Bundling JS with ESBuild (#702)

* add npm dependencies used in this theme

* implement helper to configure JS and ESBuild

* migrate jquery popper.js bootstrap fontawesome to js bundle

* refactor main.js into smaller pieces, and moved navbar.js to assets

* remove list.js. It adjusts post card height to be the same, but is actually not needed.

* refactored notes.js, search.js, single.js into application.js

* move ityped to js asset, implement experiences horizontal vertical line in css

* align recent post height via css

* migrated home.js and refactored into various sections

* migrated darkMode feature to js bundle

* moved mermaid feature to js bundle

* migrate syntax highlight to js bundle

* migrate katex ( js portion ) to js bundle

* migrate pdf-js to js bundle by delegating to cdn

* set explicit comparisions for feature envvars so js can properly optimize

* removed goat-counter

* more fixes for broken achievements and small bugs

* more bug fixes

* allow configuration of hightlight.js, fix video-player shortcode

* remove jquery all together

* add null handling and fix merge conflicts

Co-authored-by: Aaron Qian <aaron@yeet.io>

assets/scripts/application.js

@@ -0,0 +1,8 @@
+import 'popper.js'
+import 'bootstrap'
+import '@fortawesome/fontawesome-free/js/all'
+
+import './core'
+import './features'
+import './sections'
+import './pages'

assets/scripts/core/device.js

@@ -0,0 +1,36 @@
+let deviceState = {
+  isMobile: false,
+  isTablet: false,
+  isLaptop: false
+}
+
+function detectDeviceState () {
+  if (window.innerWidth <= 425) {
+    deviceState = {
+      isMobile: true,
+      isTablet: false,
+      isLaptop: false
+    }
+  } else if (window.innerWidth <= 768) {
+    deviceState = {
+      isMobile: false,
+      isTablet: true,
+      isLaptop: false
+    }
+  } else {
+    deviceState = {
+      isMobile: false,
+      isTablet: false,
+      isLaptop: true
+    }
+  }
+}
+
+detectDeviceState()
+window.addEventListener('resize', detectDeviceState)
+
+// returns a copy of the device state
+// so other parts of code can't override this.
+export function getDeviceState () {
+  return { ...deviceState }
+}

assets/scripts/core/index.js

@@ -0,0 +1,2 @@
+export * from './device'
+export * from './insertScript'

assets/scripts/core/insertScript.js

@@ -0,0 +1,14 @@
+export const insertScript = (id, src, onload) => {
+  // script is already inserted, do nothing
+  if (document.getElementById(id)) return
+
+  // insert script
+  const firstScriptTag = document.getElementsByTagName('script')[0]
+  const scriptTag = document.createElement('script')
+  scriptTag.id = id
+  scriptTag.onload = onload
+  scriptTag.src = src
+  scriptTag.defer = true
+  scriptTag.async = true
+  firstScriptTag.parentNode.insertBefore(scriptTag, firstScriptTag)
+}

assets/scripts/features/darkmode/darkreader.js

@@ -0,0 +1,30 @@
+import { enable, disable, auto, setFetchMethod } from 'darkreader'
+import * as params from '@params'
+
+const darkreader = params?.darkmode?.darkreader || {}
+const defaultColorScheme = darkreader.defaultColorScheme || 'system'
+const theme = {
+  brightness: 100,
+  contrast: 100,
+  sepia: 0,
+  ...(darkreader.theme || {})
+}
+const fixes = {
+  invert: ['img[src$=".svg"]'],
+  ...(darkreader.fixes || {})
+}
+setFetchMethod(window.fetch)
+
+export function setSchemeDark () {
+  enable(theme, fixes)
+}
+
+export function setSchemeLight () {
+  disable()
+}
+
+export function setSchemeSystem () {
+  auto(theme, fixes)
+}
+
+export { defaultColorScheme }

assets/scripts/features/darkmode/index.js

@@ -0,0 +1,60 @@
+const PERSISTENCE_KEY = 'darkmode:color-scheme'
+
+async function getService () {
+  if (process.env.FEATURE_DARKMODE_DARKREADER === '1') {
+    return await import('./darkreader')
+  }
+
+  throw Error(' No service defined for feature darkMode.')
+}
+
+window.addEventListener('DOMContentLoaded', async () => {
+  const menu = document.getElementById('themeMenu')
+  const $icon = document.getElementById('navbar-theme-icon-svg')
+  if (menu == null || $icon == null) return
+
+  const btns = menu.getElementsByTagName('a')
+  const iconMap = Array.from(btns).reduce((map, btn) => {
+    const $img = btn.getElementsByTagName('img')[0]
+    map[btn.dataset.scheme] = $img.src
+    return map
+  }, {})
+
+  const {
+    setSchemeDark,
+    setSchemeLight,
+    setSchemeSystem,
+    defaultColorScheme
+  } = await getService()
+
+  function loadScheme () {
+    return localStorage.getItem(PERSISTENCE_KEY) || defaultColorScheme
+  }
+
+  function saveScheme (scheme) {
+    localStorage.setItem(PERSISTENCE_KEY, scheme)
+  }
+
+  function setScheme (newScheme) {
+    $icon.src = iconMap[newScheme]
+
+    if (newScheme === 'dark') {
+      setSchemeDark()
+    } else if (newScheme === 'system') {
+      setSchemeSystem()
+    } else {
+      setSchemeLight()
+    }
+
+    saveScheme(newScheme)
+  }
+
+  setScheme(loadScheme())
+
+  Array.from(menu.getElementsByTagName('a')).forEach((btn) => {
+    btn.addEventListener('click', () => {
+      const { scheme } = btn.dataset
+      setScheme(scheme)
+    })
+  })
+})

assets/scripts/features/embedpdf/index.js

@@ -0,0 +1,165 @@
+import { insertScript } from '../../core'
+
+const PDFJS_BUNDLE = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@3.0.279/build/pdf.min.js'
+const WORKER_BUNDLE = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@3.0.279/build/pdf.worker.min.js'
+
+class PDFViewer {
+  constructor (el) {
+    const {
+      url,
+      hidePaginator,
+      hideLoader,
+      scale,
+      pageNum
+    } = el.dataset
+
+    if (url == null) {
+      throw new Error('Cannot load PDF! Attribute `data-url` is not set.')
+    }
+
+    // props
+    this.url = url
+    this.hidePaginator = hidePaginator !== 'false'
+    this.hideLoader = hideLoader !== 'false'
+    this.scale = scale || 3
+
+    // initial state
+    this.pageNum = parseInt(pageNum, 10) || 1
+    this.loaded = false
+    this.pageRendering = false
+    this.pageNumPending = null
+
+    // DOM elements
+    this.canvas = el.getElementsByClassName('pdf-canvas')[0]
+    if (this.canvas == null) {
+      throw new Error('canvas element not found!')
+    };
+    this.paginator = el.getElementsByClassName('paginator')[0]
+    this.loadingWrapper = el.getElementsByClassName('loading-wrapper')[0]
+    this.next = el.getElementsByClassName('next')[0]
+    this.prev = el.getElementsByClassName('prev')[0]
+    this.pageNum = el.getElementsByClassName('page-num')[0]
+    this.pageCount = el.getElementsByClassName('page-count')[0]
+
+    // context
+    this.ctx = this.canvas.getContext('2d')
+
+    // events
+    this.next.addEventListener('click', this.handleNextPage.bind(this))
+    this.prev.addEventListener('click', this.handlePrevPage.bind(this))
+
+    this.showPaginator()
+    this.showLoader()
+    this.loadPDF()
+  }
+
+  /**
+   * If we haven't disabled the loader, show loader and hide canvas
+   */
+  showLoader () {
+    if (this.hideLoader) return
+    this.loadingWrapper.style.display = 'flex'
+    this.canvas.style.display = 'none'
+  }
+
+  /**
+   * If we haven't disabled the paginator, show paginator
+   */
+  showPaginator () {
+    if (this.hidePaginator) return
+    this.paginator.style.display = 'block'
+  }
+
+  /**
+   * Hides loader and shows canvas
+   */
+  showContent () {
+    this.loadingWrapper.style.display = 'none'
+    this.canvas.style.display = 'block'
+  }
+
+  /**
+   * Asynchronously downloads PDF.
+   */
+  async loadPDF () {
+    this.pdfDoc = await window.pdfjsLib.getDocument(this.url).promise
+
+    this.pageCount.textContent = this.pdfDoc.numPages
+
+    // If the user passed in a number that is out of range, render the last page.
+    if (this.pageNum > this.pdfDoc.numPages) {
+      this.pageNum = this.pdfDoc.numPages
+    }
+
+    this.renderPage(this.pageNum)
+  }
+
+  /**
+   * Get page info from document, resize canvas accordingly, and render page.
+   * @param num Page number.
+   */
+  async renderPage (num) {
+    this.pageRendering = true
+
+    const page = await this.pdfDoc.getPage(num)
+    const viewport = page.getViewport({ scale: this.scale })
+    this.canvas.height = viewport.height
+    this.canvas.width = viewport.width
+
+    // Wait for rendering to finish
+    await page.render({
+      canvasContext: this.ctx,
+      viewport
+    }).promise
+
+    this.pageRendering = false
+    this.showContent()
+
+    if (this.pageNumPending !== null) {
+      // New page rendering is pending
+      this.renderPage(this.pageNumPending)
+      this.pageNumPending = null
+    }
+    // Update page counters
+    this.pageNum.textContent = num
+  }
+
+  /**
+   * If another page rendering in progress, waits until the rendering is
+   * finished. Otherwise, executes rendering immediately.
+   */
+  queueRenderPage (num) {
+    if (this.pageRendering) {
+      this.pageNumPending = num
+    } else {
+      this.renderPage(num)
+    }
+  }
+
+  /**
+   * Displays previous page.
+   */
+  handlePrevPage () {
+    if (this.pageNum <= 1) {
+      return
+    }
+    this.pageNum--
+    this.queueRenderPage(this.pageNum)
+  }
+
+  /**
+   * Displays next page.
+   */
+  handleNextPage () {
+    if (this.pageNum >= this.pdfDoc.numPages) {
+      return
+    }
+    this.pageNum++
+    this.queueRenderPage(this.pageNum)
+  }
+}
+
+insertScript('pdfjs', PDFJS_BUNDLE, () => {
+  window.pdfjsLib.GlobalWorkerOptions.workerSrc = WORKER_BUNDLE
+  Array.from(document.getElementsByClassName('pdf-viewer')).forEach(el => new PDFViewer(el))
+})

assets/scripts/features/flowchart/index.js

@@ -0,0 +1,3 @@
+if (process.env.FEATURE_FLOWCHART_MERMAID === '1') {
+  import('./mermaid')
+}

assets/scripts/features/flowchart/mermaid.js

@@ -0,0 +1,7 @@
+import mermaid from 'mermaid'
+import * as params from '@params'
+
+const mermaidOptions = params.flowchart?.mermaid || {}
+const options = Object.assign({}, mermaidOptions, { startOnLoad: true })
+
+mermaid.initialize(options)

assets/scripts/features/index.js

@@ -0,0 +1,27 @@
+if (process.env.FEATURE_VIDEOPLAYER === '1') {
+  import('./videoplayer')
+}
+
+if (process.env.FEATURE_TOC === '1') {
+  import('./toc')
+}
+
+if (process.env.FEATURE_DARKMODE === '1') {
+  import('./darkmode')
+}
+
+if (process.env.FEATURE_FLOWCHART === '1') {
+  import('./flowchart')
+}
+
+if (process.env.FEATURE_SYNTAXHIGHLIGHT === '1') {
+  import('./syntaxhighlight')
+}
+
+if (process.env.FEATURE_MATH === '1') {
+  import('./math')
+}
+
+if (process.env.FEATURE_EMBEDPDF === '1') {
+  import('./embedpdf')
+}

assets/scripts/features/math/index.js

@@ -0,0 +1,3 @@
+if (process.env.FEATURE_MATH_KATEX === '1') {
+  import('./katex')
+}

assets/scripts/features/math/katex.js

@@ -0,0 +1,21 @@
+import renderMathInElement from 'katex/contrib/auto-render'
+import * as params from '@params'
+
+const defaultOptions = {
+  delimiters: [
+    { left: '$$', right: '$$', display: true },
+    { left: '\\[', right: '\\]', display: true },
+    { left: '$', right: '$', display: false },
+    { left: '\\(', right: '\\)', display: false }
+  ]
+}
+
+window.addEventListener('DOMContentLoaded', () => {
+  renderMathInElement(
+    document.body,
+    {
+      ...defaultOptions,
+      ...(params.math?.katex || {})
+    }
+  )
+})

assets/scripts/features/syntaxhighlight/hljs.js

@@ -0,0 +1,4 @@
+import hljs from 'highlight.js'
+import * as params from '@params'
+
+hljs.highlightAll(params.syntaxhighlight?.hljs)

assets/scripts/features/syntaxhighlight/index.js

@@ -0,0 +1,3 @@
+if (process.env.FEATURE_SYNTAXHIGHLIGHT_HLJS === '1') {
+  import('./hljs')
+}

assets/scripts/features/toc/index.js

@@ -0,0 +1,48 @@
+import { getDeviceState } from '../../core'
+
+// Toggle Table of Contents on click. Here, class "hide" open the toc
+function toggleTOC () {
+  const toc = document.getElementById('toc-section')
+  if (toc == null) {
+    return
+  }
+
+  if (toc.classList.contains('hide')) {
+    toc.classList.remove('hide')
+  } else {
+    // if sidebar-section is open, then close it first
+    const sidebar = document.getElementById('sidebar-section')
+    if (sidebar != null && sidebar.classList.contains('hide')) {
+      sidebar.classList.remove('hide')
+    }
+    // add "hide" class
+    toc.classList.add('hide')
+    // if it is mobile device. then scroll to top.
+    const { isMobile } = getDeviceState()
+    if (isMobile && toc.classList.contains('hide')) {
+      document.body.scrollTop = 0
+      document.documentElement.scrollTop = 0
+    }
+  }
+  if (document.getElementById('hero-area') != null) {
+    document.getElementById('hero-area').classList.toggle('hide')
+  }
+}
+
+window.addEventListener('DOMContentLoaded', () => {
+  // bind click event to #toc-toggle in navbar-2.html
+  const toggle = document.getElementById('toc-toggler')
+  if (toggle) toggle.addEventListener('click', toggleTOC)
+
+  // hide TOC when user clicks on a TOC link.
+  // Only applies if it's mobile.
+  const toc = document.getElementById('TableOfContents')
+  if (toc) {
+    toc.addEventListener('click', (event) => {
+      const { isMobile } = getDeviceState()
+      if (isMobile && event.target.nodeName === 'A') {
+        toggleTOC()
+      }
+    })
+  }
+})

assets/scripts/features/videoplayer/index.js

@@ -0,0 +1,3 @@
+if (process.env.FEATURE_VIDEOPLAYER_PLYR === '1') {
+  import('./plyr')
+}

assets/scripts/features/videoplayer/plyr.js

@@ -0,0 +1,5 @@
+import Plyr from 'plyr'
+import * as params from '@params'
+
+const options = params.videoplayer?.plyr
+window.addEventListener('DOMContentLoaded', () => Plyr.setup('.video-player', options))

assets/scripts/pages/home.js

@@ -0,0 +1,16 @@
+import { init } from 'ityped'
+
+// =========== Typing Carousel ================
+// get data from hidden ul and set as typing data
+document.addEventListener('DOMContentLoaded', () => {
+  const $ul = document.getElementById('typing-carousel-data')?.children
+  if ($ul == null || $ul.length === 0) return
+
+  const strings = Array.from($ul).map($el => $el.textContent)
+
+  init('#ityped', {
+    strings,
+    startDelay: 200,
+    loop: true
+  })
+})

assets/scripts/pages/index.js

@@ -0,0 +1,4 @@
+import './note'
+import './search'
+import './single'
+import './home'

assets/scripts/pages/note.js

@@ -0,0 +1,30 @@
+import imagesLoaded from 'imagesloaded'
+
+document.addEventListener('DOMContentLoaded', function () {
+  function resizeGridItem (item) {
+    const grid = document.getElementsByClassName('note-card-holder')[0]
+    const rowHeight = parseInt(window.getComputedStyle(grid).getPropertyValue('grid-auto-rows'))
+    const rowGap = parseInt(window.getComputedStyle(grid).getPropertyValue('grid-row-gap'))
+    const rowSpan = Math.ceil((item.querySelector('.item').getBoundingClientRect().height + rowGap) / (rowHeight + rowGap))
+    item.style.gridRowEnd = 'span ' + rowSpan
+  }
+
+  function resizeAllGridItems () {
+    const allItems = document.getElementsByClassName('note-card')
+    for (let x = 0; x < allItems.length; x++) {
+      resizeGridItem(allItems[x])
+    }
+  }
+
+  function resizeInstance (instance) {
+    const item = instance.elements[0]
+    resizeGridItem(item)
+  }
+
+  window.addEventListener('resize', resizeAllGridItems)
+
+  const allItems = document.getElementsByClassName('note-card')
+  for (let x = 0; x < allItems.length; x++) {
+    imagesLoaded(allItems[x], resizeInstance)
+  }
+})

assets/scripts/pages/search.js

@@ -0,0 +1,133 @@
+import Fuse from 'fuse.js'
+import Mark from 'mark.js'
+
+window.addEventListener('DOMContentLoaded', () => {
+  const summaryInclude = 60
+
+  const fuseOptions = {
+    shouldSort: true,
+    includeMatches: true,
+    threshold: 0.0,
+    tokenize: true,
+    location: 0,
+    distance: 100,
+    maxPatternLength: 32,
+    minMatchCharLength: 1,
+    keys: [
+      { name: 'title', weight: 0.8 },
+      { name: 'hero', weight: 0.7 },
+      { name: 'summary', weight: 0.6 },
+      { name: 'date', weight: 0.5 },
+      { name: 'contents', weight: 0.5 },
+      { name: 'tags', weight: 0.3 },
+      { name: 'categories', weight: 0.3 }
+    ]
+  }
+
+  const searchQuery = param('keyword')
+  if (searchQuery) {
+    document.getElementById('search-query').value = searchQuery
+    executeSearch(searchQuery)
+  } else {
+    const node = document.createElement('p')
+    node.textContent = 'Please enter a word or phrase above'
+    document.getElementById('search-results')?.append(node)
+  }
+
+  function executeSearch (searchQuery) {
+    const url = window.location.href.split('/search/')[0] + '/index.json'
+
+    fetch(url).then(function (data) {
+      const pages = data
+      const fuse = new Fuse(pages, fuseOptions)
+      const results = fuse.search(searchQuery)
+
+      document.getElementById('search-box').value = searchQuery
+      if (results.length > 0) {
+        populateResults(results)
+      } else {
+        const node = document.createElement('p')
+        node.textContent = 'No matches found'
+        document.getElementById('search-results')?.append(node)
+      }
+    })
+  }
+
+  function populateResults (results) {
+    results.forEach(function (value, key) {
+      const contents = value.item.contents
+      let snippet = ''
+      const snippetHighlights = []
+      if (fuseOptions.tokenize) {
+        snippetHighlights.push(searchQuery)
+      } else {
+        value.matches.forEach(function (mvalue) {
+          if (mvalue.key === 'tags' || mvalue.key === 'categories') {
+            snippetHighlights.push(mvalue.value)
+          } else if (mvalue.key === 'contents') {
+            const start = mvalue.indices[0][0] - summaryInclude > 0 ? mvalue.indices[0][0] - summaryInclude : 0
+            const end = mvalue.indices[0][1] + summaryInclude < contents.length ? mvalue.indices[0][1] + summaryInclude : contents.length
+            snippet += contents.substring(start, end)
+            snippetHighlights.push(mvalue.value.substring(mvalue.indices[0][0], mvalue.indices[0][1] - mvalue.indices[0][0] + 1))
+          }
+        })
+      }
+
+      if (snippet.length < 1) {
+        snippet += contents.substring(0, summaryInclude * 2)
+      }
+      // pull template from hugo template definition
+      const templateDefinition = document.getElementById('search-result-template').innerHTML
+      // replace values
+      const output = render(templateDefinition, {
+        key,
+        title: value.item.title,
+        hero: value.item.hero,
+        date: value.item.date,
+        summary: value.item.summary,
+        link: value.item.permalink,
+        tags: value.item.tags,
+        categories: value.item.categories,
+        snippet
+      })
+
+      const doc = new DOMParser().parseFromString(output, 'text/html')
+      document.getElementById('search-results').append(doc)
+
+      snippetHighlights.forEach(function (snipvalue) {
+        const context = document.getElementById('#summary-' + key)
+        const instance = new Mark(context)
+        instance.mark(snipvalue)
+      })
+    })
+  }
+
+  function param (name) {
+    return decodeURIComponent((location.search.split(name + '=')[1] || '').split('&')[0]).replace(/\+/g, ' ')
+  }
+
+  function render (templateString, data) {
+    let conditionalMatches, copy
+    const conditionalPattern = /\$\{\s*isset ([a-zA-Z]*) \s*\}(.*)\$\{\s*end\s*}/g
+    // since loop below depends on re.lastInxdex, we use a copy to capture any manipulations whilst inside the loop
+    copy = templateString
+    while ((conditionalMatches = conditionalPattern.exec(templateString)) !== null) {
+      if (data[conditionalMatches[1]]) {
+        // valid key, remove conditionals, leave contents.
+        copy = copy.replace(conditionalMatches[0], conditionalMatches[2])
+      } else {
+        // not valid, remove entire section
+        copy = copy.replace(conditionalMatches[0], '')
+      }
+    }
+    templateString = copy
+    // now any conditionals removed we can do simple substitution
+    let key, find, re
+    for (key in data) {
+      find = '\\$\\{\\s*' + key + '\\s*\\}'
+      re = new RegExp(find, 'g')
+      templateString = templateString.replace(re, data[key])
+    }
+    return templateString
+  }
+})

assets/scripts/pages/single.js

@@ -0,0 +1,60 @@
+window.addEventListener('DOMContentLoaded', () => {
+  // =========== Add anchor to the headers ================
+  function addAnchor (element) {
+    element.innerHTML = `<a href="#${element.id}" class="header-anchor">${element.innerHTML}<sup><i class="fas fa-link fa-sm"></i></sup></a>`
+  }
+
+  const postContent = document.getElementById('post-content')
+  if (postContent != null) {
+    const headerTypes = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']
+    for (let i = 0; i < headerTypes.length; i++) {
+      const headers = postContent.querySelectorAll(headerTypes[i])
+      if (headers) {
+        headers.forEach(addAnchor)
+      }
+    }
+  }
+
+  // =============== Make TOC Compatible wit Bootstrap Scroll Spy ========
+  // add "navbar" class to the "nav" element
+  const toc = document.getElementById('TableOfContents')
+  if (toc) {
+    toc.classList.add('navbar')
+    // add "nav-pills" class to the "ul" elements
+    let elems = toc.getElementsByTagName('ul')
+    for (let i = 0; i < elems.length; i++) {
+      elems[i].classList.add('nav-pills')
+    }
+    // add "nav-item" class to the "li" elements
+    elems = toc.getElementsByTagName('li')
+    for (let i = 0; i < elems.length; i++) {
+      elems[i].classList.add('nav-item')
+    }
+    // add "nav-link" class to the "a" elements
+    elems = toc.getElementsByTagName('a')
+    for (let i = 0; i < elems.length; i++) {
+      elems[i].classList.add('nav-link')
+    }
+  }
+
+  // add scroll to top button
+  const btn = document.getElementById('scroll-to-top')
+
+  if(btn) {
+    window.addEventListener('scroll', function () {
+      if (window.scrollY > 300) {
+        btn.classList.add('show')
+      } else {
+        btn.classList.remove('show')
+      }
+    })
+  
+    btn.addEventListener('click', function (e) {
+      e.preventDefault()
+      window.scrollTo({
+        top: 0,
+        behavior: 'smooth'
+      })
+    })
+  }
+})

assets/scripts/process-shim.js

@@ -0,0 +1,3 @@
+export const process = {
+  env: {}
+}

assets/scripts/sections/achievements.js

@@ -0,0 +1,220 @@
+import { getDeviceState } from '../core'
+
+function fourColumRow (gallery, entries, i) {
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-lg-6', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry1)
+  i++
+
+  const entry2 = document.createElement('div')
+  entry2.classList.add('col-lg-3', 'm-0', 'p-0')
+  entry2.appendChild(entries[i].cloneNode(true))
+  entry2.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry2)
+  i++
+
+  const entry3 = document.createElement('div')
+  entry3.classList.add('col-lg-3', 'm-0', 'p-0')
+  entry3.appendChild(entries[i].cloneNode(true))
+  entry3.children[0].classList.add('img-type-2')
+  i++
+  entry3.appendChild(entries[i].cloneNode(true))
+  entry3.children[1].classList.add('img-type-2')
+  gallery.appendChild(entry3)
+  i++
+}
+
+function fourColumnReversedRow (gallery, entries, i) {
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-lg-3', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-2')
+  i++
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[1].classList.add('img-type-2')
+  gallery.appendChild(entry1)
+  i++
+
+  const entry2 = document.createElement('div')
+  entry2.classList.add('col-lg-3', 'm-0', 'p-0')
+  entry2.appendChild(entries[i].cloneNode(true))
+  entry2.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry2)
+  i++
+
+  const entry3 = document.createElement('div')
+  entry3.classList.add('col-lg-6', 'm-0', 'p-0')
+  entry3.appendChild(entries[i].cloneNode(true))
+  entry3.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry3)
+  i++
+}
+
+function threeColumnRow (gallery, entries, i) {
+  console.log(i)
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-lg-6', 'col-md-6', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry1)
+  i++
+
+  const entry2 = document.createElement('div')
+  entry2.classList.add('col-lg-3', 'col-md-3', 'm-0', 'p-0')
+  entry2.appendChild(entries[i].cloneNode(true))
+  entry2.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry2)
+  i++
+
+  const entry3 = document.createElement('div')
+  entry3.classList.add('col-lg-3', 'col-md-3', 'm-0', 'p-0')
+  entry3.appendChild(entries[i].cloneNode(true))
+  entry3.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry3)
+  i++
+}
+
+function threeColumnReversedRow (gallery, entries, i) {
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-lg-3', 'col-md-3', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry1)
+  i++
+
+  const entry2 = document.createElement('div')
+  entry2.classList.add('col-lg-3', 'col-md-3', 'm-0', 'p-0')
+  entry2.appendChild(entries[i].cloneNode(true))
+  entry2.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry2)
+  i++
+
+  const entry3 = document.createElement('div')
+  entry3.classList.add('col-lg-6', 'col-md-3', 'm-0', 'p-0')
+  entry3.appendChild(entries[i].cloneNode(true))
+  entry3.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry3)
+  i++
+}
+
+function twoColumnRow (gallery, entries, i) {
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-6', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry1)
+  i++
+
+  const entry2 = document.createElement('div')
+  entry2.classList.add('col-6', 'm-0', 'p-0')
+  entry2.appendChild(entries[i].cloneNode(true))
+  entry2.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry2)
+  i++
+}
+
+function singleColumnRow (gallery, entries, i) {
+  const entry1 = document.createElement('div')
+  entry1.classList.add('col-12', 'm-0', 'p-0')
+  entry1.appendChild(entries[i].cloneNode(true))
+  entry1.children[0].classList.add('img-type-1')
+  gallery.appendChild(entry1)
+  i++
+}
+
+function showAchievements () {
+  const { isLaptop, isTablet } = getDeviceState()
+  // show achievements from achievements-holder div
+  const gallery = document.getElementById('gallery')
+  if (gallery == null) {
+    return
+  }
+  gallery.innerHTML = ''
+  const entries = document.getElementById('achievements-holder').children
+  let len = entries.length
+  let i = 0
+  let rowNumber = 1
+  while (i < len) {
+    if (isLaptop) {
+      if (i + 4 <= len) {
+        if (rowNumber % 2) {
+          fourColumRow(gallery, entries, i)
+        } else {
+          fourColumnReversedRow(gallery, entries, i)
+        }
+        i += 4
+      } else if (i + 3 <= len) {
+        if (rowNumber % 2) {
+          threeColumnRow(gallery, entries, i)
+        } else {
+          threeColumnReversedRow(gallery, entries, i)
+        }
+        i += 3
+      } else if (i + 2 <= len) {
+        twoColumnRow(gallery, entries, i)
+        i += 2
+      } else {
+        singleColumnRow(gallery, entries, i)
+        i++
+      }
+    } else if (isTablet) {
+      if (i + 2 <= len) {
+        twoColumnRow(gallery, entries, i)
+        i += 2
+      } else {
+        singleColumnRow(gallery, entries, i)
+        i++
+      }
+    } else {
+      singleColumnRow(gallery, entries, i)
+      i++
+    }
+    rowNumber++
+  }
+
+  // show full image on click
+  const elements = document.getElementsByClassName('achievement-entry')
+  len = elements.length
+  for (let i = 0; i < len; i++) {
+    elements[i].onclick = function () {
+      const achievements = document.getElementsByClassName('achievement-entry')
+      const len2 = achievements.length
+      for (let j = 0; j < len2; j++) {
+        achievements[j].classList.toggle('hidden')
+      }
+      this.classList.toggle('achievement-details')
+      this.classList.toggle('hidden')
+      this.parentElement.classList.toggle('col-lg-12')
+      this.parentElement.classList.toggle('col-md-12')
+      this.parentElement.classList.toggle('col-sm-12')
+      if (this.children.SmallImage.hasAttribute('active')) {
+        const mainLogo = this.children.LargeImage.getAttribute('Style')
+        this.children.LargeImage.setAttribute('active', true)
+        this.children.SmallImage.removeAttribute('active')
+
+        this.setAttribute('Style', mainLogo)
+      } else {
+        const mainLogo = this.children.SmallImage.getAttribute('Style')
+        this.children.SmallImage.setAttribute('active', true)
+        this.children.LargeImage.removeAttribute('active')
+        this.setAttribute('Style', mainLogo)
+      }
+
+      if (this.children.caption !== undefined) {
+        this.children.caption.classList.toggle('hidden')
+      }
+      if (this.children['enlarge-icon'] !== undefined) {
+        this.getElementsByClassName('fa-xmark')[0].classList.toggle('hidden')
+        this.getElementsByClassName('fa-magnifying-glass-plus')[0].classList.toggle('hidden')
+      }
+      if (this.children['achievement-title'] !== undefined) {
+        this.children['achievement-title'].classList.toggle('hidden')
+      }
+    }
+  }
+}
+
+['DOMContentLoaded', 'resize'].forEach((event) =>
+  document.addEventListener(event, showAchievements))

assets/scripts/sections/education.js

@@ -0,0 +1,33 @@
+// Show more rows in the taken courses table
+function toggleCourseVisibility (elem) {
+  // find the courses
+  const courses = elem.parentNode.getElementsByClassName('course')
+  if (courses == null) {
+    return
+  }
+
+  // toggle hidden-course class from the third elements
+  for (const course of courses) {
+    if (course.classList.contains('hidden-course') || course.classList.contains('toggled-hidden-course')) {
+      course.classList.toggle('hidden-course')
+      course.classList.add('toggled-hidden-course')
+    }
+  }
+
+  // toggle the buttons visibility
+  const buttonsToToggle = elem.parentNode.getElementsByClassName('show-more-btn')
+  for (const buttonToToggle of buttonsToToggle) {
+    buttonToToggle.classList.toggle('hidden')
+  }
+}
+
+window.addEventListener('DOMContentLoaded', () => {
+  const els = [
+    document.getElementById('show-more-btn'),
+    document.getElementById('show-less-btn')
+  ]
+
+  els.filter((el) => el != null).forEach((el) =>
+    el.addEventListener('click', ({ target }) =>
+      toggleCourseVisibility(target)))
+})

assets/scripts/sections/index.js

@@ -0,0 +1,7 @@
+import './navbar'
+import './sidebar'
+
+import './education'
+import './achievements'
+import './projects'
+import './publications'

assets/scripts/sections/navbar.js

@@ -0,0 +1,60 @@
+const updateNavBar = () => {
+  const topNavbar = document.getElementById('top-navbar')
+  const navbarToggler = document.getElementById('navbar-toggler')
+  const themeIcon = document.getElementById('navbar-theme-icon-svg')
+
+  if (window.scrollY > 40) {
+    topNavbar?.classList.remove('initial-navbar')
+    topNavbar?.classList.add('final-navbar', 'shadow')
+
+    navbarToggler?.classList.remove('navbar-dark')
+    navbarToggler?.classList.add('navbar-light')
+
+    // color theme selector a.k.a. dark mode
+    themeIcon?.classList.remove('navbar-icon-svg-dark')
+
+    // get the main logo from hidden img tag
+    const mainLogo = document.getElementById('main-logo')
+    if (mainLogo) {
+      const logoURL = mainLogo.getAttribute('src')
+      document.getElementById('logo')?.setAttribute('src', logoURL)
+    }
+  } else {
+    topNavbar?.classList.remove('final-navbar', 'shadow')
+    topNavbar?.classList.add('initial-navbar')
+
+    navbarToggler?.classList.remove('navbar-light')
+    navbarToggler?.classList.add('navbar-dark')
+
+    // color theme selector a.k.a. dark mode
+    themeIcon?.classList.add('navbar-icon-svg-dark')
+
+    // get the inverted logo from hidden img tag
+    const invertedLogo = document.getElementById('inverted-logo')
+    if (invertedLogo) {
+      const logoURL = invertedLogo.getAttribute('src')
+      document.getElementById('logo')?.setAttribute('src', logoURL)
+    }
+  }
+}
+
+document.addEventListener('DOMContentLoaded', function () {
+  // change navbar style on scroll
+  // ==================================================
+  // When the user scrolls down 80px from the top of the document,
+  // resize the navbar's padding and the logo's font size
+  document.addEventListener('scroll', updateNavBar)
+
+  // Creates a click handler to collapse the navigation when
+  // anchors in the mobile nav pop up are clicked
+  const navMain =document.getElementsByClassName('navbar-collapse')
+  Array.from(navMain).forEach(function(el) {
+    el.addEventListener('click', function (e) {
+      if (e.target.tagName === 'A') {
+        el.classList.add('collapse')
+      }
+    })
+  })
+
+  updateNavBar()
+})

assets/scripts/sections/projects.js

@@ -0,0 +1,19 @@
+import Filterizr from 'filterizr'
+import { insertScript } from '../core'
+
+document.addEventListener('DOMContentLoaded', () => {
+  // ================== Project cards =====================
+
+  // setup project filter buttons
+  const projectCardHolder = document.getElementById('project-card-holder')
+  if (projectCardHolder != null && projectCardHolder.children.length !== 0) {
+    // eslint-disable-next-line no-new
+    new Filterizr('.filtr-projects', {
+      layout: 'sameWidth',
+      controlsSelector: '.project-filtr-control'
+    })
+  }
+})
+
+// dynamically insert github buttons script.
+insertScript('github-buttons', 'https://buttons.github.io/buttons.js')

assets/scripts/sections/publications.js

@@ -0,0 +1,13 @@
+import Filterizr from 'filterizr'
+
+document.addEventListener('DOMContentLoaded', () => {
+  const publicationCardHolder = document.getElementById('publication-card-holder')
+  if (publicationCardHolder != null && publicationCardHolder.children.length !== 0) {
+    // eslint-disable-next-line no-new
+    new Filterizr('.filtr-publications', {
+      layout: 'sameWidth',
+      gridItemsSelector: '.pub-filtr-item',
+      controlsSelector: '.pub-filtr-control'
+    })
+  }
+})

assets/scripts/sections/sidebar.js

@@ -0,0 +1,38 @@
+import { getDeviceState } from '../core/device'
+
+// Toggle sidebar on click. Here, class "hide" open the sidebar
+function toggleSidebar () {
+  const sidebar = document.getElementById('sidebar-section')
+  if (sidebar == null) {
+    return
+  }
+  if (sidebar.classList.contains('hide')) {
+    sidebar.classList.remove('hide')
+  } else {
+    // if toc-section is open, then close it first
+    const toc = document.getElementById('toc-section')
+    if (toc != null && toc.classList.contains('hide')) {
+      toc.classList.remove('hide')
+    }
+    // add "hide" class
+    sidebar.classList.add('hide')
+    // if it is mobile device. then scroll to top.
+    const { isMobile } = getDeviceState()
+    if (isMobile && sidebar.classList.contains('hide')) {
+      document.body.scrollTop = 0
+      document.documentElement.scrollTop = 0
+      if (document.getElementById('hero-area') != null) {
+        document.getElementById('hero-area').classList.toggle('hide')
+      }
+    }
+  }
+  if (document.getElementById('content-section') != null) {
+    document.getElementById('content-section').classList.toggle('hide')
+  }
+}
+
+window.addEventListener('DOMContentLoaded', () => {
+  // bind click event to #sidebar-toggler in navbar-2.html
+  const toggle = document.getElementById('sidebar-toggler')
+  if (toggle) toggle.addEventListener('click', toggleSidebar)
+})