Revision history

src/components/App.vue

@@ -21,6 +21,10 @@ import store from '../store';
 Vue.directive('focus', {
   inserted(el) {
     el.focus();
+    const value = el.value;
+    if (value && el.setSelectionRange) {
+      el.setSelectionRange(0, value.length);
+    }
   },
 });
 

src/components/CodeEditor.vue

@@ -16,11 +16,11 @@ export default {
     }
     if (scrollElt) {
       const clEditor = cledit(preElt, scrollElt);
+      clEditor.on('contentChanged', value => this.$emit('changed', value));
       clEditor.init({
         content: this.value,
         sectionHighlighter: section => Prism.highlight(section.text, Prism.languages[this.lang]),
       });
-      clEditor.on('contentChanged', value => this.$emit('changed', value));
       clEditor.toggleEditable(!this.disabled);
     }
   },

src/components/Layout.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="layout">
+  <div class="layout" :class="{'layout--revision': revisionContent}">
     <div class="layout__panel flex flex--row" :class="{'flex--end': styles.showSideBar}">
       <div class="layout__panel layout__panel--explorer" v-show="styles.showExplorer" :aria-hidden="!styles.showExplorer" :style="{width: styles.layoutOverflow ? '100%' : constants.explorerWidth + 'px'}">
         <explorer></explorer>
@@ -75,6 +75,9 @@ export default {
     FindReplace,
   },
   computed: {
+    ...mapState('content', [
+      'revisionContent',
+    ]),
     ...mapState('discussion', [
       'stickyComment',
     ]),
@@ -155,11 +158,6 @@ $editor-background: #fff;
   .sticky-comment,
   .current-discussion {
     background-color: mix(#000, $editor-background, 6.7%);
-  }
-
-  .comment-list__current-discussion,
-  .sticky-comment,
-  .current-discussion {
     border-color: $editor-background;
   }
 }
@@ -177,11 +175,6 @@ $preview-background: #f3f3f3;
   .sticky-comment,
   .current-discussion {
     background-color: mix(#000, $preview-background, 6.7%);
-  }
-
-  .comment-list__current-discussion,
-  .sticky-comment,
-  .current-discussion {
     border-color: $preview-background;
   }
 }

src/components/Modal.vue

@@ -189,7 +189,7 @@ export default {
 
 .modal__inner-2 {
   margin: 40px 10px 100px;
-  background-color: #fff;
+  background-color: #f8f8f8;
   padding: 40px 50px 30px;
   border-radius: $border-radius-base;
   position: relative;

src/components/NavigationBar.vue

@@ -1,88 +1,58 @@
 <template>
-  <nav class="navigation-bar" :class="{'navigation-bar--editor': styles.showEditor}">
+  <nav class="navigation-bar" :class="{'navigation-bar--editor': styles.showEditor && !revisionContent}">
+    <!-- Explorer -->
     <div class="navigation-bar__inner navigation-bar__inner--left navigation-bar__inner--button">
-      <button class="navigation-bar__button button" @click="toggleExplorer()" v-title="'Toggle explorer'">
+      <button class="navigation-bar__button button" @click="toggleExplorer()" v-title="'Toggle explorer'"><icon-folder></icon-folder></button>
-        <icon-folder></icon-folder>
-      </button>
     </div>
+    <!-- Side bar -->
     <div class="navigation-bar__inner navigation-bar__inner--right navigation-bar__inner--button">
-      <button class="navigation-bar__button navigation-bar__button--stackedit button" @click="toggleSideBar()" v-title="'Toggle side bar'">
+      <button class="navigation-bar__button navigation-bar__button--stackedit button" @click="toggleSideBar()" v-title="'Toggle side bar'"><icon-provider provider-id="stackedit"></icon-provider></button>
-        <icon-provider provider-id="stackedit"></icon-provider>
-      </button>
     </div>
     <div class="navigation-bar__inner navigation-bar__inner--right navigation-bar__inner--title flex flex--row">
+      <!-- Spinner -->
       <div class="navigation-bar__spinner">
         <div v-if="!offline && showSpinner" class="spinner"></div>
         <icon-sync-off v-if="offline"></icon-sync-off>
       </div>
+      <!-- Title -->
       <div class="navigation-bar__title navigation-bar__title--fake text-input"></div>
       <div class="navigation-bar__title navigation-bar__title--text text-input" :style="{width: titleWidth + 'px'}">{{title}}</div>
       <input class="navigation-bar__title navigation-bar__title--input text-input" :class="{'navigation-bar__title--focus': titleFocus, 'navigation-bar__title--scrolling': titleScrolling}" :style="{width: titleWidth + 'px'}" @focus="editTitle(true)" @blur="editTitle(false)" @keyup.enter="submitTitle()" @keyup.esc="submitTitle(true)" @mouseenter="titleHover = true" @mouseleave="titleHover = false" v-model="title">
+      <!-- Sync/Publish -->
       <div class="flex flex--row" :class="{'navigation-bar__hidden': styles.hideLocations}">
-        <a class="navigation-bar__button navigation-bar__button--location button" :class="{'navigation-bar__button--blink': location.id === currentLocation.id}" v-for="location in syncLocations" :key="location.id" :href="location.url" target="_blank" v-title="'Synchronized location'">
+        <a class="navigation-bar__button navigation-bar__button--location button" :class="{'navigation-bar__button--blink': location.id === currentLocation.id}" v-for="location in syncLocations" :key="location.id" :href="location.url" target="_blank" v-title="'Synchronized location'"><icon-provider :provider-id="location.providerId"></icon-provider></a>
-          <icon-provider :provider-id="location.providerId"></icon-provider>
+        <button class="navigation-bar__button navigation-bar__button--sync button" :disabled="!isSyncPossible || isSyncRequested || offline" @click="requestSync" v-title="'Synchronize now'"><icon-sync></icon-sync></button>
-        </a>
+        <a class="navigation-bar__button navigation-bar__button--location button" :class="{'navigation-bar__button--blink': location.id === currentLocation.id}" v-for="location in publishLocations" :key="location.id" :href="location.url" target="_blank" v-title="'Publish location'"><icon-provider :provider-id="location.providerId"></icon-provider></a>
-        <button class="navigation-bar__button navigation-bar__button--sync button" :disabled="!isSyncPossible || isSyncRequested || offline" @click="requestSync" v-title="'Synchronize now'">
+        <button class="navigation-bar__button navigation-bar__button--publish button" :disabled="!publishLocations.length || isPublishRequested || offline" @click="requestPublish"v-title="'Publish now'"><icon-upload></icon-upload></button>
-          <icon-sync></icon-sync>
+      </div>
-        </button>
+      <!-- Revision -->
-        <a class="navigation-bar__button navigation-bar__button--location button" :class="{'navigation-bar__button--blink': location.id === currentLocation.id}" v-for="location in publishLocations" :key="location.id" :href="location.url" target="_blank" v-title="'Publish location'">
+      <div class="flex flex--row" v-if="revisionContent">
-          <icon-provider :provider-id="location.providerId"></icon-provider>
+        <button class="navigation-bar__button navigation-bar__button--revision navigation-bar__button--restore button" @click="restoreRevision">Restore</button>
-        </a>
+        <button class="navigation-bar__button navigation-bar__button--revision button" @click="setRevisionContent()" v-title="'Close revision'"><icon-close></icon-close></button>
-        <button class="navigation-bar__button navigation-bar__button--publish button" :disabled="!publishLocations.length || isPublishRequested || offline" @click="requestPublish"v-title="'Publish now'">
-          <icon-upload></icon-upload>
-        </button>
       </div>
     </div>
     <div class="navigation-bar__inner navigation-bar__inner--edit-buttons">
-      <button class="navigation-bar__button button" @click="undo" v-title="'Undo'" :disabled="!canUndo">
+      <button class="navigation-bar__button button" @click="undo" v-title="'Undo'" :disabled="!canUndo"><icon-undo></icon-undo></button>
-        <icon-undo></icon-undo>
+      <button class="navigation-bar__button button" @click="redo" v-title="'Redo'" :disabled="!canRedo"><icon-redo></icon-redo></button>
-      </button>
-      <button class="navigation-bar__button button" @click="redo" v-title="'Redo'" :disabled="!canRedo">
-        <icon-redo></icon-redo>
-      </button>
       <div class="navigation-bar__spacer"></div>
-      <button class="navigation-bar__button button" @click="pagedownClick('bold')" v-title="'Bold'">
+      <button class="navigation-bar__button button" @click="pagedownClick('bold')" v-title="'Bold'"><icon-format-bold></icon-format-bold></button>
-        <icon-format-bold></icon-format-bold>
+      <button class="navigation-bar__button button" @click="pagedownClick('italic')" v-title="'Italic'"><icon-format-italic></icon-format-italic></button>
-      </button>
+      <button class="navigation-bar__button button" @click="pagedownClick('strikethrough')" v-title="'Strikethrough'"><icon-format-strikethrough></icon-format-strikethrough></button>
-      <button class="navigation-bar__button button" @click="pagedownClick('italic')" v-title="'Italic'">
+      <button class="navigation-bar__button button" @click="pagedownClick('heading')" v-title="'Heading'"><icon-format-size></icon-format-size></button>
-        <icon-format-italic></icon-format-italic>
+      <button class="navigation-bar__button button" @click="pagedownClick('ulist')" v-title="'Unordered list'"><icon-format-list-bulleted></icon-format-list-bulleted></button>
-      </button>
+      <button class="navigation-bar__button button" @click="pagedownClick('olist')" v-title="'Ordered list'"><icon-format-list-numbers></icon-format-list-numbers></button>
-      <button class="navigation-bar__button button" @click="pagedownClick('strikethrough')" v-title="'Strikethrough'">
+      <button class="navigation-bar__button button" @click="pagedownClick('table')" v-title="'Table'"><icon-table></icon-table></button>
-        <icon-format-strikethrough></icon-format-strikethrough>
+      <button class="navigation-bar__button button" @click="pagedownClick('quote')" v-title="'Blockquote'"><icon-format-quote-close></icon-format-quote-close></button>
-      </button>
+      <button class="navigation-bar__button button" @click="pagedownClick('code')" v-title="'Code'"><icon-code-tags></icon-code-tags></button>
-      <button class="navigation-bar__button button" @click="pagedownClick('heading')" v-title="'Heading'">
+      <button class="navigation-bar__button button" @click="pagedownClick('link')" v-title="'Link'"><icon-link-variant></icon-link-variant></button>
-        <icon-format-size></icon-format-size>
+      <button class="navigation-bar__button button" @click="pagedownClick('image')" v-title="'Image'"><icon-file-image></icon-file-image></button>
-      </button>
+      <button class="navigation-bar__button button" @click="pagedownClick('hr')" v-title="'Horizontal rule'"><icon-format-horizontal-rule></icon-format-horizontal-rule></button>
-      <button class="navigation-bar__button button" @click="pagedownClick('ulist')" v-title="'Unordered list'">
-        <icon-format-list-bulleted></icon-format-list-bulleted>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('olist')" v-title="'Ordered list'">
-        <icon-format-list-numbers></icon-format-list-numbers>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('table')" v-title="'Table'">
-        <icon-table></icon-table>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('quote')" v-title="'Blockquote'">
-        <icon-format-quote-close></icon-format-quote-close>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('code')" v-title="'Code'">
-        <icon-code-tags></icon-code-tags>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('link')" v-title="'Link'">
-        <icon-link-variant></icon-link-variant>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('image')" v-title="'Image'">
-        <icon-file-image></icon-file-image>
-      </button>
-      <button class="navigation-bar__button button" @click="pagedownClick('hr')" v-title="'Horizontal rule'">
-        <icon-format-horizontal-rule></icon-format-horizontal-rule>
-      </button>
     </div>
   </nav>
 </template>
 
 <script>
-import { mapState, mapGetters, mapActions } from 'vuex';
+import { mapState, mapMutations, mapGetters, mapActions } from 'vuex';
 import editorSvc from '../services/editorSvc';
 import syncSvc from '../services/syncSvc';
 import publishSvc from '../services/publishSvc';
@@ -109,6 +79,9 @@ export default {
       'canUndo',
       'canRedo',
     ]),
+    ...mapState('content', [
+      'revisionContent',
+    ]),
     ...mapGetters('layout', [
       'styles',
     ]),
@@ -155,6 +128,12 @@ export default {
     },
   },
   methods: {
+    ...mapMutations('content', [
+      'setRevisionContent',
+    ]),
+    ...mapActions('content', [
+      'restoreRevision',
+    ]),
     ...mapActions('data', [
       'toggleExplorer',
       'toggleSideBar',
@@ -176,9 +155,7 @@ export default {
       }
     },
     pagedownClick(name) {
-      if (this.$store.getters['content/current'].id &&
+      if (this.$store.getters['content/isCurrentEditable']) {
-        this.$store.getters['layout/styles'].showEditor
-      ) {
         editorSvc.pagedownEditor.uiManager.doClick(name);
       }
     },
@@ -292,8 +269,30 @@ $button-size: 36px;
   }
 }
 
+.navigation-bar__button--revision {
+  width: 38px;
+
+  &:first-child {
+    margin-left: 10px;
+  }
+
+  &:last-child {
+    margin-right: 10px;
+  }
+}
+
+.navigation-bar__button--restore {
+  width: auto;
+}
+
 .navigation-bar__title {
   margin: 0 4px;
+  font-size: 22px;
+
+  .layout--revision & {
+    position: absolute;
+    left: -9999px;
+  }
 }
 
 .navigation-bar__title,
@@ -301,7 +300,6 @@ $button-size: 36px;
   display: inline-block;
   color: $navbar-color;
   background-color: transparent;
-  font-size: 22px;
 }
 
 .navigation-bar__button--sync,
@@ -385,6 +383,10 @@ $button-size: 36px;
   }
 }
 
+.navigation-bar__button--revision {
+  display: inline-block;
+}
+
 .navigation-bar__title--input {
   cursor: pointer;
 

src/components/SideBar.vue

@@ -15,6 +15,7 @@
       <main-menu v-if="panel === 'menu'"></main-menu>
       <sync-menu v-else-if="panel === 'sync'"></sync-menu>
       <publish-menu v-else-if="panel === 'publish'"></publish-menu>
+      <history-menu v-else-if="panel === 'history'"></history-menu>
       <export-menu v-else-if="panel === 'export'"></export-menu>
       <more-menu v-else-if="panel === 'more'"></more-menu>
       <div v-else-if="panel === 'help'" class="side-bar__panel side-bar__panel--help">
@@ -34,6 +35,7 @@ import Toc from './Toc';
 import MainMenu from './menus/MainMenu';
 import SyncMenu from './menus/SyncMenu';
 import PublishMenu from './menus/PublishMenu';
+import HistoryMenu from './menus/HistoryMenu';
 import ExportMenu from './menus/ExportMenu';
 import MoreMenu from './menus/MoreMenu';
 import markdownSample from '../data/markdownSample.md';
@@ -45,6 +47,7 @@ const panelNames = {
   toc: 'Table of contents',
   sync: 'Synchronize',
   publish: 'Publish',
+  history: 'File history',
   export: 'Export to disk',
   more: 'More',
 };
@@ -55,6 +58,7 @@ export default {
     MainMenu,
     SyncMenu,
     PublishMenu,
+    HistoryMenu,
     ExportMenu,
     MoreMenu,
   },
@@ -90,6 +94,7 @@ export default {
   hr {
     margin: 10px 40px;
     display: none;
+    border-top: 1px solid $hr-color;
   }
 
   * + hr {

src/components/UserImage.vue

@@ -24,6 +24,7 @@ export default {
 .user-image {
   width: 100%;
   height: 100%;
+  background-color: #fff;
   background-repeat: no-repeat;
   background-position: center;
   background-size: contain;

src/components/common/PreviewClassApplier.js

@@ -37,20 +37,24 @@ export default class PreviewClassApplier {
 
   applyClass() {
     const offset = this.offsetGetter();
-    if (offset && offset.start !== offset.end) {
+    if (offset) {
-      const start = cledit.Utils.findContainer(
+      const offsetStart = editorSvc.getPreviewOffset(offset.start, editorSvc.sectionDescList);
-        editorSvc.previewElt, Math.min(offset.start, offset.end));
+      const offsetEnd = editorSvc.getPreviewOffset(offset.end, editorSvc.sectionDescList);
-      const end = cledit.Utils.findContainer(
+      if (offsetStart != null && offsetEnd != null && offsetStart !== offsetEnd) {
-        editorSvc.previewElt, Math.max(offset.start, offset.end));
+        const start = cledit.Utils.findContainer(
-      const range = document.createRange();
+          editorSvc.previewElt, Math.min(offsetStart, offsetEnd));
-      range.setStart(start.container, start.offsetInContainer);
+        const end = cledit.Utils.findContainer(
-      range.setEnd(end.container, end.offsetInContainer);
+          editorSvc.previewElt, Math.max(offsetStart, offsetEnd));
-      const properties = {
+        const range = document.createRange();
-        ...this.properties,
+        range.setStart(start.container, start.offsetInContainer);
-        className: this.classGetter().join(' '),
+        range.setEnd(end.container, end.offsetInContainer);
-      };
+        const properties = {
-      utils.wrapRange(range, properties);
+          ...this.properties,
-      this.lastEltCount = this.eltCollection.length;
+          className: this.classGetter().join(' '),
+        };
+        utils.wrapRange(range, properties);
+        this.lastEltCount = this.eltCollection.length;
+      }
     }
   }
 

src/components/common/app.scss

@@ -113,7 +113,7 @@ textarea {
 }
 
 .textfield {
-  background-color: transparent;
+  background-color: #fff;
   border: 0;
   font-family: inherit;
   font-weight: 400;
@@ -131,7 +131,7 @@ textarea {
 
   &[disabled] {
     cursor: not-allowed;
-    background-color: #f8f8f8;
+    background-color: #f2f2f2;
     color: #999;
   }
 }
@@ -164,6 +164,10 @@ textarea {
   align-items: center;
 }
 
+.user-name {
+  font-weight: 600;
+}
+
 .side-title {
   height: 44px;
   line-height: 36px;
@@ -210,6 +214,10 @@ textarea {
   position: absolute;
   top: 0;
   height: 100%;
+
+  & > * {
+    border-left: 2px solid transparent;
+  }
 }
 
 .gutter__background {

src/components/common/base.scss

@@ -9,7 +9,7 @@
 
 html,
 body {
-  color: rgba(0, 0, 0, 0.75);
+  color: $body-color;
   font-size: 16px;
   font-family: $font-family-main;
   font-variant-ligatures: common-ligatures;

src/components/common/variables.scss

@@ -1,5 +1,6 @@
 $font-family-main: Lato, 'Helvetica Neue', Helvetica, sans-serif;
 $font-family-monospace: 'Roboto Mono', 'Lucida Sans Typewriter', 'Lucida Console', monaco, Courrier, monospace;
+$body-color: rgba(0, 0, 0, 0.75);
 $line-height-base: 1.67;
 $line-height-title: 1.33;
 $font-size-monospace: 0.85em;
@@ -9,7 +10,7 @@ $selection-highlighting-color: #ff9632;
 $info-bg: transparentize($selection-highlighting-color, 0.85);
 $code-border-radius: 2px;
 $link-color: #0c93e4;
-$error-color: #f20;
+$error-color: #f31;
 $border-radius-base: 2px;
 $hr-color: rgba(128, 128, 128, 0.2);
 $navbar-color: rgba(255, 255, 255, 0.67);

src/components/gutters/CommentList.vue

@@ -163,6 +163,14 @@ export default {
       () => this.updateStickyTrigger,
       () => this.updateSticky(),
       { immediate: true });
+
+    // Move preview discussions once sectionDescWithDiffsList have been calculated
+    if (!editorSvc.sectionDescWithDiffsList) {
+      editorSvc.$once('sectionDescWithDiffsList', () => {
+        this.updateTops();
+        this.updateSticky();
+      });
+    }
   },
   destroyed() {
     this.scrollerElt.removeEventListener('scroll', this.updateSticky);
@@ -199,10 +207,6 @@ export default {
   }
 }
 
-.user-name {
-  font-weight: 600;
-}
-
 /* use div selector to avoid collision with Prism */
 div.comment {
   padding: 5px 10px 10px;

src/components/gutters/EditorNewDiscussionButton.vue

@@ -21,7 +21,11 @@ export default {
       clearTimeout(this.timeout);
       this.timeout = setTimeout(() => {
         let offset;
-        if (editorSvc.clEditor.selectionMgr.hasFocus()) {
+        // Show the button if content is not a revision and has the focus
+        if (
+          !this.$store.state.content.revisionContent &&
+          editorSvc.clEditor.selectionMgr.hasFocus()
+        ) {
           this.selection = editorSvc.getTrimmedSelection();
           if (this.selection) {
             const text = editorSvc.clEditor.getContent();

src/components/gutters/PreviewNewDiscussionButton.vue

@@ -21,7 +21,11 @@ export default {
       clearTimeout(this.timeout);
       this.timeout = setTimeout(() => {
         let offset;
-        if (editorSvc.previewSelectionRange) {
+        // Show the button if content is not a revision and preview selection is not empty
+        if (
+          !this.$store.state.content.revisionContent &&
+          editorSvc.previewSelectionRange
+        ) {
           this.selection = editorSvc.getTrimmedSelection();
           if (this.selection) {
             const text = editorSvc.previewTextWithDiffsList;

src/components/menus/HistoryMenu.vue

@@ -0,0 +1,260 @@
+<template>
+  <div class="side-bar__panel side-bar__panel--history">
+    <a class="revision button flex flex--row" href="javascript:void(0)" v-for="revision in revisions" :key="revision.id" @click="open(revision)">
+      <div class="revision__icon">
+        <user-image :user-id="revision.sub"></user-image>
+      </div>
+      <div class="revision__header flex flex--column">
+        <user-name :user-id="revision.sub"></user-name>
+        <div class="revision__created">{{revision.created | formatTime}}</div>
+      </div>
+    </a>
+    <div class="flex flex--row flex--end" v-if="showMoreButton">
+      <button class="revision__button button" @click="showMore">More</button>
+    </div>
+  </div>
+</template>
+
+<script>
+import { mapMutations } from 'vuex';
+import googleDriveAppDataProvider from '../../services/providers/googleDriveAppDataProvider';
+import MenuEntry from './common/MenuEntry';
+import UserImage from '../UserImage';
+import UserName from '../UserName';
+import EditorClassApplier from '../common/EditorClassApplier';
+import PreviewClassApplier from '../common/PreviewClassApplier';
+import utils from '../../services/utils';
+import editorSvc from '../../services/editorSvc';
+
+let editorClassAppliers = [];
+let previewClassAppliers = [];
+
+let cachedFileId;
+let revisionsPromise;
+let revisionContentPromises;
+const pageSize = 50;
+
+export default {
+  components: {
+    MenuEntry,
+    UserImage,
+    UserName,
+  },
+  data: () => ({
+    allRevisions: [],
+    showCount: pageSize,
+  }),
+  computed: {
+    revisions() {
+      return this.allRevisions.slice(0, this.showCount);
+    },
+    showMoreButton() {
+      return this.showCount < this.allRevisions.length;
+    },
+  },
+  methods: {
+    ...mapMutations('content', [
+      'setRevisionContent',
+    ]),
+    close() {
+      this.$store.dispatch('data/setSideBarPanel', 'menu');
+    },
+    showMore() {
+      this.showCount += pageSize;
+    },
+    open(revision) {
+      let revisionContentPromise = revisionContentPromises[revision.id];
+      if (!revisionContentPromise) {
+        revisionContentPromise = new Promise((resolve, reject) => {
+          const loginToken = this.$store.getters['data/loginToken'];
+          const currentFile = this.$store.getters['file/current'];
+          this.$store.dispatch('queue/enqueue',
+            () => Promise.resolve()
+              .then(() => googleDriveAppDataProvider.getRevisionContent(
+                loginToken, currentFile.id, revision.id))
+              .then(resolve, reject));
+        });
+        revisionContentPromises[revision.id] = revisionContentPromise;
+        revisionContentPromise.catch(() => {
+          revisionContentPromises[revision.id] = null;
+        });
+      }
+      revisionContentPromise.then(revisionContent =>
+        this.$store.dispatch('content/setRevisionContent', revisionContent));
+    },
+    refreshHighlighters() {
+      const revisionContent = this.$store.state.content.revisionContent;
+      editorClassAppliers.forEach(editorClassApplier => editorClassApplier.stop());
+      editorClassAppliers = [];
+      previewClassAppliers.forEach(previewClassApplier => previewClassApplier.stop());
+      previewClassAppliers = [];
+      if (revisionContent) {
+        editorSvc.$once('sectionDescWithDiffsList', () => {
+          let offset = 0;
+          revisionContent.diffs.forEach(([type, text]) => {
+            if (type) {
+              const classes = ['revision-diff', `revision-diff--${type > 0 ? 'insert' : 'delete'}`];
+              const offsets = {
+                start: offset,
+                end: offset + text.length,
+              };
+              editorClassAppliers.push(new EditorClassApplier(
+                [`revision-diff--${utils.uid()}`, ...classes], offsets));
+              previewClassAppliers.push(new PreviewClassApplier(
+                [`revision-diff--${utils.uid()}`, ...classes], offsets));
+            }
+            offset += text.length;
+          });
+        });
+      }
+    },
+  },
+  created() {
+    // Watch file changes
+    this.$watch(
+      () => this.$store.getters['file/current'].id,
+      (id) => {
+        this.allRevisions = [];
+        if (id) {
+          if (id !== cachedFileId) {
+            this.setRevisionContent();
+            cachedFileId = id;
+            revisionContentPromises = {};
+            const loginToken = this.$store.getters['data/loginToken'];
+            const currentFile = this.$store.getters['file/current'];
+            revisionsPromise = new Promise((resolve, reject) => {
+              this.$store.dispatch('queue/enqueue',
+                () => Promise.resolve()
+                  .then(() => googleDriveAppDataProvider.listRevisions(loginToken, currentFile.id))
+                  .then((revisions) => {
+                    resolve(revisions.sort(
+                      (revision1, revision2) => revision2.created - revision1.created));
+                  })
+                  .catch(reject));
+            });
+            revisionsPromise.catch(() => {
+              cachedFileId = null;
+              return [];
+            });
+          }
+          revisionsPromise.then((revisions) => {
+            this.allRevisions = revisions;
+          });
+        }
+      }, { immediate: true });
+
+    // Watch diffs changes
+    this.$watch(
+      () => this.$store.state.content.revisionContent,
+      () => this.refreshHighlighters());
+
+    // Close revision
+    this.onKeyup = (evt) => {
+      if (evt.which === 27) {
+        // Esc key
+        this.setRevisionContent();
+      }
+    };
+    window.addEventListener('keyup', this.onKeyup);
+  },
+  destroyed() {
+    // Close revision
+    this.setRevisionContent();
+    // Remove highlighters
+    this.refreshHighlighters();
+    // Remove event listener
+    window.removeEventListener('keyup', this.onKeyup);
+  },
+};
+</script>
+
+<style lang="scss">
+@import '../common/variables.scss';
+
+.side-bar__panel--history {
+  padding: 5px 5px 50px;
+}
+
+.revision {
+  text-align: left;
+  padding: 15px;
+  height: auto;
+  text-transform: none;
+  position: relative;
+
+  &::before {
+    content: '';
+    position: absolute;
+    height: 100%;
+    top: 0;
+    left: 24px;
+    border-left: 2px solid $hr-color;
+  }
+
+  &:active,
+  &:focus,
+  &:hover {
+    &::before {
+      display: none;
+    }
+  }
+
+  &:first-child::before {
+    height: 67%;
+    top: 33%;
+  }
+}
+
+.revision__icon {
+  height: 20px;
+  width: 20px;
+  margin-right: 12px;
+  flex: none;
+  border-radius: $border-radius-base;
+  overflow: hidden;
+  position: relative;
+}
+
+.revision__header {
+  font-size: 15px;
+  width: 100%;
+}
+
+.revision__created {
+  font-size: 0.75em;
+  opacity: 0.5;
+}
+
+.revision__button {
+  font-size: 14px;
+  margin-top: 0.5em;
+}
+
+.layout--revision {
+  .cledit-section *,
+  .cl-preview-section * {
+    color: rgba(0, 0, 0, 0.15) !important;
+  }
+
+  .cledit-section .revision-diff {
+    color: $editor-color !important;
+  }
+
+  .cl-preview-section .revision-diff {
+    color: $body-color !important;
+  }
+
+  .revision-diff {
+    padding: 0.25em 0;
+
+    &.revision-diff--insert {
+      background-color: mix(#fff, $selection-highlighting-color, 60%);
+    }
+
+    &.revision-diff--delete {
+      background-color: mix(#fff, $error-color, 60%);
+      text-decoration: line-through;
+    }
+  }
+}
+</style>

src/components/menus/MainMenu.vue

@@ -28,6 +28,12 @@
       <div>File properties</div>
       <span>Add metadata and configure extensions.</span>
     </menu-entry>
+    <menu-entry @click.native="history">
+      <icon-history slot="icon"></icon-history>
+      <div>File history</div>
+      <span>Track and restore file revisions.</span>
+    </menu-entry>
+    <hr>
     <menu-entry @click.native="setPanel('toc')">
       <icon-toc slot="icon"></icon-toc>
       Table of contents
@@ -113,6 +119,17 @@ export default {
       return this.$store.dispatch('modal/open', 'fileProperties')
         .catch(() => {}); // Cancel
     },
+    history() {
+      const loginToken = this.$store.getters['data/loginToken'];
+      if (!loginToken) {
+        this.$store.dispatch('modal/signInForHistory')
+          .then(() => googleHelper.signin())
+          .then(() => syncSvc.requestSync())
+          .catch(() => { }); // Cancel
+      } else {
+        this.setPanel('history');
+      }
+    },
     print() {
       print();
     },

src/components/menus/common/MenuEntry.vue

@@ -1,5 +1,5 @@
 <template>
-  <a href="javascript:void(0)" class="menu-entry button flex flex--row flex--align-center">
+  <a class="menu-entry button flex flex--row flex--align-center" href="javascript:void(0)">
     <div class="menu-entry__icon flex flex--column flex--center">
       <slot name="icon"></slot>
     </div>
@@ -17,6 +17,7 @@
   padding: 10px;
   height: auto;
   font-size: 17px;
+  line-height: 1.5;
   text-transform: none;
 
   div div {

src/components/modals/common/ModalInner.vue

@@ -53,7 +53,7 @@ export default {
   position: absolute;
   top: 8px;
   right: 8px;
-  color: rgba(0, 0, 0, 0.2);
+  color: rgba(0, 0, 0, 0.5);
   width: 30px;
   height: 30px;
   padding: 2px;
@@ -61,7 +61,7 @@ export default {
   &:active,
   &:focus,
   &:hover {
-    color: rgba(0, 0, 0, 0.3);
+    color: rgba(0, 0, 0, 0.67);
   }
 }
 

src/icons/History.vue

@@ -0,0 +1,5 @@
+<template>
+  <svg xmlns="http://www.w3.org/2000/svg" class="icon" viewBox="0 0 24 24">
+    <path d="M11,7V12.11L15.71,14.9L16.5,13.62L12.5,11.25V7M12.5,2C8.97,2 5.91,3.92 4.27,6.77L2,4.5V11H8.5L5.75,8.25C6.96,5.73 9.5,4 12.5,4C16.64,4 20,7.36 20,11.5C20,15.64 16.64,19 12.5,19C9.23,19 6.47,16.91 5.44,14H3.34C4.44,18.03 8.11,21 12.5,21C17.74,21 22,16.75 22,11.5C22,6.25 17.75,2 12.5,2Z" />
+  </svg>
+</template>

src/icons/index.js

@@ -47,6 +47,7 @@ import Undo from './Undo';
 import Redo from './Redo';
 import ContentSave from './ContentSave';
 import Message from './Message';
+import History from './History';
 
 Vue.component('iconProvider', Provider);
 Vue.component('iconFormatBold', FormatBold);
@@ -96,3 +97,4 @@ Vue.component('iconUndo', Undo);
 Vue.component('iconRedo', Redo);
 Vue.component('iconContentSave', ContentSave);
 Vue.component('iconMessage', Message);
+Vue.component('iconHistory', History);

src/services/editorSvc.js

@@ -124,9 +124,17 @@ const editorSvc = Object.assign(new Vue(), editorSvcDiscussions, editorSvcUtils,
       for (let i = 0; i < item[1].length; i += 1) {
         const section = this.conversionCtx.sectionList[sectionIdx];
         if (item[0] === 0) {
-          const sectionDesc = this.sectionDescList[sectionDescIdx];
+          let sectionDesc = this.sectionDescList[sectionDescIdx];
           sectionDescIdx += 1;
-          sectionDesc.editorElt = section.elt;
+          if (sectionDesc.editorElt !== section.elt) {
+            // Force textToPreviewDiffs computation
+            sectionDesc = {
+              ...sectionDesc,
+              section,
+              editorElt: section.elt,
+              textToPreviewDiffs: null,
+            };
+          }
           newSectionDescList.push(sectionDesc);
           previewHtml += sectionDesc.html;
           sectionIdx += 1;
@@ -230,7 +238,8 @@ const editorSvc = Object.assign(new Vue(), editorSvcDiscussions, editorSvcUtils,
   }, 500),
 
   /**
-   * Make the diff between editor's markdown and preview's html.
+   * Compute the diffs between editor's markdown and preview's html
+   * asynchronously unless there is only one section to compute.
    */
   makeTextToPreviewDiffs() {
     if (editorSvc.sectionDescList &&
@@ -244,7 +253,9 @@ const editorSvc = Object.assign(new Vue(), editorSvcDiscussions, editorSvcUtils,
               if (hasOne) {
                 return true;
               }
-              sectionDesc.previewText = sectionDesc.previewElt.textContent;
+              if (!sectionDesc.previewText) {
+                sectionDesc.previewText = sectionDesc.previewElt.textContent;
+              }
               sectionDesc.textToPreviewDiffs = diffMatchPatch.diff_main(
                 sectionDesc.section.text, sectionDesc.previewText);
               hasOne = true;
@@ -540,7 +551,7 @@ const editorSvc = Object.assign(new Vue(), editorSvcDiscussions, editorSvcUtils,
 
     // Disable editor if hidden or if no content is loaded
     store.watch(
-      () => store.getters['content/current'].id && store.getters['layout/styles'].showEditor,
+      () => store.getters['content/isCurrentEditable'],
       editable => this.clEditor.toggleEditable(!!editable), {
         immediate: true,
       });

src/services/editorSvcDiscussions.js

@@ -217,26 +217,28 @@ export default {
     store.watch(
       () => store.getters['discussion/currentFileDiscussions'],
       (discussions) => {
+        const classGetter = (type, discussionId) => () => {
+          const classes = [`discussion-${type}-highlighting--${discussionId}`, `discussion-${type}-highlighting`];
+          if (store.state.discussion.currentDiscussionId === discussionId) {
+            classes.push(`discussion-${type}-highlighting--selected`);
+          }
+          return classes;
+        };
+        const offsetGetter = discussionId => () => {
+          const startMarker = discussionMarkers[`${discussionId}:start`];
+          const endMarker = discussionMarkers[`${discussionId}:end`];
+          return startMarker && endMarker && {
+            start: startMarker.offset,
+            end: endMarker.offset,
+          };
+        };
+
         // Editor class appliers
         const oldEditorClassAppliers = editorClassAppliers;
         editorClassAppliers = {};
         Object.keys(discussions).forEach((discussionId) => {
           const classApplier = oldEditorClassAppliers[discussionId] || new EditorClassApplier(
-            () => {
+            classGetter('editor', discussionId), offsetGetter(discussionId), { discussionId });
-              const classes = [`discussion-editor-highlighting--${discussionId}`, 'discussion-editor-highlighting'];
-              if (store.state.discussion.currentDiscussionId === discussionId) {
-                classes.push('discussion-editor-highlighting--selected');
-              }
-              return classes;
-            },
-            () => {
-              const startMarker = discussionMarkers[`${discussionId}:start`];
-              const endMarker = discussionMarkers[`${discussionId}:end`];
-              return startMarker && endMarker && {
-                start: startMarker.offset,
-                end: endMarker.offset,
-              };
-            }, { discussionId });
           editorClassAppliers[discussionId] = classApplier;
         });
         Object.keys(oldEditorClassAppliers).forEach((discussionId) => {
@@ -250,21 +252,7 @@ export default {
         previewClassAppliers = {};
         Object.keys(discussions).forEach((discussionId) => {
           const classApplier = oldPreviewClassAppliers[discussionId] || new PreviewClassApplier(
-            () => {
+            classGetter('preview', discussionId), offsetGetter(discussionId), { discussionId });
-              const classes = [`discussion-preview-highlighting--${discussionId}`, 'discussion-preview-highlighting'];
-              if (store.state.discussion.currentDiscussionId === discussionId) {
-                classes.push('discussion-preview-highlighting--selected');
-              }
-              return classes;
-            },
-            () => {
-              const startMarker = discussionMarkers[`${discussionId}:start`];
-              const endMarker = discussionMarkers[`${discussionId}:end`];
-              return startMarker && endMarker && {
-                start: this.getPreviewOffset(startMarker.offset),
-                end: this.getPreviewOffset(endMarker.offset),
-              };
-            }, { discussionId });
           previewClassAppliers[discussionId] = classApplier;
         });
         Object.keys(oldPreviewClassAppliers).forEach((discussionId) => {

src/services/editorSvcUtils.js

@@ -52,12 +52,14 @@ export default {
   restoreScrollPosition() {
     const scrollPosition = store.getters['contentState/current'].scrollPosition;
     if (scrollPosition && this.sectionDescMeasuredList) {
-      const objectToScroll = this.getObjectToScroll();
       const sectionDesc = this.sectionDescMeasuredList[scrollPosition.sectionIdx];
       if (sectionDesc) {
-        const scrollTop = sectionDesc[objectToScroll.dimensionKey].startOffset +
+        const editorScrollTop = sectionDesc.editorDimension.startOffset +
-          (sectionDesc[objectToScroll.dimensionKey].height * scrollPosition.posInSection);
+          (sectionDesc.editorDimension.height * scrollPosition.posInSection);
-        objectToScroll.elt.scrollTop = Math.floor(scrollTop);
+        this.editorElt.parentNode.scrollTop = Math.floor(editorScrollTop);
+        const previewScrollTop = sectionDesc.previewDimension.startOffset +
+          (sectionDesc.previewDimension.height * scrollPosition.posInSection);
+        this.previewElt.parentNode.scrollTop = Math.floor(previewScrollTop);
       }
     }
   },
@@ -65,13 +67,17 @@ export default {
   /**
    * Get the offset in the preview corresponding to the offset of the markdown in the editor
    */
-  getPreviewOffset(editorOffset) {
+  getPreviewOffset(editorOffset, sectionDescList = this.sectionDescWithDiffsList) {
-    if (!this.sectionDescWithDiffsList) {
+    if (!sectionDescList) {
       return null;
     }
     let offset = editorOffset;
     let previewOffset = 0;
-    this.sectionDescWithDiffsList.some((sectionDesc) => {
+    sectionDescList.some((sectionDesc) => {
+      if (!sectionDesc.textToPreviewDiffs) {
+        previewOffset = null;
+        return true;
+      }
       if (sectionDesc.section.text.length >= offset) {
         previewOffset += diffMatchPatch.diff_xIndex(sectionDesc.textToPreviewDiffs, offset);
         return true;
@@ -86,13 +92,17 @@ export default {
   /**
    * Get the offset of the markdown in the editor corresponding to the offset in the preview
    */
-  getEditorOffset(previewOffset) {
+  getEditorOffset(previewOffset, sectionDescList = this.sectionDescWithDiffsList) {
-    if (!this.sectionDescWithDiffsList) {
+    if (!sectionDescList) {
       return null;
     }
     let offset = previewOffset;
     let editorOffset = 0;
-    this.sectionDescWithDiffsList.some((sectionDesc) => {
+    sectionDescList.some((sectionDesc) => {
+      if (!sectionDesc.textToPreviewDiffs) {
+        editorOffset = null;
+        return true;
+      }
       if (sectionDesc.previewText.length >= offset) {
         const previewToTextDiffs = sectionDesc.textToPreviewDiffs
           .map(diff => [-diff[0], diff[1]]);

src/services/optional/shortcuts.js

@@ -4,8 +4,7 @@ import editorSvc from '../../services/editorSvc';
 import syncSvc from '../../services/syncSvc';
 
 // Skip shortcuts if modal is open or editor is hidden
-Mousetrap.prototype.stopCallback = () => store.getters['modal/config'] ||
+Mousetrap.prototype.stopCallback = () => store.getters['modal/config'] || !store.getters['content/isCurrentEditable'];
-  !store.getters['content/current'].id || !store.getters['layout/styles'].showEditor;
 
 const pagedownHandler = name => () => {
   editorSvc.pagedownEditor.uiManager.doClick(name);

src/services/providers/googleDriveAppDataProvider.js

@@ -114,4 +114,18 @@ export default providerRegistry.register({
         },
       }));
   },
+  listRevisions(token, fileId) {
+    const syncData = store.getters['data/syncDataByItemId'][`${fileId}/content`];
+    return googleHelper.getFileRevisions(token, syncData.id)
+      .then(revisions => revisions.map(revision => ({
+        id: revision.id,
+        sub: revision.lastModifyingUser && revision.lastModifyingUser.permissionId,
+        created: new Date(revision.modifiedTime).getTime(),
+      })));
+  },
+  getRevisionContent(token, fileId, revisionId) {
+    const syncData = store.getters['data/syncDataByItemId'][`${fileId}/content`];
+    return googleHelper.downloadFileRevision(token, syncData.id, revisionId)
+      .then(content => JSON.parse(content));
+  },
 });

src/services/providers/helpers/googleHelper.js

@@ -337,6 +337,44 @@ export default {
         url: `https://www.googleapis.com/drive/v3/files/${id}`,
       })));
   },
+  getFileRevisions(token, id) {
+    return this.refreshToken(token, driveAppDataScopes)
+      .then((refreshedToken) => {
+        const revisions = [];
+        const getPage = pageToken => this.request(refreshedToken, {
+          method: 'GET',
+          url: `https://www.googleapis.com/drive/v3/files/${id}/revisions`,
+          params: {
+            pageToken,
+            pageSize: 1000,
+            fields: 'nextPageToken,revisions(id,modifiedTime,lastModifyingUser/permissionId,lastModifyingUser/displayName,lastModifyingUser/photoLink)',
+          },
+        }).then((res) => {
+          res.body.revisions.forEach((revision) => {
+            store.commit('userInfo/addItem', {
+              id: revision.lastModifyingUser.permissionId,
+              name: revision.lastModifyingUser.displayName,
+              imageUrl: revision.lastModifyingUser.photoLink,
+            });
+            revisions.push(revision);
+          });
+          if (res.body.nextPageToken) {
+            return getPage(res.body.nextPageToken);
+          }
+          return revisions;
+        });
+
+        return getPage();
+      });
+  },
+  downloadFileRevision(token, fileId, revisionId) {
+    return this.refreshToken(token, driveAppDataScopes)
+      .then(refreshedToken => this.request(refreshedToken, {
+        method: 'GET',
+        url: `https://www.googleapis.com/drive/v3/files/${fileId}/revisions/${revisionId}?alt=media`,
+        raw: true,
+      }).then(res => res.body));
+  },
   uploadBlogger(
     token, blogUrl, blogId, postId, title, content, labels, isDraft, published, isPage,
   ) {

src/services/userSvc.js

@@ -1,4 +1,4 @@
-import googleHelper from '../services/providers/helpers/googleHelper';
+import googleHelper from './providers/helpers/googleHelper';
 import store from '../store';
 
 const promised = {};
@@ -19,8 +19,10 @@ export default {
       if (!store.state.offline) {
         promised[userId] = true;
         googleHelper.getUser(userId)
-          .catch(() => {
+          .catch((err) => {
-            promised[userId] = false;
+            if (err.status !== 404) {
+              promised[userId] = false;
+            }
           });
       }
     }

src/store/content.js

@@ -1,23 +1,103 @@
+import DiffMatchPatch from 'diff-match-patch';
 import moduleTemplate from './moduleTemplate';
 import empty from '../data/emptyContent';
 import utils from '../services/utils';
+import cledit from '../libs/cledit';
+
+const diffMatchPatch = new DiffMatchPatch();
 
 const module = moduleTemplate(empty);
 
+module.state = {
+  ...module.state,
+  revisionContent: null,
+};
+
+module.mutations = {
+  ...module.mutations,
+  setRevisionContent: (state, value) => {
+    if (value) {
+      state.revisionContent = {
+        ...empty(),
+        ...value,
+        id: utils.uid(),
+        hash: Date.now(),
+      };
+    } else {
+      state.revisionContent = null;
+    }
+  },
+};
+
 module.getters = {
   ...module.getters,
-  current: (state, getters, rootState, rootGetters) =>
+  current: (state, getters, rootState, rootGetters) => {
-    state.itemMap[`${rootGetters['file/current'].id}/content`] || empty(),
+    if (state.revisionContent) {
+      return state.revisionContent;
+    }
+    return state.itemMap[`${rootGetters['file/current'].id}/content`] || empty();
+  },
   currentProperties: (state, getters) => utils.computeProperties(getters.current.properties),
+  isCurrentEditable: (state, getters, rootState, rootGetters) =>
+    !state.revisionContent &&
+    getters.current.id &&
+    rootGetters['layout/styles'].showEditor,
 };
 
 module.actions = {
   ...module.actions,
-  patchCurrent({ getters, commit }, value) {
+  patchCurrent({ state, getters, commit }, value) {
-    commit('patchItem', {
+    const id = getters.current.id;
-      ...value,
+    if (id && !state.revisionContent) {
-      id: getters.current.id,
+      commit('patchItem', {
-    });
+        ...value,
+        id,
+      });
+    }
+  },
+  setRevisionContent({ state, rootGetters, commit }, value) {
+    const currentFile = rootGetters['file/current'];
+    const currentContent = state.itemMap[`${currentFile.id}/content`];
+    if (currentContent) {
+      const diffs = diffMatchPatch.diff_main(currentContent.text, value.text);
+      diffMatchPatch.diff_cleanupSemantic(diffs);
+      commit('setRevisionContent', {
+        text: diffs.map(([, text]) => text).join(''),
+        diffs,
+        originalText: value.text,
+      });
+    }
+  },
+  restoreRevision({ state, getters, commit, dispatch }) {
+    const revisionContent = state.revisionContent;
+    if (revisionContent) {
+      dispatch('modal/fileRestoration', null, { root: true })
+        .then(() => {
+          // Close revision
+          commit('setRevisionContent');
+          const currentContent = utils.deepCopy(getters.current);
+          if (currentContent) {
+            // Restore text and move discussions
+            const diffs = diffMatchPatch.diff_main(
+              currentContent.text, revisionContent.originalText);
+            diffMatchPatch.diff_cleanupSemantic(diffs);
+            Object.keys(currentContent.discussions).forEach((discussionId) => {
+              const discussion = currentContent.discussions[discussionId];
+              const adjustOffset = (offsetName) => {
+                const marker = new cledit.Marker(discussion[offsetName], offsetName === 'end');
+                marker.adjustOffset(diffs);
+                discussion[offsetName] = marker.offset;
+              };
+              adjustOffset('start');
+              adjustOffset('end');
+            });
+            dispatch('patchCurrent', {
+              ...currentContent,
+              text: revisionContent.originalText,
+            });
+          }
+        });
+    }
   },
 };
 

src/store/modal.js

@@ -70,6 +70,11 @@ export default {
       content: '<p>Files in the trash are automatically deleted after 7 days of inactivity.</p>',
       resolveText: 'Ok',
     }),
+    fileRestoration: ({ dispatch }) => dispatch('open', {
+      content: '<p>You are about to revert some changes. Are you sure?</p>',
+      resolveText: 'Yes, revert',
+      rejectText: 'No',
+    }),
     reset: ({ dispatch }) => dispatch('open', {
       content: '<p>This will clean your local files and settings. Are you sure?</p>',
       resolveText: 'Yes, clean',
@@ -83,13 +88,19 @@ export default {
     }),
     signInForSponsorship: ({ dispatch }) => dispatch('open', {
       type: 'signInForSponsorship',
-      content: `<p>You have to sign in with <b>Google</b> to enable your sponsorship.</p>
+      content: `<p>You have to sign in with Google to enable your sponsorship.</p>
       <div class="modal__info"><b>Note:</b> This will sync all your files and settings.</div>`,
       resolveText: 'Ok, sign in',
       rejectText: 'Cancel',
     }),
     signInForComment: ({ dispatch }) => dispatch('open', {
-      content: `<p>You have to sign in with <b>Google</b> to start commenting.</p>
+      content: `<p>You have to sign in with Google to start commenting.</p>
+      <div class="modal__info"><b>Note:</b> This will sync all your files and settings.</div>`,
+      resolveText: 'Ok, sign in',
+      rejectText: 'Cancel',
+    }),
+    signInForHistory: ({ dispatch }) => dispatch('open', {
+      content: `<p>You have to sign in with Google to enable revision history.</p>
       <div class="modal__info"><b>Note:</b> This will sync all your files and settings.</div>`,
       resolveText: 'Ok, sign in',
       rejectText: 'Cancel',

src/store/queue.js

@@ -37,7 +37,8 @@ export default {
       }
       const newQueue = queue
         .then(() => checkOffline())
-        .then(() => cb()
+        .then(() => Promise.resolve()
+          .then(() => cb())
           .catch((err) => {
             console.error(err); // eslint-disable-line no-console
             checkOffline();