Модул:documentation

local export = {}

-- it is either here, or in [[Module:ugly hacks]], and it is not in ugly hacks.
function export.CONTENTMODEL()
	return mw.title.getCurrentTitle().contentModel
end

local skins = {
	["common"     ] = "";
	["vector"     ] = "Vector";
	["monobook"   ] = "Monobook";
	["cologneblue"] = "Cologne Blue";
	["modern"     ] = "Modern";
}

local Array = require "Module:array"
local p = {}

----------------------------------------------------------------------------
-- Argument processing
----------------------------------------------------------------------------

local function makeInvokeFunc(funcName)
	return function (frame)
		local args = getArgs(frame, {
			valueFunc = function (key, value)
				if type(value) == 'string' then
					value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
					if key == 'heading' or value ~= '' then
						return value
					else
						return nil
					end
				else
					return value
				end
			end
		})
		return p[funcName](args)
	end
end

----------------------------------------------------------------------------
-- Main function
----------------------------------------------------------------------------

p.main = makeInvokeFunc('_main')

function p._main(args)
	--[[
	-- This function defines logic flow for the module.
	-- @args - table of arguments passed by the user
	-- 
	-- Messages:
	-- 'main-div-id' --> 'template-documentation'
	-- 'main-div-classes' --> 'template-documentation iezoomfix'
	--]]
	local env = p.getEnvironment(args)
	local root = mw.html.create()
	root
		:wikitext(p.protectionTemplate(env))
		:wikitext(p.sandboxNotice(args, env))
		 -- This div tag is from {{documentation/start box}}, but moving it here
		 -- so that we don't have to worry about unclosed tags.
		:tag('div')
			:attr('id', message('main-div-id'))
			:addClass(message('main-div-classes'))
			:newline()
			:wikitext(p._startBox(args, env))
			:wikitext(p._content(args, env))
			:tag('div')
				:css('clear', 'both') -- So right or left floating items don't stick out of the doc box.
				:newline()
				:done()
			:done()
		:wikitext(p._endBox(args, env))
		:wikitext(p.addTrackingCategories(env))
	return tostring(root)
end

----------------------------------------------------------------------------
-- Environment settings
----------------------------------------------------------------------------

function p.getEnvironment(args)
	--[[
	-- Returns a table with information about the environment, including title objects and other namespace- or
	-- path-related data.
	-- @args - table of arguments passed by the user
	--
	-- Title objects include:
	-- env.title - the page we are making documentation for (usually the current title)
	-- env.templateTitle - the template (or module, file, etc.)
	-- env.docTitle - the /doc subpage.
	-- env.sandboxTitle - the /sandbox subpage.
	-- env.testcasesTitle - the /testcases subpage.
	-- env.printTitle - the print version of the template, located at the /Print subpage.
	--
	-- Data includes:
	-- env.protectionLevels - the protection levels table of the title object.
	-- env.subjectSpace - the number of the title's subject namespace.
	-- env.docSpace - the number of the namespace the title puts its documentation in.
	-- env.docpageBase - the text of the base page of the /doc, /sandbox and /testcases pages, with namespace.
	-- env.compareUrl - URL of the Special:ComparePages page comparing the sandbox with the template.
	-- 
	-- All table lookups are passed through pcall so that errors are caught. If an error occurs, the value
	-- returned will be nil.
	--]]
	
	local env, envFuncs = {}, {}

	-- Set up the metatable. If triggered we call the corresponding function in the envFuncs table. The value
	-- returned by that function is memoized in the env table so that we don't call any of the functions
	-- more than once. (Nils won't be memoized.)
	setmetatable(env, {
		__index = function (t, key)
			local envFunc = envFuncs[key]
			if envFunc then
				local success, val = pcall(envFunc)
				if success then
					env[key] = val -- Memoise the value.
					return val
				end
			end
			return nil
		end
	})	

	function envFuncs.title()
		-- The title object for the current page, or a test page passed with args.page.
		local title
		local titleArg = args.page
		if titleArg then
			title = mw.title.new(titleArg)
		else
			title = mw.title.getCurrentTitle()
		end
		return title
	end

	function envFuncs.templateTitle()
		--[[
		-- The template (or module, etc.) title object.
		-- Messages:
		-- 'sandbox-subpage' --> 'sandbox'
		-- 'testcases-subpage' --> 'testcases'
		--]]
		local subjectSpace = env.subjectSpace
		local title = env.title
		local subpage = title.subpageText
		if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
			return mw.title.makeTitle(subjectSpace, title.baseText)
		else
			return mw.title.makeTitle(subjectSpace, title.text)
		end
	end

	function envFuncs.docTitle()
		--[[
		-- Title object of the /doc subpage.
		-- Messages:
		-- 'doc-subpage' --> 'doc'
		--]]
		local title = env.title
		local docname = args[1] -- User-specified doc page.
		local docpage
		if docname then
			docpage = docname
		else
			docpage = env.docpageBase .. '/' .. message('doc-subpage')
		end
		return mw.title.new(docpage)
	end
	
	function envFuncs.sandboxTitle()
		--[[
		-- Title object for the /sandbox subpage.
		-- Messages:
		-- 'sandbox-subpage' --> 'sandbox'
		--]]
		return mw.title.new(env.docpageBase .. '/' .. message('sandbox-subpage'))
	end
	
	function envFuncs.testcasesTitle()
		--[[
		-- Title object for the /testcases subpage.
		-- Messages:
		-- 'testcases-subpage' --> 'testcases'
		--]]
		return mw.title.new(env.docpageBase .. '/' .. message('testcases-subpage'))
	end
	
	function envFuncs.printTitle()
		--[[
		-- Title object for the /Print subpage.
		-- Messages:
		-- 'print-subpage' --> 'Print'
		--]]
		return env.templateTitle:subPageTitle(message('print-subpage'))
	end

	function envFuncs.protectionLevels()
		-- The protection levels table of the title object.
		return env.title.protectionLevels
	end

	function envFuncs.subjectSpace()
		-- The subject namespace number.
		return mw.site.namespaces[env.title.namespace].subject.id
	end

	function envFuncs.docSpace()
		-- The documentation namespace number. For most namespaces this is the same as the
		-- subject namespace. However, pages in the Article, File, MediaWiki or Category
		-- namespaces must have their /doc, /sandbox and /testcases pages in talk space.
		local subjectSpace = env.subjectSpace
		if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
			return subjectSpace + 1
		else
			return subjectSpace
		end
	end

	function envFuncs.docpageBase()
		-- The base page of the /doc, /sandbox, and /testcases subpages.
		-- For some namespaces this is the talk page, rather than the template page.
		local templateTitle = env.templateTitle
		local docSpace = env.docSpace
		local docSpaceText = mw.site.namespaces[docSpace].name
		-- Assemble the link. docSpace is never the main namespace, so we can hardcode the colon.
		return docSpaceText .. ':' .. templateTitle.text
	end
	
	function envFuncs.compareUrl()
		-- Diff link between the sandbox and the main template using [[Special:ComparePages]].
		local templateTitle = env.templateTitle
		local sandboxTitle = env.sandboxTitle
		if templateTitle.exists and sandboxTitle.exists then
			local compareUrl = mw.uri.fullUrl(
				'Special:ComparePages',
				{page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
			)
			return tostring(compareUrl)
		else
			return nil
		end
	end		

	return env
end	

----------------------------------------------------------------------------
-- Auxiliary templates
----------------------------------------------------------------------------

function p.sandboxNotice(args, env)
	--[=[
	-- Generates a sandbox notice for display above sandbox pages.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'sandbox-notice-image' --> '[[Image:Sandbox.svg|50px|alt=|link=]]'
	-- 'sandbox-notice-blurb' --> 'This is the $1 for $2.'
	-- 'sandbox-notice-diff-blurb' --> 'This is the $1 for $2 ($3).'
	-- 'sandbox-notice-pagetype-template' --> '[[Wikipedia:Template test cases|template sandbox]] page'
	-- 'sandbox-notice-pagetype-module' --> '[[Wikipedia:Template test cases|module sandbox]] page'
	-- 'sandbox-notice-pagetype-other' --> 'sandbox page'
	-- 'sandbox-notice-compare-link-display' --> 'diff'
	-- 'sandbox-notice-testcases-blurb' --> 'See also the companion subpage for $1.'
	-- 'sandbox-notice-testcases-link-display' --> 'test cases'
	-- 'sandbox-category' --> 'Template sandboxes'
	--]=]
	local title = env.title
	local sandboxTitle = env.sandboxTitle
	local templateTitle = env.templateTitle
	local subjectSpace = env.subjectSpace
	if not (subjectSpace and title and sandboxTitle and templateTitle and mw.title.equals(title, sandboxTitle)) then
		return nil
	end
	-- Build the table of arguments to pass to {{ombox}}. We need just two fields, "image" and "text".
	local omargs = {}
	omargs.image = message('sandbox-notice-image')
	-- Get the text. We start with the opening blurb, which is something like
	-- "This is the template sandbox for [[Template:Foo]] (diff)."
	local text = ''
	local pagetype
	if subjectSpace == 10 then
		pagetype = message('sandbox-notice-pagetype-template')
	elseif subjectSpace == 828 then
		pagetype = message('sandbox-notice-pagetype-module')
	else
		pagetype = message('sandbox-notice-pagetype-other')
	end
	local templateLink = makeWikilink(templateTitle.prefixedText)
	local compareUrl = env.compareUrl
	if compareUrl then
		local compareDisplay = message('sandbox-notice-compare-link-display')
		local compareLink = makeUrlLink(compareUrl, compareDisplay)
		text = text .. message('sandbox-notice-diff-blurb', {pagetype, templateLink, compareLink})
	else
		text = text .. message('sandbox-notice-blurb', {pagetype, templateLink})
	end
	-- Get the test cases page blurb if the page exists. This is something like
	-- "See also the companion subpage for [[Template:Foo/testcases|test cases]]."
	local testcasesTitle = env.testcasesTitle
	if testcasesTitle and testcasesTitle.exists then
		if testcasesTitle.namespace == mw.site.namespaces.Module.id then
			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
			local testcasesRunLinkDisplay = message('sandbox-notice-testcases-run-link-display')
			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
			local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
			text = text .. '<br />' .. message('sandbox-notice-testcases-run-blurb', {testcasesLink, testcasesRunLink})
		else
			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
			text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
		end
	end
	-- Add the sandbox to the sandbox category.
	text = text .. makeCategoryLink(message('sandbox-category'))
	omargs.text = text
	local ret = '<div style="clear: both;"></div>'
	ret = ret .. messageBox.main('ombox', omargs)
	return ret
end

function p.protectionTemplate(env)
	-- Generates the padlock icon in the top right.
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- Messages:
	-- 'protection-template' --> 'pp-template'
	-- 'protection-template-args' --> {docusage = 'yes'}
	local protectionLevels, mProtectionBanner
	local title = env.title
	protectionLevels = env.protectionLevels
	if not protectionLevels then
		return nil
	end
	local editProt = protectionLevels.edit and protectionLevels.edit[1]
	local moveProt = protectionLevels.move and protectionLevels.move[1]
	if editProt then
		-- The page is edit-protected.
		mProtectionBanner = require('Модул:protection banner')
		local reason = message('protection-reason-edit')
		return mProtectionBanner._main{reason, small = true}
	elseif moveProt and moveProt ~= 'autoconfirmed' then
		-- The page is move-protected but not edit-protected. Exclude move
		-- protection with the level "autoconfirmed", as this is equivalent to
		-- no move protection at all.
		mProtectionBanner = require('Модул:protection banner')
		return mProtectionBanner._main{action = 'move', small = true}
	else
		return nil
	end
end

----------------------------------------------------------------------------
-- Start box
----------------------------------------------------------------------------

p.startBox = makeInvokeFunc('_startBox')

function p._startBox(args, env)
	--[[
	-- This function generates the start box.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- The actual work is done by p.makeStartBoxLinksData and p.renderStartBoxLinks which make
	-- the [view] [edit] [history] [purge] links, and by p.makeStartBoxData and p.renderStartBox
	-- which generate the box HTML.
	--]]
	env = env or p.getEnvironment(args)
	local links
	local content = args['садржај']
	if not content then
		-- No need to include the links if the documentation is on the template page itself.
		local linksData = p.makeStartBoxLinksData(args, env)
		if linksData then
			links = p.renderStartBoxLinks(linksData)
		end
	end
	-- Generate the start box html.
	local data = p.makeStartBoxData(args, env, links)
	if data then
		return p.renderStartBox(data)
	else
		-- User specified no heading.
		return nil
	end
end

function p.makeStartBoxLinksData(args, env)
	--[[
	-- Does initial processing of data to make the [view] [edit] [history] [purge] links.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'view-link-display' --> 'view'
	-- 'edit-link-display' --> 'edit'
	-- 'history-link-display' --> 'history'
	-- 'purge-link-display' --> 'purge'
	-- 'file-docpage-preload' --> 'Template:Documentation/preload-filespace'
	-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
	-- 'docpage-preload' --> 'Template:Documentation/preload'
	-- 'create-link-display' --> 'create'
	--]]
	local subjectSpace = env.subjectSpace
	local title = env.title
	local docTitle = env.docTitle
	if not title or not docTitle then
		return nil
	end
	if docTitle.isRedirect then 
		docTitle = docTitle.redirectTarget
	end

	local data = {}
	data.title = title
	data.docTitle = docTitle
	-- View, display, edit, and purge links if /doc exists.
	data.viewLinkDisplay = message('view-link-display')
	data.editLinkDisplay = message('edit-link-display')
	data.historyLinkDisplay = message('history-link-display')
	data.purgeLinkDisplay = message('purge-link-display')
	-- Create link if /doc doesn't exist.
	local preload = args.preload
	if not preload then
		if subjectSpace == 6 then -- File namespace
			preload = message('file-docpage-preload')
		elseif subjectSpace == 828 then -- Module namespace
			preload = message('module-preload')
		else
			preload = message('docpage-preload')
		end
	end
	data.preload = preload
	data.createLinkDisplay = message('create-link-display')
	return data
end

function p.renderStartBoxLinks(data)
	--[[
	-- Generates the [view][edit][history][purge] or [create] links from the data table.
	-- @data - a table of data generated by p.makeStartBoxLinksData
	--]]
	
	local function escapeBrackets(s)
		-- Escapes square brackets with HTML entities.
		s = s:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
		s = s:gsub('%]', '&#93;')
		return s
	end

	local ret
	local docTitle = data.docTitle
	local title = data.title
	if docTitle.exists then
		local viewLink = makeWikilink(docTitle.prefixedText, data.viewLinkDisplay)
		local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, data.editLinkDisplay)
		local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, data.historyLinkDisplay)
		local purgeLink = makeUrlLink(title:fullUrl{action = 'purge'}, data.purgeLinkDisplay)
		ret = '[%s] [%s] [%s] [%s]'
		ret = escapeBrackets(ret)
		ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
	else
		local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
		ret = '[%s]'
		ret = escapeBrackets(ret)
		ret = mw.ustring.format(ret, createLink)
	end
	return ret
end

function p.makeStartBoxData(args, env, links)
	--[=[
	-- Does initial processing of data to pass to the start-box render function, p.renderStartBox.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- @links - a string containing the [view][edit][history][purge] links - could be nil if there's an error.
	--
	-- Messages:
	-- 'documentation-icon-wikitext' --> '[[File:Test Template Info-Icon - Version (2).svg|50px|link=|alt=]]'
	-- 'template-namespace-heading' --> 'Template documentation'
	-- 'module-namespace-heading' --> 'Module documentation'
	-- 'file-namespace-heading' --> 'Summary'
	-- 'other-namespaces-heading' --> 'Documentation'
	-- 'start-box-linkclasses' --> 'mw-editsection-like plainlinks'
	-- 'start-box-link-id' --> 'doc_editlinks'
	-- 'testcases-create-link-display' --> 'create'
	--]=]
	local subjectSpace = env.subjectSpace
	if not subjectSpace then
		-- Default to an "other namespaces" namespace, so that we get at least some output
		-- if an error occurs.
		subjectSpace = 2
	end
	local data = {}
	
	-- Heading
	local heading = args.heading -- Blank values are not removed.
	if heading == '' then
		-- Don't display the start box if the heading arg is defined but blank.
		return nil
	end
	if heading then
		data.heading = heading
	elseif subjectSpace == 10 then -- Template namespace
		data.heading = message('documentation-icon-wikitext') .. ' ' .. message('template-namespace-heading')
	elseif subjectSpace == 828 then -- Module namespace
		data.heading = message('documentation-icon-wikitext') .. ' ' .. message('module-namespace-heading')
	elseif subjectSpace == 6 then -- File namespace
		data.heading = message('file-namespace-heading')
	else
		data.heading = message('other-namespaces-heading')
	end
	
	-- Heading CSS
	local headingStyle = args['heading-style']
	if headingStyle then
		data.headingStyleText = headingStyle
	elseif subjectSpace == 10 then
		-- We are in the template or template talk namespaces.
		data.headingFontWeight = 'bold'
		data.headingFontSize = '125%'
	else
		data.headingFontSize = '150%'
	end
	
	-- Data for the [view][edit][history][purge] or [create] links.
	if links then
		data.linksClass = message('start-box-linkclasses')
		data.linksId = message('start-box-link-id')
		data.links = links
	end
	
	return data
end

function p.renderStartBox(data)
	-- Renders the start box html.
	-- @data - a table of data generated by p.makeStartBoxData.
	local sbox = mw.html.create('div')
	sbox
		:css('padding-bottom', '3px')
		:css('border-bottom', '1px solid #aaa')
		:css('margin-bottom', '1ex')
		:newline()
		:tag('span')
			:cssText(data.headingStyleText)
			:css('font-weight', data.headingFontWeight)
			:css('font-size', data.headingFontSize)
			:wikitext(data.heading)
	local links = data.links
	if links then
		sbox:tag('span')
			:addClass(data.linksClass)
			:attr('id', data.linksId)
			:wikitext(links)
	end
	return tostring(sbox)
end

----------------------------------------------------------------------------
-- Documentation content
----------------------------------------------------------------------------

p.content = makeInvokeFunc('_content')

function p._content(args, env)
	-- Displays the documentation contents
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	env = env or p.getEnvironment(args)
	local docTitle = env.docTitle
	local content = args['садржај']
	if not content and docTitle and docTitle.exists then
		content = args._content or mw.getCurrentFrame():expandTemplate{title = docTitle.prefixedText}
	end
	-- The line breaks below are necessary so that "=== Headings ===" at the start and end
	-- of docs are interpreted correctly.
	return '\n' .. (content or '') .. '\n' 
end

p.contentTitle = makeInvokeFunc('_contentTitle')

function p._contentTitle(args, env)
	env = env or p.getEnvironment(args)
	local docTitle = env.docTitle
	if not args['садржај'] and docTitle and docTitle.exists then
		return docTitle.prefixedText
	else
		return ''
	end
end

----------------------------------------------------------------------------
-- End box
----------------------------------------------------------------------------

p.endBox = makeInvokeFunc('_endBox')

function p._endBox(args, env)
	--[=[
	-- This function generates the end box (also known as the link box).
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'fmbox-id' --> 'documentation-meta-data'
	-- 'fmbox-style' --> 'background-color: #ecfcf4'
	-- 'fmbox-textstyle' --> 'font-style: italic'
	-- 
	-- The HTML is generated by the {{fmbox}} template, courtesy of [[Module:Message box]].
	--]=]
	
	-- Get environment data.
	env = env or p.getEnvironment(args)
	local subjectSpace = env.subjectSpace
	local docTitle = env.docTitle
	if not subjectSpace or not docTitle then
		return nil
	end
		
	-- Check whether we should output the end box at all. Add the end
	-- box by default if the documentation exists or if we are in the
	-- user, module or template namespaces.
	local linkBox = args['link box']
	if linkBox == 'off'
		or not (
			docTitle.exists
			or subjectSpace == 2
			or subjectSpace == 828
			or subjectSpace == 10
		)
	then
		return nil
	end

	-- Assemble the arguments for {{fmbox}}.
	local fmargs = {}
	fmargs.id = message('fmbox-id') -- Sets 'documentation-meta-data'
	fmargs.image = 'none'
	fmargs.style = message('fmbox-style') -- Sets 'background-color: #ecfcf4'
	fmargs.textstyle = message('fmbox-textstyle') -- 'font-style: italic;'

	-- Assemble the fmbox text field.
	local text = ''
	if linkBox then
		text = text .. linkBox
	else
		text = text .. (p.makeDocPageBlurb(args, env) or '') -- "This documentation is transcluded from [[Foo]]." 
		if subjectSpace == 2 or subjectSpace == 10 or subjectSpace == 828 then
			-- We are in the user, template or module namespaces.
			-- Add sandbox and testcases links.
			-- "Editors can experiment in this template's sandbox and testcases pages."
			text = text .. (p.makeExperimentBlurb(args, env) or '')
			text = text .. '<br />'
			if not args['садржај'] and not args[1] then
				-- "Please add categories to the /doc subpage."
				-- Don't show this message with inline docs or with an explicitly specified doc page,
				-- as then it is unclear where to add the categories.
				text = text .. (p.makeCategoriesBlurb(args, env) or '')
			end
			text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '') --"Subpages of this template"
			local printBlurb = p.makePrintBlurb(args, env) -- Two-line blurb about print versions of templates.
			if printBlurb then
				text = text .. '<br />' .. printBlurb
			end
		end
	end
	fmargs.text = text

	return messageBox.main('fmbox', fmargs)
end

local function track(page)
	require("Module:debug/track")("documentation/" .. page)
	return true
end

local function compare_pages(page1, page2, text)
	return "[" .. tostring(
		mw.uri.fullUrl("Special:ComparePages", { page1 = page1, page2 = page2 }))
		.. " " .. text .. "]"
end

local function page_exists(title)
	local success, title_obj = pcall(mw.title.new, title)
	return success and title_obj.exists
end

-- Avoid transcluding [[Module:languages/cache]] everywhere.
local lang_cache = setmetatable({}, { __index = function (self, k)
	return require "Module:languages/cache"[k]
end })

local function zh_link(word)
	return require("Module:links").full_link{
		lang = lang_cache.zh,
		term = word
	}
end

local function make_languages_data_documentation(title, cats, division)
	local doc_template, module_cat
	if division:find("/extra$") then
		division = division:gsub("/extra$", "")
		doc_template = "language extradata documentation"
		module_cat = "Language extra data modules"
	else
		doc_template = "language data documentation"
		module_cat = "Language data modules"
	end
	local sort_key
	if division == "exceptional" then
		sort_key = "x"
	else
		sort_key = division:gsub("/", "")
	end
	cats:insert(module_cat .. "|" .. sort_key)
	return {
		title = doc_template
	}
end

local function make_Unicode_data_documentation(title, cats)
	local subpage, first_three_of_code_point
		= title.fullText:match("^Module:Unicode data/([^/]+)/(%x%x%x)$")
	if subpage == "names" or subpage == "images" then
		local low, high =
			tonumber(first_three_of_code_point .. "000", 16),
			tonumber(first_three_of_code_point .. "FFF", 16)
		return string.format(
			"Овај податковни модул садржи: %s //" ..
			"[[Appendix:Unicode|Unicode]] code points within the range U+%04X to U+%04X.",
			subpage == "images" and "titles of images" or "names",
			low, high)
	end
end

local function insert_lang_data_module_cats(cats, langcode, overall_data_module_cat)
	local lang = lang_cache[langcode]
	if lang then
		local langname = lang:getCanonicalName()
		cats:insert(overall_data_module_cat .. "|" .. langname)
		cats:insert(langname .. " modules")
		cats:insert(langname .. " data modules")
		return lang, langname
	end
end

--[=[
This provides categories and documentation for various data modules, so that [[Category:Uncategorized modules]] isn't
unnecessarily cluttered. It is a list of tables, each of which have the following possible fields:

`regex` (required): A Lua pattern to match the module's title. If it matches, the data in this entry will be used.
	Any captures in the pattern can by referenced in the `cat` field using %1 for the first capture, %2 for the
	second, etc. (often used for creating the sortkey for the category). In addition, the captures are passed to the
	`process` function as the third and subsequent parameters.

`process` (optional): This may be a function or a string. If it is a function, it is called as follows:
	   `process(TITLE, CATS, CAPTURE1, CAPTURE2, ...)`
	where:
	   * TITLE is a title object describing the module's title; see
	     [https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Title_objects].
	   * CATS is an array object (see [[Module:array]]) of categories that the module will be added to.
	   * CAPTURE1, CAPTURE2, ... contain any captures in the `regex` field.
	The return value of `process` should either be a string (which will be used as the module's documentation), or a
	table specifying the name of a template to expand to get the documentation, along with the arguments to that
	template. In the latter format, the template name (bare, without the "Template:" prefix) should be in the `title`
	field, and any arguments should be in `args; in this case, the template name will be listed above the generated
	documentation as the source of the documentation, along with an edit button to edit the template's contents.
	If, however, the return value of the `process` function is a string, any template invocations will be expanded
	using frame:preprocess(), and [[Module:documentation]] will be listed as the source of the documentation.

	If `process` itself is a string rather than a function, it should name a submodule under
	[[Module:documentation/functions/]] which returns a function, of the same type as described above. This submodule
	will be specified as the source of the documentation (unless it returns a table naming a template to expand to get
	the documentation, as described above).

	If `process` is omitted entirely, the module will have no documentation.

`cat` (optional): A string naming the category into which the module should be placed, or a list of such strings.
	Captures specified in `regex` may be referenced in this string using %1 for the first capture, %2 for the second,
	etc. It is also possible to add categories in the `process` function by inserting them into the passed-in CATS
	array (the second parameter).
]=]

local module_regex = {
	{
		regex = "^Module:languages/data/(3/./extra)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/data/(3/.)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/data/(2/extra)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/data/(2)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/data/(exceptional/extra)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/data/(exceptional)$",
		process = make_languages_data_documentation,
	},
	{
		regex = "^Module:languages/.+$",
		cat = "Language and script modules",
	},
	{
		regex = "^Module:scripts/.+$",
		cat = "Language and script modules",
	},
	{
		regex = "^Module:data tables/data..?.?.?$",
		cat = "Reference module sharded data tables",
	},
	{
		regex = "^Module:zh/data/dial%-pron/.+$",
		cat = "Chinese dialectal pronunciation data modules",
		process = "zh dial or syn",
	},
	{
		regex = "^Module:zh/data/dial%-syn/.+$",
		cat = "Chinese dialect synonyms data modules",
		process = "zh dial or syn",
	},
	{
		regex = "^Module:zh/data/glyph%-data/.+$",
		cat = "Chinese historical character forms data modules",
		process = function(title, cats)
			local character = title.fullText:match("^Module:zh/data/glyph%-data/(.+)")
			if character then
				return ("Овај модул садржи податке о историјским формама кинескога слова: „%s”.")
					:format(zh_link(character))
			end
		end,
	},
	{
		regex = "^Module:zh/data/ltc%-pron/(.+)$",
		cat = "Middle Chinese pronunciation data modules|%1",
		process = "zh data",
	},
	{
		regex = "^Module:zh/data/och%-pron%-BS/(.+)$",
		cat = "Old Chinese (Baxter-Sagart) pronunciation data modules|%1",
		process = "zh data",
	},
	{
		regex = "^Module:zh/data/och%-pron%-ZS/(.+)$",
		cat = "Old Chinese (Zhengzhang) pronunciation data modules|%1",
		process = "zh data",
	},
	{
		-- capture rest of zh/data submodules
		regex = "^Module:zh/data/(.+)$",
		cat = "Chinese data modules|%1",
	},
	{
		regex = "^Module:mul/guoxue%-data/cjk%-?(.*)$",
		process = "guoxue-data",
	},
	{
		regex = "^Module:Unicode data/(.+)$",
		cat = "Unicode data modules|%1",
		process = make_Unicode_data_documentation,
	},
	{
		regex = "^Module:number list/data/(.+)$",
		process = function(title, cats, lang_code)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Number data modules")
			if lang then
				return ("This module contains data on various types of numbers in %s.\n%s")
					:format(lang:makeCategoryLink(), require("Module:number list/show").table() or "")
			end
		end,
	},
	{
		regex = "^Module:accel/(.+)$",
		process = function(title, cats)
			local lang_code = title.subpageText
			local lang = lang_cache[lang_code]
			if lang then
				cats:insert(lang:getCanonicalName() .. " modules|accel")
				cats:insert(("Accel submodules|%s"):format(lang:getCanonicalName()))
				return ("This module contains new entry creation rules for %s; see [[WT:ACCEL]] for an overview, and [[Module:accel]] for information on creating new rules.")
					:format(lang:makeCategoryLink())
			end
		end,
	},
	{
		regex = "^Module:inc%-ash/dial/data/(.+)$",
		cat = "Ashokan Prakrit modules|%1",
		process = function(title, cats)
			local word = title.fullText:match("^Module:inc%-ash/dial/data/(.+)$")
			if word then
				local lang = lang_cache["inc-ash"]
				return ("This module contains data on the pronunciation of %s in dialects of %s.")
					:format(require("Module:links").full_link({ term = word, lang = lang }, "term"),
						lang:makeCategoryLink())
			end
		end,
	},
	{
		regex = "^.+%-translit$",
		process = "translit",
	},
	{
		regex = "^Module:form of/lang%-data/(.+)$",
		process = function(title, cats, lang_code)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Language-specific form-of modules")
			if lang then
				-- FIXME, display more info.
				return "This module contains language-specific form-of data (tags, shortcuts, base lemma params. etc.) for " ..
					langname .. ".\n\n'''NOTE:''' If you add a new language-specific module, you must add the language code to the " ..
					"list at the top of [[Module:form of]] in order for the module to be recognized."
			end
		end
	},
	{
		regex = "^Module:labels/data/lang/(.+)$",
		process = function(title, cats, lang_code)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Language-specific label data modules")
			if lang then
				return {
					title = "label language-specific data documentation",
					args = { [1] = lang_code },
				}
			end
		end
	},
	{
		regex = "^Module:category tree/poscatboiler/data/lang%-specific/(.+)$",
		process = function(title, cats, lang_code)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Category tree data modules/poscatboiler")
			if lang then
				return "This module handles generating the descriptions and categorization for " .. langname .. " category pages "
					.. "of the format \"" .. langname .. " LABEL\" where LABEL can be any text. Examples are "
					.. "[[:Category:Bulgarian conjugation 2.1 verbs]] and [[:Category:Russian velar-stem neuter-form nouns]]. "
					.. "This module is part of the poscatboiler system, which is a general framework for generating the "
					.. "descriptions and categorization of category pages.\n\n"
					.. "For more information, see [[Module:category tree/poscatboiler/data/lang-specific/documentation]].\n\n"
					.. "'''NOTE:''' If you add a new language-specific module, you must add the language code to the "
					.. "list at the top of [[Module:category tree/poscatboiler/data/lang-specific]] in order for the module to be "
					.. "recognized."
			end
		end
	},
	{
		regex = "^Module:category tree/poscatboiler/data/(.+)$",
		process = function(title, cats, submodule)
			cats:insert("Category tree data modules/poscatboiler| ")
			return {
				title = "poscatboiler data submodule documentation"
			}
		end
	},
	{
		regex = "^Module:category tree/topic cat/data/(.+)$",
		process = function(title, cats, submodule)
			cats:insert("Category tree data modules/topic cat| ")
			return {
				title = "topic cat data submodule documentation"
			}
		end
	},
	{
		regex = "^Module:ja/data/(.+)$",
		cat = "Japanese data modules|%1",
	},
	{
		regex = "^Module:fi%-dialects/data/feature/Kettunen1940 ([0-9]+)$",
		cat = "Finnish dialectal data atlas modules|%1",
		process = function(title, cats, shard)
			return "This module contains shard " .. shard .. " of the online version of Lauri Kettunen's 1940 work " ..
				"''Suomen murteet III A. Murrekartasto'' (\"Finnish dialects III A: Dialect atlas\"). " ..
				"It was imported and converted from urn:nbn:fi:csc-kata20151130145346403821, published by the " ..
				"''Kotimaisten kielten keskus'' under the CC BY 4.0 license."
		end
	},
	{
		regex = "^Module:Swadesh/data/([a-z-]+)$",
		process = function(title, cats, lang_code)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Swadesh modules")
			if lang then
				return "This module contains the [[Swadesh list]] of basic vocabulary in " .. langname .. "."
			end
		end
	},
	{
		regex = "^Module:Swadesh/data/([a-z-]+)/([^/]*)$",
		process = function(title, cats, lang_code, variety)
			local lang, langname = insert_lang_data_module_cats(cats, lang_code, "Swadesh modules")
			if lang then
				local prefix = "This module contains the [[Swadesh list]] of basic vocabulary in the "
				local etym_lang = require("Module:languages").getByCode(variety, nil, "allow etym")
				if etym_lang then
					return ("%s %s variety of %s."):format(prefix, etym_lang:getCanonicalName(), langname)
				end
				local script = require("Module:scripts").getByCode(variety)
				if script then
					return ("%s %s %s script."):format(prefix, langname, script:getCanonicalName())
				end
				return ("%s %s variety of %s."):format(prefix, variety, langname)
			end
		end
	},
	{
		regex = "^Module:typing%-aids",
		process = function(title, cats)
			local data_suffix = title.fullText:match("^Module:typing%-aids/data/(.+)$")
			local sortkey
			if data_suffix then
				if data_suffix:find "^[%l-]+$" then
					local lang = require("Module:languages").getByCode(data_suffix)
					if lang then
						sortkey = lang:getCanonicalName()
						cats:insert(sortkey .. " data modules")
					end
				elseif data_suffix:find "^%u%l%l%l$" then
					local script = require("Module:scripts").getByCode(data_suffix)
					if script then
						sortkey = script:getCanonicalName()
						cats:insert(script:getCategoryName())
					end
				end
				cats:insert("Character insertion data modules|" .. (sortkey or data_suffix))
			end
		end,
	},
	{
		regex = "^Module:R:([a-z%-]+):(.+)$",
		process = function(title, cats, lang_code, refname)
			local lang = lang_cache[lang_code]
			if lang then
				cats:insert(lang:getCanonicalName() .. " modules|" .. refname)
				cats:insert(("Reference modules|%s"):format(lang:getCanonicalName()))
				return "This module implements the reference template {{temp|R:" ..	lang_code .. ":" .. refname .. "}}."
			end
		end,
	},
	{
		regex = "^Module:Quotations/([a-z-]+)/?(.*)",
		process = "Quotation",
	},
	{
		regex = "^Module:affix/lang%-data/([a-z-]+)",
		process = "affix lang-data",
	},
	{
		regex = "^Module:dialect synonyms/([a-z-]+)$",
		process = function(title, cats, lang_code)
			local lang = lang_cache[lang_code]
			if lang then
				local langname = lang:getCanonicalName()
				cats:insert("Dialect synonyms data modules|" .. langname)
				cats:insert(langname .. " dialect synonyms data modules| ")
				return "This module contains data on specific varieties of " .. langname .. ", for use by " ..
					"{{tl|dialect synonyms}}. The actual synonyms themselves are contained in submodules."
			end
		end,
	},
	{
		regex = "^Module:dialect synonyms/([a-z-]+)/(.+)$",
		process = function(title, cats, lang_code, term)
			local lang = lang_cache[lang_code]
			if lang then
				local langname = lang:getCanonicalName()
				cats:insert("Dialect synonyms data modules|" .. langname)
				cats:insert(langname .. " dialect synonyms data modules|" .. term)
				return ("This module contains dialectal %s synonyms for {{m|%s|%s}}."):format(langname, lang_code, term)
			end
		end,
	},
}

function export.show(frame)
	local params = {
		["hr"] = {},
		["for"] = {},
		["from"] = {},
		["notsubpage"] = { type = "boolean", default = false },
		["nodoc"] = { type = "boolean", default = false },
		["nolinks"] = { type = "boolean", default = false }, -- suppress all "Useful links"
	}
	
	local args = require("Module:parameters").process(frame.args, params)
	
	local output = Array('\n<div class="documentation" style="display:block; clear:both">\n')
	local cats = Array()
	
	local nodoc = args.nodoc
	
	if (not args.hr) or (args.hr == "above") then
		output:insert("----\n")
	end
	
	local title = args["for"] and mw.title.new(args["for"])	or mw.title.getCurrentTitle()
	local doc_title = args.from ~= "-" and mw.title.new(args.from or title.fullText .. '/documentation') or nil
	local contentModel = title.contentModel
	
	local pagetype = mw.getContentLanguage():lcfirst(title.nsText) .. " page"
	local preload, fallback_docs, doc_content, old_doc_title, user_name, skin_name, needs_doc
	local doc_content_source = "Module:documentation"
	local auto_generated_cat_source
	local cats_auto_generated = false
	
	if contentModel == "javascript" then
		pagetype = "script"
		if title.nsText == 'MediaWiki' then
			if title.text:find('Gadget-') then
				preload = 'Template:documentation/preloadGadget'
			else
				preload = 'Template:documentation/preloadMediaWikiJavaScript'
			end
		else
			preload  = 'Template:documentation/preloadTemplate' -- XXX
		end
		if title.nsText == 'User' then
			user_name = title.rootText
		end
	elseif contentModel == "css" then
		pagetype = "style sheet"
		preload  = 'Template:documentation/preloadTemplate' -- XXX
		if title.nsText == 'User' then
			user_name = title.rootText
		end
	elseif contentModel == "Scribunto" then
		pagetype = "module"
		user_name = title.rootText:match("^[Uu]ser:(.+)")
		if user_name then
			preload  = 'Template:documentation/preloadModuleSandbox'
		else
			preload  = 'Template:documentation/preloadModule'
		end
	elseif title.nsText == "Template" then
		pagetype = "template"
		preload  = 'Template:documentation/preloadTemplate'
	elseif title.nsText == "Wiktionary" then
		pagetype = "project page"
		preload  = 'Template:documentation/preloadTemplate' -- XXX
	end
	
	if doc_title and doc_title.isRedirect then
		old_doc_title = doc_title
		doc_title = mw.title.new(string.match(doc_title:getContent(),
			"^#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]]-)%]%]"))
	end

	output:insert("<dl class=\"plainlinks\" style=\"font-size: smaller;\">")

	local function get_module_doc_and_cats(categories_only)
		cats_auto_generated = true
		local automatic_cats = nil
		if user_name then
			fallback_docs = "documentation/fallback/user module"
			automatic_cats = {"User sandbox modules"}
		else
			for _, data in ipairs(module_regex) do
				local captures = {mw.ustring.match(title.fullText, data.regex)}
				if #captures > 0 then
					local cat
					local process_function
					if type(data.process) == "function" then
						process_function = data.process
					elseif type(data.process) == "string" then
						doc_content_source = "Module:documentation/functions/" .. data.process
						process_function = require(doc_content_source)
					end

					if process_function then
						doc_content = process_function(title, cats, unpack(captures))
					end
					if type(doc_content) == "table" then
						doc_content_source = doc_content.title and "Template:" .. doc_content.title or doc_content_source
						doc_content = mw.getCurrentFrame():expandTemplate(doc_content)
					elseif doc_content and doc_content:find("{{") then
						doc_content = mw.getCurrentFrame():preprocess(doc_content)
					end
					cat = data.cat
					
					if cat then
						if type(cat) == "string" then
							cat = {cat}
						end
						for _, c in ipairs(cat) do
							-- gsub() and Lua :gsub() return two arguments, which causes all sorts of problems.
							-- Terrible design, there should have been a separate two-argument function.
							local gsub_sucks = mw.ustring.gsub(title.fullText, data.regex, c)
							table.insert(cats, gsub_sucks)
						end
					end
					break
				end
			end
		end

		if title.subpageText == "templates" then
			cats:insert("Template interface modules")
		end

		if automatic_cats then
			for _, c in ipairs(automatic_cats) do
				cats:insert(c)
			end
		end
		
		if #cats == 0 then
			local auto_cats = require("Module:module categorization").categorize(frame, "return raw", "noerror")
			if #auto_cats > 0 then
				auto_generated_cat_source = "Module:module categorization"
			end
			for _, category in ipairs(auto_cats) do
				cats:insert(category)
			end
		end

		-- meaning module is not in user’s sandbox or one of many datamodule boring series
		needs_doc = not categories_only and not (automatic_cats or doc_content or fallback_docs)
	end

	-- Override automatic documentation, if present.
	if doc_title and doc_title.exists then
		local cats_auto_generated_text = ""
		if contentModel == "Scribunto" then
			local doc_page_content = doc_title:getContent()
			if doc_page_content and doc_page_content:find("< *includeonly *>") then
				track("module-includeonly")
			elseif doc_page_content and doc_page_content:find("{{module cat") then
				-- do nothing
			else
				get_module_doc_and_cats("categories only")
				auto_generated_cat_source = auto_generated_cat_source or doc_content_source
				cats_auto_generated_text = " Categories were auto-generated by [[" .. auto_generated_cat_source .. "]]. <sup>[[" ..
					mw.title.new(auto_generated_cat_source):fullUrl { action = "edit" } ..  " edit]]</sup>"
			end
		end

		output:insert(
			"<dd><i style=\"font-size: larger;\">The following " ..
			"[[Help:Documenting templates and modules|documentation]] is located at [[" ..
			doc_title.fullText .. "]]. " .. "<sup>[[" .. doc_title:fullUrl { action = "edit" } .. " edit]]</sup>" ..
			cats_auto_generated_text .. "</i></dd>")
	else
		if contentModel == "Scribunto" then
			get_module_doc_and_cats(false)
		elseif title.nsText == "Template" then
			--cats:insert("Uncategorized templates")
			needs_doc = not (fallback_docs or nodoc)
		elseif (contentModel == "css") or (contentModel == "javascript") then
			if user_name then
				skin_name = skins[title.text:sub(#title.rootText + 1):match("^/([a-z]+)%.[jc]ss?$")]
				if skin_name then
					fallback_docs = "documentation/fallback/user " .. contentModel
				end
			end
		end
		
		if doc_content then
			output:insert(
				"<dd><i style=\"font-size: larger;\">The following " ..
				"[[Help:Documenting templates and modules|documentation]] is " ..
				"generated by [[" .. doc_content_source .. "]]. <sup>[[" ..
				mw.title.new(doc_content_source):fullUrl { action = 'edit' } ..
				" edit]]</sup> </i></dd>")
		elseif not nodoc then
			if doc_title then
				output:insert(
					"<dd><i style=\"font-size:larger;\">Недостаје [[:en:Help:Documenting templates and modules|документациона подстрана]]. " ..
					(fallback_docs and "Ви бисте могли да " or "Молимо, ") ..
					"[" .. doc_title:fullUrl { action = 'edit', preload = preload }
					.. " направите је].</i></dd>\n")
			else
				output:insert(
					"<dd><i style=\"font-size: larger; color: #FF0000;\">Немогуће аутогенерисати документацију за: " .. pagetype ..".</i></dd>\n")
			end
		end
	end
	
	if title.fullText:match("^MediaWiki:Gadget%-") then
		local is_gadget = false
		local gadget_list = mw.title.new("MediaWiki:Gadgets-definition"):getContent()
		
		for line in mw.text.gsplit(gadget_list, "\n") do
			local gadget, opts, items = line:match("^%*%s*([A-Za-z][A-Za-z0-9_%-]*)%[(.-)%]|(.+)$") -- opts is unused
			if not gadget then
				gadget, items = line:match("^%*%s*([A-Za-z][A-Za-z0-9_%-]*)|(.+)$")
			end
			
			if gadget then
				items = Array(mw.text.split(items, "|"))
				for i, item in ipairs(items) do
					if title.fullText == ("MediaWiki:Gadget-" .. item) then
						is_gadget = true

						output:insert("<dd> ''This script is a part of the <code>")
						output:insert(gadget)
						output:insert("</code> gadget ([")
						output:insert(tostring(mw.uri.fullUrl('MediaWiki:Gadgets-definition', 'action=edit')))
						output:insert(" edit definitions])'' <dl>")
						
						output:insert("<dd> ''Description ([")
						output:insert(tostring(mw.uri.fullUrl('MediaWiki:Gadget-' .. gadget, 'action=edit')))
						output:insert(" edit])'': ")
						
						local gadget_description = mw.message.new('Gadget-' .. gadget):plain()
						gadget_description = frame:preprocess(gadget_description)
						output:insert(gadget_description)
						output:insert(" </dd>")

						items:remove(i)
						if #items > 0 then
							for j, item in ipairs(items) do
								items[j] = '[[MediaWiki:Gadget-' .. item .. '|' .. item .. ']]'
							end
							output:insert("<dd> ''Other parts'': ")
							output:insert(mw.text.listToText(items))
							output:insert("</dd>")
						end

						output:insert("</dl></dd>")

						break
					end
				end
			end
		end
		
		if not is_gadget then
			output:insert("<dd> ''This script is not a part of any [")
			output:insert(tostring(mw.uri.fullUrl('Special:Gadgets', 'uselang=en')))
			output:insert(' gadget] ([')
			output:insert(tostring(mw.uri.fullUrl('MediaWiki:Gadgets-definition', 'action=edit')))
			output:insert(' edit definitions]).</dd>')
		-- else
			-- cats:insert("Wiktionary gadgets")
		end
	end
	
	if old_doc_title then
		output:insert("<dd> ''Redirected from'' [")
		output:insert(old_doc_title:fullUrl { redirect = 'no' })
		output:insert(" ")
		output:insert(old_doc_title.fullText)
		output:insert("] ([")
		output:insert(old_doc_title:fullUrl { action = 'edit' })
		output:insert(" edit]).</dd>\n")
	end
	
	if not args.nolinks then	
		local links = Array()

		if title.isSubpage and not args.notsubpage then
			links:insert("[[:" .. title.nsText .. ":" .. title.rootText .. "|root page]]")
			links:insert("[[Special:PrefixIndex/" .. title.nsText .. ":" .. title.rootText .. "/|root page’s subpages]]")
		else
			links:insert("[[Special:PrefixIndex/" .. title.fullText .. "/|листа подстранице]]")
		end
		
		links:insert(
			'[' .. tostring(mw.uri.fullUrl('Special:WhatLinksHere/' .. title.fullText,
				'hidetrans=1&hideredirs=1')) .. ' линкови]')
	
		if contentModel ~= "Scribunto" then
			links:insert(
				'[' .. tostring(mw.uri.fullUrl('Special:WhatLinksHere/' .. title.fullText,
				'hidelinks=1&hidetrans=1')) .. ' преусмерења]')
		end
	
		if (contentModel == "javascript") or (contentModel == "css") then
			if user_name then
				links:insert("[[Special:MyPage" .. title.text:sub(#title.rootText + 1) .. "|your own]]")
			end
		else
			links:insert(
				'[' .. tostring(mw.uri.fullUrl('Special:WhatLinksHere/' .. title.fullText,
					'hidelinks=1&hideredirs=1')) .. ' укњучивања]')
		end
		
		if contentModel == "Scribunto" then
			local is_testcases = title.isSubpage and title.subpageText == "testcases"
			local without_subpage = title.nsText .. ":" .. title.baseText
			if is_testcases then
				links:insert("[[:" .. without_subpage .. "|tested module]]")
			else
				links:insert("[[" .. title.fullText .. "/testcases|testcases]]")
			end
			
			if user_name then
				links:insert("[[User:" .. user_name .. "|user page]]")
				links:insert("[[User talk:" .. user_name .. "|user talk page]]")
				links:insert("[[Special:PrefixIndex/User:" .. user_name .. "/|userspace]]")
			else
				-- If sandbox module, add a link to the module that this is a sandbox of.
				-- Exclude user sandbox modules like [[User:Dine/sandbox]].
				if title.text:find("/sandbox%d*%f[/%z]") then
					cats:insert("Sandbox modules")
					
					-- Sandbox modules don’t really need documentation.
					needs_doc = false
					
					-- Will behave badly if “/sandbox” occurs twice in title!
					local sandbox_of = title.fullText:gsub("/sandbox%d*%f[/%z]", "")
					
					local diff
					if page_exists(sandbox_of) then
						diff = " (" .. compare_pages(title.fullText, sandbox_of, "diff") .. ")"
					else
						track("no sandbox of")
					end
					
					links:insert("[[:" .. sandbox_of .. "|sandbox of]]" .. (diff or ""))
				
				-- If not a sandbox module, add link to sandbox module.
				-- Sometimes there are multiple sandboxes for a single module:
				-- [[Module:sa-pronunc/sandbox]],  [[Module:sa-pronunc/sandbox2]].
				-- Occasionally sandbox modules have their own subpages that are also
				-- sandboxes: [[Module:grc-decl/sandbox/decl]].
				else
					local sandbox_title
					if title.fullText:find("^Module:grc%-decl/") then
						sandbox_title = title.fullText:gsub("^Module:grc%-decl/", "Module:grc-decl/sandbox/")
					elseif is_testcases then
						sandbox_title = title.fullText:gsub("/testcases", "/sandbox/testcases")
					else
						sandbox_title = title.fullText .. "/sandbox"
					end
					local sandbox_link = "[[:" .. sandbox_title .. "|sandbox]]"
					
					local diff
					if page_exists(sandbox_title) then
						diff = " (" .. compare_pages(title.fullText, sandbox_title, "diff") .. ")"
					end
					
					links:insert(sandbox_link .. (diff or ""))
				end
			end
		end
		
		if title.nsText == "Template" then
			-- Error search: all(any namespace), hastemplate (show pages using the template), insource (show source code), incategory (any/specific error) -- [[mw:Help:CirrusSearch]], [[w:Help:Searching/Regex]]
			-- apparently same with/without: &profile=advanced&fulltext=1
			local errorq = 'searchengineselect=mediawiki&search=all: hastemplate:\"'..title.rootText..'\" insource:\"'..title.rootText..'\" incategory:'
			local eincategory = "Pages_with_module_errors|ParserFunction_errors|DisplayTitle_errors|Pages_with_ISBN_errors|Pages_with_ISSN_errors|Pages_with_reference_errors|Pages_with_syntax_highlighting_errors|Pages_with_TemplateStyles_errors"
			
			links:insert(
				'[' .. tostring(mw.uri.fullUrl('Special:Search', errorq..eincategory )) .. ' errors]'
				.. ' (' ..
				'[' .. tostring(mw.uri.fullUrl('Special:Search', errorq..'ParserFunction_errors' )) .. ' parser]'
				.. '/' ..
				'[' .. tostring(mw.uri.fullUrl('Special:Search', errorq..'Pages_with_module_errors' )) .. ' module]'
				.. ')'
			)
			
			if title.isSubpage and title.text:find("/sandbox%d*%f[/%z]") then -- This is a sandbox template.
				-- At the moment there are no user sandbox templates with subpage
				-- “/sandbox”.
				cats:insert("Sandbox templates")
				
				-- Sandbox templates don’t really need documentation.
				needs_doc = false
				
				-- Will behave badly if “/sandbox” occurs twice in title!
				local sandbox_of = title.fullText:gsub("/sandbox%d*%f[/%z]", "")
				
				local diff
				if page_exists(sandbox_of) then
					diff = " (" .. compare_pages(title.fullText, sandbox_of, "diff") .. ")"
				else
					track("no sandbox of")
				end
				
				links:insert("[[:" .. sandbox_of .. "|sandbox of]]" .. (diff or ""))
			else -- This is a template that can have a sandbox.
				local sandbox_title = title.fullText .. "/sandbox"
				
				local diff
				if page_exists(sandbox_title) then
					diff = " (" .. compare_pages(title.fullText, sandbox_title, "diff") .. ")"
				end
				
				links:insert("[[:" .. sandbox_title .. "|sandbox]]" .. (diff or ""))
			end
		end
		
		if #links > 0 then
			output:insert("<dd> ''Корисни линкови'': " .. links:concat(" • ") .. "</dd>")
		end
	end
	
	output:insert("</dl>\n")
	
	-- Show error from [[Module:category tree/topic cat/data]] on its submodules'
	-- documentation to, for instance, warn about duplicate labels.
	if title.fullText:find("Module:category tree/topic cat/data", 1, true) == 1 then
		local ok, err = pcall(require, "Module:category tree/topic cat/data")
		if not ok then
			output:insert('<span class="error">' .. err .. '</span>\n\n')
		end
	end
	
	if doc_title and doc_title.exists then
		-- Override automatic documentation, if present.
		doc_content = frame:expandTemplate { title = doc_title.fullText }
	elseif not doc_content and fallback_docs then
		doc_content = frame:expandTemplate {
			title = fallback_docs,
			args = {
				['user'] = user_name,
				['page'] = title.fullText,
				['skin name'] = skin_name,
			},
		}
	end

	if doc_content then
		output:insert(doc_content)
	end

	output:insert(('\n<%s style="clear: both;" />'):format(args.hr == "below" and "hr" or "br"))
	
	if cats_auto_generated and not cats[1] and (not doc_content or not doc_content:find("%[%[Category:")) then
		if contentModel == "Scribunto" then
			cats:insert("Uncategorized modules")
		-- elseif title.nsText == "Template" then
			-- cats:insert("Uncategorized templates")
		end
	end
	
	if needs_doc then
		cats:insert("Templates and modules needing documentation")
	end
	
	for _, cat in ipairs(cats) do
		output:insert("[[Category:" .. cat .. "]]")
	end
	
	output:insert("</div>\n")

	return output:concat()
end

function export.module_auto_doc_table()
	local parts = {}
	local function ins(text)
		table.insert(parts, text)
	end
	ins('{|class="wikitable"')
	ins("! Regex !! Category !! Handling modules")
	for _, spec in ipairs(module_regex) do
		local cat_text
		local cats = spec.cat
		if cats then
			local cat_parts = {}
			if type(cats) == "string" then
				cats = {cats}
			end
			for _, cat in ipairs(cats) do
				table.insert(cat_parts, ("<code>%s</code>"):format((cat:gsub("|", "&#124;"))))
			end
			cat_text = table.concat(cat_parts, ", ")
		else
			cat_text = "''(unspecified)''"
		end
		ins("|-")
		ins(("| <code>%s</code> || %s || %s"):format(spec.regex, cat_text,
			type(spec.process) == "function" and "''(handled internally)''" or
			type(spec.process) == "string" and ("[[Module:documentation/functions/%s]]"):format(spec.process) or
			"''(no documentation generator)''"))
	end
	ins("|}")
	return table.concat(parts, "\n")
end

-- Used by {{translit module documentation}}.
function export.translitModuleLangList(frame)
	local pagename, subpage
	
	if frame.args[1] then
		pagename = frame.args[1]
	else
		local title = mw.title.getCurrentTitle()
		subpage = title.subpageText
		pagename = title.text
		
		if subpage ~= pagename then
			pagename = title.rootText
		end
	end
	
	local translitModule = pagename
	
	local languageObjects = require("Module:languages/byTranslitModule")(translitModule)
	local codeInPagename = pagename:match("^([%l-]+)%-.*translit$")
	
	local categories = Array()
	local codeInPagenameInList = false
	if codeInPagename then
		if languageObjects[1] and subpage ~= "documentation" then
			local agreement = languageObjects[2] and "s" or ""
			categories:insert("[[Category:Transliteration modules used by " ..
				#languageObjects .. " language" .. agreement .. "]]")
		end
		
		languageObjects = Array(languageObjects)
			:filter(
				function (lang)
					local result = lang:getCode() ~= codeInPagename
					codeInPagenameInList = codeInPagenameInList or result
					return result
				end)
	end
	
	if subpage ~= "documentation" then
		for script_code in pagename:gmatch("%f[^-%z]%u%l%l%l%f[-]") do
			local script = require "Module:scripts".getByCode(script_code)
			if script then
				categories:insert("[[Category:" .. script:getCategoryName() .. "]]")
			end
		end
	end
	
	if subpage ~= "documentation" and not page_exists("Module:" .. pagename .. "/testcases") then
		categories:insert("[[Category:Transliteration modules without a testcases subpage]]")
	end
	
	if not languageObjects[1] then
		return categories:concat()
	end
	
	local langs = Array(languageObjects)
		:sort(
			function(lang1, lang2)
				return lang1:getCode() < lang2:getCode()
			end)
		-- This will not error because languageObjects is not empty.
		:map(languageObjects[1].makeCategoryLink)
		:serial_comma_join()
	
	return "It is " .. ( codeInPagenameInList and "also" or "" ) ..
		" used to transliterate " .. langs .. "." .. categories:concat()
end

-- Used by {{entry name module documentation}}.
function export.entryNameModuleLangList(frame)
	local pagename, subpage
	
	if frame.args[1] then
		pagename = frame.args[1]
	else
		local title = mw.title.getCurrentTitle()
		subpage = title.subpageText
		pagename = title.text
		
		if subpage ~= pagename then
			pagename = title.rootText
		end
	end
	
	local entryNameModule = pagename
	
	local languageObjects = require("Module:languages/byEntryNameModule")(entryNameModule)
	local codeInPagename = pagename:match("^([%l-]+)%-.*entryname$")
	
	local categories = Array()
	local codeInPagenameInList = false
	if codeInPagename then
		if languageObjects[1] and subpage ~= "documentation" then
			local agreement = languageObjects[2] and "s" or ""
			categories:insert("[[Category:Entry name-generating modules used by " ..
				#languageObjects .. " language" .. agreement .. "]]")
		end
		
		languageObjects = Array(languageObjects)
			:filter(
				function (lang)
					local result = lang:getCode() ~= codeInPagename
					codeInPagenameInList = codeInPagenameInList or result
					return result
				end)
	end
	
	if subpage ~= "documentation" then
		for script_code in pagename:gmatch("%f[^-%z]%u%l%l%l%f[-]") do
			local script = require "Module:scripts".getByCode(script_code)
			if script then
				categories:insert("[[Category:" .. script:getCategoryName() .. "]]")
			end
		end
	end
	
	if subpage ~= "documentation" and not page_exists("Module:" .. pagename .. "/testcases") then
		categories:insert("[[Category:Entry name-generating modules without a testcases subpage]]")
	end
	
	if not languageObjects[1] then
		return categories:concat()
	end
	
	local langs = Array(languageObjects)
		:sort(
			function(lang1, lang2)
				return lang1:getCode() < lang2:getCode()
			end)
		-- This will not error because languageObjects is not empty.
		:map(languageObjects[1].makeCategoryLink)
		:serial_comma_join()
	
	return "It is " .. ( codeInPagenameInList and "also" or "" ) ..
		" used to generate entry names for " .. langs .. "." .. categories:concat()
end

-- Used by {{sortkey module documentation}}.
function export.sortkeyModuleLangList(frame)
	local pagename, subpage
	
	if frame.args[1] then
		pagename = frame.args[1]
	else
		local title = mw.title.getCurrentTitle()
		subpage = title.subpageText
		pagename = title.text
		
		if subpage ~= pagename then
			pagename = title.rootText
		end
	end
	
	local sortkeyModule = pagename
	
	local languageObjects = require("Module:languages/bySortkeyModule")(sortkeyModule)
	local codeInPagename = pagename:match("^([%l-]+)%-.*sortkey$")
	
	local categories = Array()
	local codeInPagenameInList = false
	if codeInPagename then
		if languageObjects[1] and subpage ~= "documentation" then
			local agreement = languageObjects[2] and "s" or ""
			categories:insert("[[Category:Sortkey-generating modules used by " ..
				#languageObjects .. " language" .. agreement .. "]]")
		end
		
		languageObjects = Array(languageObjects)
			:filter(
				function (lang)
					local result = lang:getCode() ~= codeInPagename
					codeInPagenameInList = codeInPagenameInList or result
					return result
				end)
	end
	
	if subpage ~= "documentation" then
		for script_code in pagename:gmatch("%f[^-%z]%u%l%l%l%f[-]") do
			local script = require "Module:scripts".getByCode(script_code)
			if script then
				categories:insert("[[Category:" .. script:getCategoryName() .. "]]")
			end
		end
	end
	
	if subpage ~= "documentation" and not page_exists("Module:" .. pagename .. "/testcases") then
		categories:insert("[[Category:Sortkey-generating modules without a testcases subpage]]")
	end
	
	if not languageObjects[1] then
		return categories:concat()
	end
	
	local langs = Array(languageObjects)
		:sort(
			function(lang1, lang2)
				return lang1:getCode() < lang2:getCode()
			end)
		-- This will not error because languageObjects is not empty.
		:map(languageObjects[1].makeCategoryLink)
		:serial_comma_join()
	
	return "It is " .. ( codeInPagenameInList and "also" or "" ) ..
		" used to sort " .. langs .. "." .. categories:concat()
end

return export