Refactoring: format code according to Google style guides

Change-Id: I9b6a5c2f1237e0e3f49fed94991168517cb8b8a9
diff --git a/src/js/options.js b/src/js/options.js
index eba0a1a..0f79b2d 100644
--- a/src/js/options.js
+++ b/src/js/options.js
@@ -1,229 +1,226 @@
 function $(selector) {
-    return document.querySelector(selector);
+  return document.querySelector(selector);
 }
 
 function $all(selector) {
-    return document.querySelectorAll(selector);
+  return document.querySelectorAll(selector);
 }
 
 function isEmpty(obj) {
-    return Object.keys(obj).length === 0;
+  return Object.keys(obj).length === 0;
 }
 
 function i18n() {
-    $all('[data-i18n]').forEach(el => {
-        el.innerHTML =
-            chrome.i18n.getMessage('options_' + el.getAttribute('data-i18n'));
-    });
+  $all('[data-i18n]').forEach(el => {
+    el.innerHTML =
+        chrome.i18n.getMessage('options_' + el.getAttribute('data-i18n'));
+  });
 }
 
 function printListModal() {
-    $('#select_language').textContent = '';
-    var heysortable = sortable.toArray();
-    for (var language in isoLangs) {
-        if (!inArray(language, heysortable)) {
-            var el = document.createElement('option');
-            el.setAttribute('value', language);
-            el.innerText = isoLangs[language]['name'] + ' (' +
-                isoLangs[language]['nativeName'] + ')';
-            $('#select_language').appendChild(el);
-        }
+  $('#select_language').textContent = '';
+  var heysortable = sortable.toArray();
+  for (var language in isoLangs) {
+    if (!inArray(language, heysortable)) {
+      var el = document.createElement('option');
+      el.setAttribute('value', language);
+      el.innerText = isoLangs[language]['name'] + ' (' +
+          isoLangs[language]['nativeName'] + ')';
+      $('#select_language').appendChild(el);
     }
+  }
 }
 
 function init() {
-    i18n();
-    chrome.storage.sync.get(null, items => {
-        // If no settings are set
-        if (isEmpty(items)) {
-            items = {
-                translateinto: {},
-                uniquetab: '',
-            };
-            chrome.storage.sync.set(items);
-        }
+  i18n();
+  chrome.storage.sync.get(null, items => {
+    // If no settings are set
+    if (isEmpty(items)) {
+      items = {
+        translateinto: {},
+        uniquetab: '',
+      };
+      chrome.storage.sync.set(items);
+    }
 
-        // Check the checkbox of the window opening
-        if (items.uniquetab === 'yep') $('#uniquetab').checked = true;
-        if (items.uniquetab === '') $('#varioustabs').checked = true;
-        if (items.uniquetab === 'panel') $('#panel').checked = true;
+    // Check the checkbox of the window opening
+    if (items.uniquetab === 'yep') $('#uniquetab').checked = true;
+    if (items.uniquetab === '') $('#varioustabs').checked = true;
+    if (items.uniquetab === 'panel') $('#panel').checked = true;
 
-        // Add event listeners for certain buttons and links
-        $('#panelsflag').addEventListener('click', _ => {
-            event.preventDefault();
-            chrome.tabs.create({url: 'chrome://flags/#enable-panels'});
-        });
-
-        $('#save').addEventListener('click', _ => {
-            saveOptions();
-        });
-
-        // Print selected language list
-        var languages = items.translateinto;
-
-        if (languages) {
-            for (var language_id of Object.keys(languages)) {
-                var language = languages[language_id];
-                var el = document.createElement('li');
-                el.setAttribute('data-language', language);
-                el.setAttribute('data-id', language);
-                el.innerHTML = isoLangs[language]['name'] + ' (' +
-                    isoLangs[language]['nativeName'] + ')' +
-                    '<span data-language=\'' + language +
-                    '\' class=\'delete\'>x</span>';
-                $('#languages').appendChild(el);
-                $('#languages li[data-language=' + language + '] .delete')
-                    .addEventListener('click', function() {
-                        $('#languages')
-                            .removeChild(
-                                $('li[data-language=' +
-                                  this.getAttribute('data-language') + ']'));
-                        printListModal();
-                    });
-            }
-        }
-
-        // Initiate Sortable
-        sortable = new Sortable($('#languages'), {animation: 150});
-
-        // Handling The Dialog
-        $('#languages_add').addEventListener('click', _ => {
-            $('dialog#languages_add_dialog').showModal();
-            $('#select_language').focus();
-        });
-
-        $('#languages_add_cancel').addEventListener('click', _ => {
-            $('dialog#languages_add_dialog').close();
-        });
-
-        $('#languages_add_ok').addEventListener('click', _ => {
-            var el = document.createElement('li');
-            var language = $('#select_language').value;
-            if (inArray(language, sortable.toArray())) {
-                return;
-            }
-            el.setAttribute('data-language', language);
-            el.setAttribute('data-id', language);
-            el.innerHTML = isoLangs[language]['name'] + ' (' +
-                isoLangs[language]['nativeName'] + ')' +
-                '<span data-language=\'' + language +
-                '\' class=\'delete\'>x</span>';
-            $('#languages').appendChild(el);
-            var selection =
-                $('#select_language option[value=' + language + ']');
-            selection.parentNode.removeChild(selection);
-            $('#languages li[data-id=' + language + '] .delete')
-                .addEventListener('click', function() {
-                    $('#languages')
-                        .removeChild(
-                            $('li[data-language=' +
-                              this.getAttribute('data-language') + ']'));
-                    printListModal();
-                });
-            $('dialog').close();
-        });
-
-        // About credits...
-        fetch('json/credits.json')
-            .then(res => res.json())
-            .then(json => {
-                var content = $('dialog#credits_dialog .content_area');
-                json.forEach(item => {
-                    var div = document.createElement('div');
-                    if (item.url) {
-                        var a = document.createElement('a');
-                        a.classList.add('homepage');
-                        a.href = item.url;
-                        a.target = '_blank';
-                        a.textContent =
-                            chrome.i18n.getMessage('options_credits_homepage');
-                        div.append(a);
-                    }
-
-                    var h4 = document.createElement('h4');
-                    h4.textContent = item.name;
-                    div.append(h4);
-
-                    if (item.author) {
-                        var p = document.createElement('p');
-                        p.classList.add('author');
-                        p.textContent =
-                            chrome.i18n.getMessage('options_credits_by') + ' ' +
-                            item.author +
-                            (item.license ? ' - ' + item.license : '');
-                        div.append(p);
-                    }
-                    content.append(div);
-                });
-
-                window.onhashchange = function() {
-                    if (location.hash == '#credits') {
-                        $('dialog#credits_dialog').showModal();
-                        $('#credits_ok').focus();
-                    }
-                };
-
-                if (location.hash == '#credits') {
-                    $('dialog#credits_dialog').showModal();
-                    $('#credits_ok').focus();
-                }
-
-                $('#credits_ok').addEventListener('click', _ => {
-                    $('dialog#credits_dialog').close();
-                });
-                $('dialog#credits_dialog').addEventListener('close', _ => {
-                    history.pushState(
-                        '', document.title,
-                        window.location.pathname + window.location.search);
-                });
-
-                // Print language list in the modal dialog
-                printListModal();
-            })
-            .catch(err => console.log(err));
+    // Add event listeners for certain buttons and links
+    $('#panelsflag').addEventListener('click', _ => {
+      event.preventDefault();
+      chrome.tabs.create({url: 'chrome://flags/#enable-panels'});
     });
+
+    $('#save').addEventListener('click', _ => {
+      saveOptions();
+    });
+
+    // Print selected language list
+    var languages = items.translateinto;
+
+    if (languages) {
+      for (var language_id of Object.keys(languages)) {
+        var language = languages[language_id];
+        var el = document.createElement('li');
+        el.setAttribute('data-language', language);
+        el.setAttribute('data-id', language);
+        el.innerHTML = isoLangs[language]['name'] + ' (' +
+            isoLangs[language]['nativeName'] + ')' +
+            '<span data-language=\'' + language +
+            '\' class=\'delete\'>x</span>';
+        $('#languages').appendChild(el);
+        $('#languages li[data-language=' + language + '] .delete')
+            .addEventListener('click', function() {
+              $('#languages')
+                  .removeChild($(
+                      'li[data-language=' + this.getAttribute('data-language') +
+                      ']'));
+              printListModal();
+            });
+      }
+    }
+
+    // Initiate Sortable
+    sortable = new Sortable($('#languages'), {animation: 150});
+
+    // Handling The Dialog
+    $('#languages_add').addEventListener('click', _ => {
+      $('dialog#languages_add_dialog').showModal();
+      $('#select_language').focus();
+    });
+
+    $('#languages_add_cancel').addEventListener('click', _ => {
+      $('dialog#languages_add_dialog').close();
+    });
+
+    $('#languages_add_ok').addEventListener('click', _ => {
+      var el = document.createElement('li');
+      var language = $('#select_language').value;
+      if (inArray(language, sortable.toArray())) {
+        return;
+      }
+      el.setAttribute('data-language', language);
+      el.setAttribute('data-id', language);
+      el.innerHTML = isoLangs[language]['name'] + ' (' +
+          isoLangs[language]['nativeName'] + ')' +
+          '<span data-language=\'' + language + '\' class=\'delete\'>x</span>';
+      $('#languages').appendChild(el);
+      var selection = $('#select_language option[value=' + language + ']');
+      selection.parentNode.removeChild(selection);
+      $('#languages li[data-id=' + language + '] .delete')
+          .addEventListener('click', function() {
+            $('#languages')
+                .removeChild(
+                    $('li[data-language=' + this.getAttribute('data-language') +
+                      ']'));
+            printListModal();
+          });
+      $('dialog').close();
+    });
+
+    // About credits...
+    fetch('json/credits.json')
+        .then(res => res.json())
+        .then(json => {
+          var content = $('dialog#credits_dialog .content_area');
+          json.forEach(item => {
+            var div = document.createElement('div');
+            if (item.url) {
+              var a = document.createElement('a');
+              a.classList.add('homepage');
+              a.href = item.url;
+              a.target = '_blank';
+              a.textContent =
+                  chrome.i18n.getMessage('options_credits_homepage');
+              div.append(a);
+            }
+
+            var h4 = document.createElement('h4');
+            h4.textContent = item.name;
+            div.append(h4);
+
+            if (item.author) {
+              var p = document.createElement('p');
+              p.classList.add('author');
+              p.textContent = chrome.i18n.getMessage('options_credits_by') +
+                  ' ' + item.author +
+                  (item.license ? ' - ' + item.license : '');
+              div.append(p);
+            }
+            content.append(div);
+          });
+
+          window.onhashchange = function() {
+            if (location.hash == '#credits') {
+              $('dialog#credits_dialog').showModal();
+              $('#credits_ok').focus();
+            }
+          };
+
+          if (location.hash == '#credits') {
+            $('dialog#credits_dialog').showModal();
+            $('#credits_ok').focus();
+          }
+
+          $('#credits_ok').addEventListener('click', _ => {
+            $('dialog#credits_dialog').close();
+          });
+          $('dialog#credits_dialog').addEventListener('close', _ => {
+            history.pushState(
+                '', document.title,
+                window.location.pathname + window.location.search);
+          });
+
+          // Print language list in the modal dialog
+          printListModal();
+        })
+        .catch(err => console.log(err));
+  });
 }
 
 function saveOptions() {
-    var languages = document.getElementById('languages');
-    var options = {
-        uniquetab: '',
-        translateinto: {},
-    };
+  var languages = document.getElementById('languages');
+  var options = {
+    uniquetab: '',
+    translateinto: {},
+  };
 
-    options.uniquetab = radioSelected('uniquetab');
+  options.uniquetab = radioSelected('uniquetab');
 
-    var selected_languages = sortable.toArray();
+  var selected_languages = sortable.toArray();
 
-    var i = 0;
-    for (var language_id in selected_languages) {
-        var language = selected_languages[language_id];
-        options.translateinto[i] = language;
-        i++;
-    }
+  var i = 0;
+  for (var language_id in selected_languages) {
+    var language = selected_languages[language_id];
+    options.translateinto[i] = language;
+    i++;
+  }
 
-    chrome.storage.sync.set(options, function() {
-        var background = chrome.extension.getBackgroundPage();
+  chrome.storage.sync.set(options, function() {
+    var background = chrome.extension.getBackgroundPage();
 
-        background.translator_tab = false;
-        background.translator_window = false;
-        window.close();
-    });
+    background.translator_tab = false;
+    background.translator_window = false;
+    window.close();
+  });
 }
 
 function radioSelected(a) {
-    var elements = document.getElementsByName(a);
+  var elements = document.getElementsByName(a);
 
-    for (var i = 0; i < elements.length; i++)
-        if (elements[i].checked) return elements[i].value;
+  for (var i = 0; i < elements.length; i++)
+    if (elements[i].checked) return elements[i].value;
 }
 
 function inArray(needle, haystack) {
-    var length = haystack.length;
-    for (var i = 0; i < length; i++) {
-        if (haystack[i] == needle) return true;
-    }
-    return false;
+  var length = haystack.length;
+  for (var i = 0; i < length; i++) {
+    if (haystack[i] == needle) return true;
+  }
+  return false;
 }
 
 window.addEventListener('load', init);