v.util.diff #
fn color_compare_files #
fn color_compare_files(diff_cmd string, file1 string, file2 string) string
fn color_compare_strings #
fn color_compare_strings(diff_cmd string, unique_prefix string, expected string, found string) string
fn find_working_diff_command #
fn find_working_diff_command() !string
iterates through a list of known diff cli commands and returns it with basic options