Automatically include ticket number from branch name into git commit messages

prepare-commit-msg

#!/bin/bash
# If you use branch names with JIRA ticket numbers in them, e.g. feature/ABC-4324-do-something,
# this includes automatically the ticket number (ABC-4324) at the start of the the commit message.
# This way, it's later easy to see which change was done for which ticket, without any manual effort.
# You need to copy or link this file into .git/hooks/prepare-commit-msg

# You can 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`
if [[ $BRANCH_NAME =~ /([A-Z]{1,4}-[0-9]{1,4}) ]]; then
    TICKET_NAME=${BASH_REMATCH[1]}
fi

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

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