- hExtlib: added debugging information for split_nth

[helm.git] / helm / software / components / extlib / hExtlib.ml

diff --git a/helm/software/components/extlib/hExtlib.ml b/helm/software/components/extlib/hExtlib.ml
index 3ef795e9fca4badc9299cd2a0f4207fe1af2afa5..4a228b232736e916f4960048dfd9d15f0146e8eb 100644 (file)
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -248,6 +248,15 @@ let list_concat ?(sep = []) =
   in
   aux []
   
+let list_iter_sep ~sep f =
+  let rec aux =
+    function
+    | [] -> ()
+    | [ last ] -> f last
+    | hd :: tl -> f hd; sep (); aux tl
+  in
+  aux
+  
 let rec list_findopt f l = 
   let rec aux k = function 
     | [] -> None 
@@ -258,11 +267,11 @@ let rec list_findopt f l =
   in
   aux 0 l
 
-let split_nth n l =
+let split_nth msg n l =
   let rec aux acc n l =
     match n, l with
     | 0, _ -> List.rev acc, l
-    | n, [] -> raise (Failure "HExtlib.split_nth")
+    | n, [] -> raise (Failure ("HExtlib.split_nth: " ^ msg))
     | n, hd :: tl -> aux (hd :: acc) (n - 1) tl in
   aux [] n l
 
@@ -270,7 +279,13 @@ let list_last l =
   let l = List.rev l in 
   try List.hd l with exn -> raise (Failure "HExtlib.list_last")
 ;;
-  
+
+let rec list_assoc_all a = function
+   | []                      -> []
+   | (x, y) :: tl when x = a -> y :: list_assoc_all a tl
+   | _ :: tl                 -> list_assoc_all a tl
+;;
+
 (** {2 File predicates} *)
 
 let is_dir fname =