Adds a move method which won't actually work until that feature is added to browsers whatwg/fs#10

Author: Isaiah Becker-Mayer

packages/teleport/src/lib/tdp/sharedDirectoryManager.ts

@@ -66,7 +66,7 @@ export class SharedDirectoryManager {
   /**
    * Gets the FileOrDirInfo for all the children of the directory at path.
    * @throws Will throw an error if a directory has not already been initialized via add().
-   * @throws {PathDoesNotExistError} if the pathstr isn't a valid path in the shared directory
+   * @throws {PathDoesNotExistError} if the path isn't a valid path in the shared directory
    */
   async listContents(path: string): Promise<FileOrDirInfo[]> {
     this.checkReady();
@@ -119,7 +119,7 @@ export class SharedDirectoryManager {
   /**
    * Writes the bytes in writeData to the file at path starting at offset.
    * @throws Will throw an error if a directory has not already been initialized via add().
-   * @throws {PathDoesNotExistError} if the pathstr isn't a valid path in the shared directory
+   * @throws {PathDoesNotExistError} if the path isn't a valid path in the shared directory
    */
   async writeFile(
     path: string,
@@ -143,6 +143,29 @@ export class SharedDirectoryManager {
     return writeData.length;
   }
 
+  /**
+   * Moves the file or directory at originalPath to newPath. It's designed to work similar to
+   * the Linux mv utility with no options: https://linux.die.net/man/1/mv.
+   * @throws Will throw an error if a directory has not already been initialized via add().
+   * @throws {PathDoesNotExistError} if the path isn't a valid path in the shared directory
+   */
+  async move(originalPath: string, newPath: string): Promise<void> {
+    // See https://web.dev/file-system-access/#renaming-and-moving-files-and-folders
+    this.checkReady();
+
+    const originalFileOrDir = await this.walkPath(originalPath);
+
+    let split = newPath.split('/');
+    const newName = split.pop();
+    const newDirPath = split.join('/');
+    const newDir = await this.walkPath(newDirPath);
+    if (newDir.kind !== 'directory') {
+      throw new Error('cannot move a file into another file');
+    }
+
+    await originalFileOrDir.move(newDir, newName);
+  }
+
   /**
    * walkPath walks a pathstr (assumed to be in the qualified Unix format specified
    * in the TDP spec), returning the FileSystemDirectoryHandle | FileSystemFileHandle