feat: add Arasan engine

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "Sources/ChessKitEngineCore/Engines/lc0"]
 	path = Sources/ChessKitEngineCore/Engines/lc0
 	url = https://github.com/chesskit-app/lc0.git
+[submodule "Sources/ChessKitEngineCore/Engines/arasan-chess"]
+	path = Sources/ChessKitEngineCore/Engines/arasan-chess
+	url = git@github.com:ameter/arasan-chess.git

Package.swift

@@ -21,7 +21,8 @@ let package = Package(
             dependencies: ["ChessKitEngineCore"],
             resources: [
                 .copy("Resources/192x15_network"),
-                .copy("Resources/nn-1337b1adec5b.nnue")
+                .copy("Resources/nn-1337b1adec5b.nnue"),
+                .copy("Resources/book.bin")
             ]
         ),
         .target(
@@ -31,7 +32,17 @@ let package = Package(
                 .headerSearchPath("Engines/lc0/src"),
                 .headerSearchPath("Engines/lc0/subprojects/eigen-3.4.0"),
                 .define("NNUE_EMBEDDING_OFF"),
-                .define("NO_PEXT")
+                .define("NO_PEXT"),
+                // Arasan
+                .headerSearchPath("Engines/arasan-chess/src"),
+                .headerSearchPath("Engines/arasan-chess/src/nnue"),
+                .define("ARASAN_VERSION=v24.0.0"),
+                .define("_64BIT"),
+                .define("USE_INTRINSICS"),
+                .define("USE_ASM"),
+                .define("SYZYGY_TBS"),
+                .define("SMP"),
+                .define("SMP_STATS"),
             ],
             linkerSettings: [
                 .linkedLibrary("z")
@@ -48,6 +59,18 @@ let package = Package(
 // MARK: - ChessKitEngineCore excludes
 
 package.targets.first { $0.name == "ChessKitEngineCore" }?.exclude = [
+    // Arasan
+    "Engines/arasan-chess/src/arasanx.cpp",
+    "Engines/arasan-chess/src/unit.cpp",
+    "Engines/arasan-chess/src/tuner.cpp",
+    "Engines/arasan-chess/src/tune.cpp",
+    "Engines/arasan-chess/src/topo.cpp",
+    "Engines/arasan-chess/src/bitbase.cpp",
+    "Engines/arasan-chess/src/util",
+    "Engines/arasan-chess/src/nnue/test",
+    "Engines/arasan-chess/src/syzygy/src/apps",
+    "Engines/arasan-chess/src/syzygy/src/tbchess.c",
+    "Engines/arasan-chess/src/nnueintf.cpp",
     // lc0
     "Engines/lc0/build",
     "Engines/lc0/cross-files",

README.md

@@ -102,6 +102,7 @@ The following engines are currently supported:
 | :---: | --- | :---: | :---: | :---: |
 | <img src="https://stockfishchess.org/images/logo/icon_512x512.png" width="25" /> | [Stockfish](https://stockfishchess.org) | [15.1](https://github.com/official-stockfish/Stockfish/tree/sf_15.1) | [GPL v3](https://github.com/official-stockfish/Stockfish/blob/sf_15.1/Copying.txt) | [🔗](https://github.com/official-stockfish/Stockfish/tree/sf_15.1#the-uci-protocol-and-available-options)
 | <img src="https://lczero.org/images/logo.svg" width="25" /> | [lc0](https://lczero.org) | [0.29](https://github.com/LeelaChessZero/lc0/tree/v0.29.0) | [GPL v3](https://github.com/LeelaChessZero/lc0/blob/v0.29.0/COPYING) | [🔗](https://github.com/LeelaChessZero/lc0/wiki/Lc0-options)
+| <img src="https://www.arasanchess.org/arasan2.gif" width="25" /> | [Arasan](https://www.arasanchess.org) | [24.0.0](https://github.com/jdart1/arasan-chess/tree/v24.0.0) | [MIT License](https://github.com/jdart1/arasan-chess/blob/v24.0.0/LICENSE) | [🔗](https://github.com/jdart1/arasan-chess/tree/v24.0.0#uci-options)
 
 ## Author
 

Sources/ChessKitEngine/EngineType.swift

@@ -10,12 +10,14 @@ public enum EngineType: Int {
 
     case stockfish
     case lc0
+    case arasan
 
     /// Internal mapping from Swift to Obj-C type.
     var objc: EngineType_objc {
         switch self {
         case .stockfish:    return .stockfish
         case .lc0:          return .lc0
+        case .arasan:       return .arasan
         }
     }
 
@@ -24,6 +26,7 @@ public enum EngineType: Int {
         switch self {
         case .stockfish:    return "Stockfish"
         case .lc0:          return "LeelaChessZero (Lc0)"
+        case .arasan:        return "Arasan"
         }
     }
 
@@ -32,6 +35,7 @@ public enum EngineType: Int {
         switch self {
         case .stockfish:    return "15.1"
         case .lc0:          return "0.29"
+        case .arasan:       return "24.0.0"
         }
     }
 
@@ -59,6 +63,15 @@ public enum EngineType: Int {
                 weights != nil ?
                     .setoption(id: "WeightsFile", value: weights!) : nil
             ].compactMap { $0 }
+        case .arasan:
+            let openingBook = Bundle.module.url(forResource: "book", withExtension: "bin")?
+                .absoluteString
+                .replacingOccurrences(of: "file://", with: "")
+
+            return [
+                openingBook != nil ?
+                    .setoption(id: "BookPath", value: openingBook!) : nil
+            ].compactMap { $0 }
         }
     }
 

Sources/ChessKitEngineCore/EngineMessenger/EngineMessenger.mm

@@ -28,6 +28,9 @@ - (id)initWithEngineType: (EngineType_objc) type {
             case EngineTypeLc0:
                 _engine = new Lc0Engine();
                 break;
+            case EngineTypeArasan:
+                _engine = new ArasanEngine();
+                break;
         }
 
         _engine->initialize();

Sources/ChessKitEngineCore/Engines/AvailableEngines.h

@@ -8,5 +8,6 @@
 
 #import "../Engines/Extensions/stockfish+engine.h"
 #import "../Engines/Extensions/lc0+engine.h"
+#import "../Engines/Extensions/arasan+engine.h"
 
 #endif /* AvailableEngines_h */

Sources/ChessKitEngineCore/Engines/EngineType_objc.h

@@ -8,7 +8,8 @@
 
 typedef NS_ENUM(NSInteger, EngineType_objc) {
     EngineTypeStockfish,
-    EngineTypeLc0
+    EngineTypeLc0,
+    EngineTypeArasan
 };
 
 #endif /* EngineType_objc_h */

Sources/ChessKitEngineCore/Engines/Extensions/arasan+engine.cpp

@@ -0,0 +1,73 @@
+//
+//  arasan+engine.cpp
+//
+//  Created by Chris Ameter on 10/10/23.
+//
+
+#import "arasan+engine.h"
+
+#include "../arasan-chess/src/types.h"
+#include "../arasan-chess/src/globals.h"
+#include "../arasan-chess/src/options.h"
+#include "../arasan-chess/src/protocol.h"
+
+#include <iostream>
+#include <fstream>
+
+Protocol *protocol;
+Board board;
+
+void ArasanEngine::initialize() {
+    signal(SIGINT,SIG_IGN);
+
+    // Show a message on the console
+    std::cout << "Arasan " Arasan_Version << ' ' << Arasan_Copyright << std::endl;
+    // Must use unbuffered console
+    setbuf(stdin,NULL);
+    setbuf(stdout, NULL);
+    std::cout.rdbuf()->pubsetbuf(NULL, 0);
+    std::cin.rdbuf()->pubsetbuf(NULL, 0);
+
+    Bitboard::init();
+    Board::init();
+    globals::initOptions();
+    Attacks::init();
+    Scoring::init();
+    Search::init();
+    if (!globals::initGlobals(true)) {
+        globals::cleanupGlobals();
+        exit(-1);
+    }
+
+    struct rlimit rl;
+    const rlim_t STACK_MAX = static_cast<rlim_t>(globals::LINUX_STACK_SIZE);
+    auto result = getrlimit(RLIMIT_STACK, &rl);
+    if (result == 0)
+    {
+        if (rl.rlim_cur < STACK_MAX)
+        {
+            rl.rlim_cur = STACK_MAX;
+            result = setrlimit(RLIMIT_STACK, &rl);
+            if (result)
+            {
+                std::cerr << "failed to increase stack size" << std::endl;
+                exit(-1);
+            }
+        }
+    }
+
+    bool ics = true, trace = false, cpusSet = false, memorySet = false;
+
+    protocol = new Protocol(board, trace, ics, cpusSet, memorySet);
+    // Begins protocol (UCI) run loop, listening on standard input
+    // protocol->poll(globals::polling_terminated);
+}
+
+void ArasanEngine::deinitialize() {
+    globals::cleanupGlobals();
+    delete protocol;
+}
+
+void ArasanEngine::send_command(const std::string &cmd) {
+    protocol->do_command(cmd, board);
+}

Sources/ChessKitEngineCore/Engines/Extensions/arasan+engine.h

@@ -0,0 +1,21 @@
+//
+//  arasan+engine.h
+//
+//  Created by Chris Ameter on 10/10/23.
+//
+
+#ifndef arasan_engine_h
+#define arasan_engine_h
+
+#import "engine.h"
+#import <string>
+
+/// Arasan implementation of `Engine`.
+class ArasanEngine: public Engine {
+public:
+    void initialize();
+    void deinitialize();
+    void send_command(const std::string &cmd);
+};
+
+#endif /* arasan_engine_h */

Tests/ChessKitEngineTests/EngineTests/ArasanTests.swift

@@ -0,0 +1,17 @@
+//
+//  ArasanTests.swift
+//
+//  Created by Chris Ameter on 10/20/23.
+//
+
+import XCTest
+@testable import ChessKitEngine
+
+final class ArasanTests: BaseEngineTests {
+
+    override func setUp() {
+        engineType = .arasan
+        super.setUp()
+    }
+
+}