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#lang br/quicklang
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(define (read-syntax path port)
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(define moveset-strs (string-split (port->string port)))
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(define moveset-datums
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(for*/list ([msstr (in-list moveset-strs)])
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`(moveset ,@(regexp-match* #rx"." msstr))))
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(strip-bindings
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#`(module day01-mod "day02.rkt"
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#,@moveset-datums)))
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(module+ reader (provide read-syntax))
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(define-macro moveset #'list)
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(provide moveset)
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(define-macro (mb . MOVESETS)
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#'(#%module-begin
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(void (solve (list . MOVESETS)))))
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(provide (rename-out [mb #%module-begin]))
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(define (do-moveset button moveset)
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(for/fold ([button button])
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([move (in-list moveset)])
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(vector-ref
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(case move
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[("U") '#(1 2 3 1 2 3 4 5 6)]
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[("L") '#(1 1 2 4 4 5 7 7 8)]
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[("R") '#(2 3 3 5 6 6 8 9 9)]
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[("D") '#(4 5 6 7 8 9 7 8 9)])
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(sub1 button))))
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(define starting-button 5)
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(define (solve mss)
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(for/fold ([button starting-button])
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([ms (in-list mss)])
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(define result (do-moveset button ms))
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(display (string-upcase (number->string result 16)))
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result))
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