Add prefix case for incrementFileName

src/vs/workbench/parts/files/electron-browser/fileActions.ts

@@ -1058,11 +1058,23 @@ function findValidPasteFileTarget(targetFolder: ExplorerItem, fileToPaste: { res
 	return candidate;
 }
 
-function incrementFileName(name: string, isFolder: boolean): string {
+export function incrementFileName(name: string, isFolder: boolean): string {
+	const separators = '[\\.\\-_]';
 
 	// file.1.txt=>file.2.txt
-	if (!isFolder && name.match(/(.*\.)(\d+)(\..*)$/)) {
-		return name.replace(/(.*\.)(\d+)(\..*)$/, (match, g1?, g2?, g3?) => { return g1 + (parseInt(g2) + 1) + g3; });
+	let suffixFileRegex = RegExp('(.*' + separators + ')(\\d+)(\\..*)$');
+	if (!isFolder && name.match(suffixFileRegex)) {
+		return name.replace(suffixFileRegex, (match, g1?, g2?, g3?) => {
+			return g1 + strings.pad(parseInt(g2) + 1, g2.length) + g3;
+		});
+	}
+
+	// 1.file.txt=>2.file.txt
+	let prefixFileRegex = RegExp('(\\d+)(' + separators + '.*)(\\..*)$');
+	if (!isFolder && name.match(prefixFileRegex)) {
+		return name.replace(prefixFileRegex, (match, g1?, g2?, g3?) => {
+			return strings.pad(parseInt(g1) + 1, g1.length) + g2 + g3;
+		});
 	}
 
 	// file.txt=>file.1.txt
@@ -1073,7 +1085,12 @@ function incrementFileName(name: string, isFolder: boolean): string {
 
 	// folder.1=>folder.2
 	if (isFolder && name.match(/(\d+)$/)) {
-		return name.replace(/(\d+)$/, (match: string, ...groups: any[]) => { return String(parseInt(groups[0]) + 1); });
+		return name.replace(/(\d+)$/, (match: string, ...groups: any[]) => { return strings.pad(parseInt(groups[0]) + 1, groups[0].length); });
+	}
+
+	// 1.folder=>2.folder
+	if (isFolder && name.match(/^(\d+)/)) {
+		return name.replace(/^(\d+)/, (match: string, ...groups: any[]) => { return strings.pad(parseInt(groups[0]) + 1, groups[0].length); });
 	}
 
 	// file/folder=>file.1/folder.1

src/vs/workbench/parts/files/test/electron-browser/fileActions.test.ts

@@ -0,0 +1,133 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as assert from 'assert';
+import { incrementFileName } from 'vs/workbench/parts/files/electron-browser/fileActions';
+
+suite('Files - Increment file name', () => {
+
+	test('Increment file name without any version', function () {
+		const name = 'test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.1.js');
+	});
+
+	test('Increment folder name without any version', function () {
+		const name = 'test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test.1');
+	});
+
+	test('Increment file name with suffix version', function () {
+		const name = 'test.1.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.2.js');
+	});
+
+	test('Increment file name with suffix version with trailing zeros', function () {
+		const name = 'test.001.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.002.js');
+	});
+
+	test('Increment file name with suffix version with trailing zeros, changing length', function () {
+		const name = 'test.009.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.010.js');
+	});
+
+	test('Increment file name with suffix version with `-` as separator', function () {
+		const name = 'test-1.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test-2.js');
+	});
+
+	test('Increment file name with suffix version with `-` as separator, trailing zeros', function () {
+		const name = 'test-001.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test-002.js');
+	});
+
+	test('Increment file name with suffix version with `-` as separator, trailing zeros, changnig length', function () {
+		const name = 'test-099.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test-100.js');
+	});
+
+	test('Increment file name with suffix version with `_` as separator', function () {
+		const name = 'test_1.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test_2.js');
+	});
+
+	test('Increment folder name with suffix version', function () {
+		const name = 'test.1';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test.2');
+	});
+
+	test('Increment folder name with suffix version, trailing zeros', function () {
+		const name = 'test.001';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test.002');
+	});
+
+	test('Increment folder name with suffix version with `-` as separator', function () {
+		const name = 'test-1';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test-2');
+	});
+
+	test('Increment folder name with suffix version with `_` as separator', function () {
+		const name = 'test_1';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test_2');
+	});
+
+	test('Increment file name with prefix version', function () {
+		const name = '1.test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, '2.test.js');
+	});
+
+	test('Increment file name with prefix version, trailing zeros', function () {
+		const name = '001.test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, '002.test.js');
+	});
+
+	test('Increment file name with prefix version with `-` as separator', function () {
+		const name = '1-test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, '2-test.js');
+	});
+
+	test('Increment file name with prefix version with `-` as separator', function () {
+		const name = '1_test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, '2_test.js');
+	});
+
+	test('Increment folder name with suffix version', function () {
+		const name = '1.test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, '2.test');
+	});
+
+	test('Increment folder name with suffix version, trailing zeros', function () {
+		const name = '001.test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, '002.test');
+	});
+
+	test('Increment folder name with suffix version  with `-` as separator', function () {
+		const name = '1-test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, '2-test');
+	});
+
+});