val iter : 'a t -> f:('a -> unit) -> unit
+ val map : 'a t -> f:('a -> 'b) -> 'b t
+
+ val filter : 'a t -> f:('a -> bool) -> 'a t
+
val concat : ('a t) list -> 'a t
end = struct
module S = Stream
type 'a t =
- ('a S.t) list
+ {mutable streams : ('a S.t) list}
let create f =
- [S.from (fun _ -> f ())]
+ {streams = [S.from (fun _ -> f ())]}
+
+ let rec next t =
+ match t.streams with
+ | [] ->
+ None
+ | s :: streams ->
+ (match S.next s with
+ | exception Stream.Failure ->
+ t.streams <- streams;
+ next t
+ | x ->
+ Some x
+ )
+
+ let map t ~f =
+ create (fun () ->
+ match next t with
+ | None -> None
+ | Some x -> Some (f x)
+ )
+
+ let filter t ~f =
+ let rec filter () =
+ match next t with
+ | None ->
+ None
+ | Some x when f x ->
+ Some x
+ | Some _ ->
+ filter ()
+ in
+ create filter
let iter t ~f =
- List.iter t ~f:(S.iter f)
+ List.iter t.streams ~f:(S.iter f)
let concat ts =
- List.concat ts
+ {streams = List.concat (List.map ts ~f:(fun {streams} -> streams))}
end
module In_channel : sig
)
end
-module Directory_tree : sig
- val find_files : string -> string Stream.t
+module File : sig
+ type t =
+ { path : string
+ ; size : int
+ }
+
+ val find : string -> t Stream.t
+ (** Find all files in the directory tree, starting from the given root path *)
+
+ val lookup : string Stream.t -> t Stream.t
+ (** Lookup file info for given paths *)
end = struct
- let find_files root =
+ type t =
+ { path : string
+ ; size : int
+ }
+
+ let lookup paths =
+ Stream.map paths ~f:(fun path ->
+ let {Unix.st_size = size; _} = Unix.lstat path in
+ {path; size}
+ )
+
+ let find root =
let dirs = Queue.create () in
let files = Queue.create () in
let explore parent =
Array.iter (Sys.readdir parent) ~f:(fun child ->
let path = Filename.concat parent child in
- let {Unix.st_kind = file_kind; _} = Unix.lstat path in
+ let {Unix.st_kind = file_kind; st_size; _} = Unix.lstat path in
match file_kind with
| Unix.S_REG ->
- Queue.add path files
+ let file = {path; size = st_size} in
+ Queue.add file files
| Unix.S_DIR ->
Queue.add path dirs
| Unix.S_CHR
| Stdout
| Directory of string
-let make_input_stream = function
- | Stdin ->
- In_channel.lines stdin
- | Directories paths ->
- let paths = StrSet.elements (StrSet.of_list paths) in
- Stream.concat (List.map paths ~f:Directory_tree.find_files)
+type count =
+ { considered : int ref
+ ; empty : int ref
+ ; ignored : int ref
+ ; unique_size : int ref
+ ; hashed : int ref
+ }
+
+let make_input_stream input ignore count =
+ let input =
+ match input with
+ | Stdin ->
+ File.lookup (In_channel.lines stdin)
+ | Directories paths ->
+ let paths = StrSet.elements (StrSet.of_list paths) in
+ Stream.concat (List.map paths ~f:File.find)
+ in
+ Stream.filter input ~f:(fun {File.path; size} ->
+ incr count.considered;
+ let empty = size = 0 in
+ let ignored =
+ match ignore with
+ | Some regexp when (Str.string_match regexp path 0) ->
+ true
+ | Some _ | None ->
+ false
+ in
+ if empty then incr count.empty;
+ if ignored then incr count.ignored;
+ (not empty) && (not ignored)
+ )
let make_output_fun = function
| Stdout ->
close_out oc
let main input output ignore =
+ let t0 = Sys.time () in
+ let count =
+ { considered = ref 0
+ ; empty = ref 0
+ ; ignored = ref 0
+ ; unique_size = ref 0
+ ; hashed = ref 0
+ }
+ in
let output = make_output_fun output in
- let input = make_input_stream input in
+ let input = make_input_stream input ignore count in
+ let paths_by_size = Hashtbl.create 1_000_000 in
let paths_by_digest = Hashtbl.create 1_000_000 in
- let path_count = ref 0 in
- let t0 = Sys.time () in
- let process path =
- try
- let digest = Digest.file path in
- let count, paths =
- match Hashtbl.find_opt paths_by_digest digest with
- | None ->
- (0, StrSet.empty)
- | Some (n, paths) ->
- (n, paths)
- in
- Hashtbl.replace paths_by_digest digest (count + 1, StrSet.add path paths)
- with Sys_error e ->
- eprintf "WARNING: Failed to process %S: %S\n%!" path e
+ let process tbl path ~f =
+ let key = f path in
+ let count, paths =
+ match Hashtbl.find_opt tbl key with
+ | None ->
+ (0, StrSet.empty)
+ | Some (n, paths) ->
+ (n, paths)
+ in
+ Hashtbl.replace tbl key (count + 1, StrSet.add path paths)
in
- Stream.iter input ~f:(fun path ->
- incr path_count;
- match ignore with
- | Some regexp when (Str.string_match regexp path 0) ->
- ()
- | Some _ | None ->
- process path
+ Stream.iter input ~f:(fun {File.path; size} ->
+ process paths_by_size path ~f:(fun _ -> size)
);
+ Hashtbl.iter
+ (fun _ (n, paths) ->
+ (* Skip files with unique sizes *)
+ if n > 1 then
+ StrSet.iter
+ (fun path ->
+ incr count.hashed;
+ process paths_by_digest path ~f:Digest.file
+ )
+ paths
+ else
+ incr count.unique_size;
+ )
+ paths_by_size;
Hashtbl.iter (fun d (n, ps) -> if n > 1 then output d n ps) paths_by_digest;
let t1 = Sys.time () in
- eprintf "Processed %d files in %f seconds.\n%!" !path_count (t1 -. t0)
+ eprintf "Time : %f seconds\n%!" (t1 -. t0);
+ eprintf "Considered : %d\n%!" !(count.considered);
+ eprintf "Hashed : %d\n%!" !(count.hashed);
+ eprintf "Skipped due to 0 size : %d\n%!" !(count.empty);
+ eprintf "Skipped due to unique size : %d\n%!" !(count.unique_size);
+ eprintf "Ignored due to regex match : %d\n%!" !(count.ignored)
let () =
let input = ref Stdin in
home / code / dups.git / blobdiff