Module:UserLinks/shared

-- This module stores functions that are shared between Module:UserLinks -- and Module:UserLinks/extra.

-- Load data and define often-used variables local cfg = mw.loadData('Module:UserLinks/config') local namespaces = mw.site.namespaces

-- Lazily initialise modules that we may or may not need local mCategoryHandler

-- Define namespaces for which links need to be escaped with the colon trick. -- See w:en:Help:Colon trick. local colonNamespaces = { [6] = true, -- File [14] = true, -- Category }

local p = {}

function p.maybeLoadModule(s) -- Attempts to load the module s. If it succeeds, returns the module; -- otherwise, returns false. local success, mdl = pcall(require, s)	if success then return mdl else return false end end

function p.raiseError(message, section, level) -- Raises an error using the Lua error function. The error message is -- designed to be caught with pcall and then passed to p.makeWikitextError. -- The section, if specified, is the section name on a help page that gives -- help to users about that particular error. if section then message = message .. '|' .. section end if not level or level == 0 then level = 0 else level = level + 1 end error(message, level) end

function p.makeWikitextError(encodedMessage, demo) local errorMessage, section = mw.ustring.match(encodedMessage, '^(.-)|(.*)$') errorMessage = errorMessage or encodedMessage -- If not a demo, get the error category link and pass it through -- Module:Category handler's blacklist. local category if not demo then category = string.format(			'%s:%s',			namespaces[14].name,			p.message('error-config-category')		) mCategoryHandler = p.maybeLoadModule('Module:Category handler') if mCategoryHandler then -- Categorise all namespaces, but not blacklisted pages. category = mCategoryHandler.main{all = category} end end category = category or '' -- Format the error message and the section link. local formattedError if section then formattedError = p.message(			'error-config-message-help',			errorMessage,			section		) else formattedError = p.message(			'error-config-message-nohelp',			errorMessage		) end

-- Return the error message and the category inside html error tags. return string.format(		' %s %s',		formattedError,		category	) end

local function formatPage(interwiki, namespace, page) -- Formats an interwiki, a namespace and a page into a wikilink-ready -- string. The interwiki and namespace are optional. If a namespace is -- specified, it should be a valid key to mw.site.namespaces. The page -- parameter is required. local ret = {} interwiki = interwiki or '' if interwiki ~= '' or colonNamespaces[namespace] then ret[#ret + 1] = ':' end ret[#ret + 1] = interwiki if interwiki ~= '' then ret[#ret + 1] = ':' end if namespace then local nsTable = namespaces[namespace] if not nsTable then error('"' .. tostring(namespace) .. '" is not a valid namespace key', 2) end ret[#ret + 1] = nsTable.name if namespace ~= 0 then ret[#ret + 1] = ':' end end ret[#ret + 1] = page return table.concat(ret) end

local function formatDisplay(s) -- Replaces spaces in a string with " " to make sure they don't wrap. -- Don't replace anything if we are substing, as we generally don't want -- to use " " in that case. if mw.isSubsting then return s	else return s:gsub(' ', ' ') end end

function p.makeWikilink(interwiki, namespace, page, display) -- Creates a wikilink. The interwiki, namespace and display parameters are -- optional. If a namespace parameter is specified it must be a valid key -- to mw.site.namespaces. local formattedPage = formatPage(interwiki, namespace, page) if display then display = formatDisplay(display) return string.format('%s', formattedPage, display) else return string.format('%s', formattedPage) end end

local function formatUrlLink(url, display) -- Formats a URL link with an optional display parameter. if display then display = formatDisplay(display) return string.format('[%s %s]', url, display) else return string.format('[%s]', url) end end

function p.makeUrlLink(s, display) -- Makes a URL link with an optional display parameter. The first input -- may be any valid input to mw.uri.new. local url = mw.uri.new(s) url = tostring(url) return formatUrlLink(url, display) end

function p.makeFullUrlLink(interwiki, namespace, page, query, display) -- Makes a link to the full URL of a page. The interwiki, namespace, query -- and display parameters are optional. If a namespace parameter is -- specified it must be a valid key to mw.site.namespaces. The query -- parameter can be a string or a table as specified in the mw.uri library. local formattedPage = formatPage(interwiki, namespace, page) local url = mw.uri.fullUrl(formattedPage, query) url = tostring(url) return formatUrlLink(url, display) end

function p.message(key, ...) -- Returns the message with the given key from Module:UserLinks/config. -- Extra parameters are substituted in the message for keys $1, $2, $3, etc.	local msg = cfg[key] if not msg then p.raiseError(			'No message found with key "' .. tostring(key) .. '"',			'No message found',			2		) end local noArgs = select('#', ...) if noArgs < 1 then return msg else local msg = mw.message.newRawMessage(msg, ...) return msg:plain end end

return p