chore: replace atty with is-terminal

Cargo.toml

@@ -67,7 +67,7 @@ unstable-doc = ["derive", "cargo", "wrap_help", "env", "unicode", "string", "uns
 
 # Used in default
 std = [] # support for no_std in a backwards-compatible way
-color = ["dep:atty", "dep:termcolor"]
+color = ["dep:is-terminal", "dep:termcolor"]
 help = []
 usage = []
 error-context = []
@@ -96,7 +96,7 @@ clap_lex = { path = "./clap_lex", version = "0.3.0" }
 bitflags = "1.2"
 unicase = { version = "2.6", optional = true }
 strsim = { version = "0.10",  optional = true }
-atty = { version = "0.2",  optional = true }
+is-terminal = { version = "0.3",  optional = true }
 termcolor = { version = "1.1.1", optional = true }
 terminal_size = { version = "0.2.1", optional = true }
 backtrace = { version = "0.3", optional = true }

src/output/fmt.rs

@@ -82,10 +82,9 @@ impl std::fmt::Display for Colorizer {
 
 #[cfg(feature = "color")]
 fn is_a_tty(stream: Stream) -> bool {
-    let stream = match stream {
-        Stream::Stdout => atty::Stream::Stdout,
-        Stream::Stderr => atty::Stream::Stderr,
-    };
-
-    atty::is(stream)
+    use is_terminal::IsTerminal;
+    match stream {
+        Stream::Stdout => std::io::stdout().is_terminal(),
+        Stream::Stderr => std::io::stderr().is_terminal(),
+    }
 }