Split singe file into set of src files

lib/src/dartsunfish.dart

@@ -0,0 +1,87 @@
+import 'dart:io';
+import 'dart:developer' as dv;
+import 'package:dartsunfish/index.dart';
+
+class GameBot {
+  GameBot();
+
+  void gameMain() {
+    var hist = <Position>[
+      Position(initial, 0, [true, true], [true, true], 0, 0),
+    ];
+    var searcher = Searcher();
+    while (true) {
+      UI.printBoard(hist.last);
+
+      if (hist.last.score <= -MATE_LOWER) {
+        print('You lost');
+        break;
+      }
+
+      // We query the user until she enters a (pseudo) legal move.
+      var move = <int>[];
+      final possibleMoves = hist.last.generateMoves().toList();
+      while (!possibleMoves.doContains(move)) {
+        var pattern = RegExp(
+          r'([a-h][1-8])' * 2,
+          caseSensitive: false,
+          multiLine: false,
+        );
+        print('Your move:');
+        var input = stdin.readLineSync();
+        var match = pattern.firstMatch(input.toString());
+        if (match != null) {
+          move = [UI.parse(match.group(1)), UI.parse(match.group(2))];
+          if (!possibleMoves.doContains(move)) {
+            print('Not valid move typed in. Try again');
+          }
+        } else {
+          // Inform the user when invalid input (e.g. "help") is entered
+          print('Please enter a move like g8f6');
+        }
+      }
+      try {
+        hist.add(hist.last.movePiece(move));
+      } catch (e) {
+        // print(e.toString());
+      }
+
+      // After our move we rotate the board and print it again.
+      // This allows us to see the effect of our move.
+      UI.printBoard(hist.last.rotate());
+      // print('${hist.last.score}');
+
+      if (hist.last.score <= -MATE_LOWER) {
+        print('You won');
+        break;
+      }
+      // Fire up the engine to look for a move.
+      var _depth = 0;
+      var score = 0;
+      var start = getSeconds();
+/*
+    */
+      for (var s in searcher.search(hist.last, hist.toSet())) {
+        _depth = s[0];
+        move = s[1];
+        score = s[2] ?? 0;
+        if (getSeconds() - start > 1) {
+          break;
+        }
+      }
+
+      if (score == MATE_UPPER) {
+        print('Checkmate!');
+      }
+      // The black player moves from a rotated position, so we have to
+      // 'back rotate' the move before printing it.
+      print('My move: ${UI.render(119 - move[0]) + UI.render(119 - move[1])}');
+      hist.add(hist.last.movePiece(move));
+    }
+  }
+
+  void playGame() {
+    setPst();
+    gameMain();
+  }
+}