#!/usr/bin/env sh

################################################################################

# When on a branch referring to a Jira issue,

# ensure commit messages start with the issue reference

default_pattern="[A-Z]{2}-[0-9]+"

jira_code_pattern="${JIRA_CODE_PATTERN:-$default_pattern}"

current_branch=$(git rev-parse --abbrev-ref HEAD)

issue_code=$(echo "${current_branch}" | grep -Eo "$jira_code_pattern" | tail -n1)

[ -n "$issue_code" ] || exit 0 # No issue code detected

current_msg=$(cat "$1")

msg_code=$(echo "${current_msg}" | grep -iEo "$jira_code_pattern" | tail -n1)

[ -z "$msg_code" ] || exit 0 # existing issue code in message

if case "$current_msg" in "fixup! "*) ;; *) false;; esac; then

exit 0 # don't alter fixup messages

fi

echo "Prefixing message with issue code: $issue_code" >&2

sed -i.bak -e "1s/^/$issue_code /" "$1"