Module:Pagetype

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local dts = require('Module:User:Anomie/deepToString').deepToString -- for debugging

local yesno = require('Module:Yesno')
local nsDetect = require('Module:Namespace detect')._main

local p = {}

local pagetypes = {
	main                  = 'article',
	mediawiki             = 'interface page',
	help                  = 'help page',
	project               = 'project page',
	book                  = 'book',
	file                  = 'file',
	template              = 'template',
	category              = 'category',
	module                = 'module',
	portal                = 'portal',
	timedtext             = 'Timed Text page',
	['education program'] = 'education program page',
	talk                  = 'talk page'
}

local defaultNamespaces = {'main', 'file', 'template', 'category', 'module', 'book'}

local function getNamespacePagetype(namespace, v)
	local ret = yesno(v, v) -- Returns true/false for "yes", "no", etc., and returns v for other input.
	if ret and type(ret) ~= 'string' then
		ret = pagetypes[namespace]
	end
	return ret
end

function p._main(args)
	local nsArgs = {}
	-- Get the default values.
	for _, namespace in ipairs(defaultNamespaces) do
		nsArgs[namespace] = pagetypes[namespace]
	end
	-- Add custom values passed in from the arguments.
	for namespace in pairs(pagetypes) do
		local nsArg = getNamespacePagetype(namespace, args[namespace])
		if nsArg ~= nil then
			nsArgs[namespace] = nsArg
		end
	end
	-- If there is no talk value specified, use the corresponding subject namespace for talk pages.
	if not nsArgs.talk then
		nsArgs.subjectns = true
	end
	-- Add the fallback value.
	nsArgs.other = 'page'
	-- Allow custom page and namespace values.
	nsArgs.page = args.page
	nsArgs.demospace = args.demospace
	return nsDetect(nsArgs)
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 origArgs
	if frame == mw.getCurrentFrame() then
		origArgs = frame:getParent().args
		for k, v in pairs(frame.args) do
			origArgs = frame.args
			break
		end
	else
		origArgs = frame
	end
	-- Trim whitespace and remove blank arguments.
	local args = {}
	for k, v in pairs(origArgs) do
		if type(v) == 'string' then
			v = mw.text.trim(v)
		end
		if v ~= '' then
			args[k] = v
		end
	end
	return p._main(args)
end

return p