Module:Portal
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Documentation for this module may be created at Module:Portal/doc
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--[==[ This module is a Lua implementation of the old {{Portal}} template. As of February 2019 it is used on nearly 7,900,000 articles. -- Please take care when updating it! It outputs two functions: p.portal, which generates a list of portals, and p.image, which -- produces the image name for an individual portal. -- The portal image data is kept in submodules of [[Module:Portal/images]], listed below: -- [[Module:Portal/images/a]] - for portal names beginning with "A". -- [[Module:Portal/images/b]] - for portal names beginning with "B". -- [[Module:Portal/images/c]] - for portal names beginning with "C". -- [[Module:Portal/images/d]] - for portal names beginning with "D". -- [[Module:Portal/images/e]] - for portal names beginning with "E". -- [[Module:Portal/images/f]] - for portal names beginning with "F". -- [[Module:Portal/images/g]] - for portal names beginning with "G". -- [[Module:Portal/images/h]] - for portal names beginning with "H". -- [[Module:Portal/images/i]] - for portal names beginning with "I". -- [[Module:Portal/images/j]] - for portal names beginning with "J". -- [[Module:Portal/images/k]] - for portal names beginning with "K". -- [[Module:Portal/images/l]] - for portal names beginning with "L". -- [[Module:Portal/images/m]] - for portal names beginning with "M". -- [[Module:Portal/images/n]] - for portal names beginning with "N". -- [[Module:Portal/images/o]] - for portal names beginning with "O". -- [[Module:Portal/images/p]] - for portal names beginning with "P". -- [[Module:Portal/images/q]] - for portal names beginning with "Q". -- [[Module:Portal/images/r]] - for portal names beginning with "R". -- [[Module:Portal/images/s]] - for portal names beginning with "S". -- [[Module:Portal/images/t]] - for portal names beginning with "T". -- [[Module:Portal/images/u]] - for portal names beginning with "U". -- [[Module:Portal/images/v]] - for portal names beginning with "V". -- [[Module:Portal/images/w]] - for portal names beginning with "W". -- [[Module:Portal/images/x]] - for portal names beginning with "X". -- [[Module:Portal/images/y]] - for portal names beginning with "Y". -- [[Module:Portal/images/z]] - for portal names beginning with "Z". -- [[Module:Portal/images/other]] - for portal names beginning with any other letters. This includes numbers, -- letters with diacritics, and letters in non-Latin alphabets. -- [[Module:Portal/images/aliases]] - for adding aliases for existing portal names. Use this page for variations -- in spelling and diacritics, etc., no matter what letter the portal begins with. -- -- The images data pages are separated by the first letter to reduce server load when images are added, changed, or removed. -- Previously all the images were on one data page at [[Module:Portal/images]], but this had the disadvantage that all -- 5,000,000 pages using this module needed to be refreshed every time an image was added or removed. ]==] local p = {} -- IMPORTANT: isSandbox should be different between Module:Portal and Module:Portal/sandbox -- That should be the only difference between the main and sandbox version local isSandbox = false local templatestyles = 'Module:Portal/'..(isSandbox and 'sandbox/' or '')..'styles.css' local getArgs = require('Module:Arguments').getArgs local yesno = require('Module:Yesno') -- List of non-talk namespaces which should not be tracked (Talk pages are never tracked) local badNamespaces = {'user','template','draft','wikipedia'} -- Check whether to do tracking in this namespace -- Returns true unless the page is one of the banned namespaces local function checkTracking(title) local thisPage = title or mw.title.getCurrentTitle() if thisPage.isTalkPage then return false end local ns = thisPage.nsText:lower() for _, v in ipairs(badNamespaces) do if ns == v then return false end end return true end local function matchImagePage(s) -- Finds the appropriate image subpage given a lower-case -- portal name plus the first letter of that portal name. if type(s) ~= 'string' or #s < 1 then return end local firstLetter = mw.ustring.sub(s, 1, 1) local imagePage if mw.ustring.find(firstLetter, '^[a-z]') then imagePage = 'Module:Portal/images/' .. firstLetter .. (isSandbox and '/sandbox' or '') else imagePage = 'Module:Portal/images/other' .. (isSandbox and '/sandbox' or '') end return mw.loadData(imagePage)[s] end local function getAlias(s) -- Gets an alias from the image alias data page. local aliasData = mw.loadData('Module:Portal/images/aliases'..(isSandbox and '/sandbox' or '')) for portal, aliases in pairs(aliasData) do for _, alias in ipairs(aliases) do if alias == s then return portal end end end end local function getImageName(s) -- Gets the image name for a given string. local default = 'Portal-puzzle.svg|link=|alt=' if type(s) ~= 'string' or #s < 1 then return default end s = mw.ustring.lower(s) return matchImagePage(s) or matchImagePage(getAlias(s)) or default end -- Function to check argument portals for errors, generate tracking categories if needed -- Function first checks for too few/many portals provided -- Then checks the portal list to purge any portals that don't exist -- Arguments: -- portals: raw list of portals -- args.tracking: is tracking requested? (will not track on bad titles or namespaces) -- args.redlinks: should redlinks be displayed? -- args.minPortals: minimum number of portal arguments -- args.maxPortals: maximum number of portal arguments -- Returns: -- portals = list of portals, with redlinks purged (if args.redlinks=false) -- trackingCat = possible tracking category -- errorMsg = error message function p._checkPortals(portals, args) local trackingCat = '' local errMsg = nil -- Tracking is on by default. -- It is disabled if any of the following is true -- 1/ the parameter "tracking" is set to 'no, 'n', or 'false' -- 2/ the current page fails the namespace or pagename tests local trackingEnabled = args.tracking and checkTracking() args.minPortals = args.minPortals or 1 args.maxPortals = args.maxPortals or -1 -- check for too few portals if #portals < args.minPortals then errMsg = 'please specify at least '..args.minPortals..' portal'..(args.minPortals > 1 and 's' or '') trackingCat = (trackingEnabled and '[[Category:Portal templates with too few portals]]' or '') return portals, trackingCat, errMsg end -- check for too many portals if args.maxPortals >= 0 and #portals > args.maxPortals then errMsg = 'too many portals (maximum = '..args.maxPortals..')' trackingCat = (trackingEnabled and '[[Category:Portal templates with too many portals]]' or '') return portals, trackingCat, errMsg end if not args.redlinks or trackingEnabled then -- make new list of portals that exist local existingPortals = {} for _, portal in ipairs(portals) do local portalTitle = mw.title.new(portal,"Portal") -- if portal exists, put it into list if portalTitle and portalTitle.exists then table.insert(existingPortals,portal) -- otherwise set tracking cat elseif trackingEnabled then trackingCat = "[[Category:Portal templates with redlinked portals]]" end end -- If redlinks is off, use portal list purged of redlinks portals = args.redlinks and portals or existingPortals -- if nothing left after purge, set tracking cat if #portals == 0 then trackingCat = trackingCat..(trackingEnabled and "[[Category:Pages with empty portal template]]" or "") end end return portals, trackingCat, errMsg end function p._portal(portals, args) -- This function builds the portal box used by the {{portal}} template. -- Normalize all arguments if args.redlinks == 'include' then args.redlinks = true end args.addBreak = args['break'] for key, default in pairs({left=false,tracking=true,nominimum=false,redlinks=false,addBreak=false}) do if args[key] == nil then args[key] = default end args[key] = yesno(args[key], default) end local root = mw.html.create('div') :attr('role', 'navigation') :attr('aria-label', 'Portals') :addClass('noprint portalbox plainlist') :addClass(args.left and 'tleft' or 'tright') :css('margin', args.margin or nil) :newline() local trackingCat = '' local errMsg = nil args.minPortals = args.nominimum and 0 or 1 args.maxPortals = -1 portals, trackingCat, errMsg = p._checkPortals(portals, args) root:wikitext(trackingCat) -- if error message, put it in the box and return if errMsg then local errTag = root:tag('strong') errTag:addClass('error') errTag:css('padding','0.2em') errTag:wikitext('Error: '..errMsg) return tostring(root) end -- if no portals (and no error), just return tracking category if #portals == 0 then return trackingCat end -- Start the list. This corresponds to the start of the wikitext table in the old [[Template:Portal]]. local listroot = root:tag('ul') :css('width', (tonumber(args.boxsize) or 0) > 0 and (args.boxsize .. 'px') or args.boxsize) -- Display the portals specified in the positional arguments. for _, portal in ipairs(portals) do local image = getImageName(portal) -- Generate the html for the image and the portal name. listroot :newline() :tag('li') :tag('span') :wikitext(string.format('[[File:%s|32x28px|class=noviewer]]', image)) :done() :tag('span') :wikitext(string.format('[[Portal:%s|%s%sportal]]', portal, portal, args.addBreak and '<br />' or ' ')) end return tostring(root) end function p._image(portals) -- Wrapper function to allow getImageName() to be accessed through #invoke. local name = getImageName(portals[1]) return name:match('^(.-)|') or name -- FIXME: use a more elegant way to separate borders etc. from the image name end local function getAllImageTables() -- Returns an array containing all image subpages (minus aliases) as loaded by mw.loadData. local images = {} for i, subpage in ipairs{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'other'} do images[i] = mw.loadData('Module:Portal/images/' .. subpage .. (isSandbox and '/sandbox' or '')) end return images end function p._displayAll(portals, args) -- This function displays all portals that have portal images. This function is for maintenance purposes and should not be used in -- articles, for two reasons: 1) there are over 1500 portals with portal images, and 2) the module doesn't record how the portal -- names are capitalized, so the portal links may be broken. local lang = mw.language.getContentLanguage() local count = 1 for _, imageTable in ipairs(getAllImageTables()) do for portal in pairs(imageTable) do portals[count] = lang:ucfirst(portal) count = count + 1 end end return p._portal(portals, args) end function p._imageDupes() -- This function searches the image subpages to find duplicate images. If duplicate images exist, it is not necessarily a bad thing, -- as different portals might just happen to choose the same image. However, this function is helpful in identifying images that -- should be moved to a portal alias for ease of maintenance. local exists, dupes = {}, {} for _, imageTable in ipairs(getAllImageTables()) do for portal, image in pairs(imageTable) do if not exists[image] then exists[image] = portal else table.insert(dupes, string.format('The image "[[:File:%s|%s]]" is used for both portals "%s" and "%s".', image, image, exists[image], portal)) end end end if #dupes < 1 then return 'No duplicate images found.' else return 'The following duplicate images were found:\n* ' .. table.concat(dupes, '\n* ') end end local function processPortalArgs(args) -- This function processes a table of arguments and returns two tables: an array of portal names for processing by ipairs, and a table of -- the named arguments that specify style options, etc. We need to use ipairs because we want to list all the portals in the order -- they were passed to the template, but we also want to be able to deal with positional arguments passed explicitly, for example -- {{portal|2=Politics}}. The behaviour of ipairs is undefined if nil values are present, so we need to make sure they are all removed. args = type(args) == 'table' and args or {} local portals = {} local namedArgs = {} for k, v in pairs(args) do if type(k) == 'number' and type(v) == 'string' then -- Make sure we have no non-string portal names. table.insert(portals, k) elseif type(k) ~= 'number' then namedArgs[k] = v end end table.sort(portals) for i, v in ipairs(portals) do portals[i] = args[v] end return portals, namedArgs end -- Entry point for sorting portals from other named arguments function p._processPortalArgs(args) return processPortalArgs(args) end local function makeWrapper(funcName) -- Processes external arguments and sends them to the other functions. return function (frame) -- If called via #invoke, use the args passed into the invoking -- template, or the args passed to #invoke if any exist. Otherwise -- assume args are being passed directly in from the debug console -- or from another Lua module. -- Also: trim whitespace and remove blank arguments local origArgs = getArgs(frame) -- create two tables to pass to func: an array of portal names, and a table of named arguments. local portals, args = processPortalArgs(origArgs) local results = '' if funcName == '_portal' or funcName == '_displayAll' then results = frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} } end return results .. p[funcName](portals, args) end end for _, funcName in ipairs{'portal', 'image', 'imageDupes', 'displayAll'} do p[funcName] = makeWrapper('_' .. funcName) end return p