Editing Module:Documentation

-- This module implements {{documentation}}.

-- Get required modules.
local getArgs = require('Module:Arguments').getArgs
local htmlBuilder = require('Module:HtmlBuilder')
local messageBox = require('Module:Message box')
local libraryUtil = require('libraryUtil')

-- Get the config table.
local cfg = mw.loadData('Module:Documentation/config')

local p = {}

-- Constants.
local currentTitle = mw.title.getCurrentTitle()
local subjectSpace = mw.site.namespaces[currentTitle.namespace].subject.id -- The number of the current subject namespace.

-- Often-used functions.
local gsub = mw.ustring.gsub
local checkType = libraryUtil.checkType

----------------------------------------------------------------------------
-- Helper functions
----------------------------------------------------------------------------

local function formatMessage(cfgKey, valArray)
	--[[
	-- Formats a message from the cfg table.
	-- Values from valArray can be specified in the message by using $1 for [1], $2 for [2], etc.
	-- For example, if the message cfg.fooMessage had the value 'Foo $2 bar $1.',
	-- formatMessage('fooMessage', {'baz', 'qux'}) would return "Foo qux bar baz."
	--]]
	checkType('formatMessage', 1, cfgKey, 'string')
	checkType('formatMessage', 2, valArray, 'table')
	local msg = cfg[cfgKey] or error('formatMessage: no message found for cfg key "' .. cfgKey .. '"', 2)

	local function getMessageVal(match)
		match = tonumber(match)
		return valArray[match] or error('formatMessage: no value found for key $' .. match .. ' in message cfg.' .. cfgKey, 4)
	end

	local ret = gsub(msg, '$([1-9][0-9]*)', getMessageVal)
	return ret
end

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

local function makeCategoryLink(cat, sort)
	local catns = mw.site.namespaces[14].name
	return makeWikilink(catns .. '/' .. cat, sort)
end

local function makeUrlLink(url, display)
	return mw.ustring.format('[%s %s]', url, display)
end

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	

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

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

----------------------------------------------------------------------------
-- Main functions
----------------------------------------------------------------------------

p.main = makeInvokeFunc('_main')

function p._main(args)
	local root = htmlBuilder.create()
	root
		.wikitext(p.protectionTemplate())
		.wikitext(p.sandboxNotice(args))
		 -- 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', cfg.mainDivId)
			.addClass(cfg.mainDivClasses)
			.wikitext(p._startBox(args))
			.wikitext(p._content(args))
			.tag('div')
				.css('clear', 'both') -- So right or left floating items don't stick out of the doc box.
				.done()
			.done()
		.wikitext(p._endBox(args))
		.wikitext(p.addTrackingCategories())
	return tostring(root)
end

function p.sandboxNotice(args)
	local sandboxNoticeTemplate = cfg.sandboxNoticeTemplate
	if not (sandboxNoticeTemplate and currentTitle.subpageText == cfg.sandboxSubpage) then
		return nil
	end
	local frame = mw.getCurrentFrame()
	local notice = htmlBuilder.create()
	notice
		.tag('div')
			.css('clear', 'both')
			.done()
		.wikitext(frame:expandTemplate{title = sandboxNoticeTemplate, args = {[cfg.sandboxNoticeLivepageParam] = args[cfg.livepageArg]}})
	return tostring(notice)
end

function p.protectionTemplate()
	local protectionTemplate = cfg.protectionTemplate
	if not (protectionTemplate and currentTitle.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)
		-- Gets the protection level for the current page.
		local level = frame:callParserFunction('PROTECTIONLEVEL', protectionType)
		if level ~= '' then
			return level
		else
			return nil -- The parser function returns the blank string if there is no match.
		end
	end
	if getProtectionLevel('move') == 'sysop' or getProtectionLevel('edit') then
		-- The page is full-move protected, or full, template, or semi-protected.
		return frame:expandTemplate{title = protectionTemplate, args = cfg.protectionTemplateArgs}
	end
	return nil
end

p.startBox = makeInvokeFunc('_startBox')

function p._startBox(args)
	-- Arg processing from {{documentation}}.
	local preload = args[cfg.preloadArg] -- Allow custom preloads.
	local heading = args[cfg.headingArg] -- Blank values are not removed.
	local headingStyle = args[cfg.headingStyleArg]
	local content = args[cfg.contentArg]
	local docspace = p.docspace()
	local docname = args[1] -- Other docname, if fed.
	local templatePage = p.templatePage()

	-- Arg processing from {{documentation/start box2}}.
	local docpage
	if docname then
		docpage = docname
	else
		local namespace = docspace or currentTitle.nsText
		local pagename = templatePage or currentTitle.text
		docpage = namespace .. ':' .. pagename .. '/' .. cfg.docSubpage
	end
	local docTitle = mw.title.new(docpage)
	local docExist = docTitle.exists
	
	-- Output from {{documentation/start box}}.

	-- First, check the heading parameter.
	if heading == '' then
		-- Heading is defined but blank, so do nothing.
		return nil
	end

	-- Build the start box div.
	local sbox = htmlBuilder.create('div')
	sbox
		.css('padding-bottom', '3px')
		.css('border-bottom', '1px solid #aaa')
		.css('margin-bottom', '1ex')

	-- Make the heading.
	local hspan = sbox.tag('span')
	if headingStyle then
		hspan.cssText(headingStyle)
	elseif subjectSpace == 10 then
		-- We are in the template or template talk namespaces.
		hspan
			.css('font-weight', 'bold')
			.css('fond-size', '125%')
	else
		hspan.css('font-size', '150%')
	end
	if heading then
		-- "heading" has data.
		hspan.wikitext(heading)
	elseif subjectSpace == 10 then -- Template namespace
		hspan.wikitext(cfg.documentationIconWikitext .. ' ' .. cfg.templateNamespaceHeading)
	elseif subjectSpace == 828 then -- Module namespace
		hspan.wikitext(cfg.documentationIconWikitext .. ' ' .. cfg.moduleNamespaceHeading)
	elseif subjectSpace == 6 then -- File namespace
		hspan.wikitext(cfg.fileNamespaceHeading)
	else
		hspan.wikitext(cfg.otherNamespaceHeading)
	end

	-- Add the [view][edit][history][purge] or [create] links.
	-- Check for the content parameter first, as we don't need the links if the documentation
	-- content is being entered directly onto the template page.
	if not content then
		local lspan = sbox.tag('span') -- lspan is short for "link span".
		lspan
			.addClass(cfg.startBoxLinkclasses)
			.attr('id', cfg.startBoxLinkId)
		if docExist then
			local viewLink = makeWikilink(docpage, cfg.viewLinkDisplay)
			local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, cfg.editLinkDisplay)
			local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, cfg.historyLinkDisplay)
			local purgeLink = makeUrlLink(currentTitle:fullUrl{action = 'purge'}, cfg.purgeLinkDisplay)
			local text = '[%s] [%s] [%s] [%s]'
			text = text:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
			text = text:gsub('%]', '&#93;')
			lspan.wikitext(mw.ustring.format(text, viewLink, editLink, historyLink, purgeLink))
		else
			if not preload then
				if subjectSpace == 6 then -- File namespace
					preload = cfg.fileDocpagePreload
				else
					preload = cfg.docpagePreload
				end
			end
			lspan.wikitext(makeUrlLink(docTitle:fullUrl{action = 'edit', preload = preload}, cfg.createLinkDisplay))
		end
	end

	return tostring(sbox)
end

p.content = makeInvokeFunc('_content')

function p._content(args)
	local content = args[cfg.contentArg]
	if not content then
		local docpage = args[1]
		if docpage and mw.title.new(docpage).exists then
			local frame = mw.getCurrentFrame()
			content = frame:preprocess('{{ ' .. docpage .. ' }}')
		else
			docpage = p.docspace() .. ':' .. p.templatePage() .. '/' .. cfg.docSubpage
			if mw.title.new(docpage).exists then
				local frame = mw.getCurrentFrame()
				content = frame:preprocess('{{ ' .. docpage .. ' }}')
			end
		end
	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.endBox = makeInvokeFunc('_endBox')

function p._endBox(args)
	-- Argument processing in {{documentation}}.
	local content = args[cfg.contentArg]
	local linkBox = args[cfg.linkBoxArg] -- So "link box=off" works.
	local docspace = p.docspace()
	local docname = args[1] -- Other docname, if fed.
	local templatePage = p.templatePage()

	-- Argument processing in {{documentation/end box2}}.
	local docpageRoot = (docspace or currentTitle.nsText) .. ':' .. (templatePage or currentTitle.text)
	local docpage
	if docname then
		docpage = docname
	else
		docpage = docpageRoot .. '/' .. cfg.docSubpage
	end
	local docTitle = mw.title.new(docpage)
	local docExist = docTitle.exists
	local docnameFed = args[1] and true
	local sandbox = docpageRoot .. '/' .. cfg.sandboxSubpage
	local testcases = docpageRoot .. '/' .. cfg.testcasesSubpage
	templatePage = currentTitle.nsText .. ':' .. templatePage

	-- Output from {{documentation/end box}}
	
	-- First, 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 == cfg.linkBoxOff or not (docExist or subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10) then
		return nil
	end

	-- Assemble the arguments for {{fmbox}}.
	local fmargs = {}
	fmargs[cfg.fmboxIdParam] = cfg.fmboxId -- Sets fmargs.id = 'documentation-meta-data'
	fmargs[cfg.fmboxImageParam] = cfg.fmboxImageNone -- Sets fmargs.image = 'none'
	fmargs[cfg.fmboxStyleParam] = cfg.fmboxStyle -- Sets fmargs.style = 'background-color: #ecfcf4'
	fmargs[cfg.fmboxTextstyleParam] = cfg.fmboxTextstyle -- Sets fmargs.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
		if docExist then
			-- /doc exists; link to it.
			local docLink = makeWikilink(docpage)
			local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, cfg.editLinkDisplay)
			local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, cfg.historyLinkDisplay)
			text = text .. formatMessage('transcludedFromBlurb', {docLink}) .. ' ' .. makeToolbar(editLink, historyLink) .. '<br />'
		elseif subjectSpace == 828 then
			-- /doc does not exist; ask to create it.
			local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = cfg.modulePreload}, cfg.createLinkDisplay)
			text = text .. formatMessage('createModuleDocBlurb', {createLink}) .. '<br />'
		end
		-- 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. 
			local sandboxLinks, testcasesLinks
			local pagePossessive = subjectSpace == 828 and cfg.modulePossessive or cfg.templatePossessive
			local sandboxTitle = mw.title.new(sandbox)
			if sandboxTitle.exists then
				local sandboxLink = makeWikilink(sandbox, cfg.sandboxLinkDisplay)
				local sandboxEditLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit'}, cfg.sandboxEditLinkDisplay)
				local compareLink = makeUrlLink(mw.title.new('Special:ComparePages'):fullUrl{page1 = templatePage, page2 = sandbox}, cfg.compareLinkDisplay)
				sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
			else
				local sandboxPreload = subjectSpace == 828 and cfg.moduleSandboxPreload or cfg.templateSandboxPreload
				local sandboxCreateLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}, cfg.sandboxCreateLinkDisplay)
				local mirrorSummary = formatMessage('mirrorEditSummary', {makeWikilink(templatePage)})
				local mirrorLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit', preload = templatePage, summary = mirrorSummary}, cfg.mirrorLinkDisplay)
				sandboxLinks = cfg.sandboxLinkDisplay .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
			end
			local testcaseTitle = mw.title.new(testcases)
			if testcaseTitle.exists then
				local testcasesLink = makeWikilink(testcases, cfg.testcasesLinkDisplay)
				local testcasesEditLink = makeUrlLink(testcaseTitle:fullUrl{action = 'edit'}, cfg.testcasesEditLinkDisplay)
				testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
			else
				local testcasesPreload = subjectSpace == 828 and cfg.moduleTestcasesPreload or cfg.templateTestcasesPreload
				local testcasesCreateLink = makeUrlLink(testcaseTitle:fullUrl{action = 'edit', preload = testcasesPreload}, cfg.testcasesCreateLinkDisplay)
				testcasesLinks = cfg.testcasesLinkDisplay .. ' ' .. makeToolbar(testcasesCreateLink)
			end
			text = text .. formatMessage('experimentBlurb', {pagePossessive, sandboxLinks, testcasesLinks}) .. '<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
				local docPathLink = makeWikilink(docpage, cfg.docLinkDisplay)
				text = text .. formatMessage('addCategoriesBlurb', {docPathLink})
			end
			-- Show the "subpages" link.
			if subjectSpace ~= 6 then -- Don't show the link in file space.
				local pagetype
				if subjectSpace == 10 then
					pagetype = cfg.templatePagetype
				elseif subjectSpace == 828 then
					pagetype = cfg.modulePagetype
				else
					pagetype = cfg.defaultPagetype
				end
				text = text .. ' ' .. makeWikilink('Special:PrefixIndex/' .. templatePage .. '/', formatMessage('subpagesLinkDisplay', {pagetype}))
			end
			-- Show the "print" link if it exists.
			local printPage = templatePage .. '/' .. cfg.printSubpage
			local printTitle = mw.title.new(printPage)
			if printTitle.exists then
				local printLink = makeWikilink(printPage, cfg.printLinkDisplay)
				text = text .. '<br />' .. formatMessage('printBlurb', {printLink})
					.. (cfg.displayPrintCategory and makeCategoryLink(cfg.printCategory) or '')
			end
		end
	end
	fmargs.text = text

	-- Return the fmbox output.
	return messageBox.main('fmbox', fmargs)
end

function p.addTrackingCategories()
	-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
	local ret = ''
	local subpage = currentTitle.subpageText
	if cfg.displayStrangeUsageCategory and (subpage == cfg.docSubpage or subpage == cfg.testcasesSubpage) then
		local sort = (currentTitle.namespace == 0 and cfg.strangeUsageCategoryMainspaceSort or '') .. currentTitle.prefixedText -- Sort on namespace.
		ret = ret .. makeCategoryLink(cfg.strangeUsageCategory, sort)
	end
	return ret
end

function p.docspace()
	-- Determines the namespace of the documentation.
	if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
		-- Pages in the Article, File, MediaWiki or Category namespaces must have their
		-- /doc, /sandbox and /testcases pages in talk space.
		return mw.site.namespaces[subjectSpace].talk.name 
	else
		return currentTitle.subjectNsText
	end
end

function p.templatePage()
	-- Determines the template page. No namespace or interwiki prefixes are included.
	local subpage = currentTitle.subpageText
	if subpage == cfg.sandboxSubpage or subpage == cfg.testcasesSubpage then
		return currentTitle.baseText
	else
		return currentTitle.text
	end
end

return p