Handle the case when all exercises are done

src/run.rs

@@ -1,6 +1,6 @@
 use anyhow::{bail, Result};
 use crossterm::style::Stylize;
-use std::io::{stdout, Write};
+use std::io::{self, Write};
 
 use crate::app_state::{AppState, ExercisesProgress};
 
@@ -8,28 +8,24 @@ pub fn run(app_state: &mut AppState) -> Result<()> {
     let exercise = app_state.current_exercise();
     let output = exercise.run()?;
 
-    {
-        let mut stdout = stdout().lock();
-        stdout.write_all(&output.stdout)?;
-        stdout.write_all(&output.stderr)?;
-        stdout.flush()?;
-    }
+    let mut stdout = io::stdout().lock();
+    stdout.write_all(&output.stdout)?;
+    stdout.write_all(b"\n")?;
+    stdout.write_all(&output.stderr)?;
+    stdout.flush()?;
 
     if !output.status.success() {
         bail!("Ran {exercise} with errors");
     }
 
-    println!(
+    stdout.write_fmt(format_args!(
         "{}{}",
         "✓ Successfully ran ".green(),
         exercise.path.to_string_lossy().green(),
-    );
+    ))?;
 
-    match app_state.done_current_exercise()? {
-        ExercisesProgress::AllDone => println!(
-            "🎉 Congratulations! You have done all the exercises!
-🔚 There are no more exercises to do next!"
-        ),
+    match app_state.done_current_exercise(&mut stdout)? {
+        ExercisesProgress::AllDone => (),
         ExercisesProgress::Pending => println!("Next exercise: {}", app_state.current_exercise()),
     }