Add XML Formatter

src/features/xmlFormatting.ts

@@ -0,0 +1,22 @@
+'use strict';
+
+import { TextEditor, TextEditorEdit, TextDocument, Position, Range } from 'vscode';
+
+let pd = require('pretty-data').pd;
+
+export function formatXml(editor: TextEditor, edit: TextEditorEdit): void {
+	let current = editor.document.getText();
+	let pretty = pd.xml(current);
+	
+	// get the range for the entire document
+	let lastLineIndex = (editor.document.lineCount - 1);
+	let lastLine = editor.document.lineAt(lastLineIndex);
+	let lastPosition = lastLine.rangeIncludingLineBreak.end;
+	let range = new Range(new Position(0, 0), lastPosition);
+	
+	// validate the range to ensure it fits inside the document
+	range = editor.document.validateRange(range);
+	
+	// replace the existing xml with the pretty xml
+	edit.replace(range, pretty);
+}