Gulp JS LESS

gulpfile.js

var gulp       = require('gulp');  
var less       = require('gulp-less');  
var watch      = require('gulp-watch');  
var minify     = require('gulp-minify-css');  
var rename     = require('gulp-rename');  
var header     = require('gulp-header');  
var pkg        = require('./package.json');
var sourcemaps = require('gulp-sourcemaps');

/* Prepare banner text */
 var banner = ['/**',  
   ' * www.erick-olivares.com v1.0',
   ' * Minified CSS',
   ' * Erick Olivares, erickolivares21@gmail.com',
   ' */',
   ''].join('\n');

/* Task to compile less */
gulp.task('compile-less', function() {  
  gulp.src('./wp-content/themes/rez/less/style.less')
    .pipe(sourcemaps.init())
    .pipe(less())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('./wp-content/themes/rez/'));
});

/* Task to minify css */
gulp.task('minify-css', function() {  
  gulp.src('./wp-content/themes/rez/style.css')
    .pipe(minify())
    .pipe(header(banner, {pkg: pkg}))
    .pipe(rename('./wp-content/themes/rez/css/style.min.css'))
    .pipe(gulp.dest( './' ));
});

/* Task to watch less changes */
gulp.task('watch-less', function() {  
  gulp.watch('./wp-content/themes/rez/less/**/*.less' , ['compile-less']);
});

gulp.task('less', ['compile-less', 'watch-less']);
gulp.task('build', ['minify-css']);