Implement auxiliary blob viewers

1 files changed, 62 insertions, 37 deletions

diff --git a/app/assets/javascripts/blob/viewer/index.js b/app/assets/javascripts/blob/viewer/index.js
index 69ff2f95799..849da633c89 100644
--- a/app/assets/javascripts/blob/viewer/index.js
+++ b/app/assets/javascripts/blob/viewer/index.js
@@ -1,20 +1,38 @@
 /* global Flash */
 export default class BlobViewer {
   constructor() {
+    BlobViewer.initAuxiliaryViewer();
+
+    this.initMainViewers();
+  }
+
+  static initAuxiliaryViewer() {
+    const auxiliaryViewer = document.querySelector('.blob-viewer[data-type="auxiliary"]');
+    if (!auxiliaryViewer) return;
+
+    BlobViewer.loadViewer(auxiliaryViewer);
+  }
+
+  initMainViewers() {
+    this.$fileHolder = $('.file-holder');
+    if (!this.$fileHolder.length) return;
+
     this.switcher = document.querySelector('.js-blob-viewer-switcher');
     this.switcherBtns = document.querySelectorAll('.js-blob-viewer-switch-btn');
     this.copySourceBtn = document.querySelector('.js-copy-blob-source-btn');
-    this.simpleViewer = document.querySelector('.blob-viewer[data-type="simple"]');
-    this.richViewer = document.querySelector('.blob-viewer[data-type="rich"]');
-    this.$fileHolder = $('.file-holder');
 
-    const initialViewer = document.querySelector('.blob-viewer:not(.hidden)');
-    if (!initialViewer) return;
-
-    let initialViewerName = initialViewer.getAttribute('data-type');
+    this.simpleViewer = this.$fileHolder[0].querySelector('.blob-viewer[data-type="simple"]');
+    this.richViewer = this.$fileHolder[0].querySelector('.blob-viewer[data-type="rich"]');
 
     this.initBindings();
 
+    this.switchToInitialViewer();
+  }
+
+  switchToInitialViewer() {
+    const initialViewer = this.$fileHolder[0].querySelector('.blob-viewer:not(.hidden)');
+    let initialViewerName = initialViewer.getAttribute('data-type');
+
     if (this.switcher && location.hash.indexOf('#L') === 0) {
       initialViewerName = 'simple';
     }
@@ -64,40 +82,13 @@ export default class BlobViewer {
     $(this.copySourceBtn).tooltip('fixTitle');
   }
 
-  loadViewer(viewerParam) {
-    const viewer = viewerParam;
-    const url = viewer.getAttribute('data-url');
-
-    if (!url || viewer.getAttribute('data-loaded') || viewer.getAttribute('data-loading')) {
-      return;
-    }
-
-    viewer.setAttribute('data-loading', 'true');
-
-    $.ajax({
-      url,
-      dataType: 'JSON',
-    })
-    .fail(() => new Flash('Error loading source view'))
-    .done((data) => {
-      viewer.innerHTML = data.html;
-      $(viewer).syntaxHighlight();
-
-      viewer.setAttribute('data-loaded', 'true');
-
-      this.$fileHolder.trigger('highlight:line');
-
-      this.toggleCopyButtonState();
-    });
-  }
-
   switchToViewer(name) {
-    const newViewer = document.querySelector(`.blob-viewer[data-type='${name}']`);
+    const newViewer = this.$fileHolder[0].querySelector(`.blob-viewer[data-type='${name}']`);
     if (this.activeViewer === newViewer) return;
 
     const oldButton = document.querySelector('.js-blob-viewer-switch-btn.active');
     const newButton = document.querySelector(`.js-blob-viewer-switch-btn[data-viewer='${name}']`);
-    const oldViewer = document.querySelector(`.blob-viewer:not([data-type='${name}'])`);
+    const oldViewer = this.$fileHolder[0].querySelector(`.blob-viewer:not([data-type='${name}'])`);
 
     if (oldButton) {
       oldButton.classList.remove('active');
@@ -118,6 +109,40 @@ export default class BlobViewer {
 
     this.toggleCopyButtonState();
 
-    this.loadViewer(newViewer);
+    BlobViewer.loadViewer(newViewer)
+    .then((viewer) => {
+      $(viewer).syntaxHighlight();
+
+      this.$fileHolder.trigger('highlight:line');
+
+      this.toggleCopyButtonState();
+    })
+    .catch(() => new Flash('Error loading viewer'));
+  }
+
+  static loadViewer(viewerParam) {
+    const viewer = viewerParam;
+    const url = viewer.getAttribute('data-url');
+
+    return new Promise((resolve, reject) => {
+      if (!url || viewer.getAttribute('data-loaded') || viewer.getAttribute('data-loading')) {
+        resolve(viewer);
+        return;
+      }
+
+      viewer.setAttribute('data-loading', 'true');
+
+      $.ajax({
+        url,
+        dataType: 'JSON',
+      })
+      .fail(reject)
+      .done((data) => {
+        viewer.innerHTML = data.html;
+        viewer.setAttribute('data-loaded', 'true');
+
+        resolve(viewer);
+      });
+    });
   }
 }