Desktop: Improved: Add number of characters removed and added in revision list

CliClient/tests/models_Revision.js

@@ -68,4 +68,37 @@ describe('models_Revision', function() {
 		expect(newRevs[2].id).toBe('789');
 	}));
 
+	it('should create patch stats', asyncTest(async () => {
+		const tests = [
+			{
+				patch: `@@ -625,16 +625,48 @@
+ rrupted download
++%0A- %5B %5D Fix mobile screen options`,
+				expected: [-0, +32],
+			},
+			{
+				patch: `@@ -564,17 +564,17 @@
+ ages%0A- %5B
+- 
++x
+ %5D Check `,
+ 				expected: [-1, +1],
+ 			},
+ 			{
+ 				patch: `@@ -1022,56 +1022,415 @@
+ .%0A%0A#
+- How to view a note history%0A%0AWhile all the apps 
++%C2%A0How does it work?%0A%0AAll the apps save a version of the modified notes every 10 minutes.
+ %0A%0A# `,
+ 				expected: [-(19+27+2), 17+67+4],
+ 			},
+		];
+
+		for (const test of tests) {
+			const stats = Revision.patchStats(test.patch);
+			expect(stats.removed).toBe(-test.expected[0]);
+			expect(stats.added).toBe(test.expected[1]);
+		}
+	}));
+
 });

ElectronClient/app/gui/NoteRevisionViewer.jsx

@@ -126,10 +126,12 @@ class NoteRevisionViewerComponent extends React.PureComponent {
 		const revs = this.state.revisions.slice().reverse();
 		for (let i = 0; i < revs.length; i++) {
 			const rev = revs[i];
+			const stats = Revision.revisionPatchStatsText(rev);
+
 			revisionListItems.push(<option
 				key={rev.id}
 				value={rev.id}
-			>{time.formatMsToLocal(rev.item_updated_time)}</option>);
+			>{time.formatMsToLocal(rev.item_updated_time) + ' (' + stats + ')'}</option>);
 		}
 
 		const restoreButtonTitle = _('Restore');

ReactNativeClient/lib/models/Revision.js

@@ -69,6 +69,49 @@ class Revision extends BaseItem {
 		return output;
 	}
 
+	static patchStats(patch) {
+		if (typeof patch === 'object') throw new Error('Not implemented');
+
+		const countChars = diffLine => {
+			return unescape(diffLine).length - 1;
+		}
+
+		const lines = patch.split('\n');
+		let added = 0;
+		let removed = 0;
+
+		for (const line of lines) {
+			if (line.indexOf('-') === 0) {
+				removed += countChars(line);
+				continue;
+			}
+
+			if (line.indexOf('+') === 0) {
+				added += countChars(line);
+				continue;
+			}
+		}
+
+		return {
+			added: added,
+			removed: removed,
+		};
+	}
+
+	static revisionPatchStatsText(rev) {
+		const titleStats = this.patchStats(rev.title_diff);
+		const bodyStats = this.patchStats(rev.body_diff);
+		const total = {
+			added: titleStats.added + bodyStats.added,
+			removed: titleStats.removed + bodyStats.removed,
+		};
+
+		const output = [];
+		if (total.removed) output.push('-' + total.removed);
+		output.push('+' + total.added);
+		return output.join(', ');
+	}
+
 	static async countRevisions(itemType, itemId) {
 		const r = await this.db().selectOne('SELECT count(*) as total FROM revisions WHERE item_type = ? AND item_id = ?', [
 			itemType,