Add UCI communication example

src/interface/uci.rs

@@ -1,5 +1,5 @@
 use std::{
-    io::{self, BufRead, Write},
+    io::{BufRead, Write},
     str::SplitWhitespace,
 };
 
@@ -133,38 +133,34 @@ pub fn uci_go(go: &mut SplitWhitespace, game: &mut Game) -> Result<Move, String>
     Ok(Move::new(Square::B8, Square::C6))
 }
 
-pub fn uci_loop() -> Result<(), String> {
+pub fn uci_loop<R: BufRead, W: Write>(input: R, mut output: W) -> Result<(), String> {
-    let stdin = io::stdin();
-    let stdout = io::stdout();
-    let handle_in = stdin.lock();
-    let mut handle_out = stdout.lock();
     let mut params = UciParameters::new();
 
-    for line in handle_in.lines() {
+    for line in input.lines() {
         let line_str = line.unwrap_or_else(|_| "quit".to_string());
         let mut parts = line_str.split_whitespace();
         let command = parse_command(&mut parts)?;
         let response = match command {
             Command::Uci => Response::UciOk,
             Command::IsReady => Response::ReadyOk,
-            Command::UciNewGame => Response::Info("Clear cached game.".to_string()),
+            Command::UciNewGame => Response::Info("Clear cache".to_string()),
             Command::Position => {
                 params.add_game(uci_position(&mut parts)?);
-                Response::Info("Initialized position.".to_string())
+                Response::Info("Initialized position".to_string())
             }
             Command::Go => {
                 if let Some(ref mut game) = params.game {
                     let best_move = uci_go(&mut parts, game)?;
                     Response::BestMove(best_move.parse_into_str())
                 } else {
-                    Response::Info("Going!".to_string())
+                    Response::Info("Going?".to_string())
                 }
             }
             Command::Quit => break,
         };
 
-        write_response(&mut handle_out, response)?;
+        write_response(&mut output, response)?;
-        handle_out.flush().map_err(|e| e.to_string())?;
+        output.flush().map_err(|e| e.to_string())?;
     }
 
     Ok(())
@@ -172,11 +168,16 @@ pub fn uci_loop() -> Result<(), String> {
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use crate::{
-        board::fen::from_fen,
+        board::{fen::from_fen, game::Game, square::Square},
         interface::uci::{parse_command, Command},
+        movegen::r#move::Move,
     };
 
+    use super::uci_go;
+    use super::uci_loop;
     use super::uci_position;
 
     const FEN: [&str; 2] = [
@@ -205,32 +206,37 @@ mod tests {
 
     #[test]
     fn test_uci_go() -> Result<(), String> {
-        let mut _game = from_fen(FEN[0])?;
+        let mut game = Game::new();
+        let command_go = "go depth 4";
+        let mut parts = command_go.split_whitespace();
+        let response = uci_go(&mut parts, &mut game)?;
 
+        assert_eq!(Move::new(Square::B8, Square::C6), response);
         Ok(())
     }
 
     #[test]
     fn test_uci_loop() -> Result<(), String> {
-        let mut _game = from_fen(FEN[0])?;
+        let commands = b"uci\n\
+            ucinewgame\n\
+            position startpos moves e2e4 e7e5\n\
+            go\n\
+            quit";
+        let input = Cursor::new(commands);
+        let mut output: Vec<_> = vec![];
+
+        uci_loop(input, &mut output)?;
+
+        let expected_response = "id name ippos\n\
+            id author stefiosif\n\
+            uciok\n\
+            Clear cache\n\
+            Initialized position\n\
+            bestmove b8c6\n";
+        let actual_response = String::from_utf8(output).expect("Invalid UTF-8 in output");
+
+        assert_eq!(expected_response, actual_response);
 
         Ok(())
     }
 }
-
-/*
-```
-- CuteChess: `uci`
-- Engine: `id name MyChessEngine`
-- Engine: `id author John Doe`
-- Engine: `option name Hash type spin default 32 min 1 max 512`
-- Engine: `uciok`
-- CuteChess: `setoption name Hash value 128`
-- CuteChess: `ucinewgame`
-- CuteChess: `position startpos moves e2e4 e7e5`
-- CuteChess: `go wtime 600000 btime 600000 winc 0 binc 0`
-- Engine: `info depth 1 score cp 20 nodes 15 nps 1500 time 10 pv e2e4`
-- Engine: `bestmove e2e4`
-- CuteChess: `quit`
-```
-*/

src/main.rs

@@ -1,16 +1,24 @@
+use std::io;
+
 mod board;
 mod evaluation;
 mod interface;
 mod movegen;
 mod search;
 
+use interface::uci;
+
 fn main() {
     movegen::attack::init_attacks();
 
     let command = std::env::args().nth(1).unwrap_or(String::from("quit"));
     match command.as_str() {
         "perft" => search::perft::perftree_script(),
-        "uci" => interface::uci::uci_loop().unwrap_or_else(|e| println!("{}", e)),
+        "uci" => {
+            let input = io::stdin().lock();
+            let output = io::stdout().lock();
+            uci::uci_loop(input, output).unwrap_or_else(|e| println!("{}", e));
+        }
         "quit" => println!("Exiting.."),
         _ => println!("Wrong command. Exiting.."),
     };