Reinitialize repository and add working move generation for all pieces

helper_scripts/generate_pawn_attacks.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+
+def generate_pawn_attacks():
+    """
+    Generates a list of 64 u64 bitboards for each color (White, Black),
+    where each bitboard represents the squares a pawn can attack from
+    a given source square.
+    Uses Little-Endian File-Rank (LEFR) mapping: A1=0, H1=7, A2=8, ..., H8=63.
+
+    Returns:
+        [[u64; 64]; 2]  (represented as a list of two lists)
+        Index 0: White attacks
+        Index 1: Black attacks
+    """
+
+    # all_attacks[0] = White, all_attacks[1] = Black
+    all_attacks = [[], []]
+
+    for sq in range(64):
+        rank = sq // 8
+        file = sq % 8
+
+        white_attacks_bb = 0
+        black_attacks_bb = 0
+
+        # --- White Attacks (Index 0) ---
+        # Pawns attack "up" the board (increasing square index)
+        # We only generate attacks if the pawn is not on the 8th rank
+        if rank < 7:
+            # Attack Up-Left (e.g., B2 -> A3)
+            # Not possible if pawn is on the A-file
+            if file > 0:
+                white_attacks_bb |= (1 << (sq + 7))
+
+            # Attack Up-Right (e.g., B2 -> C3)
+            # Not possible if pawn is on the H-file
+            if file < 7:
+                white_attacks_bb |= (1 << (sq + 9))
+
+        # --- Black Attacks (Index 1) ---
+        # Pawns attack "down" the board (decreasing square index)
+        # We only generate attacks if the pawn is not on the 1st rank
+        if rank > 0:
+            # Attack Down-Left (e.g., G7 -> F6)
+            # Not possible if pawn is on the A-file
+            if file > 0:
+                black_attacks_bb |= (1 << (sq - 9))
+
+            # Attack Down-Right (e.g., G7 -> H6)
+            # Not possible if pawn is on the H-file
+            if file < 7:
+                black_attacks_bb |= (1 << (sq - 7))
+
+        all_attacks[0].append(white_attacks_bb)
+        all_attacks[1].append(black_attacks_bb)
+
+    return all_attacks
+
+def print_rust_array(attacks_by_color, const_name):
+    """
+    Prints the list of attack bitboards as a nested Rust array.
+    """
+    print(f"pub const {const_name}: [[u64; 64]; 2] = [")
+
+    # --- Print White Attacks ---
+    print("    [ // Color 0: White")
+    for i, attacks_bb in enumerate(attacks_by_color[0]):
+        raw_binary_string = f"{attacks_bb:064b}"
+        chunks = [raw_binary_string[i:i+8] for i in range(0, 64, 8)]
+        binary_string = f"0b{'_'.join(chunks)}"
+        print(f"        {binary_string}, // Square {i} ({'ABCDEFGH'[i%8]}{i//8 + 1})")
+    print("    ],")
+
+    # --- Print Black Attacks ---
+    print("    [ // Color 1: Black")
+    for i, attacks_bb in enumerate(attacks_by_color[1]):
+        raw_binary_string = f"{attacks_bb:064b}"
+        chunks = [raw_binary_string[i:i+8] for i in range(0, 64, 8)]
+        binary_string = f"0b{'_'.join(chunks)}"
+        print(f"        {binary_string}, // Square {i} ({'ABCDEFGH'[i%8]}{i//8 + 1})")
+    print("    ]")
+
+    print("];")
+
+if __name__ == "__main__":
+    attacks = generate_pawn_attacks()
+    print_rust_array(attacks, "PAWN_ATTACKS")