gulpfile.js

var lr = require('tiny-lr');
var gulp = require('gulp');
var gulputil = require('gulp-util');
var watch = require('gulp-watch');
var uglify = require('gulp-uglify');
var imagemin = require('gulp-imagemin');
var livereload = require('gulp-livereload');
var concat = require('gulp-concat');
var less = require('gulp-less');
var bower = require('gulp-bower');
var usemin = require('gulp-usemin');

var rjs = require('gulp-requirejs');
var uglify = require('gulp-uglify');
var rev = require('gulp-rev');
var clean = require('gulp-clean');

var rjsConfig = require('./public/scripts/requirejsConfig');
var es = require('event-stream');

var server = lr();
// gulp.task('default', function(){
//   // place code for your default task here
// });


var deployIEScripts = function() {
    gulp.src(['public/bower_components/es5-shim/es5-shim.min.js', 'public/bower_components/json3/lib/json3.min.js'])
                .pipe(gulp.dest('public/scripts/'))
        .pipe(gulp.dest('dist/scripts/'));
};

// https://github.com/gulpjs/gulp/blob/master/docs/recipes/running-tasks-in-series.md#running-tasks-in-series

var concatJs = function() {
    console.log(rjsConfig);
    rjsConfig.baseUrl = "public/scripts";
    rjsConfig.out = 'concat.js';
    rjsConfig.name = "main";

    return rjs(rjsConfig).pipe(uglify({
        outSourceMap: true,
        output: {
            ascii_only: false
        }
    }))
        .pipe(gulp.dest('dist/scripts/')); // pipe it to the output DIR

};

gulp.task('build2', ['build'], function(cb) {
    //smell of bad design but works
    //trick let this two overwite the concated js file
    //simple overwrite wont do as it just stream to same files ignoring existing content length

    es.concat(
        gulp.src('pre-dist/index.html')
        .pipe(gulp.dest('dist/')),
        gulp.src(['public/scripts/require.min.js'])
        .pipe(gulp.dest('dist/scripts/')),
        concatJs()
    ).on('end', cb);

});

gulp.task('pre-dist-clean', ['build', 'build2'], function() {
    //     //ok remove folder not scripts
    //     console.log('clean');
    gulp.src('pre-dist/', {
        read: true
    }).pipe(clean({
        force: true
    }));
});



gulp.task('dist', ['build', 'build2', 'pre-dist-clean']);



gulp.task('build', function(cb) {

    deployIEScripts();

    var lessStream = gulp.src('less/*.less')
        .pipe(less())
        .pipe(gulp.dest('dist/css/'));

    var templatesStream = gulp.src(['public/templates/**.html'])
        .pipe(gulp.dest('dist/templates/'));


    var htmlMinStream = gulp.src('public/index.html')
        .pipe(usemin({
            // css: [minifyCss(), 'concat'],
            // html: [minifyHtml({empty: true})],
            js: []
        }))
        .pipe(gulp.dest('pre-dist/'));
    //discard it as concat may run before above
    es.concat(
        lessStream, templatesStream, htmlMinStream
    ).on('end', cb);

});


gulp.task('default', ['listen'], function() {

    bower()
        .pipe(gulp.dest('public/bower_components/'));

    //TODO ensure bower end

    deployIEScripts();


    gulp.src(['public/*', 'public/templates/*', 'public/scripts/*'])
        .pipe(watch())
        .pipe(livereload(server));

    gulp.src('less/*.less')
        .pipe(watch())
        .pipe(less())
        .pipe(gulp.dest('public/css/'))
        .pipe(livereload(server));

    concatJs();


});

gulp.task('listen', function(next) {
    server.listen(35729, function(err) {
        if (err) return console.error(err);
        next();
    });
});