gnu: Add julia-macrotools.

* gnu/packages/julia-xyz.scm (julia-macrotools-0.5.1): New variable.

gnu/packages/julia-xyz.scm

@@ -891,3 +891,30 @@ The goals of this package is to be:
 built-in parser by providing additional meta information along with the
 resultant AST.")
     (license license:expat)))
+
+(define-public julia-macrotools
+  (package
+    (name "julia-macrotools")
+    (version "0.5.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/MikeInnes/MacroTools.jl")
+             (commit (string-append "v" version))))
+       (file-name "MacroTools")
+       (sha256
+        (base32 "0sspp8na3cj7pni1b3dqzzpv2mkzln4f5w0n0wrh2jvn8rz1fjjx"))))
+    (propagated-inputs `(("julia-compat" ,julia-compat)
+                         ("julia-tokenize" ,julia-tokenize)
+                         ("julia-datastructures" ,julia-datastructures)
+                         ("julia-cstparser" ,julia-cstparser)))
+    (build-system julia-build-system)
+    (home-page "https://mikeinnes.github.io/MacroTools.jl/stable/")
+    (synopsis "MacroTools provides a library for working with Julia code and
+expressions")
+    (description "MacroTools provides a library of tools for working with
+Julia code and expressions.  This includes a powerful template-matching system
+and code-walking tools that let you do deep transformations of code in a few
+lines.Julia code and expressions.")
+    (license license:expat)))