Implement deno.rename() (#731)

1 files changed, 42 insertions, 0 deletions

diff --git a/js/rename.ts b/js/rename.ts
new file mode 100644
index 000000000..241e27490
--- /dev/null
+++ b/js/rename.ts
@@ -0,0 +1,42 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import * as fbs from "gen/msg_generated";
+import { flatbuffers } from "flatbuffers";
+import * as dispatch from "./dispatch";
+
+/**
+ * Synchronously renames (moves) oldpath to newpath. If newpath already exists 
+ * and is not a directory, Rename replaces it. OS-specific restrictions may 
+ * apply when oldpath and newpath are in different directories.
+ *
+ *     import { renameSync } from "deno";
+ *     renameSync("old/path", "new/path");
+ */
+export function renameSync(oldpath: string, newpath: string): void {
+  dispatch.sendSync(...req(oldpath, newpath));
+}
+
+/**
+ * Renames (moves) oldpath to newpath. If newpath already exists 
+ * and is not a directory, Rename replaces it. OS-specific restrictions may 
+ * apply when oldpath and newpath are in different directories.
+ *
+ *     import { rename } from "deno";
+ *     await rename("old/path", "new/path");
+ */
+export async function rename(oldpath: string, newpath: string): Promise<void> {
+  await dispatch.sendAsync(...req(oldpath, newpath));
+}
+
+function req(
+  oldpath: string,
+  newpath: string
+): [flatbuffers.Builder, fbs.Any, flatbuffers.Offset] {
+  const builder = new flatbuffers.Builder();
+  const oldpath_ = builder.createString(oldpath);
+  const newpath_ = builder.createString(newpath);
+  fbs.Rename.startRename(builder);
+  fbs.Rename.addOldpath(builder, oldpath_);
+  fbs.Rename.addNewpath(builder, newpath_);
+  const msg = fbs.Rename.endRename(builder);
+  return [builder, fbs.Any.Rename, msg];
+}