Module:Subject bar

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--require('strict')

local getArgs = require('Module:Arguments').getArgs
local yesNo = require('Module:Yesno')

-- Determine whether we're being called from a sandbox
local isSandbox = mw.getCurrentFrame():getTitle():find('sandbox', 1, true)
local sandbox = isSandbox and '/sandbox' or ''

local p = {}

local sisters = {'commons','species','voy','n','wikt','b','q','s','v','iw','iw1','iw2','d'}

local function findNumericArgs(key, args)
	local pattern = "^"..key.."_?(%d+)$"  -- pattern to match
	local values = {}
	for k, v in pairs(args) do  --- loop through all arguments
		local ord = tonumber(mw.ustring.match(k,pattern)) --- if "foo_?%d+", extract number
		if ord then
			values[ord] = v
		end
	end
	if args[key] ~= nil then
		values[1] = args[key]
	end
	local compressSparseArray = require('Module:TableTools').compressSparseArray
	values = compressSparseArray(values)  --- squeeze out gaps/nils in values, keep ordering
	return values
end

function p._main(args)
	local result = ""
		
	local hasPortal = false
	for key, _ in pairs(args) do
		if mw.ustring.sub(key,1,6) == 'portal' or tonumber(key) then
			hasPortal = true
			break
		end
	end
	
	local hasSister = yesNo(args.auto,true) or yesNo(args.author,true) or yesNo(args.cookbook,true)
	for _, sister in ipairs(sisters) do
		if hasSister then
			break
		end
		if yesNo(args[sister],true) or yesNo(args[sister..'-search'],true) then
			hasSister = true
		end
	end

	if hasPortal then
		local portalList = findNumericArgs("portal",args)
		for _, positional in ipairs(args) do
			table.insert(portalList, positional)
		end
		local portalBar = require('Module:Portal bar'..sandbox)._main
		result = result..portalBar(portalList, {tracking=args.tracking, qid=args.qid})
	end
	
	if hasSister then
		local sisterArgs = {auto=1, bar=1, trackSingle=not hasPortal}
		sisterArgs[1] = args.search
		for _, k in ipairs({'author','commonscat','cookbook','display','tracking','qid'}) do
			sisterArgs[k] = args[k]
		end
    	for _, t in ipairs(sisters) do
    		sisterArgs[t] = args[t..'-search'] or args[t]
    	end
    	local sisterBar = require('Module:Sister project links'..sandbox)._main
		result = result..sisterBar(sisterArgs)
	end
	
	return result
end

function p.main(frame)
    -- If called via #invoke, use the args passed into the invoking template,
    -- or the args passed to #invoke if any exist. Otherwise assume args are
    -- being passed directly in from the debug console or from another Lua module.
    local args = getArgs(frame)
    return p._main(args)
end

return p