From fd877516f85ad8dcbef5f4fa29c91d17d4c19f48 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Tue, 23 Feb 2016 19:56:30 -0500
Subject: guix: Allow building package with Guile 2.2 pre-release.

---
 guix.scm | 96 +++++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 56 insertions(+), 40 deletions(-)

diff --git a/guix.scm b/guix.scm
index c3216b8..8f26a04 100644
--- a/guix.scm
+++ b/guix.scm
@@ -52,6 +52,24 @@
              (gnu packages maths)
              (gnu packages image))
 
+(define use-guile-2.2?
+  (string? (getenv "SLY_GUILE_NEXT")))
+
+(define (package-with-guile p guile)
+  (package
+    (inherit p)
+    (inputs
+     (map (match-lambda
+            (("guile" _)
+             `("guile" ,guile))
+            (input input))
+          (package-inputs p)))))
+
+(define (package-with-guile-next-maybe p)
+  (if use-guile-2.2?
+      (package-with-guile p guile-next)
+      p))
+
 (define guile-sdl2
   (package
    (name "guile-sdl2")
@@ -60,10 +78,10 @@
             (method git-fetch)
             (uri (git-reference
                   (url "git://dthompson.us/guile-sdl2.git")
-                  (commit "65c8e4d")))
+                  (commit "55c4eef")))
             (sha256
              (base32
-              "0l2z7j5jy5v1zcrjvngnfqlla9975syjbgsixjz2r7fy83zd0xa8"))))
+              "1yckf6n2iwp5l3yz4y0rks5qbylnmfnpcxmlwl74aqyqfxd586ix"))))
    (build-system gnu-build-system)
    (arguments
     '(#:configure-flags
@@ -102,43 +120,41 @@ SDL2 C shared library via the foreign function interface.")
    (home-page "https://git.dthompson.us/guile-sdl2.git")
    (license lgpl3+)))
 
-(package
-  (name "sly")
-  (version "0.1")
-  (source (origin
-            (method git-fetch)
-            (uri (git-reference
-                  (url "git://dthompson.us/sly.git")
-                  (commit "9c8c44a")))
-            (sha256
-             (base32
-              "021af35c2yz7hm8ax3mbxnrma0fbijplakl0xy61gjg3w89bjsll"))))
-  (build-system gnu-build-system)
-  (arguments
-   '(#:phases
-     (modify-phases %standard-phases
-       (add-after 'unpack 'bootstrap
-         (lambda _ (zero? (system* "sh" "bootstrap")))))
-     #:configure-flags
-     (list (string-append "--with-libfreeimage-prefix="
-                          (assoc-ref %build-inputs "freeimage"))
-           (string-append "--with-libgslcblas-prefix="
-                          (assoc-ref %build-inputs "gsl")))))
-  (native-inputs
-   `(("pkg-config" ,pkg-config)
-     ("autoconf" ,autoconf)
-     ("automake" ,automake)
-     ("texinfo" ,texinfo)))
-  (propagated-inputs
-   `(("guile-sdl2" ,guile-sdl2)
-     ("guile-opengl" ,guile-opengl)))
-  (inputs
-   `(("guile" ,guile-2.0)
-     ("gsl" ,gsl)
-     ("mesa" ,mesa)))
-  (synopsis "2D/3D game engine for GNU Guile")
-  (description "Sly is a 2D/3D game engine written in Guile Scheme.
+(define sly
+  (package
+    (name "sly")
+    (version "0.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "git://dthompson.us/sly.git")
+                    (commit "9c8c44a")))
+              (sha256
+               (base32
+                "021af35c2yz7hm8ax3mbxnrma0fbijplakl0xy61gjg3w89bjsll"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'bootstrap
+           (lambda _ (zero? (system* "sh" "bootstrap")))))))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)
+       ("autoconf" ,autoconf)
+       ("automake" ,automake)
+       ("texinfo" ,texinfo)))
+    (propagated-inputs
+     `(("guile-sdl2" ,(package-with-guile-next-maybe guile-sdl2))
+       ("guile-opengl" ,(package-with-guile-next-maybe guile-opengl))))
+    (inputs
+     `(("guile" ,guile-2.0)
+       ("gsl" ,gsl)
+       ("mesa" ,mesa)))
+    (synopsis "2D/3D game engine for GNU Guile")
+    (description "Sly is a 2D/3D game engine written in Guile Scheme.
 Sly differs from most game engines in that it emphasizes functional
 reactive programming and live coding.")
-  (home-page "http://dthompson.us/pages/software/sly.html")
-  (license gpl3+))
+    (home-page "http://dthompson.us/pages/software/sly.html")
+    (license gpl3+)))
+
+(package-with-guile-next-maybe sly)
-- 
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