#!/bin/sh

args_chk=`echo "$@" | md5 -q`

cache_dir=$HOME/.dcache
[ ! -d "$cache_dir" ] && mkdir $cache_dir

cache_file="$cache_dir/$args_chk"

if [ -f "$cache_file" ] ; then
  echo "Using cache..." >&2
  cpio --absolute-filenames --quiet -d -i < $cache_file
else
  echo "Running original..." >&2
  output=/tmp/dcache.$$
  truss -o $output -Sfa "$@"
  egrep 'open\("[^"]+",.*O_(WRONLY|APPEND|CREAT|TRUNC).*,' $output \
  | awk -F\" '{printf("%s\0", $2)}' \
  | cpio --quiet -o0H ustar > $cache_file 
  rm $output
fi