`git stat` command

git-stat

#!/bin/sh
#
# To be placed in a directory that's present in $PATH.

usage() {
  cat <<EOF
Usage:  git stat [OPTIONS] [--] [<commit>]

Options:

  -h,--help                show this help
EOF
}

arg=""
params=()
while (( "$#" )); do
  case "$1" in
        -h|-\?|--help) usage; exit 0 ;;
        --)
          shift
          while (( "$#" )); do
            params+=("$1")
            shift
          done
          ;;
        -*|--*=) echo "unsupported option $1" >&2; exit 1 ;;
        *) params+=("$1"); shift ;;
  esac
done

if [ "${#params[@]}" -eq 0 ]; then
  params+=("HEAD")
fi

if [ "${#params[@]}" -ne 1 ]; then
  usage
  exit 1
fi

ref=$params

ignores=""
if [ -f $HOME/.gitstatignore ]; then
  ignores=$(< $HOME/.gitstatignore tr '\n' '\0'  | xargs -0 -I{} echo :\!{} | tr '\n' ' ')
fi

git diff $ref --shortstat -- . $ignores