Turns out I was doing the starting position really wrong. In an upcoming commit,
I will implement FEN output for Positions. While doing that work, I found several
issues that were causing the output of the FEN formatter to return garbage.
Implement a handful of unit tests to track down the errors.
Rename Shape::_ascii_representation() → Shape::to_ascii.
Implement to_ascii() on Piece.
This makes Position immutable, even if declared mut. I think this will also make
it easier to build positions going forward.
Moving to a PieceBitBoards struct also required a lot of places that return owned
BitBoards to return refs. This is basically fine except for adding a few more &
here and there.
This was a huge refactoring project. All the move generators and a bunch of
BitBoard stuff needed to be updated.
Add a new Sight trait, implemented by PlacedPiece. The implementation of this
trait produces a BitBoard representing the squares visible to the placed piece.
- ASCIIDisplay → format a type using ASCII only characters
- UnicodeDisplay → format a type using any Unicode characters
- FENDisplay → format a type for inclusion in a FEN string
This macro implements a tiny DSL for creating Pieces and PlacedPieces.
"White King" → Piece::new(Color::White, Shape::King)
"White King on E4" → PlacedPiece::new(Piece::new(Color::White, Shape::King), Square::E4)
Move position.rs to the position module and create a mod.rs.
Do the same for bitboard.rs in the bitboard modules.
Export Color, Piece, Position, and Square and use crate::Thing directly instead of referring to the symbol in the nested modules.
