Clear screen and reset cursor on power command.

src/main.rs

@@ -20,6 +20,7 @@ use crossterm::{
 };
 use event::Event;
 use greetd_ipc::Request;
+use power::PowerPostAction;
 use tokio::sync::RwLock;
 use tracing_appender::non_blocking::WorkerGuard;
 use tui::{backend::CrosstermBackend, Terminal};
@@ -100,12 +101,21 @@ async fn run() -> Result<(), Box<dyn Error>> {
       }
 
       Some(Event::PowerCommand(command)) => {
-        power::run(&greeter, command).await;
+        if let PowerPostAction::ClearScreen = power::run(&greeter, command).await {
+          execute!(io::stdout(), LeaveAlternateScreen)?;
+          terminal.set_cursor(1, 1)?;
+          terminal.clear()?;
+          disable_raw_mode()?;
+
+          break;
+        }
       }
 
       _ => {}
     }
   }
+
+  Ok(())
 }
 
 async fn exit(greeter: &mut Greeter, status: AuthStatus) {

src/power.rs

@@ -60,7 +60,12 @@ pub async fn power(greeter: &mut Greeter, option: PowerOption) {
   }
 }
 
-pub async fn run(greeter: &Arc<RwLock<Greeter>>, mut command: Command) {
+pub enum PowerPostAction {
+  Noop,
+  ClearScreen,
+}
+
+pub async fn run(greeter: &Arc<RwLock<Greeter>>, mut command: Command) -> PowerPostAction {
   tracing::info!("executing power command: {:?}", command);
 
   greeter.write().await.mode = Mode::Processing;
@@ -85,6 +90,12 @@ pub async fn run(greeter: &Arc<RwLock<Greeter>>, mut command: Command) {
 
   let mut greeter = greeter.write().await;
 
-  greeter.mode = mode;
-  greeter.message = message;
+  if message.is_none() {
+    PowerPostAction::ClearScreen
+  } else {
+    greeter.mode = mode;
+    greeter.message = message;
+
+    PowerPostAction::Noop
+  }
 }