Desktop: Allow restoring a delete note from note history using command palette

.eslintignore

@@ -140,6 +140,9 @@ packages/app-desktop/commands/openProfileDirectory.js.map
 packages/app-desktop/commands/replaceMisspelling.d.ts
 packages/app-desktop/commands/replaceMisspelling.js
 packages/app-desktop/commands/replaceMisspelling.js.map
+packages/app-desktop/commands/restoreNoteRevision.d.ts
+packages/app-desktop/commands/restoreNoteRevision.js
+packages/app-desktop/commands/restoreNoteRevision.js.map
 packages/app-desktop/commands/startExternalEditing.d.ts
 packages/app-desktop/commands/startExternalEditing.js
 packages/app-desktop/commands/startExternalEditing.js.map

.gitignore

@@ -126,6 +126,9 @@ packages/app-desktop/commands/openProfileDirectory.js.map
 packages/app-desktop/commands/replaceMisspelling.d.ts
 packages/app-desktop/commands/replaceMisspelling.js
 packages/app-desktop/commands/replaceMisspelling.js.map
+packages/app-desktop/commands/restoreNoteRevision.d.ts
+packages/app-desktop/commands/restoreNoteRevision.js
+packages/app-desktop/commands/restoreNoteRevision.js.map
 packages/app-desktop/commands/startExternalEditing.d.ts
 packages/app-desktop/commands/startExternalEditing.js
 packages/app-desktop/commands/startExternalEditing.js.map

packages/app-desktop/app.ts

@@ -96,6 +96,7 @@ const globalCommands = [
 	require('./commands/stopExternalEditing'),
 	require('./commands/toggleExternalEditing'),
 	require('./commands/toggleSafeMode'),
+	require('./commands/restoreNoteRevision'),
 	require('@joplin/lib/commands/historyBackward'),
 	require('@joplin/lib/commands/historyForward'),
 	require('@joplin/lib/commands/synchronize'),

packages/app-desktop/commands/restoreNoteRevision.ts

@@ -0,0 +1,20 @@
+import { CommandRuntime, CommandDeclaration, CommandContext } from '@joplin/lib/services/CommandService';
+import RevisionService from '@joplin/lib/services/RevisionService';
+
+export const declaration: CommandDeclaration = {
+	name: 'restoreNoteRevision',
+	label: 'Restore a note from history',
+};
+
+export const runtime = (): CommandRuntime => {
+	return {
+		execute: async (_context: CommandContext, noteId: string, reverseRevIndex: number = 0) => {
+			try {
+				const note = await RevisionService.instance().restoreNoteById(noteId, reverseRevIndex);
+				alert(RevisionService.instance().restoreSuccessMessage(note));
+			} catch (error) {
+				alert(error.message);
+			}
+		},
+	};
+};

packages/app-desktop/gui/NoteRevisionViewer.jsx

@@ -13,7 +13,7 @@ const shared = require('@joplin/lib/components/shared/note-screen-shared.js');
 const { MarkupToHtml } = require('@joplin/renderer');
 const time = require('@joplin/lib/time').default;
 const ReactTooltip = require('react-tooltip');
-const { urlDecode, substrWithEllipsis } = require('@joplin/lib/string-utils');
+const { urlDecode } = require('@joplin/lib/string-utils');
 const bridge = require('electron').remote.require('./bridge').default;
 const markupLanguageUtils = require('../utils/markupLanguageUtils').default;
 
@@ -75,7 +75,7 @@ class NoteRevisionViewerComponent extends React.PureComponent {
 		this.setState({ restoring: true });
 		await RevisionService.instance().importRevisionNote(this.state.note);
 		this.setState({ restoring: false });
-		alert(_('The note "%s" has been successfully restored to the notebook "%s".', substrWithEllipsis(this.state.note.title, 0, 32), RevisionService.instance().restoreFolderTitle()));
+		alert(RevisionService.instance().restoreSuccessMessage(this.state.note));
 	}
 
 	backButton_click() {

packages/lib/services/RevisionService.ts

@@ -9,6 +9,7 @@ import shim from '../shim';
 import BaseService from './BaseService';
 import { _ } from '../locale';
 import { ItemChangeEntity, NoteEntity, RevisionEntity } from './database/types';
+const { substrWithEllipsis } = require('../string-utils');
 const { sprintf } = require('sprintf-js');
 const { wrapError } = require('../errorUtils');
 
@@ -230,7 +231,23 @@ export default class RevisionService extends BaseService {
 		return folder;
 	}
 
-	async importRevisionNote(note: NoteEntity) {
+	// reverseRevIndex = 0 means restoring the latest version. reverseRevIndex =
+	// 1 means the version before that, etc.
+	public async restoreNoteById(noteId: string, reverseRevIndex: number): Promise<NoteEntity> {
+		const revisions = await Revision.allByType(BaseModel.TYPE_NOTE, noteId);
+		if (!revisions.length) throw new Error(`No revision for note "${noteId}"`);
+
+		const revIndex = revisions.length - 1 - reverseRevIndex;
+
+		const note = await this.revisionNote(revisions, revIndex);
+		return this.importRevisionNote(note);
+	}
+
+	public restoreSuccessMessage(note: NoteEntity): string {
+		return _('The note "%s" has been successfully restored to the notebook "%s".', substrWithEllipsis(note.title, 0, 32), this.restoreFolderTitle());
+	}
+
+	async importRevisionNote(note: NoteEntity): Promise<NoteEntity> {
 		const toImport = Object.assign({}, note);
 		delete toImport.id;
 		delete toImport.updated_time;
@@ -242,7 +259,7 @@ export default class RevisionService extends BaseService {
 
 		toImport.parent_id = folder.id;
 
-		await Note.save(toImport);
+		return Note.save(toImport);
 	}
 
 	async maintenance() {