Clean up some formatting.

src/bin/ferry.rs

@@ -20,7 +20,7 @@ impl FerryLocation {
 impl TryFrom<char> for FerryLocation {
     type Error = MapParseError;
 
-    fn try_from(c: char) -> Result<Self,Self::Error> {
+    fn try_from(c: char) -> Result<Self, Self::Error> {
         match c {
             '.' => Ok(FerryLocation::Floor),
             'L' => Ok(FerryLocation::EmptySeat),
@@ -51,8 +51,8 @@ impl From<Map<FerryLocation>> for EvolvingMap {
         EvolvingMap {
             next_map: Some(start_map),
             occupation_tolerance: 4,
-            view: |m, x, y| { m.adjacents(x, y) },
-         }
+            view: |m, x, y| m.adjacents(x, y),
+        }
     }
 }
 
@@ -64,7 +64,11 @@ impl Iterator for EvolvingMap {
         let mut next_map = current_map.clone();
 
         for (x, y, value) in current_map.locations() {
-            let occupied_neighbors = (self.view)(&current_map, x, y).ok()?.iter().filter(|x| **x == FerryLocation::TakenSeat).count();
+            let occupied_neighbors = (self.view)(&current_map, x, y)
+                .ok()?
+                .iter()
+                .filter(|x| **x == FerryLocation::TakenSeat)
+                .count();
             match value {
                 FerryLocation::EmptySeat if occupied_neighbors == 0 => {
                     next_map.set(x, y, FerryLocation::TakenSeat).ok()?;
@@ -86,7 +90,7 @@ impl Iterator for EvolvingMap {
     }
 }
 
-fn main() -> Result<(),TopLevelError> {
+fn main() -> Result<(), TopLevelError> {
     let filename = env::args().nth(1).expect("No file argument given.");
     let contents = fs::read_to_string(filename)?;
     let map = Map::<FerryLocation>::try_from(contents.as_str())?;
@@ -96,19 +100,25 @@ fn main() -> Result<(),TopLevelError> {
     for (idx, step) in base_evolving_map.enumerate() {
         println!("Base map, step #{}", idx);
         step.print();
-        println!("# of occupied seats: {}\n", step.count(FerryLocation::TakenSeat));
+        println!(
+            "# of occupied seats: {}\n",
+            step.count(FerryLocation::TakenSeat)
+        );
     }
 
     // part 2
     let view_evolving_map = EvolvingMap {
         next_map: Some(map),
         occupation_tolerance: 5,
-        view: |m,x,y| m.adjacents_until(x, y, FerryLocation::is_seat),
+        view: |m, x, y| m.adjacents_until(x, y, FerryLocation::is_seat),
     };
     for (idx, step) in view_evolving_map.enumerate() {
         println!("Extended map, step #{}", idx);
         step.print();
-        println!("# of occupied seats: {}\n", step.count(FerryLocation::TakenSeat));
+        println!(
+            "# of occupied seats: {}\n",
+            step.count(FerryLocation::TakenSeat)
+        );
     }
 
     Ok(())

src/map.rs

@@ -62,12 +62,16 @@ impl<X: Clone> Map<X> {
         let mut sy = (y as isize) + rise;
 
         loop {
-            if sx < 0 { return None; }
-            if sy < 0 { return None; }
+            if sx < 0 {
+                return None;
+            }
+            if sy < 0 {
+                return None;
+            }
 
             let entry = self.at_unwrapped(sx as usize, sy as usize)?;
             if f(&entry) {
-                return Some(entry)
+                return Some(entry);
             }
 
             sx += run;
@@ -76,7 +80,10 @@ impl<X: Clone> Map<X> {
     }
 
     pub fn set(&mut self, x: usize, y: usize, value: X) -> Result<(), MapOperationError> {
-        let row = self.data.get_mut(y).ok_or(MapOperationError::OutOfBounds(x, y))?;
+        let row = self
+            .data
+            .get_mut(y)
+            .ok_or(MapOperationError::OutOfBounds(x, y))?;
 
         if x >= self.width {
             return Err(MapOperationError::OutOfBounds(x, y));
@@ -91,8 +98,12 @@ impl<X: Clone> Map<X> {
         self.adjacents_until(x, y, |_| true)
     }
 
-    pub fn adjacents_until(&self, x: usize, y: usize, f: fn(&X) -> bool) -> Result<Vec<X>, MapOperationError>
-    {
+    pub fn adjacents_until(
+        &self,
+        x: usize,
+        y: usize,
+        f: fn(&X) -> bool,
+    ) -> Result<Vec<X>, MapOperationError> {
         if y >= self.height {
             return Err(MapOperationError::OutOfBounds(x, y));
         }
@@ -111,7 +122,6 @@ impl<X: Clone> Map<X> {
         push_some(&mut results, self.view(f, x, y, 1, 0));
         push_some(&mut results, self.view(f, x, y, 1, 1));
 
-
         Ok(results)
     }
 
@@ -130,13 +140,13 @@ impl<X: Clone + PartialEq> Map<X> {
     }
 }
 
-pub struct MapLocations<'a,X: Clone> {
+pub struct MapLocations<'a, X: Clone> {
     underlying: &'a Map<X>,
     x: usize,
     y: usize,
 }
 
-impl<'a, X: Clone> Iterator for MapLocations<'a,X> {
+impl<'a, X: Clone> Iterator for MapLocations<'a, X> {
     type Item = (usize, usize, X);
 
     fn next(&mut self) -> Option<Self::Item> {
@@ -173,13 +183,11 @@ impl<X: Clone + Into<char>> Map<X> {
 
 impl<X: Clone + PartialEq> PartialEq<Map<X>> for Map<X> {
     fn eq(&self, other: &Self) -> bool {
-        self.height == other.height &&
-          self.width == other.width &&
-          self.data == other.data
+        self.height == other.height && self.width == other.width && self.data == other.data
     }
 }
 
-impl<X: Clone + PartialEq + Eq> Eq for Map<X> { }
+impl<X: Clone + PartialEq + Eq> Eq for Map<X> {}
 
 fn push_some<X>(vector: &mut Vec<X>, value: Option<X>) {
     if let Some(val) = value {