Add latest changes from gitlab-org/gitlab@master

22 files changed, 1012 insertions, 49 deletions

diff --git a/app/assets/javascripts/blob/components/blob_content.vue b/app/assets/javascripts/blob/components/blob_content.vue
index 2639a099093..7d5d48cfc31 100644
--- a/app/assets/javascripts/blob/components/blob_content.vue
+++ b/app/assets/javascripts/blob/components/blob_content.vue
@@ -45,7 +45,13 @@ export default {
 
     <template v-else>
       <blob-content-error v-if="viewerError" :viewer-error="viewerError" />
-      <component :is="viewer" v-else ref="contentViewer" :content="content" />
+      <component
+        :is="viewer"
+        v-else
+        ref="contentViewer"
+        :content="content"
+        :type="activeViewer.fileType"
+      />
     </template>
   </div>
 </template>
diff --git a/app/assets/javascripts/blob/viewer/index.js b/app/assets/javascripts/blob/viewer/index.js
index 742404da46c..3ac419557eb 100644
--- a/app/assets/javascripts/blob/viewer/index.js
+++ b/app/assets/javascripts/blob/viewer/index.js
@@ -5,10 +5,43 @@ import { handleLocationHash } from '../../lib/utils/common_utils';
 import axios from '../../lib/utils/axios_utils';
 import { __ } from '~/locale';
 
+const loadRichBlobViewer = type => {
+  switch (type) {
+    case 'balsamiq':
+      return import(/* webpackChunkName: 'balsamiq_viewer' */ '../balsamiq_viewer');
+    case 'notebook':
+      return import(/* webpackChunkName: 'notebook_viewer' */ '../notebook_viewer');
+    case 'openapi':
+      return import(/* webpackChunkName: 'openapi_viewer' */ '../openapi_viewer');
+    case 'pdf':
+      return import(/* webpackChunkName: 'pdf_viewer' */ '../pdf_viewer');
+    case 'sketch':
+      return import(/* webpackChunkName: 'sketch_viewer' */ '../sketch_viewer');
+    case 'stl':
+      return import(/* webpackChunkName: 'stl_viewer' */ '../stl_viewer');
+    default:
+      return Promise.resolve();
+  }
+};
+
+export const handleBlobRichViewer = (viewer, type) => {
+  if (!viewer || !type) return;
+
+  loadRichBlobViewer(type)
+    .then(module => module?.default(viewer))
+    .catch(error => {
+      Flash(__('Error loading file viewer.'));
+      throw error;
+    });
+};
+
 export default class BlobViewer {
   constructor() {
+    const viewer = document.querySelector('.blob-viewer[data-type="rich"]');
+    const type = viewer?.dataset?.richType;
     BlobViewer.initAuxiliaryViewer();
-    BlobViewer.initRichViewer();
+
+    handleBlobRichViewer(viewer, type);
 
     this.initMainViewers();
   }
@@ -20,42 +53,6 @@ export default class BlobViewer {
     BlobViewer.loadViewer(auxiliaryViewer);
   }
 
-  static initRichViewer() {
-    const viewer = document.querySelector('.blob-viewer[data-type="rich"]');
-    if (!viewer || !viewer.dataset.richType) return;
-
-    const initViewer = promise =>
-      promise
-        .then(module => module.default(viewer))
-        .catch(error => {
-          Flash(__('Error loading file viewer.'));
-          throw error;
-        });
-
-    switch (viewer.dataset.richType) {
-      case 'balsamiq':
-        initViewer(import(/* webpackChunkName: 'balsamiq_viewer' */ '../balsamiq_viewer'));
-        break;
-      case 'notebook':
-        initViewer(import(/* webpackChunkName: 'notebook_viewer' */ '../notebook_viewer'));
-        break;
-      case 'openapi':
-        initViewer(import(/* webpackChunkName: 'openapi_viewer' */ '../openapi_viewer'));
-        break;
-      case 'pdf':
-        initViewer(import(/* webpackChunkName: 'pdf_viewer' */ '../pdf_viewer'));
-        break;
-      case 'sketch':
-        initViewer(import(/* webpackChunkName: 'sketch_viewer' */ '../sketch_viewer'));
-        break;
-      case 'stl':
-        initViewer(import(/* webpackChunkName: 'stl_viewer' */ '../stl_viewer'));
-        break;
-      default:
-        break;
-    }
-  }
-
   initMainViewers() {
     this.$fileHolder = $('.file-holder');
     if (!this.$fileHolder.length) return;
diff --git a/app/assets/javascripts/vue_shared/components/blob_viewers/mixins.js b/app/assets/javascripts/vue_shared/components/blob_viewers/mixins.js
index 582213ee8d3..27f1a4f75d5 100644
--- a/app/assets/javascripts/vue_shared/components/blob_viewers/mixins.js
+++ b/app/assets/javascripts/vue_shared/components/blob_viewers/mixins.js
@@ -4,5 +4,9 @@ export default {
       type: String,
       required: true,
     },
+    type: {
+      type: String,
+      required: true,
+    },
   },
 };
diff --git a/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue b/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
index b3a1df8f303..afbfb1e0ee2 100644
--- a/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
+++ b/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
@@ -1,10 +1,14 @@
 <script>
 import ViewerMixin from './mixins';
+import { handleBlobRichViewer } from '~/blob/viewer';
 
 export default {
   mixins: [ViewerMixin],
+  mounted() {
+    handleBlobRichViewer(this.$refs.content, this.type);
+  },
 };
 </script>
 <template>
-  <div v-html="content"></div>
+  <div ref="content" v-html="content"></div>
 </template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_regular_label.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_regular_label.vue
index f519f90445e..839117becd9 100644
--- a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_regular_label.vue
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_regular_label.vue
@@ -27,7 +27,12 @@ export default {
     <span :style="labelStyle" class="badge color-label">
       {{ label.title }}
     </span>
-    <gl-tooltip :target="() => $refs.regularLabelRef" placement="top" boundary="viewport">
+    <gl-tooltip
+      v-if="label.description"
+      :target="() => $refs.regularLabelRef"
+      placement="top"
+      boundary="viewport"
+    >
       {{ label.description }}
     </gl-tooltip>
   </a>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_scoped_label.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_scoped_label.vue
index ad5a86de166..94587e1cbab 100644
--- a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_scoped_label.vue
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_scoped_label.vue
@@ -33,7 +33,12 @@ export default {
       <span :ref="`labelTitleRef`" :style="labelStyle" class="badge color-label label">
         {{ label.title }}
       </span>
-      <gl-tooltip :target="() => $refs.labelTitleRef" placement="top" boundary="viewport">
+      <gl-tooltip
+        v-if="label.description"
+        :target="() => $refs.labelTitleRef"
+        placement="top"
+        boundary="viewport"
+      >
         <span class="font-weight-bold scoped-label-tooltip-title">{{ __('Scoped label') }}</span
         ><br />
         {{ label.description }}
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_button.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_button.vue
new file mode 100644
index 00000000000..b9c611d2764
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_button.vue
@@ -0,0 +1,21 @@
+<script>
+import { mapGetters } from 'vuex';
+import { GlButton, GlIcon } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlButton,
+    GlIcon,
+  },
+  computed: {
+    ...mapGetters(['dropdownButtonText']),
+  },
+};
+</script>
+
+<template>
+  <gl-button class="labels-select-dropdown-button w-100 text-left">
+    <span class="dropdown-toggle-text">{{ dropdownButtonText }}</span>
+    <gl-icon name="chevron-down" class="pull-right" />
+  </gl-button>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents.vue
new file mode 100644
index 00000000000..ef8218b5135
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents.vue
@@ -0,0 +1,30 @@
+<script>
+import { mapState } from 'vuex';
+
+import DropdownContentsLabelsView from './dropdown_contents_labels_view.vue';
+import DropdownContentsCreateView from './dropdown_contents_create_view.vue';
+
+export default {
+  components: {
+    DropdownContentsLabelsView,
+    DropdownContentsCreateView,
+  },
+  computed: {
+    ...mapState(['showDropdownContentsCreateView']),
+    dropdownContentsView() {
+      if (this.showDropdownContentsCreateView) {
+        return 'dropdown-contents-create-view';
+      }
+      return 'dropdown-contents-labels-view';
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    class="labels-select-dropdown-contents w-100 mt-1 mb-3 py-2 rounded-top rounded-bottom position-absolute"
+  >
+    <component :is="dropdownContentsView" />
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_create_view.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_create_view.vue
new file mode 100644
index 00000000000..285a0fe9ffb
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_create_view.vue
@@ -0,0 +1,124 @@
+<script>
+import { mapState, mapActions } from 'vuex';
+import {
+  GlTooltipDirective,
+  GlButton,
+  GlIcon,
+  GlFormInput,
+  GlLink,
+  GlLoadingIcon,
+} from '@gitlab/ui';
+
+export default {
+  components: {
+    GlButton,
+    GlIcon,
+    GlFormInput,
+    GlLink,
+    GlLoadingIcon,
+  },
+  directives: {
+    GlTooltip: GlTooltipDirective,
+  },
+  data() {
+    return {
+      labelTitle: '',
+      selectedColor: '',
+    };
+  },
+  computed: {
+    ...mapState(['labelsCreateTitle', 'labelCreateInProgress']),
+    disableCreate() {
+      return !this.labelTitle.length || !this.selectedColor.length || this.labelCreateInProgress;
+    },
+    suggestedColors() {
+      const colorsMap = gon.suggested_label_colors;
+      return Object.keys(colorsMap).map(color => ({ [color]: colorsMap[color] }));
+    },
+  },
+  methods: {
+    ...mapActions(['toggleDropdownContents', 'toggleDropdownContentsCreateView', 'createLabel']),
+    getColorCode(color) {
+      return Object.keys(color).pop();
+    },
+    getColorName(color) {
+      return Object.values(color).pop();
+    },
+    handleColorClick(color) {
+      this.selectedColor = this.getColorCode(color);
+    },
+    handleCreateClick() {
+      this.createLabel({
+        title: this.labelTitle,
+        color: this.selectedColor,
+      });
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="labels-select-contents-create">
+    <div class="dropdown-title d-flex align-items-center pt-0 pb-2">
+      <gl-button
+        :aria-label="__('Go back')"
+        variant="link"
+        size="sm"
+        class="dropdown-header-button p-0"
+        @click="toggleDropdownContentsCreateView"
+      >
+        <gl-icon name="arrow-left" />
+      </gl-button>
+      <span class="flex-grow-1">{{ labelsCreateTitle }}</span>
+      <gl-button
+        :aria-label="__('Close')"
+        variant="link"
+        size="sm"
+        class="dropdown-header-button p-0"
+        @click="toggleDropdownContents"
+      >
+        <gl-icon name="close" />
+      </gl-button>
+    </div>
+    <div class="dropdown-input">
+      <gl-form-input
+        v-model.trim="labelTitle"
+        :placeholder="__('Name new label')"
+        :autofocus="true"
+      />
+    </div>
+    <div class="dropdown-content px-2">
+      <div class="suggest-colors suggest-colors-dropdown mt-0 mb-2">
+        <gl-link
+          v-for="(color, index) in suggestedColors"
+          :key="index"
+          v-gl-tooltip:tooltipcontainer
+          :style="{ backgroundColor: getColorCode(color) }"
+          :title="getColorName(color)"
+          @click.prevent="handleColorClick(color)"
+        />
+      </div>
+      <div class="color-input-container d-flex">
+        <span
+          class="dropdown-label-color-preview position-relative position-relative d-inline-block"
+          :style="{ backgroundColor: selectedColor }"
+        ></span>
+        <gl-form-input v-model.trim="selectedColor" :placeholder="__('Use custom color #FF0000')" />
+      </div>
+    </div>
+    <div class="dropdown-actions clearfix pt-2 px-2">
+      <gl-button
+        :disabled="disableCreate"
+        variant="primary"
+        class="pull-left d-flex align-items-center"
+        @click="handleCreateClick"
+      >
+        <gl-loading-icon v-show="labelCreateInProgress" :inline="true" class="mr-1" />
+        {{ __('Create') }}
+      </gl-button>
+      <gl-button class="pull-right" @click="toggleDropdownContentsCreateView">
+        {{ __('Cancel') }}
+      </gl-button>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_labels_view.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_labels_view.vue
new file mode 100644
index 00000000000..7ec420fa908
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_labels_view.vue
@@ -0,0 +1,178 @@
+<script>
+import { mapState, mapGetters, mapActions } from 'vuex';
+import { GlLoadingIcon, GlButton, GlIcon, GlSearchBoxByType, GlLink } from '@gitlab/ui';
+
+import { UP_KEY_CODE, DOWN_KEY_CODE, ENTER_KEY_CODE, ESC_KEY_CODE } from '~/lib/utils/keycodes';
+
+export default {
+  components: {
+    GlLoadingIcon,
+    GlButton,
+    GlIcon,
+    GlSearchBoxByType,
+    GlLink,
+  },
+  data() {
+    return {
+      searchKey: '',
+      currentHighlightItem: -1,
+    };
+  },
+  computed: {
+    ...mapState([
+      'labelsManagePath',
+      'labels',
+      'labelsFetchInProgress',
+      'labelsListTitle',
+      'footerCreateLabelTitle',
+      'footerManageLabelTitle',
+    ]),
+    ...mapGetters(['selectedLabelsList']),
+    visibleLabels() {
+      if (this.searchKey) {
+        return this.labels.filter(label =>
+          label.title.toLowerCase().includes(this.searchKey.toLowerCase()),
+        );
+      }
+      return this.labels;
+    },
+  },
+  watch: {
+    searchKey(value) {
+      // When there is search string present
+      // and there are matching results,
+      // highlight first item by default.
+      if (value && this.visibleLabels.length) {
+        this.currentHighlightItem = 0;
+      }
+    },
+  },
+  mounted() {
+    this.fetchLabels();
+  },
+  methods: {
+    ...mapActions([
+      'toggleDropdownContents',
+      'toggleDropdownContentsCreateView',
+      'fetchLabels',
+      'updateSelectedLabels',
+    ]),
+    getDropdownLabelBoxStyle(label) {
+      return {
+        backgroundColor: label.color,
+      };
+    },
+    isLabelSelected(label) {
+      return this.selectedLabelsList.includes(label.id);
+    },
+    /**
+     * This method scrolls item from dropdown into
+     * the view if it is off the viewable area of the
+     * container.
+     */
+    scrollIntoViewIfNeeded() {
+      const highlightedLabel = this.$refs.labelsListContainer.querySelector('.is-focused');
+
+      if (highlightedLabel) {
+        const rect = highlightedLabel.getBoundingClientRect();
+        if (rect.bottom > this.$refs.labelsListContainer.clientHeight) {
+          highlightedLabel.scrollIntoView(false);
+        }
+        if (rect.top < 0) {
+          highlightedLabel.scrollIntoView();
+        }
+      }
+    },
+    /**
+     * This method enables keyboard navigation support for
+     * the dropdown.
+     */
+    handleKeyDown(e) {
+      if (e.keyCode === UP_KEY_CODE && this.currentHighlightItem > 0) {
+        this.currentHighlightItem -= 1;
+      } else if (
+        e.keyCode === DOWN_KEY_CODE &&
+        this.currentHighlightItem < this.visibleLabels.length - 1
+      ) {
+        this.currentHighlightItem += 1;
+      } else if (e.keyCode === ENTER_KEY_CODE && this.currentHighlightItem > -1) {
+        this.updateSelectedLabels([this.visibleLabels[this.currentHighlightItem]]);
+      } else if (e.keyCode === ESC_KEY_CODE) {
+        this.toggleDropdownContents();
+      }
+
+      if (e.keyCode !== ESC_KEY_CODE) {
+        // Scroll the list only after highlighting
+        // styles are rendered completely.
+        this.$nextTick(() => {
+          this.scrollIntoViewIfNeeded();
+        });
+      }
+    },
+    handleLabelClick(label) {
+      this.updateSelectedLabels([label]);
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="labels-select-contents-list" @keydown="handleKeyDown">
+    <gl-loading-icon
+      v-if="labelsFetchInProgress"
+      class="labels-fetch-loading position-absolute d-flex align-items-center w-100 h-100"
+      size="md"
+    />
+    <div class="dropdown-title d-flex align-items-center pt-0 pb-2">
+      <span class="flex-grow-1">{{ labelsListTitle }}</span>
+      <gl-button
+        :aria-label="__('Close')"
+        variant="link"
+        size="sm"
+        class="dropdown-header-button p-0"
+        @click="toggleDropdownContents"
+      >
+        <gl-icon name="close" />
+      </gl-button>
+    </div>
+    <div class="dropdown-input">
+      <gl-search-box-by-type v-model="searchKey" :autofocus="true" />
+    </div>
+    <div v-if="!labelsFetchInProgress" ref="labelsListContainer" class="dropdown-content">
+      <ul class="list-unstyled mb-0">
+        <li v-for="(label, index) in visibleLabels" :key="label.id" class="d-block text-left">
+          <gl-link
+            class="d-flex align-items-baseline text-break-word label-item"
+            :class="{ 'is-focused': index === currentHighlightItem }"
+            @click="handleLabelClick(label)"
+          >
+            <gl-icon v-show="label.set" name="mobile-issue-close" class="mr-2 align-self-center" />
+            <span v-show="!label.set" class="mr-3 pr-2"></span>
+            <span class="dropdown-label-box" :style="getDropdownLabelBoxStyle(label)"></span>
+            <span>{{ label.title }}</span>
+          </gl-link>
+        </li>
+        <li v-if="!visibleLabels.length" class="p-2 text-center">
+          {{ __('No matching results') }}
+        </li>
+      </ul>
+    </div>
+    <div class="dropdown-footer">
+      <ul class="list-unstyled">
+        <li>
+          <gl-button
+            variant="link"
+            class="d-flex w-100 flex-row text-break-word label-item"
+            @click="toggleDropdownContentsCreateView"
+            >{{ footerCreateLabelTitle }}</gl-button
+          >
+        </li>
+        <li>
+          <gl-link :href="labelsManagePath" class="d-flex flex-row text-break-word label-item">
+            {{ footerManageLabelTitle }}
+          </gl-link>
+        </li>
+      </ul>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_title.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_title.vue
new file mode 100644
index 00000000000..57f7962dfe1
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_title.vue
@@ -0,0 +1,39 @@
+<script>
+import { mapState, mapActions } from 'vuex';
+import { GlButton, GlLoadingIcon } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlButton,
+    GlLoadingIcon,
+  },
+  props: {
+    labelsSelectInProgress: {
+      type: Boolean,
+      required: true,
+    },
+  },
+  computed: {
+    ...mapState(['allowLabelEdit', 'labelsFetchInProgress']),
+  },
+  methods: {
+    ...mapActions(['toggleDropdownContents']),
+  },
+};
+</script>
+
+<template>
+  <div class="title hide-collapsed append-bottom-10">
+    {{ __('Labels') }}
+    <template v-if="allowLabelEdit">
+      <gl-loading-icon v-show="labelsSelectInProgress" inline />
+      <gl-button
+        variant="link"
+        class="pull-right js-sidebar-dropdown-toggle"
+        data-qa-selector="labels_edit_button"
+        @click="toggleDropdownContents"
+        >{{ __('Edit') }}</gl-button
+      >
+    </template>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_value.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_value.vue
new file mode 100644
index 00000000000..695af775750
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_value.vue
@@ -0,0 +1,53 @@
+<script>
+import { mapState } from 'vuex';
+import { GlLabel } from '@gitlab/ui';
+
+import { isScopedLabel } from '~/lib/utils/common_utils';
+
+export default {
+  components: {
+    GlLabel,
+  },
+  computed: {
+    ...mapState([
+      'selectedLabels',
+      'allowScopedLabels',
+      'labelsFilterBasePath',
+      'scopedLabelsDocumentationPath',
+    ]),
+  },
+  methods: {
+    labelFilterUrl(label) {
+      return `${this.labelsFilterBasePath}?label_name[]=${encodeURIComponent(label.title)}`;
+    },
+    scopedLabel(label) {
+      return this.allowScopedLabels && isScopedLabel(label);
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    :class="{
+      'has-labels': selectedLabels.length,
+    }"
+    class="hide-collapsed value issuable-show-labels js-value"
+  >
+    <span v-if="!selectedLabels.length" class="text-secondary">
+      <slot></slot>
+    </span>
+    <template v-for="label in selectedLabels" v-else>
+      <gl-label
+        :key="label.id"
+        :title="label.title"
+        :description="label.description"
+        :background-color="label.color"
+        :target="labelFilterUrl(label)"
+        :scoped="scopedLabel(label)"
+        :scoped-labels-documentation-link="scopedLabelsDocumentationPath"
+        tooltip-placement="top"
+      />
+    </template>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue
new file mode 100644
index 00000000000..b90f441b8ec
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue
@@ -0,0 +1,173 @@
+<script>
+import Vue from 'vue';
+import Vuex, { mapState, mapActions } from 'vuex';
+import { __ } from '~/locale';
+
+import DropdownValueCollapsed from '~/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed.vue';
+
+import labelsSelectModule from './store';
+
+import DropdownTitle from './dropdown_title.vue';
+import DropdownValue from './dropdown_value.vue';
+import DropdownButton from './dropdown_button.vue';
+import DropdownContents from './dropdown_contents.vue';
+
+Vue.use(Vuex);
+
+export default {
+  store: new Vuex.Store(labelsSelectModule()),
+  components: {
+    DropdownTitle,
+    DropdownValue,
+    DropdownButton,
+    DropdownContents,
+    DropdownValueCollapsed,
+  },
+  props: {
+    allowLabelEdit: {
+      type: Boolean,
+      required: true,
+    },
+    allowLabelCreate: {
+      type: Boolean,
+      required: true,
+    },
+    allowScopedLabels: {
+      type: Boolean,
+      required: true,
+    },
+    dropdownOnly: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    selectedLabels: {
+      type: Array,
+      required: false,
+      default: () => [],
+    },
+    labelsSelectInProgress: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    labelsFetchPath: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    labelsManagePath: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    labelsFilterBasePath: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    scopedLabelsDocumentationPath: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    labelsListTitle: {
+      type: String,
+      required: false,
+      default: __('Assign labels'),
+    },
+    labelsCreateTitle: {
+      type: String,
+      required: false,
+      default: __('Create group label'),
+    },
+    footerCreateLabelTitle: {
+      type: String,
+      required: false,
+      default: __('Create group label'),
+    },
+    footerManageLabelTitle: {
+      type: String,
+      required: false,
+      default: __('Manage group labels'),
+    },
+  },
+  computed: {
+    ...mapState(['showDropdownButton', 'showDropdownContents']),
+  },
+  watch: {
+    selectedLabels(selectedLabels) {
+      this.setInitialState({
+        selectedLabels,
+      });
+    },
+  },
+  mounted() {
+    this.setInitialState({
+      dropdownOnly: this.dropdownOnly,
+      allowLabelEdit: this.allowLabelEdit,
+      allowLabelCreate: this.allowLabelCreate,
+      allowScopedLabels: this.allowScopedLabels,
+      selectedLabels: this.selectedLabels,
+      labelsFetchPath: this.labelsFetchPath,
+      labelsManagePath: this.labelsManagePath,
+      labelsFilterBasePath: this.labelsFilterBasePath,
+      scopedLabelsDocumentationPath: this.scopedLabelsDocumentationPath,
+      labelsListTitle: this.labelsListTitle,
+      labelsCreateTitle: this.labelsCreateTitle,
+      footerCreateLabelTitle: this.footerCreateLabelTitle,
+      footerManageLabelTitle: this.footerManageLabelTitle,
+    });
+
+    this.$store.subscribeAction({
+      after: this.handleVuexActionDispatch,
+    });
+  },
+  methods: {
+    ...mapActions(['setInitialState']),
+    /**
+     * This method differentiates between
+     * dispatched actions and calls necessary method.
+     */
+    handleVuexActionDispatch(action, state) {
+      if (
+        action.type === 'toggleDropdownContents' &&
+        !state.showDropdownButton &&
+        !state.showDropdownContents
+      ) {
+        this.handleDropdownClose(state.labels.filter(label => label.touched));
+      }
+    },
+    handleDropdownClose(labels) {
+      // Only emit label updates if there are any labels to update
+      // on UI.
+      if (labels.length) this.$emit('updateSelectedLabels', labels);
+      this.$emit('onDropdownClose');
+    },
+    handleCollapsedValueClick() {
+      this.$emit('toggleCollapse');
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="labels-select-wrapper position-relative">
+    <div v-if="!dropdownOnly">
+      <dropdown-value-collapsed
+        v-if="allowLabelCreate"
+        :labels="selectedLabels"
+        @onValueClick="handleCollapsedValueClick"
+      />
+      <dropdown-title
+        :allow-label-edit="allowLabelEdit"
+        :labels-select-in-progress="labelsSelectInProgress"
+      />
+      <dropdown-value v-show="!showDropdownButton">
+        <slot></slot>
+      </dropdown-value>
+      <dropdown-button v-show="showDropdownButton" />
+      <dropdown-contents v-if="showDropdownButton && showDropdownContents" />
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/actions.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/actions.js
new file mode 100644
index 00000000000..145ec7dc566
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/actions.js
@@ -0,0 +1,61 @@
+import flash from '~/flash';
+import { __ } from '~/locale';
+import axios from '~/lib/utils/axios_utils';
+import * as types from './mutation_types';
+
+export const setInitialState = ({ commit }, props) => commit(types.SET_INITIAL_STATE, props);
+
+export const toggleDropdownButton = ({ commit }) => commit(types.TOGGLE_DROPDOWN_BUTTON);
+export const toggleDropdownContents = ({ commit }) => commit(types.TOGGLE_DROPDOWN_CONTENTS);
+
+export const toggleDropdownContentsCreateView = ({ commit }) =>
+  commit(types.TOGGLE_DROPDOWN_CONTENTS_CREATE_VIEW);
+
+export const requestLabels = ({ commit }) => commit(types.REQUEST_LABELS);
+export const receiveLabelsSuccess = ({ commit }, labels) =>
+  commit(types.RECEIVE_SET_LABELS_SUCCESS, labels);
+export const receiveLabelsFailure = ({ commit }) => {
+  commit(types.RECEIVE_SET_LABELS_FAILURE);
+  flash(__('Error fetching labels.'));
+};
+export const fetchLabels = ({ state, dispatch }) => {
+  dispatch('requestLabels');
+  axios
+    .get(state.labelsFetchPath)
+    .then(({ data }) => {
+      dispatch('receiveLabelsSuccess', data);
+    })
+    .catch(() => dispatch('receiveLabelsFailure'));
+};
+
+export const requestCreateLabel = ({ commit }) => commit(types.REQUEST_CREATE_LABEL);
+export const receiveCreateLabelSuccess = ({ commit }) => commit(types.RECEIVE_CREATE_LABEL_SUCCESS);
+export const receiveCreateLabelFailure = ({ commit }) => {
+  commit(types.RECEIVE_CREATE_LABEL_FAILURE);
+  flash(__('Error creating label.'));
+};
+export const createLabel = ({ state, dispatch }, label) => {
+  dispatch('requestCreateLabel');
+  axios
+    .post(state.labelsManagePath, {
+      label,
+    })
+    .then(({ data }) => {
+      if (data.id) {
+        dispatch('receiveCreateLabelSuccess');
+        dispatch('toggleDropdownContentsCreateView');
+      } else {
+        // eslint-disable-next-line @gitlab/i18n/no-non-i18n-strings
+        throw new Error('Error Creating Label');
+      }
+    })
+    .catch(() => {
+      dispatch('receiveCreateLabelFailure');
+    });
+};
+
+export const updateSelectedLabels = ({ commit }, labels) =>
+  commit(types.UPDATE_SELECTED_LABELS, { labels });
+
+// prevent babel-plugin-rewire from generating an invalid default during karma tests
+export default () => {};
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/getters.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/getters.js
new file mode 100644
index 00000000000..c08a8a8ea58
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/getters.js
@@ -0,0 +1,30 @@
+import { __, s__, sprintf } from '~/locale';
+
+/**
+ * Returns string representing current labels
+ * selection on dropdown button.
+ *
+ * @param {object} state
+ */
+export const dropdownButtonText = state => {
+  const selectedLabels = state.labels.filter(label => label.set);
+  if (!selectedLabels.length) {
+    return __('Label');
+  } else if (selectedLabels.length > 1) {
+    return sprintf(s__('LabelSelect|%{firstLabelName} +%{remainingLabelCount} more'), {
+      firstLabelName: selectedLabels[0].title,
+      remainingLabelCount: selectedLabels.length - 1,
+    });
+  }
+  return selectedLabels[0].title;
+};
+
+/**
+ * Returns array containing only label IDs from
+ * selectedLabels array.
+ * @param {object} state
+ */
+export const selectedLabelsList = state => state.selectedLabels.map(label => label.id);
+
+// prevent babel-plugin-rewire from generating an invalid default during karma tests
+export default () => {};
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/index.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/index.js
new file mode 100644
index 00000000000..5f61cb732c8
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/index.js
@@ -0,0 +1,12 @@
+import * as actions from './actions';
+import * as getters from './getters';
+import mutations from './mutations';
+import state from './state';
+
+export default () => ({
+  namespaced: true,
+  state: state(),
+  actions,
+  getters,
+  mutations,
+});
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutation_types.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutation_types.js
new file mode 100644
index 00000000000..2e044dc3b3c
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutation_types.js
@@ -0,0 +1,20 @@
+export const SET_INITIAL_STATE = 'SET_INITIAL_STATE';
+
+export const REQUEST_LABELS = 'REQUEST_LABELS';
+export const RECEIVE_LABELS_SUCCESS = 'RECEIVE_LABELS_SUCCESS';
+export const RECEIVE_LABELS_FAILURE = 'RECEIVE_LABELS_FAILURE';
+
+export const REQUEST_SET_LABELS = 'REQUEST_SET_LABELS';
+export const RECEIVE_SET_LABELS_SUCCESS = 'RECEIVE_SET_LABELS_SUCCESS';
+export const RECEIVE_SET_LABELS_FAILURE = 'RECEIVE_SET_LABELS_FAILURE';
+
+export const REQUEST_CREATE_LABEL = 'REQUEST_CREATE_LABEL';
+export const RECEIVE_CREATE_LABEL_SUCCESS = 'RECEIVE_CREATE_LABEL_SUCCESS';
+export const RECEIVE_CREATE_LABEL_FAILURE = 'RECEIVE_CREATE_LABEL_FAILURE';
+
+export const TOGGLE_DROPDOWN_BUTTON = 'TOGGLE_DROPDOWN_VISIBILITY';
+export const TOGGLE_DROPDOWN_CONTENTS = 'TOGGLE_DROPDOWN_CONTENTS';
+
+export const UPDATE_SELECTED_LABELS = 'UPDATE_SELECTED_LABELS';
+
+export const TOGGLE_DROPDOWN_CONTENTS_CREATE_VIEW = 'TOGGLE_DROPDOWN_CONTENTS_CREATE_VIEW';
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutations.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutations.js
new file mode 100644
index 00000000000..32a78507e88
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/mutations.js
@@ -0,0 +1,76 @@
+import * as types from './mutation_types';
+
+export default {
+  [types.SET_INITIAL_STATE](state, props) {
+    Object.assign(state, { ...props });
+  },
+
+  [types.TOGGLE_DROPDOWN_BUTTON](state) {
+    state.showDropdownButton = !state.showDropdownButton;
+  },
+
+  [types.TOGGLE_DROPDOWN_CONTENTS](state) {
+    if (!state.dropdownOnly) {
+      state.showDropdownButton = !state.showDropdownButton;
+    }
+    state.showDropdownContents = !state.showDropdownContents;
+    // Ensure that Create View is hidden by default
+    // when dropdown contents are revealed.
+    if (state.showDropdownContents) {
+      state.showDropdownContentsCreateView = false;
+    }
+  },
+
+  [types.TOGGLE_DROPDOWN_CONTENTS_CREATE_VIEW](state) {
+    state.showDropdownContentsCreateView = !state.showDropdownContentsCreateView;
+  },
+
+  [types.REQUEST_LABELS](state) {
+    state.labelsFetchInProgress = true;
+  },
+  [types.RECEIVE_SET_LABELS_SUCCESS](state, labels) {
+    // Iterate over every label and add a `set` prop
+    // to determine whether it is already a part of
+    // selectedLabels array.
+    const selectedLabelIds = state.selectedLabels.map(label => label.id);
+    state.labelsFetchInProgress = false;
+    state.labels = labels.reduce((allLabels, label) => {
+      allLabels.push({
+        ...label,
+        set: selectedLabelIds.includes(label.id),
+      });
+      return allLabels;
+    }, []);
+  },
+  [types.RECEIVE_SET_LABELS_FAILURE](state) {
+    state.labelsFetchInProgress = false;
+  },
+
+  [types.REQUEST_CREATE_LABEL](state) {
+    state.labelCreateInProgress = true;
+  },
+  [types.RECEIVE_CREATE_LABEL_SUCCESS](state) {
+    state.labelCreateInProgress = false;
+  },
+  [types.RECEIVE_CREATE_LABEL_FAILURE](state) {
+    state.labelCreateInProgress = false;
+  },
+
+  [types.UPDATE_SELECTED_LABELS](state, { labels }) {
+    // Iterate over all the labels and update
+    // `set` prop value to represent their current state.
+    const labelIds = labels.map(label => label.id);
+    state.labels = state.labels.reduce((allLabels, label) => {
+      if (labelIds.includes(label.id)) {
+        allLabels.push({
+          ...label,
+          touched: true,
+          set: !label.set,
+        });
+      } else {
+        allLabels.push(label);
+      }
+      return allLabels;
+    }, []);
+  },
+};
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/state.js b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/state.js
new file mode 100644
index 00000000000..ceabc696693
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/store/state.js
@@ -0,0 +1,27 @@
+export default () => ({
+  // Initial Data
+  labels: [],
+  selectedLabels: [],
+  labelsListTitle: '',
+  labelsCreateTitle: '',
+  footerCreateLabelTitle: '',
+  footerManageLabelTitle: '',
+
+  // Paths
+  namespace: '',
+  labelsFetchPath: '',
+  labelsFilterBasePath: '',
+  scopedLabelsDocumentationPath: '#',
+
+  // UI Flags
+  allowLabelCreate: false,
+  allowLabelEdit: false,
+  allowScopedLabels: false,
+  dropdownOnly: false,
+  showDropdownButton: false,
+  showDropdownContents: false,
+  showDropdownContentsCreateView: false,
+  labelsFetchInProgress: false,
+  labelCreateInProgress: false,
+  selectedLabelsUpdated: false,
+});
diff --git a/app/assets/stylesheets/framework/dropdowns.scss b/app/assets/stylesheets/framework/dropdowns.scss
index efcbd63626d..1804f70b37c 100644
--- a/app/assets/stylesheets/framework/dropdowns.scss
+++ b/app/assets/stylesheets/framework/dropdowns.scss
@@ -1019,3 +1019,54 @@ header.header-content .dropdown-menu.frequent-items-dropdown-menu {
     opacity: 0;
   }
 }
+
+.labels-select-wrapper {
+  .labels-select-dropdown-contents {
+    min-height: $dropdown-min-height;
+    max-height: 330px;
+    background-color: $white-light;
+    border: 1px solid $border-color;
+    box-shadow: 0 2px 4px $dropdown-shadow-color;
+    z-index: 2;
+
+    .dropdown-content {
+      height: 135px;
+    }
+  }
+
+  .labels-fetch-loading {
+    top: 0;
+    left: 0;
+    opacity: 0.5;
+    background-color: $white-light;
+    z-index: 1;
+  }
+
+  .dropdown-header-button {
+    .gl-icon {
+      color: $dropdown-title-btn-color;
+
+      &:hover {
+        color: $gl-gray-400;
+      }
+    }
+  }
+
+  .label-item {
+    padding: 8px 20px;
+
+    &:hover,
+    &.is-focused {
+      @include dropdown-item-hover;
+
+      text-decoration: none;
+    }
+  }
+
+  .color-input-container {
+    .dropdown-label-color-preview {
+      border: 1px solid $gray-200;
+      border-right: 0;
+    }
+  }
+}
diff --git a/app/models/snippet.rb b/app/models/snippet.rb
index a927235317c..201cd719ee9 100644
--- a/app/models/snippet.rb
+++ b/app/models/snippet.rb
@@ -281,11 +281,10 @@ class Snippet < ApplicationRecord
   end
 
   def create_repository
-    return if repository_exists?
+    return if repository_exists? && snippet_repository
 
     repository.create_if_not_exists
-
-    track_snippet_repository if repository_exists?
+    track_snippet_repository
   end
 
   def track_snippet_repository
diff --git a/app/services/snippets/update_service.rb b/app/services/snippets/update_service.rb
index c0c0aec2050..c2949ebadbf 100644
--- a/app/services/snippets/update_service.rb
+++ b/app/services/snippets/update_service.rb
@@ -4,6 +4,9 @@ module Snippets
   class UpdateService < Snippets::BaseService
     include SpamCheckMethods
 
+    UpdateError = Class.new(StandardError)
+    CreateRepositoryError = Class.new(StandardError)
+
     def execute(snippet)
       # check that user is allowed to set specified visibility_level
       new_visibility = visibility_level
@@ -20,11 +23,7 @@ module Snippets
       snippet.assign_attributes(params)
       spam_check(snippet, current_user)
 
-      snippet_saved = snippet.with_transaction_returning_status do
-        snippet.save
-      end
-
-      if snippet_saved
+      if save_and_commit(snippet)
         Gitlab::UsageDataCounters::SnippetCounter.count(:update)
 
         ServiceResponse.success(payload: { snippet: snippet } )
@@ -32,5 +31,54 @@ module Snippets
         snippet_error_response(snippet, 400)
       end
     end
+
+    private
+
+    def save_and_commit(snippet)
+      snippet.with_transaction_returning_status do
+        snippet.save.tap do |saved|
+          break false unless saved
+
+          # In order to avoid non migrated snippets scenarios,
+          # if the snippet does not have a repository we created it
+          # We don't need to check if the repository exists
+          # because `create_repository` already handles it
+          if Feature.enabled?(:version_snippets, current_user)
+            create_repository_for(snippet)
+          end
+
+          # If the snippet repository exists we commit always
+          # the changes
+          create_commit(snippet) if snippet.repository_exists?
+        end
+      rescue
+        snippet.errors.add(:base, 'Error updating the snippet')
+
+        false
+      end
+    end
+
+    def create_repository_for(snippet)
+      snippet.create_repository
+
+      raise CreateRepositoryError, 'Repository could not be created' unless snippet.repository_exists?
+    end
+
+    def create_commit(snippet)
+      raise UpdateError unless snippet.snippet_repository
+
+      commit_attrs = {
+        branch_name: 'master',
+        message: 'Update snippet'
+      }
+
+      snippet.snippet_repository.multi_files_action(current_user, snippet_files(snippet), commit_attrs)
+    end
+
+    def snippet_files(snippet)
+      [{ previous_path: snippet.blobs.first&.path,
+         file_path: params[:file_name],
+         content: params[:content] }]
+    end
   end
 end