let find_files root =
let dirs = Queue.create () in
let files = Queue.create () in
- Queue.add root dirs;
let explore parent =
Array.iter (Sys.readdir parent) ~f:(fun child ->
let path = Filename.concat parent child in
()
)
in
- let next_dir () =
- match Queue.take dirs with
- | exception Queue.Empty ->
- ()
- | dir ->
- explore dir
+ explore root;
+ let rec next () =
+ match Queue.is_empty files, Queue.is_empty dirs with
+ | false, _ -> Some (Queue.take files)
+ | true , true -> None
+ | true , false ->
+ explore (Queue.take dirs);
+ next ()
in
- let next_file () =
- match Queue.take files with
- | exception Queue.Empty ->
- None
- | file_path ->
- Some file_path
- in
- Stream.create (fun () ->
- next_dir ();
- next_file ()
- )
+ Stream.create next
end
type input =
let () =
let input = ref Paths_on_stdin in
- Arg.parse [] (fun path -> input := Root_path path) "";
+ Arg.parse [] (fun path ->
+ if Sys.file_exists path then
+ input := Root_path path
+ else begin
+ eprintf "File does not exist: %S\n%!" path;
+ exit 1
+ end
+ ) "";
main !input