summary.additions = 0;
        summary.deletions = 0;

        summary.files.forEach(file => {
            let fileMetadata = metadataFor(fileMetadatas, file);
            summary.additions += fileMetadata.additions;
            summary.deletions += fileMetadata.deletions;
            totalAdditions += fileMetadata.additions;
            totalDeletions += fileMetadata.deletions;
            totalChangedFiles++;
        });

    let preppedStatistics = statistics.filter(s => s.files.length > 0)
        .sort(s => -(s.additions + s.deletions));

    let totalAdditions = Object.values(preppedStatistics).reduce((acc, summary) => acc + summary.additions, 0);
    let totalDeletions = Object.values(preppedStatistics).reduce((acc, summary) => acc + summary.deletions, 0);
    let newRatio = totalAdditions / (totalAdditions + totalDeletions) * 100;