Create extension

README.md

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+![Chrome extension in action](showcase.gif?raw=true "SGA extension in action")
+
+Use this extension when deciding subjects for next semester. 
+
+Don't waste your time looking up every subject by its code to find out its schedules.
+
+## Installation
+1. Clone the repo
+2. [Load extension](https://developer.chrome.com/extensions/getstarted#unpacked)
+
+## Usage
+1. Go to SGA
+2. Click on Legajo > Datos del Alumno > Analítico de notas
+3. Refresh page and watch the shortcuts appear
+

background.js

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+let subjectCode = null
+let nextStep = null;
+
+chrome.extension.onMessage.addListener(function(request, sender, sendResponse) {
+  switch(request.type) {
+    case 'storeSubjectCode':
+      subjectCode = request.subjectCode
+      nextStep = 'searchSubject'
+      sendResponse({})
+      break
+    case 'hasSearchedPage':
+      nextStep = 'clickResults'
+      sendResponse({})
+      break
+    case 'hasFoundSubjectPage':
+      nextStep = 'showSchedules'
+      sendResponse({})
+      break
+    case 'requestAction':
+      sendResponse({ nextStep: nextStep, subjectCode: subjectCode })
+      break
+    case 'stop':
+      subjectCode = null
+      nextStep = null
+      break
+  }
+});

contentscript.js

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+const send = (request, callback = (response => {})) => (
+  chrome.extension.sendMessage(request, callback)
+)
+
+const getLink = (text) => (
+  Array.from(document.querySelectorAll('a')).filter(a => a.innerText === text)[0]
+)
+
+const createShortcutLinks = () => {
+  Array.from(document.querySelectorAll('.subjectBackground')).forEach(e => { 
+    const cell = e.querySelector('td')
+    const subjectCode = cell.querySelector('span.bold').innerText.match(/[0-9]{2}\.[0-9]{2}/)[0]
+    const link = document.createElement('a')
+    Array.from(cell.childNodes).forEach(child => link.appendChild(child))
+    link.href = '#'
+    link.addEventListener("click", () => openSearchPage(subjectCode), false);
+
+    cell.innerHTML = null
+    cell.appendChild(link)
+  })
+}
+
+const openSearchPage = (subjectCode) => {
+  send({ type: 'storeSubjectCode', subjectCode: subjectCode })
+  window.location = getLink('Cursos').href
+}
+
+const semesterFilterValue = () => {
+  const month = (new Date()).getMonth() + 1
+  if (month > 5 && month < 11) {
+    return 1 // You are looking for second semester info
+  } else {
+    return 0 // You are looking for first semester info
+  }
+}
+
+const searchSubject = (subjectCode) => {
+  // Subject code filter
+  document.querySelector('.filters-tr .filter-td input').value = subjectCode
+
+  // Semester filter
+  Array.from(document.querySelectorAll('.filters-tr .filter-td select')).filter(s => {
+    const options = Array.from(s.querySelectorAll('option')).map(o => o.innerText)
+    return options.includes('Primer Cuat.', 'Segundo Cuat.')
+  })[0].value = semesterFilterValue()
+
+  document.querySelector('a[title=Filtrar]').click()
+  send({ type: 'hasSearchedPage' })
+}
+
+const clickResults = (subjectCode) => {
+  send({ type: 'hasFoundSubjectPage' })
+  document.querySelector('tr img[title="Ver Detalles"]').click()
+}
+
+const showSchedules = () => {
+  send({ type: 'stop' })
+  getLink('Comisiones').click()
+}
+
+send({ type: 'requestAction' }, (response) => {
+  switch (response.nextStep) {
+    case 'searchSubject':
+      searchSubject(response.subjectCode)
+      break;
+    case 'clickResults':
+      clickResults(response.subjectCode)
+      break;
+    case 'showSchedules':
+      showSchedules()
+      break
+  }
+})
+
+createShortcutLinks()

index.js

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+const searchPage = Array.from(document.querySelectorAll('a')).filter(a => a.innerText === 'Cursos')[0]
+
+// Every link
+
+Array.from(document.querySelectorAll('.subjectBackground')).forEach(e => { 
+  const cell = e.querySelector('td');
+  const subjectCode = cell.querySelector('span.bold').innerText.match(/[0-9]{2}\.[0-9]{2}/)[0];
+  cell.innerHTML = `<a href=foo'>${cell.innerHTML}</a>`
+})

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "SGA - Subject Schedule Shortcut",
+  "description": "This extension create shortcuts to subject schedules",
+  "version": "1.0.0",
+  "minimum_chrome_version": "47",
+  "page_action": {
+    "default_icon": {
+      "19": "icon_19.png",
+      "38": "icon_38.png"
+    }
+  },
+  "permissions": [
+    "activeTab"
+  ],
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "content_scripts": [{
+    "matches": [
+      "https://sga.itba.edu.ar/*"
+    ],
+    "js": ["contentscript.js"],
+    "run_at": "document_idle",
+    "all_frames": false
+  }]
+}