fasmg: add updateScript

{ lib, stdenv

, fetchzip

# update script

, writeScript

, coreutils

, curl

, gnugrep

, htmlq

, nix-update

}:

stdenv.mkDerivation rec {

    cp docs/*.txt $doc/share/doc/fasmg

  '';

  passthru.updateScript = writeScript "update-fasmg.sh" ''

    export PATH="${lib.makeBinPath [ coreutils curl gnugrep htmlq nix-update ]}:$PATH"

    version=$(

      curl 'https://flatassembler.net/download.php' \

        | htmlq .links a.boldlink  -a href \

        | grep -E '^fasmg\..*\.zip$' \

        | head -n1 \

        | cut -d. -f2

    )

    nix-update fasmg --version "$version"

  '';

  meta = with lib; {

    description = "x86(-64) macro assembler to binary, MZ, PE, COFF, and ELF";

    mainProgram = "fasmg";