I'm using gulp-zip and gulp for-each to zip a number of folders. These contain other folders named _js, _css and _raw. I wish to exclude any folder beginning with an underscore from the output zipped files.
gulp.task("zipAll", function(){
   return gulp.src('src/*')
       .pipe(foreach(function(stream, file){
          var fileName = file.path.substr(file.path.lastIndexOf("/")+1);
          gulp.src("src/" + fileName + "/**/*")
              .pipe(zip(fileName + ".zip"))
              .pipe(gulp.dest("dist"));
          return stream;
       }));
});