impl Debug for Cells

mino/src/piece.rs

@@ -154,6 +154,27 @@ impl<'c> Cells<'c> {
     }
 }
 
+impl core::fmt::Debug for Cells<'_> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        let data = self.data();
+        let (xs, ys) = self.extents();
+        write!(f, "Cells{{x0={},y0={},data=[", xs.start, ys.start)?;
+        for (i, &row) in data.iter().enumerate() {
+            if i > 0 {
+                write!(f, ",")?;
+            }
+            write!(f, "\"")?;
+            for j in 0..xs.len() {
+                let occ = row & (1 << j) != 0;
+                write!(f, "{}", if occ { 'x' } else { '.' })?;
+            }
+            write!(f, "\"")?;
+        }
+        write!(f, "]}}")?;
+        Ok(())
+    }
+}
+
 /// Represents the current state of a piece.
 #[derive(Clone, Eq, PartialEq, Debug)]
 pub struct Piece<S> {