-- This module implements Template:Transclude random subpage. It is alpha software.	  local p = {}  local mRandom = require('Module:Random') local convert = require('মডিউল:সংখ্যা রূপান্তরকারী').convert local currentTitle = mw.title.getCurrentTitle()  -- tracking function added by BHG 29/04/2019 -- called as subPageTrackingCategories(pages, args.max) local function subPageTrackingCategories(pages, max) 	local retval = ""; 	local availableSubPageCount = 0; 	local i; 	local thispagetitle = mw.title.getCurrentTitle().text  	-- don't track DYK etc, only selected/featured articles, biogs etc 	if ((string.find(pages.subpage, "/[sS]elected") == -1) and (string.find(pages.subpage, "/[fF]eatured") == -1)) then 		return retval 	end 	-- no tracking unless we are in Portal namespace 	if (mw.title.getCurrentTitle().nsText ~= "Portal") then 		return "" 	end -- no tracking if this is a subpage 	if ((mw.ustring.match(thispagetitle, "/") ~= nil) and (thispagetitle ~= "AC/DC")) then 		return retval 	end 	 	if (max == nil) then 		return "" 	end  	-- limit checking to prevent Lua overload 	local myMaxCheck = 60 	if tonumber(max) < myMaxCheck then 		myMaxCheck = tonumber(max) 	end 	for i=1,myMaxCheck do  		local aSubPage = mw.title.new(pages.subpage .. '/' .. i) 		if (aSubPage.exists) then 			availableSubPageCount = availableSubPageCount + 1; 		end 	end 	if myMaxCheck >= tonumber(max) then 		if (availableSubPageCount < tonumber(max)) then 			retval = retval .. "" 		elseif (availableSubPageCount > tonumber(max)) then 			retval = retval .. "" 		end 	end 	-- before categorising, check what type of subpage we are categorising, and if detected, categorise images separately 	local subpageType = "subpages" -- generic type 	local subpageName = pages.subpage 	subpageName = mw.ustring.gsub(subpageName, "^[^/]*/", "") 	subpageName = mw.ustring.lower(subpageName) 	if ((mw.ustring.find(subpageName, "picture", 1, true) ~= nil) or 		(mw.ustring.find(subpageName, "image", 1, true) ~= nil) or 		(mw.ustring.find(subpageName, "panorama", 1, true) ~= nil)) then 		subpageType = "image subpages" 	end 	if (availableSubPageCount < 2) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 5) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 10) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 15) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 20) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 25) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 30) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 40) then 		retval = retval .. "" 	elseif (availableSubPageCount <= 50) then 		retval = retval .. "" 	else 		retval = retval .. "" 	end 	return retval; end  local function getRandomNumber(max) 	-- gets a random integer between 1 and max; max defaults to 1 	return mRandom.number{max or 1} end  local function expandArg(args, key) 	-- Emulate how unspecified template parameters appear in wikitext. If the 	-- specified argument exists, its value is returned, and if not the argument 	-- name is returned inside triple curly braces. 	local val = args[key] 	if val then 		return val 	else 		return string.format('', key) 	end end  local function getPages(args) 	local pages = {} 	pages.root = args.rootpage or currentTitle.prefixedText 	pages.subpage = pages.root .. '/' .. expandArg(args, 'subpage') 	pages.random = pages.subpage .. '/' .. convert('bn', tostring(getRandomNumber(args.max))) 	return pages end  local function tryExpandTemplate(frame, title, args) 	local success, result = pcall(frame.expandTemplate, frame, {title = title, args = args}) 	if success then 		return result 	else 		local msg = string.format( 			'"%s" নামক কোন পাতার অস্তিত্ব নেই।', 			title 		) 		if mw.title.getCurrentTitle().namespace == 100 then -- is in the portal namespace 			msg = msg .. 'বিষয়শ্রেণী:প্রবেশদ্বারে দৃষ্টি আকর্ষণ প্রয়োজন' 		end 		return msg 	end end  local function getRandomSubpageContent(frame, pages) 	return tryExpandTemplate( 		frame, 		pages.random 	) end  function p._main(args, frame) 	frame = frame or mw.getCurrentFrame() 	local pages = getPages(args)  	local ret = {} 	ret[#ret + 1] = getRandomSubpageContent(frame, pages)  	return table.concat(ret, '\n') .. subPageTrackingCategories(pages, args.max, args.header) end  function p._nominate(args, frame) 	frame = frame or mw.getCurrentFrame() 	local pages = getPages(args) 	 	local ret = {} 	ret[#ret + 1] = getRandomSubpageContent(frame, pages)  	return table.concat(ret, '\n') .. subPageTrackingCategories(pages, args.max, args.header) end  local function makeInvokeFunction(func) 	return function (frame) 		local args = require('Module:Arguments').getArgs(frame, { 			trim = false, 			removeBlanks = false, 			wrappers = { 				'টেমপ্লেট:Transclude random subpage', 				'Template:Transclude random subpage/BHG-test', 			} 		}) 		return func(args, frame) 	end end  p.main = makeInvokeFunction(p._main)  return p