// checkCommentLocation verifies that the given location exists at the given commit.
func checkCommentLocation(repo repository.Repo, commit, file string, line uint) error {
contents, err := repo.Show(commit, file)
if err != nil {
return err
}
lines := strings.Split(contents, "\n")
if line > uint(len(lines)) {
return fmt.Errorf("Line number %d does not exist in file %q", line, file)
}
return nil
}