CPG/src/Chess/player.nim

import board as chess
import std/strformat
import std/strutils





when isMainModule:
    setControlCHook(proc () {.noconv.} = echo ""; quit(0))
    const fen = "rnbqkbnr/2p/8/8/8/8/P7/RNBQKBNR w KQkq - 0 1"
    var 
        board = newChessboardFromFEN(fen)
        canCastle: tuple[queen, king: bool]
        data: string
        move: Move

    echo "\x1Bc"
    while true:
        canCastle = board.canCastle()
        echo &"{board.pretty()}"
        echo &"Turn: {board.getSideToMove()}"
        echo &"Moves: {board.getMoveCount()} full, {board.getHalfMoveCount()} half"
        echo &"Can castle:\n  - King side: {(if canCastle.king: \"yes\" else: \"no\")}\n  - Queen side: {(if canCastle.queen: \"yes\" else: \"no\")}"
        stdout.write(&"En passant target: ")
        if board.getEnPassantTarget() != emptyLocation():
            echo board.getEnPassantTarget().locationToAlgebraic()
        else:
            echo "None"
        stdout.write(&"Check: ")
        if board.inCheck():
            echo &"Yes"
        else:
            echo "No"
        stdout.write("\nMove(s) -> ")
        try:
            data = readLine(stdin).strip(chars={'\0', ' '})
        except IOError:
            echo ""
            break
        if data == "undo":
            echo &"\x1BcUndo: {board.undoLastMove()}"
            continue
        if data == "reset":
            echo &"\x1BcBoard reset"
            board = newChessboardFromFEN(fen)
            continue
        for moveChars in data.split(" "):
            if len(moveChars) != 4:
                echo "\x1BcError: invalid move"
                break
            try:
                move = board.makeMove(moveChars[0..1], moveChars[2..3])
            except ValueError:
                echo &"\x1BcError: {getCurrentExceptionMsg()}"
            if move == emptyMove():
                echo &"\x1BcError: move '{moveChars}' is illegal"
                break
            else:
                echo "\x1Bc"