Shell: add Time.{Map,Set,Table}

src/utils/time.ml

@@ -10,11 +10,23 @@
 open Error_monad
 open CalendarLib
 
-type t = int64
+module T = struct
+  include Int64
 
-let compare = Int64.compare
+  let diff a b =
-let (=) x y = compare x y = 0
+    let sign = a >= b in
-let equal = (=)
+    let res = Int64.sub a b in
+    let res_sign = res >= 0L in
+    if sign = res_sign then res else invalid_arg "Time.diff" ;;
+
+  let add a d =
+    let sign = d >= 0L in
+    let res = Int64.add a d in
+    let incr_sign = res >= a in
+    if sign = incr_sign then res else invalid_arg "Time.add" ;;
+
+  let hash = to_int
+  let (=) = equal
   let (<>) x y = compare x y <> 0
   let (<) x y = compare x y < 0
   let (<=) x y = compare x y <= 0
@@ -23,8 +35,9 @@ let (>) x y = compare x y > 0
   let min x y = if x <= y then x else y
   let max x y = if x <= y then y else x
 
-let add = Int64.add
+  let min_value = min_int
-let diff = Int64.sub
+  let epoch = 0L
+  let max_value = max_int
 
   let now () = Int64.of_float (Unix.gettimeofday ())
 
@@ -70,7 +83,7 @@ let rfc_encoding =
       "timestamp" @@
     describe
       ~title:
-      "RFC 339 formatted timestamp"
+        "RFC 3339 formatted timestamp"
       ~description:
         "A date in human readble form as specified in RFC 3339." @@
     conv
@@ -113,3 +126,9 @@ let make_timed data = {
   }
 
   let pp_hum ppf t = Format.pp_print_string ppf (to_notation t)
+end
+
+include T
+module Set = Set.Make(T)
+module Map = Map.Make(T)
+module Table = Hashtbl.Make(T)

src/utils/time.mli

@@ -9,6 +9,10 @@
 
 type t
 
+val min_value : t
+val epoch : t
+val max_value : t
+
 val add : t -> int64 -> t
 val diff : t -> t -> int64
 
@@ -46,3 +50,7 @@ type 'a timed_data = {
 val make_timed : 'a -> 'a timed_data
 
 val timed_encoding : 'a Data_encoding.t -> 'a timed_data Data_encoding.t
+
+module Set : Set.S with type elt = t
+module Map : Map.S with type key = t
+module Table : Hashtbl.S with type key = t