gifresizer

#!/usr/bin/env bash
# Dependencies: gifsicle, xrandr

usage() {
	echo "Usage: gifresizer -i <inputfile> -o <outputfile> [-d <geometry>]
  
  geometry format: widthxheight+x+y

  Options:
  -h    Show this help
  -d    Set geometry (defaults to screen resolution)
"
}

geometry=""
while getopts "hi:g:o:" flag; do
  case "${flag}" in
    h) usage
      exit 0
      ;;
    i)
      inputfile="${OPTARG}"
      ;;
    d)
      geometry="${OPTARG}"
      ;;
    o)
      outputfile="${OPTARG}"
      ;;
    *) usage
      exit 1
      ;;
  esac
done

if [ -z "${inputfile}" ] || [ -z "${outputfile}" ]; then
  echo "Missing input/output file. Exiting..."
  exit 1
fi

if [ -z "${geometry}" ]; then
  geometry=$(xrandr --nograb --current | awk '/\*/ {printf $1; exit}')
fi

gifsicle "${inputfile}" --resize "${geometry}" > "${outputfile}"