Add init data in html page

1 files changed, 28 insertions, 0 deletions

diff --git a/src/client/elm/Model/InitResult.elm b/src/client/elm/Model/InitResult.elm
new file mode 100644
index 0000000..d1f1348
--- /dev/null
+++ b/src/client/elm/Model/InitResult.elm
@@ -0,0 +1,28 @@
+module Model.InitResult
+  ( InitResult(..)
+  , initResultDecoder
+  ) where
+
+import Json.Decode as Json exposing ((:=))
+
+import Model.Init exposing (Init, initDecoder)
+
+type InitResult =
+  InitEmpty
+  | InitSuccess Init
+  | InitError String
+
+initResultDecoder : Json.Decoder InitResult
+initResultDecoder = ("tag" := Json.string) `Json.andThen` initResultDecoderWithTag
+
+initResultDecoderWithTag : String -> Json.Decoder InitResult
+initResultDecoderWithTag tag =
+  case tag of
+    "InitEmpty" ->
+      Json.succeed InitEmpty
+    "InitSuccess" ->
+      Json.map InitSuccess ("contents" := initDecoder)
+    "InitError" ->
+      Json.map InitError ("contents" := Json.string)
+    _ ->
+      Json.fail <| "got " ++ tag ++ " for InitResult"