Adds the branch name to the beginning of the commit message if the branch name is something like DEV-123 (3 letters-3numbers)

prepare-commit-msg

#!/bin/bash
# Include any branches for which you wish to disable this script
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=(master develop staging test)
fi

# Get the current branch name and check if it is excluded
BRANCH_NAME=$(git symbolic-ref --short HEAD)

BRANCH_NAME_VALID_FORMAT=$(echo $BRANCH_NAME | grep -c -E "^\w{3,}-\d{3,}$")

if ! [[ $BRANCH_NAME_VALID_FORMAT -eq 1 ]]; then 
    exit 0;
fi

BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")
ALREADY_INCLUDED=$(cat "$1" | grep -c "\[$BRANCH_NAME\]")
# Trim it down to get the parts we're interested in

TRIMMED=$(echo $BRANCH_NAME | sed -e 's:^\([^-]*-[^-]*\)-.*:\1:' -e \
    'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/')

# If it isn't excluded, preprend the trimmed branch identifier to the given message
if ! [[ $ALREADY_INCLUDED -eq 1 ]] && [ -n "$BRANCH_NAME" ] &&  ! [[ $BRANCH_EXCLUDED -eq 1 ]]; then
  sed -i.bak -e "1s/^/\[$BRANCH_NAME\] /" $1
fi

Original one was taken from https://medium.com/@nicklee1/prepending-your-git-commit-messages-with-user-story-ids-3bfea00eab5a

Only need to copy the file in your .git/hooks dir