Git prepare-commit-msg hook for projects dealing with JIRA

prepare-commit-msg

#!/bin/bash

# Succeed on all merge messages, as evidenced by MERGE_MSG existing
[ -f $GIT_DIR/MERGE_MSG ] && exit 0

BRANCH=$(git branch | grep '*' | sed 's/* //')

read -r -d '' HELP_TEXT << EOM
# 1. Separate subject from body with a blank line
# 2. Limit the subject line to 50 characters
# 3. Capitalize the subject line
# 4. Do not end the subject line with a period
# 5. Use the imperative mood in the subject line
# 6. Wrap the body at 72 characters
# 7. Use the body to explain what and why vs. how
EOM

# Don't apply this logic if we are in a 'detached head' state (rebasing, read-only history, etc)
if [[ ${BRANCH} != *"no branch"* ]]; then
	JIRA_ID=$(echo $BRANCH | grep -Eow "SP-[0-9]+")
	JIRA_LINK="https://springboard-edu.atlassian.net/browse/$JIRA_ID"
	echo -e "\nFeature branch: $BRANCH" >> "$1"
	echo -e "Jira Link: $JIRA_LINK\n" >> "$1"
fi

echo "$HELP_TEXT" >> $1