lofi

1import { atom, read, update } from 'claude-code'
2import type { EngineInterface, Register } from 'claude-code'
3
4import type { LofiMood, LofiSnap } from '../types'
5import { pxOf } from './lib/kz.ts'
6import { MOODS, assetOf, gainOf, isMood, lofiSvg, moodSettingOf, resolveMood } from './mood.ts'
7
8const snapAtom = atom({ plugin: 'lofi', key: 'snap' } as const, null)
9const hiddenAtom = atom({ plugin: 'lofi', key: 'isHidden' } as const, false)
10
11/** A loop that ends on its own this soon was not played (no player here). */
12const NO_PLAYER_MS = 2500
13
14// The player. One loop at a time; its AbortController stops it.
15let isEnabled = false
16let moodSetting = 'auto'
17let gain = 0.5
18let isWorking = false
19let player: { stop: AbortController; mood: LofiMood; since: number } | undefined
20/** Set when the engine could not play a loop; cleared at the next turn. */
21let isMuted = false
22let lastKey = ''
23
24async function currentMood($: EngineInterface): Promise<LofiMood> {
25  return resolveMood(moodSetting, new Date(await $.clock.now()).getHours())
26}
27
28async function publish($: EngineInterface): Promise<void> {
29  const fallback = await currentMood($)
30  // Read the player once, after the await: a loop may have started meanwhile.
31  const p = player
32  const snap: LofiSnap = { isPlaying: p !== undefined, mood: p?.mood ?? fallback, isEnabled, since: p?.since ?? 0 }
33  const key = JSON.stringify(snap)
34  if (key === lastKey) return
35  await update($, snapAtom, () => snap)
36  // Only once it is written, so a refused write is tried again next time.
37  lastKey = key
38}
39
40function stop(): void {
41  const p = player
42  player = undefined
43  p?.stop.abort()
44}
45
46/** Plays one loop until it is stopped; `p` is already the current player. */
47async function play($: EngineInterface, p: NonNullable<typeof player>): Promise<void> {
48  try {
49    await publish($)
50  } catch {
51    // The band catches up at the next publish; the music plays regardless.
52  }
53  try {
54    await $.audio.play({ asset: assetOf(p.mood) }, { shouldLoop: true, gain, signal: p.stop.signal })
55  } catch {
56    // The engine could not play it: treated as no player below.
57  }
58  // The loop ended. If we did not stop it, the engine could not play it.
59  if (player === p) {
60    player = undefined
61    if ((await $.clock.now()) - p.since < NO_PLAYER_MS) isMuted = true
62    await publish($)
63  }
64}
65
66/** Plays while enabled and working, in the mood of the moment; stops otherwise. */
67async function reconcile($: EngineInterface): Promise<void> {
68  const now = await $.clock.now()
69  const mood = resolveMood(moodSetting, new Date(now).getHours())
70  // From here on no await until the player is settled, so two ticks never start two loops.
71  const want = isEnabled && isWorking && !isMuted
72  if (player && (!want || player.mood !== mood)) stop()
73  if (want && !player) {
74    player = { stop: new AbortController(), mood, since: now }
75    void play($, player).catch(() => undefined)
76  }
77  await publish($)
78}
79
80async function setHidden($: EngineInterface, isHidden: boolean): Promise<void> {
81  await update($, hiddenAtom, () => isHidden)
82  try {
83    await $.store.set('hidden', isHidden)
84  } catch {
85    // Not persisted; this session still honours it.
86  }
87}
88
89async function remember($: EngineInterface, key: string, value: unknown): Promise<void> {
90  try {
91    await $.store.set(key, value)
92  } catch {
93    // Not persisted; this session still honours it.
94  }
95}
96
97async function command($: EngineInterface, args: string): Promise<string> {
98  const [verb, arg = ''] = args.trim().toLowerCase().split(/\s+/)
99  if (verb === 'on' || verb === 'off') {
100    isEnabled = verb === 'on'
101    isMuted = false
102    await remember($, 'enabled', isEnabled)
103    $.clock.after(10, () => void reconcile($).catch(() => undefined))
104    if (!isEnabled) stop()
105    await publish($)
106    return isEnabled ? `♪ Lofi on: ${await currentMood($)} plays while Claude works.` : 'Lofi off.'
107  }
108  if (verb === 'mood') {
109    if (arg !== 'auto' && !isMood(arg)) return `Moods: auto, ${MOODS.join(', ')}.`
110    moodSetting = arg
111    await remember($, 'mood', arg)
112    $.clock.after(10, () => void reconcile($).catch(() => undefined))
113    return `Lofi mood: ${arg}${arg === 'auto' ? ` (now ${await currentMood($)})` : ''}.`
114  }
115  if (verb === 'status') {
116    const mood = await currentMood($)
117    return `Lofi is ${isEnabled ? 'on' : 'off'}; mood ${moodSetting}${moodSetting === 'auto' ? ` (${mood})` : ''}; ${player ? `playing ${player.mood}` : isMuted ? 'no audio player on this surface' : 'silent until Claude works'}.`
118  }
119  // Bare /lofi: show or hide the band.
120  const isHidden = !(await read($, hiddenAtom))
121  await setHidden($, isHidden)
122  return `${isHidden ? 'Lofi band hidden.' : 'Lofi band shown.'}${isEnabled ? '' : ' Music is off: /lofi on.'}`
123}
124
125export const register: Register = (on, options) => {
126  on('session.start', async ($, e, next) => {
127    const started = await next(e)
128    stop()
129    isWorking = false
130    isMuted = false
131    lastKey = ''
132    isEnabled = options.enabled === true
133    moodSetting = moodSettingOf(options.mood)
134    gain = gainOf(options.volume)
135    await $.command.register({ name: 'lofi', description: 'KOZMOS: lo-fi music while Claude works (on, off, mood <m>, status; bare toggles the band)', argumentHint: '[on|off|mood <auto|focus|deep|night|sunny>|status]', immediate: true })
136    try {
137      const enabled = await $.store.get('enabled')
138      if (typeof enabled === 'boolean') isEnabled = enabled
139      const mood = await $.store.get('mood')
140      if (typeof mood === 'string' && (mood === 'auto' || isMood(mood))) moodSetting = mood
141      const hidden = await $.store.get('hidden')
142      if (typeof hidden === 'boolean') await update($, hiddenAtom, () => hidden)
143    } catch {
144      // A fresh store: the userConfig values stand.
145    }
146    await publish($).catch(() => undefined)
147    // The tick catches the hour turning (auto mood) and a loop that needs restarting.
148    $.clock.every(1000, () => void reconcile($).catch(() => undefined))
149    return started
150  })
151
152  on('command.run', { command: 'lofi' }, async ($, e) => ({ text: await command($, e.args) }))
153
154  on('turn.start', async ($, e, next) => {
155    isWorking = true
156    isMuted = false
157    // Started from a timer, not from this hook: the loop outlives the hook.
158    $.clock.after(10, () => void reconcile($).catch(() => undefined))
159    return next(e)
160  })
161
162  on('turn.complete', async ($, e, next) => {
163    if (e.agentId === undefined) {
164      isWorking = false
165      stop()
166      void publish($).catch(() => undefined)
167    }
168    return next(e)
169  })
170
171  on('session.end', async ($, e, next) => {
172    stop()
173    return next(e)
174  })
175
176  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
177    const drawn = await next(e)
178    if (e.props.hasSurvey || (await read($, hiddenAtom))) return drawn
179    const snap = await read($, snapAtom)
180    if (!snap || !snap.isPlaying) return drawn
181
182    const { Box, Button } = $.ui.resolve(e)
183    const hide = <Button key="lofi-hide" label="✕" plain dimColor role="dismiss" onPress={() => void setHidden($, true)} />
184
185    if (e.surface === 'terminal') {
186      const { Client } = $.ui.resolve(e)
187      const bands = Math.max(6, Math.min(16, (e.props.bodyColumns || 80) - 24))
188      return (
189        <Box flexDirection="column">
190          {drawn}
191          <Box flexDirection="row">
192            <Client key="lofi" module="./eq.tsx" width={14 + snap.mood.length + bands} height={1} props={{ mood: snap.mood, bands }} />
193            {hide}
194          </Box>
195        </Box>
196      )
197    }
198
199    // Desktop, VS Code and mobile: one animated Svg.
200    const { Svg } = $.ui.resolve(e)
201    const W = Math.min(pxOf(e.props.bodyColumns) - 28, 260)
202    return (
203      <Box flexDirection="column">
204        {drawn}
205        <Box flexDirection="row" alignItems="center">
206          <Svg source={lofiSvg(snap.mood, W, await $.clock.now(), snap.since)} alt={`Lofi playing: ${snap.mood}`} width={W} height={30} />
207          {hide}
208        </Box>
209      </Box>
210    )
211  })
212}
213

1// GENERATED by scripts/sync-shared.mjs from shared/kz.ts. Do not edit here.
2// KOZMOS shared kit. Source of truth: shared/kz.ts at the bundle root.
3// `node scripts/sync-shared.mjs` copies it into every mod as hooks/lib/kz.ts,
4// because a hooks module may only import files inside its own plugin.
5// Edit the root copy, never a mod's copy.
6
7// ---------------------------------------------------------------------------
8// Palette: one neon family across every KOZMOS mod.
9
10export const KZ = {
11  violet: '#a78bfa',
12  magenta: '#f472b6',
13  cyan: '#22d3ee',
14  teal: '#2dd4bf',
15  green: '#4ade80',
16  lime: '#a3e635',
17  yellow: '#facc15',
18  amber: '#fb923c',
19  red: '#f87171',
20  blue: '#60a5fa',
21  clay: '#d97757',
22  ink: '#1f1e1d',
23  mist: '#9ca3af',
24} as const
25
26/** Tool families, colored the same in every mod. */
27export function toolColor(tool: string): string {
28  const t = String(tool)
29  if (t === 'Bash' || t === 'PowerShell') return KZ.green
30  if (t === 'Edit' || t === 'Write' || t === 'NotebookEdit' || t === 'MultiEdit') return KZ.yellow
31  if (t === 'Read' || t === 'Glob' || t === 'Grep' || t === 'LSP') return KZ.blue
32  if (t === 'Agent' || t === 'Task' || t === 'Workflow') return KZ.violet
33  if (t.startsWith('Web')) return KZ.cyan
34  if (t.startsWith('Todo') || t.startsWith('Task')) return KZ.teal
35  if (t.startsWith('mcp__')) return KZ.magenta
36  return KZ.mist
37}
38
39/** A short glyph per tool family. */
40export function toolGlyph(tool: string): string {
41  const t = String(tool)
42  if (t === 'Bash' || t === 'PowerShell') return '$'
43  if (t === 'Edit' || t === 'Write' || t === 'NotebookEdit') return '✎'
44  if (t === 'Read') return '◉'
45  if (t === 'Glob' || t === 'Grep') return '⌕'
46  if (t === 'Agent') return '◈'
47  if (t.startsWith('Web')) return '◍'
48  if (t.startsWith('Todo') || t.startsWith('Task')) return '☑'
49  if (t.startsWith('mcp__')) return '⬡'
50  return '•'
51}
52
53// ---------------------------------------------------------------------------
54// Colors.
55
56export function hexToRgb(hex: string): [number, number, number] {
57  const h = hex.replace('#', '')
58  const n = parseInt(h.length === 3 ? h.split('').map(c => c + c).join('') : h, 16)
59  return [(n >> 16) & 255, (n >> 8) & 255, n & 255]
60}
61
62export function rgbToHex(r: number, g: number, b: number): string {
63  const c = (v: number) => Math.max(0, Math.min(255, Math.round(v))).toString(16).padStart(2, '0')
64  return `#${c(r)}${c(g)}${c(b)}`
65}
66
67export function mix(a: string, b: string, t: number): string {
68  const [r1, g1, b1] = hexToRgb(a)
69  const [r2, g2, b2] = hexToRgb(b)
70  const k = clamp01(t)
71  return rgbToHex(r1 + (r2 - r1) * k, g1 + (g2 - g1) * k, b1 + (b2 - b1) * k)
72}
73
74/** Green at 0, yellow at 0.6, red at 1: the heat of a gauge. */
75export function heat(t: number): string {
76  const k = clamp01(t)
77  return k < 0.6 ? mix(KZ.green, KZ.yellow, k / 0.6) : mix(KZ.yellow, KZ.red, (k - 0.6) / 0.4)
78}
79
80/** A smooth rainbow for hues 0..1 (for auroras, plasma and the like). */
81export function hue(h: number, s = 0.75, l = 0.6): string {
82  const k = ((h % 1) + 1) % 1
83  const a = s * Math.min(l, 1 - l)
84  const f = (n: number) => {
85    const x = (n + k * 12) % 12
86    return l - a * Math.max(-1, Math.min(x - 3, 9 - x, 1))
87  }
88  return rgbToHex(f(0) * 255, f(8) * 255, f(4) * 255)
89}
90
91export function hexToInt(hex: string): number {
92  const [r, g, b] = hexToRgb(hex)
93  return (r << 16) | (g << 8) | b
94}
95
96// ---------------------------------------------------------------------------
97// Numbers and text.
98
99export const clamp01 = (v: number): number => (Number.isFinite(v) ? Math.max(0, Math.min(1, v)) : 0)
100
101export function fmtTokens(n: number): string {
102  if (!Number.isFinite(n)) return '—'
103  // Each unit starts where the one below would round up to 1000 of itself.
104  if (n >= 999.5e6) return `${(n / 1e9).toFixed(1)}B`
105  if (n >= 999_500) return `${(n / 1e6).toFixed(n >= 1e7 ? 0 : 1)}M`
106  if (n >= 999.5) return `${(n / 1e3).toFixed(n >= 1e4 ? 0 : 1)}k`
107  return `${Math.round(n)}`
108}
109
110export function fmtUsd(usd: number): string {
111  if (!Number.isFinite(usd)) return '$—'
112  if (usd < 0.01 && usd > 0) return '<$0.01'
113  return usd < 100 ? `$${usd.toFixed(2)}` : `$${Math.round(usd)}`
114}
115
116/** 0:42, 3:07, 1:02:33. */
117export function fmtClock(ms: number): string {
118  const s = Math.max(0, Math.round(ms / 1000))
119  const h = Math.floor(s / 3600)
120  const m = Math.floor((s % 3600) / 60)
121  const ss = String(s % 60).padStart(2, '0')
122  return h ? `${h}:${String(m).padStart(2, '0')}:${ss}` : `${m}:${ss}`
123}
124
125/** 42s, 7m, 2h41m, 3d4h: compact durations for countdowns. */
126export function fmtSpan(ms: number): string {
127  const s = Math.max(0, Math.round(ms / 1000))
128  if (s < 60) return `${s}s`
129  const m = Math.floor(s / 60)
130  if (m < 60) return `${m}m`
131  const h = Math.floor(m / 60)
132  if (h < 48) return `${h}h${String(m % 60).padStart(2, '0')}m`
133  return `${Math.floor(h / 24)}d${h % 24}h`
134}
135
136export function fmtPct(p: number | undefined): string {
137  return p === undefined || !Number.isFinite(p) ? '—' : `${Math.round(p)}%`
138}
139
140export function clip(s: string, max: number): string {
141  const one = s.replace(/\s+/g, ' ').trim()
142  return one.length > max ? one.slice(0, Math.max(1, max - 1)) + '…' : one
143}
144
145export function padEnd(s: string, n: number): string {
146  return s.length >= n ? s.slice(0, n) : s + ' '.repeat(n - s.length)
147}
148
149export function padStart(s: string, n: number): string {
150  return s.length >= n ? s.slice(s.length - n) : ' '.repeat(n - s.length) + s
151}
152
153/** `claude-opus-5-5[1m]` → `Opus 5.5`. */
154export function modelName(id: string | undefined): string {
155  if (!id) return '—'
156  const m = /(fable|mythos|opus|sonnet|haiku)-(\d+)(?:-(\d{1,2})(?!\d))?/i.exec(id)
157  if (!m) return id.replace(/^claude-/, '').replace(/\[.*\]$/, '')
158  const fam = m[1]!
159  return `${fam.charAt(0).toUpperCase()}${fam.slice(1).toLowerCase()} ${m[2]}${m[3] ? '.' + m[3] : ''}`
160}
161
162/** Last path segment, either slash. */
163export function baseName(p: string): string {
164  const parts = p.split(/[\\/]/).filter(Boolean)
165  return parts[parts.length - 1] ?? p
166}
167
168/** A stable small hash for seeding. */
169export function hash(s: string): number {
170  let h = 2166136261
171  for (let i = 0; i < s.length; i++) {
172    h ^= s.charCodeAt(i)
173    h = Math.imul(h, 16777619)
174  }
175  return h >>> 0
176}
177
178/** Deterministic 0..1 noise from two ints. */
179export function noise(x: number, y: number): number {
180  const s = Math.sin(x * 12.9898 + y * 78.233) * 43758.5453
181  return s - Math.floor(s)
182}
183
184/** A seeded PRNG (mulberry32). */
185export function rng(seed: number): () => number {
186  let a = seed >>> 0
187  return () => {
188    a = (a + 0x6d2b79f5) >>> 0
189    let t = a
190    t = Math.imul(t ^ (t >>> 15), t | 1)
191    t ^= t + Math.imul(t ^ (t >>> 7), t | 61)
192    return ((t ^ (t >>> 14)) >>> 0) / 4294967296
193  }
194}
195
196// ---------------------------------------------------------------------------
197// Text gauges for the terminal.
198
199const EIGHTHS = ['', '▏', '▎', '▍', '▌', '▋', '▊', '▉']
200
201/** A smooth bar with eighth blocks: `█████▍    `. */
202export function bar(ratio: number, width: number, empty = '░'): string {
203  const w = Math.max(1, Math.floor(width))
204  const exact = clamp01(ratio) * w
205  const full = Math.floor(exact)
206  const part = EIGHTHS[Math.floor((exact - full) * 8)] ?? ''
207  const used = full + (part ? 1 : 0)
208  return '█'.repeat(full) + part + empty.repeat(Math.max(0, w - used))
209}
210
211/** A segmented gauge: `▰▰▰▱▱▱`. */
212export function pips(ratio: number, width: number, on = '▰', off = '▱'): string {
213  const w = Math.max(1, Math.floor(width))
214  const n = Math.round(clamp01(ratio) * w)
215  return on.repeat(n) + off.repeat(w - n)
216}
217
218const SPARK = '▁▂▃▄▅▆▇█'
219
220/** A sparkline of the last `width` values, scaled to their own max (or `max`). */
221export function sparkline(values: readonly number[], width: number, max?: number): string {
222  const tail = values.slice(-Math.max(1, width))
223  const top = max ?? Math.max(1e-9, ...tail)
224  const line = tail.map(v => SPARK[Math.min(7, Math.max(0, Math.round((v / top) * 7)))] ?? '▁').join('')
225  return line.padStart(width, ' ')
226}
227
228/** Braille line graph, 2 samples per cell, `rows` cells tall. */
229export function brailleGraph(values: readonly number[], width: number, rows: number, max?: number): string[] {
230  const samples = values.slice(-(width * 2))
231  const top = max ?? Math.max(1e-9, ...samples)
232  const dotsTall = rows * 4
233  const grid: number[][] = Array.from({ length: rows }, () => Array.from({ length: width }, () => 0))
234  const offset = width * 2 - samples.length
235  // Dot bits per column, from the bottom row of a cell up.
236  const LEFT = [0x40, 0x04, 0x02, 0x01]
237  const RIGHT = [0x80, 0x20, 0x10, 0x08]
238  samples.forEach((v, i) => {
239    const x = offset + i
240    const col = Math.floor(x / 2)
241    const isRight = x % 2 === 1
242    const h = Math.round(clamp01(v / top) * (dotsTall - 1))
243    for (let d = 0; d <= h; d++) {
244      const row = rows - 1 - Math.floor(d / 4)
245      const bits = isRight ? RIGHT : LEFT
246      const cellRow = grid[row]
247      if (cellRow && col >= 0) cellRow[col] = (cellRow[col] ?? 0) | bits[d % 4]!
248    }
249  })
250  return grid.map(r => r.map(b => String.fromCharCode(0x2800 + b)).join(''))
251}
252
253// ---------------------------------------------------------------------------
254// Raster: a grid of colored cells, packed as the engine wants it.
255
256const B64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
257
258export function toBase64(bytes: Uint8Array): string {
259  let out = ''
260  let i = 0
261  for (; i + 2 < bytes.length; i += 3) {
262    const n = (bytes[i]! << 16) | (bytes[i + 1]! << 8) | bytes[i + 2]!
263    out += B64[(n >> 18) & 63]! + B64[(n >> 12) & 63]! + B64[(n >> 6) & 63]! + B64[n & 63]!
264  }
265  const rest = bytes.length - i
266  if (rest === 1) {
267    const n = bytes[i]! << 16
268    out += B64[(n >> 18) & 63]! + B64[(n >> 12) & 63]! + '=='
269  } else if (rest === 2) {
270    const n = (bytes[i]! << 16) | (bytes[i + 1]! << 8)
271    out += B64[(n >> 18) & 63]! + B64[(n >> 12) & 63]! + B64[(n >> 6) & 63]! + '='
272  }
273  return out
274}
275
276/** The terminal's own default color, for a cell's foreground or background. */
277export const DEFAULT_COLOR = 0x01000000
278
279export class Canvas {
280  readonly cols: number
281  readonly rows: number
282  private readonly words: Uint32Array
283
284  constructor(cols: number, rows: number) {
285    this.cols = Math.max(1, Math.min(512, Math.floor(cols)))
286    this.rows = Math.max(1, Math.min(256, Math.floor(rows)))
287    this.words = new Uint32Array(this.cols * this.rows * 3)
288    this.clear()
289  }
290
291  clear(bg: number = DEFAULT_COLOR): void {
292    for (let i = 0; i < this.cols * this.rows; i++) {
293      this.words[i * 3] = 0x20
294      this.words[i * 3 + 1] = DEFAULT_COLOR
295      this.words[i * 3 + 2] = bg
296    }
297  }
298
299  /** Puts one width-1 character; colors are '#rrggbb' or a packed int. */
300  set(x: number, y: number, ch: string, fg?: string | number, bg?: string | number): void {
301    const cx = Math.floor(x)
302    const cy = Math.floor(y)
303    if (cx < 0 || cy < 0 || cx >= this.cols || cy >= this.rows) return
304    const i = (cy * this.cols + cx) * 3
305    const code = ch.codePointAt(0) ?? 0x20
306    this.words[i] = code > 0xffff || code < 0x20 ? 0x20 : code
307    if (fg !== undefined) this.words[i + 1] = typeof fg === 'number' ? fg : hexToInt(fg)
308    if (bg !== undefined) this.words[i + 2] = typeof bg === 'number' ? bg : hexToInt(bg)
309  }
310
311  /** Writes a string left to right, clipped to the canvas. */
312  text(x: number, y: number, s: string, fg?: string | number, bg?: string | number): void {
313    let cx = x
314    for (const ch of s) {
315      this.set(cx, y, ch, fg, bg)
316      cx++
317    }
318  }
319
320  /** Paints a cell's background only, keeping its character. */
321  paint(x: number, y: number, bg: string | number): void {
322    const cx = Math.floor(x)
323    const cy = Math.floor(y)
324    if (cx < 0 || cy < 0 || cx >= this.cols || cy >= this.rows) return
325    this.words[(cy * this.cols + cx) * 3 + 2] = typeof bg === 'number' ? bg : hexToInt(bg)
326  }
327
328  /** Two vertical pixels per cell with the upper-half block: `py` is in half-cells. */
329  pixel(x: number, py: number, color: string): void {
330    const cx = Math.floor(x)
331    const cy = Math.floor(py / 2)
332    if (cx < 0 || cy < 0 || cx >= this.cols || cy >= this.rows) return
333    const i = (cy * this.cols + cx) * 3
334    const c = hexToInt(color)
335    const isTop = Math.floor(py) % 2 === 0
336    if (this.words[i] !== 0x2580) {
337      this.words[i] = 0x2580
338      this.words[i + 1] = DEFAULT_COLOR
339      this.words[i + 2] = DEFAULT_COLOR
340    }
341    if (isTop) this.words[i + 1] = c
342    else this.words[i + 2] = c
343  }
344
345  /** The `cells` prop of a Raster. */
346  encode(): string {
347    return toBase64(new Uint8Array(this.words.buffer))
348  }
349}
350
351// ---------------------------------------------------------------------------
352// SVG for the desktop: one drawing per row (the desktop wraps siblings).
353
354export const FONT = "-apple-system,BlinkMacSystemFont,'Segoe UI',Inter,sans-serif"
355export const MONO = "ui-monospace,'Cascadia Code','SF Mono',Consolas,monospace"
356
357const XML_ESC: Record<string, string> = { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }
358
359export function xml(s: string): string {
360  return s.replace(/[&<>"']/g, c => XML_ESC[c]!)
361}
362
363/** Theme-aware classes every KOZMOS drawing shares: t text, s secondary, m muted, k track, p panel. */
364export const SVG_BASE_CSS = `
365.t{fill:#1f1f1f}.s{fill:#5f5f5c}.m{fill:#8e8e8a}.k{fill:#e7e5e0}.p{fill:#f5f4f1}.ln{stroke:#e1dfda}
366@media (prefers-color-scheme: dark){.t{fill:#ededed}.s{fill:#b4b4b0}.m{fill:#7c7c78}.k{fill:#2d2d2b}.p{fill:#232322}.ln{stroke:#363634}}
367.pulse{animation:kzp 1.6s ease-in-out infinite}@keyframes kzp{50%{opacity:.35}}
368.spin{transform-box:fill-box;transform-origin:center;animation:kzs 2s linear infinite}@keyframes kzs{to{transform:rotate(360deg)}}
369@media (prefers-reduced-motion: reduce){*{animation:none!important}}
370`
371
372export function svg(width: number, height: number, body: string, css = ''): string {
373  return `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0 0 ${width} ${height}"><style>${SVG_BASE_CSS}${css}</style>${body}</svg>`
374}
375
376/** Rough width of UI text in px, for fitting labels. */
377export function textWidth(s: string, size: number): number {
378  let w = 0
379  for (const ch of s) w += (/[\s.,:;'|!il1()[\]]/.test(ch) ? 0.3 : /[A-Z@%MWmw]/.test(ch) ? 0.72 : 0.56) * size
380  return w
381}
382
383export function fitText(s: string, size: number, maxW: number): string {
384  if (textWidth(s, size) <= maxW) return s
385  let out = ''
386  for (const ch of s) {
387    if (textWidth(out + ch + '…', size) > maxW) break
388    out += ch
389  }
390  return out + '…'
391}
392
393/** A rounded progress bar as SVG markup. */
394export function svgBar(x: number, y: number, w: number, h: number, ratio: number, color: string): string {
395  const fw = Math.max(0, Math.min(w, w * clamp01(ratio)))
396  return `<rect class="k" x="${x}" y="${y}" width="${w}" height="${h}" rx="${h / 2}"/>` +
397    (fw > 0 ? `<rect x="${x}" y="${y}" width="${Math.max(h, fw)}" height="${h}" rx="${h / 2}" fill="${color}"/>` : '')
398}
399
400/** SVG text helper. */
401export function svgText(x: number, y: number, s: string, opts: { cls?: string; size?: number; weight?: number; anchor?: 'start' | 'middle' | 'end'; fill?: string; mono?: boolean } = {}): string {
402  const { cls = 't', size = 12, weight = 400, anchor = 'start', fill, mono = false } = opts
403  return `<text ${fill ? `fill="${fill}"` : `class="${cls}"`} x="${x}" y="${y}" font-family="${mono ? MONO : FONT}" font-size="${size}" font-weight="${weight}" text-anchor="${anchor}" font-variant-numeric="tabular-nums">${xml(s)}</text>`
404}
405
406/** Pixel width a desktop pane or band gives a drawing for `columns` reported columns. */
407export function pxOf(columns: number | undefined, fallback = 60, slack = 8): number {
408  return Math.max(200, Math.min(1600, (columns || fallback) * 8 - slack))
409}
410
411// ---------------------------------------------------------------------------
412// Prices, USD per million tokens: input, output, cache read, cache write (5 min).
413// Anthropic first-party rates as of 2026-10. Used only where the engine reports
414// tokens and not money (a subagent's own spend); the session total comes from
415// $.session.usage().cost, which is the engine's.
416
417const PRICES: [RegExp, [number, number, number, number]][] = [
418  [/fable|mythos/i, [10, 50, 0.25, 12.5]],
419  [/opus-5-5/i, [4, 20, 0.2, 5]],
420  [/opus/i, [5, 25, 0.5, 6.25]],
421  [/sonnet-5/i, [2, 10, 0.2, 2.5]],
422  [/sonnet/i, [3, 15, 0.3, 3.75]],
423  [/haiku-5/i, [0.1, 0.5, 0.01, 0.125]],
424  [/haiku/i, [1, 5, 0.1, 1.25]],
425]
426
427export type Usage = {
428  input_tokens?: number
429  output_tokens?: number
430  cache_read_input_tokens?: number
431  cache_creation_input_tokens?: number
432}
433
434export function priceOf(model: string): [number, number, number, number] {
435  return PRICES.find(([re]) => re.test(model))?.[1] ?? [4, 20, 0.2, 5]
436}
437
438export function costOf(model: string, u: Usage | null | undefined): number {
439  if (!u) return 0
440  const [i, o, r, w] = priceOf(model)
441  return ((u.input_tokens ?? 0) * i + (u.output_tokens ?? 0) * o + (u.cache_read_input_tokens ?? 0) * r + (u.cache_creation_input_tokens ?? 0) * w) / 1e6
442}
443
444export function tokensOf(u: Usage | null | undefined): number {
445  if (!u) return 0
446  return (u.input_tokens ?? 0) + (u.output_tokens ?? 0) + (u.cache_read_input_tokens ?? 0) + (u.cache_creation_input_tokens ?? 0)
447}
448
449/** The context a request filled: everything it read plus what it wrote. */
450export function contextOf(u: Usage | null | undefined): number {
451  return tokensOf(u)
452}
453
454export function windowOf(model: string): number {
455  return /haiku-4/i.test(model) ? 200_000 : 1_000_000
456}
457
458// ---------------------------------------------------------------------------
459// Rate limits.
460
461export type Limit = { kind: string; percentUsed: number; resetsAt?: string }
462
463export function limitLabel(kind: string): string {
464  if (kind === 'five_hour') return '5h'
465  if (kind === 'seven_day') return '7d'
466  if (kind === 'spend_limit') return '$'
467  return kind.replace(/_/g, ' ')
468}
469
470/** Milliseconds until a window resets, or undefined. */
471export function untilReset(l: Limit, now: number): number | undefined {
472  if (!l.resetsAt) return undefined
473  const t = Date.parse(l.resetsAt)
474  return Number.isFinite(t) ? Math.max(0, t - now) : undefined
475}
476
477/** The length of a window in ms, for burn-rate math. */
478export function windowMs(kind: string): number | undefined {
479  if (kind === 'five_hour') return 5 * 3600_000
480  if (kind === 'seven_day') return 7 * 24 * 3600_000
481  return undefined
482}
483
484// ---------------------------------------------------------------------------
485// Tool calls, described in a few words.
486
487/** What a tool call is about: the command, the file, the pattern, the agent's task. */
488export function toolDetail(tool: string, input: unknown): string {
489  const e = (input ?? {}) as Record<string, unknown>
490  const s = (k: string) => (typeof e[k] === 'string' ? (e[k] as string) : '')
491  const t = String(tool)
492  if (t === 'Bash' || t === 'PowerShell') return clip(s('description') || s('command'), 60)
493  if (s('file_path')) return baseName(s('file_path'))
494  if (s('notebook_path')) return baseName(s('notebook_path'))
495  if (t === 'Agent') return clip(s('description') || s('subagent_type'), 60)
496  if (s('pattern')) return clip(s('pattern'), 60)
497  if (s('url')) return clip(s('url').replace(/^https?:\/\//, ''), 60)
498  if (s('query')) return clip(s('query'), 60)
499  if (s('subject')) return clip(s('subject'), 60)
500  if (Array.isArray(e.todos)) return `${(e.todos as unknown[]).length} todos`
501  if (t.startsWith('mcp__')) return t.split('__').slice(1).join(' · ')
502  return ''
503}
504
505/** `mcp__server__tool` → `server·tool`; built-ins unchanged. */
506export function toolName(tool: string): string {
507  const t = String(tool)
508  return t.startsWith('mcp__') ? t.split('__').slice(1).join('·') : t
509}
510

1// Lofi's pure parts: moods, the hour that picks one, the equalizer frame and
2// the desktop SVG. No `$` here.
3import type { LofiMood } from '../types'
4import { mix, svg, svgText } from './lib/kz.ts'
5
6export type { LofiMood }
7
8export const MOODS: readonly LofiMood[] = ['focus', 'deep', 'night', 'sunny']
9
10/** Tempo of each loop (as synthesized by tools/make-loops.mjs). */
11export const BPM: Record<LofiMood, number> = { focus: 78, deep: 68, night: 62, sunny: 86 }
12
13/** Two colors per mood: the low and the high end of the equalizer. */
14export const TINT: Record<LofiMood, [string, string]> = {
15  focus: ['#7c3aed', '#22d3ee'],
16  deep: ['#1e40af', '#818cf8'],
17  night: ['#6d28d9', '#f472b6'],
18  sunny: ['#f97316', '#fde047'],
19}
20
21export function isMood(x: unknown): x is LofiMood {
22  return typeof x === 'string' && (MOODS as readonly string[]).includes(x)
23}
24
25/** auto: sunny 06–11, focus 11–18, deep 18–22, night 22–06. */
26export function moodForHour(hour: number): LofiMood {
27  if (hour >= 6 && hour < 11) return 'sunny'
28  if (hour >= 11 && hour < 18) return 'focus'
29  if (hour >= 18 && hour < 22) return 'deep'
30  return 'night'
31}
32
33/** The `mood` option as a setting: `auto` unless it is text. */
34export function moodSettingOf(v: unknown): string {
35  return typeof v === 'string' ? v : 'auto'
36}
37
38export function resolveMood(setting: string, hour: number): LofiMood {
39  return isMood(setting) ? setting : moodForHour(hour)
40}
41
42export function assetOf(mood: LofiMood): string {
43  return `sounds/${mood}.wav`
44}
45
46/** 0..100 → the engine's linear gain (0..4); 40 → about half. */
47export function gainOf(volume: unknown): number {
48  const v = typeof volume === 'number' && Number.isFinite(volume) ? Math.max(0, Math.min(100, volume)) : 40
49  return Math.round((v / 100) * 1.25 * 100) / 100
50}
51
52const BARS = ' ▁▂▃▄▅▆▇█'
53
54/** Equalizer heights 0..1 for `n` bands at frame `t` (30 fps): a beat bump over drifting sines. */
55export function eqLevels(n: number, t: number, bpm: number): number[] {
56  const beat = (t / 30) * (bpm / 60)
57  const bump = Math.exp(-(beat % 1) * 5)
58  return Array.from({ length: n }, (_, i) => {
59    const low = 1 - i / Math.max(1, n - 1)
60    const wave = 0.35 + 0.25 * Math.sin(t * 0.11 + i * 1.7) + 0.2 * Math.sin(t * 0.23 + i * 0.6)
61    return Math.max(0.05, Math.min(1, wave + bump * (0.25 + 0.35 * low)))
62  })
63}
64
65export function eqBars(levels: readonly number[], mood: LofiMood): { s: string; c: string }[] {
66  const [lo, hi] = TINT[mood]
67  return levels.map(v => ({ s: BARS.charAt(Math.max(1, Math.min(8, Math.round(v * 8)))), c: mix(lo, hi, v) }))
68}
69
70/** One row: a pill with the note, `lofi · mood`, and bars dancing by CSS at the loop's tempo. */
71export function lofiSvg(mood: LofiMood, W: number, now: number, since: number): string {
72  const H = 30
73  const [lo, hi] = TINT[mood]
74  const beat = 60 / BPM[mood]
75  const n = 16
76  const label = `lofi · ${mood}`
77  const pillW = 128 + n * 6
78  const x0 = 116
79  const t = (now - since) / 1000
80  const bars: string[] = []
81  for (let i = 0; i < n; i++) {
82    const dur = beat * (i % 3 === 0 ? 1 : i % 3 === 1 ? 0.5 : 2)
83    const delay = -((t + i * 0.137) % dur)
84    bars.push(`<rect class="eq" x="${x0 + i * 6}" y="6" width="4" height="18" rx="2" fill="url(#lfG)" style="animation-duration:${dur.toFixed(3)}s;animation-delay:${delay.toFixed(3)}s"/>`)
85  }
86  const css = `
87.eq{transform-box:fill-box;transform-origin:50% 100%;animation:eq ease-in-out infinite alternate}
88@keyframes eq{0%{transform:scaleY(.18)}55%{transform:scaleY(1)}100%{transform:scaleY(.4)}}
89.nt{animation:nt ${(beat * 2).toFixed(2)}s ease-in-out infinite}@keyframes nt{50%{transform:translateY(-2px)}}
90.rim{stroke:${lo};stroke-opacity:.35}`
91  const body = `<defs><linearGradient id="lfG" x1="0" y1="1" x2="0" y2="0"><stop offset="0" stop-color="${lo}"/><stop offset="1" stop-color="${hi}"/></linearGradient></defs>
92<rect class="p" x="0" y="1" width="${Math.min(W, pillW)}" height="28" rx="14"/>
93<rect class="rim" x=".5" y="1.5" width="${Math.min(W, pillW) - 1}" height="27" rx="13.5" fill="none"/>
94<g class="nt">${svgText(12, 20, '♪', { size: 15, weight: 700, fill: hi })}</g>
95${svgText(30, 19.5, label, { size: 12, weight: 650 })}
96${bars.join('')}`
97  return svg(W, H, body, css)
98}
99

1// Lofi's terminal band: one row, a bobbing note, `lofi · mood` and an
2// equalizer that bumps on the loop's beat. ~30 fps on the surface; no `$`.
3import type { ClientModule, ClientSurface } from 'claude-code'
4
5import { BPM, TINT, eqBars, eqLevels, isMood } from './mood.ts'
6
7export type EqProps = { mood: string; bands: number }
8type S = { t: number }
9
10/** The first frame: state at 0 and a ~30 fps tick that counts frames. */
11function start(surface: ClientSurface<S>): S {
12  let frame = 0
13  surface.setState({ t: frame })
14  surface.every(33, () => surface.setState({ t: ++frame }))
15  return { t: frame }
16}
17
18const Eq: ClientModule<EqProps, S> = (props, surface) => {
19  const { t } = surface.state ?? start(surface)
20  const mood = isMood(props.mood) ? props.mood : 'focus'
21  const bpm = BPM[mood]
22  const beat = Math.floor((t / 30) * (bpm / 60))
23  const bars = eqBars(eqLevels(Math.max(4, props.bands), t, bpm), mood)
24  const [, hi] = TINT[mood]
25  const { Text } = surface.elements
26  return (
27    <Text wrap="truncate-end">
28      <Text color={hi} bold>{beat % 2 ? '♫' : '♪'}</Text>
29      <Text> lofi</Text>
30      <Text dimColor> · </Text>
31      <Text color={hi}>{mood}</Text>
32      <Text>  </Text>
33      {bars.map((b, i) => (
34        <Text key={`b${i}`} color={b.c}>{b.s}</Text>
35      ))}
36    </Text>
37  )
38}
39
40export default Eq
41

1export type LofiMood = 'focus' | 'deep' | 'night' | 'sunny'
2
3export type LofiSnap = {
4  /** True while a loop is playing. */
5  isPlaying: boolean
6  /** The mood playing, or the one that would. */
7  mood: LofiMood
8  /** Music is opt-in: `/lofi on`. */
9  isEnabled: boolean
10  /** The clock when the loop started (ms); the desktop bars keep their phase from it. */
11  since: number
12}
13
14declare module 'claude-code' {
15  interface PluginState {
16    lofi: { snap: LofiSnap | null; isHidden: boolean }
17  }
18}
19