gistfile1.txt

//
// Command: optimize
//
gulp.task('optimize', ['imagemin']);

//
// Command: watch
//
gulp.task('watch', function () {
	gulp.watch('gulpfile.js', ['gulpfile']);
	gulp.watch('assets/scss/{,**/}*.scss', ['compass:dev', 'concat:css']);
	gulp.watch('assets/javascript/{,**/}*.js', ['concat:js']);
});

gulp.task('imagemin', function() {
	return gulp.src('assets/images/**')
		.pipe(imagemin({optimizationLevel: 5}))
		.pipe(gulp.dest('assets/images'));
});

// Outputs

[gulp] Finished 'imagemin' in 901 ms
[gulp] Running 'optimize'...
[gulp] Finished 'optimize' in 7.91 μs