Avoid unneeded castings

src/app_state.rs

@@ -52,8 +52,8 @@ pub enum CheckProgress {
 pub struct AppState {
     current_exercise_ind: usize,
     exercises: Vec<Exercise>,
-    // Caches the number of done exercises to avoid iterating over all exercises every time.
+    // Cache the number of done exercises to avoid iterating over all exercises every time.
-    n_done: u16,
+    n_done: u32,
     final_message: &'static str,
     state_file: File,
     // Preallocated buffer for reading and writing the state file.
@@ -191,13 +191,13 @@ impl AppState {
     }
 
     #[inline]
-    pub fn n_done(&self) -> u16 {
+    pub fn n_done(&self) -> u32 {
         self.n_done
     }
 
     #[inline]
-    pub fn n_pending(&self) -> u16 {
+    pub fn n_pending(&self) -> u32 {
-        self.exercises.len() as u16 - self.n_done
+        self.exercises.len() as u32 - self.n_done
     }
 
     #[inline]

src/list/state.rs

@@ -229,7 +229,7 @@ impl<'a> ListState<'a> {
             progress_bar(
                 &mut MaxLenWriter::new(stdout, self.term_width as usize),
                 self.app_state.n_done(),
-                self.app_state.exercises().len() as u16,
+                self.app_state.exercises().len() as u32,
                 self.term_width,
             )?;
             next_ln(stdout)?;

src/term.rs

@@ -193,8 +193,8 @@ impl Drop for ProgressCounter<'_, '_> {
 
 pub fn progress_bar<'a>(
     writer: &mut impl CountedWrite<'a>,
-    progress: u16,
+    progress: u32,
-    total: u16,
+    total: u32,
     term_width: u16,
 ) -> io::Result<()> {
     const PREFIX: &[u8] = b"Progress: [";
@@ -215,10 +215,9 @@ pub fn progress_bar<'a>(
     let stdout = writer.stdout();
     stdout.write_all(PREFIX)?;
 
-    let width = term_width - WRAPPER_WIDTH;
+    // Use u32 to prevent the intermediate multiplication from overflowing
-    // Use u32 to prevent the intermediate multiplication from overflowing u16
+    let width = u32::from(term_width - WRAPPER_WIDTH);
-    let filled = (width as u32 * progress as u32) / total as u32;
+    let filled = (width * progress) / total;
-    let filled = filled as u16;
 
     stdout.queue(SetForegroundColor(Color::Green))?;
     for _ in 0..filled {

src/watch/state.rs

@@ -245,7 +245,7 @@ impl<'a> WatchState<'a> {
         progress_bar(
             stdout,
             self.app_state.n_done(),
-            self.app_state.exercises().len() as u16,
+            self.app_state.exercises().len() as u32,
             self.term_width,
         )?;