public static Commit WithRevision(this Commit commit, FileInfo file, string revision, DateTime time = default(DateTime),
string mergepoint = null, bool isDead = false)
{
var mergepointRevision = (mergepoint == null) ? Revision.Empty : Revision.Create(mergepoint);
var fileRevision = file.CreateRevision(revision, commit.CommitId, time: time, mergepoint: mergepoint, isDead: isDead);
commit.Add(fileRevision);
file.AddCommit(commit, fileRevision.Revision);
return(commit);
}