// install
// npm i gulp-concat gulp-clean-css
var concat = require('gulp-concat');
var cleanCSS = require('gulp-clean-css');
var uncss = require('gulp-uncss');
// concat, clean and remove unused css
gulp.task('compress:css', function() {
var cssreset = './app/css/reset.css';
var cssplug = './app/css/plugins.css';
var cssfonta = './app/css/font-awesome.min.css';
var cssstyle = './app/css/style.css';
var csscolor = './app/css/color.css';
var cssmy = './app/css/my.css';
return gulp.src([cssreset, cssplug, cssfonta, cssstyle, csscolor, cssmy])
.pipe(concat('style.css'))
.pipe(uncss({
html: ['./app/*.html']
}))
.pipe(cleanCSS())
.pipe(gulp.dest('./dist/css'));
});