From c907112fd35f567d8aca67f69da09369cfc2629b Mon Sep 17 00:00:00 2001
From: Alex Dima <alexdima@microsoft.com>
Date: Mon, 23 Jan 2017 16:26:58 +0100
Subject: [PATCH] Fixes #8574: Implement transpose letters command

---
 src/vs/editor/browser/editor.all.ts           |  3 +-
 .../caretOperations/common/transpose.ts       | 68 +++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 src/vs/editor/contrib/caretOperations/common/transpose.ts

diff --git a/src/vs/editor/browser/editor.all.ts b/src/vs/editor/browser/editor.all.ts
index c8a312373584d..9438ae2ad3a4b 100644
--- a/src/vs/editor/browser/editor.all.ts
+++ b/src/vs/editor/browser/editor.all.ts
@@ -10,6 +10,8 @@ import 'vs/editor/browser/widget/diffEditorWidget';
 
 import 'vs/editor/contrib/bracketMatching/common/bracketMatching';
 import 'vs/css!vs/editor/contrib/bracketMatching/browser/bracketMatching';
+import 'vs/editor/contrib/caretOperations/common/caretOperations';
+import 'vs/editor/contrib/caretOperations/common/transpose';
 import 'vs/editor/contrib/clipboard/browser/clipboard';
 import 'vs/editor/contrib/codelens/browser/codelens';
 import 'vs/editor/contrib/comment/common/comment';
@@ -24,7 +26,6 @@ import 'vs/css!vs/editor/contrib/inPlaceReplace/browser/inPlaceReplace';
 import 'vs/editor/contrib/inPlaceReplace/common/inPlaceReplace';
 import 'vs/editor/contrib/iPadShowKeyboard/browser/iPadShowKeyboard';
 import 'vs/editor/contrib/linesOperations/common/linesOperations';
-import 'vs/editor/contrib/caretOperations/common/caretOperations';
 import 'vs/editor/contrib/links/browser/links';
 import 'vs/editor/contrib/multicursor/common/multicursor';
 import 'vs/editor/contrib/multicursor/browser/menuPreventer';
diff --git a/src/vs/editor/contrib/caretOperations/common/transpose.ts b/src/vs/editor/contrib/caretOperations/common/transpose.ts
new file mode 100644
index 0000000000000..e4f9eab5c3725
--- /dev/null
+++ b/src/vs/editor/contrib/caretOperations/common/transpose.ts
@@ -0,0 +1,68 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 nls from 'vs/nls';
+import { KeyCode, KeyMod } from 'vs/base/common/keyCodes';
+import { Range } from 'vs/editor/common/core/range';
+import { ICommand, ICommonCodeEditor, EditorContextKeys } from 'vs/editor/common/editorCommon';
+import { editorAction, EditorAction, ServicesAccessor } from 'vs/editor/common/editorCommonExtensions';
+import { ReplaceCommand } from 'vs/editor/common/commands/replaceCommand';
+
+@editorAction
+class TransposeLettersAction extends EditorAction {
+
+	constructor() {
+		super({
+			id: 'editor.action.transposeLetters',
+			label: nls.localize('transposeLetters.label', "Transpose Letters"),
+			alias: 'Transpose Letters',
+			precondition: EditorContextKeys.Writable,
+			kbOpts: {
+				kbExpr: EditorContextKeys.TextFocus,
+				primary: 0,
+				mac: {
+					primary: KeyMod.WinCtrl | KeyCode.KEY_T
+				}
+			}
+		});
+	}
+
+	public run(accessor: ServicesAccessor, editor: ICommonCodeEditor): void {
+		let model = editor.getModel();
+		let commands: ICommand[] = [];
+		let selections = editor.getSelections();
+
+		for (let i = 0; i < selections.length; i++) {
+			let selection = selections[i];
+			if (!selection.isEmpty()) {
+				continue;
+			}
+			let lineNumber = selection.startLineNumber;
+			let column = selection.startColumn;
+			if (column === 1) {
+				// at the beginning of line
+				continue;
+			}
+			let maxColumn = model.getLineMaxColumn(lineNumber);
+			if (column === maxColumn) {
+				// at the end of line
+				continue;
+			}
+
+			let lineContent = model.getLineContent(lineNumber);
+			let charToTheLeft = lineContent.charAt(column - 2);
+			let charToTheRight = lineContent.charAt(column - 1);
+
+			let replaceRange = new Range(lineNumber, column - 1, lineNumber, column + 1);
+
+			commands.push(new ReplaceCommand(replaceRange, charToTheRight + charToTheLeft));
+		}
+
+		if (commands.length > 0) {
+			editor.executeCommands(this.id, commands);
+		}
+	}
+}