gulpfile.js

var beautify = require('gulp-jsbeautifier');
var concat = require('gulp-concat');
var eslint = require('gulp-eslint');
var gulp = require('gulp');
var gulputil = require('gulp-util');
var header = require('gulp-header');
var rename = require('gulp-rename');
var replace = require('gulp-replace');
var todo = require('gulp-todo');
var uglify = require('gulp-uglify');
var webpack = require('webpack-stream');

var moment = require('moment');
var pkg = require('./package.json');

var banner =
    '/*!\n\n' +
    '<%= pkg.officialName %> - <%= pkg.summary %>\nVersion <%= pkg.version %>+<%= build %>\n' +
    '\u00A9 <%= year %> <%= pkg.author.name %> - <%= pkg.author.url %>\n\n' +
    'Site:     <%= pkg.homepage %>\n' +
    'Issues:   <%= pkg.bugs.url %>\n' +
    'License:  <%= pkg.license %>\n\n' +
    '*/\n';

function generateBuild() {
    var date = new Date;
    return Math.floor((date - (new Date(date.getFullYear(), 0, 0))) / 1000).toString(36)
}

var build = generateBuild();

gulp.task('lint', function() {
  return gulp.src([
    'src/lib/*.js',
    'src/lib/renderers/*.js',
    'src/renderers/*.js',
    'src/index.js'
  ])
    .pipe(eslint())
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
});

gulp.task('todo', function() {
    return gulp.src([
        'src/lib/*.js',
        'src/lib/renderers/*.js',
        'src/renderers/*.js',
        'src/index.js'
        ])
        .pipe(todo())
        .pipe(gulp.dest('./'));
});

gulp.task('build', ['lint'], function() {
    return gulp.src('src/index.js')
        .pipe(webpack({
            output: {
                library: 'Holder',
                filename: 'holder.js',
                libraryTarget: 'umd'
            }
        }))
        .pipe(gulp.dest('./'));
});

gulp.task('bundle', ['build'], function() {
    return gulp.src([
            'src/lib/vendor/polyfills.js',
            'holder.js',
            'src/meteor/shim.js'
        ])
        .pipe(concat('holder.js'))
        .pipe(gulp.dest('./'));
});

gulp.task('minify', ['bundle'], function() {
    return gulp.src('holder.js')
        .pipe(uglify())
        .pipe(rename('holder.min.js'))
        .pipe(gulp.dest('./'));
});

gulp.task('banner', ['minify'], function() {
    return gulp.src(['holder*.js'])
        .pipe(replace('%version%', pkg.version))
        .pipe(header(banner, {
            pkg: pkg,
            year: moment().format('YYYY'),
            build: build
        }))
        .pipe(gulp.dest('./'));
});

gulp.task('beautify', function() {
    return gulp.src(['src/lib/*.js'])
        .pipe(beautify())
        .pipe(gulp.dest('src/lib/'));
});

gulp.task('meteor', function() {
    return gulp.src('src/meteor/package.js')
        .pipe(replace('%version%', pkg.version))
        .pipe(replace('%summary%', pkg.description))
        .pipe(gulp.dest('./'));
});

gulp.task('watch', function() {
    gulp.watch('src/*.js', ['default']);
});

gulp.task('default', ['bundle', 'minify', 'banner', 'meteor'], function() {
    gulputil.log('Finished build ' + build);
    build = generateBuild();
});