From 235dc61f473cb7f02a9453a59fb26d293e05b092 Mon Sep 17 00:00:00 2001
From: GitLab Bot <gitlab-bot@gitlab.com>
Date: Fri, 19 Jun 2020 12:09:07 +0000
Subject: Add latest changes from gitlab-org/gitlab@master

---
 app/assets/javascripts/blob_edit/constants.js |  4 ++
 app/assets/javascripts/blob_edit/edit_blob.js | 71 +++++++++++++++++++++------
 2 files changed, 60 insertions(+), 15 deletions(-)
 create mode 100644 app/assets/javascripts/blob_edit/constants.js

(limited to 'app/assets/javascripts/blob_edit')

diff --git a/app/assets/javascripts/blob_edit/constants.js b/app/assets/javascripts/blob_edit/constants.js
new file mode 100644
index 00000000000..a19da2098cf
--- /dev/null
+++ b/app/assets/javascripts/blob_edit/constants.js
@@ -0,0 +1,4 @@
+import { __ } from '~/locale';
+
+export const BLOB_EDITOR_ERROR = __('An error occurred while rendering the editor');
+export const BLOB_PREVIEW_ERROR = __('An error occurred previewing the blob');
diff --git a/app/assets/javascripts/blob_edit/edit_blob.js b/app/assets/javascripts/blob_edit/edit_blob.js
index 011898a5e7a..a725b3fe5d6 100644
--- a/app/assets/javascripts/blob_edit/edit_blob.js
+++ b/app/assets/javascripts/blob_edit/edit_blob.js
@@ -3,39 +3,75 @@
 import $ from 'jquery';
 import axios from '~/lib/utils/axios_utils';
 import createFlash from '~/flash';
-import { __ } from '~/locale';
+import { BLOB_EDITOR_ERROR, BLOB_PREVIEW_ERROR } from './constants';
 import TemplateSelectorMediator from '../blob/file_template_mediator';
 import getModeByFileExtension from '~/lib/utils/ace_utils';
 import { addEditorMarkdownListeners } from '~/lib/utils/text_markdown';
 
+const monacoEnabled = window?.gon?.features?.monacoBlobs;
+
 export default class EditBlob {
   // The options object has:
   // assetsPath, filePath, currentAction, projectId, isMarkdown
   constructor(options) {
     this.options = options;
-    this.configureAceEditor();
-    this.initModePanesAndLinks();
-    this.initSoftWrap();
-    this.initFileSelectors();
+    const { isMarkdown } = this.options;
+    Promise.resolve()
+      .then(() => {
+        return monacoEnabled ? this.configureMonacoEditor() : this.configureAceEditor();
+      })
+      .then(() => {
+        this.initModePanesAndLinks();
+        this.initFileSelectors();
+        this.initSoftWrap();
+        if (isMarkdown) {
+          addEditorMarkdownListeners(this.editor);
+        }
+        this.editor.focus();
+      })
+      .catch(() => createFlash(BLOB_EDITOR_ERROR));
+  }
+
+  configureMonacoEditor() {
+    return import(/* webpackChunkName: 'monaco_editor_lite' */ '~/editor/editor_lite').then(
+      EditorModule => {
+        const EditorLite = EditorModule.default;
+        const editorEl = document.getElementById('editor');
+        const fileNameEl =
+          document.getElementById('file_path') || document.getElementById('file_name');
+        const fileContentEl = document.getElementById('file-content');
+        const form = document.querySelector('.js-edit-blob-form');
+
+        this.editor = new EditorLite();
+
+        this.editor.createInstance({
+          el: editorEl,
+          blobPath: fileNameEl.value,
+          blobContent: editorEl.innerText,
+        });
+
+        fileNameEl.addEventListener('change', () => {
+          this.editor.updateModelLanguage(fileNameEl.value);
+        });
+
+        form.addEventListener('submit', () => {
+          fileContentEl.value = this.editor.getValue();
+        });
+      },
+    );
   }
 
   configureAceEditor() {
-    const { filePath, assetsPath, isMarkdown } = this.options;
+    const { filePath, assetsPath } = this.options;
     ace.config.set('modePath', `${assetsPath}/ace`);
     ace.config.loadModule('ace/ext/searchbox');
     ace.config.loadModule('ace/ext/modelist');
 
     this.editor = ace.edit('editor');
 
-    if (isMarkdown) {
-      addEditorMarkdownListeners(this.editor);
-    }
-
     // This prevents warnings re: automatic scrolling being logged
     this.editor.$blockScrolling = Infinity;
 
-    this.editor.focus();
-
     if (filePath) {
       this.editor.getSession().setMode(getModeByFileExtension(filePath));
     }
@@ -81,7 +117,7 @@ export default class EditBlob {
           currentPane.empty().append(data);
           currentPane.renderGFM();
         })
-        .catch(() => createFlash(__('An error occurred previewing the blob')));
+        .catch(() => createFlash(BLOB_PREVIEW_ERROR));
     }
 
     this.$toggleButton.show();
@@ -90,14 +126,19 @@ export default class EditBlob {
   }
 
   initSoftWrap() {
-    this.isSoftWrapped = false;
+    this.isSoftWrapped = Boolean(monacoEnabled);
     this.$toggleButton = $('.soft-wrap-toggle');
+    this.$toggleButton.toggleClass('soft-wrap-active', this.isSoftWrapped);
     this.$toggleButton.on('click', () => this.toggleSoftWrap());
   }
 
   toggleSoftWrap() {
     this.isSoftWrapped = !this.isSoftWrapped;
     this.$toggleButton.toggleClass('soft-wrap-active', this.isSoftWrapped);
-    this.editor.getSession().setUseWrapMode(this.isSoftWrapped);
+    if (monacoEnabled) {
+      this.editor.updateOptions({ wordWrap: this.isSoftWrapped ? 'on' : 'off' });
+    } else {
+      this.editor.getSession().setUseWrapMode(this.isSoftWrapped);
+    }
   }
 }
-- 
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