commit-msg.sh

#!/bin/bash

TICKET_REGEX="^(([a-zA-Z]+)\-([0-9]+))"
BRANCH_REGEX="^(feature|chore)\/(([a-zA-Z]+)\-([0-9]+))\-.*"

branch=$(git branch --show-current)

if [[ $branch =~ $BRANCH_REGEX ]]; then    
    ticket="${BASH_REMATCH[2]}"
    content=$(cat $1 | grep -v '^#')    
    if [[ -z "${content// }" ]]; then
        exit 0 # empty message
    fi    
    if [[ $content =~ $TICKET_REGEX ]]; then        
        if [[ ${BASH_REMATCH[1]} -ne $ticket ]]; then
            echo "Warning: Different Ticket ID '${BASH_REMATCH[1]}' (vs '${ticket}') already prepended to commit message"
            exit 1
        else
            exit 0 # already prepended
        fi
    fi
    echo "${ticket} ${content}" > $1
    echo "Ticket ID '${ticket}' prepended to commit message"
fi