Git hook to automatically prepend Jira ticket id to commit

prepare-commit-msg

#!/bin/sh

COMMIT_FILE=$1
COMMIT_MSG=$(cat $1)
CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
JIRA_ID=$(echo "$CURRENT_BRANCH" | grep -Eo "[A-Z0-9]{1,10}-?[A-Z0-9]+-\d+")
IN_COMMIT=$(grep -c "$JIRA_ID:" $1)

if ! [[ $IN_COMMIT -ge 1 ]] && [ ! -z "$JIRA_ID" ]; then 
    echo "$JIRA_ID: $COMMIT_MSG" > $COMMIT_FILE
    echo "JIRA ID '$JIRA_ID' matched in current branch name, prepended to commit message. (Use --no-verify to skip)"
fi

Instructions on how to enable this globally can be found here: https://coderwall.com/p/jp7d5q/create-a-global-git-commit-hook