+structure SS = StringSet
+
+fun domainList dname =
+ let
+ val dir = Posix.FileSys.opendir dname
+
+ fun visitNode dset =
+ case Posix.FileSys.readdir dir of
+ NONE => dset
+ | SOME node =>
+ let
+ val path = OS.Path.joinDirFile {dir = dname,
+ file = node}
+
+ fun visitDomains (path, bfor, dset) =
+ let
+ val dir = Posix.FileSys.opendir path
+
+ fun loop dset =
+ case Posix.FileSys.readdir dir of
+ NONE => dset
+ | SOME dname =>
+ let
+ val path = OS.Path.joinDirFile {dir = path,
+ file = dname}
+ in
+ if Posix.FileSys.ST.isDir (Posix.FileSys.stat path) then
+ let
+ val bfor = dname :: bfor
+ in
+ loop (visitDomains (path, bfor,
+ SS.add (dset,
+ String.concatWith "." bfor)))
+ end
+ else
+ loop dset
+ end
+ in
+ loop dset
+ before Posix.FileSys.closedir dir
+ end
+ in
+ visitNode (visitDomains (path, [], dset))
+ end
+ in
+ visitNode SS.empty
+ before Posix.FileSys.closedir dir
+ end
+