Add more drum sounds

3 files changed, 92 insertions, 46 deletions

diff --git a/src/lib/dict.ts b/src/lib/dict.ts
new file mode 100644
index 0000000..43b9f02
--- /dev/null
+++ b/src/lib/dict.ts
@@ -0,0 +1,21 @@
+type Key = string | number | symbol
+
+export function fromList<V>(xs: Array<{key: Key, value: V}>): Record<Key, V> {
+  let res: any = {}
+  xs.forEach(o => res[o.key] = o.value)
+  return res as Record<Key, V>
+}
+
+export function toList<V>(record: Record<Key, V>): Array<{key: Key, value: V}> {
+  return Object.keys(record)
+    .map(key => ({ key: key, value: record[key] }))
+}
+
+type EnumObject = {[key: string]: number | string};
+type EnumObjectEnum<E extends EnumObject> = E extends {[key: string]: infer ET | string} ? ET : never;
+
+export function values<E extends EnumObject>(enumObject: E): EnumObjectEnum<E>[] {
+  return Object.keys(enumObject)
+    .filter(key => Number.isNaN(Number(key)))
+    .map(key => enumObject[key] as EnumObjectEnum<E>)
+}
diff --git a/src/sounds.ts b/src/sounds.ts
index 5e4c68a..f906a70 100644
--- a/src/sounds.ts
+++ b/src/sounds.ts
@@ -1,13 +1,46 @@
+import * as dict from 'lib/dict'
+
 export type Sounds = Record<Sound, AudioBuffer>
 
 export enum Sound {
-  Bass,
-  Snare,
+  Crash,
+  Ride,
+  TomHigh,
+  TomMedium,
+  TomFloor,
+  HitHatOpen,
   HitHatClosed,
+  Snare,
+  Kick,
 }
 
 export function all(): Array<Sound> {
-  return [Sound.HitHatClosed, Sound.Snare, Sound.Bass]
+  return dict.values(Sound)
+}
+
+export function record<T>(f: (sound: Sound) => T): Record<Sound, T> {
+  let res: any = {}
+
+  all().forEach(async sound => {
+    res[sound] = f(sound)
+  })
+
+  return (res as Record<Sound, T>)
+}
+
+export function toString(sound: Sound): string {
+  switch (sound) {
+    case Sound.Kick: return 'Kick'
+    case Sound.Snare: return 'Snare'
+    case Sound.HitHatOpen: return 'Hit-hat open'
+    case Sound.HitHatClosed: return 'Hit-hat closed'
+    case Sound.Ride: return 'Ride'
+    case Sound.Crash: return 'Crash'
+    case Sound.TomFloor: return 'Tom floor'
+    case Sound.TomMedium: return 'Tom medium'
+    case Sound.TomHigh: return 'Tom high'
+    default: throw `Sound ${sound} is unknown.`
+  }
 }
 
 const audioContext = new AudioContext()
@@ -17,27 +50,37 @@ export async function load(): Promise<Sounds> {
   if (lazy !== undefined) {
     return lazy
   } else {
-    let [bass, snare, hitHatClosed] = await Promise.all([
-      fetchSound('/sounds/bass.opus'),
-      fetchSound('/sounds/snare.opus'),
-      fetchSound('/sounds/hit-hat-closed.opus')
-    ])
-
-    lazy = { 
-      [Sound.Bass]: bass,
-      [Sound.Snare]: snare,
-      [Sound.HitHatClosed]: hitHatClosed
-    }
-    return lazy
+    let sounds = dict.fromList(await Promise.all(dict.toList(record(fetchSound)).map(async obj => {
+      let value = await obj.value
+      return { key: obj.key, value }
+    }))) as Sounds
+
+    lazy = sounds
+    return sounds
   }
 }
 
-async function fetchSound(name: string): Promise<AudioBuffer> {
-  return await fetch(name)
+async function fetchSound(sound: Sound): Promise<AudioBuffer> {
+  return await fetch(path(sound))
     .then(res => res.arrayBuffer())
     .then(ArrayBuffer => audioContext.decodeAudioData(ArrayBuffer))
 }
 
+function path(sound: Sound): string {
+  switch (sound) {
+    case Sound.Kick: return 'sounds/kick.opus'
+    case Sound.Snare: return 'sounds/snare.opus'
+    case Sound.HitHatOpen: return 'sounds/hit-hat-open.opus'
+    case Sound.HitHatClosed: return 'sounds/hit-hat-closed.opus'
+    case Sound.Ride: return 'sounds/ride.opus'
+    case Sound.Crash: return 'sounds/crash.opus'
+    case Sound.TomFloor: return 'sounds/tom-floor.opus'
+    case Sound.TomMedium: return 'sounds/tom-medium.opus'
+    case Sound.TomHigh: return 'sounds/tom-high.opus'
+    default: throw `Sound ${sound} is unknown.`
+  }
+}
+
 export function play(sounds: Sounds, sound: Sound): void {
   const source = audioContext.createBufferSource()
   source.buffer = sounds[sound]
diff --git a/src/view/sequencer.ts b/src/view/sequencer.ts
index bc26e69..f7e397f 100644
--- a/src/view/sequencer.ts
+++ b/src/view/sequencer.ts
@@ -7,27 +7,15 @@ import * as block from 'view/sequencer/block'
 
 export function view() {
   let index = -1
-  let columns = [{
-    [Sound.Bass]: true,
-    [Sound.Snare]: false,
-    [Sound.HitHatClosed]: false,
-  }]
+  let columns = [soundsLib.record(sound => sound == Sound.Kick)]
   let blocksNode = h('div', 
     { className: 'g-Sequencer__Blocks' }, 
-    block.column([
-      { 
-        checked: false,
-        onCheck: checked => columns[0][Sound.HitHatClosed] = checked
-      },
-      { 
-        checked: false,
-        onCheck: checked => columns[0][Sound.Snare] = checked
-      },
-      { 
-        checked: true,
-        onCheck: checked => columns[0][Sound.Bass] = checked
-      }
-    ])
+    block.column(
+      soundsLib.all().map(sound => ({
+        checked: sound == Sound.Kick,
+        onCheck: checked => columns[0][sound] = checked
+      }))
+    )
   )
 
   let onNextStep = (sounds: soundsLib.Sounds) => {
@@ -69,11 +57,7 @@ export function view() {
         columns.pop()
       },
       onAdd: index => {
-        columns.push({
-          [Sound.Bass]: false,
-          [Sound.Snare]: false,
-          [Sound.HitHatClosed]: false,
-        })
+        columns.push(soundsLib.record(sound => false))
         blocksNode.appendChild(block.column(
           soundsLib.all().map(sound => ({
             checked: false,
@@ -86,9 +70,7 @@ export function view() {
       { className: 'g-Sequencer__Grid' },
       h('ol',
         { className: 'g-Sequencer__Column' },
-        soundItem('Hit-hat (closed)', Sound.HitHatClosed),
-        soundItem('Snare', Sound.Snare),
-        soundItem('Bass', Sound.Bass)
+        ...soundsLib.all().map(soundItem)
       ),
       blocksNode
     )
@@ -97,13 +79,13 @@ export function view() {
   return sequencer
 }
 
-function soundItem(name: string, sound: Sound): Element {
+function soundItem(sound: Sound): Element {
   return h('li', 
     { onclick: async () => {
         let sounds = await soundsLib.load()
         soundsLib.play(sounds, sound)
       }
     },
-    name
+    soundsLib.toString(sound)
   )
 }