Composition of coercions with arity > 0 is now implemented correctly.

[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 d4572789ad55f39795d000fd09192e839cfee02f..d9b24c2eb38d92bd4377bbafcf08d4ab6322700c 100644 (file)
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -164,6 +164,17 @@ let list_rev_map_filter f l =
    in 
    aux [] l
 
+let list_rev_map_filter_fold f v l =
+   let rec aux v a = function
+      | []       -> v, a
+      | hd :: tl -> 
+         begin match f v hd with
+           | v, None   -> aux v a tl
+           | v, Some b -> aux v (b :: a) tl 
+         end
+   in 
+   aux v [] l
+
 let list_concat ?(sep = []) =
   let rec aux acc =
     function
@@ -203,11 +214,28 @@ let is_dir fname =
     (Unix.stat fname).Unix.st_kind = Unix.S_DIR
   with Unix.Unix_error _ -> false
 
+let writable_dir path =
+  try
+    let file = path ^ "/prova_matita" in
+    let oc = open_out file in
+    close_out oc;
+    Sys.remove file;
+    true
+  with Sys_error _ -> false
+
+
 let is_regular fname =
   try
     (Unix.stat fname).Unix.st_kind = Unix.S_REG
   with Unix.Unix_error _ -> false
 
+let is_executable fname =
+  try
+    let stat = (Unix.stat fname) in
+    stat.Unix.st_kind = Unix.S_REG &&
+    (stat.Unix.st_perm land 0o001 > 0)
+  with Unix.Unix_error _ -> false
+
 let mkdir path =
   let components = split ~sep:'/' path in
   let rec aux where = function