Modul:Numbered subpages

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-- This module implements {{numbered subpages}}.

local getArgs = require('Modul:Arguments').getArgs

p = {}

local function ifexist(page)
    if not page then return false end
    if mw.title.new(page).exists then return true end
    return false
end

function p.main(frame)
	local args = getArgs(frame)
	local maxk = tonumber(args.max or '50') or 50
	local mink = tonumber(args.min or '1') or 1
	local root = ''
	local missing = args.missing or (args.max and 'transclude' or 'skip')
	local res = ''
	local headertemplate = args.headertemplate or ''
	
	if missing ~= 'transclude' then
		root = frame:preprocess('{{FULLPAGENAME}}')
	end
	maxk = (maxk > (mink + 250)) and (mink + 250) or maxk
	for i=mink,maxk do
		if missing == 'transclude' then
			if headertemplate == '' then
				res = res .. frame:expandTemplate{title = 'subpage', args = { i } }
			else 
				res = res .. frame:expandTemplate{title = 'subpage', args = { i, headertemplate=headertemplate } }
			end
		else
			if ifexist(root .. '/' .. i) then
				if headertemplate == '' then
					res = res .. frame:expandTemplate{title = 'subpage', args = { i } }
				else 
					res = res .. frame:expandTemplate{title = 'subpage', args = { i, headertemplate=headertemplate } }
				end
			else
				if missing == 'link' then
					res = res .. '[[' .. root .. '/' .. i .. ']] '
				elseif missing == 'stop' then
					i = maxk + 1
				end
			end
		end
	end
	
	return res
end

return p