giflooop - creates a forward-reverse loop of any animated gif

gifloop.sh

################################################################################
# creates a fwd-reverse loop of any gif
################################################################################
function gifloop {
  local -r original="${1:-UNSET}";
  local -r original_254="/tmp/${original/.gif/_254.gif}";
  local -r loop_unopt="/tmp/${original/.gif/_loop_unopt.gif}";
  local -r output="${original/.gif/_loop.gif}";

  if [[ "${orignal}" == "UNSET" ]]; then
    echo "Please pass in a gif filename.";
    exit 1;
  fi;

  "$(command -v gifsicle)" --colors=255 "${original}" -o "${original_254}";
  "$(command -v gifsicle)" --unoptimize "${original_254}" "${original_254}" "#-1-0" -o "${loop_unopt}";
  "$(command -v gifsicle)" --unoptimize "${loop_unopt}" "${loop_unopt}" "#-1-0" -O3 --lossy -o "${output}";
}