Retire move.cpp

Move its functions where they belong.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/search.cpp

@@ -161,13 +161,19 @@ namespace {
   // operator<<() that will use it to properly format castling moves.
   enum set960 {};
 
-  std::ostream& operator<< (std::ostream& os, const set960& m) {
+  std::ostream& operator<< (std::ostream& os, const set960& f) {
 
-    os.iword(0) = int(m);
+    os.iword(0) = int(f);
     return os;
   }
 
 
+  // Overload operator << for moves to make it easier to print moves in
+  // coordinate notation compatible with UCI protocol.
+
+  std::ostream& operator<<(std::ostream& os, Move m);
+
+
   /// Adjustments
 
   // Step 6. Razoring
@@ -2711,4 +2717,35 @@ split_point_start: // At split points actual search starts from here
               }
   }
 
+  // Overload operator << to make it easier to print moves in coordinate notation
+  // (g1f3, a7a8q, etc.). The only special case is castling moves, where we
+  // print in the e1g1 notation in normal chess mode, and in e1h1 notation in
+  // Chess960 mode.
+
+  std::ostream& operator<<(std::ostream& os, Move m) {
+
+    Square from = move_from(m);
+    Square to = move_to(m);
+    bool chess960 = (os.iword(0) != 0); // See set960()
+
+    if (m == MOVE_NONE)
+        return os << "(none)";
+
+    if (m == MOVE_NULL)
+        return os << "0000";
+
+    if (move_is_short_castle(m) && !chess960)
+        return os << (from == SQ_E1 ? "e1g1" : "e8g8");
+
+    if (move_is_long_castle(m) && !chess960)
+        return os << (from == SQ_E1 ? "e1c1" : "e8c8");
+
+    os << square_to_string(from) << square_to_string(to);
+
+    if (move_is_promotion(m))
+        os << char(tolower(piece_type_to_char(move_promotion_piece(m))));
+
+    return os;
+  }
+
 } // namespace