Module:Year in sports

local getArgs = require('Module:Arguments').getArgs
local sidebar = require('Module:Sidebar')
local list = require('Module:List')
local parser = mw.ext.ParserFunctions

local sports = {
	"American football",
	"aquatic sports",
	"association football",
	"badminton",
	"baseball",
	"basketball",
	"chess",
	"climbing",
	"combat sports",
	"sumo",
	"cycling",
	"equestrianism",
	"esports",
	"golf",
	"gymnastics",
	"ice sports",
	"modern pentathlon",
	"motorsport",
	"racquetball",
	"sailing",
	"skiing",
	"squash",
	"table tennis",
	"tennis",
	"triathlon",
	"volleyball",
	"weightlifting"
}

local p = {}

function p.main(frame)
	local args = getArgs(frame)
	
	return p._main(frame, args)
end

function p._main(frame, args)
	local year = args[1] or args['year'] or os.date("%Y")
	
	local pages = {}
	
	for i, sport in ipairs(sports) do
		local s = year .. " in " .. sport
		local page = mw.title.new(s, 0)
		
		if (page.exists) then
			table.insert(pages, "[[" .. s .. "|" .. sport:gsub("^%l", string.upper) .. "]]")
		end
	end
	
	local l = list.horizontal(pages)
	
	local below = year
	
	if (mw.title.new((year - 1) .. " in sports")) then
		below = "[[" .. (year - 1) .. " in sports|" .. (year - 1) .. "]] " .. below
	end
	if (mw.title.new((year - 2) .. " in sports")) then
		below = "[[" .. (year - 2) .. " in sports|" .. (year - 2) .. "]] " .. below
	end
	if (mw.title.new((year - 3) .. " in sports")) then
		below = "[[" .. (year - 3) .. " in sports|" .. (year - 3) .. "]] " .. below
	end
	if (mw.title.new((year - 4) .. " in sports")) then
		below = "[[" .. (year - 4) .. " in sports|←]] " .. below
	end
	if (mw.title.new((year + 1) .. " in sports")) then
		below = below .. " [[" .. (year + 1) .. " in sports|" .. (year + 1) .. "]]"
	end
	if (mw.title.new((year + 2) .. " in sports")) then
		below = below .. " [[" .. (year + 2) .. " in sports|" .. (year + 2) .. "]]"
	end
	if (mw.title.new((year + 3) .. " in sports")) then
		below = below .. " [[" .. (year + 3) .. " in sports|" .. (year + 3) .. "]]"
	end
	if (mw.title.new((year + 4) .. " in sports")) then
		below = below .. " [[" .. (year + 4) .. " in sports|→]]"
	end
	
	local passing = {
		name = "Year in sports",
		title = "[[" .. year .. " in sports]]",
		content1 = l,
		below = below
	}
	
	local currentTitle = mw.title.getCurrentTitle()
	
	return sidebar.sidebar(frame, passing)
end

return p