Refactored multi-file data structure

This moves away from storing in a single array just to render the table.
It now stores in a multi-dimensional array/object type where each entry
in the array can have its own tree. This makes storing the data for
future feature a little easier as there is only one way to store the
data.

Previously to insert a directory the code had to insert the directory
& then the file at the right point in the array. Now the directory
can be inserted anywhere & then a file can be quickly added into this
directory.

The rendering is still done with a single array, but this is handled
through underscore. Underscore takes the array & then goes through
each item to flatten it into one. It is done this way to save changing
the markup away from table, keeping it as a table keeps it semantically
correct.

17 files changed, 301 insertions, 483 deletions

diff --git a/app/assets/javascripts/repo/components/repo_editor.vue b/app/assets/javascripts/repo/components/repo_editor.vue
index 02d9c775046..5d648de4405 100644
--- a/app/assets/javascripts/repo/components/repo_editor.vue
+++ b/app/assets/javascripts/repo/components/repo_editor.vue
@@ -92,7 +92,7 @@ const RepoEditor = {
     },
 
     blobRaw() {
-      if (Helper.monacoInstance && !this.isTree) {
+      if (Helper.monacoInstance) {
         this.setupEditor();
       }
     },
diff --git a/app/assets/javascripts/repo/components/repo_file.vue b/app/assets/javascripts/repo/components/repo_file.vue
index 8b9cbd23456..6236126fad9 100644
--- a/app/assets/javascripts/repo/components/repo_file.vue
+++ b/app/assets/javascripts/repo/components/repo_file.vue
@@ -1,107 +1,77 @@
 <script>
-import TimeAgoMixin from '../../vue_shared/mixins/timeago';
+  import timeAgoMixin from '../../vue_shared/mixins/timeago';
+  import eventHub from '../event_hub';
+  import repoMixin from '../mixins/repo_mixin';
 
-const RepoFile = {
-  mixins: [TimeAgoMixin],
-  props: {
-    file: {
-      type: Object,
-      required: true,
+  export default {
+    mixins: [
+      repoMixin,
+      timeAgoMixin,
+    ],
+    props: {
+      file: {
+        type: Object,
+        required: true,
+      },
     },
-    isMini: {
-      type: Boolean,
-      required: false,
-      default: false,
+    computed: {
+      fileIcon() {
+        const classObj = {
+          'fa-spinner fa-spin': this.file.loading,
+          [this.file.icon]: !this.file.loading,
+          'fa-folder-open': !this.file.loading && this.file.opened,
+        };
+        return classObj;
+      },
+      levelIndentation() {
+        return {
+          marginLeft: `${this.file.level * 16}px`,
+        };
+      },
     },
-    loading: {
-      type: Object,
-      required: false,
-      default() { return { tree: false }; },
+    methods: {
+      linkClicked(file) {
+        eventHub.$emit('linkclicked', file);
+      },
     },
-    hasFiles: {
-      type: Boolean,
-      required: false,
-      default: false,
-    },
-    activeFile: {
-      type: Object,
-      required: true,
-    },
-  },
-
-  computed: {
-    canShowFile() {
-      return !this.loading.tree || this.hasFiles;
-    },
-
-    fileIcon() {
-      const classObj = {
-        'fa-spinner fa-spin': this.file.loading,
-        [this.file.icon]: !this.file.loading,
-      };
-      return classObj;
-    },
-
-    fileIndentation() {
-      return {
-        'margin-left': `${this.file.level * 10}px`,
-      };
-    },
-
-    activeFileClass() {
-      return {
-        active: this.activeFile.url === this.file.url,
-      };
-    },
-  },
-
-  methods: {
-    linkClicked(file) {
-      this.$emit('linkclicked', file);
-    },
-  },
-};
-
-export default RepoFile;
+  };
 </script>
 
 <template>
-<tr
-  v-if="canShowFile"
-  class="file"
-  :class="activeFileClass"
-  @click.prevent="linkClicked(file)">
-  <td>
-    <i
-      class="fa fa-fw file-icon"
-      :class="fileIcon"
-      :style="fileIndentation"
-      aria-label="file icon">
-    </i>
-    <a
-      :href="file.url"
-      class="repo-file-name"
-      :title="file.url">
-      {{file.name}}
-    </a>
-  </td>
+  <tr
+    class="file"
+    @click.stop="linkClicked(file)">
+    <td>
+      <i
+        class="fa fa-fw file-icon"
+        :class="fileIcon"
+        :style="levelIndentation"
+        aria-hidden="true"
+      >
+      </i>
+      <a
+        :href="file.url"
+        class="repo-file-name"
+      >
+        {{ file.name }}
+      </a>
+    </td>
 
-  <template v-if="!isMini">
-    <td class="hidden-sm hidden-xs">
-      <div class="commit-message">
-        <a @click.stop :href="file.lastCommitUrl">
-          {{file.lastCommitMessage}}
+    <template v-if="!isMini">
+      <td class="hidden-sm hidden-xs">
+        <a
+          @click.stop
+          :href="file.lastCommit.url"
+        >
+          {{ file.lastCommit.message }}
         </a>
-      </div>
-    </td>
+      </td>
 
-    <td class="hidden-xs text-right">
-      <span
-        class="commit-update"
-        :title="tooltipTitle(file.lastCommitUpdate)">
-        {{timeFormated(file.lastCommitUpdate)}}
-      </span>
-    </td>
-  </template>
-</tr>
+      <td class="hidden-xs text-right">
+        <span :title="tooltipTitle(file.lastCommit.updatedAt)">
+          {{ timeFormated(file.lastCommit.updatedAt) }}
+        </span>
+      </td>
+    </template>
+  </tr>
 </template>
diff --git a/app/assets/javascripts/repo/components/repo_file_options.vue b/app/assets/javascripts/repo/components/repo_file_options.vue
deleted file mode 100644
index 6a15755f029..00000000000
--- a/app/assets/javascripts/repo/components/repo_file_options.vue
+++ /dev/null
@@ -1,25 +0,0 @@
-<script>
-const RepoFileOptions = {
-  props: {
-    isMini: {
-      type: Boolean,
-      required: false,
-      default: false,
-    },
-    projectName: {
-      type: String,
-      required: true,
-    },
-  },
-};
-
-export default RepoFileOptions;
-</script>
-
-<template>
-  <tr v-if="isMini" class="repo-file-options">
-    <td>
-      <span class="title">{{projectName}}</span>
-    </td>
-  </tr>
-</template>
diff --git a/app/assets/javascripts/repo/components/repo_loading_file.vue b/app/assets/javascripts/repo/components/repo_loading_file.vue
index bc8c64c8362..fb82fb260b6 100644
--- a/app/assets/javascripts/repo/components/repo_loading_file.vue
+++ b/app/assets/javascripts/repo/components/repo_loading_file.vue
@@ -1,42 +1,20 @@
 <script>
-const RepoLoadingFile = {
-  props: {
-    loading: {
-      type: Object,
-      required: false,
-      default: {},
-    },
-    hasFiles: {
-      type: Boolean,
-      required: false,
-      default: false,
-    },
-    isMini: {
-      type: Boolean,
-      required: false,
-      default: false,
-    },
-  },
+  import repoMixin from '../mixins/repo_mixin';
 
-  computed: {
-    showGhostLines() {
-      return this.loading.tree && !this.hasFiles;
+  export default {
+    mixins: [
+      repoMixin,
+    ],
+    methods: {
+      lineOfCode(n) {
+        return `skeleton-line-${n}`;
+      },
     },
-  },
-
-  methods: {
-    lineOfCode(n) {
-      return `skeleton-line-${n}`;
-    },
-  },
-};
-
-export default RepoLoadingFile;
+  };
 </script>
 
 <template>
   <tr
-    v-if="showGhostLines"
     class="loading-file">
     <td>
       <div
@@ -64,7 +42,7 @@ export default RepoLoadingFile;
     <td
       v-if="!isMini"
       class="hidden-xs">
-      <div class="animation-container animation-container-small">
+      <div class="animation-container animation-container-small animation-container-right">
         <div
           v-for="n in 6"
           :key="n"
diff --git a/app/assets/javascripts/repo/components/repo_prev_directory.vue b/app/assets/javascripts/repo/components/repo_prev_directory.vue
index bbdbdc61e38..d042fc664b6 100644
--- a/app/assets/javascripts/repo/components/repo_prev_directory.vue
+++ b/app/assets/javascripts/repo/components/repo_prev_directory.vue
@@ -1,38 +1,34 @@
 <script>
-import RepoMixin from '../mixins/repo_mixin';
+  import eventHub from '../event_hub';
 
-const RepoPreviousDirectory = {
-  props: {
-    prevUrl: {
-      type: String,
-      required: true,
+  export default {
+    props: {
+      prevUrl: {
+        type: String,
+        required: true,
+      },
     },
-  },
-
-  mixins: [RepoMixin],
-
-  computed: {
-    colSpanCondition() {
-      return this.isMini ? undefined : 3;
+    computed: {
+      colSpanCondition() {
+        return this.isMini ? undefined : 3;
+      },
     },
-  },
-
-  methods: {
-    linkClicked(file) {
-      this.$emit('linkclicked', file);
+    methods: {
+      linkClicked(file) {
+        eventHub.$emit('goToPreviousDirectoryClicked', file);
+      },
     },
-  },
-};
-
-export default RepoPreviousDirectory;
+  };
 </script>
 
 <template>
-<tr class="prev-directory">
-  <td
-    :colspan="colSpanCondition"
-    @click.prevent="linkClicked(prevUrl)">
-    <a :href="prevUrl">..</a>
-  </td>
-</tr>
+  <tr class="prev-directory">
+    <td
+      :colspan="colSpanCondition"
+      class="table-cell"
+      @click.prevent="linkClicked(prevUrl)"
+    >
+      <a :href="prevUrl">...</a>
+    </td>
+  </tr>
 </template>
diff --git a/app/assets/javascripts/repo/components/repo_sidebar.vue b/app/assets/javascripts/repo/components/repo_sidebar.vue
index e0f3c33003a..a8eb92b0186 100644
--- a/app/assets/javascripts/repo/components/repo_sidebar.vue
+++ b/app/assets/javascripts/repo/components/repo_sidebar.vue
@@ -2,8 +2,8 @@
 import Service from '../services/repo_service';
 import Helper from '../helpers/repo_helper';
 import Store from '../stores/repo_store';
+import eventHub from '../event_hub';
 import RepoPreviousDirectory from './repo_prev_directory.vue';
-import RepoFileOptions from './repo_file_options.vue';
 import RepoFile from './repo_file.vue';
 import RepoLoadingFile from './repo_loading_file.vue';
 import RepoMixin from '../mixins/repo_mixin';
@@ -11,21 +11,39 @@ import RepoMixin from '../mixins/repo_mixin';
 export default {
   mixins: [RepoMixin],
   components: {
-    'repo-file-options': RepoFileOptions,
     'repo-previous-directory': RepoPreviousDirectory,
     'repo-file': RepoFile,
     'repo-loading-file': RepoLoadingFile,
   },
-
   created() {
     window.addEventListener('popstate', this.checkHistory);
   },
   destroyed() {
+    eventHub.$off('linkclicked', this.fileClicked);
+    eventHub.$off('goToPreviousDirectoryClicked', this.goToPreviousDirectoryClicked);
     window.removeEventListener('popstate', this.checkHistory);
   },
-
+  mounted() {
+    eventHub.$on('linkclicked', this.fileClicked);
+    eventHub.$on('goToPreviousDirectoryClicked', this.goToPreviousDirectoryClicked);
+  },
   data: () => Store,
+  computed: {
+    flattendFiles() {
+      const map = (arr) => {
+        if (arr && arr.tree.length === 0) {
+          return [];
+        }
+
+        return _.map(arr.tree, a => [a, map(a)]);
+      };
 
+      return _.chain(this.files)
+        .map(arr => [arr, map(arr)])
+        .flatten()
+        .value();
+    },
+  },
   methods: {
     checkHistory() {
       let selectedFile = this.files.find(file => location.pathname.indexOf(file.url) > -1);
@@ -52,16 +70,17 @@ export default {
     },
 
     fileClicked(clickedFile, lineNumber) {
-      let file = clickedFile;
+      const file = clickedFile;
+
       if (file.loading) return;
-      file.loading = true;
 
       if (file.type === 'tree' && file.opened) {
-        file = Store.removeChildFilesOfTree(file);
-        file.loading = false;
+        Helper.setDirectoryToClosed(file);
         Store.setActiveLine(lineNumber);
       } else {
         const openFile = Helper.getFileFromPath(file.url);
+        file.loading = true;
+
         if (openFile) {
           file.loading = false;
           Store.setActiveFiles(openFile);
@@ -92,38 +111,43 @@ export default {
 <template>
 <div id="sidebar" :class="{'sidebar-mini' : isMini}">
   <table class="table">
-    <thead v-if="!isMini">
+    <thead>
       <tr>
-        <th class="name">Name</th>
-        <th class="hidden-sm hidden-xs last-commit">Last commit</th>
-        <th class="hidden-xs last-update text-right">Last update</th>
+        <th
+          v-if="isMini"
+          class="repo-file-options title"
+        >
+          <strong class="clgray">
+            {{ projectName }}
+          </strong>
+        </th>
+        <template v-else>
+          <th class="name">
+            Name
+          </th>
+          <th class="hidden-sm hidden-xs last-commit">
+            Last commit
+          </th>
+          <th class="hidden-xs last-update text-right">
+            Last update
+          </th>
+        </template>
       </tr>
     </thead>
     <tbody>
-      <repo-file-options
-        :is-mini="isMini"
-        :project-name="projectName"
-      />
       <repo-previous-directory
-        v-if="isRoot"
+        v-if="!isRoot"
         :prev-url="prevURL"
-        @linkclicked="goToPreviousDirectoryClicked(prevURL)"/>
+      />
       <repo-loading-file
+        v-if="!flattendFiles.length && loading.tree"
         v-for="n in 5"
         :key="n"
-        :loading="loading"
-        :has-files="!!files.length"
-        :is-mini="isMini"
       />
       <repo-file
-        v-for="file in files"
+        v-for="file in flattendFiles"
         :key="file.id"
         :file="file"
-        :is-mini="isMini"
-        @linkclicked="fileClicked(file)"
-        :is-tree="isTree"
-        :has-files="!!files.length"
-        :active-file="activeFile"
       />
     </tbody>
   </table>
diff --git a/app/assets/javascripts/repo/components/repo_tab.vue b/app/assets/javascripts/repo/components/repo_tab.vue
index 0d0c34ec741..098715915b0 100644
--- a/app/assets/javascripts/repo/components/repo_tab.vue
+++ b/app/assets/javascripts/repo/components/repo_tab.vue
@@ -26,11 +26,13 @@ const RepoTab = {
   },
 
   methods: {
-    tabClicked: Store.setActiveFiles,
-
+    tabClicked(file) {
+      Store.setActiveFiles(file);
+    },
     closeTab(file) {
       if (file.changed) return;
-      this.$emit('tabclosed', file);
+
+      Store.removeFromOpenedFiles(file);
     },
   },
 };
@@ -39,25 +41,28 @@ export default RepoTab;
 </script>
 
 <template>
-<li @click="tabClicked(tab)">
-  <a
-    href="#0"
-    class="close"
-    @click.stop.prevent="closeTab(tab)"
-    :aria-label="closeLabel">
-    <i
-      class="fa"
-      :class="changedClass"
-      aria-hidden="true">
-    </i>
-  </a>
+  <li
+    :class="{ active : tab.active }"
+    @click="tabClicked(tab)"
+  >
+    <button
+      type="button"
+      class="close-btn"
+      @click.stop.prevent="closeTab(tab)"
+      :aria-label="closeLabel">
+      <i
+        class="fa"
+        :class="changedClass"
+        aria-hidden="true">
+      </i>
+    </button>
 
-  <a
-    href="#"
-    class="repo-tab"
-    :title="tab.url"
-    @click.prevent="tabClicked(tab)">
-    {{tab.name}}
-  </a>
-</li>
+    <a
+      href="#"
+      class="repo-tab"
+      :title="tab.url"
+      @click.prevent="tabClicked(tab)">
+      {{tab.name}}
+    </a>
+  </li>
 </template>
diff --git a/app/assets/javascripts/repo/components/repo_tabs.vue b/app/assets/javascripts/repo/components/repo_tabs.vue
index 9c5bfc5d0cf..2759335cc67 100644
--- a/app/assets/javascripts/repo/components/repo_tabs.vue
+++ b/app/assets/javascripts/repo/components/repo_tabs.vue
@@ -1,36 +1,27 @@
 <script>
-import Store from '../stores/repo_store';
-import RepoTab from './repo_tab.vue';
-import RepoMixin from '../mixins/repo_mixin';
+  import Store from '../stores/repo_store';
+  import RepoTab from './repo_tab.vue';
+  import RepoMixin from '../mixins/repo_mixin';
 
-const RepoTabs = {
-  mixins: [RepoMixin],
-
-  components: {
-    'repo-tab': RepoTab,
-  },
-
-  data: () => Store,
-
-  methods: {
-    tabClosed(file) {
-      Store.removeFromOpenedFiles(file);
+  export default {
+    mixins: [RepoMixin],
+    components: {
+      'repo-tab': RepoTab,
     },
-  },
-};
-
-export default RepoTabs;
+    data: () => Store,
+  };
 </script>
 
 <template>
-<ul id="tabs">
-  <repo-tab
-    v-for="tab in openedFiles"
-    :key="tab.id"
-    :tab="tab"
-    :class="{'active' : tab.active}"
-    @tabclosed="tabClosed"
-  />
-  <li class="tabs-divider" />
-</ul>
+  <ul
+    id="tabs"
+    class="list-unstyled"
+  >
+    <repo-tab
+      v-for="tab in openedFiles"
+      :key="tab.id"
+      :tab="tab"
+    />
+    <li class="tabs-divider" />
+  </ul>
 </template>
diff --git a/app/assets/javascripts/repo/event_hub.js b/app/assets/javascripts/repo/event_hub.js
new file mode 100644
index 00000000000..0948c2e5352
--- /dev/null
+++ b/app/assets/javascripts/repo/event_hub.js
@@ -0,0 +1,3 @@
+import Vue from 'vue';
+
+export default new Vue();
diff --git a/app/assets/javascripts/repo/helpers/repo_helper.js b/app/assets/javascripts/repo/helpers/repo_helper.js
index 46204598e1d..9d05db0e414 100644
--- a/app/assets/javascripts/repo/helpers/repo_helper.js
+++ b/app/assets/javascripts/repo/helpers/repo_helper.js
@@ -1,3 +1,4 @@
+import { convertPermissionToBoolean } from '../../lib/utils/common_utils';
 import Service from '../services/repo_service';
 import Store from '../stores/repo_store';
 import Flash from '../../flash';
@@ -25,10 +26,6 @@ const RepoHelper = {
 
   key: '',
 
-  isTree(data) {
-    return Object.hasOwnProperty.call(data, 'blobs');
-  },
-
   Time: window.performance
   && window.performance.now
   ? window.performance
@@ -59,12 +56,17 @@ const RepoHelper = {
 
   setDirectoryOpen(tree, title) {
     const file = tree;
-    if (!file) return undefined;
+    if (!file) return;
 
     file.opened = true;
-    file.icon = 'fa-folder-open';
     RepoHelper.updateHistoryEntry(file.url, title);
-    return file;
+  },
+
+  setDirectoryToClosed(entry) {
+    const dir = entry;
+
+    dir.opened = false;
+    dir.tree = [];
   },
 
   isRenderable() {
@@ -81,63 +83,20 @@ const RepoHelper = {
     .catch(RepoHelper.loadingError);
   },
 
-  // when you open a directory you need to put the directory files under
-  // the directory... This will merge the list of the current directory and the new list.
-  getNewMergedList(inDirectory, currentList, newList) {
-    const newListSorted = newList.sort(this.compareFilesCaseInsensitive);
-    if (!inDirectory) return newListSorted;
-    const indexOfFile = currentList.findIndex(file => file.url === inDirectory.url);
-    if (!indexOfFile) return newListSorted;
-    return RepoHelper.mergeNewListToOldList(newListSorted, currentList, inDirectory, indexOfFile);
-  },
-
-  // within the get new merged list this does the merging of the current list of files
-  // and the new list of files. The files are never "in" another directory they just
-  // appear like they are because of the margin.
-  mergeNewListToOldList(newList, oldList, inDirectory, indexOfFile) {
-    newList.reverse().forEach((newFile) => {
-      const fileIndex = indexOfFile + 1;
-      const file = newFile;
-      file.level = inDirectory.level + 1;
-      oldList.splice(fileIndex, 0, file);
-    });
-
-    return oldList;
-  },
-
-  compareFilesCaseInsensitive(a, b) {
-    const aName = a.name.toLowerCase();
-    const bName = b.name.toLowerCase();
-    if (a.level > 0) return 0;
-    if (aName < bName) { return -1; }
-    if (aName > bName) { return 1; }
-    return 0;
-  },
-
-  isRoot(url) {
-    // the url we are requesting -> split by the project URL. Grab the right side.
-    const isRoot = !!url.split(Store.projectUrl)[1]
-    // remove the first "/"
-    .slice(1)
-    // split this by "/"
-    .split('/')
-    // remove the first two items of the array... usually /tree/master.
-    .slice(2)
-    // we want to know the length of the array.
-    // If greater than 0 not root.
-    .length;
-    return isRoot;
-  },
-
   getContent(treeOrFile) {
     let file = treeOrFile;
+
+    if (!Store.files.length) {
+      Store.loading.tree = true;
+    }
+
     return Service.getContent()
     .then((response) => {
       const data = response.data;
       if (response.headers && response.headers['page-title']) data.pageTitle = response.headers['page-title'];
+      if (response.headers && response.headers['is-root']) Store.isRoot = convertPermissionToBoolean(response.headers['is-root']);
 
-      Store.isTree = RepoHelper.isTree(data);
-      if (!Store.isTree) {
+      if (file && file.type === 'blob') {
         if (!file) file = data;
         Store.binary = data.binary;
 
@@ -145,33 +104,28 @@ const RepoHelper = {
           // file might be undefined
           RepoHelper.setBinaryDataAsBase64(data);
           Store.setViewToPreview();
-        } else if (!Store.isPreviewView()) {
-          if (!data.render_error) {
-            Service.getRaw(data.raw_path)
-            .then((rawResponse) => {
-              Store.blobRaw = rawResponse.data;
-              data.plain = rawResponse.data;
-              RepoHelper.setFile(data, file);
-            }).catch(RepoHelper.loadingError);
-          }
+        } else if (!Store.isPreviewView() && !data.render_error) {
+          Service.getRaw(data.raw_path)
+          .then((rawResponse) => {
+            Store.blobRaw = rawResponse.data;
+            data.plain = rawResponse.data;
+            RepoHelper.setFile(data, file);
+          }).catch(RepoHelper.loadingError);
         }
 
         if (Store.isPreviewView()) {
           RepoHelper.setFile(data, file);
         }
+      } else {
+        Store.loading.tree = false;
+        RepoHelper.setDirectoryOpen(file, data.pageTitle || data.name);
 
-        // if the file tree is empty
-        if (Store.files.length === 0) {
-          const parentURL = Service.blobURLtoParentTree(Service.url);
-          Service.url = parentURL;
-          RepoHelper.getContent();
+        if (!file) {
+          Store.files = this.dataToListOfFiles(data);
+        } else {
+          file.tree = this.dataToListOfFiles(data, file.level + 1);
         }
-      } else {
-        // it's a tree
-        if (!file) Store.isRoot = RepoHelper.isRoot(Service.url);
-        file = RepoHelper.setDirectoryOpen(file, data.pageTitle || data.name);
-        const newDirectory = RepoHelper.dataToListOfFiles(data);
-        Store.addFilesToDirectory(file, Store.files, newDirectory);
+
         Store.prevURL = Service.blobURLtoParentTree(Service.url);
       }
     }).catch(RepoHelper.loadingError);
@@ -190,57 +144,57 @@ const RepoHelper = {
     Store.setActiveFiles(newFile);
   },
 
-  serializeBlob(blob) {
-    const simpleBlob = RepoHelper.serializeRepoEntity('blob', blob);
-    simpleBlob.lastCommitMessage = blob.last_commit.message;
-    simpleBlob.lastCommitUpdate = blob.last_commit.committed_date;
-    simpleBlob.loading = false;
-
-    return simpleBlob;
+  serializeBlob(blob, level) {
+    return RepoHelper.serializeRepoEntity('blob', blob, level);
   },
 
-  serializeTree(tree) {
-    return RepoHelper.serializeRepoEntity('tree', tree);
+  serializeTree(tree, level) {
+    return RepoHelper.serializeRepoEntity('tree', tree, level);
   },
 
-  serializeSubmodule(submodule) {
-    return RepoHelper.serializeRepoEntity('submodule', submodule);
+  serializeSubmodule(submodule, level) {
+    return RepoHelper.serializeRepoEntity('submodule', submodule, level);
   },
 
-  serializeRepoEntity(type, entity) {
+  serializeRepoEntity(type, entity, level = 0) {
     const { url, name, icon, last_commit } = entity;
     const returnObj = {
       type,
       name,
       url,
+      level,
       icon: `fa-${icon}`,
-      level: 0,
+      tree: [],
       loading: false,
+      opened: false,
     };
 
-    if (entity.last_commit) {
-      returnObj.lastCommitUrl = `${Store.projectUrl}/commit/${last_commit.id}`;
+    // eslint-disable-next-line camelcase
+    if (last_commit) {
+      returnObj.lastCommit = {
+        url: `${Store.projectUrl}/commit/${last_commit.id}`,
+        message: last_commit.message,
+        updatedAt: last_commit.committed_date,
+      };
     } else {
-      returnObj.lastCommitUrl = '';
+      returnObj.lastCommit = {};
     }
+
     return returnObj;
   },
 
   scrollTabsRight() {
-    // wait for the transition. 0.1 seconds.
-    setTimeout(() => {
-      const tabs = document.getElementById('tabs');
-      if (!tabs) return;
-      tabs.scrollLeft = tabs.scrollWidth;
-    }, 200);
+    const tabs = document.getElementById('tabs');
+    if (!tabs) return;
+    tabs.scrollLeft = tabs.scrollWidth;
   },
 
-  dataToListOfFiles(data) {
+  dataToListOfFiles(data, level) {
     const { blobs, trees, submodules } = data;
     return [
-      ...blobs.map(blob => RepoHelper.serializeBlob(blob)),
-      ...trees.map(tree => RepoHelper.serializeTree(tree)),
-      ...submodules.map(submodule => RepoHelper.serializeSubmodule(submodule)),
+      ...trees.map(tree => RepoHelper.serializeTree(tree, level)),
+      ...blobs.map(blob => RepoHelper.serializeBlob(blob, level)),
+      ...submodules.map(submodule => RepoHelper.serializeSubmodule(submodule, level)),
     ];
   },
 
diff --git a/app/assets/javascripts/repo/index.js b/app/assets/javascripts/repo/index.js
index 1a09f411b22..f0a059d7ae3 100644
--- a/app/assets/javascripts/repo/index.js
+++ b/app/assets/javascripts/repo/index.js
@@ -1,5 +1,6 @@
 import $ from 'jquery';
 import Vue from 'vue';
+import { convertPermissionToBoolean } from '../lib/utils/common_utils';
 import Service from './services/repo_service';
 import Store from './stores/repo_store';
 import Repo from './components/repo.vue';
@@ -33,6 +34,7 @@ function setInitialStore(data) {
   Store.onTopOfBranch = data.onTopOfBranch;
   Store.newMrTemplateUrl = decodeURIComponent(data.newMrTemplateUrl);
   Store.customBranchURL = decodeURIComponent(data.blobUrl);
+  Store.isRoot = convertPermissionToBoolean(data.root);
   Store.currentBranch = $('button.dropdown-menu-toggle').attr('data-ref');
   Store.checkIsCommitable();
   Store.setBranchHash();
diff --git a/app/assets/javascripts/repo/stores/repo_store.js b/app/assets/javascripts/repo/stores/repo_store.js
index f8d29af7ffe..2950e5702d6 100644
--- a/app/assets/javascripts/repo/stores/repo_store.js
+++ b/app/assets/javascripts/repo/stores/repo_store.js
@@ -8,7 +8,6 @@ const RepoStore = {
   canCommit: false,
   onTopOfBranch: false,
   editMode: false,
-  isTree: false,
   isRoot: false,
   prevURL: '',
   projectId: '',
@@ -72,10 +71,6 @@ const RepoStore = {
     RepoStore.isCommitable = RepoStore.onTopOfBranch && RepoStore.canCommit;
   },
 
-  addFilesToDirectory(inDirectory, currentList, newList) {
-    RepoStore.files = Helper.getNewMergedList(inDirectory, currentList, newList);
-  },
-
   toggleRawPreview() {
     RepoStore.activeFile.raw = !RepoStore.activeFile.raw;
     RepoStore.activeFileLabel = RepoStore.activeFile.raw ? 'Display rendered file' : 'Display source';
@@ -129,30 +124,6 @@ const RepoStore = {
     RepoStore.activeFileLabel = 'Display source';
   },
 
-  removeChildFilesOfTree(tree) {
-    let foundTree = false;
-    const treeToClose = tree;
-    let canStopSearching = false;
-    RepoStore.files = RepoStore.files.filter((file) => {
-      const isItTheTreeWeWant = file.url === treeToClose.url;
-      // if it's the next tree
-      if (foundTree && file.type === 'tree' && !isItTheTreeWeWant && file.level === treeToClose.level) {
-        canStopSearching = true;
-        return true;
-      }
-      if (canStopSearching) return true;
-
-      if (isItTheTreeWeWant) foundTree = true;
-
-      if (foundTree) return file.level <= treeToClose.level;
-      return true;
-    });
-
-    treeToClose.opened = false;
-    treeToClose.icon = 'fa-folder';
-    return treeToClose;
-  },
-
   removeFromOpenedFiles(file) {
     if (file.type === 'tree') return;
     let foundIndex;
@@ -186,6 +157,7 @@ const RepoStore = {
     if (openedFilesAlreadyExists) return;
 
     openFile.changed = false;
+    openFile.active = true;
     RepoStore.openedFiles.push(openFile);
   },
 
diff --git a/app/assets/stylesheets/framework/animations.scss b/app/assets/stylesheets/framework/animations.scss
index f0e6b23757f..374988bb590 100644
--- a/app/assets/stylesheets/framework/animations.scss
+++ b/app/assets/stylesheets/framework/animations.scss
@@ -198,6 +198,13 @@ a {
     height: 12px;
   }
 
+  &.animation-container-right {
+    .skeleton-line-2 {
+      left: 0;
+      right: 150px;
+    }
+  }
+
   &::before {
     animation-duration: 1s;
     animation-fill-mode: forwards;
diff --git a/app/assets/stylesheets/pages/repo.scss b/app/assets/stylesheets/pages/repo.scss
index c36fe25f74d..ea37ccf5e3d 100644
--- a/app/assets/stylesheets/pages/repo.scss
+++ b/app/assets/stylesheets/pages/repo.scss
@@ -153,28 +153,13 @@
       overflow-x: auto;
 
       li {
-        animation: swipeRightAppear ease-in 0.1s;
-        animation-iteration-count: 1;
-        transform-origin: 0% 50%;
-        list-style-type: none;
+        position: relative;
         background: $gray-normal;
-        display: inline-block;
         padding: #{$gl-padding / 2} $gl-padding;
         border-right: 1px solid $white-dark;
         border-bottom: 1px solid $white-dark;
-        white-space: nowrap;
         cursor: pointer;
 
-        &.remove {
-          animation: swipeRightDissapear ease-in 0.1s;
-          animation-iteration-count: 1;
-          transform-origin: 0% 50%;
-
-          a {
-            width: 0;
-          }
-        }
-
         &.active {
           background: $white-light;
           border-bottom: none;
@@ -182,17 +167,21 @@
 
         a {
           @include str-truncated(100px);
-          color: $black;
+          color: $gl-text-color;
           vertical-align: middle;
           text-decoration: none;
           margin-right: 12px;
+        }
 
-          &.close {
-            width: auto;
-            font-size: 15px;
-            opacity: 1;
-            margin-right: -6px;
-          }
+        .close-btn {
+          position: absolute;
+          right: 8px;
+          top: 50%;
+          padding: 0;
+          background: none;
+          border: 0;
+          font-size: $gl-font-size;
+          transform: translateY(-50%);
         }
 
         .close-icon:hover {
@@ -201,9 +190,6 @@
 
         .close-icon,
         .unsaved-icon {
-          float: right;
-          margin-top: 3px;
-          margin-left: 15px;
           color: $gray-darkest;
         }
 
@@ -222,9 +208,7 @@
 
     #repo-file-buttons {
       background-color: $white-light;
-      border-bottom: 1px solid $white-normal;
       padding: 5px 10px;
-      position: relative;
       border-top: 1px solid $white-normal;
     }
 
@@ -287,37 +271,23 @@
       overflow: auto;
     }
 
-    table {
+    .table {
       margin-bottom: 0;
     }
 
     tr {
-      animation: fadein 0.5s;
-      cursor: pointer;
-
-      &.repo-file-options td {
-        padding: 0;
-        border-top: none;
-        background: $gray-light;
+      .repo-file-options {
+        padding: 2px 16px;
         width: 100%;
-        display: inline-block;
-
-        &:first-child {
-          border-top-left-radius: 2px;
-        }
+      }
 
-        .title {
-          display: inline-block;
-          font-size: 10px;
-          text-transform: uppercase;
-          font-weight: $gl-font-weight-bold;
-          color: $gray-darkest;
-          white-space: nowrap;
-          overflow: hidden;
-          text-overflow: ellipsis;
-          vertical-align: middle;
-          padding: 2px 16px;
-        }
+      .title {
+        font-size: 10px;
+        text-transform: uppercase;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        vertical-align: middle;
       }
 
       .file-icon {
@@ -329,11 +299,13 @@
       }
     }
 
+    .file {
+      cursor: pointer;
+    }
+
     a {
       @include str-truncated(250px);
       color: $almost-black;
-      display: inline-block;
-      vertical-align: middle;
     }
   }
 }
diff --git a/app/controllers/projects/tree_controller.rb b/app/controllers/projects/tree_controller.rb
index f3719059f88..d3de3509988 100644
--- a/app/controllers/projects/tree_controller.rb
+++ b/app/controllers/projects/tree_controller.rb
@@ -36,6 +36,7 @@ class Projects::TreeController < Projects::ApplicationController
 
       format.json do
         page_title @path.presence || _("Files"), @ref, @project.name_with_namespace
+        response.header['Is-Root'] = @path.empty?
 
         # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/38261
         Gitlab::GitalyClient.allow_n_plus_1_calls do
diff --git a/app/views/shared/repo/_repo.html.haml b/app/views/shared/repo/_repo.html.haml
index 919f19f2c23..7185f5bcc5b 100644
--- a/app/views/shared/repo/_repo.html.haml
+++ b/app/views/shared/repo/_repo.html.haml
@@ -1,4 +1,5 @@
-#repo{ data: { url: content_url,
+#repo{ data: { root: @path.empty?.to_s,
+               url: content_url,
                project_name: project.name,
                refs_url: refs_project_path(project, format: :json),
                project_url: project_path(project),
diff --git a/spec/javascripts/repo/components/repo_file_options_spec.js b/spec/javascripts/repo/components/repo_file_options_spec.js
deleted file mode 100644
index 9759b4bf12d..00000000000
--- a/spec/javascripts/repo/components/repo_file_options_spec.js
+++ /dev/null
@@ -1,33 +0,0 @@
-import Vue from 'vue';
-import repoFileOptions from '~/repo/components/repo_file_options.vue';
-
-describe('RepoFileOptions', () => {
-  const projectName = 'projectName';
-
-  function createComponent(propsData) {
-    const RepoFileOptions = Vue.extend(repoFileOptions);
-
-    return new RepoFileOptions({
-      propsData,
-    }).$mount();
-  }
-
-  it('renders the title and new file/folder buttons if isMini is true', () => {
-    const vm = createComponent({
-      isMini: true,
-      projectName,
-    });
-
-    expect(vm.$el.classList.contains('repo-file-options')).toBeTruthy();
-    expect(vm.$el.querySelector('.title').textContent).toEqual(projectName);
-  });
-
-  it('does not render if isMini is false', () => {
-    const vm = createComponent({
-      isMini: false,
-      projectName,
-    });
-
-    expect(vm.$el.innerHTML).toBeFalsy();
-  });
-});