gulpfilejs

var gulp = require('gulp');
var less = require('gulp-less-sourcemap');
var uglify = require('gulp-uglify');
var concat = require('gulp-concat');
var imagemin = require('gulp-imagemin');
var path = require('path');

var themeMainDir = './wp-content/themes/ThemeName';
var cssMainDir = themeMainDir + '/css';
var lessMainDir = cssMainDir + '/less';
var jsMainDir = themeMainDir + '/js';
var imageMainDir = themeMainDir + '/images';

gulp.task('less', function () {
  return gulp.src([lessMainDir + '/style.less', lessMainDir + '/editor-style.less'])
    .pipe(less({
      paths: [ path.join(__dirname, 'less', 'includes') ],
      compress: true,
      sourceMap: { sourceMapRootpath: lessMainDir }
    }).on('error', function(error){
      console.log(error.message);
    }))
    .pipe(gulp.dest(cssMainDir));
});

gulp.task('concat', function(){
    return gulp.src([jsMainDir + '/lightbox.js', jsMainDir + '/plugins.js', jsMainDir + '/main.js'])
  .pipe(concat('main.min.js'))
    .pipe(uglify())
    .pipe(gulp.dest(jsMainDir));
});

gulp.task('image-compress', function () {
  return gulp.src(imageMainDir + '/**/*')
    .pipe(imagemin())
    .pipe(gulp.dest(imageMainDir));
});

gulp.task('uploads-compress', function () {
  return gulp.src('./wp-content/uploads/**/*')
    .pipe(imagemin())
    .pipe(gulp.dest('./wp-content/uploads'));
});

gulp.task('watch', function() {
  gulp.watch(lessMainDir + '/**/*.less', ['less']);
  gulp.watch([jsMainDir + '/main.js', jsMainDir + '/plugins.js'], ['concat']);
});