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michaelt 2015-06-02 10:39:10 -04:00
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Lens/Simple.hs
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@ -67,11 +67,8 @@ module Lens.Simple (
, AlongsideLeft, AlongsideRight
, Zooming
-- * Re-exports
, Applicative, Foldable, Monoid(..),(<>)
, Backwards, All, Any, First, Last, Sum, Product
, StateT, Writer
, Monoid(..),(<>)
) where
import Lens.Family2.Unchecked
import Lens.Family2.Stock

42
lens-simple.cabal
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@ -1,32 +1,44 @@
name: lens-simple
version: 0.1.0.0
version: 0.1.0.2
synopsis: simplified import of elementary lens-family combinators
description: This module, @Lens.Simple@, just re-exports the main modules from Russell O\'Connor's
<http://hackage.haskell.org/package/lens-family-core lens-family-core>
description: This module, <http://hackage.haskell.org/package/lens-simple/docs/Lens-Simple.html Lens.Simple>, just re-exports the main modules from Russell O\'Connor's
<http://hackage.haskell.org/package/lens-family lens-family>
package, the original <http://r6.ca/blog/20120623T104901Z.html van Laarhoven lens> library.
@Lens.Simple@ also re-exports @makeLenses@ and
other TH incantations from Dan Burton's associated
<http://hackage.haskell.org/package/lens-family-th lens-family-th>.
.
The idea is just to make a lens-family equivalent of @import Control.Lens@, namely @import Lens.Simple@
/-/- it's even one character shorter! As an illustration, note that
the <https://github.com/michaelt/lens-family-simple/blob/master/examples/Pong.hs pong example>
The idea is just to make a sort of low-power, minimal-dependency @lens-family@ equivalent of
.
> import Control.Lens
.
namely:
.
> import Lens.Simple
.
Check it out, it's even one character shorter!
.
As an illustration, note that the
<https://github.com/michaelt/lens-family-simple/blob/master/examples/Pong.hs pong example>
from the @lens@ library requires only this abbreviating change of imports.
If you care to make that program more complicated, you might at some point need
the unfathomably more sophisticated material in @Control.Lens@.
Because @lens-family@ accords as
far as possible, with @Control.Lens@, within its more limited sphere,
a change of imports will often be all that is necessary to begin using them.
.
Similarly, when need arises for the unfathomably more
sophisticated material in @Control.Lens@, a
change of imports will often be all that is necessary
to begin using them.
It is rarely necessary to exceed the materials exported here when using
the lenses and quasi-lenses exported by e.g.
<http://hackage.haskell.org/package/pipes-bytestring pipes-bytestring>
or <http://hackage.haskell.org/package/pipes-group pipes-group>. It is for such
use-cases that this module is principally intended.
.
It should be kept in mind that the @zoom@ exported here does
not use @MonadState@ from @mtl@ but is
specialized to @Control.Monad.Trans.State.Strict@ Many of
the other lenses and combinators are a bit more
Note that many of the other lenses and combinators are a bit more
specialized than their @Control.Lens@ equivalents:
for example, _1 and _2 are here
familiarly specialized to act just on real Haskell
pairs; with the loss of abstraction we also of course
pairs. With the loss of abstraction we also of course
lose the concomitant opaque error messages
about @Field1 s t a b@ etc.