Module:Redirect

-- Given a single page name determines what page it redirects to and returns the target page name, or the -- passed page name when not a redirect. The passed page name can be given as plain text or as a page link. -- Returns page name as plain text, or when the bracket parameter is given, as a page link. Returns an -- error message when page does not exist or the redirect target cannot be determined for some reason.

-- Thus these are roughly the same: -- and

p={}

function p.main(frame) local args, pargs = frame.args, (frame:getParent or {}).args or {} local rname, bracket = args[1] or pargs[1], args.bracket or pargs.bracket if not rname or not mw.ustring.match(rname, "%S") then return "" end bracket = bracket and "%s" or "%s" rname = mw.ustring.match(rname,"%[%[(.+)%]%]") or rname local rpage, err = mw.title.new(rname) -- avoid expensive operation when nothing to do   if not rpage then err = "File not found (mw.title.new failed)" elseif rpage.id == 0 then err = "File not found (id=0):" elseif not rpage.isRedirect then return mw.ustring.format(bracket, rname) -- not a redirect so use passed page name (for some general-purpose template use) else local redirect = mw.ustring.match( rpage:getContent or "", "^#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*%[%[(.-)%]%]" ) if redirect then return mw.ustring.format(bracket, redirect) end err = "failed to understand" end return ' Module:redirect error: ' .. err .. ' - ' .. rname .. ' ' end

return p