Add cwd() and chdir() (#907)

1 files changed, 37 insertions, 0 deletions

diff --git a/js/dir.ts b/js/dir.ts
new file mode 100644
index 000000000..4bd3e6bd7
--- /dev/null
+++ b/js/dir.ts
@@ -0,0 +1,37 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import * as msg from "gen/msg_generated";
+import { assert } from "./util";
+import { flatbuffers } from "flatbuffers";
+import { sendSync } from "./dispatch";
+
+/**
+ * cwd() Return a string representing the current working directory.
+ * If the current directory can be reached via multiple paths
+ * (due to symbolic links), cwd() may return
+ * any one of them.
+ * throws NotFound exception if directory not available
+ */
+export function cwd(): string {
+  const builder = new flatbuffers.Builder(0);
+  msg.Cwd.startCwd(builder);
+  const inner = msg.Cwd.endCwd(builder);
+  const baseRes = sendSync(builder, msg.Any.Cwd, inner);
+  assert(baseRes != null);
+  assert(msg.Any.CwdRes === baseRes!.innerType());
+  const res = new msg.CwdRes();
+  assert(baseRes!.inner(res) != null);
+  return res.cwd()!;
+}
+
+/**
+ * chdir() Change the current working directory to path.
+ * throws NotFound exception if directory not available
+ */
+export function chdir(directory: string): void {
+  const builder = new flatbuffers.Builder();
+  const directory_ = builder.createString(directory);
+  msg.Chdir.startChdir(builder);
+  msg.Chdir.addDirectory(builder, directory_);
+  const inner = msg.Chdir.endChdir(builder);
+  sendSync(builder, msg.Any.Chdir, inner);
+}