Epic/mods/unified_inventory/waypoints.lua

local S = minetest.get_translator("unified_inventory")
local F = minetest.formspec_escape

local hud_colors = {
	{"#FFFFFF", 0xFFFFFF, S("White")},
	{"#DBBB00", 0xf1d32c, S("Yellow")},
	{"#DD0000", 0xDD0000, S("Red")},
	{"#2cf136", 0x2cf136, S("Green")},
	{"#2c4df1", 0x2c4df1, S("Blue")},
}

local hud_colors_max = #hud_colors

-- Stores temporary player data (persists until player leaves)
local waypoints_temp = {}

unified_inventory.register_page("waypoints", {
	get_formspec = function(player)
		local player_name = player:get_player_name()

		-- build a "fake" temp entry if the server took too long
		-- during sign-on and returned an empty entry
		if not waypoints_temp[player_name] then waypoints_temp[player_name] = {hud = 1} end

		local waypoints = datastorage.get(player_name, "waypoints")
		local formspec = "background[0,4.5;8,4;ui_main_inventory.png]" ..
			"image[0,0;1,1;ui_waypoints_icon.png]" ..
			"label[1,0;" .. F(S("Waypoints")) .. "]"

		-- Tabs buttons:
		for i = 1, 5, 1 do
			formspec = formspec ..
				"image_button[0.0," .. 0.2 + i * 0.7 .. ";.8,.8;" ..
				(i == waypoints.selected and "ui_blue_icon_background.png^" or "") ..
				"ui_" .. i .. "_icon.png;" ..
				"select_waypoint" .. i .. ";]" ..
				"tooltip[select_waypoint" .. i .. ";"
					.. S("Select Waypoint #@1", i).."]"
		end

		local i = waypoints.selected or 1
		local waypoint = waypoints[i] or {}
		local temp = waypoints_temp[player_name][i] or {}
		local default_name = S("Waypoint @1", i)

		-- Main buttons:
		formspec = formspec ..
			"image_button[4.5,3.7;.8,.8;"..
			"ui_waypoint_set_icon.png;"..
			"set_waypoint"..i..";]"..
			"tooltip[set_waypoint" .. i .. ";"
				.. F(S("Set waypoint to current location")).."]"

		formspec = formspec ..
			"image_button[5.2,3.7;.8,.8;"..
			(waypoint.active and "ui_on_icon.png" or "ui_off_icon.png")..";"..
			"toggle_waypoint"..i..";]"..
			"tooltip[toggle_waypoint" .. i .. ";"
				.. F(S("Make waypoint @1",
					waypoint.active and S("invisible") or S("visible"))).."]"

		formspec = formspec ..
			"image_button[5.9,3.7;.8,.8;"..
			(waypoint.display_pos and "ui_green_icon_background.png" or "ui_red_icon_background.png").."^ui_xyz_icon.png;"..
			"toggle_display_pos" .. i .. ";]"..
			"tooltip[toggle_display_pos" .. i .. ";"
				.. F(S("@1 display of waypoint coordinates",
					waypoint.display_pos and S("Disable") or S("Enable"))) .."]"

		formspec = formspec ..
			"image_button[6.6,3.7;.8,.8;"..
			"ui_circular_arrows_icon.png;"..
			"toggle_color"..i..";]"..
			"tooltip[toggle_color" .. i .. ";"
				.. F(S("Change color of waypoint display")).."]"

		formspec = formspec ..
			"image_button[7.3,3.7;.8,.8;"..
			"ui_pencil_icon.png;"..
			"rename_waypoint"..i..";]"..
			"tooltip[rename_waypoint" .. i .. ";"
				.. F(S("Edit waypoint name")).."]"

		-- Waypoint's info:
		if waypoint.active then
			formspec = formspec .. 	"label[1,0.8;"..F(S("Waypoint active")).."]"
		else
			formspec = formspec .. 	"label[1,0.8;"..F(S("Waypoint inactive")).."]"
		end

		if temp.edit then
			formspec = formspec ..
				"field[1.3,3.2;6,.8;rename_box" .. i .. ";;"
				..(waypoint.name or default_name).."]" ..
				"image_button[7.3,2.9;.8,.8;"..
				"ui_ok_icon.png;"..
				"confirm_rename"..i.. ";]"..
				"tooltip[confirm_rename" .. i .. ";"
					.. F(S("Finish editing")).."]"
		end

		formspec = formspec .. "label[1,1.3;"..F(S("World position"))..": " ..
			minetest.pos_to_string(waypoint.world_pos or vector.new()) .. "]" ..
			"label[1,1.8;"..F(S("Name"))..": ".. (waypoint.name or default_name) .. "]" ..
			"label[1,2.3;"..F(S("HUD text color"))..": " ..
			hud_colors[waypoint.color or 1][3] .. "]"

		return {formspec=formspec}
	end,
})

unified_inventory.register_button("waypoints", {
	type = "image",
	image = "ui_waypoints_icon.png",
	tooltip = S("Waypoints"),
	hide_lite=true
})

local function update_hud(player, waypoints, temp, i)
	local waypoint = waypoints[i]
	if not waypoint then return end
	temp[i] = temp[i] or {}
	temp = temp[i]
	local pos = waypoint.world_pos or vector.new()
	local name
	if waypoint.display_pos then
		name = minetest.pos_to_string(pos)
		if waypoint.name then
			name = name..", "..waypoint.name
		end
	else
		name = waypoint.name or "Waypoint "..i
	end
	if temp.hud then
		player:hud_remove(temp.hud)
	end
	if waypoint.active then
		temp.hud = player:hud_add({
			hud_elem_type = "waypoint",
			number = hud_colors[waypoint.color or 1][2] ,
			name = name,
			text = "m",
			world_pos = pos
		})
	else
		temp.hud = nil
	end
end

minetest.register_on_player_receive_fields(function(player, formname, fields)
	if formname ~= "" then return end

	local player_name = player:get_player_name()
	local update_formspec = false
	local need_update_hud = false
	local hit = false

	local waypoints = datastorage.get(player_name, "waypoints")
	local temp = waypoints_temp[player_name]
	for i = 1, 5, 1 do
		if fields["select_waypoint"..i] then
			hit = true
			waypoints.selected = i
			update_formspec = true
		end

		if fields["toggle_waypoint"..i] then
			hit = true
			waypoints[i] = waypoints[i] or {}
			waypoints[i].active = not (waypoints[i].active)
			need_update_hud = true
			update_formspec = true
		end

		if fields["set_waypoint"..i] then
			hit = true
			local pos = player:get_pos()
			pos.x = math.floor(pos.x)
			pos.y = math.floor(pos.y)
			pos.z = math.floor(pos.z)
			waypoints[i] = waypoints[i] or {}
			waypoints[i].world_pos = pos
			need_update_hud = true
			update_formspec = true
		end

		if fields["rename_waypoint"..i] then
			hit = true
			temp[i] = temp[i] or {}
			temp[i].edit = true
			update_formspec = true
		end

		if fields["toggle_display_pos"..i] then
			hit = true
			waypoints[i] = waypoints[i] or {}
			waypoints[i].display_pos = not waypoints[i].display_pos
			need_update_hud = true
			update_formspec = true
		end

		if fields["toggle_color"..i] then
			hit = true
			waypoints[i] = waypoints[i] or {}
			local color = waypoints[i].color or 1
			color = color + 1
			if color > hud_colors_max then
				color = 1
			end
			waypoints[i].color = color
			need_update_hud = true
			update_formspec = true
		end

		if fields["confirm_rename"..i] then
			hit = true
			waypoints[i] = waypoints[i] or {}
			temp[i].edit = false
			waypoints[i].name = fields["rename_box"..i]
			need_update_hud = true
			update_formspec = true
		end
		if need_update_hud then
			update_hud(player, waypoints, temp, i)
		end
		if update_formspec then
			unified_inventory.set_inventory_formspec(player, "waypoints")
		end
		if hit then return end
	end
end)


minetest.register_on_joinplayer(function(player)
	local player_name = player:get_player_name()
	local waypoints = datastorage.get(player_name, "waypoints")
	local temp = {}
	waypoints_temp[player_name] = temp
	for i = 1, 5 do
		update_hud(player, waypoints, temp, i)
	end
end)

minetest.register_on_leaveplayer(function(player)
	waypoints_temp[player:get_player_name()] = nil
end)