gnu: Add julia-cascadia.

* gnu/packages/julia-xyz.scm (julia-cascadia-0.4.0): New variable.

gnu/packages/julia-xyz.scm

@@ -2193,3 +2193,25 @@ HTML")
     (description "@code{Gumbo.jl} is a Julia wrapper around Google's gumbo
 library for parsing HTML.")
     (license license:expat)))
+
+(define-public julia-cascadia
+  (package
+    (name "julia-cascadia")
+    (version "0.4.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/Algocircle/Cascadia.jl")
+             (commit (string-append "v" version))))
+       (file-name "Cascadia")
+       (sha256
+        (base32 "0jfz2p94y9l62fa6si9hfb7czhj26i9n1p7gzb9vz1x32v2q2gdp"))))
+    (propagated-inputs `(("julia-gumbo" ,julia-gumbo)
+                         ("julia-abstracttrees" ,julia-abstracttrees)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/Algocircle/Cascadia.jl")
+    (synopsis "CSS Selector library in Julia")
+    (description "A CSS Selector library in Julia, inspired by, and mostly a
+direct translation of, the Cascadia CSS Selector library, written in Go,")
+    (license license:expat)))