Extract JIRA ticket name from the branch name and prepare commit message

prepare-commit-msg

#!/bin/bash
#
# Succeed on all merge and rebase messages, as evidenced by MERGE_MSG and SQUASH_MSG existing
[ -f "$GIT_DIR"/MERGE_MSG ] || [ -f "$GIT_DIR"/SQUASH_MSG ] && exit 0

JIRA_TAG_PATTERN="mnlth-[0-9]+"

BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD 2> /dev/null \
| grep -oiE "$JIRA_TAG_PATTERN" \
| tr '[:lower:]' '[:upper:]')

USER_MSG=$(cat $1)
MSG=$(echo $USER_MSG | tr '[:upper:]' '[:lower:]')

if [[ -n "$BRANCH_NAME" && !($MSG =~ $JIRA_TAG_PATTERN) ]];  then
    sed -i '' "1s/^/$BRANCH_NAME /g" $1
fi