gnu: Add rust-atty.

* gnu/packages/crates-io.scm (rust-atty): New variable.

gnu/packages/crates-io.scm

@@ -50,6 +50,30 @@
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-atty
+  (package
+    (name "rust-atty")
+    (version "0.2.13")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "atty" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "140sswp1bwqwc4zk80bxkbnfb3g936hgrb77g9g0k1zcld3wc0qq"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-libc" ,rust-libc)
+        ("rust-winapi" ,rust-winapi))
+       #:tests? #f)) ; tests fail in our sandbox
+    (home-page "https://github.com/softprops/atty")
+    (synopsis "A simple interface for querying atty")
+    (description
+     "This package provides a simple interface for querying atty.")
+    (license license:expat)))
+
 (define-public rust-autocfg
   (package
     (name "rust-autocfg")