Auto increment version number using git-hook on commit

pre-commit

#!/bin/sh

MESSAGE="$1"
VERSION_PATH=`git rev-parse --show-toplevel`"/style.css"

VER_TOKEN="Version:"
VER_STR=$(grep "$VER_TOKEN" $VERSION_PATH | awk '{print $2}' | tr -d '"')

VER_MAJ=$(echo $VER_STR | awk -F. '{print $1}')
VER_MIN=$(echo $VER_STR | awk -F. '{print $2}')
VER_PAT=$(echo $VER_STR | awk -F. '{print $3}')

applyVersion()
{
  VER_STR=$VER_MAJ"."$VER_MIN"."$VER_PAT
  VER_LINE=$VER_TOKEN" "$VER_STR

  sed -i $VERSION_PATH -e 's/'"$VER_TOKEN"'\(\s*\).*/'"$VER_TOKEN"'\1'"$VER_STR"'/g'
  git add $VERSION_PATH
  #git commit -m "version update: "$VER_STR
}

onVMAJ()
{
  let VER_MAJ++
  VER_MIN=0
  VER_PAT=0
  applyVersion
}

onVMIN()
{
  let VER_MIN++
  VER_PAT=0
  applyVersion
}

onVPAT()
{
  let VER_PAT++
  applyVersion
}

case "$MESSAGE" in
  *vmaj++* ) onVMAJ;;
  *vmin++* ) onVMIN;;
  *vpat++* ) onVPAT;;
  * ) onVPAT;;
esac

exit