Added fuzzy file finder to merge requests

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53304

22 files changed, 404 insertions, 304 deletions

diff --git a/app/assets/javascripts/diffs/components/app.vue b/app/assets/javascripts/diffs/components/app.vue
index d4c1b07093d..f0ce2579ee7 100644
--- a/app/assets/javascripts/diffs/components/app.vue
+++ b/app/assets/javascripts/diffs/components/app.vue
@@ -129,6 +129,10 @@ export default {
   created() {
     this.adjustView();
     eventHub.$once('fetchedNotesData', this.setDiscussions);
+    eventHub.$once('fetchDiffData', this.fetchData);
+  },
+  beforeDestroy() {
+    eventHub.$off('fetchDiffData', this.fetchData);
   },
   methods: {
     ...mapActions(['startTaskList']),
diff --git a/app/assets/javascripts/diffs/components/tree_list.vue b/app/assets/javascripts/diffs/components/tree_list.vue
index 0b3def3d29d..a0f09932593 100644
--- a/app/assets/javascripts/diffs/components/tree_list.vue
+++ b/app/assets/javascripts/diffs/components/tree_list.vue
@@ -13,39 +13,17 @@ export default {
     Icon,
     FileRow,
   },
-  data() {
-    return {
-      search: '',
-    };
-  },
   computed: {
     ...mapState('diffs', ['tree', 'addedLines', 'removedLines', 'renderTreeList']),
     ...mapGetters('diffs', ['allBlobs', 'diffFilesLength']),
     filteredTreeList() {
-      const search = this.search.toLowerCase().trim();
-
-      if (search === '') return this.renderTreeList ? this.tree : this.allBlobs;
-
-      return this.allBlobs.reduce((acc, folder) => {
-        const tree = folder.tree.filter(f => f.path.toLowerCase().indexOf(search) >= 0);
-
-        if (tree.length) {
-          return acc.concat({
-            ...folder,
-            tree,
-          });
-        }
-
-        return acc;
-      }, []);
+      return this.renderTreeList ? this.tree : this.allBlobs;
     },
   },
   methods: {
-    ...mapActions('diffs', ['toggleTreeOpen', 'scrollToFile']),
-    clearSearch() {
-      this.search = '';
-    },
+    ...mapActions('diffs', ['toggleTreeOpen', 'scrollToFile', 'toggleFileFinder']),
   },
+  shortcutKeyCharacter: `${/Mac/i.test(navigator.userAgent) ? '⌘' : 'Ctrl'}+P`,
   FileRowStats,
 };
 </script>
@@ -55,21 +33,17 @@ export default {
     <div class="append-bottom-8 position-relative tree-list-search d-flex">
       <div class="flex-fill d-flex">
         <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 bg-transparent tree-list-icon tree-list-clear-icon border-0 p-0"
-          @click="clearSearch"
+          class="form-control text-left text-secondary"
+          @click="toggleFileFinder(true)"
         >
-          <icon name="close" />
+          {{ s__('MergeRequest|Search files') }}
         </button>
+        <span
+          class="position-absolute text-secondary diff-tree-search-shortcut"
+          v-html="$options.shortcutKeyCharacter"
+        ></span>
       </div>
     </div>
     <div :class="{ 'pt-0 tree-list-blobs': !renderTreeList }" class="tree-list-scroll">
@@ -104,4 +78,15 @@ export default {
 .tree-list-blobs .file-row-name {
   margin-left: 12px;
 }
+
+.diff-tree-search-shortcut {
+  top: 50%;
+  right: 10px;
+  transform: translateY(-50%);
+  pointer-events: none;
+}
+
+.tree-list-icon {
+  pointer-events: none;
+}
 </style>
diff --git a/app/assets/javascripts/diffs/index.js b/app/assets/javascripts/diffs/index.js
index 094e5cdea9c..63954d9d412 100644
--- a/app/assets/javascripts/diffs/index.js
+++ b/app/assets/javascripts/diffs/index.js
@@ -1,11 +1,60 @@
 import Vue from 'vue';
-import { mapActions, mapState } from 'vuex';
+import { mapActions, mapState, mapGetters } from 'vuex';
 import { parseBoolean } from '~/lib/utils/common_utils';
 import { getParameterValues } from '~/lib/utils/url_utility';
+import FindFile from '~/vue_shared/components/file_finder/index.vue';
+import eventHub from '../notes/event_hub';
 import diffsApp from './components/app.vue';
 import { TREE_LIST_STORAGE_KEY } from './constants';
 
 export default function initDiffsApp(store) {
+  const fileFinderEl = document.getElementById('js-diff-file-finder');
+
+  if (fileFinderEl) {
+    // eslint-disable-next-line no-new
+    new Vue({
+      el: fileFinderEl,
+      store,
+      computed: {
+        ...mapState('diffs', ['fileFinderVisible', 'isLoading']),
+        ...mapGetters('diffs', ['flatBlobsList']),
+      },
+      watch: {
+        fileFinderVisible(newVal, oldVal) {
+          if (newVal && !oldVal && !this.flatBlobsList.length) {
+            eventHub.$emit('fetchDiffData');
+          }
+        },
+      },
+      methods: {
+        ...mapActions('diffs', ['toggleFileFinder', 'scrollToFile']),
+        openFile(file) {
+          window.mrTabs.tabShown('diffs');
+          this.scrollToFile(file.path);
+        },
+      },
+      render(createElement) {
+        return createElement(FindFile, {
+          props: {
+            files: this.flatBlobsList,
+            visible: this.fileFinderVisible,
+            loading: this.isLoading,
+            showDiffStats: true,
+            clearSearchOnClose: false,
+          },
+          on: {
+            toggle: this.toggleFileFinder,
+            click: this.openFile,
+          },
+          class: ['diff-file-finder'],
+          style: {
+            display: this.fileFinderVisible ? '' : 'none',
+          },
+        });
+      },
+    });
+  }
+
   return new Vue({
     el: '#js-diffs-app',
     name: 'MergeRequestDiffs',
diff --git a/app/assets/javascripts/diffs/store/actions.js b/app/assets/javascripts/diffs/store/actions.js
index 2c5019fb652..7fb66ce433b 100644
--- a/app/assets/javascripts/diffs/store/actions.js
+++ b/app/assets/javascripts/diffs/store/actions.js
@@ -296,5 +296,9 @@ export const setShowWhitespace = ({ commit }, { showWhitespace, pushState = fals
   }
 };
 
+export const toggleFileFinder = ({ commit }, visible) => {
+  commit(types.TOGGLE_FILE_FINDER_VISIBLE, visible);
+};
+
 // prevent babel-plugin-rewire from generating an invalid default during karma tests
 export default () => {};
diff --git a/app/assets/javascripts/diffs/store/getters.js b/app/assets/javascripts/diffs/store/getters.js
index 86c0c7190f9..0e1ad654a2b 100644
--- a/app/assets/javascripts/diffs/store/getters.js
+++ b/app/assets/javascripts/diffs/store/getters.js
@@ -74,24 +74,25 @@ export const getDiffFileDiscussions = (state, getters, rootState, rootGetters) =
 export const getDiffFileByHash = state => fileHash =>
   state.diffFiles.find(file => file.file_hash === fileHash);
 
-export const allBlobs = state =>
-  Object.values(state.treeEntries)
-    .filter(f => f.type === 'blob')
-    .reduce((acc, file) => {
-      const { parentPath } = file;
-
-      if (parentPath && !acc.some(f => f.path === parentPath)) {
-        acc.push({
-          path: parentPath,
-          isHeader: true,
-          tree: [],
-        });
-      }
-
-      acc.find(f => f.path === parentPath).tree.push(file);
-
-      return acc;
-    }, []);
+export const flatBlobsList = state =>
+  Object.values(state.treeEntries).filter(f => f.type === 'blob');
+
+export const allBlobs = (state, getters) =>
+  getters.flatBlobsList.reduce((acc, file) => {
+    const { parentPath } = file;
+
+    if (parentPath && !acc.some(f => f.path === parentPath)) {
+      acc.push({
+        path: parentPath,
+        isHeader: true,
+        tree: [],
+      });
+    }
+
+    acc.find(f => f.path === parentPath).tree.push(file);
+
+    return acc;
+  }, []);
 
 export const diffFilesLength = state => state.diffFiles.length;
 
diff --git a/app/assets/javascripts/diffs/store/modules/diff_state.js b/app/assets/javascripts/diffs/store/modules/diff_state.js
index 05b4c552f6e..6ee33d9fc6d 100644
--- a/app/assets/javascripts/diffs/store/modules/diff_state.js
+++ b/app/assets/javascripts/diffs/store/modules/diff_state.js
@@ -29,4 +29,5 @@ export default () => ({
   highlightedRow: null,
   renderTreeList: true,
   showWhitespace: true,
+  fileFinderVisible: false,
 });
diff --git a/app/assets/javascripts/diffs/store/mutation_types.js b/app/assets/javascripts/diffs/store/mutation_types.js
index e760b4d1079..71ad108ce88 100644
--- a/app/assets/javascripts/diffs/store/mutation_types.js
+++ b/app/assets/javascripts/diffs/store/mutation_types.js
@@ -22,3 +22,4 @@ export const SET_HIGHLIGHTED_ROW = 'SET_HIGHLIGHTED_ROW';
 export const SET_TREE_DATA = 'SET_TREE_DATA';
 export const SET_RENDER_TREE_LIST = 'SET_RENDER_TREE_LIST';
 export const SET_SHOW_WHITESPACE = 'SET_SHOW_WHITESPACE';
+export const TOGGLE_FILE_FINDER_VISIBLE = 'TOGGLE_FILE_FINDER_VISIBLE';
diff --git a/app/assets/javascripts/diffs/store/mutations.js b/app/assets/javascripts/diffs/store/mutations.js
index 4aeb393b29b..7bbafe66199 100644
--- a/app/assets/javascripts/diffs/store/mutations.js
+++ b/app/assets/javascripts/diffs/store/mutations.js
@@ -244,4 +244,7 @@ export default {
   [types.SET_SHOW_WHITESPACE](state, showWhitespace) {
     state.showWhitespace = showWhitespace;
   },
+  [types.TOGGLE_FILE_FINDER_VISIBLE](state, visible) {
+    state.fileFinderVisible = visible;
+  },
 };
diff --git a/app/assets/javascripts/ide/components/ide.vue b/app/assets/javascripts/ide/components/ide.vue
index caec8779cac..9894ebb0624 100644
--- a/app/assets/javascripts/ide/components/ide.vue
+++ b/app/assets/javascripts/ide/components/ide.vue
@@ -1,20 +1,17 @@
 <script>
 import Vue from 'vue';
-import Mousetrap from 'mousetrap';
 import { mapActions, mapState, mapGetters } from 'vuex';
 import { __ } from '~/locale';
+import FindFile from '~/vue_shared/components/file_finder/index.vue';
 import NewModal from './new_dropdown/modal.vue';
 import IdeSidebar from './ide_side_bar.vue';
 import RepoTabs from './repo_tabs.vue';
 import IdeStatusBar from './ide_status_bar.vue';
 import RepoEditor from './repo_editor.vue';
-import FindFile from './file_finder/index.vue';
 import RightPane from './panes/right.vue';
 import ErrorMessage from './error_message.vue';
 import CommitEditorHeader from './commit_sidebar/editor_header.vue';
 
-const originalStopCallback = Mousetrap.stopCallback;
-
 export default {
   components: {
     NewModal,
@@ -42,21 +39,18 @@ export default {
       'emptyStateSvgPath',
       'currentProjectId',
       'errorMessage',
+      'loading',
+    ]),
+    ...mapGetters([
+      'activeFile',
+      'hasChanges',
+      'someUncommittedChanges',
+      'isCommitModeActive',
+      'allBlobs',
     ]),
-    ...mapGetters(['activeFile', 'hasChanges', 'someUncommittedChanges', 'isCommitModeActive']),
   },
   mounted() {
     window.onbeforeunload = e => this.onBeforeUnload(e);
-
-    Mousetrap.bind(['t', 'command+p', 'ctrl+p'], e => {
-      if (e.preventDefault) {
-        e.preventDefault();
-      }
-
-      this.toggleFileFinder(!this.fileFindVisible);
-    });
-
-    Mousetrap.stopCallback = (e, el, combo) => this.mousetrapStopCallback(e, el, combo);
   },
   methods: {
     ...mapActions(['toggleFileFinder']),
@@ -70,17 +64,8 @@ export default {
       });
       return returnValue;
     },
-    mousetrapStopCallback(e, el, combo) {
-      if (
-        (combo === 't' && el.classList.contains('dropdown-input-field')) ||
-        el.classList.contains('inputarea')
-      ) {
-        return true;
-      } else if (combo === 'command+p' || combo === 'ctrl+p') {
-        return false;
-      }
-
-      return originalStopCallback(e, el, combo);
+    openFile(file) {
+      this.$router.push(`/project${file.url}`);
     },
   },
 };
@@ -90,7 +75,14 @@ export default {
   <article class="ide position-relative d-flex flex-column align-items-stretch">
     <error-message v-if="errorMessage" :message="errorMessage" />
     <div class="ide-view flex-grow d-flex">
-      <find-file v-show="fileFindVisible" />
+      <find-file
+        v-show="fileFindVisible"
+        :files="allBlobs"
+        :visible="fileFindVisible"
+        :loading="loading"
+        @toggle="toggleFileFinder"
+        @click="openFile"
+      />
       <ide-sidebar />
       <div class="multi-file-edit-pane">
         <template v-if="activeFile">
diff --git a/app/assets/javascripts/ide/constants.js b/app/assets/javascripts/ide/constants.js
index 09245ed0296..804ebae4555 100644
--- a/app/assets/javascripts/ide/constants.js
+++ b/app/assets/javascripts/ide/constants.js
@@ -1,8 +1,3 @@
-// Fuzzy file finder
-export const MAX_FILE_FINDER_RESULTS = 40;
-export const FILE_FINDER_ROW_HEIGHT = 55;
-export const FILE_FINDER_EMPTY_ROW_HEIGHT = 33;
-
 export const MAX_WINDOW_HEIGHT_COMPACT = 750;
 
 // Commit message textarea
diff --git a/app/assets/javascripts/ide/components/file_finder/index.vue b/app/assets/javascripts/vue_shared/components/file_finder/index.vue
index 0b0cd7b75eb..b57455adaad 100644
--- a/app/assets/javascripts/ide/components/file_finder/index.vue
+++ b/app/assets/javascripts/vue_shared/components/file_finder/index.vue
@@ -1,45 +1,62 @@
 <script>
-import { mapActions, mapGetters, mapState } from 'vuex';
 import fuzzaldrinPlus from 'fuzzaldrin-plus';
+import Mousetrap from 'mousetrap';
 import VirtualList from 'vue-virtual-scroll-list';
 import Item from './item.vue';
-import router from '../../ide_router';
-import {
-  MAX_FILE_FINDER_RESULTS,
-  FILE_FINDER_ROW_HEIGHT,
-  FILE_FINDER_EMPTY_ROW_HEIGHT,
-} from '../../constants';
-import {
-  UP_KEY_CODE,
-  DOWN_KEY_CODE,
-  ENTER_KEY_CODE,
-  ESC_KEY_CODE,
-} from '../../../lib/utils/keycodes';
+import { UP_KEY_CODE, DOWN_KEY_CODE, ENTER_KEY_CODE, ESC_KEY_CODE } from '~/lib/utils/keycodes';
+
+export const MAX_FILE_FINDER_RESULTS = 40;
+export const FILE_FINDER_ROW_HEIGHT = 55;
+export const FILE_FINDER_EMPTY_ROW_HEIGHT = 33;
+
+const originalStopCallback = Mousetrap.stopCallback;
 
 export default {
   components: {
     Item,
     VirtualList,
   },
+  props: {
+    files: {
+      type: Array,
+      required: true,
+    },
+    visible: {
+      type: Boolean,
+      required: true,
+    },
+    loading: {
+      type: Boolean,
+      required: true,
+    },
+    showDiffStats: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    clearSearchOnClose: {
+      type: Boolean,
+      required: false,
+      default: true,
+    },
+  },
   data() {
     return {
-      focusedIndex: 0,
+      focusedIndex: -1,
       searchText: '',
       mouseOver: false,
       cancelMouseOver: false,
     };
   },
   computed: {
-    ...mapGetters(['allBlobs']),
-    ...mapState(['fileFindVisible', 'loading']),
     filteredBlobs() {
       const searchText = this.searchText.trim();
 
       if (searchText === '') {
-        return this.allBlobs.slice(0, MAX_FILE_FINDER_RESULTS);
+        return this.files.slice(0, MAX_FILE_FINDER_RESULTS);
       }
 
-      return fuzzaldrinPlus.filter(this.allBlobs, searchText, {
+      return fuzzaldrinPlus.filter(this.files, searchText, {
         key: 'path',
         maxResults: MAX_FILE_FINDER_RESULTS,
       });
@@ -58,10 +75,12 @@ export default {
     },
   },
   watch: {
-    fileFindVisible() {
+    visible() {
       this.$nextTick(() => {
-        if (!this.fileFindVisible) {
-          this.searchText = '';
+        if (!this.visible) {
+          if (this.clearSearchOnClose) {
+            this.searchText = '';
+          }
         } else {
           this.focusedIndex = 0;
 
@@ -72,7 +91,11 @@ export default {
       });
     },
     searchText() {
-      this.focusedIndex = 0;
+      this.focusedIndex = -1;
+
+      this.$nextTick(() => {
+        this.focusedIndex = 0;
+      });
     },
     focusedIndex() {
       if (!this.mouseOver) {
@@ -98,8 +121,25 @@ export default {
       }
     },
   },
+  mounted() {
+    if (this.files.length) {
+      this.focusedIndex = 0;
+    }
+
+    Mousetrap.bind(['t', 'command+p', 'ctrl+p'], e => {
+      if (e.preventDefault) {
+        e.preventDefault();
+      }
+
+      this.toggle(!this.visible);
+    });
+
+    Mousetrap.stopCallback = (e, el, combo) => this.mousetrapStopCallback(e, el, combo);
+  },
   methods: {
-    ...mapActions(['toggleFileFinder']),
+    toggle(visible) {
+      this.$emit('toggle', visible);
+    },
     clearSearchInput() {
       this.searchText = '';
 
@@ -139,15 +179,15 @@ export default {
           this.openFile(this.filteredBlobs[this.focusedIndex]);
           break;
         case ESC_KEY_CODE:
-          this.toggleFileFinder(false);
+          this.toggle(false);
           break;
         default:
           break;
       }
     },
     openFile(file) {
-      this.toggleFileFinder(false);
-      router.push(`/project${file.url}`);
+      this.toggle(false);
+      this.$emit('click', file);
     },
     onMouseOver(index) {
       if (!this.cancelMouseOver) {
@@ -159,14 +199,26 @@ export default {
       this.cancelMouseOver = false;
       this.onMouseOver(index);
     },
+    mousetrapStopCallback(e, el, combo) {
+      if (
+        (combo === 't' && el.classList.contains('dropdown-input-field')) ||
+        el.classList.contains('inputarea')
+      ) {
+        return true;
+      } else if (combo === 'command+p' || combo === 'ctrl+p') {
+        return false;
+      }
+
+      return originalStopCallback(e, el, combo);
+    },
   },
 };
 </script>
 
 <template>
-  <div class="ide-file-finder-overlay" @mousedown.self="toggleFileFinder(false)">
-    <div class="dropdown-menu diff-file-changes ide-file-finder show">
-      <div class="dropdown-input">
+  <div class="file-finder-overlay" @mousedown.self="toggle(false)">
+    <div class="dropdown-menu diff-file-changes file-finder show">
+      <div :class="{ 'has-value': showClearInputButton }" class="dropdown-input">
         <input
           ref="searchInput"
           v-model="searchText"
@@ -186,9 +238,6 @@ export default {
         ></i>
         <i
           :aria-label="__('Clear search input')"
-          :class="{
-            show: showClearInputButton,
-          }"
           role="button"
           class="fa fa-times dropdown-input-clear"
           @click="clearSearchInput"
@@ -203,6 +252,7 @@ export default {
                 :search-text="searchText"
                 :focused="index === focusedIndex"
                 :index="index"
+                :show-diff-stats="showDiffStats"
                 class="disable-hover"
                 @click="openFile"
                 @mouseover="onMouseOver"
@@ -225,3 +275,25 @@ export default {
     </div>
   </div>
 </template>
+
+<style scoped>
+.file-finder-overlay {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: 200;
+}
+
+.file-finder {
+  top: 10px;
+  left: 50%;
+  transform: translateX(-50%);
+}
+
+.diff-file-changes {
+  top: 50px;
+  max-height: 327px;
+}
+</style>
diff --git a/app/assets/javascripts/ide/components/file_finder/item.vue b/app/assets/javascripts/vue_shared/components/file_finder/item.vue
index 83e80d50aff..73511879ff2 100644
--- a/app/assets/javascripts/ide/components/file_finder/item.vue
+++ b/app/assets/javascripts/vue_shared/components/file_finder/item.vue
@@ -1,5 +1,6 @@
 <script>
 import fuzzaldrinPlus from 'fuzzaldrin-plus';
+import Icon from '~/vue_shared/components/icon.vue';
 import FileIcon from '../../../vue_shared/components/file_icon.vue';
 import ChangedFileIcon from '../../../vue_shared/components/changed_file_icon.vue';
 
@@ -7,6 +8,7 @@ const MAX_PATH_LENGTH = 60;
 
 export default {
   components: {
+    Icon,
     ChangedFileIcon,
     FileIcon,
   },
@@ -27,6 +29,11 @@ export default {
       type: Number,
       required: true,
     },
+    showDiffStats: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
   },
   computed: {
     pathWithEllipsis() {
@@ -97,8 +104,23 @@ export default {
         </span>
       </span>
     </span>
-    <span v-if="file.changed || file.tempFile" class="diff-changed-stats">
-      <changed-file-icon :file="file" />
+    <span v-if="file.changed || file.tempFile" v-once class="diff-changed-stats">
+      <span v-if="showDiffStats">
+        <span class="cgreen bold">
+          <icon name="file-addition" class="align-text-top" /> {{ file.addedLines }}
+        </span>
+        <span class="cred bold ml-1">
+          <icon name="file-deletion" class="align-text-top" /> {{ file.removedLines }}
+        </span>
+      </span>
+      <changed-file-icon v-else :file="file" />
     </span>
   </button>
 </template>
+
+<style scoped>
+.highlighted {
+  color: #1f78d1;
+  font-weight: 600;
+}
+</style>
diff --git a/app/assets/stylesheets/page_bundles/ide.scss b/app/assets/stylesheets/page_bundles/ide.scss
index 1f24b8dfa9e..2ac98b5d18f 100644
--- a/app/assets/stylesheets/page_bundles/ide.scss
+++ b/app/assets/stylesheets/page_bundles/ide.scss
@@ -816,26 +816,6 @@ $ide-commit-header-height: 48px;
   z-index: 1;
 }
 
-.ide-file-finder-overlay {
-  position: absolute;
-  top: 0;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  z-index: 100;
-}
-
-.ide-file-finder {
-  top: 10px;
-  left: 50%;
-  transform: translateX(-50%);
-
-  .highlighted {
-    color: $blue-500;
-    font-weight: $gl-font-weight-bold;
-  }
-}
-
 .ide-commit-message-field {
   height: 200px;
   background-color: $white-light;
diff --git a/app/assets/stylesheets/pages/merge_requests.scss b/app/assets/stylesheets/pages/merge_requests.scss
index 53afb182b54..38a7e199c6a 100644
--- a/app/assets/stylesheets/pages/merge_requests.scss
+++ b/app/assets/stylesheets/pages/merge_requests.scss
@@ -986,3 +986,9 @@
     width: $ci-action-icon-size-lg;
   }
 }
+
+.merge-request-details .file-finder-overlay.diff-file-finder {
+  position: fixed;
+  z-index: 99999;
+  background: $black-transparent;
+}
diff --git a/app/views/projects/merge_requests/show.html.haml b/app/views/projects/merge_requests/show.html.haml
index 0b720e5d542..5111c9fab8d 100644
--- a/app/views/projects/merge_requests/show.html.haml
+++ b/app/views/projects/merge_requests/show.html.haml
@@ -59,6 +59,7 @@
           #js-vue-discussion-counter
 
     .tab-content#diff-notes-app
+      #js-diff-file-finder
       #notes.notes.tab-pane.voting_notes
         .row
           %section.col-md-12
diff --git a/changelogs/unreleased/diff-file-finder.yml b/changelogs/unreleased/diff-file-finder.yml
new file mode 100644
index 00000000000..3160e9fc91b
--- /dev/null
+++ b/changelogs/unreleased/diff-file-finder.yml
@@ -0,0 +1,5 @@
+---
+title: Added fuzzy file finder to merge requests
+merge_request:
+author:
+type: changed
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 6b5b4e93e70..24ca8744414 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -4438,10 +4438,10 @@ msgstr ""
 msgid "MergeRequest| %{paragraphStart}changed the description %{descriptionChangedTimes} times %{timeDifferenceMinutes}%{paragraphEnd}"
 msgstr ""
 
-msgid "MergeRequest|Filter files"
+msgid "MergeRequest|No files found"
 msgstr ""
 
-msgid "MergeRequest|No files found"
+msgid "MergeRequest|Search files"
 msgstr ""
 
 msgid "Merged"
diff --git a/spec/javascripts/diffs/components/tree_list_spec.js b/spec/javascripts/diffs/components/tree_list_spec.js
index 08b0b4f9e45..c5ef48a81e9 100644
--- a/spec/javascripts/diffs/components/tree_list_spec.js
+++ b/spec/javascripts/diffs/components/tree_list_spec.js
@@ -83,17 +83,6 @@ describe('Diffs tree list component', () => {
       expect(vm.$el.querySelectorAll('.file-row')[1].textContent).toContain('app');
     });
 
-    it('filters tree list to blobs matching search', done => {
-      vm.search = 'app/index';
-
-      vm.$nextTick(() => {
-        expect(vm.$el.querySelectorAll('.file-row').length).toBe(1);
-        expect(vm.$el.querySelectorAll('.file-row')[0].textContent).toContain('index.js');
-
-        done();
-      });
-    });
-
     it('calls toggleTreeOpen when clicking folder', () => {
       spyOn(vm.$store, 'dispatch').and.stub();
 
@@ -130,14 +119,4 @@ describe('Diffs tree list component', () => {
       });
     });
   });
-
-  describe('clearSearch', () => {
-    it('resets search', () => {
-      vm.search = 'test';
-
-      vm.$el.querySelector('.tree-list-clear-icon').click();
-
-      expect(vm.search).toBe('');
-    });
-  });
 });
diff --git a/spec/javascripts/diffs/store/getters_spec.js b/spec/javascripts/diffs/store/getters_spec.js
index 190ca1230ca..4f69dc92ab8 100644
--- a/spec/javascripts/diffs/store/getters_spec.js
+++ b/spec/javascripts/diffs/store/getters_spec.js
@@ -242,7 +242,11 @@ describe('Diffs Module Getters', () => {
         },
       };
 
-      expect(getters.allBlobs(localState)).toEqual([
+      expect(
+        getters.allBlobs(localState, {
+          flatBlobsList: getters.flatBlobsList(localState),
+        }),
+      ).toEqual([
         {
           isHeader: true,
           path: '/',
diff --git a/spec/javascripts/ide/components/ide_spec.js b/spec/javascripts/ide/components/ide_spec.js
index 55f40be0e4e..dc5790f6562 100644
--- a/spec/javascripts/ide/components/ide_spec.js
+++ b/spec/javascripts/ide/components/ide_spec.js
@@ -1,5 +1,4 @@
 import Vue from 'vue';
-import Mousetrap from 'mousetrap';
 import store from '~/ide/stores';
 import ide from '~/ide/components/ide.vue';
 import { createComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
@@ -72,73 +71,6 @@ describe('ide component', () => {
     });
   });
 
-  describe('file finder', () => {
-    beforeEach(done => {
-      spyOn(vm, 'toggleFileFinder');
-
-      vm.$store.state.fileFindVisible = true;
-
-      vm.$nextTick(done);
-    });
-
-    it('calls toggleFileFinder on `t` key press', done => {
-      Mousetrap.trigger('t');
-
-      vm.$nextTick()
-        .then(() => {
-          expect(vm.toggleFileFinder).toHaveBeenCalled();
-        })
-        .then(done)
-        .catch(done.fail);
-    });
-
-    it('calls toggleFileFinder on `command+p` key press', done => {
-      Mousetrap.trigger('command+p');
-
-      vm.$nextTick()
-        .then(() => {
-          expect(vm.toggleFileFinder).toHaveBeenCalled();
-        })
-        .then(done)
-        .catch(done.fail);
-    });
-
-    it('calls toggleFileFinder on `ctrl+p` key press', done => {
-      Mousetrap.trigger('ctrl+p');
-
-      vm.$nextTick()
-        .then(() => {
-          expect(vm.toggleFileFinder).toHaveBeenCalled();
-        })
-        .then(done)
-        .catch(done.fail);
-    });
-
-    it('always allows `command+p` to trigger toggleFileFinder', () => {
-      expect(
-        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 'command+p'),
-      ).toBe(false);
-    });
-
-    it('always allows `ctrl+p` to trigger toggleFileFinder', () => {
-      expect(
-        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 'ctrl+p'),
-      ).toBe(false);
-    });
-
-    it('onlys handles `t` when focused in input-field', () => {
-      expect(
-        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 't'),
-      ).toBe(true);
-    });
-
-    it('stops callback in monaco editor', () => {
-      setFixtures('<div class="inputarea"></div>');
-
-      expect(vm.mousetrapStopCallback(null, document.querySelector('.inputarea'), 't')).toBe(true);
-    });
-  });
-
   it('shows error message when set', done => {
     expect(vm.$el.querySelector('.flash-container')).toBe(null);
 
diff --git a/spec/javascripts/ide/components/file_finder/index_spec.js b/spec/javascripts/vue_shared/components/file_finder/index_spec.js
index 15ef8c31f91..bae4741f652 100644
--- a/spec/javascripts/ide/components/file_finder/index_spec.js
+++ b/spec/javascripts/vue_shared/components/file_finder/index_spec.js
@@ -1,54 +1,51 @@
 import Vue from 'vue';
-import store from '~/ide/stores';
-import FindFileComponent from '~/ide/components/file_finder/index.vue';
+import Mousetrap from 'mousetrap';
+import FindFileComponent from '~/vue_shared/components/file_finder/index.vue';
 import { UP_KEY_CODE, DOWN_KEY_CODE, ENTER_KEY_CODE, ESC_KEY_CODE } from '~/lib/utils/keycodes';
-import router from '~/ide/ide_router';
-import { file, resetStore } from '../../helpers';
-import { mountComponentWithStore } from '../../../helpers/vue_mount_component_helper';
+import { file } from 'spec/ide/helpers';
+import timeoutPromise from 'spec/helpers/set_timeout_promise_helper';
 
-describe('IDE File finder item spec', () => {
+describe('File finder item spec', () => {
   const Component = Vue.extend(FindFileComponent);
   let vm;
 
-  beforeEach(done => {
-    setFixtures('<div id="app"></div>');
-
-    vm = mountComponentWithStore(Component, {
-      store,
-      el: '#app',
-      props: {
-        index: 0,
+  function createComponent(props) {
+    vm = new Component({
+      propsData: {
+        files: [],
+        visible: true,
+        loading: false,
+        ...props,
       },
     });
 
-    setTimeout(done);
+    vm.$mount('#app');
+  }
+
+  beforeEach(() => {
+    setFixtures('<div id="app"></div>');
   });
 
   afterEach(() => {
     vm.$destroy();
-
-    resetStore(vm.$store);
   });
 
   describe('with entries', () => {
     beforeEach(done => {
-      Vue.set(vm.$store.state.entries, 'folder', {
-        ...file('folder'),
-        path: 'folder',
-        type: 'folder',
-      });
-
-      Vue.set(vm.$store.state.entries, 'index.js', {
-        ...file('index.js'),
-        path: 'index.js',
-        type: 'blob',
-        url: '/index.jsurl',
-      });
-
-      Vue.set(vm.$store.state.entries, 'component.js', {
-        ...file('component.js'),
-        path: 'component.js',
-        type: 'blob',
+      createComponent({
+        files: [
+          {
+            ...file('index.js'),
+            path: 'index.js',
+            type: 'blob',
+            url: '/index.jsurl',
+          },
+          {
+            ...file('component.js'),
+            path: 'component.js',
+            type: 'blob',
+          },
+        ],
       });
 
       setTimeout(done);
@@ -56,13 +53,14 @@ describe('IDE File finder item spec', () => {
 
     it('renders list of blobs', () => {
       expect(vm.$el.textContent).toContain('index.js');
+      expect(vm.$el.textContent).toContain('component.js');
       expect(vm.$el.textContent).not.toContain('folder');
     });
 
     it('filters entries', done => {
       vm.searchText = 'index';
 
-      vm.$nextTick(() => {
+      setTimeout(() => {
         expect(vm.$el.textContent).toContain('index.js');
         expect(vm.$el.textContent).not.toContain('component.js');
 
@@ -73,8 +71,8 @@ describe('IDE File finder item spec', () => {
     it('shows clear button when searchText is not empty', done => {
       vm.searchText = 'index';
 
-      vm.$nextTick(() => {
-        expect(vm.$el.querySelector('.dropdown-input-clear').classList).toContain('show');
+      setTimeout(() => {
+        expect(vm.$el.querySelector('.dropdown-input').classList).toContain('has-value');
         expect(vm.$el.querySelector('.dropdown-input-search').classList).toContain('hidden');
 
         done();
@@ -84,11 +82,11 @@ describe('IDE File finder item spec', () => {
     it('clear button resets searchText', done => {
       vm.searchText = 'index';
 
-      vm.$nextTick()
+      timeoutPromise()
         .then(() => {
           vm.$el.querySelector('.dropdown-input-clear').click();
         })
-        .then(vm.$nextTick)
+        .then(timeoutPromise)
         .then(() => {
           expect(vm.searchText).toBe('');
         })
@@ -100,11 +98,11 @@ describe('IDE File finder item spec', () => {
       spyOn(vm.$refs.searchInput, 'focus');
       vm.searchText = 'index';
 
-      vm.$nextTick()
+      timeoutPromise()
         .then(() => {
           vm.$el.querySelector('.dropdown-input-clear').click();
         })
-        .then(vm.$nextTick)
+        .then(timeoutPromise)
         .then(() => {
           expect(vm.$refs.searchInput.focus).toHaveBeenCalled();
         })
@@ -116,7 +114,7 @@ describe('IDE File finder item spec', () => {
       it('returns 1 when no filtered entries exist', done => {
         vm.searchText = 'testing 123';
 
-        vm.$nextTick(() => {
+        setTimeout(() => {
           expect(vm.listShowCount).toBe(1);
 
           done();
@@ -136,7 +134,7 @@ describe('IDE File finder item spec', () => {
       it('returns 33 when entries dont exist', done => {
         vm.searchText = 'testing 123';
 
-        vm.$nextTick(() => {
+        setTimeout(() => {
           expect(vm.listHeight).toBe(33);
 
           done();
@@ -148,7 +146,7 @@ describe('IDE File finder item spec', () => {
       it('returns length of filtered blobs', done => {
         vm.searchText = 'index';
 
-        vm.$nextTick(() => {
+        setTimeout(() => {
           expect(vm.filteredBlobsLength).toBe(1);
 
           done();
@@ -162,7 +160,7 @@ describe('IDE File finder item spec', () => {
           vm.focusedIndex = 1;
           vm.searchText = 'test';
 
-          vm.$nextTick(() => {
+          setTimeout(() => {
             expect(vm.focusedIndex).toBe(0);
 
             done();
@@ -170,16 +168,16 @@ describe('IDE File finder item spec', () => {
         });
       });
 
-      describe('fileFindVisible', () => {
+      describe('visible', () => {
         it('returns searchText when false', done => {
           vm.searchText = 'test';
-          vm.$store.state.fileFindVisible = true;
+          vm.visible = true;
 
-          vm.$nextTick()
+          timeoutPromise()
             .then(() => {
-              vm.$store.state.fileFindVisible = false;
+              vm.visible = false;
             })
-            .then(vm.$nextTick)
+            .then(timeoutPromise)
             .then(() => {
               expect(vm.searchText).toBe('');
             })
@@ -191,20 +189,19 @@ describe('IDE File finder item spec', () => {
 
     describe('openFile', () => {
       beforeEach(() => {
-        spyOn(router, 'push');
-        spyOn(vm, 'toggleFileFinder');
+        spyOn(vm, '$emit');
       });
 
       it('closes file finder', () => {
-        vm.openFile(vm.$store.state.entries['index.js']);
+        vm.openFile(vm.files[0]);
 
-        expect(vm.toggleFileFinder).toHaveBeenCalled();
+        expect(vm.$emit).toHaveBeenCalledWith('toggle', false);
       });
 
       it('pushes to router', () => {
-        vm.openFile(vm.$store.state.entries['index.js']);
+        vm.openFile(vm.files[0]);
 
-        expect(router.push).toHaveBeenCalledWith('/project/index.jsurl');
+        expect(vm.$emit).toHaveBeenCalledWith('click', vm.files[0]);
       });
     });
 
@@ -217,8 +214,8 @@ describe('IDE File finder item spec', () => {
 
         vm.$refs.searchInput.dispatchEvent(event);
 
-        vm.$nextTick(() => {
-          expect(vm.openFile).toHaveBeenCalledWith(vm.$store.state.entries['index.js']);
+        setTimeout(() => {
+          expect(vm.openFile).toHaveBeenCalledWith(vm.files[0]);
 
           done();
         });
@@ -228,12 +225,12 @@ describe('IDE File finder item spec', () => {
         const event = new CustomEvent('keyup');
         event.keyCode = ESC_KEY_CODE;
 
-        spyOn(vm, 'toggleFileFinder');
+        spyOn(vm, '$emit');
 
         vm.$refs.searchInput.dispatchEvent(event);
 
-        vm.$nextTick(() => {
-          expect(vm.toggleFileFinder).toHaveBeenCalled();
+        setTimeout(() => {
+          expect(vm.$emit).toHaveBeenCalledWith('toggle', false);
 
           done();
         });
@@ -287,18 +284,85 @@ describe('IDE File finder item spec', () => {
   });
 
   describe('without entries', () => {
-    it('renders loading text when loading', done => {
-      store.state.loading = true;
-
-      vm.$nextTick(() => {
-        expect(vm.$el.textContent).toContain('Loading...');
-
-        done();
+    it('renders loading text when loading', () => {
+      createComponent({
+        loading: true,
       });
+
+      expect(vm.$el.textContent).toContain('Loading...');
     });
 
     it('renders no files text', () => {
+      createComponent();
+
       expect(vm.$el.textContent).toContain('No files found.');
     });
   });
+
+  describe('keyboard shortcuts', () => {
+    beforeEach(done => {
+      createComponent();
+
+      spyOn(vm, 'toggle');
+
+      vm.$nextTick(done);
+    });
+
+    it('calls toggle on `t` key press', done => {
+      Mousetrap.trigger('t');
+
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.toggle).toHaveBeenCalled();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('calls toggle on `command+p` key press', done => {
+      Mousetrap.trigger('command+p');
+
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.toggle).toHaveBeenCalled();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('calls toggle on `ctrl+p` key press', done => {
+      Mousetrap.trigger('ctrl+p');
+
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.toggle).toHaveBeenCalled();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('always allows `command+p` to trigger toggle', () => {
+      expect(
+        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 'command+p'),
+      ).toBe(false);
+    });
+
+    it('always allows `ctrl+p` to trigger toggle', () => {
+      expect(
+        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 'ctrl+p'),
+      ).toBe(false);
+    });
+
+    it('onlys handles `t` when focused in input-field', () => {
+      expect(
+        vm.mousetrapStopCallback(null, vm.$el.querySelector('.dropdown-input-field'), 't'),
+      ).toBe(true);
+    });
+
+    it('stops callback in monaco editor', () => {
+      setFixtures('<div class="inputarea"></div>');
+
+      expect(vm.mousetrapStopCallback(null, document.querySelector('.inputarea'), 't')).toBe(true);
+    });
+  });
 });
diff --git a/spec/javascripts/ide/components/file_finder/item_spec.js b/spec/javascripts/vue_shared/components/file_finder/item_spec.js
index 0f1116c6912..c1511643a9d 100644
--- a/spec/javascripts/ide/components/file_finder/item_spec.js
+++ b/spec/javascripts/vue_shared/components/file_finder/item_spec.js
@@ -1,9 +1,9 @@
 import Vue from 'vue';
-import ItemComponent from '~/ide/components/file_finder/item.vue';
-import { file } from '../../helpers';
+import ItemComponent from '~/vue_shared/components/file_finder/item.vue';
+import { file } from 'spec/ide/helpers';
 import createComponent from '../../../helpers/vue_mount_component_helper';
 
-describe('IDE File finder item spec', () => {
+describe('File finder item spec', () => {
   const Component = Vue.extend(ItemComponent);
   let vm;
   let localFile;