libghc-lens-dev 4.1.2.1-3+b1 / var / lib / ghc / package.conf.d / lens-4.1.2.1.conf

name: lens
version: 4.1.2.1
id: lens-4.1.2.1-a12a4355060225999f5a3d355de0ee04

license: BSD3
copyright: Copyright (C) 2012-2014 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 <https://github.com/ekmett/lens#lens-lenses-folds-and-traversals README>.
             .
             An introductory video on the style of code used in this library by Simon Peyton Jones is available from <http://skillsmatter.com/podcast/scala/lenses-compositional-data-access-and-manipulation Skills Matter>.
             .
             A video on how to use lenses and how they are constructed is available on <http://youtu.be/cefnmjtAolY?hd=1 youtube>.
             .
             Slides for that second talk can be obtained from <http://comonad.com/haskell/Lenses-Folds-and-Traversals-NYC.pdf comonad.com>.
             .
             More information on the care and feeding of lenses, including a brief tutorial and motivation
             for their types can be found on the <https://github.com/ekmett/lens/wiki lens wiki>.
             .
             A small game of @pong@ and other more complex examples that manage their state using lenses can be found in the <https://github.com/ekmett/lens/blob/master/examples/ example folder>.
             .
             /Lenses, Folds and Traversals/
             .
             With some signatures simplified, the core of the hierarchy of lens-like constructions looks like:
             .
             .
             <<http://i.imgur.com/4fHw3Fd.png>>
             .
             <Hierarchy.png (Local Copy)>
             .
             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)
             .
             > -- quux :: 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, Generics
author: Edward A. Kmett
exposed: True
exposed-modules: Control.Lens.TH Control.Lens.Internal.TH
                 Codec.Compression.Zlib.Lens Control.Exception.Lens Control.Lens
                 Control.Lens.Action Control.Lens.At Control.Lens.Combinators
                 Control.Lens.Cons Control.Lens.Each Control.Lens.Empty
                 Control.Lens.Equality Control.Lens.Extras 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.Reflection Control.Lens.Internal.Review
                 Control.Lens.Internal.Setter 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.Traversal Control.Lens.Tuple
                 Control.Lens.Type Control.Lens.Wrapped Control.Lens.Zoom
                 Control.Monad.Error.Lens Control.Monad.Primitive.Lens
                 Control.Parallel.Strategies.Lens Control.Seq.Lens Data.Aeson.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.Map.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 Generics.Deriving.Lens GHC.Generics.Lens
                 System.Exit.Lens System.FilePath.Lens System.IO.Error.Lens
                 Language.Haskell.TH.Lens Numeric.Lens
hidden-modules: Control.Lens.Internal.TupleIxedTH
trusted: False
import-dirs: /usr/lib/haskell-packages/ghc/lib/lens-4.1.2.1/ghc-7.6.3
library-dirs: /usr/lib/haskell-packages/ghc/lib/lens-4.1.2.1/ghc-7.6.3
hs-libraries: HSlens-4.1.2.1
extra-libraries:
extra-ghci-libraries:
include-dirs:
includes:
depends: aeson-0.7.0.3-b2104430b98076204addb28d44d77c72
         array-0.4.0.1-3b78425c10ff2dad7acf7e8c8ae014c3
         base-4.6.0.1-8aa5d403c45ea59dcd2c39f123e27d57
         bifunctors-4.1.1.1-e470086773829e60668176b14608e58c
         bytestring-0.10.0.2-4f93248f75667c2c3321a7a6761b576f
         comonad-4.2-4a02317d18bbfeb3af182f52901c36ba
         containers-0.5.0.0-ab1dae9a94cd3cc84e7b2805636ebfa2
         contravariant-0.6.1.1-dc0307441fd819ad7a9c61ca4025e014
         distributive-0.4.4-38a4109eb44677a35895368590924e05
         exceptions-0.6.1-8e5077c2798c04f83b07b29e8f8aa7dc
         filepath-1.3.0.1-b12cbe18566fe1532a1fda4c85e31cbe
         free-4.9-ed2885875be033417c7706294a0792bb
         ghc-prim-0.3.0.0-d5221a8c8a269b66ab9a07bdc23317dd
         hashable-1.2.1.0-7e83190fbb1b0ba81d7022fa876f0f8b
         mtl-2.1.2-94c72af955e94b8d7b2f359dadd0cb62
         parallel-3.2.0.4-6b28f3e9db87f9045e4a465cbf1af2ba
         primitive-0.5.0.1-8e5f40b409f7bb31ae1acfb125279700
         profunctors-4.0.4-a8022752546885006bda49090e2066ab
         reflection-1.2.0.1-6ae34e61ff3380f3d901cc9372625051
         scientific-0.2.0.2-3e3f1a2572e19a152f55928cb449a437
         semigroupoids-4.2-8d6d86a1437695e1bbe2ef5d2e8cff4f
         semigroups-0.15.3-f01224638d8ef67a79d1815551975c8a
         split-0.2.2-9ce33138f4fcfb9c37f6e6c300bcc367
         tagged-0.7.2-002e2b0a3122c5b5f8b9c8717b5e6b17
         template-haskell-2.8.0.0-a3012803fde1dc362e555b35a1a78e6d
         text-0.11.3.1-e38859e86485c167fa7c9441789e7607
         transformers-0.3.0.0-ff2bb6ac67241ebb987351a3db564af0
         unordered-containers-0.2.5.0-11c50452e1ec4de862c3ca415f189512
         utf8-string-0.3.7-26a8ed8ca48fe809983bde6faca943a9
         vector-0.10.0.1-1fbb548bc492f07fef7e604d2e6f581d
         void-0.6.1-6ab28aebe7d5f0e431c272c57fa7c4cf
         zlib-0.5.4.1-13ba81ac0d7e6f3bdf1ee5ddce4e9aab
hugs-options:
cc-options:
ld-options:
framework-dirs:
frameworks:
haddock-interfaces: /usr/lib/ghc-doc/haddock/lens-4.1.2.1/lens.haddock
haddock-html: /usr/share/doc/libghc-lens-doc/html/