How to automatically prepend git commit with a branch name

prepare-commit-msg.sh

#!/bin/bash

# Create branch name with JIRA code in this format ABC-123
# JIRA code needs to be in capitals divided by - and followed by numerals
# Branch example: css_minified_ABC-123 or ABC-123_css_minified
# Use github desktop or $ git commit -m "Recompiled css into minified version"
# this will result with commit "[ABC-123] Recompiled css into minified version"


# Installation
# navigate to root of project
# curl https://gist.githubusercontent.com/hoektoe/5c6a658a24bb25932f4cbd71a1853eb0/raw/baf9b7f24e3ebf085977250428670e9ab0e368d5/prepare-commit-msg.sh > .git/hooks/prepare-commit-msg && chmod u+x .git/hooks/prepare-commit-msg

# Customize which branches should be skipped when prepending commit message. 
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=(master develop test)
fi

BRANCH_NAME=$(git symbolic-ref --short HEAD | grep -o '[A-Z]\+-[0-9]\+')
BRANCH_NAME="${BRANCH_NAME##*/}"

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