From 5e207c4a60019f4df187510682d83a0597df2468 Mon Sep 17 00:00:00 2001
From: streamich <streamich@gmail.com>
Date: Sat, 17 Jun 2023 20:14:11 +0200
Subject: [PATCH] =?UTF-8?q?feat:=20=F0=9F=8E=B8=20add=20copyFile()=20metho?=
 =?UTF-8?q?d?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/fsa-to-node/FsaNodeFs.ts                | 33 +++++++++++++++++----
 src/fsa-to-node/__tests__/FsaNodeFs.test.ts | 13 ++++++++
 2 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/src/fsa-to-node/FsaNodeFs.ts b/src/fsa-to-node/FsaNodeFs.ts
index d72962a53..0a02a66c1 100644
--- a/src/fsa-to-node/FsaNodeFs.ts
+++ b/src/fsa-to-node/FsaNodeFs.ts
@@ -251,11 +251,34 @@ export class FsaNodeFs implements FsCallbackApi, FsCommonObjects {
     throw new Error('Not implemented');
   }
 
-  copyFile(src: misc.PathLike, dest: misc.PathLike, callback: misc.TCallback<void>);
-  copyFile(src: misc.PathLike, dest: misc.PathLike, flags: misc.TFlagsCopy, callback: misc.TCallback<void>);
-  copyFile(src: misc.PathLike, dest: misc.PathLike, a, b?) {
-    throw new Error('Not implemented');
-  }
+  public readonly copyFile: FsCallbackApi['copyFile'] = (src: misc.PathLike, dest: misc.PathLike, a, b?): void => {
+    const srcFilename = pathToFilename(src);
+    const destFilename = pathToFilename(dest);
+    let flags: misc.TFlagsCopy;
+    let callback: misc.TCallback<void>;
+    if (typeof a === 'function') {
+      flags = 0;
+      callback = a;
+    } else {
+      flags = a;
+      callback = b;
+    }
+    validateCallback(callback);
+    const [oldFolder, oldName] = pathToLocation(srcFilename);
+    const [newFolder, newName] = pathToLocation(destFilename);
+    (async () => {
+      const oldFile = await this.getFile(oldFolder, oldName, 'copyFile');
+      const newDir = await this.getDir(newFolder, false, 'copyFile');
+      const newFile = await newDir.getFileHandle(newName, { create: true });
+      const writable = await newFile.createWritable({ keepExistingData: false });
+      const oldData = await oldFile.getFile();
+      await writable.write(await oldData.arrayBuffer());
+      await writable.close();
+    })().then(
+      () => callback(null),
+      error => callback(error),
+    );
+  };
 
   public readonly unlink: FsCallbackApi['unlink'] = (path: misc.PathLike, callback: misc.TCallback<void>): void => {
     const filename = pathToFilename(path);
diff --git a/src/fsa-to-node/__tests__/FsaNodeFs.test.ts b/src/fsa-to-node/__tests__/FsaNodeFs.test.ts
index d5be9f47f..295a45762 100644
--- a/src/fsa-to-node/__tests__/FsaNodeFs.test.ts
+++ b/src/fsa-to-node/__tests__/FsaNodeFs.test.ts
@@ -547,3 +547,16 @@ describe('.realpath()', () => {
     expect(path).toBe('/folder/file');
   });
 });
+
+describe('.copyFile()', () => {
+  test('can copy a file', async () => {
+    const { fs, mfs } = setup({ folder: { file: 'test' }, 'empty-folder': null, 'f.html': 'test' });
+    await fs.promises.copyFile('/folder/file', '/folder/file2');
+    expect(mfs.__vol.toJSON()).toStrictEqual({
+      '/mountpoint/folder/file': 'test',
+      '/mountpoint/folder/file2': 'test',
+      '/mountpoint/empty-folder': null,
+      '/mountpoint/f.html': 'test',
+    });
+  });
+});