func diffRange(repo *git.Repository, commitRange *gg.CommitRange, contextLines uint32) result.Result {
return result.Combine(func(values ...interface{}) result.Result {
opts := values[2].(git.DiffOptions)
opts.ContextLines = contextLines
return result.NewResult(repo.DiffTreeToTree(
values[0].(*git.Tree),
values[1].(*git.Tree),
&opts))
}, commitTree(commitRange.Parent), commitTree(commitRange.Child), diffOptions())
}
