if pointed_thing.type == "node" and player then
+			local node = minetest.get_node(pointed_thing.under)
+			local def = minetest.registered_nodes[node.name]
+			if def and def.on_rightclick then
+				return def.on_rightclick(pointed_thing.under, node, player, itemstack, pointed_thing) or itemstack
+			end
+		end
+	end,
+})
+
+minetest.register_craft({
+	type = "shapeless",
+	recipe = {"telemosaic:key"},
+	output = "default:mese_crystal_fragment"
+})

mods/telemosaic/locale/telemosaic.de.tr

@@ -0,0 +1,44 @@
+# textdomain: telemosaic
+##[ beacon.lua ]##
+Protected Telemosaic Beacon=Geschütztes Telemosaik-Leuchtfeuer
+Telemosaic Beacon=Telemosaik-Leuchtfeuer
+Telemosaic Beacon Active (you hacker you!)=Telemosaik-Leuchtfeuer aktiv (du Hacker du!)
+Protected Telemosaic Beacon Active (you hacker you!)=Geschütztes Telemosaik-Leuchtfeuer aktiv (du Hacker du!)
+Telemosaic Beacon Error (you hacker you!)=Telemosaik-Leuchtfeuer fehlerhaft (du Hacker du!)
+Protected Telemosaic Beacon Error (you hacker you!)=Geschütztes Telemosaik-Leuchtfeuer fehlerhaft (du Hacker du!)
+Telemosaic Beacon Disabled (you hacker you!)=Telemosaik-Leuchtfeuer deaktiviert (du Hacker du!)
+Protected Telemosaic Beacon Disabled (you hacker you!)=Geschütztes Telemosaik-Leuchtfeuer deaktiviert (du Hacker du!)
+
+##[ extender.lua ]##
+Telemosaic Extender, Tier @1 (@2)=Telemosaik-Verstärker Stufe @1 (@2)
+Telemosaic Extender, Tier @1=Telemosaik-Verstärker Stufe @1
+# Aus MTG Wolle
+Grey=Grau
+White=Weiß
+Dark Grey=Dunkelgrau
+Black=Schwarz
+Violet=Violett
+Blue=Blau
+Cyan=Türkis
+Dark Green=Dunkelgrün
+Green=Grün
+Yellow=Gelb
+Brown=Braun
+Orange=Orange
+Red=Rot
+Magenta=Magenta
+Pink=Rosa
+
+##[ functions.lua ]##
+You need to add extenders for @1 node(s).=Sie müssen Verstärker für @1 Node(n) hinzufügen.
+Destination is protected.=Zielort ist geschützt.
+No telemosaic at destination.=Kein Telemosaik am Zielort.
+Destination is blocked.=Zielort ist blockiert.
+You can only use a singular mese crystal fragment to create a telemosaic key.=Sie können nur ein einzelnes Mesekristallfragment verwenden, um einen Telemosaik-Schlüssel zu erstellen.
+Telemosaic key is invalid.=Telemosaik-Schlüssel ist ungültig.
+No telemosaic at new destination.=Kein Telemosaik am neuen Zielort.
+Travel to destination is not allowed.=Reisen zum Zielort ist nicht erlaubt.
+Telemosaic is disabled.=Telemosaik ist deaktiviert.
+
+##[ key.lua ]##
+Telemosaic Key=Telemosaik-Schlüssel

mods/telemosaic/locale/template.txt

@@ -0,0 +1,44 @@
+# textdomain: telemosaic
+##[ beacon.lua ]##
+Protected Telemosaic Beacon=
+Telemosaic Beacon=
+Telemosaic Beacon Active (you hacker you!)=
+Protected Telemosaic Beacon Active (you hacker you!)=
+Telemosaic Beacon Error (you hacker you!)=
+Protected Telemosaic Beacon Error (you hacker you!)=
+Telemosaic Beacon Disabled (you hacker you!)=
+Protected Telemosaic Beacon Disabled (you hacker you!)=
+
+##[ extender.lua ]##
+Telemosaic Extender, Tier @1 (@2)=
+Telemosaic Extender, Tier @1=
+Grey=
+# from MTG wool
+White=
+Dark Grey=
+Black=
+Violet=
+Blue=
+Cyan=
+Dark Green=
+Green=
+Yellow=
+Brown=
+Orange=
+Red=
+Magenta=
+Pink=
+
+##[ functions.lua ]##
+You need to add extenders for @1 node(s).=
+Destination is protected.=
+No telemosaic at destination.=
+Destination is blocked.=
+You can only use a singular mese crystal fragment to create a telemosaic key.=
+Telemosaic key is invalid.=
+No telemosaic at new destination.=
+Travel to destination is not allowed.=
+Telemosaic is disabled.=
+
+##[ key.lua ]##
+Telemosaic Key=

mods/telemosaic/mod.conf

@@ -0,0 +1,4 @@
+name = telemosaic
+description = A Minetest mod for user-generated teleportation pads.
+depends = default, doors
+optional_depends = dye, digilines

mods/telemosaic/settingtypes.txt

@@ -0,0 +1,17 @@
+#The base range of the teleport beacon
+telemosaic_beacon_range (Beacon range) int 20
+
+#The extending range of the tier 1 extender
+telemosaic_extender_one_range (Extender tier 1 range) int 5
+
+#The extending range of the tier 2 extender
+telemosaic_extender_two_range (Extender tier 2 range) int 20
+
+#The extending range of the tier 3 extender
+telemosaic_extender_three_range (Extender tier 2 range) int 80
+
+#The minimum delay between player teleports
+telemosaic_teleport_delay (Teleport delay) float 1.0
+
+# The default digilines channel for beacons
+telemosaic_default_channel (Default channel) string telemosaic