update chess openings db (#2404)

* update chess openings db

* bump chess openings db version

lib/src/db/openings_database.dart

@@ -8,7 +8,7 @@ import 'package:sqflite/sqflite.dart';
 // The dataset is from https://github.com/lichess-org/chess-openings
 // It can be updated by running the script at scripts/update_openings_db.py
 
-const _kDatabaseVersion = 3;
+const _kDatabaseVersion = 4;
 const _kDatabaseName = 'chess_openings$_kDatabaseVersion.db';
 
 /// A provider for the openings database.

scripts/update_openings_db.py

@@ -21,15 +21,28 @@ subprocess.run(["make", "all"], cwd=path_to_chess_openings, check=True)
 db_path = os.path.join(os.path.dirname(__file__), '../assets/chess_openings.db')
 conn = sqlite3.connect(db_path)
 
+old_openings = set()
+new_openings = set()
+
+openings_sql = 'SELECT eco || " " || name || " " || pgn FROM openings ORDER BY eco, name, pgn;'
+
 with open(os.path.join(path_to_chess_openings, 'dist/all.tsv'), 'r') as f:
     dr = csv.DictReader(f, delimiter='\t')
     to_db = [(i['eco'], i['name'], i['pgn'], i['uci'], i['epd']) for i in dr]
 
     cur = conn.cursor()
+
+    old_openings = set(row[0] for row in cur.execute(openings_sql))
     cur.execute('DELETE FROM openings;')
     conn.commit()
 
     cur.executemany('INSERT INTO openings (eco, name, pgn, uci, epd) VALUES (?, ?, ?, ?, ?);', to_db)
     conn.commit()
-
+    new_openings = set(row[0] for row in cur.execute(openings_sql))
 conn.close()
+
+print(f"Opening changes:")
+print("```diff")
+[print(f"-  {o}") for o in sorted(old_openings - new_openings)]
+[print(f"+  {o}") for o in sorted(new_openings - old_openings)]
+print("```")