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index.js
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index.js
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const cluster = require('cluster');
const globby = require('globby');
const eventToPromise = require('event-to-promise');
const { prompt } = require('enquirer');
const spawn = require('cross-spawn');
const LESSONS_DIR = './lessons/';
function spawnNodemonOnWindows(file, ...args) {
return spawn('npx.cmd', ['nodemon', file, ...args], {
detached: true,
shell: true,
});
}
function spawnNodemon(file, ...args) {
return spawn('npx', ['nodemon', file, ...args], {
detached: true,
shell: true,
stdio: ['inherit', 'inherit', 'inherit', 'ipc'],
});
}
function spawnVSC(file) {
return spawn('code', [file]);
}
async function chooseModule(modules) {
const questions = [
{
type: 'select',
name: 'moduleName',
message: 'Select module',
initial: 0,
choices: modules.map(m => ({
name: m,
message: m,
value: m,
})),
},
];
const { moduleName } = await prompt(questions);
return moduleName;
}
async function chooseLesson(lessons) {
const questions = [
{
type: 'select',
name: 'lesson',
message: 'Select lesson',
initial: 0,
choices: lessons.map(([lesson, test]) => ({
name: test ? `${lesson}.${test}` : lesson,
message: lesson + (test ? ' [TEST]' : ''),
value: test ? `${lesson}.${test}` : lesson,
})),
},
];
const { lesson } = await prompt(questions);
return lesson.split('.');
}
async function startLesson() {
const lessons = await globby(`${LESSONS_DIR}**/*.js`);
const modules = lessons
.map(p => p.substring(LESSONS_DIR.length, p.length - 3).split('/'))
.reduce((mods, [mod, lesson]) => {
if (!mods[mod]) {
mods[mod] = [];
}
mods[mod].push(lesson.split('.'));
return mods;
}, {});
const activeModule = await chooseModule(Object.keys(modules).sort());
const [lesson, test] = await chooseLesson(modules[activeModule]);
return {
path: `${activeModule}/${lesson}`,
isTest: !!test,
};
}
async function master(options = {}) {
const { code } = options;
const selector = cluster.fork();
const { lesson } = await eventToPromise(selector, 'message');
if (lesson) {
if (code) {
spawnVSC(
`${LESSONS_DIR}${lesson.path}${lesson.isTest ? '.test' : ''}.js`
);
}
const nodemon = process.platform.startsWith('win')
? spawnNodemonOnWindows
: spawnNodemon;
const app = nodemon(lesson.isTest ? 'test.js' : 'lesson.js', lesson.path);
await eventToPromise(process, 'SIGINT');
app.kill();
return master(options);
}
}
function child() {
return startLesson()
.then(lesson => process.send({ lesson }))
.catch(() => process.send({ lesson: null }))
.then(() => process.exit(0));
}
if (cluster.isMaster) {
const { code } = require('yargs').options({
code: {
describe: 'Use with VSCode',
type: 'boolean',
},
}).argv;
master({ code });
} else {
child();
}