How to automatically prepend git commit with a branch name

prepare-commit-msg

#!/bin/bash

# Script provides effortless way of prepending Jira ticket number
# into a commit message.
# It is compatible with "git flow" naming approach for branches :: f.ex feature/AVENGERS-667.
 
# Installation
# Put this file into rootProject/.git/hooks dir.
# Make it executable. (with chmod)

COMMIT_MSG=$(<$1)
BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_NAME_PATTERN="(([A-Z]+|[a-z]+)-[0-9]+)"
BRANCHES_TO_SKIP=(master develop test)

SPLITTED=(${BRANCH_NAME//// })

BRANCH_TYPE=${SPLITTED[0]}
TICKET_NAME=${SPLITTED[1]}

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

if [ -n "$TICKET_NAME" ] && ! [[ ${BRANCH_EXCLUDED} -eq 1 ]] && ! [[ ${COMMIT_MSG} =~ $BRANCH_NAME_PATTERN ]] && [[ $2 != "" ]] ; then

  if [[ ${TICKET_NAME} =~ ${BRANCH_NAME_PATTERN} ]]; then
    TICKET_NAME=${BASH_REMATCH[1]}
  fi

  sed -i.bak -e "1s/^/$TICKET_NAME: /" $1
fi

Installation notes

1. Within repo root execute: cd .git/hooks/
2. Copy this file as a prepare-commit-msg into */hooks/ dir
3. Make it executable. F.ex with chmod 755 prepare-commit-msg
4. Return to root. Commit. Review commit message to see magic happened.