Add depth based logging

src/search/iterative_deepening.rs

@@ -1,6 +1,9 @@
+use std::io;
+
 use crate::{
     board::game::Game,
     evaluation::{MAX_SCORE, MIN_SCORE},
+    interface::uci::{write_response, Response},
     movegen::r#move::Move,
 };
 
@@ -22,6 +25,8 @@ pub fn iterative_deepening(
             return Ok(best_move);
         }
 
+        let mut total_nodes_searched = 0;
+
         let score = negamax::negamax(
             game,
             MIN_SCORE,
@@ -29,6 +34,7 @@ pub fn iterative_deepening(
             depth,
             0,
             &TimeInfo::new(time, remaining_time),
+            &mut total_nodes_searched,
         );
 
         if score.is_err() {
@@ -37,10 +43,44 @@ pub fn iterative_deepening(
 
         best_score = score?;
         best_move = game.tt.lookup(game.hash).and_then(|entry| entry.mv);
+
+        let nps = ((total_nodes_searched * 1_000_000) as u128).div_ceil(time.elapsed().as_micros())
+            as u64;
+
+        write_response(
+            &mut io::stdout(),
+            &search_info(
+                depth,
+                time.elapsed().as_millis() as u64,
+                total_nodes_searched,
+                nps,
+                best_score,
+                best_move,
+            ),
+        )?;
     }
     Ok(best_move)
 }
 
+fn search_info(
+    depth: u8,
+    time: u64,
+    total_nodes_searched: u64,
+    nps: u64,
+    best_score: i32,
+    best_move: Option<Move>,
+) -> Response {
+    Response::Info(format!(
+        "info depth {} time {} nodes {} nps {} eval {} pv {}",
+        depth,
+        time,
+        total_nodes_searched,
+        nps,
+        best_score,
+        best_move.expect("msg: No best move found")
+    ))
+}
+
 #[cfg(test)]
 mod tests {
     use crate::{