Support multiple outputs in Jupyter notebooks

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/31910, https://gitlab.com/gitlab-org/gitlab-ce/issues/32588

app/assets/javascripts/notebook/cells/code.vue

 <script>
-import CodeCell from './code/index.vue';
+import CodeOutput from './code/index.vue';
 import OutputCell from './output/index.vue';
 
 export default {
+  name: 'CodeCell',
   components: {
-    'code-cell': CodeCell,
-    'output-cell': OutputCell,
+    CodeOutput,
+    OutputCell,
   },
   props: {
     cell: {
@@ -29,8 +30,8 @@ export default {
     hasOutput() {
       return this.cell.outputs.length;
     },
-    output() {
-      return this.cell.outputs[0];
+    outputs() {
+      return this.cell.outputs;
     },
   },
 };
@@ -38,7 +39,7 @@ export default {
 
 <template>
   <div class="cell">
-    <code-cell
+    <code-output
       :raw-code="rawInputCode"
       :count="cell.execution_count"
       :code-css-class="codeCssClass"
@@ -47,7 +48,7 @@ export default {
     <output-cell
       v-if="hasOutput"
       :count="cell.execution_count"
-      :output="output"
+      :outputs="outputs"
       :code-css-class="codeCssClass"
     />
   </div>

app/assets/javascripts/notebook/cells/code/index.vue

@@ -3,8 +3,9 @@ import Prism from '../../lib/highlight';
 import Prompt from '../prompt.vue';
 
 export default {
+  name: 'CodeOutput',
   components: {
-    prompt: Prompt,
+    Prompt,
   },
   props: {
     count: {

app/assets/javascripts/notebook/cells/output/html.vue

@@ -4,13 +4,21 @@ import Prompt from '../prompt.vue';
 
 export default {
   components: {
-    prompt: Prompt,
+    Prompt,
   },
   props: {
+    count: {
+      type: Number,
+      required: true,
+    },
     rawCode: {
       type: String,
       required: true,
     },
+    index: {
+      type: Number,
+      required: true,
+    },
   },
   computed: {
     sanitizedOutput() {
@@ -21,13 +29,16 @@ export default {
         },
       });
     },
+    showOutput() {
+      return this.index === 0;
+    },
   },
 };
 </script>
 
 <template>
   <div class="output">
-    <prompt />
+    <prompt type="Out" :count="count" :show-output="showOutput" />
     <div v-html="sanitizedOutput"></div>
   </div>
 </template>

app/assets/javascripts/notebook/cells/output/image.vue

@@ -6,6 +6,10 @@ export default {
     prompt: Prompt,
   },
   props: {
+    count: {
+      type: Number,
+      required: true,
+    },
     outputType: {
       type: String,
       required: true,
@@ -14,10 +18,24 @@ export default {
       type: String,
       required: true,
     },
+    index: {
+      type: Number,
+      required: true,
+    },
+  },
+  computed: {
+    imgSrc() {
+      return `data:${this.outputType};base64,${this.rawCode}`;
+    },
+    showOutput() {
+      return this.index === 0;
+    },
   },
 };
 </script>
 
 <template>
-  <div class="output"><prompt /> <img :src="'data:' + outputType + ';base64,' + rawCode" /></div>
+  <div class="output">
+    <prompt type="out" :count="count" :show-output="showOutput" /> <img :src="imgSrc" />
+  </div>
 </template>

app/assets/javascripts/notebook/cells/output/index.vue

 <script>
-import CodeCell from '../code/index.vue';
-import Html from './html.vue';
-import Image from './image.vue';
+import CodeOutput from '../code/index.vue';
+import HtmlOutput from './html.vue';
+import ImageOutput from './image.vue';
 
 export default {
-  components: {
-    'code-cell': CodeCell,
-    'html-output': Html,
-    'image-output': Image,
-  },
   props: {
     codeCssClass: {
       type: String,
@@ -20,68 +15,69 @@ export default {
       required: false,
       default: 0,
     },
-    output: {
-      type: Object,
+    outputs: {
+      type: Array,
       required: true,
-      default: () => ({}),
     },
   },
-  computed: {
-    componentName() {
-      if (this.output.text) {
-        return 'code-cell';
-      } else if (this.output.data['image/png']) {
-        return 'image-output';
-      } else if (this.output.data['text/html']) {
-        return 'html-output';
-      } else if (this.output.data['image/svg+xml']) {
-        return 'html-output';
-      }
-
-      return 'code-cell';
+  data() {
+    return {
+      outputType: '',
+    };
   },
-    rawCode() {
-      if (this.output.text) {
-        return this.output.text.join('');
+  methods: {
+    dataForType(output, type) {
+      let data = output.data[type];
+
+      if (typeof data === 'object') {
+        data = data.join('');
       }
 
-      return this.dataForType(this.outputType);
+      return data;
     },
-    outputType() {
-      if (this.output.text) {
-        return '';
-      } else if (this.output.data['image/png']) {
-        return 'image/png';
-      } else if (this.output.data['text/html']) {
-        return 'text/html';
-      } else if (this.output.data['image/svg+xml']) {
-        return 'image/svg+xml';
+    getComponent(output) {
+      if (output.text) {
+        return CodeOutput;
+      } else if (output.data['image/png']) {
+        this.outputType = 'image/png';
+
+        return ImageOutput;
+      } else if (output.data['text/html']) {
+        this.outputType = 'text/html';
+
+        return HtmlOutput;
+      } else if (output.data['image/svg+xml']) {
+        this.outputType = 'image/svg+xml';
+
+        return HtmlOutput;
       }
 
-      return 'text/plain';
-    },
+      this.outputType = 'text/plain';
+      return CodeOutput;
     },
-  methods: {
-    dataForType(type) {
-      let data = this.output.data[type];
-
-      if (typeof data === 'object') {
-        data = data.join('');
+    rawCode(output) {
+      if (output.text) {
+        return output.text.join('');
       }
 
-      return data;
+      return this.dataForType(output, this.outputType);
     },
   },
 };
 </script>
 
 <template>
+  <div>
     <component
-    :is="componentName"
+      :is="getComponent(output)"
+      v-for="(output, index) in outputs"
+      :key="index"
+      type="output"
       :output-type="outputType"
       :count="count"
-    :raw-code="rawCode"
+      :index="index"
+      :raw-code="rawCode(output)"
       :code-css-class="codeCssClass"
-    type="output"
     />
+  </div>
 </template>

app/assets/javascripts/notebook/cells/prompt.vue

@@ -11,18 +11,26 @@ export default {
       required: false,
       default: 0,
     },
+    showOutput: {
+      type: Boolean,
+      required: false,
+      default: true,
+    },
   },
   computed: {
     hasKeys() {
       return this.type !== '' && this.count;
     },
+    showTypeText() {
+      return this.type && this.count && this.showOutput;
+    },
   },
 };
 </script>
 
 <template>
   <div class="prompt">
-    <span v-if="hasKeys"> {{ type }} [{{ count }}]: </span>
+    <span v-if="showTypeText"> {{ type }} [{{ count }}]: </span>
   </div>
 </template>
 

app/assets/javascripts/notebook/index.vue

@@ -3,8 +3,8 @@ import { MarkdownCell, CodeCell } from './cells';
 
 export default {
   components: {
-    'code-cell': CodeCell,
-    'markdown-cell': MarkdownCell,
+    CodeCell,
+    MarkdownCell,
   },
   props: {
     notebook: {

changelogs/unreleased/notebook-multiple-outputs.yml

+---
+title: Support multiple outputs in jupyter notebooks
+merge_request:
+author:
+type: changed

spec/javascripts/notebook/cells/output/html_spec.js

@@ -9,6 +9,8 @@ describe('html output cell', () => {
     return new Component({
       propsData: {
         rawCode,
+        count: 0,
+        index: 0,
       },
     }).$mount();
   }

spec/javascripts/notebook/cells/output/index_spec.js

@@ -10,7 +10,7 @@ describe('Output component', () => {
   const createComponent = output => {
     vm = new Component({
       propsData: {
-        output,
+        outputs: [].concat(output),
         count: 1,
       },
     });
@@ -51,28 +51,21 @@ describe('Output component', () => {
     it('renders as an image', () => {
       expect(vm.$el.querySelector('img')).not.toBeNull();
     });
-
-    it('does not render the prompt', () => {
-      expect(vm.$el.querySelector('.prompt span')).toBeNull();
-    });
   });
 
   describe('html output', () => {
-    beforeEach(done => {
+    it('renders raw HTML', () => {
       createComponent(json.cells[4].outputs[0]);
 
-      setTimeout(() => {
-        done();
-      });
-    });
-
-    it('renders raw HTML', () => {
       expect(vm.$el.querySelector('p')).not.toBeNull();
-      expect(vm.$el.textContent.trim()).toBe('test');
+      expect(vm.$el.querySelectorAll('p').length).toBe(1);
+      expect(vm.$el.textContent.trim()).toContain('test');
     });
 
-    it('does not render the prompt', () => {
-      expect(vm.$el.querySelector('.prompt span')).toBeNull();
+    it('renders multiple raw HTML outputs', () => {
+      createComponent([json.cells[4].outputs[0], json.cells[4].outputs[0]]);
+
+      expect(vm.$el.querySelectorAll('p').length).toBe(2);
     });
   });
 
@@ -88,10 +81,6 @@ describe('Output component', () => {
     it('renders as an svg', () => {
       expect(vm.$el.querySelector('svg')).not.toBeNull();
     });
-
-    it('does not render the prompt', () => {
-      expect(vm.$el.querySelector('.prompt span')).toBeNull();
-    });
   });
 
   describe('default to plain text', () => {