@@ -169,7 +169,8 @@ impl App {
169169 || match self.matches.value_of("color") {
170170 Some("always") => true,
171171 Some("never") => false,
172− _ => env::var_os("NO_COLOR").is_none() && self.interactive_output,
172+ Some("auto") => env::var_os("NO_COLOR").is_none() && self.interactive_output,
173+ _ => unreachable!("other values for --color are not allowed"),
173174 },
174175 paging_mode,
175176 term_width: maybe_term_width.unwrap_or(Term::stdout().size().1 as usize),