Support boilerplate for Elm clients

Lately I was toiling while writing a ClojureScript client. This made me crave
Elm. I'm going to rewrite the ClojureScript client using Elm, but along the way,
I'm stopping off here and recording my starter boilerplate.

boilerplate/elm/src/Landing.elm

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+module Landing exposing (render)
+
+import Html exposing (..)
+import Html.Attributes exposing (..)
+import Html.Events exposing (..)
+import State
+
+
+render : State.Model -> Html State.Msg
+render model =
+    div [ class "pt-10 pb-20 px-10" ]
+        [ p [] [ text "Welcome to the landing page!" ]
+        ]

boilerplate/elm/src/Login.elm

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+module Login exposing (render)
+
+import Html exposing (..)
+import Html.Attributes exposing (..)
+import Html.Events exposing (..)
+import State
+
+
+render : State.Model -> Html State.Msg
+render model =
+    div [ class "pt-10 pb-20 px-10" ]
+        [ p [] [ text "Please authenticate" ]
+        ]

boilerplate/elm/src/Main.elm

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+module Main exposing (main)
+
+import Browser
+import Html exposing (..)
+import Landing
+import Login
+import State
+
+
+subscriptions : State.Model -> Sub State.Msg
+subscriptions model =
+    Sub.none
+
+
+view : State.Model -> Html State.Msg
+view model =
+    case model.view of
+        State.Landing ->
+            Landing.render model
+
+        State.Login ->
+            Login.render model
+
+
+main =
+    Browser.element
+        { init = \() -> ( State.init, Cmd.none )
+        , subscriptions = subscriptions
+        , update = State.update
+        , view = view
+        }

boilerplate/elm/src/State.elm

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+module State exposing (..)
+
+
+type Msg
+    = DoNothing
+    | SetView View
+
+
+type View
+    = Landing
+    | Login
+
+
+type alias Model =
+    { isLoading : Bool
+    , view : View
+    }
+
+
+{-| The initial state for the application.
+-}
+init : Model
+init =
+    { isLoading = False
+    , view = Landing
+    }
+
+
+{-| Now that we have state, we need a function to change the state.
+-}
+update : Msg -> Model -> ( Model, Cmd Msg )
+update msg model =
+    case msg of
+        DoNothing ->
+            ( model, Cmd.none )
+
+        SetView x ->
+            ( { model
+                | view = x
+                , isLoading = True
+              }
+            , Cmd.none
+            )