prefixes commit message with path of changed files. useful in mono-repo setup

prepare-commit-msg

#!/bin/sh

prefixes=$(git diff --cached --name-only | while read f ; do echo "${f%/*}" ; done | sort | uniq)
prefixes_count=$(echo $prefixes | wc -l)
if [ "$prefixes_count" -eq "1" ]; then
    sed -i "1s;^;$prefixes: \n;" "$1"
fi