My Gulp File Yo

gulpfile

var
    concat = require('gulp-concat'),
    del = require('del'),
    gulp = require('gulp'),
    karma = require('gulp-karma'),
    args = require('yargs');

var Args = function(yargs) {
  var _match = yargs.m || yargs.match;
  var _file = yargs.f || yargs.file;
  return {
    file: function() { return _file; },
    match: function() { if (_match) { return {args: ['--grep', _match]} } }
  };
}(args.argv);

var Files = function(args) {
  var globs = {
    lib: 'lib/**/*.js',
    public: 'public/**',
    spec: 'spec/**/*.js'
  };

  var public = {
    dest: './public/',
    js: 'bam.js',
  }

  var dependencies = [
    'node_modules/jasmine-ajax/lib/mock-ajax.js',
    'bower_components/mootools/dist/mootools-core.min.js'
  ];

  var testFiles = function() {
    var files = dependencies.concat([globs.public]);
    args.file() ? files.push(args.file()) : files.push(globs.spec);
    return files;
  };

  return {
    globs: globs,
    testFiles: testFiles(),
    karma: 'spec/karma.conf.js',
    public: public
  };
}(Args);

var Log = function() {
  return {
    error: function(message) { return console.error(message); },
    warn: function(message) { return console.warn(message); },
    info: function(message) { return console.log(message); }
  };
}();

var Tasks = function() {
  var build = function() {
    return gulp.src(Files.globs.lib)
      .pipe(concat(Files.public.js))
      .pipe(gulp.dest(Files.public.dest));
  };

  var test = function() {
    return gulp.src(Files.testFiles)
      .pipe(karma({ configFile: Files.karma, client: Args.match()}))
      .on('error', function(err) { throw err; });
  };

  var clean = function() {
    return del([Files.globs.public]);
  };

  return {
    build: function() { return build() },
    clean: function() { return clean() },
    test: function() { return test() }
  }
}(Args);

gulp.task('default', ['build'], Tasks.test);

gulp.task('build', ['clean'], Tasks.build);
gulp.task('b', ['clean'], Tasks.build);

gulp.task('clean', Tasks.clean);
gulp.task('c', Tasks.clean);