Added Blob header component

All the dependent components are in place

app/assets/javascripts/blob/components/blob_header.vue

+<script>
+import ViewerSwitcher from './blob_header_viewer_switcher.vue';
+import DefaultActions from './blob_header_default_actions.vue';
+import BlobFilepath from './blob_header_filepath.vue';
+import eventHub from '../event_hub';
+import { RICH_BLOB_VIEWER, SIMPLE_BLOB_VIEWER } from './constants';
+
+export default {
+  components: {
+    ViewerSwitcher,
+    DefaultActions,
+    BlobFilepath,
+  },
+  props: {
+    blob: {
+      type: Object,
+      required: true,
+    },
+    hideDefaultActions: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    hideViewerSwitcher: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+  data() {
+    return {
+      activeViewer: this.blob.richViewer ? RICH_BLOB_VIEWER : SIMPLE_BLOB_VIEWER,
+    };
+  },
+  computed: {
+    showViewerSwitcher() {
+      return !this.hideViewerSwitcher && Boolean(this.blob.simpleViewer && this.blob.richViewer);
+    },
+    showDefaultActions() {
+      return !this.hideDefaultActions;
+    },
+  },
+  created() {
+    if (this.showViewerSwitcher) {
+      eventHub.$on('switch-viewer', this.setActiveViewer);
+    }
+  },
+  beforeDestroy() {
+    if (this.showViewerSwitcher) {
+      eventHub.$off('switch-viewer', this.setActiveViewer);
+    }
+  },
+  methods: {
+    setActiveViewer(viewer) {
+      this.activeViewer = viewer;
+    },
+  },
+};
+</script>
+<template>
+  <div class="js-file-title file-title-flex-parent">
+    <blob-filepath :blob="blob">
+      <template #filepathPrepend>
+        <slot name="prepend"></slot>
+      </template>
+    </blob-filepath>
+
+    <div class="file-actions d-none d-sm-block">
+      <viewer-switcher v-if="showViewerSwitcher" :blob="blob" :active-viewer="activeViewer" />
+
+      <slot name="actions"></slot>
+
+      <default-actions v-if="showDefaultActions" :blob="blob" :active-viewer="activeViewer" />
+    </div>
+  </div>
+</template>

app/assets/javascripts/blob/components/blob_header_default_actions.vue

 <script>
 import { GlButton, GlButtonGroup, GlIcon, GlTooltipDirective } from '@gitlab/ui';
-import { BTN_COPY_CONTENTS_TITLE, BTN_DOWNLOAD_TITLE, BTN_RAW_TITLE } from './constants';
+import {
+  BTN_COPY_CONTENTS_TITLE,
+  BTN_DOWNLOAD_TITLE,
+  BTN_RAW_TITLE,
+  RICH_BLOB_VIEWER,
+  SIMPLE_BLOB_VIEWER,
+} from './constants';
+import eventHub from '../event_hub';
 
 export default {
   components: {
@@ -16,6 +23,11 @@ export default {
       type: Object,
       required: true,
     },
+    activeViewer: {
+      type: String,
+      default: SIMPLE_BLOB_VIEWER,
+      required: false,
+    },
   },
   computed: {
     rawUrl() {
@@ -24,10 +36,13 @@ export default {
     downloadUrl() {
       return `${this.blob.rawPath}?inline=false`;
     },
+    copyDisabled() {
+      return this.activeViewer === RICH_BLOB_VIEWER;
+    },
   },
   methods: {
     requestCopyContents() {
-      this.$emit('copy');
+      eventHub.$emit('copy');
     },
   },
   BTN_COPY_CONTENTS_TITLE,
@@ -41,6 +56,7 @@ export default {
       v-gl-tooltip.hover
       :aria-label="$options.BTN_COPY_CONTENTS_TITLE"
       :title="$options.BTN_COPY_CONTENTS_TITLE"
+      :disabled="copyDisabled"
       @click="requestCopyContents"
     >
       <gl-icon name="copy-to-clipboard" :size="14" />

app/assets/javascripts/blob/components/blob_header_viewer_switcher.vue

@@ -6,6 +6,7 @@ import {
   SIMPLE_BLOB_VIEWER,
   SIMPLE_BLOB_VIEWER_TITLE,
 } from './constants';
+import eventHub from '../event_hub';
 
 export default {
   components: {
@@ -21,25 +22,24 @@ export default {
       type: Object,
       required: true,
     },
+    activeViewer: {
+      type: String,
+      default: SIMPLE_BLOB_VIEWER,
+      required: false,
     },
-  data() {
-    return {
-      viewer: this.blob.richViewer ? RICH_BLOB_VIEWER : SIMPLE_BLOB_VIEWER,
-    };
   },
   computed: {
     isSimpleViewer() {
-      return this.viewer === SIMPLE_BLOB_VIEWER;
+      return this.activeViewer === SIMPLE_BLOB_VIEWER;
     },
     isRichViewer() {
-      return this.viewer === RICH_BLOB_VIEWER;
+      return this.activeViewer === RICH_BLOB_VIEWER;
     },
   },
   methods: {
     switchToViewer(viewer) {
-      if (viewer !== this.viewer) {
-        this.viewer = viewer;
-        this.$emit('switch-viewer', viewer);
+      if (viewer !== this.activeViewer) {
+        eventHub.$emit('switch-viewer', viewer);
       }
     },
   },

app/assets/javascripts/blob/event_hub.js

+import Vue from 'vue';
+
+export default new Vue();

app/assets/javascripts/graphql_shared/fragments/blobviewer.fragment.graphql

+fragment BlobViewer on SnippetBlobViewer {
+  collapsed
+  loadingPartialName
+  renderError
+  tooLarge
+}

app/assets/javascripts/snippets/components/snippet_blob_view.vue

 <script>
 import BlobEmbeddable from '~/blob/components/blob_embeddable.vue';
 import { SNIPPET_VISIBILITY_PUBLIC } from '../constants';
+import BlobHeader from '~/blob/components/blob_header.vue';
+import GetSnippetBlobQuery from '../queries/snippet.blob.query.graphql';
+import { GlLoadingIcon } from '@gitlab/ui';
 
 export default {
   components: {
     BlobEmbeddable,
+    BlobHeader,
+    GlLoadingIcon,
+  },
+  apollo: {
+    blob: {
+      query: GetSnippetBlobQuery,
+      variables() {
+        return {
+          ids: this.snippet.id,
+        };
+      },
+      update: data => data.snippets.edges[0].node.blob,
+    },
   },
   props: {
     snippet: {
@@ -12,15 +28,32 @@ export default {
       required: true,
     },
   },
+  data() {
+    return {
+      blob: {},
+    };
+  },
   computed: {
     embeddable() {
       return this.snippet.visibilityLevel === SNIPPET_VISIBILITY_PUBLIC;
     },
+    isBlobLoading() {
+      return this.$apollo.queries.blob.loading;
+    },
   },
 };
 </script>
 <template>
   <div>
     <blob-embeddable v-if="embeddable" class="mb-3" :url="snippet.webUrl" />
+    <gl-loading-icon
+      v-if="isBlobLoading"
+      :label="__('Loading blob')"
+      :size="2"
+      class="prepend-top-20 append-bottom-20"
+    />
+    <article v-else class="file-holder snippet-file-content">
+      <blob-header :blob="blob" />
+    </article>
   </div>
 </template>

app/assets/javascripts/snippets/queries/snippet.blob.query.graphql

+#import '~/graphql_shared/fragments/blobviewer.fragment.graphql'
+
+query SnippetBlobFull($ids: [ID!]) {
+  snippets(ids: $ids) {
+    edges {
+      node {
+        id
+        blob {
+          binary
+          name
+          path
+          rawPath
+          size
+          simpleViewer {
+            ...BlobViewer
+          }
+          richViewer {
+            ...BlobViewer
+          }
+        }
+      }
+    }
+  }
+}

locale/gitlab.pot

@@ -11419,6 +11419,9 @@ msgstr ""
 msgid "Live preview"
 msgstr ""
 
+msgid "Loading blob"
+msgstr ""
+
 msgid "Loading contribution stats for group members"
 msgstr ""
 

spec/frontend/blob/components/__snapshots__/blob_header_spec.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Blob Header Default Actions rendering matches the snapshot 1`] = `
+<div
+  class="js-file-title file-title-flex-parent"
+>
+  <blob-filepath-stub
+    blob="[object Object]"
+  />
+   
+  <div
+    class="file-actions d-none d-sm-block"
+  >
+    <viewer-switcher-stub
+      activeviewer="rich"
+      blob="[object Object]"
+    />
+      
+    <default-actions-stub
+      activeviewer="rich"
+      blob="[object Object]"
+    />
+  </div>
+</div>
+`;

spec/frontend/blob/components/blob_header_default_actions_spec.js

@@ -4,9 +4,11 @@ import {
   BTN_COPY_CONTENTS_TITLE,
   BTN_DOWNLOAD_TITLE,
   BTN_RAW_TITLE,
+  RICH_BLOB_VIEWER,
 } from '~/blob/components/constants';
 import { GlButtonGroup, GlButton } from '@gitlab/ui';
 import { Blob } from './mock_data';
+import eventHub from '~/blob/event_hub';
 
 describe('Blob Header Default Actions', () => {
   let wrapper;
@@ -14,10 +16,11 @@ describe('Blob Header Default Actions', () => {
   let buttons;
   const hrefPrefix = 'http://localhost';
 
-  function createComponent(props = {}) {
+  function createComponent(blobProps = {}, propsData = {}) {
     wrapper = mount(BlobHeaderActions, {
       propsData: {
-        blob: Object.assign({}, Blob, props),
+        blob: Object.assign({}, Blob, blobProps),
+        ...propsData,
       },
     });
   }
@@ -51,14 +54,30 @@ describe('Blob Header Default Actions', () => {
     it('correct href attribute on Download button', () => {
       expect(buttons.at(2).vm.$el.href).toBe(`${hrefPrefix}${Blob.rawPath}?inline=false`);
     });
+
+    it('does not render "Copy file contents" button as disables if the viewer is Simple', () => {
+      expect(buttons.at(0).attributes('disabled')).toBeUndefined();
+    });
+
+    it('renders "Copy file contents" button as disables if the viewer is Rich', () => {
+      createComponent(
+        {},
+        {
+          activeViewer: RICH_BLOB_VIEWER,
+        },
+      );
+      buttons = wrapper.findAll(GlButton);
+
+      expect(buttons.at(0).attributes('disabled')).toBeTruthy();
+    });
   });
 
   describe('functionally', () => {
     it('emits an event when a Copy Contents button is clicked', () => {
-      jest.spyOn(wrapper.vm, '$emit');
+      jest.spyOn(eventHub, '$emit');
       buttons.at(0).vm.$emit('click');
 
-      expect(wrapper.vm.$emit).toHaveBeenCalledWith('copy');
+      expect(eventHub.$emit).toHaveBeenCalledWith('copy');
     });
   });
 });

spec/frontend/blob/components/blob_header_spec.js

+import { shallowMount, mount } from '@vue/test-utils';
+import BlobHeader from '~/blob/components/blob_header.vue';
+import ViewerSwitcher from '~/blob/components/blob_header_viewer_switcher.vue';
+import DefaultActions from '~/blob/components/blob_header_default_actions.vue';
+import BlobFilepath from '~/blob/components/blob_header_filepath.vue';
+import eventHub from '~/blob/event_hub';
+
+import { Blob } from './mock_data';
+
+describe('Blob Header Default Actions', () => {
+  let wrapper;
+
+  function createComponent(blobProps = {}, options = {}, propsData = {}, shouldMount = false) {
+    const method = shouldMount ? mount : shallowMount;
+    wrapper = method.call(this, BlobHeader, {
+      propsData: {
+        blob: Object.assign({}, Blob, blobProps),
+        ...propsData,
+      },
+      ...options,
+    });
+  }
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('rendering', () => {
+    const slots = {
+      prepend: 'Foo Prepend',
+      actions: 'Actions Bar',
+    };
+
+    it('matches the snapshot', () => {
+      createComponent();
+      expect(wrapper.element).toMatchSnapshot();
+    });
+
+    it('renders all components', () => {
+      createComponent();
+      expect(wrapper.find(ViewerSwitcher).exists()).toBe(true);
+      expect(wrapper.find(DefaultActions).exists()).toBe(true);
+      expect(wrapper.find(BlobFilepath).exists()).toBe(true);
+    });
+
+    it('does not render viewer switcher if the blob has only the simple viewer', () => {
+      createComponent({
+        richViewer: null,
+      });
+      expect(wrapper.find(ViewerSwitcher).exists()).toBe(false);
+    });
+
+    it('does not render viewer switcher if a corresponding prop is passed', () => {
+      createComponent(
+        {},
+        {},
+        {
+          hideViewerSwitcher: true,
+        },
+      );
+      expect(wrapper.find(ViewerSwitcher).exists()).toBe(false);
+    });
+
+    it('does not render default actions is corresponding prop is passed', () => {
+      createComponent(
+        {},
+        {},
+        {
+          hideDefaultActions: true,
+        },
+      );
+      expect(wrapper.find(DefaultActions).exists()).toBe(false);
+    });
+
+    Object.keys(slots).forEach(slot => {
+      it('renders the slots', () => {
+        const slotContent = slots[slot];
+        createComponent(
+          {},
+          {
+            scopedSlots: {
+              [slot]: `<span>${slotContent}</span>`,
+            },
+          },
+          {},
+          true,
+        );
+        expect(wrapper.text()).toContain(slotContent);
+      });
+    });
+  });
+
+  describe('functionality', () => {
+    const newViewer = 'Foo Bar';
+
+    it('listens to "switch-view" event when viewer switcher is shown and updates activeViewer', () => {
+      expect(wrapper.vm.showViewerSwitcher).toBe(true);
+      eventHub.$emit('switch-viewer', newViewer);
+
+      return wrapper.vm.$nextTick().then(() => {
+        expect(wrapper.vm.activeViewer).toBe(newViewer);
+      });
+    });
+
+    it('does not update active viewer if the switcher is not shown', () => {
+      const activeViewer = 'Alpha Beta';
+      createComponent(
+        {},
+        {
+          data() {
+            return {
+              activeViewer,
+            };
+          },
+        },
+        {
+          hideViewerSwitcher: true,
+        },
+      );
+
+      expect(wrapper.vm.showViewerSwitcher).toBe(false);
+      eventHub.$emit('switch-viewer', newViewer);
+
+      return wrapper.vm.$nextTick().then(() => {
+        expect(wrapper.vm.activeViewer).toBe(activeViewer);
+      });
+    });
+  });
+});

spec/frontend/blob/components/blob_header_viewer_switcher_spec.js

@@ -8,14 +8,16 @@ import {
 } from '~/blob/components/constants';
 import { GlButtonGroup, GlButton } from '@gitlab/ui';
 import { Blob } from './mock_data';
+import eventHub from '~/blob/event_hub';
 
 describe('Blob Header Viewer Switcher', () => {
   let wrapper;
 
-  function createComponent(props = {}) {
+  function createComponent(blobProps = {}, propsData = {}) {
     wrapper = mount(BlobHeaderViewerSwitcher, {
       propsData: {
-        blob: Object.assign({}, Blob, props),
+        blob: Object.assign({}, Blob, blobProps),
+        ...propsData,
       },
     });
   }
@@ -25,14 +27,9 @@ describe('Blob Header Viewer Switcher', () => {
   });
 
   describe('intiialization', () => {
-    it('is initialized with rich viewer as preselected when richViewer exists', () => {
+    it('is initialized with simple viewer as active', () => {
       createComponent();
-      expect(wrapper.vm.viewer).toBe(RICH_BLOB_VIEWER);
-    });
-
-    it('is initialized with simple viewer as preselected when richViewer does not exists', () => {
-      createComponent({ richViewer: null });
-      expect(wrapper.vm.viewer).toBe(SIMPLE_BLOB_VIEWER);
+      expect(wrapper.vm.activeViewer).toBe(SIMPLE_BLOB_VIEWER);
     });
   });
 
@@ -63,46 +60,42 @@ describe('Blob Header Viewer Switcher', () => {
     let simpleBtn;
     let richBtn;
 
-    beforeEach(() => {
-      createComponent();
+    function factory(propsOptions = {}) {
+      createComponent({}, propsOptions);
       buttons = wrapper.findAll(GlButton);
       simpleBtn = buttons.at(0);
       richBtn = buttons.at(1);
-    });
 
-    it('does not switch the viewer if the selected one is already active', () => {
-      jest.spyOn(wrapper.vm, '$emit');
+      jest.spyOn(eventHub, '$emit');
+    }
 
-      expect(wrapper.vm.viewer).toBe(RICH_BLOB_VIEWER);
-      richBtn.vm.$emit('click');
-      expect(wrapper.vm.viewer).toBe(RICH_BLOB_VIEWER);
-      expect(wrapper.vm.$emit).not.toHaveBeenCalled();
+    it('does not switch the viewer if the selected one is already active', () => {
+      factory();
+      expect(wrapper.vm.activeViewer).toBe(SIMPLE_BLOB_VIEWER);
+      simpleBtn.vm.$emit('click');
+      expect(wrapper.vm.activeViewer).toBe(SIMPLE_BLOB_VIEWER);
+      expect(eventHub.$emit).not.toHaveBeenCalled();
     });
 
-    it('emits an event when a Simple Viewer button is clicked', () => {
-      jest.spyOn(wrapper.vm, '$emit');
+    it('emits an event when a Rich Viewer button is clicked', () => {
+      factory();
+      expect(wrapper.vm.activeViewer).toBe(SIMPLE_BLOB_VIEWER);
 
-      simpleBtn.vm.$emit('click');
+      richBtn.vm.$emit('click');
 
       return wrapper.vm.$nextTick().then(() => {
-        expect(wrapper.vm.viewer).toBe(SIMPLE_BLOB_VIEWER);
-        expect(wrapper.vm.$emit).toHaveBeenCalledWith('switch-viewer', SIMPLE_BLOB_VIEWER);
+        expect(eventHub.$emit).toHaveBeenCalledWith('switch-viewer', RICH_BLOB_VIEWER);
       });
     });
 
-    it('emits an event when a Rich Viewer button is clicked', () => {
-      jest.spyOn(wrapper.vm, '$emit');
-
-      wrapper.setData({ viewer: SIMPLE_BLOB_VIEWER });
+    it('emits an event when a Simple Viewer button is clicked', () => {
+      factory({
+        activeViewer: RICH_BLOB_VIEWER,
+      });
+      simpleBtn.vm.$emit('click');
 
-      return wrapper.vm
-        .$nextTick()
-        .then(() => {
-          richBtn.vm.$emit('click');
-        })
-        .then(() => {
-          expect(wrapper.vm.viewer).toBe(RICH_BLOB_VIEWER);
-          expect(wrapper.vm.$emit).toHaveBeenCalledWith('switch-viewer', RICH_BLOB_VIEWER);
+      return wrapper.vm.$nextTick().then(() => {
+        expect(eventHub.$emit).toHaveBeenCalledWith('switch-viewer', SIMPLE_BLOB_VIEWER);
       });
     });
   });

spec/frontend/snippets/components/snippet_blob_view_spec.js

 import { shallowMount } from '@vue/test-utils';
+import { GlLoadingIcon } from '@gitlab/ui';
 import SnippetBlobView from '~/snippets/components/snippet_blob_view.vue';
+import BlobHeader from '~/blob/components/blob_header.vue';
 import BlobEmbeddable from '~/blob/components/blob_embeddable.vue';
 import {
   SNIPPET_VISIBILITY_PRIVATE,
@@ -15,7 +17,15 @@ describe('Blob Embeddable', () => {
     visibilityLevel: SNIPPET_VISIBILITY_PUBLIC,
   };
 
-  function createComponent(props = {}) {
+  function createComponent(props = {}, loading = false) {
+    const $apollo = {
+      queries: {
+        blob: {
+          loading,
+        },
+      },
+    };
+
     wrapper = shallowMount(SnippetBlobView, {
       propsData: {
         snippet: {
@@ -23,32 +33,44 @@ describe('Blob Embeddable', () => {
           ...props,
         },
       },
+      mocks: { $apollo },
     });
+
+    wrapper.vm.$apollo.queries.blob.loading = false;
   }
 
   afterEach(() => {
     wrapper.destroy();
   });
 
-  it('renders blob-embeddable component', () => {
+  describe('rendering', () => {
+    it('renders correct components', () => {
       createComponent();
       expect(wrapper.find(BlobEmbeddable).exists()).toBe(true);
+      expect(wrapper.find(BlobHeader).exists()).toBe(true);
     });
 
-  it('does not render blob-embeddable for internal snippet', () => {
+    it.each([SNIPPET_VISIBILITY_INTERNAL, SNIPPET_VISIBILITY_PRIVATE, 'foo'])(
+      'does not render blob-embeddable by default',
+      visibilityLevel => {
         createComponent({
-      visibilityLevel: SNIPPET_VISIBILITY_INTERNAL,
+          visibilityLevel,
         });
         expect(wrapper.find(BlobEmbeddable).exists()).toBe(false);
+      },
+    );
 
+    it('does render blob-embeddable for public snippet', () => {
       createComponent({
-      visibilityLevel: SNIPPET_VISIBILITY_PRIVATE,
+        visibilityLevel: SNIPPET_VISIBILITY_PUBLIC,
+      });
+      expect(wrapper.find(BlobEmbeddable).exists()).toBe(true);
     });
-    expect(wrapper.find(BlobEmbeddable).exists()).toBe(false);
 
-    createComponent({
-      visibilityLevel: 'foo',
+    it('shows loading icon while blob data is in flight', () => {
+      createComponent({}, true);
+      expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
+      expect(wrapper.find('.snippet-file-content').exists()).toBe(false);
     });
-    expect(wrapper.find(BlobEmbeddable).exists()).toBe(false);
   });
 });