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Diffstat (limited to 'fun/gemma/frontend/Main.elm')
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diff --git a/fun/gemma/frontend/Main.elm b/fun/gemma/frontend/Main.elm new file mode 100644 index 000000000000..e449908e499c --- /dev/null +++ b/fun/gemma/frontend/Main.elm @@ -0,0 +1,221 @@ +-- Copyright (C) 2016-2017 Vincent Ambo <mail@tazj.in> +-- +-- This file is part of Gemma. +-- +-- Gemma is free software: you can redistribute it and/or modify it +-- under the terms of the GNU General Public License as published by +-- the Free Software Foundation, either version 3 of the License, or +-- (at your option) any later version. + + +module Main exposing (..) + +import Html exposing (Html, text, div, span) +import Html.Attributes exposing (style) +import Json.Decode exposing (..) +import Http +import Time + + +-- 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 +import Material.Options as Options +import Material.Elevation as Elevation +import Material.Button as Button + + +-- 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 "/tasks" (list decodeTask) + in + Http.send NewTasks request + + +completeTask : Task -> Cmd Msg +completeTask task = + let + request = + Http.getString + (String.concat + [ "/complete?task=" + , task.name + ] + ) + in + Http.send (\_ -> LoadTasks) request + + + +-- Elm architecture implementation + + +type Msg + = None + | LoadTasks + | NewTasks (Result Http.Error (List Task)) + | Mdl (Material.Msg Msg) + | Complete Task + + +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 ) + + Complete task -> + ( model, completeTask task ) + + 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 + + +within : Task -> String +within task = + if task.remaining < 0 then + "This task is overdue!" + else if task.remaining > 2 then + String.concat + [ "Relax, this task has " + , toString task.remaining + , " days left before it is due." + ] + else + String.concat + [ "This task should be completed within " + , toString task.remaining + , " days. Consider doing it now!" + ] + + +renderTask : Model -> Task -> Html Msg +renderTask model task = + Card.view + [ Color.background (Color.color (taskColor task) Color.S800) + , Elevation.e3 + ] + [ Card.title [] [ Card.head [ white ] [ text task.name ] ] + , Card.text [ white ] + [ text (Maybe.withDefault "" task.description) + , Html.br [] [] + , text (within task) + ] + , Card.actions + [ Card.border ] + [ Button.render Mdl + [ 0 ] + model.mdl + [ white, Button.ripple, Button.accent, Options.onClick (Complete task) ] + [ text "Completed" ] + ] + ] + + +gemmaView : Model -> Html Msg +gemmaView model = + grid [] + (List.map (\t -> cell [ size All 4 ] [ renderTask model t ]) + model.tasks + ) + + +view : Model -> Html Msg +view model = + gemmaView model |> Scheme.top + + + +-- subscriptions : Model -> Sub Msg + + +subscriptions model = + Sub.batch + [ Material.subscriptions Mdl model + , Time.every (15 * Time.second) (\_ -> LoadTasks) + ] + + +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 = subscriptions + } |