hoppa-cli/src/command.js

Powerful task for developers

const argv = process.argv;
const cli = {
    command: argv[2] ? (argv[2].startsWith('-') ? '' : argv[2]) : '',
    args: argv.filter((v, i) => i > 2 && !v.startsWith('-')),
    options: argv.filter((v, i) => i > 1 && v.startsWith('-'))
};
const entries = [];

function Command(name, description) {
    this.name = name;
    this.options = {};
    entries.push({ name, description, options: [] });
}

Command.prototype.option = function (name, description) {
    var names = name.split(',').map(x => x.trim());
    entries.forEach((task, index) => {
        if (task.name == this.name) {
            entries[index].options.push({ name, description });
        }
    });
    
    var ok = cli.options.some(v => names.indexOf(v) >= 0);
    names.forEach(name => this.options[name.replace('--', '').replace('-', '')] = ok);
    return this;
}

/**
 * @param action {((args: string[], options: any) => void)}
 */
Command.prototype.action = function (action) {
    if (cli.command == this.name && !command.RAN) {
        action.call(this, cli.args, this.options);
        command.RAN = true;
    }
}

const command = (name, description) => new Command(name, description);

command.log = (...args) => console.log(args.join(' '));

command.chalk = require('chalk').default;

command.command = (...args) => new command(...args);

command.rl = require('readline-sync');

command.help = (app) => command('help', 'Show this help')
    .action(() => {
        var commandLen = entries.reduce((p, curr) => Math.max(curr.name.length, p), 0);
        var optionLen = entries.reduce((p, curr) => Math.max(
            p,
            curr.options.reduce((p, curr) => Math.max(
                p,
                curr.name.length
            ), 0)
        ), 0);
        entries.forEach(entry => {
            var { name, description, options } = entry;
            name = name + ' '.repeat(commandLen - name.length);
            command.log(command.chalk.blue(app), command.chalk.green(name), '-', description);
            options.forEach(option => {
                var { name, description } = option;
                name = name + ' '.repeat(optionLen - name.length);
                command.log(command.chalk.gray(`    ${name} ${description}`));
            });

            if (options.length) command.log();
        });
    });

module.exports = command;