Module:Commons link

-- Module to find commons galleries and categories based on wikidata entries local getArgs = require('Module:Arguments').getArgs local p = {}

-- Get title, namespace, and QID for current page -- Arguments: --  qid = testing only: get title of alternative page with QID=qid -- Returns: --  title, namespace (number), qid of current page (or test page) local function _getTitleQID(qid) local titleObject = mw.title.getCurrentTitle qid = (qid or ""):upper -- look up qid for current page (if not testing) if qid == "" then qid = mw.wikibase.getEntityIdForCurrentPage return titleObject.text, titleObject.namespace, qid end -- testing-only path: given a qid, determine title -- always use namespace from current page (to suppress tracking cat) local title = mw.wikibase.getSitelink(qid) or "" -- strip any namespace from sitelink local firstColon = mw.ustring.find(title,':',1,true) if firstColon then title = mw.ustring.sub(title,firstColon+1) end return title, titleObject.namespace, qid end

-- Lookup Commons gallery in Wikidata -- Arguments: --  qid = QID of current article --  fetch = whether to lookup Commons sitelink (bool) --  commonsSitelink = default value for Commons sitelink -- Returns: --  categoryLink = name of Commons category, nil if nothing is found --  consistent = multiple wikidata fields are examined: are they consistent? --  commonsSitelink = commons sitelink for current article local function _lookupGallery(qid,fetch,commonsSitelink) local galleryLink = nil local consistent = true -- look up commons sitelink for article, use if not category if fetch then commonsSitelink = mw.wikibase.getSitelink(qid,"commonswiki") or commonsSitelink end if commonsSitelink and mw.ustring.sub(commonsSitelink,1,9) ~= "Category:" then galleryLink = commonsSitelink end -- P935 is the "commons gallery" property for this article local P935 = mw.wikibase.getBestStatements(qid, "P935")[1] if P935 and P935.mainsnak.datavalue then local gallery = P935.mainsnak.datavalue.value if galleryLink and galleryLink ~= gallery then consistent = false else galleryLink = gallery end end return galleryLink, consistent, commonsSitelink end

-- Find fallback category by looking up Commons sitelink of different page -- Arguments: --   qid = QID for current article --   property = property that refers to other article whose sitelink to return -- Returns: either category-stripped name of article, or nil local function _lookupFallback(qid,property) if not qid or not property then return nil end -- If property exists on current article, get value (other article qid) local value = mw.wikibase.getBestStatements(qid, property)[1] if value and value.mainsnak.datavalue and value.mainsnak.datavalue.value.id then -- Look up Commons sitelink of other article local sitelink = mw.wikibase.getSitelink(value.mainsnak.datavalue.value.id,"commonswiki") -- Check to see if it starts with "Category:". If so, strip it and return if sitelink and mw.ustring.sub(sitelink,1,9) == "Category:" then return mw.ustring.sub(sitelink,10) end end return nil end

-- Find Commons category by looking in wikidata -- Arguments: --  qid = QID of current article --  fetch = whether to lookup Commons sitelink (bool) --  commonsSitelink = default value for Commons sitelink -- Returns: --  categoryLink = name of Commons category, nil if nothing is found --  consistent = multiple wikidata fields are examined: are they consistent? --  commonsSitelink = commons sitelink for current article local function _lookupCategory(qid, fetch, commonsSitelink) local categoryLink = nil local consistent = true -- look up commons sitelink for article, use if starts with "Category:" if fetch then commonsSitelink = mw.wikibase.getSitelink(qid,"commonswiki") or commonsSitelink end if commonsSitelink and mw.ustring.sub(commonsSitelink,1,9) == "Category:" then categoryLink = mw.ustring.sub(commonsSitelink,10) end -- P373 is the "commons category" property for this article local P373 = mw.wikibase.getBestStatements(qid, "P373")[1] if P373 and P373.mainsnak.datavalue then P373 = P373.mainsnak.datavalue.value if categoryLink and categoryLink ~= P373 then consistent = false qid = nil -- stop searching on inconsistent data else categoryLink = P373 end end -- P910 is the "topic's main category". Look for commons sitelink there local fallback = _lookupFallback(qid,"P910") if fallback then if categoryLink and categoryLink ~= fallback then consistent = false qid = nil else categoryLink = fallback end end -- P1754 is the "list's main category". Look for commons sitelink there fallback = _lookupFallback(qid,"P1754") if fallback then if categoryLink and categoryLink ~= fallback then consistent = false else categoryLink = fallback end end return categoryLink, consistent, commonsSitelink end

-- Create Commons link corresponding to current article -- Arguments: --  namespace = namespace in Commons ("" for galleries) --  default = use as Commons link, don't access wikidata --  linktext = text to display in link --  search = string to search for --  qid = QID to lookup in wikidata (for testing only) -- Returns: --  formatted wikilink to Commons in specified namespace function p._getCommons(namespace,default,linktext,search,qid) local nsColon if not namespace or namespace == "" then nsColon = "" else nsColon = namespace..":" end if default then return ""..(linktext or default).."" end if search then return ""..(linktext or search).."" end local wp_title, wp_ns wp_title, wp_ns, qid = _getTitleQID(qid) -- construct default result (which searches for title) local searchResult = ""..(linktext or wp_title).."" if qid then local commonsLink = nil local consistent = true if nsColon == "" then commonsLink, consistent = _lookupGallery(qid,true) elseif namespace:lower == "category" then commonsLink, consistent = _lookupCategory(qid,true) end -- use wikidata if consistent if commonsLink and consistent then return ""..(linktext or commonsLink).."" end -- if not consistent, fall back to search and add to tracking cat if not consistent and wp_ns == 0 then local friendlyNS if nsColon == "" then friendlyNS = "gallery" else friendlyNS = namespace:lower end searchResult = searchResult.."" end end return searchResult end

-- Returns "best" Commons link: first look for gallery, then try category -- Arguments: --  default = use as Commons link, don't access wikidata --  linktext = text to display in link --  search = string to search for --  qid = QID to lookup in wikidata (for testing only) -- Returns: --  formatted wikilink to Commons "best" landing page function p._getGalleryOrCategory(default,linktext,search,qid) if default then return ""..(linktext or default).."" end if search then return ""..(linktext or search).."" end local wp_title, wp_ns wp_title, wp_ns, qid = _getTitleQID(qid) -- construct default result (which searches for title) local searchResult = ""..(linktext or wp_title).."" local trackingCats = "" if qid then local galleryLink, consistent, commonsSitelink = _lookupGallery(qid,true) -- use wikidata if either sitelink or P935 exist, and they both agree if galleryLink and consistent then return ""..(linktext or galleryLink).."" end if not consistent and wp_ns == 0 then trackingCats = "" end -- if gallery is not good, fall back looking for category local categoryLink categoryLink, consistent = _lookupCategory(qid,false,commonsSitelink) if categoryLink and consistent then return ""..(linktext or categoryLink)..""..trackingCats end if not consistent and wp_ns == 0 then trackingCats = trackingCats.."" end end return searchResult..trackingCats end

-- Testing-only entry point for _getTitleQID function p.getTitleQID(frame) local args = getArgs(frame,{frameOnly=true,parentOnly=false,parentFirst=false}) local text, ns, qid = _getTitleQID(args[1]) return text..","..ns..","..(qid or "nil") end

-- Testing-only entry point for _lookupFallback function p.lookupFallback(frame) local args = getArgs(frame,{frameOnly=true,parentOnly=false,parentFirst=false}) local fallback = _lookupFallback(args[1],args[2]) return fallback or "nil" end

-- Find the Commons gallery page associated with article function p.getGallery(frame) local args = getArgs(frame,{frameOnly=true,parentOnly=false,parentFirst=false}) return p._getCommons("",args[1],args.linktext,args.search,args.qid) end

-- Find the Commons category page associated with article function p.getCategory(frame) local args = getArgs(frame,{frameOnly=true,parentOnly=false,parentFirst=false}) return p._getCommons("Category",args[1],args.linktext,args.search,args.qid) end

function p.getGalleryOrCategory(frame) local args = getArgs(frame,{frameOnly=true,parentOnly=false,parentFirst=false}) return p._getGalleryOrCategory(args[1],args.linktext,args.search,args.qid) end

return p