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
|
module State exposing (..)
import Random
import Random.List
import Theory
type Msg
= NextChord
| NewChord Theory.Chord
| Play
| Pause
| SetTempo String
| ToggleInversion Theory.ChordInversion
| ToggleKey Theory.Key
| DoNothing
| SetView View
| ToggleFlashCard
type View
= Preferences
| Practice
| Overview
type alias Model =
{ whitelistedChords : List Theory.Chord
, whitelistedChordTypes : List Theory.ChordType
, whitelistedInversions : List Theory.ChordInversion
, whitelistedPitchClasses : List Theory.PitchClass
, whitelistedKeys : List Theory.Key
, selectedChord : Maybe Theory.Chord
, isPaused : Bool
, tempo : Int
, firstNote : Theory.Note
, lastNote : Theory.Note
, view : View
, showFlashCard : Bool
}
{-| The initial state for the application.
-}
init : Model
init =
let
( firstNote, lastNote ) =
( Theory.C3, Theory.C6 )
inversions =
[ Theory.Root ]
chordTypes =
Theory.allChordTypes
pitchClasses =
Theory.allPitchClasses
keys =
[ { pitchClass = Theory.C, mode = Theory.MajorMode } ]
in
{ whitelistedChords =
keys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion inversions)
, whitelistedChordTypes = chordTypes
, whitelistedInversions = inversions
, whitelistedPitchClasses = pitchClasses
, whitelistedKeys = keys
, selectedChord = Nothing
, isPaused = True
, tempo = 10
, firstNote = firstNote
, lastNote = lastNote
, view = Preferences
, showFlashCard = True
}
{-| 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
, isPaused = True
}
, Cmd.none
)
NewChord chord ->
( { model | selectedChord = Just chord }
, Cmd.none
)
NextChord ->
( model
, Random.generate
(\x ->
case x of
( Just chord, _ ) ->
NewChord chord
( Nothing, _ ) ->
DoNothing
)
(Random.List.choose model.whitelistedChords)
)
Play ->
( { model | isPaused = False }
, Cmd.none
)
Pause ->
( { model | isPaused = True }
, Cmd.none
)
ToggleInversion inversion ->
let
inversions =
if List.member inversion model.whitelistedInversions then
List.filter ((/=) inversion) model.whitelistedInversions
else
inversion :: model.whitelistedInversions
in
( { model
| whitelistedInversions = inversions
, whitelistedChords =
model.whitelistedKeys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion inversions)
}
, Cmd.none
)
ToggleKey key ->
let
keys =
if List.member key model.whitelistedKeys then
List.filter ((/=) key) model.whitelistedKeys
else
key :: model.whitelistedKeys
in
( { model
| whitelistedKeys = keys
, whitelistedChords =
keys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion model.whitelistedInversions)
, selectedChord = Nothing
}
, Cmd.none
)
SetTempo tempo ->
( { model
| tempo =
case String.toInt tempo of
Just x ->
x
Nothing ->
model.tempo
}
, Cmd.none
)
ToggleFlashCard ->
( { model | showFlashCard = not model.showFlashCard }, Cmd.none )
|
