implement official intllib fallback boilerplate

init.lua

@@ -78,21 +78,19 @@
 travelnet = {};
 
 travelnet.targets = {};
+travelnet.path = minetest.get_modpath(minetest.get_current_modname())
 
--- Boilerplate to support localized strings if intllib mod is installed.
-if minetest.get_modpath( "intllib" ) and intllib then
-	travelnet.S = intllib.Getter()
-else
-	travelnet.S = function(s) return s end
-end
 
-local S = travelnet.S;
+-- Intllib
+local S = dofile(travelnet.path .. "/intllib.lua")
+travelnet.S = S
+
 
 minetest.register_privilege("travelnet_attach", { description = S("allows to attach travelnet boxes to travelnets of other players"), give_to_singleplayer = false});
 minetest.register_privilege("travelnet_remove", { description = S("allows to dig travelnet boxes which belog to nets of other players"), give_to_singleplayer = false});
 
 -- read the configuration
-dofile(minetest.get_modpath("travelnet").."/config.lua"); -- the normal, default travelnet
+dofile(travelnet.path.."/config.lua"); -- the normal, default travelnet
 
 
 
@@ -218,7 +216,7 @@ travelnet.reset_formspec = function( meta )
 
 		"field[0.3,2.8;9,0.9;station_network;"..S("Assign to Network:")..";"..
 			minetest.formspec_escape(station_network or "").."]"..
-		"label[0.3,3.1;"..S("You can have more than one network. If unsure, use \"%s\""):format(tostring(station_network)).."\".]"..
+		"label[0.3,3.1;"..S("You can have more than one network. If unsure, use \"%s\""):format(tostring(station_network))..".]"..
 		"field[0.3,4.4;9,0.9;owner;"..S("Owned by:")..";]"..
 		"label[0.3,4.7;"..S("Unless you know what you are doing, leave this empty.").."]"..
 		"button_exit[1.3,5.3;1.7,0.7;station_help_setup;"..S("Help").."]"..
@@ -901,17 +899,17 @@ end
 
 
 if( travelnet.travelnet_enabled ) then
-   dofile(minetest.get_modpath("travelnet").."/travelnet.lua"); -- the travelnet node definition
+   dofile(travelnet.path.."/travelnet.lua"); -- the travelnet node definition
 end
 if( travelnet.elevator_enabled ) then
-   dofile(minetest.get_modpath("travelnet").."/elevator.lua");  -- allows up/down transfers only
+   dofile(travelnet.path.."/elevator.lua");  -- allows up/down transfers only
 end
 if( travelnet.doors_enabled ) then
-   dofile(minetest.get_modpath("travelnet").."/doors.lua");     -- doors that open and close automaticly when the travelnet or elevator is used
+   dofile(travelnet.path.."/doors.lua");     -- doors that open and close automaticly when the travelnet or elevator is used
 end
 
 if( travelnet.abm_enabled ) then
-   dofile(minetest.get_modpath("travelnet").."/restore_network_via_abm.lua"); -- restore travelnet data when players pass by broken networks
+   dofile(travelnet.path.."/restore_network_via_abm.lua"); -- restore travelnet data when players pass by broken networks
 end
 
 -- upon server start, read the savefile

intllib.lua

@@ -0,0 +1,45 @@
+
+-- Fallback functions for when `intllib` is not installed.
+-- Code released under Unlicense <http://unlicense.org>.
+
+-- Get the latest version of this file at:
+--   https://raw.githubusercontent.com/minetest-mods/intllib/master/lib/intllib.lua
+
+local function format(str, ...)
+	local args = { ... }
+	local function repl(escape, open, num, close)
+		if escape == "" then
+			local replacement = tostring(args[tonumber(num)])
+			if open == "" then
+				replacement = replacement..close
+			end
+			return replacement
+		else
+			return "@"..open..num..close
+		end
+	end
+	return (str:gsub("(@?)@(%(?)(%d+)(%)?)", repl))
+end
+
+local gettext, ngettext
+if minetest.get_modpath("intllib") then
+	if intllib.make_gettext_pair then
+		-- New method using gettext.
+		gettext, ngettext = intllib.make_gettext_pair()
+	else
+		-- Old method using text files.
+		gettext = intllib.Getter()
+	end
+end
+
+-- Fill in missing functions.
+
+gettext = gettext or function(msgid, ...)
+	return format(msgid, ...)
+end
+
+ngettext = ngettext or function(msgid, msgid_plural, n, ...)
+	return format(n==1 and msgid or msgid_plural, ...)
+end
+
+return gettext, ngettext