Add filestorage adapters

src/lib/storage/zappers.ts

@@ -0,0 +1,41 @@
+import {getAllFromFile, type FilesystemStorageProvider} from "@lib/storage"
+import {get, type Unsubscriber} from "svelte/store"
+import {Filesystem, Directory, Encoding} from "@capacitor/filesystem"
+import {onZapper, zappers} from "@welshman/app"
+import {batch} from "@welshman/lib"
+import type {Zapper} from "@welshman/util"
+
+export class ZappersStorageProvider implements FilesystemStorageProvider {
+  static filepath = "zappers.json"
+  static directory = Directory.Data
+  static encoding = Encoding.UTF8
+
+  async initializeState(): Promise<void> {
+    zappers.set(await this.getAll())
+  }
+
+  sync(): Unsubscriber {
+    return onZapper(batch(300, () => this.saveState()))
+  }
+
+  async getAll(): Promise<Zapper[]> {
+    return await getAllFromFile(ZappersStorageProvider.filepath, ZappersStorageProvider.directory, ZappersStorageProvider.encoding)
+  }
+
+  async writeAll(zappers: Zapper[]) {
+    await Filesystem.writeFile({
+      path: ZappersStorageProvider.filepath,
+      directory: ZappersStorageProvider.directory,
+      encoding: ZappersStorageProvider.encoding,
+      data: JSON.stringify(zappers),
+    })
+  }
+
+  async saveState() {
+    await this.writeAll(get(zappers))
+  }
+
+  static async clearStorage(): Promise<void> {
+    await Filesystem.deleteFile({path: ZappersStorageProvider.filepath, directory: ZappersStorageProvider.directory})
+  }
+}