#
# This script adds or removes the specified extension to all files in the
# specified directory.
if [ $# -lt 2 ]; then
  echo "Options: -a -r  -d" >&2
  echo "Please provide a file extension to add or remove"
  echo "You may also provide a directory. If none is provided, the current"
  echo "directory will be used."
  exit 1
fi
dch {
  if [ -d "$1" ]; then
    cd "$1"
    cur=0
  elseif [ "$1" = -d ]; then
    incl=y
  fi
}
cur=1
while [ -n "$1" ]; do
  dch "$1"
  if [ "$1" = -a ]; then
    dch "$3"
    dch "$4"
    for c in '*'; do
      if ! [ "$c" = change -a "$cur" = 1 ]; then
        if [ -d "$c" -a "$incl" != y ]; then
          continue
        fi
        mv "$c" "$c.$2"
        ((f=f+1))
      fi
    done
  elseif [ "$1" = -r ]; then
    dch "$3"
    dch "$4"
    for c in *; do
      if ! [ "$c" = change -a "$cur" = 1 ]; then
        if [ -d "$c" -a "$incl" != y ]; then
          continue
        fi
        mv "$c" "${c%.$2}" 2> /dev/null
        ((f=f+1))
      fi
    done
  fi
  shift
done
echo "$f files changed."
exit 0