Editing Module:Sandbox/DavNvro

-- DavNvro, Google Code-in 2019, Introduction to Lua in Wikipedia

-- Task #2: Working with modules

local p = {}

function p.hello(frame)
	return "Hello, world!"
end

p.Hi = function(frame)
	strName = frame.args.name or "Jimmy"
	return "Hello from Lua to my friend " .. strName .. ".<br>"
end

-- Task #3: Calculations and tests

p.converttemp = function(frame)
	local cels = tonumber(frame.args.celsius) or 0
	local fahr = ((cels * 9) / 5) + 32
	local msg = cels.." degrees Celsius is "..fahr.." degrees Fahrenheit."
	
	if (cels > 9) then
		msg = msg.." It is warm."
	else
		msg = msg.." It is cold."
	end
	
	return msg
end

-- Task #4: Loops and tables

function p.timestable(frame)
	local numb = tonumber( frame.args.numb ) or 2
	local out = numb.." times table<br>"

	for i = 1, 12 do
		out = out..numb.." times "..i.." is equal to "..i * numb.."<br>"
	end

	return out
end

function p.people(frame)
	local friends = {"Agnetha", "Betty", "Carlos", "Davinder", "Eloise", "Bob", "Robbie", "Tim"}
	local msg = ""
	
	for i = 1, #friends do
		msg = msg .. "Hello " .. friends[i] .. "<br>"
	end
	
	return msg
end

-- Task #5: Lua libraries

function p.sent(frame)
	local txt = frame.args.text or ""
	return string.upper(string.sub(txt, 1, 1))..string.sub(txt, 2)
end

function p.unpack(frame)
	local dmy = frame.args.dmydate or ""
	local d, m, y = string.match(dmy, "(%d+) (%w+) (%d+)")
	return "Year = " .. y .. "<br>Day = " .. d .. "<br>Month = " .. m
end

-- Task #6: MediaWiki libraries

function p.langs(frame)
	local langslist = mw.language.fetchLanguageNames()
	local out = ""
	local count = 0

	for k, v in pairs(langslist) do
		out = out .. k .. " - " .. v .. "<br>"
		count = count + 1
	end

	return out .. "<br>= " .. count .. " languages"
end

function p.fallbacklangs(frame)
	local lang = frame.args.langcode or "en";
	local fallbacks = mw.language.getFallbacksFor(lang);
	local out = "";
	
	for i = 1, #fallbacks do
		local fallbackLang = fallbacks[i]
		out = out..fallbackLang.." - "..mw.language.fetchLanguageName(fallbackLang, fallbackLang).."<br/>"
	end
	
	out = "Language fallbacks for "..mw.language.fetchLanguageName(lang, "en").." ("..mw.language.fetchLanguageName(lang, lang)..") are: <br/>"..out
	
	return out.."<br/>"
end

p.pgtitle = function( frame )
	local title = frame.args.title
	local ttlobj = mw.title.new( title )
	local txt = ttlobj.text

	return txt
end

function p.pginfo(frame)
	local pageTitle = frame.args.title or ""
	local page = mw.title.new(pageTitle)
	
	if page == nil then
		return "invalid title"
	end
	
	local out = page.text.." "
	
	if page.exists then
		out = out.."exists "
	else
		out = out.."does not exist "
	end
	
	out = out.."and is "
	
	if not page.isRedirect then
		out = out.."not "
	end
	
	out = out.."a redirect"
	
	return out
end

return p