Module:AVBrandList

Documentation for this module may be created at Module:AVBrandList/doc

-- Module:AVBrandList
-- Dynamically generates a list of AV device brand buttons by querying
-- all unique brands from the AV devices category.

local p = {}

local function trim(s)
	if s == nil then return nil end
	s = tostring(s)
	s = s:gsub('^%s+', ''):gsub('%s+$', '')
	if s == '' then return nil end
	return s
end

function p.list(frame)
	-- Query all AV devices and get their brands
	-- Use high limit and searchlabel= to suppress "further results"
	local queryWikitext =
		'{{#ask:\n' ..
		' [[Category:AV devices]]\n' ..
		' |?Has brand\n' ..
		' |format=broadtable\n' ..
		' |headers=hide\n' ..
		' |link=none\n' ..
		' |mainlabel=-\n' ..
		' |limit=5000\n' ..
		' |searchlabel=\n' ..
		'}}'
	
	local queryResult = frame:preprocess(queryWikitext)
	
	-- Extract unique brands from the result
	local brandsSet = {}
	local brandsList = {}
	
	if queryResult then
		for cellContent in queryResult:gmatch('<td[^>]*>(.-)</td>') do
			local brand = trim(cellContent:gsub('<[^>]+>', ''))
			if brand and brand ~= '' and not brandsSet[brand] then
				brandsSet[brand] = true
				table.insert(brandsList, brand)
			end
		end
	end
	
	-- Sort alphabetically
	table.sort(brandsList)
	
	if #brandsList == 0 then
		return '<p><em>No AV device brands found.</em></p>'
	end
	
	-- Build the output: render each brand using Template:AV brand entry
	local output = {}
	for _, brand in ipairs(brandsList) do
		local templateCall = '{{AV brand entry|brand=' .. brand .. '}}'
		table.insert(output, frame:preprocess(templateCall))
	end
	
	return table.concat(output, '\n')
end

return p