watchem.js

var gulp = require('gulp');
var browserify = require('gulp-browserify');
var less = require('gulp-less');
var concat = require('gulp-concat');
var jshint = require('gulp-jshint');
var watch = require('gulp-watch');

var outDir = './temp';

var isWatch = false;

var sources = {
  scripts: './app/scripts/**/*.js',
  less: './app/styles/**/*.less',
  copy: './app/images/*',
  browserify: './app/scripts/main.js'
};

function watchOrNot(files) {
  return isWatch ? gulp.src(files).pipe(watch()) : gulp.src(files);
}

gulp.task('watch', function () {
  isWatching = true;
  gulp.run('default');
});

gulp.task('default', function () {
  gulp.run('copy', 'less', 'jshint', 'browserify');
});

gulp.task('copy', function () {
  watchOrNot(sources.copy)
    .pipe(gulp.dest(outDir + '/images'))
});


gulp.task('less', function () {
  watchOrNot(sources.less)
    .pipe(less({compress: false}))
    .pipe(gulp.dest(outDir + '/styles'));
});


gulp.task('jshint', function() {
  watchOrNot(sources.scripts)
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'))
});


gulp.task('browserify', function() {
  watchOrNot(sources.browserify)
    .pipe(browserify())
    .pipe(concat('main.js'))
    .pipe(gulp.dest(outDir + '/scripts/'))
});