.bin/imgcrush

   1 #!/bin/bash
   2
   3 usage() {
   4         cat <<EOF
   5 Usage: imgcrush [options] <files>
   6 EOF
   7         exit ${1:-0}
   8 }
   9
  10 crush_jpg() {
  11         local img="$1"
  12         jpegoptim "${img}"
  13 }
  14
  15 crush_png() {
  16         local img="$1"
  17         # apngopt likes to corrupt images.
  18         pngcrush -e .png.new "${img}"
  19         mv "${img}.new" "${img}"
  20 }
  21
  22 crush() {
  23         case $1 in
  24         *.jpg|*.jpeg) crush_jpg "$1" ;;
  25         *.png)        crush_png "$1" ;;
  26         *) echo "${0##*/}: unsupported format: $1" >&2 ;;
  27         esac
  28 }
  29
  30 main() {
  31         set -e
  32
  33         while [[ $# -ne 0 ]] ; do
  34                 case $1 in
  35                 -h) usage ;;
  36                 -x) set -x; shift ;;
  37                 -*) usage 1 ;;
  38                 *)  crush "$1"; shift ;;
  39                 esac
  40         done
  41 }
  42 main "$@"