Add the source editor wrapper to be used by the Pipeline Wizard

Signed-off-by: Janis Altherr <jaltherr@gitlab.com>

app/assets/javascripts/pipeline_wizard/components/editor.vue

+<script>
+import { debounce } from 'lodash';
+import { isDocument } from 'yaml';
+import { CONTENT_UPDATE_DEBOUNCE } from '~/editor/constants';
+import SourceEditor from '~/editor/source_editor';
+import { YamlEditorExtension } from '~/editor/extensions/source_editor_yaml_ext';
+import { SourceEditorExtension } from '~/editor/extensions/source_editor_extension_base';
+
+export default {
+  name: 'YamlEditor',
+  props: {
+    doc: {
+      type: Object,
+      required: true,
+      validator: (d) => isDocument(d),
+    },
+    highlight: {
+      type: [String, Array],
+      required: false,
+      default: null,
+    },
+    filename: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      editor: null,
+      isUpdating: false,
+      yamlEditorExtension: null,
+    };
+  },
+  watch: {
+    doc: {
+      handler() {
+        this.updateEditorContent();
+      },
+      deep: true,
+    },
+    highlight(v) {
+      this.requestHighlight(v);
+    },
+  },
+  mounted() {
+    this.editor = new SourceEditor().createInstance({
+      el: this.$el,
+      blobPath: this.filename,
+      language: 'yaml',
+    });
+    [, this.yamlEditorExtension] = this.editor.use([
+      { definition: SourceEditorExtension },
+      {
+        definition: YamlEditorExtension,
+        setupOptions: {
+          highlightPath: this.highlight,
+        },
+      },
+    ]);
+    this.editor.onDidChangeModelContent(
+      debounce(() => this.handleChange(), CONTENT_UPDATE_DEBOUNCE),
+    );
+    this.updateEditorContent();
+    this.emitValue();
+  },
+  methods: {
+    async updateEditorContent() {
+      this.isUpdating = true;
+      this.editor.setDoc(this.doc);
+      this.isUpdating = false;
+      this.requestHighlight(this.highlight);
+    },
+    handleChange() {
+      this.emitValue();
+      if (!this.isUpdating) {
+        this.handleTouch();
+      }
+    },
+    emitValue() {
+      this.$emit('update:yaml', this.editor.getValue());
+    },
+    handleTouch() {
+      this.$emit('touch');
+    },
+    requestHighlight(path) {
+      this.editor.highlight(path, true);
+    },
+  },
+};
+</script>
+
+<template>
+  <div id="source-editor-yaml-editor"></div>
+</template>

spec/frontend/pipeline_wizard/components/editor_spec.js

+import { mount } from '@vue/test-utils';
+import { Document } from 'yaml';
+import YamlEditor from '~/pipeline_wizard/components/editor.vue';
+
+describe('Pages Yaml Editor wrapper', () => {
+  const defaultOptions = {
+    propsData: { doc: new Document({ foo: 'bar' }), filename: 'foo.yml' },
+  };
+
+  describe('mount hook', () => {
+    const wrapper = mount(YamlEditor, defaultOptions);
+
+    it('editor is mounted', () => {
+      expect(wrapper.vm.editor).not.toBeFalsy();
+      expect(wrapper.find('.gl-source-editor').exists()).toBe(true);
+    });
+  });
+
+  describe('watchers', () => {
+    describe('doc', () => {
+      const doc = new Document({ baz: ['bar'] });
+      let wrapper;
+
+      beforeEach(() => {
+        wrapper = mount(YamlEditor, defaultOptions);
+      });
+
+      afterEach(() => {
+        wrapper.destroy();
+      });
+
+      it("causes the editor's value to be set to the stringified document", async () => {
+        await wrapper.setProps({ doc });
+        expect(wrapper.vm.editor.getValue()).toEqual(doc.toString());
+      });
+
+      it('emits an update:yaml event with the yaml representation of doc', async () => {
+        await wrapper.setProps({ doc });
+        const changeEvents = wrapper.emitted('update:yaml');
+        expect(changeEvents[2]).toEqual([doc.toString()]);
+      });
+
+      it('does not cause the touch event to be emitted', () => {
+        wrapper.setProps({ doc });
+        expect(wrapper.emitted('touch')).not.toBeTruthy();
+      });
+    });
+
+    describe('highlight', () => {
+      const highlight = 'foo';
+      const wrapper = mount(YamlEditor, defaultOptions);
+
+      it('calls editor.highlight(path, keep=true)', async () => {
+        const highlightSpy = jest.spyOn(wrapper.vm.yamlEditorExtension.obj, 'highlight');
+        await wrapper.setProps({ highlight });
+        expect(highlightSpy).toHaveBeenCalledWith(expect.anything(), highlight, true);
+      });
+    });
+  });
+
+  describe('events', () => {
+    const wrapper = mount(YamlEditor, defaultOptions);
+
+    it('emits touch if content is changed in editor', async () => {
+      await wrapper.vm.editor.setValue('foo: boo');
+      expect(wrapper.emitted('touch')).toBeTruthy();
+    });
+  });
+});