#!/bin/sh
#
# pngcrush_batch  png png png...
#
# Run pngcrush batch-wise over a list of png files,
# to compress them by the maximum amount without dataloss.
#

umask 77
tmp=`mktemp "${TMPDIR:-/tmp}/pngcrush_batch.XXXXXXXXXX"` ||
  { echo >&2 "$PROGNAME: Unable to create temporary file"; exit 10;}
trap 'rm -f "$tmp"' 0
trap 'exit 2' 1 2 3 15

for i in "$@"; do
   echo "--------------------------------------"
   echo "$i"
   echo "--------------------------------------"
   pngcrush "$i" $tmp
   if [ $? -eq 0 -a -s $tmp ]; then
     mv $tmp "$i"
   else
     echo >&2 "Pngcrush failed for file \"$i\" -- ABORTING"
     exit 1
   fi
done