libghc-lens-dev 3.10-2 / var / lib / ghc / package.conf.d / lens-3.10.conf

name: lens
version: 3.10
id: lens-3.10-03619beefb1567173b155cc1d50ddc17

license: BSD3
copyright: Copyright (C) 2012-2013 Edward A. Kmett
maintainer: Edward A. Kmett <ekmett@gmail.com>
stability: provisional
homepage: http://github.com/ekmett/lens/
package-url:
synopsis: Lenses, Folds and Traversals
description: This package comes \"Batteries Included\" with many useful lenses for the types
             commonly used from the Haskell Platform, and with tools for automatically
             generating lenses and isomorphisms for user-supplied data types.
             .
             The combinators in @Control.Lens@ provide a highly generic toolbox for composing
             families of getters, folds, isomorphisms, traversals, setters and lenses and their
             indexed variants.
             .
             An overview, with a large number of examples can be found in the @README@: <https://github.com/ekmett/lens#lens-lenses-folds-and-traversals>
             .
             A video on how to use lenses and how they are constructed is available from youtube: <http://youtu.be/cefnmjtAolY?hd=1>
             .
             Slides can be obtained here: <http://comonad.com/haskell/Lenses-Folds-and-Traversals-NYC.pdf>
             .
             More information on the care and feeding of lenses, including a brief tutorial and motivation
             for their types can be found on the lens wiki: <https://github.com/ekmett/lens/wiki>
             .
             A small game of @pong@ and other more complex examples that manage their state using lenses can be found in the example folder: <https://github.com/ekmett/lens/blob/master/examples/>
             .
             /Lenses, Folds and Traversals/
             .
             The core of the hierarchy of lens-like constructions looks like:
             .
             .
             <<http://i.imgur.com/4fHw3Fd.png>>
             .
             Local copy (<Hierarchy.png>)
             .
             You can compose any two elements of the hierarchy above using @(.)@ from the @Prelude@, and you can
             use any element of the hierarchy as any type it linked to above it.
             .
             The result is their lowest upper bound in the hierarchy (or an error if that bound doesn't exist).
             .
             For instance:
             .
             * You can use any 'Traversal' as a 'Fold' or as a 'Setter'.
             .
             * The composition of a 'Traversal' and a 'Getter' yields a 'Fold'.
             .
             /Minimizing Dependencies/
             .
             If you want to provide lenses and traversals for your own types in your own libraries, then you
             can do so without incurring a dependency on this (or any other) lens package at all.
             .
             /e.g./ for a data type:
             .
             > data Foo a = Foo Int Int a
             .
             You can define lenses such as
             .
             > -- bar :: Lens' (Foo a) Int
             > bar :: Functor f => (Int -> f Int) -> Foo a -> f (Foo a)
             > bar f (Foo a b c) = fmap (\a' -> Foo a' b c) (f a)
             .
             > -- baz :: Lens (Foo a) (Foo b) a b
             > quux :: Functor f => (a -> f b) -> Foo a -> f (Foo b)
             > quux f (Foo a b c) = fmap (Foo a b) (f c)
             .
             without the need to use any type that isn't already defined in the @Prelude@.
             .
             And you can define a traversal of multiple fields with 'Control.Applicative.Applicative':
             .
             > -- traverseBarAndBaz :: Traversal' (Foo a) Int
             > traverseBarAndBaz :: Applicative f => (Int -> f Int) -> Foo a -> f (Foo a)
             > traverseBarAndBaz f (Foo a b c) = Foo <$> f a <*> f b <*> pure c
             .
             What is provided in this library is a number of stock lenses and traversals for
             common haskell types, a wide array of combinators for working them, and more
             exotic functionality, (/e.g./ getters, setters, indexed folds, isomorphisms).
category: Data, Lenses
author: Edward A. Kmett
exposed: True
exposed-modules: Control.Lens.TH Language.Haskell.TH.Lens
                 Generics.Deriving.Lens GHC.Generics.Lens System.IO.Error.Lens
                 Control.Exception.Lens Control.Lens Control.Lens.Action
                 Control.Lens.At Control.Lens.Combinators Control.Lens.Cons
                 Control.Lens.Each Control.Lens.Equality Control.Lens.Fold
                 Control.Lens.Getter Control.Lens.Indexed Control.Lens.Internal
                 Control.Lens.Internal.Action Control.Lens.Internal.Bazaar
                 Control.Lens.Internal.ByteString Control.Lens.Internal.Context
                 Control.Lens.Internal.Deque Control.Lens.Internal.Exception
                 Control.Lens.Internal.Fold Control.Lens.Internal.Getter
                 Control.Lens.Internal.Indexed Control.Lens.Internal.Instances
                 Control.Lens.Internal.Iso Control.Lens.Internal.Level
                 Control.Lens.Internal.Magma Control.Lens.Internal.Prism
                 Control.Lens.Internal.Review Control.Lens.Internal.Setter
                 Control.Lens.Internal.Zipper Control.Lens.Internal.Zoom
                 Control.Lens.Iso Control.Lens.Lens Control.Lens.Level
                 Control.Lens.Loupe Control.Lens.Operators Control.Lens.Plated
                 Control.Lens.Prism Control.Lens.Reified Control.Lens.Review
                 Control.Lens.Setter Control.Lens.Simple Control.Lens.Traversal
                 Control.Lens.Tuple Control.Lens.Type Control.Lens.Wrapped
                 Control.Lens.Zipper Control.Lens.Zoom Control.Monad.Error.Lens
                 Control.Parallel.Strategies.Lens Control.Seq.Lens Data.Array.Lens
                 Data.Bits.Lens Data.ByteString.Lens Data.ByteString.Strict.Lens
                 Data.ByteString.Lazy.Lens Data.Complex.Lens Data.Data.Lens
                 Data.Dynamic.Lens Data.HashSet.Lens Data.IntSet.Lens Data.List.Lens
                 Data.List.Split.Lens Data.Sequence.Lens Data.Set.Lens
                 Data.Text.Lens Data.Text.Strict.Lens Data.Text.Lazy.Lens
                 Data.Tree.Lens Data.Typeable.Lens Data.Vector.Lens
                 Data.Vector.Generic.Lens System.Exit.Lens System.FilePath.Lens
                 Numeric.Lens
hidden-modules:
trusted: False
import-dirs: /usr/lib/haskell-packages/ghc/lib/lens-3.10/ghc-7.6.3
library-dirs: /usr/lib/haskell-packages/ghc/lib/lens-3.10/ghc-7.6.3
hs-libraries: HSlens-3.10
extra-libraries:
extra-ghci-libraries:
include-dirs:
includes:
depends: MonadCatchIO-transformers-0.3.0.0-00f5ba39422294066c7f13d4ef6c89a7
         array-0.4.0.1-3b78425c10ff2dad7acf7e8c8ae014c3
         base-4.6.0.1-8aa5d403c45ea59dcd2c39f123e27d57
         bifunctors-4.1.0.1-5266d936dda24bb03c9f4cd6707beed1
         bytestring-0.10.0.2-4f93248f75667c2c3321a7a6761b576f
         comonad-4.0-1df0ce7fc9946a997e390d7efe2f8c5d
         containers-0.5.0.0-ab1dae9a94cd3cc84e7b2805636ebfa2
         contravariant-0.4.4-0f529cf89c5b4106ca6f0ff9d44b661d
         distributive-0.3-9a9b53d31442b0f19f1b2e42e578db7b
         filepath-1.3.0.1-b12cbe18566fe1532a1fda4c85e31cbe
         generic-deriving-1.4.0-c4dc04b650864f47d38c7f765bfd1a5e
         ghc-prim-0.3.0.0-d5221a8c8a269b66ab9a07bdc23317dd
         hashable-1.2.1.0-7e83190fbb1b0ba81d7022fa876f0f8b
         mtl-2.1.2-94c72af955e94b8d7b2f359dadd0cb62
         parallel-3.2.0.3-d6c020cb3aa15c71f5f29c0db359fd39
         profunctors-4.0.1-dc131e72ac3b3398997ff33929ca8456
         reflection-1.2.0.1-3eea1741aff8138ef7446de9e4196a72
         semigroupoids-4.0-2f73b390ed2b359c194de4094319ba4e
         semigroups-0.9-73a419ce05af9d7589969e187fb66622
         split-0.2.2-9ce33138f4fcfb9c37f6e6c300bcc367
         tagged-0.7-d243d7f9110b53b4d18740d6abd0cfb9
         template-haskell-2.8.0.0-a3012803fde1dc362e555b35a1a78e6d
         text-0.11.3.1-e38859e86485c167fa7c9441789e7607
         transformers-0.3.0.0-ff2bb6ac67241ebb987351a3db564af0
         unordered-containers-0.2.3.0-9584b653deee0b5f16062e26c5ddf569
         vector-0.10.0.1-1fbb548bc492f07fef7e604d2e6f581d
         void-0.6.1-621dc8316fc80dae8fc701f1a2411b4b
hugs-options:
cc-options:
ld-options:
framework-dirs:
frameworks:
haddock-interfaces: /usr/lib/ghc-doc/haddock/lens-3.10/lens.haddock
haddock-html: /usr/share/doc/libghc-lens-doc/html/