Source code analytics with sloc

sourceAnalytics.js

const chalk = require('chalk');
const glob = require('glob');
const sloc = require('sloc');
const fs = require('fs');

let pattern = "**";
let jsExcludes = ['**/app.bundle.*', '**/node_modules/**', '**/lib/**'];
let slocKeys = ['total', 'comment', 'todo', 'source'];
let extension = process.argv.slice(2)[0];
let targetExtension = `*.${extension}`;

globExtension(targetExtension, jsExcludes)
    .then(slocFiles)
    .catch( err => console.log(chalk.red(err)));

function slocFiles(files) {
    let total = {};
    for (file of files.reverse()) {
        let code = fs.readFileSync(file, "utf8");
        var stats = sloc(code, extension);
        printLine("-");
        console.log(chalk.yellow(file));
        for (key of slocKeys) {
            total[key] ? total[key] += stats[key] : total[key] = stats[key];
            console.log(chalk.green(key + " : " + stats[key]));
        }
        printLine("-");
    }

    printTotals(total);
}

function globExtension(extension, ignore) {
    return new Promise((res, rej) => {
        let options = {
            ignore
        };
        glob(`${pattern}/${extension}`, options, function (err, files) {
            if (err) {
                rej(err);
            }
            res(files);
        })
    });
}

function printTotals(total) {
    printLine("*");
    console.log(chalk.bgBlue(`\n\nAll files resume for ${targetExtension} extension`));
    for (key in total) {
        console.log(chalk.cyan(`${key} : ${total[key]}`));
    }
    printLine("*");
}

function printLine(char) {
    console.log(chalk.white(getLine(char)));
}

function getLine(char) {
    return "".padStart(20, char);
}