Editing Module:Transclude random subpage/BHG-test

-- This module implements [[Template:Transclude random subpage]]. It is alpha software.	

local p = {}

local mRandom = require('Module:Random')
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;
	-- don't track DYK etc, only selected articles etc
	if (string.find(pages.subpage, "/[sS]elected") == -1) then
		return retval
	end
	-- no tracking unless we are in Portal namespace
	if (mw.title.getCurrentTitle().nsText ~= "Portal") 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 .. "[[Category:Random portal component with fewer available subpages than specified max]]"
		elseif (availableSubPageCount > tonumber(max)) then
			retval = retval .. "[[Category:Random portal component with more available subpages than specified max]]"
		end
	end
	if (availableSubPageCount < 2) then
		retval = retval .. "[[Category:Random portal component with less than 2 available  subpages]]"
	elseif (availableSubPageCount <= 5) then
		retval = retval .. "[[Category:Random portal component with 2–5 available  subpages]]"
	elseif (availableSubPageCount <= 10) then
		retval = retval .. "[[Category:Random portal component with 6–10 available  subpages]]"
	elseif (availableSubPageCount <= 15) then
		retval = retval .. "[[Category:Random portal component with 11–15 available  subpages]]"
	elseif (availableSubPageCount <= 20) then
		retval = retval .. "[[Category:Random portal component with 16–20 available subpages]]"
	elseif (availableSubPageCount <= 25) then
		retval = retval .. "[[Category:Random portal component with 21–25 available subpages]]"
	elseif (availableSubPageCount <= 30) then
		retval = retval .. "[[Category:Random portal component with 26–30 available subpages]]"
	elseif (availableSubPageCount <= 40) then
		retval = retval .. "[[Category:Random portal component with 31–40 available subpages]]"
	elseif (availableSubPageCount <= 50) then
		retval = retval .. "[[Category:Random portal component with 41–50 available subpages]]"
	else
		retval = retval .. "[[Category:Random portal component with over 50 available subpages]]"
	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('{{{%s}}}', 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 .. '/' .. 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(
			'<strong class="error">The page "[[%s]]" does not exist.</strong>',
			title
		)
		if mw.title.getCurrentTitle().namespace == 100 then -- is in the portal namespace
			msg = msg .. '[[Category:Portals needing attention]]'
		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 = {
				'Template:Transclude random subpage',
				'Template:Transclude random subpage/BHG-test',
			}
		})
		return func(args, frame)
	end
end

p.main = makeInvokeFunction(p._main)

return p