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|
module Main exposing (..)
import Html exposing (Html, text, div, span)
import Html.Attributes exposing (style)
import Json.Decode exposing (..)
import Http
-- Material design imports
import Material
import Material.Card as Card
import Material.Color as Color
import Material.Grid exposing (grid, cell, size, Device(..))
import Material.Layout as Layout
import Material.Scheme as Scheme
-- API interface to Gemma
type alias Task =
{ name : String
, description : Maybe String
, remaining : Int
}
emptyStringFilter s =
if s == "" then
Nothing
else
Just s
decodeEmptyString : Decoder (Maybe String)
decodeEmptyString =
map emptyStringFilter string
decodeTask : Decoder Task
decodeTask =
map3 Task
(field "name" string)
(field "description" decodeEmptyString)
(field "remaining" int)
loadTasks : Cmd Msg
loadTasks =
let
request =
Http.get "http://localhost:4242/tasks" (list decodeTask)
in
Http.send NewTasks request
-- Elm architecture implementation
type Msg
= None
| LoadTasks
| NewTasks (Result Http.Error (List Task))
| Mdl (Material.Msg Msg)
type alias Model =
{ tasks : List Task
, error : Maybe String
, mdl : Material.Model
}
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
LoadTasks ->
( model, loadTasks )
NewTasks (Ok tasks) ->
( { model | tasks = tasks, error = Nothing }, Cmd.none )
NewTasks (Err err) ->
( { model | error = Just (toString err) }, Cmd.none )
_ ->
( model, Cmd.none )
-- View implementation
white =
Color.text Color.white
taskColor : Task -> Color.Hue
taskColor task =
if task.remaining > 2 then
Color.Green
else if task.remaining < 0 then
Color.Red
else
Color.Yellow
renderTask : Task -> Html Msg
renderTask task =
Card.view
[ Color.background (Color.color (taskColor task) Color.S800) ]
[ Card.title [] [ Card.head [ white ] [ text task.name ] ] ]
-- div [] [ span [] [ ] ]
gemmaView : Model -> Html Msg
gemmaView model =
grid []
(List.map (\t -> cell [ size All 3 ] [ renderTask t ])
model.tasks
)
view : Model -> Html Msg
view model =
gemmaView model |> Scheme.top
-- div [ style [ ( "padding", "2rem" ) ] ]
--
-- |> Scheme.top
main : Program Never Model Msg
main =
let
model =
{ tasks = []
, error = Nothing
, mdl = Material.model
}
in
Html.program
{ init = ( model, Cmd.batch [ loadTasks, Material.init Mdl ] )
, view = view
, update = update
, subscriptions = Material.subscriptions Mdl
}
|
