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/*---------------------------------------------------------------------------------------------
* LevelCode — Hackability: package generator + hot reload
*
* "Generate Package" scaffolds a runnable LevelCode package (plain JS, no build step).
* "Develop Package (Hot Reload)" loads a package's extension.js into the RUNNING window and
* re-runs activate() on every save — Atom-style live development, no window restart. (Code
* runs live; manifest-only `contributes` still need the generated F5 launch config.)
*--------------------------------------------------------------------------------------------*/
// @ts-check
'use strict';
const vscode = require('vscode');
const os = require('os');
const fs = require('fs');
const path = require('path');
const Module = require('module');
const PACKAGES_DIR = path.join(os.homedir(), '.levelcode', 'packages');
/** @type {vscode.OutputChannel} */
let output;
/** Active dev session, or null. */
let dev = null; // { dir, name, exports, ctx, watcher, status, timer }
// ---- generator -------------------------------------------------------------
function pkgJson(name, title) {
return JSON.stringify({
name,
displayName: title,
description: 'An LevelCode package.',
version: '0.0.1',
publisher: 'you',
engines: { vscode: '^1.126.0' },
categories: ['Other'],
activationEvents: ['onStartupFinished'],
main: './extension.js',
contributes: { commands: [{ command: name + '.hello', title: title + ': Hello' }] }
}, null, 2) + '\n';
}
function extJs(name) {
return `// ${name} — an LevelCode package.
//
// Develop it live: run "LevelCode: Develop Package (Hot Reload)" and pick this folder.
// Edit + save and activate() re-runs instantly — no window restart. (For manifest
// contributions like keybindings, press F5 for a full Extension Development Host.)
const vscode = require('vscode');
function activate(context) {
\tconst hello = vscode.commands.registerCommand('${name}.hello', () => {
\t\tvscode.window.showInformationMessage('Hello from ${name}! 👋');
\t});
\tcontext.subscriptions.push(hello);
\t// A status bar item — try changing this text and saving while hot-reload is running:
\tconst item = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left, 0);
\titem.text = '$(rocket) ${name}';
\titem.tooltip = 'From the ${name} package';
\titem.show();
\tcontext.subscriptions.push(item);
}
function deactivate() {}
module.exports = { activate, deactivate };
`;
}
function launchJson() {
return JSON.stringify({
version: '0.2.0',
configurations: [{
name: 'Run Package',
type: 'extensionHost',
request: 'launch',
args: ['--extensionDevelopmentPath=${workspaceFolder}']
}]
}, null, 2) + '\n';
}
async function generatePackage() {
const name = await vscode.window.showInputBox({
title: 'LevelCode — Generate Package',
prompt: 'Package name (lowercase, hyphens — e.g. my-cool-package)',
validateInput: (v) => /^[a-z][a-z0-9-]*$/.test(v || '') ? null : 'Use lowercase letters, digits and hyphens; start with a letter.'
});
if (!name) { return; }
const dir = path.join(PACKAGES_DIR, name);
if (fs.existsSync(dir)) {
vscode.window.showErrorMessage('LevelCode: a package named “' + name + '” already exists at ' + dir);
return;
}
const title = name.replace(/(^|-)([a-z])/g, (_, s, c) => (s ? ' ' : '') + c.toUpperCase());
try {
fs.mkdirSync(path.join(dir, '.vscode'), { recursive: true });
fs.writeFileSync(path.join(dir, 'package.json'), pkgJson(name, title), 'utf8');
fs.writeFileSync(path.join(dir, 'extension.js'), extJs(name), 'utf8');
fs.writeFileSync(path.join(dir, 'README.md'), '# ' + title + '\n\nAn LevelCode package.\n', 'utf8');
fs.writeFileSync(path.join(dir, '.vscode', 'launch.json'), launchJson(), 'utf8');
} catch (e) {
vscode.window.showErrorMessage('LevelCode: could not scaffold package: ' + ((e && e.message) || e));
return;
}
const doc = await vscode.workspace.openTextDocument(vscode.Uri.file(path.join(dir, 'extension.js')));
await vscode.window.showTextDocument(doc);
const go = 'Develop (Hot Reload)';
const c = await vscode.window.showInformationMessage('LevelCode: created package “' + name + '”.', go);
if (c === go) { startDev(dir); }
}
// ---- hot-reload dev loader -------------------------------------------------
/** Load a package's main module fresh, with require('vscode') wired to the real API. */
function loadPackageExports(dir) {
let main = path.join(dir, 'extension.js');
try {
const pj = JSON.parse(fs.readFileSync(path.join(dir, 'package.json'), 'utf8'));
if (pj.main) { main = path.join(dir, pj.main); }
} catch { /* default to extension.js */ }
// Bust any cached modules under this package so sub-requires reload too.
for (const k of Object.keys(require.cache)) { if (k.startsWith(dir + path.sep)) { delete require.cache[k]; } }
const m = new Module(main, null);
m.filename = main;
m.paths = Module._nodeModulePaths(path.dirname(main));
const baseRequire = m.require.bind(m);
// @ts-ignore — intercept the bare 'vscode' specifier
m.require = (id) => (id === 'vscode' ? vscode : baseRequire(id));
m._compile(fs.readFileSync(main, 'utf8'), main);
return m.exports;
}
function makeContext(dir) {
const noState = { get: () => undefined, update: async () => {}, keys: () => [] };
return {
subscriptions: [],
extensionPath: dir,
extensionUri: vscode.Uri.file(dir),
globalState: noState,
workspaceState: noState,
extensionMode: 2 // Development
};
}
function teardownDev(keepStatus) {
if (!dev) { return; }
try { if (dev.exports && typeof dev.exports.deactivate === 'function') { dev.exports.deactivate(); } } catch (e) { output.appendLine('[dev] deactivate error: ' + e); }
for (const d of dev.ctx.subscriptions) { try { if (d && d.dispose) { d.dispose(); } } catch { /* ignore */ } }
dev.ctx.subscriptions = [];
if (!keepStatus) {
if (dev.timer) { clearTimeout(dev.timer); }
try { dev.watcher.close(); } catch { /* ignore */ }
dev.status.dispose();
}
}
function activatePackage() {
const ctx = makeContext(dev.dir);
dev.ctx = ctx;
const exports = loadPackageExports(dev.dir);
dev.exports = exports;
if (typeof exports.activate === 'function') { exports.activate(ctx); }
output.appendLine('[dev] activated ' + dev.name + ' (' + ctx.subscriptions.length + ' disposable(s))');
}
function reloadDev() {
if (!dev) { return; }
teardownDev(true);
try {
activatePackage();
dev.status.text = '$(sync) dev: ' + dev.name;
vscode.window.setStatusBarMessage('LevelCode: reloaded ' + dev.name, 1500);
setTimeout(() => { if (dev) { dev.status.text = '$(circle-filled) dev: ' + dev.name; } }, 600);
} catch (e) {
const msg = (e && e.stack) ? e.stack : String(e);
output.appendLine('[dev] ERROR activating ' + dev.name + ':\n' + msg);
vscode.window.showErrorMessage('LevelCode: ' + dev.name + ' failed to load: ' + ((e && e.message) || e), 'Show Log')
.then((c) => { if (c) { output.show(true); } });
if (dev) { dev.status.text = '$(error) dev: ' + dev.name; }
}
}
function startDev(dir) {
if (dev) { stopDev(); }
const name = path.basename(dir);
const status = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left, -10);
status.command = 'levelcode.package.stop';
status.text = '$(circle-filled) dev: ' + name;
status.tooltip = 'LevelCode is hot-reloading “' + name + '”. Click to stop.';
status.show();
const watcher = fs.watch(dir, { recursive: true }, (_event, file) => {
if (file && /node_modules|\.git|\.vscode/.test(String(file))) { return; }
if (file && !/\.js$/.test(String(file))) { return; }
if (dev && dev.timer) { clearTimeout(dev.timer); }
if (dev) { dev.timer = setTimeout(reloadDev, 150); } // debounce burst saves
});
dev = { dir, name, exports: null, ctx: { subscriptions: [] }, watcher, status, timer: null };
reloadDev();
vscode.window.showInformationMessage('LevelCode: developing “' + name + '” with hot reload. Save to re-run.');
}
function stopDev() {
if (!dev) { vscode.window.showInformationMessage('LevelCode: no package is being developed.'); return; }
const name = dev.name;
teardownDev(false);
dev = null;
vscode.window.setStatusBarMessage('LevelCode: stopped developing ' + name, 2000);
}
async function developPackage() {
let dirs = [];
try { dirs = fs.existsSync(PACKAGES_DIR) ? fs.readdirSync(PACKAGES_DIR).map((n) => path.join(PACKAGES_DIR, n)).filter((p) => { try { return fs.statSync(p).isDirectory(); } catch { return false; } }) : []; } catch { dirs = []; }
/** @type {any[]} */
const items = dirs.map((d) => ({ label: '$(package) ' + path.basename(d), description: d, _dir: d }));
items.push({ label: '$(folder-opened) Choose a folder…', _dir: null });
const pick = await vscode.window.showQuickPick(items, { placeHolder: 'Develop which package? (hot-reloads into this window)' });
if (!pick) { return; }
let dir = pick._dir;
if (!dir) {
const picked = await vscode.window.showOpenDialog({ canSelectFolders: true, canSelectFiles: false, canSelectMany: false, openLabel: 'Develop this package', title: 'Pick an LevelCode package folder' });
if (!picked || !picked.length) { return; }
dir = picked[0].fsPath;
}
if (!fs.existsSync(path.join(dir, 'extension.js')) && !fs.existsSync(path.join(dir, 'package.json'))) {
vscode.window.showErrorMessage('LevelCode: that folder has no extension.js / package.json.');
return;
}
startDev(dir);
}
function registerPackages(context) {
output = vscode.window.createOutputChannel('LevelCode Packages');
context.subscriptions.push(
output,
vscode.commands.registerCommand('levelcode.package.generate', generatePackage),
vscode.commands.registerCommand('levelcode.package.develop', developPackage),
vscode.commands.registerCommand('levelcode.package.stop', stopDev),
{ dispose: () => { if (dev) { teardownDev(false); dev = null; } } }
);
}
module.exports = { registerPackages };