Initial stopwatch CLI

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2026-07-03 19:20:15 +00:00
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# stopwatch-cli
A minimal terminal stopwatch with an interactive TUI.
```
┌─────────────────────┐
│ 00:00:00.0 │
│ ● RUNNING │
└─────────────────────┘
[space] start/pause [r] reset [q] quit
```
## Install
```bash
npm install
```
## Run
```bash
# Build and run
npm run build
npm start
# Run directly (no build step)
npm run dev
```
## Test
```bash
npm test
```
## Key bindings
| Key | Action |
|---------|------------------|
| `space` | Start / Pause |
| `r` | Reset to zero |
| `q` | Quit |
| `ctrl+c`| Quit |
## Time format
Elapsed time is shown as `HH:MM:SS.d` where `d` is tenths of a second.
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{
"name": "stopwatch-cli",
"version": "1.0.0",
"description": "A minimal terminal stopwatch with TUI",
"type": "module",
"scripts": {
"build": "tsc",
"start": "node dist/index.js",
"dev": "tsx src/index.ts",
"test": "node --import tsx --test src/**/*.test.ts"
},
"devDependencies": {
"@types/node": "^22.0.0",
"tsx": "^4.19.0",
"typescript": "^5.6.0"
}
}
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import * as readline from 'readline';
import { Stopwatch, formatTime } from './stopwatch.js';
const sw = new Stopwatch();
const HIDE_CURSOR = '\x1b[?25l';
const SHOW_CURSOR = '\x1b[?25h';
const CLEAR = '\x1b[2J\x1b[H';
const BOLD = '\x1b[1m';
const DIM = '\x1b[2m';
const GREEN = '\x1b[32m';
const YELLOW = '\x1b[33m';
const CYAN = '\x1b[36m';
const RESET = '\x1b[0m';
function render(): void {
const time = formatTime(sw.getElapsedMs());
const running = sw.isRunning();
const stateLabel = running ? `${GREEN}● RUNNING${RESET}` : `${YELLOW}⏸ PAUSED ${RESET}`;
const out = [
CLEAR,
'',
` ${DIM}┌─────────────────────┐${RESET}`,
` ${DIM}${RESET} ${BOLD}${CYAN}${time}${RESET} ${DIM}${RESET}`,
` ${DIM}${RESET} ${stateLabel} ${DIM}${RESET}`,
` ${DIM}└─────────────────────┘${RESET}`,
'',
` ${DIM}[space]${RESET} start/pause ${DIM}[r]${RESET} reset ${DIM}[q]${RESET} quit`,
'',
].join('\n');
process.stdout.write(out);
}
function cleanup(): void {
clearInterval(timer);
process.stdout.write(SHOW_CURSOR + '\n');
}
readline.emitKeypressEvents(process.stdin);
if (process.stdin.isTTY) {
process.stdin.setRawMode(true);
}
process.stdin.on('keypress', (_str, key) => {
if (!key) return;
if ((key.ctrl && key.name === 'c') || key.name === 'q') {
cleanup();
process.exit(0);
} else if (key.name === 'space') {
sw.toggle();
render();
} else if (key.name === 'r') {
sw.reset();
render();
}
});
process.stdout.write(HIDE_CURSOR);
render();
const timer = setInterval(render, 100);
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import { test, describe, beforeEach } from 'node:test';
import assert from 'node:assert/strict';
import { Stopwatch, formatTime } from './stopwatch.js';
describe('formatTime', () => {
test('zero milliseconds', () => {
assert.equal(formatTime(0), '00:00:00.0');
});
test('100ms = one tenth', () => {
assert.equal(formatTime(100), '00:00:00.1');
});
test('999ms = nine tenths', () => {
assert.equal(formatTime(999), '00:00:00.9');
});
test('1 second', () => {
assert.equal(formatTime(1000), '00:00:01.0');
});
test('1 minute', () => {
assert.equal(formatTime(60_000), '00:01:00.0');
});
test('1 hour', () => {
assert.equal(formatTime(3_600_000), '01:00:00.0');
});
test('1h 23m 45s 600ms', () => {
const ms = (1 * 3600 + 23 * 60 + 45) * 1000 + 600;
assert.equal(formatTime(ms), '01:23:45.6');
});
test('hours over 99', () => {
assert.equal(formatTime(100 * 3_600_000), '100:00:00.0');
});
});
describe('Stopwatch', () => {
let sw: Stopwatch;
beforeEach(() => {
sw = new Stopwatch();
});
test('starts at zero, not running', () => {
assert.equal(sw.getElapsedMs(), 0);
assert.equal(sw.isRunning(), false);
});
test('toggle starts the stopwatch', () => {
sw.toggle();
assert.equal(sw.isRunning(), true);
});
test('toggle twice pauses it', () => {
sw.toggle();
sw.toggle();
assert.equal(sw.isRunning(), false);
});
test('elapsed time increases while running', async () => {
sw.toggle();
await new Promise(r => setTimeout(r, 50));
assert.ok(sw.getElapsedMs() > 0, 'elapsed should be > 0 while running');
});
test('elapsed time is preserved after pause', async () => {
sw.toggle();
await new Promise(r => setTimeout(r, 50));
sw.toggle(); // pause
const snapshot = sw.getElapsedMs();
await new Promise(r => setTimeout(r, 50));
assert.equal(sw.getElapsedMs(), snapshot, 'elapsed should not change while paused');
});
test('reset zeroes elapsed and stops', async () => {
sw.toggle();
await new Promise(r => setTimeout(r, 30));
sw.reset();
assert.equal(sw.getElapsedMs(), 0);
assert.equal(sw.isRunning(), false);
});
test('can restart after reset', () => {
sw.toggle();
sw.reset();
sw.toggle();
assert.equal(sw.isRunning(), true);
});
});
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export class Stopwatch {
private startTime: number | null = null;
private elapsed: number = 0;
private _running: boolean = false;
toggle(): void {
if (this._running) {
this.elapsed += Date.now() - this.startTime!;
this.startTime = null;
this._running = false;
} else {
this.startTime = Date.now();
this._running = true;
}
}
reset(): void {
this.startTime = null;
this.elapsed = 0;
this._running = false;
}
getElapsedMs(): number {
if (this._running && this.startTime !== null) {
return this.elapsed + (Date.now() - this.startTime);
}
return this.elapsed;
}
isRunning(): boolean {
return this._running;
}
}
export function formatTime(ms: number): string {
const tenths = Math.floor(ms / 100) % 10;
const totalSecs = Math.floor(ms / 1000);
const secs = totalSecs % 60;
const mins = Math.floor(totalSecs / 60) % 60;
const hours = Math.floor(totalSecs / 3600);
const hh = String(hours).padStart(2, '0');
const mm = String(mins).padStart(2, '0');
const ss = String(secs).padStart(2, '0');
return `${hh}:${mm}:${ss}.${tenths}`;
}
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{
"compilerOptions": {
"target": "ES2022",
"module": "NodeNext",
"moduleResolution": "NodeNext",
"outDir": "dist",
"rootDir": "src",
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"declaration": true
},
"include": ["src"],
"exclude": ["src/**/*.test.ts"]
}