Setup snippet blob utils and components for multi file

- The utilities in utils/blob are not used yet
  but they will be in the next step.

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

 <script>
-import { GlFormInput } from '@gitlab/ui';
+import { GlFormInput, GlButton } from '@gitlab/ui';
 
 export default {
   components: {
     GlFormInput,
+    GlButton,
   },
   inheritAttrs: false,
   props: {
@@ -11,6 +12,16 @@ export default {
       type: String,
       required: true,
     },
+    canDelete: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    showDelete: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
   },
   data() {
     return {
@@ -21,8 +32,8 @@ export default {
 </script>
 <template>
   <div class="js-file-title file-title-flex-parent">
+    <div class="gl-display-flex gl-align-items-center gl-w-full">
       <gl-form-input
-      id="snippet_file_name"
         v-model="name"
         :placeholder="
           s__('Snippets|Give your file a name to add code highlighting, e.g. example.rb for Ruby')
@@ -33,5 +44,15 @@ export default {
         v-bind="$attrs"
         @change="$emit('input', name)"
       />
+      <gl-button
+        v-if="showDelete"
+        class="gl-ml-4"
+        variant="danger"
+        category="secondary"
+        :disabled="!canDelete"
+        @click="$emit('delete')"
+        >{{ s__('Snippets|Delete file') }}</gl-button
+      >
+    </div>
   </div>
 </template>

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

@@ -18,7 +18,7 @@ import {
   SNIPPET_BLOB_ACTION_UPDATE,
   SNIPPET_BLOB_ACTION_MOVE,
 } from '../constants';
-import SnippetBlobEdit from './snippet_blob_edit.vue';
+import SnippetBlobActionsEdit from './snippet_blob_actions_edit.vue';
 import SnippetVisibilityEdit from './snippet_visibility_edit.vue';
 import SnippetDescriptionEdit from './snippet_description_edit.vue';
 import { SNIPPET_MARK_EDIT_APP_START } from '~/performance_constants';
@@ -27,7 +27,7 @@ export default {
   components: {
     SnippetDescriptionEdit,
     SnippetVisibilityEdit,
-    SnippetBlobEdit,
+    SnippetBlobActionsEdit,
     TitleField,
     FormFooterActions,
     GlButton,
@@ -261,15 +261,7 @@ export default {
         :markdown-preview-path="markdownPreviewPath"
         :markdown-docs-path="markdownDocsPath"
       />
-      <template v-if="blobs.length">
-        <snippet-blob-edit
-          v-for="blob in blobs"
-          :key="blob.name"
-          :blob="blob"
-          @blob-updated="updateBlobActions"
-        />
-      </template>
-      <snippet-blob-edit v-else @blob-updated="updateBlobActions" />
+      <snippet-blob-actions-edit :blobs="blobs" @blob-updated="updateBlobActions" />
 
       <snippet-visibility-edit
         v-model="snippet.visibilityLevel"

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

+<script>
+import SnippetBlobEdit from './snippet_blob_edit.vue';
+
+export default {
+  components: {
+    SnippetBlobEdit,
+  },
+  props: {
+    blobs: {
+      type: Array,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="form-group file-editor">
+    <label>{{ s__('Snippets|File') }}</label>
+    <template v-if="blobs.length">
+      <snippet-blob-edit v-for="blob in blobs" :key="blob.name" :blob="blob" v-on="$listeners" />
+    </template>
+    <snippet-blob-edit v-else v-on="$listeners" />
+  </div>
+</template>

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

@@ -91,8 +91,6 @@ export default {
 };
 </script>
 <template>
-  <div class="form-group file-editor">
-    <label>{{ s__('Snippets|File') }}</label>
   <div class="file-holder snippet">
     <blob-header-edit v-model="filePath" data-qa-selector="file_name_field" />
     <gl-loading-icon
@@ -103,5 +101,4 @@ export default {
     />
     <blob-content-edit v-else v-model="content" :file-global-id="id" :file-name="filePath" />
   </div>
-  </div>
 </template>

app/assets/javascripts/snippets/constants.js

@@ -30,3 +30,4 @@ export const SNIPPET_BLOB_CONTENT_FETCH_ERROR = __("Can't fetch content for the
 export const SNIPPET_BLOB_ACTION_CREATE = 'create';
 export const SNIPPET_BLOB_ACTION_UPDATE = 'update';
 export const SNIPPET_BLOB_ACTION_MOVE = 'move';
+export const SNIPPET_BLOB_ACTION_DELETE = 'delete';

app/assets/javascripts/snippets/utils/blob.js

+import { uniqueId } from 'lodash';
+import {
+  SNIPPET_BLOB_ACTION_CREATE,
+  SNIPPET_BLOB_ACTION_UPDATE,
+  SNIPPET_BLOB_ACTION_MOVE,
+  SNIPPET_BLOB_ACTION_DELETE,
+} from '../constants';
+
+const createLocalId = () => uniqueId('blob_local_');
+
+export const decorateBlob = blob => ({
+  ...blob,
+  id: createLocalId(),
+  isLoaded: false,
+  content: '',
+});
+
+export const createBlob = () => ({
+  id: createLocalId(),
+  content: '',
+  path: '',
+  isLoaded: true,
+});
+
+const diff = ({ content, path }, origBlob) => {
+  if (!origBlob) {
+    return {
+      action: SNIPPET_BLOB_ACTION_CREATE,
+      previousPath: path,
+      content,
+      filePath: path,
+    };
+  } else if (origBlob.path !== path || origBlob.content !== content) {
+    return {
+      action: origBlob.path === path ? SNIPPET_BLOB_ACTION_UPDATE : SNIPPET_BLOB_ACTION_MOVE,
+      previousPath: origBlob.path,
+      content,
+      filePath: path,
+    };
+  }
+
+  return null;
+};
+
+/**
+ * This function returns an array of diff actions (to be sent to the BE) based on the current vs. original blobs
+ *
+ * @param {Object} blobs
+ * @param {Object} origBlobs
+ */
+export const diffAll = (blobs, origBlobs) => {
+  const deletedEntries = Object.values(origBlobs)
+    .filter(x => !blobs[x.id])
+    .map(({ path, content }) => ({
+      action: SNIPPET_BLOB_ACTION_DELETE,
+      previousPath: path,
+      filePath: path,
+      content,
+    }));
+
+  const newEntries = Object.values(blobs)
+    .map(blob => diff(blob, origBlobs[blob.id]))
+    .filter(x => x);
+
+  return [...deletedEntries, ...newEntries];
+};

locale/gitlab.pot

@@ -22552,6 +22552,9 @@ msgstr ""
 msgid "SnippetsEmptyState|There are no snippets to show."
 msgstr ""
 
+msgid "Snippets|Delete file"
+msgstr ""
+
 msgid "Snippets|Description (optional)"
 msgstr ""
 

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

@@ -4,13 +4,18 @@ exports[`Blob Header Editing rendering matches the snapshot 1`] = `
 <div
   class="js-file-title file-title-flex-parent"
 >
+  <div
+    class="gl-display-flex gl-align-items-center gl-w-full"
+  >
     <gl-form-input-stub
       class="form-control js-snippet-file-name"
-    id="snippet_file_name"
       name="snippet_file_name"
       placeholder="Give your file a name to add code highlighting, e.g. example.rb for Ruby"
       type="text"
       value="foo.md"
     />
+     
+    <!---->
+  </div>
 </div>
 `;

spec/frontend/blob/components/blob_edit_header_spec.js

 import { shallowMount } from '@vue/test-utils';
 import BlobEditHeader from '~/blob/components/blob_edit_header.vue';
-import { GlFormInput } from '@gitlab/ui';
+import { GlFormInput, GlButton } from '@gitlab/ui';
 
 describe('Blob Header Editing', () => {
   let wrapper;
   const value = 'foo.md';
 
-  function createComponent() {
+  const createComponent = (props = {}) => {
     wrapper = shallowMount(BlobEditHeader, {
       propsData: {
         value,
+        ...props,
       },
     });
-  }
+  };
+  const findDeleteButton = () =>
+    wrapper.findAll(GlButton).wrappers.find(x => x.text() === 'Delete file');
 
   beforeEach(() => {
     createComponent();
@@ -30,6 +33,10 @@ describe('Blob Header Editing', () => {
     it('contains a form input field', () => {
       expect(wrapper.contains(GlFormInput)).toBe(true);
     });
+
+    it('does not show delete button', () => {
+      expect(findDeleteButton()).toBeUndefined();
+    });
   });
 
   describe('functionality', () => {
@@ -47,4 +54,35 @@ describe('Blob Header Editing', () => {
       });
     });
   });
+
+  describe.each`
+    props                                    | expectedDisabled
+    ${{ showDelete: true }}                  | ${true}
+    ${{ showDelete: true, canDelete: true }} | ${false}
+  `('with $props', ({ props, expectedDisabled }) => {
+    beforeEach(() => {
+      createComponent(props);
+    });
+
+    it(`shows delete button (disabled=${expectedDisabled})`, () => {
+      const deleteButton = findDeleteButton();
+
+      expect(deleteButton.exists()).toBe(true);
+      expect(deleteButton.props('disabled')).toBe(expectedDisabled);
+    });
+  });
+
+  describe('with delete button', () => {
+    beforeEach(() => {
+      createComponent({ showDelete: true, canDelete: true });
+    });
+
+    it('emits delete when clicked', () => {
+      expect(wrapper.emitted().delete).toBeUndefined();
+
+      findDeleteButton().vm.$emit('click');
+
+      expect(wrapper.emitted().delete).toEqual([[]]);
+    });
+  });
 });

spec/frontend/snippets/components/__snapshots__/snippet_blob_edit_spec.js.snap

@@ -2,15 +2,8 @@
 
 exports[`Snippet Blob Edit component rendering matches the snapshot 1`] = `
 <div
-  class="form-group file-editor"
->
-  <label>
-    File
-  </label>
-   
-  <div
   class="file-holder snippet"
-  >
+>
   <blob-header-edit-stub
     data-qa-selector="file_name_field"
     value="lorem.txt"
@@ -21,6 +14,5 @@ exports[`Snippet Blob Edit component rendering matches the snapshot 1`] = `
     filename="lorem.txt"
     value="Lorem ipsum dolor sit amet, consectetur adipiscing elit."
   />
-  </div>
 </div>
 `;

spec/frontend/snippets/components/edit_spec.js

@@ -7,7 +7,7 @@ import { redirectTo } from '~/lib/utils/url_utility';
 import SnippetEditApp from '~/snippets/components/edit.vue';
 import SnippetDescriptionEdit from '~/snippets/components/snippet_description_edit.vue';
 import SnippetVisibilityEdit from '~/snippets/components/snippet_visibility_edit.vue';
-import SnippetBlobEdit from '~/snippets/components/snippet_blob_edit.vue';
+import SnippetBlobActionsEdit from '~/snippets/components/snippet_blob_actions_edit.vue';
 import TitleField from '~/vue_shared/components/form/title.vue';
 import FormFooterActions from '~/vue_shared/components/form/form_footer_actions.vue';
 import { SNIPPET_CREATE_MUTATION_ERROR, SNIPPET_UPDATE_MUTATION_ERROR } from '~/snippets/constants';
@@ -141,7 +141,7 @@ describe('Snippet Edit app', () => {
 
       expect(wrapper.contains(TitleField)).toBe(true);
       expect(wrapper.contains(SnippetDescriptionEdit)).toBe(true);
-      expect(wrapper.contains(SnippetBlobEdit)).toBe(true);
+      expect(wrapper.contains(SnippetBlobActionsEdit)).toBe(true);
       expect(wrapper.contains(SnippetVisibilityEdit)).toBe(true);
       expect(wrapper.contains(FormFooterActions)).toBe(true);
     });

spec/frontend/snippets/components/snippet_blob_actions_edit_spec.js

+import { shallowMount } from '@vue/test-utils';
+import SnippetBlobActionsEdit from '~/snippets/components/snippet_blob_actions_edit.vue';
+import SnippetBlobEdit from '~/snippets/components/snippet_blob_edit.vue';
+
+const TEST_BLOBS = [
+  { name: 'foo', content: 'abc', rawPath: 'test/raw' },
+  { name: 'bar', content: 'def', rawPath: 'test/raw' },
+];
+const TEST_EVENT = 'blob-update';
+
+describe('snippets/components/snippet_blob_actions_edit', () => {
+  let onEvent;
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(SnippetBlobActionsEdit, {
+      propsData: {
+        blobs: [],
+        ...props,
+      },
+      listeners: {
+        [TEST_EVENT]: onEvent,
+      },
+    });
+  };
+  const findBlobEdit = () => wrapper.find(SnippetBlobEdit);
+  const findBlobEditData = () => wrapper.findAll(SnippetBlobEdit).wrappers.map(x => x.props());
+
+  beforeEach(() => {
+    onEvent = jest.fn();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe.each`
+    props                    | expectedData
+    ${{}}                    | ${[{ blob: null }]}
+    ${{ blobs: TEST_BLOBS }} | ${TEST_BLOBS.map(blob => ({ blob }))}
+  `('with $props', ({ props, expectedData }) => {
+    beforeEach(() => {
+      createComponent(props);
+    });
+
+    it('renders blob edit', () => {
+      expect(findBlobEditData()).toEqual(expectedData);
+    });
+
+    it('emits event', () => {
+      expect(onEvent).not.toHaveBeenCalled();
+
+      findBlobEdit().vm.$emit('blob-update', TEST_BLOBS[0]);
+
+      expect(onEvent).toHaveBeenCalledWith(TEST_BLOBS[0]);
+    });
+  });
+});

spec/frontend/snippets/utils/blob_spec.js

+import { cloneDeep } from 'lodash';
+import {
+  SNIPPET_BLOB_ACTION_CREATE,
+  SNIPPET_BLOB_ACTION_UPDATE,
+  SNIPPET_BLOB_ACTION_MOVE,
+  SNIPPET_BLOB_ACTION_DELETE,
+} from '~/snippets/constants';
+import { decorateBlob, createBlob, diffAll } from '~/snippets/utils/blob';
+
+jest.mock('lodash/uniqueId', () => arg => `${arg}fakeUniqueId`);
+
+const TEST_RAW_BLOB = {
+  rawPath: '/test/blob/7/raw',
+};
+const CONTENT_1 = 'Lorem ipsum dolar\nSit amit\n\nGoodbye!\n';
+const CONTENT_2 = 'Lorem ipsum dolar sit amit.\n\nGoodbye!\n';
+
+describe('~/snippets/utils/blob', () => {
+  describe('decorateBlob', () => {
+    it('should decorate the given object with local blob properties', () => {
+      const orig = cloneDeep(TEST_RAW_BLOB);
+
+      expect(decorateBlob(orig)).toEqual({
+        ...TEST_RAW_BLOB,
+        id: 'blob_local_fakeUniqueId',
+        isLoaded: false,
+        content: '',
+      });
+    });
+  });
+
+  describe('createBlob', () => {
+    it('should create an empty local blob', () => {
+      expect(createBlob()).toEqual({
+        id: 'blob_local_fakeUniqueId',
+        isLoaded: true,
+        content: '',
+        path: '',
+      });
+    });
+  });
+
+  describe('diffAll', () => {
+    // This object contains entries that contain an expected "diff" and the `id`
+    // or `origContent` that should be used to generate the expected diff.
+    const testEntries = {
+      created: {
+        id: 'blob_1',
+        diff: {
+          action: SNIPPET_BLOB_ACTION_CREATE,
+          filePath: '/new/file',
+          previousPath: '/new/file',
+          content: CONTENT_1,
+        },
+      },
+      deleted: {
+        id: 'blob_2',
+        diff: {
+          action: SNIPPET_BLOB_ACTION_DELETE,
+          filePath: '/src/delete/me',
+          previousPath: '/src/delete/me',
+          content: CONTENT_1,
+        },
+      },
+      updated: {
+        id: 'blob_3',
+        origContent: CONTENT_1,
+        diff: {
+          action: SNIPPET_BLOB_ACTION_UPDATE,
+          filePath: '/lorem.md',
+          previousPath: '/lorem.md',
+          content: CONTENT_2,
+        },
+      },
+      renamed: {
+        id: 'blob_4',
+        diff: {
+          action: SNIPPET_BLOB_ACTION_MOVE,
+          filePath: '/dolar.md',
+          previousPath: '/ipsum.md',
+          content: CONTENT_1,
+        },
+      },
+      renamedAndUpdated: {
+        id: 'blob_5',
+        origContent: CONTENT_1,
+        diff: {
+          action: SNIPPET_BLOB_ACTION_MOVE,
+          filePath: '/sit.md',
+          previousPath: '/sit/amit.md',
+          content: CONTENT_2,
+        },
+      },
+    };
+    const createBlobsFromTestEntries = (entries, isOrig = false) =>
+      entries.reduce(
+        (acc, { id, diff, origContent }) =>
+          Object.assign(acc, {
+            [id]: {
+              id,
+              content: isOrig && origContent ? origContent : diff.content,
+              path: isOrig ? diff.previousPath : diff.filePath,
+            },
+          }),
+        {},
+      );
+
+    it('should create diff from original files', () => {
+      const origBlobs = createBlobsFromTestEntries(
+        [
+          testEntries.deleted,
+          testEntries.updated,
+          testEntries.renamed,
+          testEntries.renamedAndUpdated,
+        ],
+        true,
+      );
+      const blobs = createBlobsFromTestEntries([
+        testEntries.created,
+        testEntries.updated,
+        testEntries.renamed,
+        testEntries.renamedAndUpdated,
+      ]);
+
+      expect(diffAll(blobs, origBlobs)).toEqual([
+        testEntries.deleted.diff,
+        testEntries.created.diff,
+        testEntries.updated.diff,
+        testEntries.renamed.diff,
+        testEntries.renamedAndUpdated.diff,
+      ]);
+    });
+  });
+});