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authorJohn Soo <jsoo1@asu.edu>2019-12-13 07:04:13 -0800
committerChristopher Baines <mail@cbaines.net>2020-05-08 09:53:24 +0100
commit460e4e42c8a5c2a1a73772916165f3c434ee46c9 (patch)
tree044c324a96d48857c12b7da6ae1e6b7ec1c784db
parentd7ad08239be312e48c18487bf4b6cc173970de6d (diff)
gnu: Add ghc-transformers.
* gnu/packages/haskell-xyz.scm (ghc-transformers): New variable. Signed-off-by: Christopher Baines <mail@cbaines.net>
-rw-r--r--gnu/packages/haskell-xyz.scm39
1 files changed, 39 insertions, 0 deletions
diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index 1ff6f30141..6a4d958490 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -12127,6 +12127,45 @@ from a shell. The @code{tldr} pages are a community effort to simplify the
man pages with practical examples.")
(license license:bsd-3)))
+(define-public ghc-transformers
+ (package
+ (name "ghc-transformers")
+ (version "0.5.6.2")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append
+ "mirror://hackage/package/transformers/transformers-"
+ version
+ ".tar.gz"))
+ (sha256
+ (base32
+ "0v66j5k0xqk51pmca55wq192qyw2p43s2mgxlz4f95q2c1fpjs5n"))))
+ (build-system haskell-build-system)
+ (home-page
+ "http://hackage.haskell.org/package/transformers")
+ (synopsis "Concrete functor and monad transformers")
+ (description
+ "Transformers provides functor and monad transformers, inspired by the
+paper \"Functional Programming with Overloading and Higher-Order
+Polymorphism\", by Mark P Jones, in Advanced School of Functional Programming,
+1995 @url{http://web.cecs.pdx.edu/~mpj/pubs/springschool.html}.
+
+This package contains:
+@itemize
+@item the monad transformer class (in @code{Control.Monad.Trans.Class})
+@item concrete functor and monad transformers, each with associated operations
+and functions to lift operations associated with other transformers.
+@end itemize
+
+This package can be used on its own in portable Haskell code, in which case
+operations need to be manually lifted through transformer stacks (see
+@code{Control.Monad.Trans.Class} for some examples). Alternatively, it can be
+used with the non-portable monad classes in the mtl or monads-tf packages,
+which automatically lift operations introduced by monad transformers through
+other transformers.")
+ (license license:bsd-3)))
+
(define-public ghc-transformers-base
(package
(name "ghc-transformers-base")