ballast

1import { atom, read, update } from 'claude-code'
2import type { EngineInterface, Register } from 'claude-code'
3
4import type { BallastSnap } from '../types'
5import { KZ, clamp01, fitText, fmtPct, fmtTokens, heat, mix, pxOf, svg, svgText } from './lib/kz.ts'
6import { compactedText, errorText } from './text.ts'
7
8const SNOOZE_POINTS = 4
9const AUTO_GAP_MS = 60_000
10
11const blank = (warnAt: number, actAt: number, autoCompact: boolean): BallastSnap => ({
12  percent: null,
13  tokens: null,
14  window: 1_000_000,
15  warnAt,
16  actAt,
17  autoCompact,
18  isWorking: false,
19  isQueued: false,
20  isCompacting: false,
21  snoozedAt: null,
22  last: null,
23})
24
25const snapAtom = atom({ plugin: 'ballast', key: 'snap' } as const, blank(75, 88, false))
26const hiddenAtom = atom({ plugin: 'ballast', key: 'isHidden' } as const, false)
27
28// ---------------------------------------------------------------------------
29// The live coach. Module state starts over on a reload; session.start fills it.
30
31let live: BallastSnap = blank(75, 88, false)
32let hasWarned = false
33let isAutoArmed = true
34let lastAutoAt = 0
35let publishedKey = ''
36
37async function publish($: EngineInterface): Promise<void> {
38  const key = JSON.stringify(live)
39  if (key === publishedKey) return
40  publishedKey = key
41  const copy: BallastSnap = { ...live, last: live.last ? { ...live.last } : null }
42  await update($, snapAtom, () => copy)
43}
44
45async function observe($: EngineInterface, percent: number | undefined, tokens: number | undefined, window: number): Promise<void> {
46  if (percent === undefined || !Number.isFinite(percent)) return
47  live.percent = Math.round(percent * 10) / 10
48  live.tokens = tokens ?? null
49  live.window = window || live.window
50  if (live.percent < live.warnAt) hasWarned = false
51  if (live.percent < live.actAt) isAutoArmed = true
52  if (live.snoozedAt !== null && live.percent < live.snoozedAt - SNOOZE_POINTS) live.snoozedAt = null
53  if (live.percent >= live.warnAt && live.percent < live.actAt && !hasWarned) {
54    hasWarned = true
55    $.ui.toast(`⚓ ballast: context at ${fmtPct(live.percent)} — plan a /compact before it fills`, { timeoutMs: 6000 })
56  }
57  if (live.percent >= live.actAt) hasWarned = true
58  if (live.autoCompact && live.percent >= live.actAt && isAutoArmed && !live.isCompacting) {
59    const now = await $.clock.now()
60    if (now - lastAutoAt > AUTO_GAP_MS) {
61      isAutoArmed = false
62      lastAutoAt = now
63      if (live.isWorking) live.isQueued = true
64      else $.clock.after(250, () => void compactNow($).catch(() => undefined))
65    }
66  }
67  await publish($)
68}
69
70async function sample($: EngineInterface): Promise<void> {
71  try {
72    const u = await $.session.usage()
73    await observe($, u.context.percent, u.context.tokens, u.context.window)
74  } catch {
75    // Keep the last reading.
76  }
77}
78
79/** Compacts now between turns, or queues it for the end of the running turn. */
80async function compactNow($: EngineInterface): Promise<string> {
81  if (live.isCompacting) return 'Already compacting.'
82  if (live.isWorking) {
83    live.isQueued = true
84    await publish($)
85    $.ui.toast('⚓ ballast: compaction queued for the end of this turn')
86    return 'Queued: ballast compacts when this turn ends.'
87  }
88  live.isQueued = false
89  live.isCompacting = true
90  const before = live.tokens
91  try {
92    // Inside the try, so a refused state write cannot leave isCompacting stuck.
93    await publish($)
94    const r = await $.session.compact()
95    live.isCompacting = false
96    if (r.skip !== undefined) {
97      $.ui.toast(`⚓ ballast: compaction skipped — ${r.skip}`)
98      await publish($)
99      return `Compaction skipped: ${r.skip}`
100    }
101    await sample($)
102    const b = r.tokensBefore ?? before
103    const a = r.tokensAfter ?? live.tokens
104    live.last = { before: b, after: a, at: await $.clock.now(), by: 'ballast' }
105    live.snoozedAt = null
106    await publish($)
107    const text = compactedText(b, a)
108    $.ui.toast(text, { timeoutMs: 8000 })
109    return text
110  } catch (err) {
111    // A turn started under us: try again when it ends.
112    live.isCompacting = false
113    live.isQueued = true
114    await publish($)
115    return `Could not compact now (${errorText(err)}); queued for the end of the next turn.`
116  }
117}
118
119async function snooze($: EngineInterface): Promise<void> {
120  live.snoozedAt = live.percent
121  await publish($)
122}
123
124async function setHidden($: EngineInterface, isHidden: boolean): Promise<void> {
125  await update($, hiddenAtom, () => isHidden)
126  try {
127    await $.store.set('isHidden', isHidden)
128  } catch {
129    // Hidden for this session at least.
130  }
131}
132
133async function loadHidden($: EngineInterface): Promise<void> {
134  try {
135    const v = await $.store.get('isHidden')
136    if (typeof v === 'boolean') await update($, hiddenAtom, () => v)
137  } catch {
138    // Nothing stored yet.
139  }
140}
141
142async function setWorking($: EngineInterface, isWorking: boolean): Promise<void> {
143  live.isWorking = isWorking
144  await publish($)
145}
146
147async function afterTurn($: EngineInterface): Promise<void> {
148  await setWorking($, false)
149  await sample($)
150  if (live.isQueued && !live.isCompacting) await compactNow($)
151}
152
153async function noteCompaction($: EngineInterface, before: number | null, after: number | null, by: string): Promise<void> {
154  live.last = { before, after, at: await $.clock.now(), by }
155  live.snoozedAt = null
156  live.isQueued = false
157  await sample($)
158  if (live.last.after === null && live.tokens !== null) live.last.after = live.tokens
159  await publish($)
160  $.ui.toast(compactedText(before, live.last.after), { timeoutMs: 8000 })
161}
162
163const isBandDue = (s: BallastSnap): boolean =>
164  s.percent !== null && s.percent >= s.actAt && (s.snoozedAt === null || s.percent >= s.snoozedAt + SNOOZE_POINTS)
165
166export const register: Register = (on, options) => {
167  // The manifest fills in the defaults; a value that is not a number falls back to them.
168  const warnAt = Math.max(1, Math.min(99, Number(options.warnAt) || 75))
169  const actAt = Math.max(warnAt, Math.min(100, Number(options.actAt) || 88))
170  const autoCompact = options.autoCompact === true
171
172  on('session.start', async ($, e, next) => {
173    const started = await next(e)
174    live = blank(warnAt, actAt, autoCompact)
175    hasWarned = false
176    isAutoArmed = true
177    lastAutoAt = 0
178    publishedKey = ''
179    await $.command.register({ name: 'ballast', description: 'KOZMOS: the context coach band — toggle it; /ballast now compacts, /ballast status reports', argumentHint: '[now|status]', immediate: true })
180    await loadHidden($)
181    await sample($)
182    return started
183  })
184
185  on('command.run', { command: 'ballast' }, async ($, e) => {
186    const arg = e.args.trim().toLowerCase()
187    if (arg === 'now' || arg === 'compact') {
188      if (live.isCompacting || live.isWorking) return { text: await compactNow($) }
189      // The host refuses a compaction under the command.run hook that asks for
190      // it: start it just after this hook has answered.
191      $.clock.after(250, () => void compactNow($).catch(() => undefined))
192      return { text: '⚓ ballast: compacting now; a toast shows before → after.' }
193    }
194    if (arg === 'status') {
195      await sample($)
196      const last = live.last ? ` Last compaction: ${compactedText(live.last.before, live.last.after).replace('⚓ ', '')} (${live.last.by}).` : ''
197      return { text: `⚓ ballast: context ${fmtPct(live.percent ?? undefined)} (${fmtTokens(live.tokens ?? 0)} of ${fmtTokens(live.window)}); warn at ${warnAt}%, act at ${actAt}%, auto-compact ${autoCompact ? 'on' : 'off'}.${last}` }
198    }
199    const isHidden = !(await read($, hiddenAtom))
200    await setHidden($, isHidden)
201    return { text: isHidden ? 'ballast band hidden. /ballast shows it again.' : 'ballast band shown: it appears when the context passes ' + actAt + '%.' }
202  })
203
204  on('session.measure', async ($, e, next) => {
205    const r = await next(e)
206    if (e.changed.includes('context')) await observe($, e.context.percent, e.context.tokens, e.context.window)
207    return r
208  }).catch(($, e, next) => next(e))
209
210  on('turn.start', async ($, e, next) => {
211    await setWorking($, true)
212    return next(e)
213  })
214
215  on('turn.complete', async ($, e, next) => {
216    const r = await next(e)
217    // Between turns only: the queued compaction runs once this turn has ended.
218    if (e.agentId === undefined) $.clock.after(300, () => void afterTurn($).catch(() => undefined))
219    return r
220  })
221
222  // Every other compaction (/compact, the engine's own): toast before → after.
223  on('session.compact', async ($, e, next) => {
224    const r = await next(e)
225    if (e.trigger !== 'precompute' && e.agentId === undefined && r.skip === undefined) {
226      void noteCompaction($, r.tokensBefore ?? live.tokens, r.tokensAfter ?? null, e.trigger === 'manual' ? 'you' : e.trigger).catch(() => undefined)
227    }
228    return r
229  }).catch(($, e, next) => next(e))
230
231  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
232    const drawn = await next(e)
233    if (e.props.hasSurvey || (await read($, hiddenAtom))) return drawn
234    const s = await read($, snapAtom)
235    if (!isBandDue(s) && !s.isQueued && !s.isCompacting) return drawn
236    const ui = $.ui.resolve(e)
237    const cols = Math.max(30, e.props.bodyColumns || 80)
238    const pct = s.percent ?? 0
239    const status = s.isCompacting ? 'compacting…' : s.isQueued ? 'compaction queued for the end of this turn' : 'compact before the next big task'
240    const head = `⚓ ctx ${fmtPct(pct)} — ${status}`
241    const onCompact = () => void compactNow($).catch(() => undefined)
242    const onSnooze = () => void snooze($).catch(() => undefined)
243    const { Box, Button } = ui
244    const buttons = [
245      !s.isCompacting && !s.isQueued ? <Button key="ballast-compact" label="Compact now" onPress={onCompact} /> : null,
246      !s.isCompacting ? <Button key="ballast-snooze" label="Not now" plain onPress={onSnooze} /> : null,
247      <Button key="ballast-hide" label="✕" plain dimColor role="dismiss" onPress={() => void setHidden($, true)} />,
248    ]
249
250    if ('Svg' in ui && e.surface !== 'terminal') {
251      const { Svg } = ui
252      const W = Math.max(260, pxOf(cols) - 250)
253      return (
254        <Box flexDirection="column">
255          {drawn}
256          <Box key="ballast" flexDirection="row" alignItems="center" gap={1}>
257            <Svg source={bandSvg(W, s, status)} alt={`${head}; ${fmtTokens(s.tokens ?? 0)} of ${fmtTokens(s.window)} tokens`} width={W} height={56} />
258            {buttons}
259          </Box>
260        </Box>
261      )
262    }
263
264    const { Text } = ui
265    const gaugeW = Math.max(10, Math.min(60, cols - 24))
266    return (
267      <Box flexDirection="column">
268        {drawn}
269        <Box key="ballast" flexDirection="column">
270          <Box flexDirection="row" justifyContent="space-between">
271            <Text wrap="truncate-end">
272              <Text bold color={heat(pct / 100)}>{head}</Text>
273            </Text>
274            <Box flexDirection="row" gap={1}>{buttons}</Box>
275          </Box>
276          <Text wrap="truncate-end">
277            {waterLine(pct, s.warnAt, s.actAt, gaugeW).map(r => <Text key={r.key} color={r.color}>{r.ch}</Text>)}
278            <Text dimColor> {fmtTokens(s.tokens ?? 0)}/{fmtTokens(s.window)}</Text>
279          </Text>
280        </Box>
281      </Box>
282    )
283  })
284}
285
286/** The terminal gauge: a waterline with marks at warnAt and actAt. */
287function waterLine(pct: number, warnAt: number, actAt: number, width: number): Run[] {
288  const fill = Math.round(clamp01(pct / 100) * width)
289  const warnCol = Math.round((warnAt / 100) * width)
290  const actCol = Math.round((actAt / 100) * width)
291  const out: Run[] = [textRun('▕', KZ.mist, 'l')]
292  for (let i = 0; i < width; i++) {
293    const isMark = i === warnCol || i === actCol
294    if (i < fill) out.push(textRun(i % 2 ? '≈' : '~', mix(KZ.cyan, heat(pct / 100), i / Math.max(1, width)), `w${i}`))
295    else out.push(textRun(isMark ? '┊' : '·', isMark ? (i === actCol ? KZ.red : KZ.yellow) : KZ.mist, `w${i}`))
296  }
297  out.push(textRun('▏', KZ.mist, 'r'))
298  return out
299}
300
301type Run = { ch: string; color: string; key: string }
302
303function textRun(ch: string, color: string, key: string): Run {
304  return { ch, color, key }
305}
306
307/** The desktop band: an anchor, the words, and a tank whose water rises with the context. */
308function bandSvg(W: number, s: BallastSnap, status: string): string {
309  const pct = s.percent ?? 0
310  const level = clamp01(pct / 100)
311  const c = heat(level)
312  const tankW = Math.min(220, Math.max(110, W * 0.32))
313  const tankX = W - tankW - 10
314  const tankY = 6
315  const tankH = 44
316  const waterY = tankY + tankH * (1 - level)
317  const markY = (p: number) => tankY + tankH * (1 - p / 100)
318  const wave = (amp: number, len: number, y: number) => {
319    let d = `M${tankX - len} ${y}`
320    for (let x = tankX - len; x < tankX + tankW + len; x += len) d += ` q${len / 4} ${-amp} ${len / 2} 0 t${len / 2} 0`
321    return `${d} V${tankY + tankH + 4} H${tankX - len} Z`
322  }
323  const textW = tankX - 64
324  const css = `.wv1{animation:bwave 3.2s linear infinite}.wv2{animation:bwave 5s linear infinite reverse;opacity:.55}
325@keyframes bwave{to{transform:translateX(36px)}}
326.sway{transform-box:fill-box;transform-origin:50% 10%;animation:bsway 4s ease-in-out infinite}@keyframes bsway{50%{transform:rotate(-7deg)}}`
327  const body = `<defs><clipPath id="btank"><rect x="${tankX}" y="${tankY}" width="${tankW}" height="${tankH}" rx="9"/></clipPath>
328<linearGradient id="bwater" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="${mix(KZ.cyan, c, 0.55)}"/><stop offset="1" stop-color="${KZ.blue}" stop-opacity=".85"/></linearGradient></defs>
329<rect class="p" x="0" y="0" width="${W}" height="56" rx="12"/>
330<g class="sway" transform="translate(14 8)" fill="none" stroke="${c}" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round">
331<circle cx="15" cy="5" r="3.6"/><path d="M15 9v28M8 15h14M3 26c1 7 6 11 12 11s11-4 12-11M3 26l-2 3M3 26l3.5 1.2M27 26l2 3M27 26l-3.5 1.2"/></g>
332${svgText(56, 24, `ctx ${fmtPct(pct)}`, { size: 16, weight: 750, fill: c })}
333${svgText(56 + 82, 24, fitText(`— ${status}`, 12.5, Math.max(40, textW - 82)), { cls: 't', size: 12.5, weight: 600 })}
334${svgText(56, 43, fitText(`${fmtTokens(s.tokens ?? 0)} of ${fmtTokens(s.window)} tokens · warn ${s.warnAt}% · act ${s.actAt}%${s.autoCompact ? ' · auto-compact' : ''}`, 11, textW), { cls: 'm', size: 11 })}
335<rect class="k" x="${tankX}" y="${tankY}" width="${tankW}" height="${tankH}" rx="9"/>
336<g clip-path="url(#btank)">
337<path class="wv2" d="${wave(2.6, 36, waterY + 1.5)}" fill="${KZ.blue}"/>
338<path class="wv1" d="${wave(3.2, 36, waterY)}" fill="url(#bwater)"/>
339</g>
340<line x1="${tankX + 4}" x2="${tankX + tankW - 4}" y1="${markY(s.warnAt)}" y2="${markY(s.warnAt)}" stroke="${KZ.yellow}" stroke-dasharray="3 3" stroke-width="1.2"/>
341<line x1="${tankX + 4}" x2="${tankX + tankW - 4}" y1="${markY(s.actAt)}" y2="${markY(s.actAt)}" stroke="${KZ.red}" stroke-dasharray="3 3" stroke-width="1.2"/>
342<rect x="${tankX}" y="${tankY}" width="${tankW}" height="${tankH}" rx="9" fill="none" stroke="${c}" stroke-opacity=".6" stroke-width="1.4"/>
343${svgText(tankX + tankW - 8, tankY + 15, fmtPct(pct), { size: 12, weight: 700, anchor: 'end' })}`
344  return svg(W, 56, body, css)
345}
346

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// Ballast's words: pure, no `$`.
2import { fmtTokens } from './lib/kz.ts'
3
4/** The toast after a compaction: before → after when both are known. */
5export function compactedText(before: number | null, after: number | null): string {
6  if (before && after !== null) {
7    const cut = Math.round((1 - after / before) * 100)
8    return `⚓ compacted: ${fmtTokens(before)} → ${fmtTokens(after)} tokens (−${Math.max(0, cut)}%)`
9  }
10  if (after !== null) return `⚓ compacted: now ${fmtTokens(after)} tokens`
11  return '⚓ compacted.'
12}
13
14/** A failure as one line of text. */
15export function errorText(err: unknown): string {
16  return err instanceof Error ? err.message : String(err)
17}
18

1export type BallastCompaction = {
2  /** Tokens in the window before and after; null when the engine did not say. */
3  before: number | null
4  after: number | null
5  at: number
6  /** Who compacted: `you` (/compact), `auto` (the engine), `ballast`. */
7  by: string
8}
9
10export type BallastSnap = {
11  /** The context fill, 0-100, or null before the first reading. */
12  percent: number | null
13  tokens: number | null
14  window: number
15  warnAt: number
16  actAt: number
17  autoCompact: boolean
18  isWorking: boolean
19  /** A compaction asked for while a turn ran, waiting for turn.complete. */
20  isQueued: boolean
21  isCompacting: boolean
22  /** "Not now" at this percent: the band rests until the fill grows 4 points. */
23  snoozedAt: number | null
24  last: BallastCompaction | null
25}
26
27declare module 'claude-code' {
28  interface PluginState {
29    ballast: { snap: BallastSnap; isHidden: boolean }
30  }
31}
32