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createProject.js
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createProject.js
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const { readdirSync, mkdirSync, readFileSync, writeFileSync, copyFileSync, existsSync } = require("fs");
const { spawn } = require("child_process");
exports.createProject = (myArgs) => {
const { HOME, PWD } = process.env;
let template = myArgs[1];
const sourceDir = `${PWD}/templates/${template}`;
// all further args. are written to furtherArgs
const furtherArgs = myArgs.slice(2);
// taking rules for name and dest and building an object
const furtherArgsObj = furtherArgs.reduce((acc, curr) => {
// removing the leading dashes
const shortened = curr.slice(2);
// split the argument at the "=" sign and write the elements into key and value
const [key, value] = shortened.split("=");
// create new property key in the acc. with the value value
acc[key] = value;
// return the accumulator for the next step
return acc;
}, {})
// replace the tilde in the destination
const dest = furtherArgsObj.dest.replace('~', HOME);
// destructuring the name of the project folder
const { name } = furtherArgsObj;
const targetDir = `${dest}/${name}`;
makeFolder(targetDir);
updatePackageJson(sourceDir, targetDir, name);
copyFiles(sourceDir, targetDir);
installModules(targetDir);
startProject(targetDir);
}
const makeFolder = (directory) => {
const directoryArray = directory.split("/");
for (let i = 2; i <= directoryArray.length; i++) {
// container variable
let newDir;
// containing folders from root folder to target folder
if (i !== directoryArray.length) {
newDir = directoryArray.slice(0, i).join("/");
} else {
newDir = directoryArray.slice(0).join("/");
}
// checks if folder is already existing
const isExisting = existsSync(newDir)
if (!isExisting) {
// if not, the folder is created
mkdirSync(newDir, true);
} else {
// otherwise, creation of folder is skipped
continue;
}
}
}
const updatePackageJson = (source, target, name) => {
// read the file (JSON) to packageJSONRaw
const packageJSONRaw = readFileSync(`${source}/package.json`, 'utf8');
// convert the object JSON -> JavaScript
const packageRaw = JSON.parse(packageJSONRaw);
// add the name
packageRaw.name = name;
// convert the object JavaScript -> JSON
const packageJSON = JSON.stringify(packageRaw);
// write the file
writeFileSync(`${target}/package.json`, packageJSON, { encoding: 'utf8' });
}
const copyFiles = (source, target) => {
// read files in the template folder
const contentsOfTemplate = readdirSync(source, { encoding: 'utf8' });
// take each file ...
contentsOfTemplate.forEach(file => {
// ... that is not package.json, package-lock.json, or yarn.lock ...
if (!file.includes("package") && file !== 'yarn.lock') {
// ... and copy it to the target folder
copyFileSync(`${source}/${file}`, `${target}/${file}`);
}
});
}
const installModules = (target) => {
const install = spawn('npm', ['install'], { cwd: target });
install.stderr.on('error', (err) => {
console.log('Failed to install node_modules');
});
install.stdout.on('data', (data) => {
console.log(data.toString());
});
}
const startProject = (target) => {
const runDev = spawn('npm', ['run', 'dev'], { cwd: target });
runDev.stderr.on('error', (err) => {
console.log('Failed to run nodemon');
});
runDev.stdout.on('data', (data) => {
console.log(data.toString());
});
}