index.js

var PLUGIN_PREFIX = 'bem-tools-';

var fs = require('fs'),
    path = require('path'),
    npmRootPath = require('global-modules'),
    cwd = process.cwd();

var bem = require('coa').Cmd()
    .name(process.argv[1])
    .title(['BEM plugins CLI runned.', '' +
        'See https://bem.info for more info.', ''].join('\n'))
    .helpful()
    .opt()
        .name('version').title('Version')
        .short('v').long('version')
        .flag()
        .only()
        .act(function() {
            return require('./package').version;
        })
        .end();

function readDir(dir) {
    return new Promise(function(resolve, reject) {
        fs.readdir(dir, function(err, packages) {
            if (err && err.code !== 'ENOENT') return reject(err);

            resolve((packages || []).reduce(function(acc, package) {
                acc[package] = path.resolve(dir, package);
                return acc;
            }, {}));
        });
    });
}

Promise.all([
    readDir(path.join(cwd, 'node_modules')),
    readDir(path.join(cwd, 'node_modules', 'bem-tools', 'node_modules')),
    readDir(path.join(__dirname, 'node_modules')),
    readDir(path.join(__dirname, 'node_modules', 'bem-tools', 'node_modules')),
    readDir(npmRootPath),
    readDir(path.join(npmRootPath, 'bem-tools', 'node_modules'))
]).then(function(packagesArray) {
    var packagesHash = Object.assign.apply(Object, packagesArray.reverse());
    var packages = Object.keys(packagesHash).filter(function(package) {
        return package.indexOf(PLUGIN_PREFIX) === 0 && package !== 'bem-tools-core';
    });

    packages.forEach(function(packageName) {
        var commandName = packageName.replace(PLUGIN_PREFIX, ''),
            pluginPath = path.join(packagesHash[packageName], 'cli'),
            pluginModule = null;
        try {
            pluginModule = require(pluginPath);
        } catch(err) {
            // TODO: implement verbose logging
            // console.warn('Cannot find module', plugin);
        }

        pluginModule && bem.cmd().name(commandName).apply(pluginModule).end();
    });

    bem.run(process.argv.slice(2));

}).catch(console.error);

bem.act(function(opts, args) {
    if (!Object.keys(opts).length && !Object.keys(args).length) {
        return this.usage();
    }
});

module.exports = bem;