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part13/ElmHub.elm

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+module ElmHub (..) where
+
+import Html exposing (..)
+import Html.Attributes exposing (..)
+import Html.Events exposing (..)
+import Html.Lazy exposing (..)
+import Http
+import Auth
+import Task exposing (Task)
+import Effects exposing (Effects)
+import Json.Decode exposing (Decoder, (:=))
+import Json.Encode
+import Signal exposing (Address)
+import Dict exposing (Dict)
+import SearchResult
+
+
+searchFeed : String -> Task x Action
+searchFeed query =
+  let
+    -- See https://developer.github.com/v3/search/#example for how to customize!
+    url =
+      "https://api.github.com/search/repositories?access_token="
+        ++ Auth.token
+        ++ "&q="
+        ++ query
+        ++ "+language:elm&sort=stars&order=desc"
+
+    task =
+      Http.get responseDecoder url
+        |> Task.map SetResults
+  in
+    Task.onError task (\_ -> Task.succeed (SetResults []))
+
+
+responseDecoder : Decoder (List SearchResult.Model)
+responseDecoder =
+  "items" := Json.Decode.list SearchResult.decoder
+
+
+type alias Model =
+  { query : String
+  , results : Dict SearchResult.ResultId SearchResult.Model
+  }
+
+
+initialModel : Model
+initialModel =
+  { query = "tutorial"
+  , results = Dict.empty
+  }
+
+
+view : Address Action -> Model -> Html
+view address model =
+  div
+    [ class "content" ]
+    [ header
+        []
+        [ h1 [] [ text "ElmHub" ]
+        , span [ class "tagline" ] [ text "“Like GitHub, but for Elm things.”" ]
+        ]
+    , input [ class "search-query", onInput address SetQuery, defaultValue model.query ] []
+    , button [ class "search-button", onClick address Search ] [ text "Search" ]
+    , ul
+        [ class "results" ]
+        (viewSearchResults address model.results)
+    ]
+
+
+viewSearchResults : Address Action -> Dict SearchResult.ResultId SearchResult.Model -> List Html
+viewSearchResults address results =
+  results
+    |> Dict.values
+    |> List.sortBy (.stars >> negate)
+    |> filterResults
+    |> List.map (lazy3 SearchResult.view address DeleteById)
+
+
+filterResults : List SearchResult.Model -> List SearchResult.Model
+filterResults results =
+  case results of
+    [] ->
+      []
+
+    result :: rest ->
+      if result.stars > 0 then
+        result :: (filterResults rest)
+      else
+        filterResults rest
+
+
+onInput address wrap =
+  on "input" targetValue (\val -> Signal.message address (wrap val))
+
+
+defaultValue str =
+  property "defaultValue" (Json.Encode.string str)
+
+
+type Action
+  = Search
+  | SetQuery String
+  | DeleteById SearchResult.ResultId
+  | SetResults (List SearchResult.Model)
+
+
+update : Action -> Model -> ( Model, Effects Action )
+update action model =
+  case action of
+    Search ->
+      ( model, Effects.task (searchFeed model.query) )
+
+    SetQuery query ->
+      ( { model | query = query }, Effects.none )
+
+    SetResults results ->
+      let
+        resultsById : Dict SearchResult.ResultId SearchResult.Model
+        resultsById =
+          results
+            |> List.map (\result -> ( result.id, result ))
+            |> Dict.fromList
+      in
+        ( { model | results = resultsById }, Effects.none )
+
+    DeleteById id ->
+      let
+        newModel =
+          { model | results = Dict.remove id model.results }
+      in
+        ( newModel, Effects.none )