1 files changed, 25 insertions, 0 deletions

diff --git a/rust/minesweeper/src/lib.rs b/rust/minesweeper/src/lib.rs
new file mode 100644
index 0000000..febfdb3
--- /dev/null
+++ b/rust/minesweeper/src/lib.rs
@@ -0,0 +1,25 @@
+static OFFSETS: &'static[(i32,i32)] = &[
+    (-1,-1), (-1, 0), (-1, 1),
+    ( 0,-1),          ( 0, 1),
+    ( 1,-1), ( 1, 0), ( 1, 1)
+];
+
+pub fn annotate(minefield: &[&str]) -> Vec<String> {
+    let height = minefield.len() as i32;
+    (0..height).map(|i| {
+        let width = minefield[i as usize].len() as i32;
+        (0..width).map(|j| {
+            if minefield[i as usize].as_bytes()[j as usize] == b' ' {
+                let count = OFFSETS
+                    .iter()
+                    .map(|(oi,oj)| (i+oi,j+oj))
+                    .filter(|&(i,j)| i >= 0 && i < height && j >= 0 && j < width)
+                    .filter(|&(i,j)| minefield[i as usize].as_bytes()[j as usize] == b'*')
+                    .count();
+                if count > 0 { char::from_digit(count as u32,10).unwrap() } else { ' ' }
+            } else {
+                '*'
+            }
+        }).collect()
+    }).collect()
+}