Add static validation to gitlab CI yaml

This change fetches the external YML schema for the gitlab-ci file
and adds it to the Pipeline/CI Editor.

Adds option `inheritAttrs: false` to prevent the
contents of the file from being added to the text editor <div>
container.

app/assets/javascripts/pipeline_editor/components/text_editor.vue

 <script>
 import EditorLite from '~/vue_shared/components/editor_lite.vue';
+import { CiSchemaExtension } from '~/editor/editor_ci_schema_ext';
 
 export default {
   components: {
     EditorLite,
   },
+  inheritAttrs: false,
+  props: {
+    ciConfigPath: {
+      type: String,
+      required: true,
+    },
+    commitSha: {
+      type: String,
+      required: false,
+      default: null,
+    },
+    projectPath: {
+      type: String,
+      required: true,
+    },
+  },
+  methods: {
+    onEditorReady() {
+      const editorInstance = this.$refs.editor.getEditor();
+      const [projectNamespace, projectPath] = this.projectPath.split('/');
+
+      editorInstance.use(new CiSchemaExtension());
+      editorInstance.registerCiSchema({
+        projectPath,
+        projectNamespace,
+        ref: this.commitSha,
+      });
+    },
+  },
 };
 </script>
 <template>
   <div class="gl-border-solid gl-border-gray-100 gl-border-1">
-    <editor-lite file-name="*.yml" v-bind="$attrs" v-on="$listeners" />
+    <editor-lite
+      ref="editor"
+      :file-name="ciConfigPath"
+      v-bind="$attrs"
+      @editor-ready="onEditorReady"
+      v-on="$listeners"
+    />
   </div>
 </template>

app/assets/javascripts/pipeline_editor/pipeline_editor_app.vue

@@ -277,7 +277,13 @@ export default {
           <!-- editor should be mounted when its tab is visible, so the container has a size -->
           <gl-tab :title="$options.i18n.tabEdit" :lazy="!editorIsReady">
             <!-- editor should be mounted only once, when the tab is displayed -->
-            <text-editor v-model="contentModel" @editor-ready="editorIsReady = true" />
+            <text-editor
+              v-model="contentModel"
+              :ci-config-path="ciConfigPath"
+              :commit-sha="lastCommitSha"
+              :project-path="projectPath"
+              @editor-ready="editorIsReady = true"
+            />
           </gl-tab>
 
           <gl-tab

spec/frontend/pipeline_editor/components/text_editor_spec.js

 import { shallowMount } from '@vue/test-utils';
-import EditorLite from '~/vue_shared/components/editor_lite.vue';
-import { mockCiYml } from '../mock_data';
+import {
+  mockCiConfigPath,
+  mockCiYml,
+  mockCommitSha,
+  mockProjectPath,
+  mockNamespace,
+  mockProjectName,
+} from '../mock_data';
 
 import TextEditor from '~/pipeline_editor/components/text_editor.vue';
 
 describe('~/pipeline_editor/components/text_editor.vue', () => {
   let wrapper;
-  const editorReadyListener = jest.fn();
 
-  const createComponent = (attrs = {}, mountFn = shallowMount) => {
+  let editorReadyListener;
+  let mockUse;
+  let mockRegisterCiSchema;
+
+  const MockEditorLite = {
+    template: '<div/>',
+    props: ['value', 'fileName'],
+    mounted() {
+      this.$emit('editor-ready');
+    },
+    methods: {
+      getEditor: () => ({
+        use: mockUse,
+        registerCiSchema: mockRegisterCiSchema,
+      }),
+    },
+  };
+
+  const createComponent = (opts = {}, mountFn = shallowMount) => {
     wrapper = mountFn(TextEditor, {
+      propsData: {
+        ciConfigPath: mockCiConfigPath,
+        commitSha: mockCommitSha,
+        projectPath: mockProjectPath,
+      },
       attrs: {
         value: mockCiYml,
-        ...attrs,
       },
       listeners: {
         'editor-ready': editorReadyListener,
       },
+      stubs: {
+        EditorLite: MockEditorLite,
+      },
+      ...opts,
     });
   };
 
-  const findEditor = () => wrapper.find(EditorLite);
+  const findEditor = () => wrapper.find(MockEditorLite);
+
+  beforeEach(() => {
+    editorReadyListener = jest.fn();
+    mockUse = jest.fn();
+    mockRegisterCiSchema = jest.fn();
 
-  it('contains an editor', () => {
     createComponent();
+  });
 
+  it('contains an editor', () => {
     expect(findEditor().exists()).toBe(true);
   });
 
@@ -32,8 +69,18 @@ describe('~/pipeline_editor/components/text_editor.vue', () => {
     expect(findEditor().props('value')).toBe(mockCiYml);
   });
 
-  it('editor is configured for .yml', () => {
-    expect(findEditor().props('fileName')).toBe('*.yml');
+  it('editor is configured for the CI config path', () => {
+    expect(findEditor().props('fileName')).toBe(mockCiConfigPath);
+  });
+
+  it('editor is configured with syntax highligting', async () => {
+    expect(mockUse).toHaveBeenCalledTimes(1);
+    expect(mockRegisterCiSchema).toHaveBeenCalledTimes(1);
+    expect(mockRegisterCiSchema).toHaveBeenCalledWith({
+      projectNamespace: mockNamespace,
+      projectPath: mockProjectName,
+      ref: mockCommitSha,
+    });
   });
 
   it('bubbles up events', () => {

spec/frontend/pipeline_editor/mock_data.js

 import { CI_CONFIG_STATUS_VALID } from '~/pipeline_editor/constants';
 
-export const mockProjectPath = 'user1/project1';
+export const mockNamespace = 'user1';
+export const mockProjectName = 'project1';
+export const mockProjectPath = `${mockNamespace}/${mockProjectName}`;
 export const mockDefaultBranch = 'master';
 export const mockNewMergeRequestPath = '/-/merge_requests/new';
 export const mockCommitSha = 'aabbccdd';

spec/frontend/pipeline_editor/pipeline_editor_app_spec.js

@@ -42,6 +42,10 @@ jest.mock('~/lib/utils/url_utility', () => ({
   mergeUrlParams: jest.requireActual('~/lib/utils/url_utility').mergeUrlParams,
 }));
 
+const MockEditorLite = {
+  template: '<div/>',
+};
+
 describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
   let wrapper;
 
@@ -87,9 +91,7 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
         GlTabs,
         GlButton,
         CommitForm,
-        EditorLite: {
-          template: '<div/>',
-        },
+        EditorLite: MockEditorLite,
         TextEditor,
       },
       mocks: {
@@ -140,6 +142,7 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
   const findTabAt = i => wrapper.findAll(GlTab).at(i);
   const findVisualizationTab = () => wrapper.find('[data-testid="visualization-tab"]');
   const findTextEditor = () => wrapper.find(TextEditor);
+  const findEditorLite = () => wrapper.find(MockEditorLite);
   const findCommitForm = () => wrapper.find(CommitForm);
   const findPipelineGraph = () => wrapper.find(PipelineGraph);
   const findCommitBtnLoadingIcon = () => wrapper.find('[type="submit"]').find(GlLoadingIcon);
@@ -236,7 +239,14 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
 
     it('displays content after the query loads', () => {
       expect(findLoadingIcon().exists()).toBe(false);
-      expect(findTextEditor().attributes('value')).toBe(mockCiYml);
+
+      expect(findEditorLite().attributes('value')).toBe(mockCiYml);
+      expect(findEditorLite().attributes('file-name')).toBe(mockCiConfigPath);
+    });
+
+    it('configures text editor', () => {
+      expect(findTextEditor().props('commitSha')).toBe(mockCommitSha);
+      expect(findTextEditor().props('projectPath')).toBe(mockProjectPath);
     });
 
     describe('commit form', () => {
@@ -389,7 +399,7 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
         it('content is restored after cancel is called', async () => {
           await cancelCommitForm();
 
-          expect(findTextEditor().attributes('value')).toBe(mockCiYml);
+          expect(findEditorLite().attributes('value')).toBe(mockCiYml);
         });
       });
     });
@@ -403,7 +413,7 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
       await waitForPromises();
 
       expect(findAlert().exists()).toBe(false);
-      expect(findTextEditor().attributes('value')).toBe(mockCiYml);
+      expect(findEditorLite().attributes('value')).toBe(mockCiYml);
     });
 
     it('shows a 404 error message', async () => {