pre-commit hook that increases the version of a WP-Theme

pre-commit

#!/bin/bash

FILE=style.css
BRANCH=`git rev-parse --abbrev-ref HEAD`

# read every line and serach Version
while read line; do
    if [[ $line == *"Version: "* ]]; then
        VERSION=${line/Version: /}
    fi
done < $FILE

# strip linebreak and non version chars from $VERSION
VERSIONNUM="${VERSION//[!0-9.-]/}"

# generate new version
NEWVERSION="${VERSIONNUM%.*}.$((${VERSIONNUM##*.}+1))"

# add BRANCH to version if not master
if [[ $BRANCH != "master" ]]; then
	NEWVERSION="$BRANCH$NEWVERSION"
fi

# replace
sed -i -e 's/'"$VERSION"'/'"$NEWVERSION"'/g' $FILE
git add $FILE

# replace package.json
if [ -e package.json ]; then
	sed  -i '/version/s/[(0-9.",a-zA-Z)]*$/'"\"${NEWVERSION}\",/" package.json
	git add package.json
fi

# replace composer.json
if [ -e composer.json ]; then
	sed  -i '/version/s/[(0-9.",a-zA-Z)]*$/'"\"${NEWVERSION}\",/" composer.json
	git add composer.json
fi