How to automatically prepend git commit with a branch name

prepare-commit-msg.sh

#!/usr/bin/env bash

BRANCHES_TO_SKIP=(master develop test)

BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_NAME="${BRANCH_NAME##*/}"

DASHES="${BRANCH_NAME//[^-]}"

if [ ${#DASHES} -gt 1 ]; then
    IFS='-' read -r -a array <<< $BRANCH_NAME
    BRANCH_NAME="${array[0]}"-"${array[1]}"
fi

BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")
BRANCH_IN_COMMIT=$(grep -c "\[$BRANCH_NAME\]" $1)

if [ -n "$BRANCH_NAME" ] && ! [[ $BRANCH_EXCLUDED -eq 1 ]] && ! [[ $BRANCH_IN_COMMIT -ge 1 ]]; then
  sed -i.bak -e "1s/^/[$BRANCH_NAME] /" $1
fi