make a git tracked file lower

git-mv-lower.sh

#!/bin/sh

if [ $# -eq 0 ]; then
  echo "you need to pass a file or directory name to the command"
  exit 1
fi

if [ ! -e $1 ]; then
  echo "file not exists"
  exit 1
fi

if [ ! -d $1 ]; then
  echo "this is not a directory."
  exit 1
fi

to_lower() {
  input=$(echo $1 | tr '[A-Z]' '[a-z]')
  echo $input
}

git_mv_lower() {
  org=$(to_lower $1)
  git mv $1 _tmp
  git mv _tmp $org
}

git_mv_lower $1