gistfile1.txt

var gulp = require('gulp');
var sass = require('gulp-sass');
var cssnano = require('gulp-cssnano');

gulp.task('nano', function() {
    return gulp.src('../assets/css/all.css')
        .pipe(cssnano())
        .pipe(gulp.dest('../'));
});

gulp.task('sass', function () {
  gulp.src('../assets/scss/**/*.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(gulp.dest('../assets/css'));
});

gulp.task('vendors', function () {
  gulp.src('../vendors/bootstrap/plugins.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(gulp.dest('../vendors'));
});

gulp.task('default', function () {
  gulp.watch('../assets/scss/**/*.scss', ['sass']);
  gulp.watch('../vendors/bootstrap/_bootstrap.scss', ['vendors']);
  gulp.watch('../assets/css/all.css', ['nano']);
});