Version History (#768)

* Stash. Super rough progress

* Stash

* 'h' how toggles history panel
Add documents.restore endpoint

* Add tests for documents.restore endpoint

* Document restore endpoint

* Tiding, RevisionMenu, remove scroll dep

* Add history menu item

* Paginate loading

* Fixed: Error boundary styling
Select first revision faster

* Diff summary, styling

* Add history loading placeholder
Fix move modal not opening

* Fixes: Refreshing page on specific revision

* documentation for document.revision

* Better handle versions with no text changes (will no longer be created)

server/presenters/revision.js

@@ -1,13 +1,33 @@
 // @flow
+import * as JSDiff from 'diff';
 import { Revision } from '../models';
+import presentUser from './user';
+
+function counts(changes) {
+  return changes.reduce(
+    (acc, change) => {
+      if (change.added) acc.added += change.value.length;
+      if (change.removed) acc.removed += change.value.length;
+      return acc;
+    },
+    {
+      added: 0,
+      removed: 0,
+    }
+  );
+}
+
+function present(ctx: Object, revision: Revision, previous?: Revision) {
+  const prev = previous ? previous.text : '';
 
-function present(ctx: Object, revision: Revision) {
   return {
     id: revision.id,
+    documentId: revision.documentId,
     title: revision.title,
     text: revision.text,
     createdAt: revision.createdAt,
-    updatedAt: revision.updatedAt,
+    createdBy: presentUser(ctx, revision.user),
+    diff: counts(JSDiff.diffChars(prev, revision.text)),
   };
 }