Shell functions for scanning/repairing MAME ROMs for OpenEmu on a Mac. Copy into your .zshrc file. Not tested on bash.

oemame.sh

# advscan MAME roms/disks/samples scans and repairs.
function oemame.scan {
  local command=${@:-scan}
  local base_dir=$HOME/Library/Application\ Support/OpenEmu
  local version=${${${:-`defaults read \
    $base_dir/Cores/MAME.oecoreplugin/Contents/Info.plist CFBundleVersion`
  }/./}%%.*}

  # Go back to current directory when done.
  # advscan can't resolve paths when run outside advscan.rc.
  trap "cd `pwd`" INT TERM EXIT

  if [[ ! -e $base_dir/AdvanceScan ]]; then
    echo Setting up AdvanceScan...
    mkdir -p $base_dir/AdvanceScan && cd "$_" && open .
    mkdir -p _import _unknown/roms _unknown/disks _unknown/samples ../MAME/samples
    ln -s ../Game\ Library/roms/Arcade roms && ln -s ../MAME/samples samples

cat <<-EOF > advscan.rc
		rom_import _import
		rom_new roms
		rom roms
		disk roms
		sample samples
		rom_unknown _unknown/roms
		disk_unknown _unknown/disks
		sample_unknown _unknown/samples
EOF

  else
    cd $base_dir/AdvanceScan
  fi

  if [[ ! -f mame${version}.xml ]]; then
    if [[ ! -f $TMPDIR/mame${version}lx.zip ]]; then
      curl -Lo $TMPDIR/mame${version}lx.zip \
        https://github.com/mamedev/mame/releases/download/mame${version}/mame${version}lx.zip
    fi
    unzip $TMPDIR/mame${version}lx.zip -d ./
  fi

  # @todo
  # AdvanceScan will not read chd files within its own directory.
  # Add each sub-directory to the .rc file so it can see them.
  # - read advscan.rc
  # - get rom directory
  # - look for subdirectories with rom directory
  # - check for a corresponding zip file
  # - add all to the 'disk' entry within advscan.rc

  if [[ $command == scan ]]; then
    echo Scanning...
    # Ignore errors about missing samples and clean excessive output.
    # There's a bug where it lists a missing rom as good.
    advscan -rkspP < mame${version}.xml 2> >(grep -v sampleof >&2) |
      grep -vE "(^game_(rom|disk|sample)_miss|.*\s{6}0\s.*)"

  elif [[ $command == repair ]]; then
    echo Repairing...
    advscan -rksbdutgP < mame${version}.xml 2> >(grep -v sampleof >&2)

  elif [[ $command == repair-preview ]]; then
    echo "Repairing (preview)..."
    advscan -rksbdugtnP < mame${version}.xml 2> >(grep -v sampleof >&2)

  else
    echo Invalid command.

  fi
}
function oemame.repair {
  oemame.scan repair
}
function oemame.repair-preview {
  oemame.scan repair-preview
}

More info...