fix: add methods to import data (#3)

In order to have a more consistent developer experience, wrap the `ipfs-unixfs-importer` methods to allow adding data from the `UnixFS` interface.

src/commands/add.ts

@@ -0,0 +1,34 @@
+import type { CID } from 'multiformats/cid'
+import type { Blockstore } from 'interface-blockstore'
+import { ByteStream, DirectoryCandidate, FileCandidate, importBytes, importByteStream, ImportCandidateStream, importDirectory, importer, ImporterOptions, importFile, ImportResult } from 'ipfs-unixfs-importer'
+
+export async function * addAll (source: ImportCandidateStream, blockstore: Blockstore, options: Partial<ImporterOptions> = {}): AsyncGenerator<ImportResult, void, unknown> {
+  yield * importer(source, blockstore, options)
+}
+
+export async function addBytes (bytes: Uint8Array, blockstore: Blockstore, options: Partial<ImporterOptions> = {}): Promise<CID> {
+  const { cid } = await importBytes(bytes, blockstore, options)
+
+  return cid
+}
+
+export async function addByteStream (bytes: ByteStream, blockstore: Blockstore, options: Partial<ImporterOptions> = {}): Promise<CID> {
+  const { cid } = await importByteStream(bytes, blockstore, options)
+
+  return cid
+}
+
+export async function addFile (file: FileCandidate, blockstore: Blockstore, options: Partial<ImporterOptions> = {}): Promise<CID> {
+  const { cid } = await importFile(file, blockstore, options)
+
+  return cid
+}
+
+export async function addDirectory (dir: Partial<DirectoryCandidate>, blockstore: Blockstore, options: Partial<ImporterOptions> = {}): Promise<CID> {
+  const { cid } = await importDirectory({
+    ...dir,
+    path: dir.path ?? '-'
+  }, blockstore, options)
+
+  return cid
+}