//! # eschac - a library for computing chess moves
//!
//! eschac implements fast legal move generation and a copy-make interface that enforces at compile
//! time that no illegal move is played, with no runtime checks and no potential panics.
//!
//! ## Overview
//!
//! In eschac, a chess position is represented with the [`Position`](position::Position) type.
//! [`Position::new`](position::Position::new) returns the starting position of a chess game, and
//! arbitrary positions can be built using the [`Setup`](setup::Setup) type. This type must be
//! validated and converted to [`Position`](position::Position) with
//! [`Setup::into_position`](setup::Setup::into_position). Legal moves are generated using the
//! [`Position::legal_moves`](position::Position::legal_moves) method or obtained from chess
//! notation like [`UciMove`](uci::UciMove) or [`San`](san::San). Moves are represented with the
//! [`Move<'l>`](moves::Move) type, which holds a reference to the origin position to ensure that
//! the move is not played on another one. Finally, moves are played with
//! [`Move::make`](moves::Move::make) which returns a new [`Position`](position::Position), and on
//! it goes.
//!
//! ## Example
//!
//! ```
//! # (|| -> Result<(), Box<dyn std::error::Error>> {
//!
//! use eschac::prelude::*;
//!
//! // read a position from a text record
//! let setup = Setup::from_text_record("7k/4P1rp/5Q2/5p2/1Pp1bP2/8/r4K1P/6R1 w - -")?;
//! let position = setup.into_position()?;
//!
//! // read a move in algebraic notation
//! let san = "Ke1".parse::<San>()?;
//! let m = san.to_move(&position)?;
//!
//! // play the move (note the absence of error handling)
//! let position = m.make();
//!
//! // generate all the legal moves on the new position
//! let moves = position.legal_moves();
//! for m in moves {
//!     // print the UCI notation of each move
//!     println!("{}", m.to_uci());
//! }
//! # Ok(()) });
//! ```
//!
//! ## Comparison with [shakmaty](https://crates.io/crates/shakmaty)
//!
//! shakmaty is another Rust library for chess processing. It is written by Niklas Fiekas, whose
//! work greatly inspired the development of eschac. For most purposes, shakmaty is probably a
//! better option, as eschac comes short of its miriad of features.
//!
//! Both libraries have the same core features:
//! - vocabulary to describe the chessboard (squares, pieces, etc.)
//! - parsing and editing positions
//! - parsing standard move notations
//! - fast legal move generation and play
//!
//! **eschac** distinguishes itself with:
//! - a focus on performance
//! - a more compact board representation
//! - its use of the borrow checker to guarantee only legal moves are played
//!
//! **shakmaty** will be more suitable for a lot of applications, with:
//! - vocabulary to describe and work with games, not just positions
//! - insufficient material detection
//! - PGN parsing
//! - Zobrist hashing
//! - Syzygy endgame tablebases
//! - chess960 and other variants
//! - etc.

#![no_std]

extern crate alloc;

pub(crate) mod array_vec;
pub(crate) mod lookup;
pub(crate) mod magics;

pub mod bitboard;
pub mod board;
pub mod moves;
pub mod position;
pub mod san;
pub mod setup;
pub mod uci;

/// The eschac prelude.
pub mod prelude {
    pub use crate::{
        bitboard::Bitboard, board::*, position::Position, san::San, setup::Setup, uci::UciMove,
    };
}
