[PATCH 05/15] gnu: Add chez-matchable.

[Federico Beffa <beffa@ieee.org>]

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From 5821d3e41e37df01492141f128a0a09b5e70498f Mon Sep 17 00:00:00 2001
From: Federico Beffa <beffa@fbengineering.ch>
Date: Sun, 16 Oct 2016 16:08:33 +0200
Subject: [PATCH 05/15] gnu: Add chez-matchable.

* gnu/packages/chez.scm (chez-matchable): New variable.
---
 gnu/packages/chez.scm | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/chez.scm b/gnu/packages/chez.scm
index 6579b81..bc763df 100644
--- a/gnu/packages/chez.scm
+++ b/gnu/packages/chez.scm
@@ -19,7 +19,8 @@
 (define-module (gnu packages chez)
   #:use-module (gnu packages)
   #:use-module ((guix licenses)
-                #:select (gpl2+ lgpl2.0+ lgpl2.1+ asl2.0 bsd-3 expat))
+                #:select (gpl2+ lgpl2.0+ lgpl2.1+ asl2.0 bsd-3 expat
+                          public-domain))
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix git-download)
@@ -347,3 +348,52 @@ Chez Scheme.")
     (description "Chez-sockets is an extensible sockets library for
 Chez Scheme.")
     (license expat)))
+
+;; Help function for Chez Scheme to add the current path to
+;; CHEZSCHEMELIBDIRS.
+(define chez-configure
+  '(lambda _
+     (let ((chez-env (getenv "CHEZSCHEMELIBDIRS")))
+       (setenv "CHEZSCHEMELIBDIRS"
+               (if chez-env
+                   (string-append ".:" chez-env)
+                   "."))
+       #t)))
+
+;; Help function to define make flags for some Chez Scheme custom make
+;; files.
+(define (chez-make-flags name version)
+  `(let ((out (assoc-ref %outputs "out")))
+     (list (string-append "PREFIX=" out)
+           (string-append "DOCDIR=" out "/share/doc/"
+                          ,name "-" ,version))))
+
+(define-public chez-matchable
+  (package
+    (name "chez-matchable")
+    (version "20160306")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/fedeinthemix/chez-matchable/archive"
+             "/v" version ".tar.gz"))
+       (sha256
+        (base32 "0cl4vc6487pikjq159pj4n5ghyaax31nywb5n4yn1682h3ir1hs0"))
+       (file-name (string-append name "-" version ".tar.gz"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("chez-srfi" ,chez-srfi))) ; for tests
+    (native-inputs
+     `(("chez-scheme" ,chez-scheme)))
+    (arguments
+     `(#:make-flags ,(chez-make-flags name version)
+       #:test-target "test"
+       #:phases (modify-phases %standard-phases
+                  (replace 'configure ,chez-configure))))
+    (home-page "https://github.com/fedeinthemix/chez-matchable")
+    (synopsis "Portable hygienic pattern matcher for Scheme")
+    (description "This package provides a superset of the popular
+Scheme 'match' package by Andrew Wright, written in fully portable
+'syntax-rules' and thus preserving hygiene.")
+    (license public-domain)))
-- 
2.7.4