Added file tree to merge request diffs

This file tree displays all the diff files in a tree like format
Each file is taken and converted into a tree with folders
Each folder can be toggled open & closed
Clicking a file will scroll to the diff file & highlight with a glow affect

Searching the tree list will search only files & return a list of the
files without any folders

Each file row contains an icon to show changed, new file or deleted
Each row will also contain the added & removed lines count

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14249

app/assets/javascripts/diffs/components/app.vue

@@ -5,22 +5,22 @@ import { __ } from '~/locale';
 import createFlash from '~/flash';
 import eventHub from '../../notes/event_hub';
 import CompareVersions from './compare_versions.vue';
-import ChangedFiles from './changed_files.vue';
 import DiffFile from './diff_file.vue';
 import NoChanges from './no_changes.vue';
 import HiddenFilesWarning from './hidden_files_warning.vue';
 import CommitWidget from './commit_widget.vue';
+import TreeList from './tree_list.vue';
 export default {
   name: 'DiffsApp',
   components: {
     Icon,
     CompareVersions,
-    ChangedFiles,
     DiffFile,
     NoChanges,
     HiddenFilesWarning,
     CommitWidget,
+    TreeList,
   },
   props: {
     endpoint: {
@@ -58,6 +58,7 @@ export default {
       plainDiffPath: state => state.diffs.plainDiffPath,
       emailPatchPath: state => state.diffs.emailPatchPath,
     }),
+    ...mapState('diffs', ['showTreeList']),
     ...mapGetters('diffs', ['isParallelView']),
     ...mapGetters(['isNotesFetched', 'discussionsStructuredByLineCode']),
     targetBranch() {
@@ -88,6 +89,9 @@ export default {
     canCurrentUserFork() {
       return this.currentUser.canFork === true && this.currentUser.canCreateMergeRequest;
     },
+    showCompareVersions() {
+      return this.mergeRequestDiffs && this.mergeRequestDiff;
+    },
   },
   watch: {
     diffViewType() {
@@ -102,6 +106,8 @@ export default {
       this.adjustView();
     },
+    isLoading: 'adjustView',
+    showTreeList: 'adjustView',
   },
   mounted() {
     this.setBaseConfig({ endpoint: this.endpoint, projectPath: this.projectPath });
@@ -152,10 +158,11 @@ export default {
       }
     },
     adjustView() {
-      if (this.shouldShow && this.isParallelView) {
-        window.mrTabs.expandViewContainer();
-      } else {
-        window.mrTabs.resetViewContainer();
+      if (this.shouldShow) {
+        this.$nextTick(() => {
+          window.mrTabs.resetViewContainer();
+          window.mrTabs.expandViewContainer(this.showTreeList);
+        });
       }
     },
   },
@@ -177,7 +184,7 @@ export default {
       class="diffs tab-pane"
     >
       <compare-versions
-        v-if="!commit && mergeRequestDiffs.length > 1"
+        v-if="showCompareVersions"
         :merge-request-diffs="mergeRequestDiffs"
         :merge-request-diff="mergeRequestDiff"
         :start-version="startVersion"
@@ -215,22 +222,26 @@ export default {
         :commit="commit"
       />
-      <changed-files
-        :diff-files="diffFiles"
-      />
-
-      <div
-        v-if="diffFiles.length > 0"
-        class="files"
-      >
-        <diff-file
-          v-for="file in diffFiles"
-          :key="file.newPath"
-          :file="file"
-          :can-current-user-fork="canCurrentUserFork"
-        />
+      <div class="files d-flex prepend-top-default">
+        <div
+          v-show="showTreeList"
+          class="diff-tree-list"
+        >
+          <tree-list />
+        </div>
+        <div
+          v-if="diffFiles.length > 0"
+          class="diff-files-holder"
+        >
+          <diff-file
+            v-for="file in diffFiles"
+            :key="file.newPath"
+            :file="file"
+            :can-current-user-fork="canCurrentUserFork"
+          />
+        </div>
+        <no-changes v-else />
       </div>
-      <no-changes v-else />
     </div>
   </div>
 </template>

app/assets/javascripts/diffs/components/changed_files.vue

-<script>
-import { mapGetters, mapActions } from 'vuex';
-import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
-import Icon from '~/vue_shared/components/icon.vue';
-import { pluralize } from '~/lib/utils/text_utility';
-import { getParameterValues, mergeUrlParams } from '~/lib/utils/url_utility';
-import { contentTop } from '~/lib/utils/common_utils';
-import { __ } from '~/locale';
-import ChangedFilesDropdown from './changed_files_dropdown.vue';
-import changedFilesMixin from '../mixins/changed_files';
-
-export default {
-  components: {
-    Icon,
-    ChangedFilesDropdown,
-    ClipboardButton,
-  },
-  mixins: [changedFilesMixin],
-  data() {
-    return {
-      isStuck: false,
-      maxWidth: 'auto',
-      offsetTop: 0,
-    };
-  },
-  computed: {
-    ...mapGetters('diffs', ['isInlineView', 'isParallelView', 'areAllFilesCollapsed']),
-    sumAddedLines() {
-      return this.sumValues('addedLines');
-    },
-    sumRemovedLines() {
-      return this.sumValues('removedLines');
-    },
-    whitespaceVisible() {
-      return !getParameterValues('w')[0];
-    },
-    toggleWhitespaceText() {
-      if (this.whitespaceVisible) {
-        return __('Hide whitespace changes');
-      }
-      return __('Show whitespace changes');
-    },
-    toggleWhitespacePath() {
-      if (this.whitespaceVisible) {
-        return mergeUrlParams({ w: 1 }, window.location.href);
-      }
-
-      return mergeUrlParams({ w: 0 }, window.location.href);
-    },
-    top() {
-      return `${this.offsetTop}px`;
-    },
-  },
-  created() {
-    document.addEventListener('scroll', this.handleScroll);
-    this.offsetTop = contentTop();
-  },
-  beforeDestroy() {
-    document.removeEventListener('scroll', this.handleScroll);
-  },
-  methods: {
-    ...mapActions('diffs', ['setInlineDiffViewType', 'setParallelDiffViewType', 'expandAllFiles']),
-    pluralize,
-    handleScroll() {
-      if (!this.updating) {
-        this.$nextTick(this.updateIsStuck);
-        this.updating = true;
-      }
-    },
-    updateIsStuck() {
-      if (!this.$refs.wrapper) {
-        return;
-      }
-
-      const scrollPosition = window.scrollY;
-
-      this.isStuck = scrollPosition + this.offsetTop >= this.$refs.placeholder.offsetTop;
-      this.updating = false;
-    },
-    sumValues(key) {
-      return this.diffFiles.reduce((total, file) => total + file[key], 0);
-    },
-  },
-};
-</script>
-
-<template>
-  <span>
-    <div ref="placeholder"></div>
-    <div
-      ref="wrapper"
-      :style="{ top }"
-      :class="{'is-stuck': isStuck}"
-      class="content-block oneline-block diff-files-changed diff-files-changed-merge-request
-      files-changed js-diff-files-changed"
-    >
-      <div class="files-changed-inner">
-        <div
-          class="inline-parallel-buttons d-none d-md-block"
-        >
-          <a
-            v-if="areAllFilesCollapsed"
-            class="btn btn-default"
-            @click="expandAllFiles"
-          >
-            {{ __('Expand all') }}
-          </a>
-          <a
-            :href="toggleWhitespacePath"
-            class="btn btn-default"
-          >
-            {{ toggleWhitespaceText }}
-          </a>
-          <div class="btn-group">
-            <button
-              id="inline-diff-btn"
-              :class="{ active: isInlineView }"
-              type="button"
-              class="btn js-inline-diff-button"
-              data-view-type="inline"
-              @click="setInlineDiffViewType"
-            >
-              {{ __('Inline') }}
-            </button>
-            <button
-              id="parallel-diff-btn"
-              :class="{ active: isParallelView }"
-              type="button"
-              class="btn js-parallel-diff-button"
-              data-view-type="parallel"
-              @click="setParallelDiffViewType"
-            >
-              {{ __('Side-by-side') }}
-            </button>
-          </div>
-        </div>
-
-        <div class="commit-stat-summary dropdown">
-          <changed-files-dropdown
-            :diff-files="diffFiles"
-          />
-
-          <span
-            class="js-diff-stats-additions-deletions-expanded
-            diff-stats-additions-deletions-expanded"
-          >
-            with
-            <strong class="cgreen">
-              {{ pluralize(`${sumAddedLines} addition`, sumAddedLines) }}
-            </strong>
-            and
-            <strong class="cred">
-              {{ pluralize(`${sumRemovedLines} deletion`, sumRemovedLines) }}
-            </strong>
-          </span>
-          <div
-            class="js-diff-stats-additions-deletions-collapsed
-            diff-stats-additions-deletions-collapsed float-right d-sm-none"
-          >
-            <strong class="cgreen">
-              +{{ sumAddedLines }}
-            </strong>
-            <strong class="cred">
-              -{{ sumRemovedLines }}
-            </strong>
-          </div>
-        </div>
-      </div>
-    </div>
-  </span>
-</template>

app/assets/javascripts/diffs/components/changed_files_dropdown.vue

-<script>
-import Icon from '~/vue_shared/components/icon.vue';
-import changedFilesMixin from '../mixins/changed_files';
-
-export default {
-  components: {
-    Icon,
-  },
-  mixins: [changedFilesMixin],
-  data() {
-    return {
-      searchText: '',
-    };
-  },
-  computed: {
-    filteredDiffFiles() {
-      return this.diffFiles.filter(file =>
-        file.filePath.toLowerCase().includes(this.searchText.toLowerCase()),
-      );
-    },
-  },
-  methods: {
-    clearSearch() {
-      this.searchText = '';
-    },
-  },
-};
-</script>
-
-<template>
-  <span>
-    Showing
-    <button
-      class="diff-stats-summary-toggler"
-      data-toggle="dropdown"
-      type="button"
-      aria-expanded="false"
-    >
-      <span>
-        {{ n__('%d changed file', '%d changed files', diffFiles.length) }}
-      </span>
-      <icon
-        class="caret-icon"
-        name="chevron-down"
-      />
-    </button>
-    <div class="dropdown-menu diff-file-changes">
-      <div class="dropdown-input">
-        <input
-          v-model="searchText"
-          type="search"
-          class="dropdown-input-field"
-          placeholder="Search files"
-          autocomplete="off"
-        />
-        <i
-          v-if="searchText.length === 0"
-          aria-hidden="true"
-          data-hidden="true"
-          class="fa fa-search dropdown-input-search">
-        </i>
-        <i
-          v-else
-          role="button"
-          class="fa fa-times dropdown-input-search"
-          @click.stop.prevent="clearSearch"
-        ></i>
-      </div>
-      <div class="dropdown-content">
-        <ul>
-          <li
-            v-for="diffFile in filteredDiffFiles"
-            :key="diffFile.name"
-          >
-            <a
-              :href="`#${diffFile.fileHash}`"
-              :title="diffFile.newPath"
-              class="diff-changed-file"
-            >
-              <icon
-                :name="fileChangedIcon(diffFile)"
-                :size="16"
-                :class="fileChangedClass(diffFile)"
-                class="diff-file-changed-icon append-right-8"
-              />
-              <span class="diff-changed-file-content append-right-8">
-                <strong
-                  v-if="diffFile.blob && diffFile.blob.name"
-                  class="diff-changed-file-name"
-                >
-                  {{ diffFile.blob.name }}
-                </strong>
-                <strong
-                  v-else
-                  class="diff-changed-blank-file-name"
-                >
-                  {{ s__('Diffs|No file name available') }}
-                </strong>
-                <span class="diff-changed-file-path prepend-top-5">
-                  {{ truncatedDiffPath(diffFile.blob.path) }}
-                </span>
-              </span>
-              <span class="diff-changed-stats">
-                <span class="cgreen">
-                  +{{ diffFile.addedLines }}
-                </span>
-                <span class="cred">
-                  -{{ diffFile.removedLines }}
-                </span>
-              </span>
-            </a>
-          </li>
-
-          <li
-            v-show="filteredDiffFiles.length === 0"
-            class="dropdown-menu-empty-item"
-          >
-            <a>
-              {{ __('No files found') }}
-            </a>
-          </li>
-        </ul>
-      </div>
-    </div>
-  </span>
-</template>

app/assets/javascripts/diffs/components/compare_versions.vue

 <script>
+import { mapActions, mapGetters, mapState } from 'vuex';
+import Tooltip from '@gitlab-org/gitlab-ui/dist/directives/tooltip';
+import { __ } from '~/locale';
+import { getParameterValues, mergeUrlParams } from '~/lib/utils/url_utility';
+import Icon from '~/vue_shared/components/icon.vue';
 import CompareVersionsDropdown from './compare_versions_dropdown.vue';
 export default {
   components: {
     CompareVersionsDropdown,
+    Icon,
+  },
+  directives: {
+    Tooltip,
   },
   props: {
     mergeRequestDiffs: {
@@ -26,30 +35,119 @@ export default {
     },
   },
   computed: {
+    ...mapState('diffs', ['commit', 'showTreeList']),
+    ...mapGetters('diffs', ['isInlineView', 'isParallelView', 'areAllFilesCollapsed']),
     comparableDiffs() {
       return this.mergeRequestDiffs.slice(1);
     },
+    isWhitespaceVisible() {
+      return !getParameterValues('w')[0];
+    },
+    toggleWhitespaceText() {
+      if (this.isWhitespaceVisible) {
+        return __('Hide whitespace changes');
+      }
+      return __('Show whitespace changes');
+    },
+    toggleWhitespacePath() {
+      if (this.isWhitespaceVisible) {
+        return mergeUrlParams({ w: 1 }, window.location.href);
+      }
+
+      return mergeUrlParams({ w: 0 }, window.location.href);
+    },
+    showDropdowns() {
+      return !this.commit && this.mergeRequestDiffs.length;
+    },
+  },
+  methods: {
+    ...mapActions('diffs', [
+      'setInlineDiffViewType',
+      'setParallelDiffViewType',
+      'expandAllFiles',
+      'toggleShowTreeList',
+    ]),
   },
 };
 </script>
 <template>
   <div class="mr-version-controls">
-    <div class="mr-version-menus-container content-block">
-      Changes between
-      <compare-versions-dropdown
-        :other-versions="mergeRequestDiffs"
-        :merge-request-version="mergeRequestDiff"
-        :show-commit-count="true"
-        class="mr-version-dropdown"
-      />
-      and
-      <compare-versions-dropdown
-        :other-versions="comparableDiffs"
-        :start-version="startVersion"
-        :target-branch="targetBranch"
-        class="mr-version-compare-dropdown"
-      />
+    <div
+      class="mr-version-menus-container content-block"
+    >
+      <button
+        v-tooltip.hover
+        type="button"
+        class="btn btn-default append-right-8 js-toggle-tree-list"
+        :class="{
+          active: showTreeList
+        }"
+        :title="__('Toggle file browser')"
+        @click="toggleShowTreeList"
+      >
+        <icon
+          name="hamburger"
+        />
+      </button>
+      <div
+        v-if="showDropdowns"
+        class="d-flex align-items-center compare-versions-container"
+      >
+        Changes between
+        <compare-versions-dropdown
+          :other-versions="mergeRequestDiffs"
+          :merge-request-version="mergeRequestDiff"
+          :show-commit-count="true"
+          class="mr-version-dropdown"
+        />
+        and
+        <compare-versions-dropdown
+          :other-versions="comparableDiffs"
+          :start-version="startVersion"
+          :target-branch="targetBranch"
+          class="mr-version-compare-dropdown"
+        />
+      </div>
+      <div
+        class="inline-parallel-buttons d-none d-md-flex ml-auto"
+      >
+        <a
+          v-if="areAllFilesCollapsed"
+          class="btn btn-default"
+          @click="expandAllFiles"
+        >
+          {{ __('Expand all') }}
+        </a>
+        <a
+          :href="toggleWhitespacePath"
+          class="btn btn-default"
+        >
+          {{ toggleWhitespaceText }}
+        </a>
+        <div class="btn-group prepend-left-8">
+          <button
+            id="inline-diff-btn"
+            :class="{ active: isInlineView }"
+            type="button"
+            class="btn js-inline-diff-button"
+            data-view-type="inline"
+            @click="setInlineDiffViewType"
+          >
+            {{ __('Inline') }}
+          </button>
+          <button
+            id="parallel-diff-btn"
+            :class="{ active: isParallelView }"
+            type="button"
+            class="btn js-parallel-diff-button"
+            data-view-type="parallel"
+            @click="setParallelDiffViewType"
+          >
+            {{ __('Side-by-side') }}
+          </button>
+        </div>
+      </div>
     </div>
   </div>
 </template>

app/assets/javascripts/diffs/components/compare_versions_dropdown.vue

@@ -108,7 +108,7 @@ export default {
 <template>
   <span class="dropdown inline">
     <a
-      class="dropdown-toggle btn btn-default"
+      class="dropdown-menu-toggle btn btn-default w-100"
       data-toggle="dropdown"
       aria-expanded="false"
     >
@@ -118,6 +118,7 @@ export default {
       <Icon
         :size="12"
         name="angle-down"
+        class="position-absolute"
       />
     </a>
     <div class="dropdown-menu dropdown-select dropdown-menu-selectable">
@@ -163,3 +164,10 @@ export default {
     </div>
   </span>
 </template>
+
+<style>
+.dropdown {
+  min-width: 0;
+  max-height: 170px;
+}
+</style>

app/assets/javascripts/diffs/components/diff_file.vue

 <script>
-import { mapActions, mapGetters } from 'vuex';
+import { mapActions, mapGetters, mapState } from 'vuex';
 import _ from 'underscore';
 import { __, sprintf } from '~/locale';
 import createFlash from '~/flash';
@@ -28,6 +28,7 @@ export default {
     };
   },
   computed: {
+    ...mapState('diffs', ['currentDiffFileId']),
     ...mapGetters(['isNotesFetched', 'discussionsStructuredByLineCode']),
     isCollapsed() {
       return this.file.collapsed || false;
@@ -101,6 +102,9 @@ export default {
 <template>
   <div
     :id="file.fileHash"
+    :class="{
+      'is-active': currentDiffFileId === file.fileHash
+    }"
     class="diff-file file-holder"
   >
     <diff-file-header
@@ -168,3 +172,20 @@ export default {
     </div>
   </div>
 </template>
+
+<style>
+@keyframes shadow-fade {
+  from {
+    box-shadow: 0 0 4px #919191;
+  }
+
+  to {
+    box-shadow: 0 0 0 #dfdfdf;
+  }
+}
+
+.diff-file.is-active {
+  box-shadow: 0 0 0 #dfdfdf;
+  animation: shadow-fade 1.2s 0.1s 1;
+}
+</style>

app/assets/javascripts/diffs/components/file_row_stats.vue

+<script>
+export default {
+  props: {
+    file: {
+      type: Object,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <span
+    v-once
+    class="file-row-stats"
+  >
+    <span class="cgreen">
+      +{{ file.addedLines }}
+    </span>
+    <span class="cred">
+      -{{ file.removedLines }}
+    </span>
+  </span>
+</template>
+
+<style>
+.file-row-stats {
+  font-size: 12px;
+}
+</style>

app/assets/javascripts/diffs/components/tree_list.vue

+<script>
+import { mapActions, mapGetters, mapState } from 'vuex';
+import Icon from '~/vue_shared/components/icon.vue';
+import FileRow from '~/vue_shared/components/file_row.vue';
+import FileRowStats from './file_row_stats.vue';
+
+export default {
+  components: {
+    Icon,
+    FileRow,
+  },
+  data() {
+    return {
+      search: '',
+    };
+  },
+  computed: {
+    ...mapState('diffs', ['tree', 'addedLines', 'removedLines']),
+    ...mapGetters('diffs', ['allBlobs', 'diffFilesLength']),
+    filteredTreeList() {
+      const search = this.search.toLowerCase().trim();
+
+      if (search === '') return this.tree;
+
+      return this.allBlobs.filter(f => f.name.toLowerCase().indexOf(search) >= 0);
+    },
+  },
+  methods: {
+    ...mapActions('diffs', ['toggleTreeOpen', 'scrollToFile']),
+    clearSearch() {
+      this.search = '';
+    },
+  },
+  FileRowStats,
+};
+</script>
+
+<template>
+  <div class="tree-list-holder d-flex flex-column">
+    <div class="append-bottom-8 position-relative tree-list-search">
+      <icon
+        name="search"
+        class="position-absolute tree-list-icon"
+      />
+      <input
+        v-model="search"
+        :placeholder="s__('MergeRequest|Filter files')"
+        type="search"
+        class="form-control"
+      />
+      <button
+        v-show="search"
+        :aria-label="__('Clear search')"
+        type="button"
+        class="position-absolute tree-list-icon tree-list-clear-icon border-0 p-0"
+        @click="clearSearch"
+      >
+        <icon
+          name="close"
+        />
+      </button>
+    </div>
+    <div
+      class="tree-list-scroll"
+    >
+      <template v-if="filteredTreeList.length">
+        <file-row
+          v-for="file in filteredTreeList"
+          :key="file.key"
+          :file="file"
+          :level="0"
+          :hide-extra-on-tree="true"
+          :extra-component="$options.FileRowStats"
+          :show-changed-icon="true"
+          @toggleTreeOpen="toggleTreeOpen"
+          @clickFile="scrollToFile"
+        />
+      </template>
+      <p
+        v-else
+        class="prepend-top-20 append-bottom-20 text-center"
+      >
+        {{ s__('MergeRequest|No files found') }}
+      </p>
+    </div>
+    <div
+      v-once
+      class="pt-3 pb-3 text-center"
+    >
+      {{ n__('%d changed file', '%d changed files', diffFilesLength) }}
+      <div>
+        <span class="cgreen">
+          {{ n__('%d addition', '%d additions', addedLines) }}
+        </span>
+        <span class="cred">
+          {{ n__('%d deleted', '%d deletions', removedLines) }}
+        </span>
+      </div>
+    </div>
+  </div>
+</template>

app/assets/javascripts/diffs/constants.js

@@ -29,3 +29,5 @@ export const LENGTH_OF_AVATAR_TOOLTIP = 17;
 export const LINES_TO_BE_RENDERED_DIRECTLY = 100;
 export const MAX_LINES_TO_BE_RENDERED = 2000;
+
+export const MR_TREE_SHOW_KEY = 'mr_tree_show';

app/assets/javascripts/diffs/mixins/changed_files.js

-export default {
-  props: {
-    diffFiles: {
-      type: Array,
-      required: true,
-    },
-  },
-  methods: {
-    fileChangedIcon(diffFile) {
-      if (diffFile.deletedFile) {
-        return 'file-deletion';
-      } else if (diffFile.newFile) {
-        return 'file-addition';
-      }
-      return 'file-modified';
-    },
-    fileChangedClass(diffFile) {
-      if (diffFile.deletedFile) {
-        return 'cred';
-      } else if (diffFile.newFile) {
-        return 'cgreen';
-      }
-
-      return '';
-    },
-    truncatedDiffPath(path) {
-      const maxLength = 60;
-
-      if (path.length > maxLength) {
-        const start = path.length - maxLength;
-        const end = start + maxLength;
-        return `...${path.slice(start, end)}`;
-      }
-
-      return path;
-    },
-  },
-};

app/assets/javascripts/diffs/store/actions.js

@@ -12,6 +12,7 @@ import {
   PARALLEL_DIFF_VIEW_TYPE,
   INLINE_DIFF_VIEW_TYPE,
   DIFF_VIEW_COOKIE_NAME,
+  MR_TREE_SHOW_KEY,
 } from '../constants';
 export const setBaseConfig = ({ commit }, options) => {
@@ -195,5 +196,23 @@ export const saveDiffDiscussion = ({ dispatch }, { note, formData }) => {
     .catch(() => createFlash(s__('MergeRequests|Saving the comment failed')));
 };
+export const toggleTreeOpen = ({ commit }, path) => {
+  commit(types.TOGGLE_FOLDER_OPEN, path);
+};
+
+export const scrollToFile = ({ state, commit }, path) => {
+  const { fileHash } = state.treeEntries[path];
+  document.location.hash = fileHash;
+
+  commit(types.UPDATE_CURRENT_DIFF_FILE_ID, fileHash);
+
+  setTimeout(() => commit(types.UPDATE_CURRENT_DIFF_FILE_ID, ''), 1000);
+};
+
+export const toggleShowTreeList = ({ commit, state }) => {
+  commit(types.TOGGLE_SHOW_TREE_LIST);
+  localStorage.setItem(MR_TREE_SHOW_KEY, state.showTreeList);
+};
+
 // prevent babel-plugin-rewire from generating an invalid default during karma tests
 export default () => {};

app/assets/javascripts/diffs/store/getters.js

@@ -110,5 +110,9 @@ export const shouldRenderInlineCommentRow = state => line => {
 export const getDiffFileByHash = state => fileHash =>
   state.diffFiles.find(file => file.fileHash === fileHash);
+export const allBlobs = state => Object.values(state.treeEntries).filter(f => f.type === 'blob');
+
+export const diffFilesLength = state => state.diffFiles.length;
+
 // prevent babel-plugin-rewire from generating an invalid default during karma tests
 export default () => {};

app/assets/javascripts/diffs/store/modules/diff_state.js

 import Cookies from 'js-cookie';
 import { getParameterValues } from '~/lib/utils/url_utility';
-import { INLINE_DIFF_VIEW_TYPE, DIFF_VIEW_COOKIE_NAME } from '../../constants';
+import { INLINE_DIFF_VIEW_TYPE, DIFF_VIEW_COOKIE_NAME, MR_TREE_SHOW_KEY } from '../../constants';
 const viewTypeFromQueryString = getParameterValues('view')[0];
 const viewTypeFromCookie = Cookies.get(DIFF_VIEW_COOKIE_NAME);
 const defaultViewType = INLINE_DIFF_VIEW_TYPE;
+const storedTreeShow = localStorage.getItem(MR_TREE_SHOW_KEY);
 export default () => ({
   isLoading: true,
@@ -17,4 +18,8 @@ export default () => ({
   mergeRequestDiff: null,
   diffLineCommentForms: {},
   diffViewType: viewTypeFromQueryString || viewTypeFromCookie || defaultViewType,
+  tree: [],
+  treeEntries: {},
+  showTreeList: storedTreeShow === null ? true : storedTreeShow === 'true',
+  currentDiffFileId: '',
 });

app/assets/javascripts/diffs/store/mutation_types.js

@@ -11,3 +11,6 @@ export const EXPAND_ALL_FILES = 'EXPAND_ALL_FILES';
 export const RENDER_FILE = 'RENDER_FILE';
 export const SET_LINE_DISCUSSIONS_FOR_FILE = 'SET_LINE_DISCUSSIONS_FOR_FILE';
 export const REMOVE_LINE_DISCUSSIONS_FOR_FILE = 'REMOVE_LINE_DISCUSSIONS_FOR_FILE';
+export const TOGGLE_FOLDER_OPEN = 'TOGGLE_FOLDER_OPEN';
+export const TOGGLE_SHOW_TREE_LIST = 'TOGGLE_SHOW_TREE_LIST';
+export const UPDATE_CURRENT_DIFF_FILE_ID = 'UPDATE_CURRENT_DIFF_FILE_ID';

app/assets/javascripts/diffs/store/mutations.js

 import Vue from 'vue';
 import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
+import { sortTree } from '~/ide/stores/utils';
 import {
   findDiffFile,
   addLineReferences,
@@ -7,6 +8,7 @@ import {
   addContextLines,
   prepareDiffData,
   isDiscussionApplicableToLine,
+  generateTreeList,
 } from './utils';
 import * as types from './mutation_types';
@@ -23,9 +25,12 @@ export default {
   [types.SET_DIFF_DATA](state, data) {
     const diffData = convertObjectPropsToCamelCase(data, { deep: true });
     prepareDiffData(diffData);
+    const { tree, treeEntries } = generateTreeList(diffData.diffFiles);
     Object.assign(state, {
       ...diffData,
+      tree: sortTree(tree),
+      treeEntries,
     });
   },
@@ -163,4 +168,13 @@ export default {
       }
     }
   },
+  [types.TOGGLE_FOLDER_OPEN](state, path) {
+    state.treeEntries[path].opened = !state.treeEntries[path].opened;
+  },
+  [types.TOGGLE_SHOW_TREE_LIST](state) {
+    state.showTreeList = !state.showTreeList;
+  },
+  [types.UPDATE_CURRENT_DIFF_FILE_ID](state, fileId) {
+    state.currentDiffFileId = fileId;
+  },
 };

app/assets/javascripts/diffs/store/utils.js

@@ -267,3 +267,49 @@ export function isDiscussionApplicableToLine({ discussion, diffPosition, latestD
   return latestDiff && discussion.active && lineCode === discussion.line_code;
 }
+
+export const generateTreeList = files =>
+  files.reduce(
+    (acc, file) => {
+      const { fileHash, addedLines, removedLines, newFile, deletedFile, newPath } = file;
+      const split = newPath.split('/');
+
+      split.forEach((name, i) => {
+        const parent = acc.treeEntries[split.slice(0, i).join('/')];
+        const path = `${parent ? `${parent.path}/` : ''}${name}`;
+
+        if (!acc.treeEntries[path]) {
+          const type = path === newPath ? 'blob' : 'tree';
+          acc.treeEntries[path] = {
+            key: path,
+            path,
+            name,
+            type,
+            tree: [],
+          };
+
+          const entry = acc.treeEntries[path];
+
+          if (type === 'blob') {
+            Object.assign(entry, {
+              changed: true,
+              tempFile: newFile,
+              deleted: deletedFile,
+              fileHash,
+              addedLines,
+              removedLines,
+            });
+          } else {
+            Object.assign(entry, {
+              opened: true,
+            });
+          }
+
+          (parent ? parent.tree : acc.tree).push(entry);
+        }
+      });
+
+      return acc;
+    },
+    { treeEntries: {}, tree: [] },
+  );

app/assets/javascripts/ide/components/commit_sidebar/editor_header.vue

@@ -3,7 +3,7 @@ import $ from 'jquery';
 import { mapActions } from 'vuex';
 import { __ } from '~/locale';
 import FileIcon from '~/vue_shared/components/file_icon.vue';
-import ChangedFileIcon from '../changed_file_icon.vue';
+import ChangedFileIcon from '~/vue_shared/components/changed_file_icon.vue';
 export default {
   components: {

app/assets/javascripts/ide/components/file_finder/item.vue

 <script>
 import fuzzaldrinPlus from 'fuzzaldrin-plus';
 import FileIcon from '../../../vue_shared/components/file_icon.vue';
-import ChangedFileIcon from '../changed_file_icon.vue';
+import ChangedFileIcon from '../../../vue_shared/components/changed_file_icon.vue';
 const MAX_PATH_LENGTH = 60;

app/assets/javascripts/ide/components/file_row_extra.vue

@@ -3,8 +3,8 @@ import { mapGetters } from 'vuex';
 import { n__, __, sprintf } from '~/locale';
 import tooltip from '~/vue_shared/directives/tooltip';
 import Icon from '~/vue_shared/components/icon.vue';
+import ChangedFileIcon from '~/vue_shared/components/changed_file_icon.vue';
 import NewDropdown from './new_dropdown/index.vue';
-import ChangedFileIcon from './changed_file_icon.vue';
 import MrFileIcon from './mr_file_icon.vue';
 export default {

app/assets/javascripts/ide/components/repo_tab.vue

@@ -3,8 +3,8 @@ import { mapActions } from 'vuex';
 import FileIcon from '~/vue_shared/components/file_icon.vue';
 import Icon from '~/vue_shared/components/icon.vue';
+import ChangedFileIcon from '~/vue_shared/components/changed_file_icon.vue';
 import FileStatusIcon from './repo_file_status_icon.vue';
-import ChangedFileIcon from './changed_file_icon.vue';
 export default {
   components: {