Module:Namespace detect

-- --                                                                 -- --                        NAMESPACE DETECT                          -- --                                                                 -- --      This module implements the  template    -- --     in Lua, with a few improvements: all namespaces and all     -- --     namespace aliases are supported, and namespace names are    -- --     detected automatically for the local wiki. Function names  -- --     can be configured for different wikis by altering the       -- --     values in the "cfg" table. -- --                                                                 -- --

-- --                     Configuration data                          -- --     Language-specific parameter names can be set here. -- --

local cfg = {}

-- The name for the parameter to display content for the main namespace: cfg.main = 'main'

-- The name for the parameter to display content in talk namespaces: cfg.talk = 'talk'

-- The name for the parameter to display content for "other" namespaces -- (namespaces for which parameters have not been specified, or for when -- cfg.demospace is set to cfg.other): cfg.other = 'other'

-- The name for the parameter to set a demonstration namespace: cfg.demospace = 'demospace'

-- The name for the parameter to set a specific page to compare: cfg.page = 'page'

-- --                    End configuration data                       -- --

-- Specify variables available to the whole module local p = {} local args = {}

-- Get the page object. This will return the page object for the page -- specified, or nil if there are errors in the title or if the -- expensive function count has been exceeded. local function getPageObject -- Get the title object for args.page if it is specified. Otherwise -- get the title object for the current page. if args[cfg.page] then -- Get the page object, passing the function through pcall -- in case we are over the expensive function count limit. local noError, pageObject = pcall(mw.title.new, args[cfg.page]) if not noError then return nil else return pageObject end else return mw.title.getCurrentTitle end end

-- Detects the namespace for a page object. local function detectNamespace(pageObject) if pageObject.isTalkPage then -- Returns the value of cfg.talk or the local "Talk" namespace name. return cfg.talk or mw.site.namespaces[1].name else return pageObject.nsText end end

-- Gets the namespace name to compare to the arguments. The returned value -- is lower-case. local function getNamespace local ret if args[cfg.demospace] then ret = args[cfg.demospace] else local pageObject = getPageObject if pageObject then ret = detectNamespace( getPageObject ) else return nil -- return nil if the page object doesn't exist. end end return mw.ustring.lower(ret) end

-- Compare the namespace found with the parameters that have been -- specified, and return the appropriate parameter. local function compare local namespace = getNamespace -- First, return arguments for mainspace. if namespace == '' and args[cfg.main] then return args[cfg.main] end -- Next, return arguments for non-main namespaces. for nsid, ns in pairs( mw.site.namespaces ) do       local nsname = mw.ustring.lower( ns.name ) -- Check the namespace, and ignore main namespace values. if nsname == namespace and nsname ~= '' then if args[nsname] then return args[nsname] else -- Check alias names. for _, alias in ipairs( ns.aliases ) do                   local aliasArg = args[ mw.ustring.lower( alias ) ] if aliasArg then return aliasArg end end end end end -- Then, return arguments for other namespaces, if the main -- namespace wasn't specified, or if the demospace parameter -- is set to "other". if args[cfg.other] then return args[cfg.other] end end

-- Process the arguments. function p.main(frame) -- If called via #invoke, use the args passed into the invoking template. -- Otherwise, for testing purposes, assume args are being passed directly in. local origArgs if frame == mw.getCurrentFrame then origArgs = frame:getParent.args for k, v in pairs( frame.args ) do           origArgs = frame.args break end else origArgs = frame end -- Remove blank arguments. for k, v in pairs(origArgs) do       if v ~= '' then args[k] = v       end end return compare end

return p