Output changed file paths and lines based on git diff

diff-to-yaml.sh

#!/bin/bash -e
path='^\+\+\+ .\/(.*)'
hunk='^@@ -[0-9]+(,[0-9]+|) \+([0-9]+)(,([0-9]+|)|) @@'

while read -r line
do 
    if [[ $line =~ $path ]]
    then 
        echo "${BASH_REMATCH[1]}:"
    fi
    
    if [[ $line =~ $hunk ]]
    then 
        echo " - start: ${BASH_REMATCH[2]}"
        echo "   count: ${BASH_REMATCH[4]:-1}"
    fi

done < <(git diff --unified=0)