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Monorepo for Aesthetic.Computer aesthetic.computer
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374// A measured footer slot, leased to Slab only while its native letters exist.import {mkdirSync, readFileSync, writeFileSync, renameSync, rmSync} from 'node:fs';import {join} from 'node:path';import {randomUUID} from 'node:crypto';
export class SlabHandle { constructor({directory, sessionId, pid = process.pid, enabled = true, changed = () => {}, now = Date.now}) { this.file = join(directory, `${sessionId}.json`); this.ack = this.file + '.ack'; this.sessionId = sessionId; this.pid = pid; this.changed = changed; this.now = now; this.layout = null; this.key = ''; this.ready = false; this.writtenAt = 0; this.background = null; this.hovered = false; this.enabled = enabled; if (enabled) { try { mkdirSync(directory, {recursive:true, mode:0o700}); } catch { this.enabled = false; } } if (this.enabled) { this.timer = setInterval(() => this.poll(), 500); this.timer.unref(); } } get readyLayout() { return this.ready ? this.layout : null; } update(layout) { if (!this.enabled) return; const key = JSON.stringify(layout); if (key === this.key) return; this.key = key; this.layout = layout; this.token = randomUUID(); this.setReady(false); if (layout) this.write(); else this.remove(); } setReady(ready) { if (this.ready === ready) return; this.ready = ready; queueMicrotask(this.changed); } setHovered(hovered) { if (this.hovered === hovered) return; this.hovered = hovered; if (this.enabled && this.layout) this.write(); } write() { const temp = this.file + '.tmp'; try { const at = this.now(); writeFileSync(temp, JSON.stringify({schema:1, sessionId:this.sessionId, pid:this.pid, token:this.token, at, ...this.layout, hovered:this.hovered}), {mode:0o600}); renameSync(temp, this.file); this.writtenAt = at; } catch { this.setReady(false); try { rmSync(temp, {force:true}); } catch {} } } poll() { try { const page = JSON.parse(readFileSync(this.file + '.palette', 'utf8')); const rgb = page.background; if (page.schema === 1 && page.sessionId === this.sessionId && Array.isArray(rgb) && rgb.length === 3 && rgb.every(n => Number.isFinite(n) && n >= 0 && n <= 255) && JSON.stringify(rgb) !== JSON.stringify(this.background)) { this.background = rgb; queueMicrotask(this.changed); } } catch {} if (!this.layout) return; if (this.now() - this.writtenAt >= 2000) this.write(); let ready = false; try { const text = readFileSync(this.ack, 'utf8'); if (text.length <= 4096) { const ack = JSON.parse(text), age = this.now() - ack.at; ready = ack.schema === 1 && ack.sessionId === this.sessionId && ack.token === this.token && Number.isFinite(age) && age >= -1000 && age < 3000; } } catch {} this.setReady(ready); } remove() { for (const file of [this.file, this.ack]) try { rmSync(file, {force:true}); } catch {} } close() { clearInterval(this.timer); this.layout = null; this.ready = false; this.remove(); }}