Add a rot13 command

package.json

@@ -18,6 +18,7 @@
 	},
 	"activationEvents": [
 		"onCommand:recombobulator.base64",
+		"onCommand:recombobulator.rot13",
 		"onCommand:recombobulator.unbase64"
 	],
 	"contributes": {
@@ -27,6 +28,11 @@
 				"category": "Recombobulator",
 				"title": "base64 encode"
 			},
+			{
+				"command": "recombobulator.rot13",
+				"category": "Recombobulator",
+				"title": "rot13"
+			},
 			{
 				"command": "recombobulator.unbase64",
 				"category": "Recombobulator",
@@ -39,6 +45,10 @@
 					"command": "recombobulator.base64",
 					"when": "editorHasSelection"
 				},
+				{
+					"command": "recombobulator.rot13",
+					"when": "editorHasSelection"
+				},
 				{
 					"command": "recombobulator.unbase64",
 					"when": "editorHasSelection"

src/extension.ts

@@ -8,6 +8,12 @@ function unbase64(a: string) {
 	return Buffer.from(a, 'base64').toString("utf-8"); // TODO - handle different character encodings
 }
 
+function rot13(a: string) {
+	const alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+	const rotatedAlphabet = "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM";
+	return a.replace(/[a-zA-Z]/g, letter => rotatedAlphabet[alphabet.indexOf(letter)]);
+}
+
 function applyEdit(transform: Function) {
 	const editor = vscode.window.activeTextEditor;
 
@@ -31,6 +37,10 @@ export function activate(context: vscode.ExtensionContext) {
 		applyEdit(base64);
 		vscode.window.showInformationMessage('base64-encoded the selection!');
 	}));
+	context.subscriptions.push(vscode.commands.registerCommand('recombobulator.rot13', () => {
+		applyEdit(rot13);
+		vscode.window.showInformationMessage('rot13\'d the selection!');
+	}));
 	context.subscriptions.push(vscode.commands.registerCommand('recombobulator.unbase64', () => {
 		applyEdit(unbase64);
 		vscode.window.showInformationMessage('base64-decoded the selection!');