From ea43692918c8742a982eaf0701c751661a263890 Mon Sep 17 00:00:00 2001
From: Shane Celis <shane.celis@gmail.com>
Date: Thu, 8 Jun 2023 05:54:14 -0400
Subject: [PATCH] feature: Make usable without atty.

---
 Cargo.toml     |  4 +++-
 src/control.rs | 11 +++++++++--
 src/lib.rs     |  1 +
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 170c690..cdd3062 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,11 +11,13 @@ readme = "README.md"
 keywords = ["color", "string", "term", "ansi_term", "term-painter"]
 
 [features]
+default = ["tty"]
+tty = ["dep:atty"]
 # with this feature, no color will ever be written
 no-color = []
 
 [dependencies]
-atty = "0.2"
+atty = { version = "0.2", optional = true }
 lazy_static = "1"
 
 [target.'cfg(windows)'.dependencies.winapi]
diff --git a/src/control.rs b/src/control.rs
index 7ad6e62..c229445 100644
--- a/src/control.rs
+++ b/src/control.rs
@@ -103,9 +103,16 @@ impl ShouldColorize {
     /// `CLICOLOR_FORCE` takes highest priority, followed by `NO_COLOR`,
     /// followed by `CLICOLOR` combined with tty check.
     pub fn from_env() -> Self {
+        #[allow(unused_mut)]
+        let mut tty: Option<bool> = None;
+
+        #[cfg(feature = "tty")]
+        {
+            tty = Some(atty::is(atty::Stream::Stdout));
+        }
         ShouldColorize {
-            clicolor: ShouldColorize::normalize_env(env::var("CLICOLOR")).unwrap_or_else(|| true)
-                && atty::is(atty::Stream::Stdout),
+            clicolor: ShouldColorize::normalize_env(env::var("CLICOLOR")).unwrap_or(true)
+                && tty.unwrap_or(false),
             clicolor_force: ShouldColorize::resolve_clicolor_force(
                 env::var("NO_COLOR"),
                 env::var("CLICOLOR_FORCE"),
diff --git a/src/lib.rs b/src/lib.rs
index 1158c2a..308992e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -25,6 +25,7 @@
 //!
 #![warn(missing_docs)]
 
+#[cfg(feature = "tty")]
 extern crate atty;
 #[macro_use]
 extern crate lazy_static;