public static IEnumerable<string> Update(Repo[] repos, Ref[] allNewRefs)
{
Dictionary<Repo, Ref[]> updates = new Dictionary<Repo, Ref[]>();
var oldRefs = repos.SelectMany(r => r.Refs).ToArray();
foreach (var repo in repos)
{
var newRefs = allNewRefs.Where(r => r.Alias == repo.Alias).ToArray();
updates[repo] = newRefs;
foreach (var r in newRefs)
{
/* determine what happened */
var existingRef = repo.Refs.FirstOrDefault(q => q.Name == r.Name);
if (existingRef != null && existingRef.Sha == r.Sha)
continue;
yield return CharacterizeChange(existingRef, r, oldRefs);
}
foreach (var q in repo.Refs)
if (!newRefs.Any(r => r.Name == q.Name))
yield return CharacterizeChange(q, null, oldRefs);
}
foreach (var repo in repos)
repo.Refs = updates[repo];
}
