[PATCH 080/105] gnu: Add ghc-semigroupoids.

[Paul van der Walt]

* gnu/packages/haskell.scm (ghc-semigroupoids): New variable.
---
 gnu/packages/haskell.scm | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index cd83b04..88944dc 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -3143,6 +3143,46 @@ are implemented as FFI bindings to efficient code from 
zlib.")
     (description "Bifunctors")
     (license bsd-3)))
 
+(define-public ghc-semigroupoids
+  (package
+    (name "ghc-semigroupoids")
+    (version "5.0.0.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "http://hackage.haskell.org/package/semigroupoids/semigroupoids-";
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "1jf7jnfhdvl6p18wdr21yi2fim1xb8alcn6szhrdswj0dkilgq6d"))))
+    (build-system haskell-build-system)
+    (propagated-inputs
+     `(("ghc-base-orphans" ,ghc-base-orphans)
+       ("ghc-transformers-compat" ,ghc-transformers-compat)
+       ("ghc-bifunctors" ,ghc-bifunctors)
+       ("ghc-comonad" ,ghc-comonad)
+       ("ghc-contravariant" ,ghc-contravariant)
+       ("ghc-distributive" ,ghc-distributive)))
+    (arguments `(#:tests? #f)) ;; FIXME: test framework unavailable
+    (inputs
+     `(("ghc-semigroups" ,ghc-semigroups)
+       ("ghc-tagged" ,ghc-tagged)
+       ("ghc-doctest" ,ghc-doctest)))
+    (home-page
+     "http://github.com/ekmett/semigroupoids";)
+    (synopsis "Semigroupoids: Category sans id")
+    (description
+     "Provides a wide array of (semi)groupoids and operations for working with
+them.  A 'Semigroupoid' is a 'Category' without the requirement of identity
+arrows for every object in the category.  A 'Category' is any 'Semigroupoid'
+for which the Yoneda lemma holds.  Finally, to work with these weaker
+structures it is beneficial to have containers that can provide stronger
+guarantees about their contents, so versions of 'Traversable' and 'Foldable'
+that can be folded with just a 'Semigroup' are added.")
+    (license bsd-3)))
+
 (define-public ghc-contravariant
   (package
     (name "ghc-contravariant")
-- 
2.6.1