Editing Module:Sandbox/trappist the monk/layurl

require ('strict');

local data=mw.loadData ('Module:Sandbox/trappist the monk/layurl/data');
local articles_using_layurl_t = data.articles_using_layurl;
local wp_med_articles_t = data.wp_med_articles;
local wp_med_articles_using_layurl_t = {};
local get_args = require ('Module:Arguments').getArgs;


--[[--------------------------< M A I N >----------------------------------------------------------------------

For each article title in articles_using_layurl_t look for that article title in the selected wp:med articles list.
If found add the article title to wp_med_articles_using_layurl_t sequence table.

There are three wp:med article lists:
	all wp:med articles (Category:All WikiProject Medicine articles)
	all wp:med fa articles (Category:FA-Class medicine articles)
	all wp:med ga articles (Category:GA-Class medicine articles)
	
{{#invoke:Sandbox/trappist_the_monk/layurl|main|list=|fa=|ga=}}
	|list=yes – return an unordered list of wikilinked articles from the selected wp:med list that use |lay-url=
	|fa=yes – target list is wp_med_fa_articles
	|ga=yes – target list is wp_med_ga_articles
	when neither |fa=yes not |ga=yes then target list is wp_med_articles

]]

local function main (frame)
	local args_t = get_args (frame);
	local list_t;																-- holds the chosen wp:med article list
	
	if 'yes' == args_t.fa then
		list_t = data.wp_med_fa_articles;										-- use the featured articles list
	elseif 'yes' == args_t.ga then
		list_t = data.wp_med_ga_articles;										-- use the good articles list
	else
		list_t = data.wp_med_articles;											-- use the list of all wp:med articles
	end

	for title, _ in pairs (articles_using_layurl_t) do							-- get next title from <articles_using_layurl_t>
		if list_t[title] then													-- is <title> in selected wp:med <list_t>?
			title = '*[[' .. title .. ']]';										-- yes, make a wikilink with unordered=list markup
			table.insert (wp_med_articles_using_layurl_t, title);				-- add wikilinked <title> to <wp_med_articles_using_layurl_t>
		end
	end

	if 'yes' == args_t['list'] then
		table.sort (wp_med_articles_using_layurl_t);							-- sort the results
		return table.concat (wp_med_articles_using_layurl_t, '\n');				-- return an unordered list of article titles
	end
	
	return #wp_med_articles_using_layurl_t;										-- return the total number of titles found
end


--[[--------------------------< E X P O R T >------------------------------------------------------------------
]]

return {
	main = main,
	}