4 files changed, 132 insertions, 0 deletions
diff --git a/src/shared/elm/Shared/Util/Array.elm b/src/shared/elm/Shared/Util/Array.elm
new file mode 100644
index 0000000..234b4c4
--- /dev/null
+++ b/src/shared/elm/Shared/Util/Array.elm
@@ -0,0 +1,54 @@
+module Shared.Util.Array exposing
+   (
+      update,
+      update_unsafe,
+      filter_first,
+      indexed_search
+   )
+
+import List
+import Array
+
+update : (
+      Int ->
+      ((Maybe t) -> (Maybe t)) ->
+      (Array.Array t) ->
+      (Array.Array t)
+   )
+update index fun array =
+   case (fun (Array.get index array)) of
+      Nothing -> array
+      (Just e) -> (Array.set index e array)
+
+update_unsafe : (
+      Int ->
+      (t -> t) ->
+      (Array.Array t) ->
+      (Array.Array t)
+   )
+update_unsafe index fun array =
+   case (Array.get index array) of
+      Nothing -> array
+      (Just e) -> (Array.set index (fun e) array)
+
+filter_first : (t -> Bool) -> (Array.Array t) -> (Maybe t)
+filter_first fun array =
+   (Array.get 0 (Array.filter fun array))
+
+indexed_search : (t -> Bool) -> (Array.Array t) -> (Maybe (Int, t))
+indexed_search fun array =
+   (List.foldl
+      (\v res ->
+         (
+            case res of
+               (Just e) -> res
+               Nothing ->
+                  let (index, value) = v in
+                     if (fun value)
+                     then (Just v)
+                     else Nothing
+         )
+      )
+      Nothing
+      (Array.toIndexedList array)
+   )
diff --git a/src/shared/elm/Shared/Util/Html.elm b/src/shared/elm/Shared/Util/Html.elm
new file mode 100644
index 0000000..8b803f7
--- /dev/null
+++ b/src/shared/elm/Shared/Util/Html.elm
@@ -0,0 +1,6 @@
+module Shared.Util.Html exposing (nothing)
+
+import Html
+
+nothing : (Html.Html a)
+nothing = (Html.text "")
diff --git a/src/shared/elm/Shared/Util/Http.elm b/src/shared/elm/Shared/Util/Http.elm
new file mode 100644
index 0000000..2e57819
--- /dev/null
+++ b/src/shared/elm/Shared/Util/Http.elm
@@ -0,0 +1,22 @@
+module Shared.Util.Http exposing (error_to_string)
+
+import Http
+
+error_to_string : Http.Error -> String
+error_to_string error =
+   case error of
+      (Http.BadUrl string) -> ("Invalid URL: \"" ++ string ++ "\"")
+      Http.Timeout -> "Timed out"
+      Http.NetworkError -> "Connection lost, network error."
+      (Http.BadStatus response) ->
+         (
+            "The HTTP request failed: "
+            ++ (String.fromInt response)
+            ++ "."
+         )
+      (Http.BadBody string) ->
+         (
+            "Server response not understood:\""
+            ++ string
+            ++ "\"."
+         )
diff --git a/src/shared/elm/Shared/Util/List.elm b/src/shared/elm/Shared/Util/List.elm
new file mode 100644
index 0000000..6a22a5a
--- /dev/null
+++ b/src/shared/elm/Shared/Util/List.elm
@@ -0,0 +1,50 @@
+module Shared.Util.List exposing (..)
+
+import Set
+
+import List
+
+pop : List a -> (Maybe (a, List a))
+pop l =
+   case l of
+      (head :: tail) -> (Just (head, tail))
+      [] -> Nothing
+
+get_first : (a -> Bool) -> (List a) -> (Maybe a)
+get_first fun list =
+   (List.head (List.filter fun list))
+
+product_map : (a -> b -> c) -> (List a) -> (List b) -> (List c)
+product_map product_fun list_a list_b =
+   (product_map_rec (product_fun) list_a list_b [])
+
+product_map_rec : (a -> b -> c) -> (List a) -> (List b) -> (List c) -> (List c)
+product_map_rec product_fun list_a list_b result =
+   case (pop list_a) of
+      Nothing -> result
+      (Just (head, tail)) ->
+         (product_map_rec
+            (product_fun)
+            tail
+            list_b
+            (List.append
+               (List.map (product_fun head) list_b)
+               result
+            )
+         )
+
+duplicates : (List comparable) -> (Set.Set comparable)
+duplicates list =
+   let
+      (encountered, final_result) =
+         (List.foldl
+            (\elem (met, result) ->
+               if (Set.member elem met)
+               then (met, (Set.insert elem result))
+               else ((Set.insert elem met), result)
+            )
+            ((Set.empty), (Set.empty))
+            list
+         )
+   in
+      final_result