tntfallback

-------------------------------------------------------------------------------- -- This module implements a wrapper for [[Module:TNT]] that allows returning -- a fallback message; used by {{Documentation}}. -- -- @module TNTFallback -- @alias  p -- @author [[User:ExE Boss]] -- @require [[Module:No globals]] -- @require [[Module:TNT]] --------------------------------------------------------------------------------  require("strict"); local TNT = require("Module:TNT");  local p = {};  -------------------------------------------------------------------------------- -- Based on [[Module:TNT]]'s `msg` function, -- but takes an optional `fallback` parameter. -------------------------------------------------------------------------------- function p.msg(frame) local dataset, key; local params = { n = 0 }; local lang = nil; local fallback = nil;  for k, v in pairs(frame.args) do if (k == 1) then dataset = v; elseif (k == 2) then key = v; elseif (type(k) == "number" and k > 2) then local i = k - 2; params[i] = v; params.n = math.max(params.n, i); elseif ((k == "lang") and (v ~= "_")) then lang = v; elseif ((k == "fallback") and (v ~= "")) then fallback = v; end end  local result; if (lang) then result = TNT.formatInLanguage(lang, dataset, key, unpack(params, 1, params.n)); else result = TNT.format(dataset, key, unpack(params, 1, params.n)); end  if (fallback and ( -- not translated (result and result == TNT.formatInLanguage("en", dataset, key, unpack(params, 1, params.n))) -- no message or (not result) )) then if (not lang) then if (frame:callParserFunction("int:lang") ~= "en") then return mw.message.newRawMessage(fallback, unpack(params, 1, params.n)):plain(); end elseif (lang ~= "en") then return mw.message.newRawMessage(fallback, unpack(params, 1, params.n)):plain(); end end  return result; end  return p;