Module:Documentation

    From Nonbinary Wiki
    Revision as of 08:52, 20 January 2014 by m>Mr. Stradivarius (convert a stray message name)

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

    -- This module implements {{documentation}}.
    
    -- Get required modules.
    local getArgs = require('Module:Arguments').getArgs
    local htmlBuilder = require('Module:HtmlBuilder')
    local messageBox = require('Module:Message box')
    
    -- Get the config table.
    local cfg = mw.loadData('Module:Documentation/config')
    
    local p = {}
    
    -- Often-used functions.
    local ugsub = mw.ustring.gsub
    
    ----------------------------------------------------------------------------
    -- Helper functions
    --
    -- These are defined as local functions, but are made available in the p
    -- table for testing purposes.
    ----------------------------------------------------------------------------
    
    local function message(cfgKey, valArray, expectType)
    	--[[
    	-- Gets a message from the cfg table and formats it if appropriate.
    	-- The function raises an error if the value from the cfg table is not
    	-- of the type expectType. The default type for expectType is 'string'.
    	-- If the table valArray is present, strings such as $1, $2 etc. in the
    	-- message are substituted with values from the table keys [1], [2] etc.
    	-- For example, if the message cfg.fooMessage had the value 'Foo $2 bar $1.',
    	-- message('foo-message', {'baz', 'qux'}) would return "Foo qux bar baz."
    	--]]
    	local msg = cfg[cfgKey]
    	expectType = expectType or 'string'
    	if type(msg) ~= expectType then
    		error('message: type error in message cfg.' .. cfgKey .. ' (' .. expectType .. ' expected, got ' .. type(msg) .. ')', 2)
    	end
    	if not valArray then
    		return msg
    	end
    
    	local function getMessageVal(match)
    		match = tonumber(match)
    		return valArray[match] or error('message: no value found for key $' .. match .. ' in message cfg.' .. cfgKey, 4)
    	end
    
    	local ret = ugsub(msg, '$([1-9][0-9]*)', getMessageVal)
    	return ret
    end
    
    p.message = message
    
    local function makeWikilink(page, display)
    	if display then
    		return mw.ustring.format('[[%s|%s]]', page, display)
    	else
    		return mw.ustring.format('[[%s]]', page)
    	end
    end
    
    p.makeWikilink = makeWikilink
    
    local function makeCategoryLink(cat, sort)
    	local catns = mw.site.namespaces[14].name
    	return makeWikilink(catns .. ':' .. cat, sort)
    end
    
    p.makeCategoryLink = makeCategoryLink
    
    local function makeUrlLink(url, display)
    	return mw.ustring.format('[%s %s]', url, display)
    end
    
    p.makeUrlLink = makeUrlLink
    
    local function makeToolbar(...)
    	local ret = {}
    	local lim = select('#', ...)
    	if lim < 1 then
    		return nil
    	end
    	for i = 1, lim do
    		ret[#ret + 1] = select(i, ...)
    	end
    	return '<small style="font-style: normal;">(' .. table.concat(ret, ' &#124; ') .. ')</small>'
    end	
    
    p.makeToolbar = makeToolbar
    
    ----------------------------------------------------------------------------
    -- 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)
    	local env = p.getEnvironment(args)
    	local root = htmlBuilder.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))
    		.newline()
    		.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.
    	--
    	-- 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.subjectSpace - the number of the title's subject namespace.
    	-- env.docSpace - the number of the namespace the title puts its documentation in.
    	-- env.docpageRoot - 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)
    			if not title then
    				error(message('title-arg-error', {titleArg}))
    			end
    		else
    			title = mw.title.getCurrentTitle()
    		end
    		return title
    	end
    
    	function envFuncs.templateTitle()
    		-- The template (or module, etc.) title object.
    		local title = env.title
    		local subpage = title.subpageText
    		if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
    			return title.basePageTitle
    		else
    			return title
    		end
    	end
    
    	function envFuncs.docTitle()
    		-- Title object of the /doc subpage.
    		local title = env.title
    		local docname = args[1] -- User-specified doc page.
    		local docpage
    		if docname then
    			docpage = docname
    		else
    			docpage = env.docpageRoot .. '/' .. message('doc-subpage')
    		end
    		return mw.title.new(docpage)
    	end
    	
    	function envFuncs.sandboxTitle()
    		-- Title object for the /sandbox subpage.
    		return mw.title.new(env.docpageRoot .. '/' .. message('sandbox-subpage'))
    	end
    	
    	function envFuncs.testcasesTitle()
    		-- Title object for the /testcases subpage.
    		return mw.title.new(env.docpageRoot .. '/' .. message('testcases-subpage'))
    	end
    	
    	function envFuncs.printTitle()
    		-- Title object for the /Print subpage.
    		return env.templateTitle:subPageTitle(message('print-subpage'))
    	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.docpageRoot()
    		-- 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
    		local compareUrl = mw.uri.fullUrl(
    			'Special:ComparePages',
    			{page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
    		)
    		return tostring(compareUrl)
    	end		
    
    	return env
    end	
    
    ----------------------------------------------------------------------------
    -- Auxiliary templates
    ----------------------------------------------------------------------------
    
    function p.sandboxNotice(args, env)
    	local title = env.title
    	local sandboxTitle = env.sandboxTitle
    	local templateTitle = env.templateTitle
    	if not (title and sandboxTitle and templateTitle and mw.title.equals(title, sandboxTitle)) then
    		return nil
    	end
    	local omargs = {} -- Args for {{ombox}}.
    	-- Get the image wikitext.
    	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 frame = mw.getCurrentFrame()
    	local isPreviewing = frame:preprocess('{{REVISIONID}}') == '' -- True if the page is being previewed.
    	local templateLink = makeWikilink(templateTitle.prefixedText)
    	local compareUrl = env.compareUrl
    	if isPreviewing or not compareUrl then
    		-- 'This is the [[Wikipedia:Template test cases|template sandbox]] page for $1.'
    		text = text .. message('sandbox-notice-blurb', {templateLink})
    	else
    		-- 'This is the [[Wikipedia:Template test cases|template sandbox]] page for $1 ($2).'
    		local compareDisplay = message('sandbox-notice-compare-link-display')
    		local compareLink = makeUrlLink(compareUrl, compareDisplay)
    		text = text .. message('sandbox-notice-diff-blurb', {templateLink, compareLink})
    	end
    	-- Get the test cases page blurb if the page exists.
    	local testcasesTitle = env.testcasesTitle
    	if testcasesTitle and testcasesTitle.exists then
    		local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
    		local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
    		text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
    	end
    	-- Add the page to [[Category:Template sandboxes]].
    	text = text .. makeCategoryLink(message('sandbox-category'))
    	omargs.text = text
    	return messageBox.main('ombox', omargs)
    end
    
    function p.protectionTemplate(env)
    	local title = env.title
    	local protectionTemplate = message('protection-template')
    	if not (protectionTemplate and title.namespace == 10) then
    		-- Don't display the protection template if we are not in the template namespace.
    		return nil
    	end
    	local frame = mw.getCurrentFrame()
    	local function getProtectionLevel(protectionType, page)
    		-- Gets the protection level for page, or for the current page if page is not specified.
    		local level = frame:callParserFunction('PROTECTIONLEVEL', protectionType, page)
    		if level ~= '' then
    			return level
    		else
    			return nil -- The parser function returns the blank string if there is no match.
    		end
    	end
    	local prefixedTitle = title.prefixedText
    	if getProtectionLevel('move', prefixedTitle) == 'sysop' or getProtectionLevel('edit', prefixedTitle) then
    		-- The page is full-move protected, or full, template, or semi-protected.
    		return frame:expandTemplate{title = protectionTemplate, args = message('protection-template-args', nil, 'table')}
    	end
    	return nil
    end
    
    ----------------------------------------------------------------------------
    -- Start box
    ----------------------------------------------------------------------------
    
    p.startBox = makeInvokeFunc('_startBox')
    
    function p._startBox(args, env)
    	-- Generate [view][edit][history][purge] or [create] links.
    	local links
    	local content = args.content
    	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)
    	local data = {}
    	-- Get title objects.
    	local title = env.title
    	local docTitle = env.docTitle
    	if not title or not docTitle then
    		return nil
    	end
    	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 env.subjectSpace == 6 then -- File namespace
    			preload = message('file-docpage-preload')
    		else
    			preload = message('docpage-preload')
    		end
    	end
    	data.preload = preload
    	data.createLinkDisplay = message('create-link-display')
    	return data
    end
    
    function p.renderStartBoxLinks(data)
    	-- Render the [view][edit][history][purge] or [create] links.
    	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 = ret:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
    		ret = ret:gsub('%]', '&#93;')
    		ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
    	else
    		ret = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
    	end
    end
    
    function p.makeStartBoxData(args, env, links)
    	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
    	
    	-- [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.
    	local sbox = htmlBuilder.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)
    	local docTitle = env.docTitle
    	local content = args.content
    	if not content and docTitle and docTitle.exists then
    		local frame = mw.getCurrentFrame()
    		content = frame:preprocess('{{ ' .. 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
    
    ----------------------------------------------------------------------------
    -- End box
    ----------------------------------------------------------------------------
    
    p.endBox = makeInvokeFunc('_endBox')
    
    function p._endBox(args, env)
    	-- This function generates the end box (also known as the link box).
    	
    	-- Get environment data.
    	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.
    	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 = message('fmbox-image-none') -- Sets '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
    		-- Use custom link box content if it is defined.
    		text = text .. linkBox
    	else
    		text = text .. (p.makeDocPageBlurb(args, env) or '')
    		-- Add links to /sandbox and /testcases when appropriate.
    		if subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10 then
    			-- We are in the user, module or template namespaces. 
    			text = text .. p.makeEndBoxExperimentBlurb(args, env)
    			text = text .. '<br />'
    			-- Show the categories text, but not if "content" fed or "docname fed"
    			-- since then it is unclear where to add the categories.
    			if not content and not docnameFed then
    				text = text .. (p.makeCategoriesBlurb(args, env) or '')
    			end
    			-- Show the "subpages" link.
    			if subjectSpace ~= 6 then -- Don't show the link in file space.
    				text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '')
    			end
    			-- Show the "print" link if it exists.
    			local printBlurb = p.makePrintBlurb(args, env)
    			if printBlurb then
    				text = text .. '<br />' .. printBlurb
    			end
    		end
    	end
    	fmargs.text = text
    
    	-- Return the fmbox output.
    	return messageBox.main('fmbox', fmargs)
    end
    
    function p.makePrintBlurb(args, env)
    	-- Get the /Print title object
    	local printTitle = env.printTitle
    	if not printTitle then
    		return nil
    	end
    	-- Make the print blurb.
    	local ret
    	if printTitle.exists then
    		local printLink = makeWikilink(printTitle.prefixedText, message('print-link-display'))
    		ret = message('print-blurb', {printLink})
    		local displayPrintCategory = message('display-print-category', nil, 'boolean')
    		if displayPrintCategory then
    			ret = ret .. makeCategoryLink(message('print-category'))
    		end
    	end
    	return ret
    end
    
    function p.makeSubpagesBlurb(args, env)
    	-- Get the template title object
    	local subjectSpace = env.subjectSpace
    	local templateTitle = env.templateTitle
    	if not subjectSpace or not templateTitle then
    		return nil
    	end
    	-- Make the subpages blurb.
    	local pagetype
    	if subjectSpace == 10 then
    		pagetype = message('template-pagetype')
    	elseif subjectSpace == 828 then
    		pagetype = message('module-pagetype')
    	else
    		pagetype = message('default-pagetype')
    	end
    	return makeWikilink(
    		'Special:PrefixIndex/' .. templateTitle.prefixedText .. '/',
    		message('subpages-link-display', {pagetype})
    	)
    end
    
    function p.makeCategoriesBlurb(args, env)
    	-- Get the title object.
    	local docTitle = env.docTitle
    	if not docTitle then
    		return nil
    	end
    	-- Make the blurb.
    	local docPathLink = makeWikilink(docTitle.prefixedText, message('doc-link-display'))
    	return message('add-categories-blurb', {docPathLink})
    end
    
    function p.makeDocPageBlurb(args, env)
    	-- Get the title object.
    	local docTitle = env.docTitle
    	if not docTitle then
    		return nil
    	end
    	-- Make the blurb.
    	local ret
    	if docTitle.exists then
    		-- /doc exists; link to it.
    		local docLink = makeWikilink(docTitle.prefixedText)
    		local editUrl = docTitle:fullUrl{action = 'edit'}
    		local editDisplay = message('edit-link-display')
    		local editLink = makeUrlLink(editUrl, editDisplay)
    		local historyUrl = docTitle:fullUrl{action = 'history'}
    		local historyDisplay = message('history-link-display')
    		local historyLink = makeUrlLink(historyUrl, historyDisplay)
    		ret = message('transcluded-from-blurb', {docLink})
    			.. ' '
    			.. makeToolbar(editLink, historyLink)
    			.. '<br />'
    	elseif env.subjectSpace == 828 then
    		-- /doc does not exist; ask to create it.
    		local createUrl = docTitle:fullUrl{action = 'edit', preload = message('module-preload')}
    		local createDisplay = message('create-link-display')
    		local createLink = makeUrlLink(createUrl, createDisplay)
    		ret = message('create-module-doc-blurb', {createLink})
    			.. '<br />'
    	end
    	return ret
    end
    
    function p.makeEndBoxExperimentBlurb(args, env)
    	-- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
    	-- Get environment data.
    	local subjectSpace = env.subjectSpace
    	local templateTitle = env.templateTitle
    	local sandboxTitle = env.sandboxTitle
    	local testcasesTitle = env.testcasesTitle
    	local templatePage = templateTitle.prefixedText
    	if not subjectSpace or not templateTitle or not sandboxTitle or not testcasesTitle then
    		return nil
    	end
    	-- Make links.
    	local sandboxLinks, testcasesLinks
    	if sandboxTitle.exists then
    		local sandboxPage = sandboxTitle.prefixedText
    		local sandboxDisplay = message('sandbox-link-display')
    		local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
    		local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
    		local sandboxEditDisplay = message('sandbox-edit-link-display')
    		local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
    		local compareUrl = env.compareUrl
    		local compareLink
    		if compareUrl then
    			local compareDisplay = message('compare-link-display')
    			compareLink = makeUrlLink(compareUrl, compareDisplay)
    		end
    		sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
    	else
    		local sandboxPreload
    		if subjectSpace == 828 then
    			sandboxPreload = message('module-sandbox-preload')
    		else
    			sandboxPreload = message('template-sandbox-preload')
    		end
    		local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
    		local sandboxCreateDisplay = message('sandbox-create-link-display')
    		local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
    		local mirrorSummary = message('mirror-edit-summary', {makeWikilink(templatePage)})
    		local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = templatePage, summary = mirrorSummary}
    		local mirrorDisplay = message('mirror-link-display')
    		local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
    		sandboxLinks = message('sandbox-link-display') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
    	end
    	if testcasesTitle.exists then
    		local testcasesPage = testcasesTitle.prefixedText
    		local testcasesDisplay = message('testcases-link-display')
    		local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
    		local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
    		local testcasesEditDisplay = message('testcases-edit-link-display')
    		local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
    		testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
    	else
    		local testcasesPreload
    		if subjectSpace == 828 then
    			testcasesPreload = message('module-testcases-preload')
    		else
    			testcasesPreload = message('template-testcases-preload')
    		end
    		local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
    		local testcasesCreateDisplay = message('testcases-create-link-display')
    		local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
    		testcasesLinks = message('testcases-link-display') .. ' ' .. makeToolbar(testcasesCreateLink)
    	end
    	local messageName
    	if subjectSpace == 828 then
    		messageName = 'experiment-blurb-module'
    	else
    		messageName = 'experiment-blurb-template'
    	end
    	return message(messageName, {sandboxLinks, testcasesLinks})
    end
    
    ----------------------------------------------------------------------------
    -- Tracking categories
    ----------------------------------------------------------------------------
    
    function p.addTrackingCategories(env)
    	-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
    	local title = env.title
    	local ret = ''
    	local subpage = title.subpageText
    	if message('display-strange-usage-category', nil, 'boolean') and (subpage == message('doc-subpage') or subpage == message('testcases-subpage')) then
    		local sort = (title.namespace == 0 and message('strange-usage-category-mainspace-sort') or '') .. title.prefixedText -- Sort on namespace.
    		ret = ret .. makeCategoryLink(message('strange-usage-category'), sort)
    	end
    	return ret
    end
    
    return p