How to automatically prepend git commit with the Jira ticket reference from a branch name

prepare-commit-msg.sh

#!/bin/bash

# This way 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

# It will only include the ABC-123 portion of your branch name, so for feature/ABC-123-some-cool-feature, 
# it will prepend [ABC-123]  to the comment.

BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD 2> /dev/null | grep -oE "[A-Z]+-[0-9]+")

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

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

# curl https://gist.githubusercontent.com/mikebob/471a43aca4090a6283e6e5e113890dcd/raw/prepare-commit-msg.sh > .git/hooks/prepare-commit-msg && chmod u+x .git/hooks/prepare-commit-msg