1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
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
import Material.Options as Options
-- 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
completeTask : Task -> Cmd Msg
completeTask task =
let
request =
Http.getString
(String.concat
[ "http://localhost:4242/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.concat
[ "This task should be completed within "
, toString task.remaining
, " days."
]
renderTask : Task -> Html Msg
renderTask task =
Card.view
[ Color.background (Color.color (taskColor task) Color.S800) ]
[ Card.title [] [ Card.head [ white ] [ text task.name ] ]
, Card.text [ white ]
[ text (Maybe.withDefault "" task.description)
, text (within task)
]
, Card.actions
[ Card.border
, white
, Options.onClick (Complete task)
]
[ text "Done!" ]
]
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
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
}
|
