feat: add $.cd

dzx.ts

@@ -10,6 +10,7 @@ $._stack = [];
 $.shell = "/bin/sh";
 $.verbose = false;
 $.cwd = Deno.cwd();
+$.cd = cd;
 
 window.$ = $;
 
@@ -105,3 +106,28 @@ async function read(
     }
   }
 }
+
+export function cd(path: string) {
+  if ($.verbose) {
+    console.log($.brightBlue("$ %s"), `cd ${path}`);
+  }
+
+  try {
+    Deno.lstatSync(path);
+  } catch (error) {
+    if (error instanceof Deno.errors.NotFound) {
+      const stack: string = (new Error().stack!.split("at ")[2]).trim();
+      console.error(`cd: ${path}: No such directory`);
+      console.error(`  at ${stack}`);
+      Deno.exit(1);
+    } else if (error instanceof Deno.errors.PermissionDenied) {
+      const stack: string = (new Error().stack!.split("at ")[2]).trim();
+      console.error(`cd: ${path}: Permission denied`);
+      console.error(`  at ${stack}`);
+      Deno.exit(1);
+    }
+    throw error;
+  }
+
+  $.cwd = path;
+}

types.d.ts

@@ -5,6 +5,7 @@ type DZX = typeof exec & typeof colors & {
   verbose: boolean;
   cwd: string;
   shell: string;
+  cd: (path: string) => void;
 };
 
 declare global {