halo

1import { atom, read, update } from 'claude-code'
2import type { EngineInterface, Register } from 'claude-code'
3
4import type { HaloSnap } from '../types'
5import type { LineProps } from './line.tsx'
6import { moodOf, WAITING_TOOLS } from './mood.ts'
7import type { SpinnerMode, StreamPhase } from './mood.ts'
8import { haloSvg } from './svg.ts'
9
10const snapAtom = atom({ plugin: 'halo', key: 'snap' } as const, null)
11const hiddenAtom = atom({ plugin: 'halo', key: 'isHidden' } as const, false)
12
13// The facts the mood is computed from. Module variables start over on a reload.
14//
15// The spinner's mode comes from a `ui.render` hook on the Spinner, and a render
16// hook must not write state. So that hook only stores the mode in a module
17// variable (`spinner`) and passes the drawing on untouched; a 400 ms timer and
18// every tool and turn event recompute the mood and publish it to $.state when
19// it changed. The model's own stream (turn.step chunks) is the first source;
20// the spinner fills in where no stream is in flight (the desktop's own words
21// for a step, a request the engine retries).
22let isWorking = false
23let phase: StreamPhase | undefined
24let spinner: { mode: SpinnerMode; at: number } | undefined
25const running = new Map<number, { tool: string; at: number }>()
26let toolSeq = 0
27let failedAt: number | undefined
28let published = ''
29
30async function publish($: EngineInterface): Promise<void> {
31  const now = await $.clock.now()
32  const tools = [...running.values()].sort((a, b) => b.at - a.at)
33  const mood = moodOf({
34    now,
35    isWorking,
36    tool: tools.find(t => !WAITING_TOOLS.includes(t.tool))?.tool,
37    isWaiting: tools.some(t => WAITING_TOOLS.includes(t.tool)),
38    failedAt,
39    phase,
40    spinner,
41  })
42  const key = `${mood.mood}|${mood.color}|${mood.label}`
43  if (key === published) return
44  published = key
45  const snap: HaloSnap = { ...mood, since: now }
46  await update($, snapAtom, () => snap)
47}
48
49async function setHidden($: EngineInterface, isHidden: boolean): Promise<void> {
50  await update($, hiddenAtom, () => isHidden)
51  try {
52    await $.store.set('isHidden', isHidden)
53  } catch {
54    // Hidden for this session only.
55  }
56}
57
58async function loadHidden($: EngineInterface): Promise<void> {
59  try {
60    const v = await $.store.get('isHidden')
61    if (typeof v === 'boolean') await update($, hiddenAtom, () => v)
62  } catch {
63    // Nothing stored.
64  }
65}
66
67export const register: Register = on => {
68  on('session.start', async ($, e, next) => {
69    const started = await next(e)
70    isWorking = false
71    phase = undefined
72    spinner = undefined
73    running.clear()
74    failedAt = undefined
75    published = ''
76    await $.command.register({ name: 'halo', description: 'KOZMOS: show or hide the Halo mood line above the prompt', immediate: true })
77    await loadHidden($)
78    await publish($)
79    $.clock.every(400, () => void publish($).catch(() => undefined))
80    return started
81  })
82
83  on('command.run', { command: 'halo' }, async $ => {
84    const isHidden = !(await read($, hiddenAtom))
85    await setHidden($, isHidden)
86    return { text: isHidden ? 'Halo hidden. /halo brings it back.' : 'Halo shown.' }
87  })
88
89  on('turn.start', async ($, e, next) => {
90    isWorking = true
91    phase = undefined
92    await publish($)
93    return next(e)
94  })
95
96  on('turn.complete', async ($, e, next) => {
97    if (e.agentId === undefined) {
98      isWorking = false
99      phase = undefined
100      spinner = undefined
101      await publish($)
102    }
103    return next(e)
104  })
105
106  // The main loop's request as it streams: requesting until the first chunk,
107  // then thinking, writing or calling a tool by the chunk's kind.
108  on('turn.step', async function* ($, e, next) {
109    if (e.agentId !== undefined) return yield* next(e)
110    phase = 'requesting'
111    void publish($).catch(() => undefined)
112    const stream = next(e)
113    try {
114      let item = await stream.next()
115      while (!item.done) {
116        const c = item.value
117        const now: StreamPhase | undefined = c.kind === 'thinking' ? 'thinking' : c.kind === 'text' ? 'responding' : c.kind === 'tool' || c.kind === 'input' ? 'tool-input' : undefined
118        if (now && now !== phase) {
119          phase = now
120          void publish($).catch(() => undefined)
121        }
122        yield c
123        item = await stream.next()
124      }
125      return item.value
126    } finally {
127      phase = undefined
128    }
129  })
130
131  on('tool.call', async ($, e, next) => {
132    const id = ++toolSeq
133    running.set(id, { tool: String(e.tool), at: await $.clock.now() })
134    await publish($)
135    try {
136      const ran = await next(e)
137      if (ran.isError === true || ran.deny !== undefined) failedAt = await $.clock.now()
138      return ran
139    } finally {
140      running.delete(id)
141      // The 400 ms timer ends the red flash once ERROR_MS has passed.
142      void publish($).catch(() => undefined)
143    }
144  }).catch(($, e, next) => next(e))
145
146  // Reads the spinner's mode and draws nothing of its own.
147  on('ui.render', { component: 'Spinner' }, async ($, e, next) => {
148    spinner = { mode: e.props.mode, at: await $.clock.now() }
149    return next(e)
150  })
151
152  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
153    const drawn = await next(e)
154    if (e.props.hasSurvey || (await read($, hiddenAtom))) return drawn
155    const snap = await read($, snapAtom)
156    if (!snap) return drawn
157    const cols = Math.max(20, (e.props.bodyColumns || 80) - 3)
158
159    if (e.surface === 'terminal') {
160      const { Box, Button, Client } = $.ui.resolve(e)
161      const props: LineProps = { mood: snap.mood, color: snap.color, label: snap.label }
162      return (
163        <Box flexDirection="column">
164          {drawn}
165          <Box key="halo" flexDirection="row">
166            <Client key="halo-line" module="./line.tsx" width={cols} height={1} props={props} />
167            <Button key="halo-hide" label="✕" plain dimColor role="dismiss" onPress={() => void setHidden($, true)} />
168          </Box>
169        </Box>
170      )
171    }
172
173    // Every surface but the terminal draws an Svg.
174    const { Box, Button, Svg } = $.ui.resolve(e)
175    const pic = haloSvg(snap, cols * 8 - 8, await $.clock.now())
176    return (
177      <Box flexDirection="column">
178        {drawn}
179        <Box key="halo" flexDirection="row">
180          <Svg source={pic.source} alt={pic.alt} width={pic.width} height={pic.height} />
181          <Button key="halo-hide" label="✕" plain dimColor role="dismiss" onPress={() => void setHidden($, true)} />
182        </Box>
183      </Box>
184    )
185  })
186}
187

1// Halo's terminal line: a Client surface module that paints one row of ━ at
2// ~30 fps, every cell its own color, in a pattern per mood.
3import type { ClientModule, RenderElement } from 'claude-code'
4
5import type { HaloMood } from '../types'
6import { mix, noise } from './lib/kz.ts'
7
8export type LineProps = { mood: HaloMood; color: string; label: string }
9
10type LineState = { t: number; moodT: number; mood: HaloMood }
11
12/** A gray that reads on dark and light terminals alike: the line's "off". */
13const OFF = '#4b5563'
14
15let latest: LineProps = { mood: 'idle', color: '#60a5fa', label: '' }
16
17/** The color of cell `x` of `w` at frame `t` (`m` frames into the mood). */
18export function cellColor(p: LineProps, x: number, w: number, t: number, m: number): string {
19  const c = p.color
20  switch (p.mood) {
21    case 'idle': {
22      // Slow breathing with a faint swell drifting along.
23      const breath = 0.45 + 0.3 * Math.sin(t * 0.045)
24      const swell = 0.12 * Math.sin(x * 0.06 - t * 0.02)
25      return mix(OFF, c, Math.max(0, Math.min(1, breath + swell)))
26    }
27    case 'flow': {
28      // Bands of violet streaming right.
29      const k = 0.5 + 0.5 * Math.sin((x - t * 0.9) * 0.11)
30      return mix(mix(c, '#5b21b6', 0.55), mix(c, '#f5f3ff', 0.45), k)
31    }
32    case 'think': {
33      // A magenta field with sparks that come and go.
34      const base = 0.55 + 0.15 * Math.sin(x * 0.2 + t * 0.07)
35      const spark = noise(x, Math.floor(t / 3)) > 0.9 ? 1 : 0
36      return spark ? mix(c, '#fff0fa', 0.7) : mix(OFF, c, base)
37    }
38    case 'tool': {
39      // A comet of the tool's color racing left to right.
40      const head = (t * 1.6) % (w + 30)
41      const d = head - x
42      const tail = d >= 0 ? Math.exp(-d / 10) : 0
43      return mix(mix(OFF, c, 0.3), mix(c, '#ffffff', 0.35), tail)
44    }
45    case 'error': {
46      // A hard red strobe that settles over four seconds.
47      const fade = Math.max(0, 1 - m / 120)
48      const strobe = Math.floor(m / 4) % 2 === 0 ? 1 : 0.35
49      return mix(mix(OFF, c, 0.45), c, fade * strobe + (1 - fade) * 0.4)
50    }
51    case 'wait': {
52      // An amber blink, once a second, with a soft edge.
53      const phase = (t % 30) / 30
54      const on = phase < 0.55 ? 1 : phase < 0.65 ? 1 - (phase - 0.55) * 10 : 0.15
55      return mix(OFF, c, on)
56    }
57  }
58}
59
60const Line: ClientModule<LineProps, LineState> = (props, surface) => {
61  if (surface.state === undefined) {
62    surface.setState({ t: 0, moodT: 0, mood: props.mood })
63    surface.every(33, () => {
64      const s = surface.state
65      if (!s) return
66      const isNew = latest.mood !== s.mood
67      surface.setState({ t: s.t + 1, moodT: isNew ? 0 : s.moodT + 1, mood: latest.mood })
68    })
69  }
70  latest = props
71  const st = surface.state ?? { t: 0, moodT: 0, mood: props.mood }
72  const { Text } = surface.elements
73  const w = Math.max(4, surface.columns || 80)
74  const label = props.label ? ` ${props.label} ` : ''
75  const lead = label ? 2 : 0
76  const parts: RenderElement[] = []
77  let run = ''
78  let runColor = ''
79  const flush = (key: string) => {
80    if (run) parts.push(<Text key={key} color={runColor}>{run}</Text>)
81    run = ''
82  }
83  for (let x = 0; x < w; x++) {
84    if (label && x === lead) {
85      flush(`r${x}`)
86      parts.push(<Text key="label" color={cellColor(props, x, w, st.t, st.moodT)} bold>{label}</Text>)
87      x += label.length - 1
88      continue
89    }
90    const color = cellColor(props, x, w, st.t, st.moodT)
91    if (color !== runColor) flush(`r${x}`)
92    runColor = color
93    run += '━'
94  }
95  flush('end')
96  return <Text wrap="truncate-end">{parts}</Text>
97}
98
99export default Line
100

1// Halo's state machine: which mood the line shows, from plain facts. No `$`.
2import type { HaloMood } from '../types'
3import { KZ, toolColor } from './lib/kz.ts'
4
5export const ERROR_MS = 4000
6export const SPINNER_FRESH_MS = 2500
7
8/** Tools whose call means Claude is waiting on the person. */
9export const WAITING_TOOLS: readonly string[] = ['AskUserQuestion', 'ExitPlanMode']
10
11export type StreamPhase = 'requesting' | 'thinking' | 'responding' | 'tool-input'
12export type SpinnerMode = 'requesting' | 'responding' | 'thinking' | 'tool-input' | 'tool-use'
13
14export type MoodFacts = {
15  now: number
16  isWorking: boolean
17  /** The newest running tool, if any (main loop or agent). */
18  tool?: string
19  /** A tool that waits on the person is running. */
20  isWaiting: boolean
21  failedAt?: number
22  /** The main loop's model request as it streams, if one is in flight. */
23  phase?: StreamPhase
24  /** The spinner's mode as last drawn, and when. */
25  spinner?: { mode: SpinnerMode; at: number }
26}
27
28export type Mood = { mood: HaloMood; color: string; label: string }
29
30export const IDLE: Mood = { mood: 'idle', color: KZ.blue, label: '' }
31
32/** Waiting beats a failure beats a running tool beats the model's own phase. */
33export function moodOf(f: MoodFacts): Mood {
34  if (f.isWaiting) return { mood: 'wait', color: KZ.amber, label: 'waiting for you' }
35  if (f.failedAt !== undefined && f.now - f.failedAt < ERROR_MS) return { mood: 'error', color: KZ.red, label: 'tool failed' }
36  if (f.tool) return { mood: 'tool', color: toolColor(f.tool), label: f.tool.startsWith('mcp__') ? f.tool.split('__').slice(1).join('·') : f.tool }
37  if (!f.isWorking) return IDLE
38  const fresh = f.spinner && f.now - f.spinner.at < SPINNER_FRESH_MS ? f.spinner.mode : undefined
39  const phase = f.phase ?? fresh
40  if (phase === 'thinking') return { mood: 'think', color: KZ.magenta, label: 'thinking' }
41  if (phase === 'responding') return { mood: 'flow', color: KZ.violet, label: 'writing' }
42  if (phase === 'tool-input' || phase === 'tool-use') return { mood: 'flow', color: KZ.violet, label: 'calling a tool' }
43  return { mood: 'flow', color: KZ.violet, label: 'requesting' }
44}
45

1// Halo's desktop line: one SVG, every motion a CSS animation.
2import type { HaloSnap } from '../types'
3import { mix, svg, svgText, textWidth } from './lib/kz.ts'
4
5const H = 16
6
7export function haloSvg(s: HaloSnap, width: number, now: number): { source: string; width: number; height: number; alt: string } {
8  const W = Math.max(120, width)
9  const c = s.color
10  const labelW = s.label ? textWidth(s.label, 10) + 14 : 0
11  const x0 = labelW
12  const lw = W - x0
13  const y = H / 2
14  const p: string[] = []
15  const css: string[] = []
16  p.push(`<defs><filter id="hg" x="-5%" y="-200%" width="110%" height="500%"><feGaussianBlur stdDeviation="2.4"/></filter>`)
17  p.push(`<clipPath id="hc"><rect x="${x0}" y="${y - 2}" width="${lw}" height="4" rx="2"/></clipPath>`)
18  p.push(`<clipPath id="hcg"><rect x="${x0 - 4}" y="0" width="${lw + 8}" height="${H}"/></clipPath>`)
19  const line = (fill: string, extra = '') => `<rect x="${x0}" y="${y - 1.5}" width="${lw}" height="3" rx="1.5" fill="${fill}" ${extra}/>`
20
21  switch (s.mood) {
22    case 'idle': {
23      css.push('.br{animation:hbr 5s ease-in-out infinite}@keyframes hbr{50%{opacity:.35}}')
24      p.push(`</defs><g class="br"><g clip-path="url(#hcg)">${line(c, 'filter="url(#hg)" opacity=".6"')}</g>${line(c)}</g>`)
25      break
26    }
27    case 'flow': {
28      // A repeating violet gradient three widths long, sliding right forever.
29      const deep = mix(c, '#4c1d95', 0.5)
30      const light = mix(c, '#f5f3ff', 0.5)
31      p.push(`<linearGradient id="hf" gradientUnits="userSpaceOnUse" x1="0" y1="0" x2="180" y2="0" spreadMethod="repeat"><stop offset="0" stop-color="${deep}"/><stop offset=".5" stop-color="${light}"/><stop offset="1" stop-color="${deep}"/></linearGradient></defs>`)
32      css.push('.fl{animation:hfl 1.6s linear infinite}@keyframes hfl{from{transform:translateX(-180px)}to{transform:translateX(0)}}')
33      const band = `<rect class="fl" x="${x0}" y="0" width="${lw + 180}" height="${H}" fill="url(#hf)"/>`
34      p.push(`<g clip-path="url(#hcg)" filter="url(#hg)" opacity=".55"><g clip-path="url(#hc)">${band}</g></g><g clip-path="url(#hc)">${band}</g>`)
35      break
36    }
37    case 'think': {
38      css.push('.sh{animation:hsh 1.1s ease-in-out infinite}@keyframes hsh{from{transform:translateX(-80px)}to{transform:translateX(' + (lw + 80) + 'px)}}')
39      css.push('.sp{animation:hsp 1.4s ease-in-out infinite;opacity:0}@keyframes hsp{40%{opacity:1}80%{opacity:0}}')
40      p.push(`<linearGradient id="hs" x1="0" x2="1"><stop offset="0" stop-color="#fff" stop-opacity="0"/><stop offset=".5" stop-color="#fff" stop-opacity=".9"/><stop offset="1" stop-color="#fff" stop-opacity="0"/></linearGradient></defs>`)
41      p.push(`<g clip-path="url(#hcg)">${line(c, 'filter="url(#hg)" opacity=".7"')}</g>${line(c)}`)
42      p.push(`<g clip-path="url(#hc)"><rect class="sh" x="${x0}" y="0" width="80" height="${H}" fill="url(#hs)"/></g>`)
43      for (let i = 0; i < Math.min(28, Math.floor(lw / 40)); i++) {
44        const sx = x0 + ((i * 97.13) % lw)
45        p.push(`<circle class="sp" cx="${sx.toFixed(1)}" cy="${y + ((i % 3) - 1) * 2.5}" r="1.5" fill="${mix(c, "#ffffff", 0.7)}" style="animation-delay:${((i * 0.37) % 1.4).toFixed(2)}s"/>`)
46      }
47      break
48    }
49    case 'tool': {
50      // The tool's color dim along the line, and a bright comet racing across.
51      p.push(`<linearGradient id="ht" x1="0" x2="1"><stop offset="0" stop-color="${c}" stop-opacity="0"/><stop offset=".85" stop-color="${mix(c, '#ffffff', 0.25)}"/><stop offset="1" stop-color="${mix(c, "#ffffff", 0.55)}"/></linearGradient></defs>`)
52      css.push(`.cm{animation:hcm 1.3s cubic-bezier(.5,0,.5,1) infinite}@keyframes hcm{from{transform:translateX(-140px)}to{transform:translateX(${lw + 20}px)}}`)
53      p.push(line(c, 'opacity=".35"'))
54      p.push(`<g clip-path="url(#hcg)"><rect class="cm" x="${x0}" y="${y - 3}" width="140" height="6" rx="3" fill="url(#ht)" filter="url(#hg)"/></g>`)
55      p.push(`<g clip-path="url(#hc)"><rect class="cm" x="${x0}" y="0" width="140" height="${H}" fill="url(#ht)"/></g>`)
56      break
57    }
58    case 'error': {
59      // A strobe that runs for what is left of the four seconds, then rests.
60      const left = Math.max(0.2, 4 - (now - s.since) / 1000)
61      css.push(`.er{animation:her .22s steps(2,jump-none) ${Math.round(left / 0.22)}}@keyframes her{50%{opacity:.25}}`)
62      p.push(`</defs><g class="er"><g clip-path="url(#hcg)">${line(c, 'filter="url(#hg)"')}</g>${line(c)}</g>`)
63      break
64    }
65    case 'wait': {
66      css.push('.wt{animation:hwt 1s ease-in-out infinite}@keyframes hwt{0%,50%{opacity:1}65%,100%{opacity:.15}}')
67      p.push(`</defs><g class="wt"><g clip-path="url(#hcg)">${line(c, 'filter="url(#hg)"')}</g>${line(c)}</g>`)
68      break
69    }
70  }
71  if (s.label) p.push(svgText(0, y + 3.5, s.label, { size: 10, weight: 700, fill: c }))
72  return { source: svg(W, H, p.join(''), css.join('')), width: W, height: H, alt: altOf(s) }
73}
74
75export function altOf(s: HaloSnap): string {
76  return `Halo: ${s.mood === 'idle' ? 'idle' : s.label}`
77}
78

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/** What the halo says: idle, the model at work, thinking, a tool running, a failure, or waiting for the person. */
2export type HaloMood = 'idle' | 'flow' | 'think' | 'tool' | 'error' | 'wait'
3
4export type HaloSnap = {
5  mood: HaloMood
6  /** The mood's color (a tool's family color while one runs). */
7  color: string
8  /** A word or two for the mood: "thinking", "Bash", "waiting for you". */
9  label: string
10  /** When this mood began (ms). */
11  since: number
12}
13
14declare module 'claude-code' {
15  interface PluginState {
16    halo: { snap: HaloSnap | null; isHidden: boolean }
17  }
18}
19