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nano.js
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nano.js
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#!/usr/bin/env ant
import fs from 'node:fs';
import path from 'node:path';
const { stdin, stdout } = process;
let file = process.argv[2];
let highlight = file ? /\.(c|m)?(j|t)s$/.test(path.extname(file)) : false;
let lines = [''];
let modified = false;
let row = 0;
let col = 0;
let scrollY = 0;
let scrollX = 0;
let message = '';
let msgTimer = null;
let mode = 'edit';
let prompt = '';
let promptCb = null;
let promptBuf = '';
let promptKeys = null;
let searchTerm = '';
if (file) {
try {
const content = fs.readFileSync(file, 'utf8');
lines = content.split('\n');
if (lines[lines.length - 1] === '') lines.pop();
if (!lines.length) lines = [''];
setMessage(`[ Read ${lines.length} line${lines.length !== 1 ? 's' : ''} ]`);
} catch {
setMessage('[ New File ]');
}
} else {
setMessage('[ New File ]');
}
function setMessage(msg) {
if (msgTimer) clearTimeout(msgTimer);
message = msg;
msgTimer = setTimeout(() => {
message = '';
draw();
}, 1500);
}
function rows() {
return stdout.rows - 4;
}
function cols() {
return stdout.columns;
}
function clamp() {
if (row < 0) row = 0;
if (row >= lines.length) row = lines.length - 1;
if (col < 0) col = 0;
if (col > lines[row].length) col = lines[row].length;
if (row < scrollY) scrollY = row;
if (row >= scrollY + rows()) scrollY = row - rows() + 1;
if (col < scrollX) scrollX = col;
if (col >= scrollX + cols()) scrollX = col - cols() + 1;
}
function shortcutRow(shortcuts, w, totalCols) {
const cols = totalCols || shortcuts.length;
const cellW = Math.floor(w / cols);
let out = '';
for (let i = 0; i < shortcuts.length; i++) {
const [key, label] = shortcuts[i];
if (!key && !label) {
out += ' '.repeat(cellW);
continue;
}
const cell = `\x1b[7m${key}\x1b[0m ${label}`;
const padLen = cellW - key.length - label.length - 1;
out += cell + (padLen > 0 ? ' '.repeat(padLen) : '');
}
return out;
}
function draw() {
const h = rows();
const w = cols();
let out = '\x1b[H';
const titleL = ` ANT nano ${Ant.version.match(/^\d+\.\d+\.\d+/)[0]}`;
const titleC = file || 'New Buffer';
const titleR = modified ? 'Modified' : '';
const cpad = Math.max(0, Math.floor((w - titleC.length) / 2) - titleL.length);
const rpad = Math.max(0, w - titleL.length - cpad - titleC.length - titleR.length);
out += `\x1b[7m${titleL}${' '.repeat(cpad)}${titleC}${' '.repeat(rpad)}${titleR}\x1b[0m`;
const visible = lines.slice(scrollY, scrollY + h);
const raw = visible.map(l => l.slice(scrollX, scrollX + w));
let body;
if (highlight) {
const joined = raw.join('\n');
body = Ant.highlight(joined).split('\n');
} else {
body = raw;
}
if (searchTerm) {
const visRow = row - scrollY;
const matchCol = col - scrollX;
const matchEnd = matchCol + searchTerm.length;
if (visRow >= 0 && visRow < body.length && body[visRow] && matchCol >= 0) {
const rendered = body[visRow];
let result = '';
let visIdx = 0;
let inHL = false;
for (let bi = 0; bi < rendered.length; ) {
if (rendered[bi] === '\x1b') {
const end = rendered.indexOf('m', bi);
if (end !== -1) {
result += rendered.slice(bi, end + 1);
bi = end + 1;
continue;
}
}
if (visIdx === matchCol && !inHL) {
result += '\x1b[43;30m';
inHL = true;
}
if (visIdx === matchEnd && inHL) {
result += '\x1b[0m';
inHL = false;
}
result += rendered[bi++];
visIdx++;
}
if (inHL) result += '\x1b[0m';
body[visRow] = result;
}
}
for (let i = 0; i < h; i++) {
out += `\x1b[${i + 2};1H\x1b[2K`;
out += body[i] || '';
}
const statusRow = h + 2;
out += `\x1b[${statusRow};1H\x1b[2K`;
if (mode === 'yesno') {
const q = 'Save modified buffer?';
out += `\x1b[7m${q}${' '.repeat(Math.max(0, w - q.length))}\x1b[0m`;
} else if (mode === 'prompt') {
const promptText = prompt + promptBuf;
out += `\x1b[7m${promptText}${' '.repeat(Math.max(0, w - promptText.length))}\x1b[0m`;
} else if (message) {
const pad = Math.max(0, Math.floor((w - message.length) / 2));
out += ' '.repeat(pad) + `\x1b[7m${message}\x1b[0m`;
}
let row1, row2;
if ((mode === 'prompt' || mode === 'yesno') && promptKeys) {
row1 = promptKeys[0];
row2 = promptKeys[1];
} else {
row1 = [
['^G', 'Help'],
['^X', 'Exit'],
['^O', 'Write'],
['^W', 'Search'],
['^K', 'Cut'],
['^U', 'Paste']
];
row2 = [
['^A', 'Home'],
['^E', 'End'],
['^\\', 'Replace'],
['^T', 'Execute'],
['^J', 'Justify'],
['^C', 'Location']
];
}
out += `\x1b[${h + 3};1H\x1b[2K`;
out += shortcutRow(row1, w);
out += `\x1b[${h + 4};1H\x1b[2K`;
out += shortcutRow(row2, w);
if (mode === 'yesno') {
out += `\x1b[${statusRow};${'Save modified buffer?'.length + 2}H`;
} else if (mode === 'prompt') {
out += `\x1b[${statusRow};${prompt.length + promptBuf.length + 1}H`;
} else {
const cy = row - scrollY + 2;
const cx = col - scrollX + 1;
out += `\x1b[${cy};${cx}H`;
}
stdout.write(out);
}
let cutBuf = [];
const writePromptKeys = [
[
['^G', 'Help'],
['M-D', 'DOS Format'],
['M-A', 'Append'],
['M-B', 'Backup File'],
['^T', 'Browse']
],
[
['^C', 'Cancel'],
['M-M', 'Mac Format'],
['M-P', 'Prepend'],
['^Q', 'Discard buffer'],
['', '']
]
];
function handleYesNo(buf) {
const ch = buf[0];
if (ch === 0x79 || ch === 0x59) {
mode = 'edit';
promptKeys = null;
if (file) {
save(file);
quit();
return;
}
startPrompt(
'Write to File: ',
name => {
if (!name) {
setMessage('[ No file name given ]');
return;
}
save(name);
quit();
},
writePromptKeys
);
} else if (ch === 0x6e || ch === 0x4e) {
mode = 'edit';
promptKeys = null;
quit();
} else if (ch === 0x03) {
mode = 'edit';
promptKeys = null;
setMessage('[ Cancelled ]');
}
}
function handleKey(buf) {
if (mode === 'yesno') {
handleYesNo(buf);
return;
}
if (mode === 'prompt') {
handlePrompt(buf);
return;
}
message = '';
const ch = buf[0];
if (ch === 0x1b && buf[1] === 0x5b) {
const code = buf[2];
if (code === 0x41) row--;
else if (code === 0x42) row++;
else if (code === 0x43) col++;
else if (code === 0x44) col--;
else if (code === 0x48) col = 0;
else if (code === 0x46) col = lines[row].length;
else if (code === 0x35 && buf[3] === 0x7e) {
row -= rows();
} else if (code === 0x36 && buf[3] === 0x7e) {
row += rows();
}
clamp();
return;
}
if (ch === 0x18) {
if (modified) {
mode = 'yesno';
promptKeys = [
[
['Y', 'Yes'],
['', ''],
['', ''],
['', ''],
['', ''],
['', '']
],
[
['N', 'No'],
['', ''],
['^C', 'Cancel'],
['', ''],
['', ''],
['', '']
]
];
} else quit();
return;
}
if (ch === 0x0f) {
startPrompt(
'Write to File: ',
name => {
const target = name || file;
if (!target) {
setMessage('[ No file name given ]');
return;
}
save(target);
setMessage(`[ Wrote ${lines.length} line${lines.length !== 1 ? 's' : ''} ]`);
},
writePromptKeys
);
return;
}
if (ch === 0x17) {
startPrompt(
'Search: ',
term => {
if (term) searchTerm = term;
if (!searchTerm) return;
for (let i = row; i < lines.length; i++) {
const idx = lines[i].indexOf(searchTerm, i === row ? col + 1 : 0);
if (idx !== -1) {
row = i;
col = idx;
clamp();
return;
}
}
for (let i = 0; i <= row; i++) {
const idx = lines[i].indexOf(searchTerm);
if (idx !== -1) {
row = i;
col = idx;
clamp();
return;
}
}
setMessage(`[ "${searchTerm}" not found ]`);
},
null,
searchTerm
);
return;
}
if (ch === 0x0b) {
cutBuf = [lines[row]];
lines.splice(row, 1);
if (!lines.length) lines = [''];
modified = true;
clamp();
return;
}
if (ch === 0x15) {
if (cutBuf.length) {
lines.splice(row, 0, ...cutBuf);
modified = true;
clamp();
}
return;
}
if (ch === 0x01) {
col = 0;
return;
}
if (ch === 0x05) {
col = lines[row].length;
return;
}
if (ch === 0x7f) {
if (col > 0) {
lines[row] = lines[row].slice(0, col - 1) + lines[row].slice(col);
col--;
} else if (row > 0) {
col = lines[row - 1].length;
lines[row - 1] += lines[row];
lines.splice(row, 1);
row--;
}
modified = true;
clamp();
return;
}
if (ch === 0x0d) {
const rest = lines[row].slice(col);
lines[row] = lines[row].slice(0, col);
lines.splice(row + 1, 0, rest);
row++;
col = 0;
modified = true;
clamp();
return;
}
if (ch === 0x09 || ch >= 0x20) {
const c = ch === 0x09 ? '\t' : String.fromCharCode(ch);
lines[row] = lines[row].slice(0, col) + c + lines[row].slice(col);
col++;
modified = true;
clamp();
return;
}
}
function startPrompt(msg, cb, keys, prefill) {
mode = 'prompt';
prompt = msg;
promptBuf = prefill || '';
promptCb = cb;
promptKeys = keys || null;
}
function handlePrompt(buf) {
const ch = buf[0];
if (ch === 0x0d) {
mode = 'edit';
promptKeys = null;
const cb = promptCb;
promptCb = null;
cb(promptBuf);
return;
}
if (ch === 0x03) {
mode = 'edit';
promptCb = null;
promptKeys = null;
setMessage('[ Cancelled ]');
return;
}
if (ch === 0x1b) return;
if (ch === 0x7f) {
promptBuf = promptBuf.slice(0, -1);
return;
}
if (ch >= 0x20) {
promptBuf += String.fromCharCode(ch);
}
}
function save(target) {
file = target;
highlight = /\.(c|m)?(j|t)s$/.test(path.extname(file));
fs.writeFileSync(file, lines.join('\n') + '\n');
modified = false;
}
function quit() {
stdin.setRawMode(false);
stdout.write('\x1b[?1049l');
stdout.write('\x1b[?25h');
process.exit(0);
}
stdout.write('\x1b[?1049h');
stdout.write('\x1b[?25h');
stdin.setRawMode(true);
stdin.resume();
draw();
stdin.on('data', buf => {
handleKey(buf);
draw();
});
stdout.on('resize', () => draw());

File Metadata

Mime Type
application/javascript
Expires
Sat, May 2, 8:31 AM (2 d)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
542195
Default Alt Text
nano.js (10 KB)

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