Prepend JIRA ticket ID from branch name and validate if it is missing

commit-msg

#!/bin/sh
#
# To enable this hook, developers should place it in .git/hooks/.
#
# You may adapt the message length check. Currently checking it's longer than 15 characters.

# First try to populate the ticket prefix based on the active branch

# The current branch worked on
branch=`git symbolic-ref --short HEAD`

# The regular expression to match the ticket ID
regex='\(WM-[0-9]\{1,4\}\).*'

# The ticket ID extracted from the branch name
ticket=$(echo $branch | sed -e "s/^$regex/\1/");

# The prefix pattern prepended before each commit message
prefix="$ticket - "

msg_text=`grep -e ''"$regex"'' "$1"`
# Ticked ID is not in the commit message
if [ "$msg_text" == "" ]; then
  # Test if the ticket ID is not in the commit message and the branch name does not specify it either
  if [ "$ticket" == "" ]; then
    echo "No ticket ID found in the commit message."
    echo "Valid example: WM-14 - Adding Paragraph bundle to the generic page feature"
    exit 1
  # Ticket ID is not in the commit message, but present in the branch
  else
    sed "1s/^/$prefix /" $1 > $1.new
    mv $1.new $1
  fi
# Ticket ID is in the commit message, everything is fine
fi