nice

src/lib.rs

@@ -1,6 +1,8 @@
 mod board;
 mod game;
 
+use std::io::Write;
+
 use board::Player;
 
 pub use board::Board;
@@ -17,3 +19,32 @@ impl GamePlayer for GreedyPlayer {
         board.set(first_free, Some(this_player));
     }
 }
+
+pub struct HumanPlayer;
+
+impl GamePlayer for HumanPlayer {
+    fn next_move(&mut self, board: &mut Board, this_player: Player) {
+        loop {
+            print!("{board}where to put the next {this_player}? (0-8): ");
+
+            std::io::stdout().flush().unwrap();
+            let mut buf = String::new();
+            std::io::stdin().read_line(&mut buf).unwrap();
+
+            match buf.trim().parse() {
+                Ok(number) if number < 9 => match board.get(number) {
+                    None => {
+                        board.set(number, Some(this_player));
+                        return;
+                    }
+                    Some(_) => {
+                        println!("Field is occupied already.")
+                    }
+                },
+                Ok(_) | Err(_) => {
+                    println!("Invalid input.")
+                }
+            }
+        }
+    }
+}