style: rename rustfmt config and sync edition with 2021

examples/limit_settings.rs

@@ -66,15 +66,15 @@ fn main() {
     println!("Example 5: Comparing different limiting scenarios");
 
     let gentle_limiting = LimitSettings::default()
-        .with_threshold(-6.0)           // Higher threshold (less limiting)
-        .with_knee_width(8.0)           // Wide knee (softer)
-        .with_attack(Duration::from_millis(20))    // Slower attack
+        .with_threshold(-6.0) // Higher threshold (less limiting)
+        .with_knee_width(8.0) // Wide knee (softer)
+        .with_attack(Duration::from_millis(20)) // Slower attack
         .with_release(Duration::from_millis(200)); // Slower release
 
     let aggressive_limiting = LimitSettings::default()
-        .with_threshold(-1.0)           // Lower threshold (more limiting)
-        .with_knee_width(1.0)           // Narrow knee (harder)
-        .with_attack(Duration::from_millis(2))    // Fast attack
+        .with_threshold(-1.0) // Lower threshold (more limiting)
+        .with_knee_width(1.0) // Narrow knee (harder)
+        .with_attack(Duration::from_millis(2)) // Fast attack
         .with_release(Duration::from_millis(20)); // Fast release
 
     println!("  Gentle limiting:");
@@ -109,8 +109,8 @@ fn main() {
     // Apply limiting with -6dB threshold (should limit to ~0.5)
     let strict_limiting = LimitSettings::default()
         .with_threshold(-6.0)
-        .with_knee_width(0.5)                     // Narrow knee for precise limiting
-        .with_attack(Duration::from_millis(3))    // Fast attack
+        .with_knee_width(0.5) // Narrow knee for precise limiting
+        .with_attack(Duration::from_millis(3)) // Fast attack
         .with_release(Duration::from_millis(12)); // Moderate release
 
     let limited_sine = test_sine.limit(strict_limiting.clone());

rustfmt.toml

@@ -0,0 +1 @@
+edition = "2021"

src/sink.rs

@@ -138,7 +138,8 @@ impl Sink {
                         *to_clear -= 1;
                         *controls.position.lock().unwrap() = Duration::ZERO;
                     } else {
-                        *controls.position.lock().unwrap() = src.inner().inner().inner().inner().get_pos();
+                        *controls.position.lock().unwrap() =
+                            src.inner().inner().inner().inner().get_pos();
                     }
                 }
                 let amp = src.inner_mut().inner_mut();

src/source/limit.rs

@@ -257,8 +257,8 @@ impl LimitSettings {
     #[inline]
     pub fn broadcast() -> Self {
         Self::default()
-            .with_knee_width(2.0)                    // Narrower knee for decisive limiting
-            .with_attack(Duration::from_millis(3))   // Faster attack for transients
+            .with_knee_width(2.0) // Narrower knee for decisive limiting
+            .with_attack(Duration::from_millis(3)) // Faster attack for transients
             .with_release(Duration::from_millis(50)) // Faster recovery for consistency
     }
 

tests/limit.rs

@@ -10,7 +10,7 @@ fn test_limiting_works() {
         .take_duration(Duration::from_millis(60)); // ~2600 samples
 
     let settings = rodio::source::LimitSettings::default()
-        .with_threshold(-6.0)   // -6dB = ~0.5 linear
+        .with_threshold(-6.0) // -6dB = ~0.5 linear
         .with_knee_width(0.5)
         .with_attack(Duration::from_millis(3))
         .with_release(Duration::from_millis(12));