// https://github.com/appkr/blog/blob/master/package.json

{
  "devDependencies": {
    "babel-core": "^6.0.15",
    "babel-preset-es2015": "^6.0.15",
    "browser-sync": "^2.9.0",
    "del": "^2.0.2",
    "gulp": "^3.9.0",
    "gulp-autoprefixer": "^3.1.0",
    "gulp-babel": "^6.0.0",
    "gulp-clean": "^0.3.1",
    "gulp-concat": "^2.5.2",
    "gulp-if": "^2.0.0",
    "gulp-imagemin": "^2.0.0",
    "gulp-load-plugins": "^1.0.0",
    "gulp-minify-css": "^1.1.6",
    "gulp-newer": "^1.0.0",
    "gulp-sass": "^2.0.0",
    "gulp-size": "^2.0.0",
    "gulp-sourcemaps": "^1.3.0",
    "gulp-subtree": "^0.1.0",
    "gulp-uglify": "^1.0.1",
    "run-sequence": "^1.0.1"
  }
}

// https://github.com/appkr/blog/blob/master/gulpfile.babel.js
// Referenced from Google Web Starter Kit
// @see https://github.com/google/web-starter-kit

'use strict';

import cp from 'child_process';
import gulp from 'gulp';
import del from 'del';
import runSequence from 'run-sequence';
import browserSync from 'browser-sync';
import gulpLoadPlugins from 'gulp-load-plugins';
import pkg from './package.json';

const $ = gulpLoadPlugins();
const reload = browserSync.reload;

/**
 * Task 'clean' : Clean output directory
 */
gulp.task('clean', cb => del(['.tmp', 'images', 'scripts', 'styles', 'public'], {dot: true}));

/**
 * Task 'jekyll' : Build jekyll sites
 */
gulp.task('jekyll', (done) => {
  return cp.spawn('jekyll', ['build'], {stdio: 'inherit'}).on('close', done);
});

/**
 * Task 'images' : Optimize images
 */
gulp.task('images', () =>
  gulp.src('_assets/images/**/*.*')
  .pipe($.imagemin({progressive: true, interlaced: true}))
  .pipe(gulp.dest('images'))
  .pipe($.size({title: 'images'}))
);

/**
 * Task 'styles' : Compile and automatically prefix stylesheets
 */
gulp.task('styles', () => {
  const AUTOPREFIXER_BROWSERS = [
    'ie >= 10',
    'ie_mob >= 10',
    'ff >= 30',
    'chrome >= 34',
    'safari >= 7',
    'opera >= 23',
    'ios >= 7',
    'android >= 4.4',
    'bb >= 10'
  ];

  return gulp.src([
    '_assets/styles/main.scss'
  ])
  .pipe($.newer('.tmp/styles'))
  .pipe($.sourcemaps.init())
  .pipe($.sass({precision: 10}).on('error', $.sass.logError))
  .pipe($.autoprefixer(AUTOPREFIXER_BROWSERS))
  .pipe(gulp.dest('.tmp/styles'))
  .pipe($.concat('main.min.css'))
  .pipe($.if('*.css', $.minifyCss()))
  .pipe($.size({title: 'styles'}))
  .pipe($.sourcemaps.write('./'))
  .pipe(gulp.dest('styles'));
});

/**
 * Task 'scripts' : Concatenate and minify JavaScript.
 */
gulp.task('scripts', () =>
  gulp.src([
    '_assets/vendor/fastclick/lib/fastclick.js',
    '_assets/vendor/jquery/dist/jquery.js',
    '_assets/vendor/simple-jekyll-search/dest/jekyll-search.js',
    '_assets/vendor/bootstrap-sass/assets/javascripts/bootstrap.js',
    '_assets/vendor/bootstrap-material-design/scripts/material.js',
    '_assets/vendor/bootstrap-material-design/scripts/ripples.js',
    '_assets/scripts/main.js'
  ])
  .pipe($.sourcemaps.init())
  .pipe($.babel())
  .pipe($.sourcemaps.write())
  .pipe(gulp.dest('.tmp/scripts'))
  .pipe($.concat('main.min.js'))
  .pipe($.uglify({preserveComments: 'some'}))
  .pipe($.size({title: 'scripts'}))
  .pipe($.sourcemaps.write('.'))
  .pipe(gulp.dest('scripts'))
);

/**
 * Task 'serve' : Watch files for changes & reload
 */
gulp.task('serve', ['images', 'styles', 'scripts', 'jekyll'], () => {
  browserSync({
    notify: false,
    logPrefix: 'Jekyll',
    server: ['public'],
    port: 3000
  });

  gulp.watch(['_assets/styles/**/*.{scss,css}'], ['styles', 'jekyll', reload]);
  gulp.watch(['_assets/scripts/**/*.js'], ['scripts', 'jekyll', reload]);
  gulp.watch(['_assets/images/**/*'], ['images', 'jekyll', reload]);
  gulp.watch(['**/*.{html,md,markdown}', '!public/**/*.*'], ['jekyll', reload]);
});

/**
 * Task 'default' : Build production files, the default task
 */
gulp.task('default', [], cb => runSequence('styles', 'scripts', 'images', 'jekyll', cb));

/**
 * Task 'deploy' : This will run the build task, then push it to the gh-pages branch
 */
gulp.task('deploy', [], () => {
  cp.spawn('sed', ['-i', "''", 's/public/#public/', '.gitignore'], { stdio: 'inherit' });
  gulp.src('public').pipe($.subtree());
  return cp.spawn('git', ['checkout', '.gitignore'], { stdio: 'inherit' });
});