Fixed file name typo

ansi-trunc.mjs

@@ -0,0 +1,121 @@
+#!/usr/bin/env node
+
+/* VIBE ALERT
+
+This code was generated using OpenAI’s ChatGPT (GPT-5.2 Thinking, large language model).
+The output has not been independently reviewed, audited, or comprehensively validated,
+and has only been superficially tested. It should be considered experimental and not fully vetted for production use.
+
+*/
+
+import fs from 'node:fs';
+import readline from 'node:readline';
+
+const ansiRegex = /\x1b\[(?:[0-9]{1,3}(?:;[0-9]{1,3})*)?[mK]?/g;
+
+function tokenize(line) {
+	const tokens = [];
+	let lastIndex = 0;
+
+	for (const match of line.matchAll(ansiRegex)) {
+		const index = match.index;
+
+		if (index > lastIndex) {
+			tokens.push({ type: 'text', value: line.slice(lastIndex, index) });
+		}
+
+		tokens.push({ type: 'ansi', value: match[0] });
+		lastIndex = index + match[0].length;
+	}
+
+	if (lastIndex < line.length) {
+		tokens.push({ type: 'text', value: line.slice(lastIndex) });
+	}
+
+	return tokens;
+}
+
+function truncateLine(line, maxLength, tabSize=4) {
+	let col = 0;
+	let result = '';
+
+	const tokens = tokenize(line);
+
+	for (const token of tokens) {
+		if (col >= maxLength) {
+			break;
+		}
+
+		if (token.type === 'ansi') {
+			result += token.value;
+		} else {
+			let i = 0;
+
+			while (i < token.value.length && col < maxLength) {
+				const ch = token.value[i];
+
+				if (ch === '\t') {
+					const w = tabSize - (col % tabSize);
+
+					if (col + w > maxLength) {
+						i = token.value.length;
+					} else {
+						result += ' '.repeat(w);
+						col += w;
+						i++;
+					}
+				} else {
+					result += ch;
+					col += 1;
+					i++;
+				}
+			}
+		}
+	}
+
+	return result.replace(/\s+$/, '') + '\x1b[0m';
+}
+function parseArgs(argv) {
+	let filename = '/dev/stdin';
+	let length = 50;
+
+	for (let i = 2; i < argv.length; i++) {
+		const arg = argv[i];
+
+		if (arg === '-l' || arg === '--length') {
+			const value = argv[i + 1];
+			if (value) {
+				length = parseInt(value, 10);
+				i++;
+			}
+		} else {
+			filename = arg;
+		}
+	}
+
+	return { filename, length };
+}
+
+async function main() {
+	const { filename, length } = parseArgs(process.argv);
+
+	let inputStream;
+
+	if (filename === '/dev/stdin') {
+		inputStream = process.stdin;
+	} else {
+		inputStream = fs.createReadStream(filename, { encoding: 'utf8' });
+	}
+
+	const rl = readline.createInterface({
+		input: inputStream,
+		crlfDelay: Infinity,
+	});
+
+	for await (const line of rl) {
+		const truncated = truncateLine(line, length);
+		process.stdout.write(truncated + '\n');
+	}
+}
+
+await main();