Add status code argument to exit command

Fixes #144.

package.json

@@ -1,6 +1,6 @@
 {
     "name": "fwdekker.com",
-    "version": "0.39.0",
+    "version": "0.39.1",
     "description": "The source code of [my personal website](https://fwdekker.com/).",
     "author": "Felix W. Dekker",
     "browser": "dist/bundle.js",

src/main/js/Commands.ts

@@ -535,12 +535,12 @@ return new Command(
 return new Command(
     (input, streams) => {
         josh.environment.set("user", "");
-        return ExitCode.OK;
+        return parseInt(input.args[0] || "0");
     },
     \`close session\`,
     \`exit\`,
     \`Closes the terminal session.\`,
-    new InputValidator({maxArgs: 0})
+    new InputValidator({minArgs: 0, maxArgs: 1})
 )`,
     "false": /* language=JavaScript */ `\
 return new Command(

src/test/Commands.spec.ts

@@ -360,10 +360,24 @@ describe("commands", () => {
             beforeEach(() => loadCommand("exit"));
 
 
-            it("changes the current user", () => {
+            it("removes the current user", () => {
+                environment.set("user", "wish");
+
                 expect(execute("exit")).to.equal(ExitCode.OK);
                 expect(environment.get("user")).to.equal("");
             });
+
+            it("has exit code of OK by default", () => {
+                environment.set("status", "9");
+
+                expect(execute("exit")).to.equal(ExitCode.OK);
+            });
+
+            it("returns the user-supplied exit code", () => {
+                environment.set("status", "1");
+
+                expect(execute("exit 46")).to.equal(46);
+            });
         });
 
         describe("false", () => {