feat: add barcode scanner plugin (#536)

plugins/barcode-scanner/src/lib.rs

@@ -0,0 +1,53 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+#![cfg(mobile)]
+
+use tauri::{
+    plugin::{Builder, PluginHandle, TauriPlugin},
+    Manager, Runtime,
+};
+
+pub use models::*;
+
+mod error;
+mod models;
+
+pub use error::{Error, Result};
+
+#[cfg(target_os = "android")]
+const PLUGIN_IDENTIFIER: &str = "app.tauri.barcodescanner";
+
+#[cfg(target_os = "ios")]
+tauri::ios_plugin_binding!(init_plugin_barcode_scanner);
+
+/// Access to the scanner APIs.
+pub struct BarcodeScanner<R: Runtime>(PluginHandle<R>);
+
+impl<R: Runtime> BarcodeScanner<R> {}
+
+/// Extensions to [`tauri::App`], [`tauri::AppHandle`] and [`tauri::Window`] to access the barcode scanner APIs.
+pub trait BarcodeScannerExt<R: Runtime> {
+    fn barcode_scanner(&self) -> &BarcodeScanner<R>;
+}
+
+impl<R: Runtime, T: Manager<R>> crate::BarcodeScannerExt<R> for T {
+    fn barcode_scanner(&self) -> &BarcodeScanner<R> {
+        self.state::<BarcodeScanner<R>>().inner()
+    }
+}
+
+/// Initializes the plugin.
+pub fn init<R: Runtime>() -> TauriPlugin<R> {
+    Builder::new("barcodeScanner")
+        .setup(|app, api| {
+            #[cfg(target_os = "android")]
+            let handle = api.register_android_plugin(PLUGIN_IDENTIFIER, "BarcodeScannerPlugin")?;
+            #[cfg(target_os = "ios")]
+            let handle = api.register_ios_plugin(init_plugin_barcode_scanner)?;
+            app.manage(BarcodeScanner(handle));
+            Ok(())
+        })
+        .build()
+}