chore: add SPDX license identifiers

cosmic-applet-battery/src/app.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 use crate::backend::{power_profile_subscription, Power, PowerProfileRequest, PowerProfileUpdate};
 use crate::backlight::{
     screen_backlight_subscription, ScreenBacklightRequest, ScreenBacklightUpdate,

cosmic-applet-battery/src/backend/mod.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 use cosmic::iced::{self, futures::SinkExt, subscription};
 use std::fmt::Debug;
 use std::hash::Hash;

cosmic-applet-battery/src/backlight.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 // TODO: use udev to monitor for brightness changes?
 // How should key bindings be handled? Need something like gnome-settings-daemon?
 

cosmic-applet-battery/src/config.rs

@@ -1 +1,4 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 pub const APP_ID: &str = "com.system76.CosmicAppletButton";

cosmic-applet-battery/src/dgpu.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 use std::{
     ffi::{OsStr, OsString},
     fmt::{self, Debug},

cosmic-applet-battery/src/lib.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 #[rustfmt::skip]
 mod backlight;
 mod app;

cosmic-applet-battery/src/localize.rs

@@ -1,4 +1,5 @@
-// SPDX-License-Identifier: MPL-2.0-only
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
 
 use i18n_embed::{
     fluent::{fluent_language_loader, FluentLanguageLoader},

cosmic-applet-battery/src/main.rs

@@ -1,3 +1,6 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 fn main() -> cosmic::iced::Result {