restore compatibility with supports-color v2

Cargo.toml

@@ -25,8 +25,14 @@ name = "override"
 required-features = ["supports-colors"]
 
 [features]
-supports-colors = ["supports-color"]
+# Enable conversions from all versions of supports-color, but only use the latest to determine if
+# colors are actually supported.
+#
+# Don't use dep:supports-color because it's possible there's a broken crate in the wild which uses
+# the nonfunctional "supports-color" feature.
+supports-colors = ["dep:supports-color-2", "supports-color"]
 alloc = []
 
 [dependencies]
+supports-color-2 = { package = "supports-color", version = "2.0", optional = true }
 supports-color = { version = "3.0.0", optional = true }

src/supports_colors.rs

@@ -1,9 +1,5 @@
 use core::fmt;
 
-mod private {
-    pub(super) trait Sealed {}
-}
-
 #[cfg(feature = "supports-colors")]
 /// A display wrapper which applies a transformation based on if the given stream supports
 /// colored terminal output
@@ -39,6 +35,15 @@ impl From<supports_color::Stream> for Stream {
     }
 }
 
+impl From<supports_color_2::Stream> for Stream {
+    fn from(stream: supports_color_2::Stream) -> Self {
+        match stream {
+            supports_color_2::Stream::Stdout => Self::Stdout,
+            supports_color_2::Stream::Stderr => Self::Stderr,
+        }
+    }
+}
+
 macro_rules! impl_fmt_for {
     ($($trait:path),* $(,)?) => {
         $(
@@ -82,3 +87,24 @@ impl_fmt_for! {
     fmt::Octal,
     fmt::Pointer,
 }
+
+#[cfg(test)]
+mod test {
+    use crate::OwoColorize;
+
+    use super::*;
+
+    #[test]
+    fn test_supports_color_versions() {
+        println!(
+            "{}",
+            "This might be green"
+                .if_supports_color(supports_color_2::Stream::Stdout, |x| x.green())
+        );
+
+        println!(
+            "{}",
+            "This might be red".if_supports_color(supports_color::Stream::Stdout, |x| x.red())
+        );
+    }
+}