Simple lenses, minimum dependencies
License: Other
I am currently serving in the National Guard of Ukraine and am not able to perform my maintainer duties.
Please see https://ro-che.info/articles/2014-02-08-my-haskell-will.
It would be nice to switch more easily from the lens package to your lightweight version.
For instance, you could add aliases to define the most basic lens applications, such as over, set, use.
Currently, if I want to switch, I have to create my own compatibility module.
For instance, here is a wrapper I needed for a small project:
module Lens
( module Data.Lens.Light
, module Lens
) where
import Data.Lens.Light
over = modL
set = setL
use = access
_2 = lens snd $ \ y (x, _) -> (x, y)> /tmp/stackage-build8$ stack unpack data-lens-light-0.1.2.1
Unpacked data-lens-light-0.1.2.1 to /tmp/stackage-build8/data-lens-light-0.1.2.1/
> /tmp/stackage-build8/data-lens-light-0.1.2.1$ runghc -clear-package-db -global-package-db -package-db=/home/stackage/work/builds/nightly/pkgdb Setup configure --package-db=clear --package-db=global --package-db=/home/stackage/work/builds/nightly/pkgdb --libdir=/home/stackage/work/builds/nightly/lib --bindir=/home/stackage/work/builds/nightly/bin --datadir=/home/stackage/work/builds/nightly/share --libexecdir=/home/stackage/work/builds/nightly/libexec --sysconfdir=/home/stackage/work/builds/nightly/etc --docdir=/home/stackage/work/builds/nightly/doc/data-lens-light-0.1.2.1 --htmldir=/home/stackage/work/builds/nightly/doc/data-lens-light-0.1.2.1 --haddockdir=/home/stackage/work/builds/nightly/doc/data-lens-light-0.1.2.1 --flags=
Configuring data-lens-light-0.1.2.1...
> /tmp/stackage-build8/data-lens-light-0.1.2.1$ runghc -clear-package-db -global-package-db -package-db=/home/stackage/work/builds/nightly/pkgdb Setup build
Building data-lens-light-0.1.2.1...
Preprocessing library data-lens-light-0.1.2.1...
[1 of 4] Compiling Data.Lens.Light.Core ( src/Data/Lens/Light/Core.hs, dist/build/Data/Lens/Light/Core.o )
[2 of 4] Compiling Data.Lens.Light.Template ( src/Data/Lens/Light/Template.hs, dist/build/Data/Lens/Light/Template.o )
src/Data/Lens/Light/Template.hs:87:18: error:
• The constructor ‘DataD’ should have 6 arguments, but has been given 5
• In the pattern: DataD _ _ params cons' _
In a case alternative:
DataD _ _ params cons' _ -> return (params, cons')
In a stmt of a 'do' block:
(params, cons) <- case dec of {
DataD _ _ params cons' _ -> return (params, cons')
NewtypeD _ _ params con' _ -> return (params, [con'])
_ -> fail $ errmsg t }
And no upper bound ;)
[3 of 4] Compiling Data.Lens.Light.State ( src/Data/Lens/Light/State.hs, dist/dist-sandbox-8f6b8747/build/Data/Lens/Light/State.o )
src/Data/Lens/Light/State.hs:24:10:
Ambiguous occurrence modify'
It could refer to either Data.Lens.Light.State.modify',
defined at src/Data/Lens/Light/State.hs:40:1
or Control.Monad.State.modify',
imported from `Control.Monad.State' at src/Data/Lens/Light/State.hs:10:1-26
(and originally defined in `Control.Monad.State.Class')
src/Data/Lens/Light/State.hs:35:11:
Ambiguous occurrence modify'
It could refer to either Data.Lens.Light.State.modify',
defined at src/Data/Lens/Light/State.hs:40:1
or Control.Monad.State.modify',
imported from `Control.Monad.State' at src/Data/Lens/Light/State.hs:10:1-26
(and originally defined in `Control.Monad.State.Class')
src/Data/Lens/Light/Template.hs:102:22: error: [GHC-83865]
• Couldn't match type ‘BndrVis’ with ‘()’
Expected: [TyVarBndr']
Actual: [TyVarBndr BndrVis]
• In the first argument of ‘makeAccs’, namely ‘params’
In the first argument of ‘(.)’, namely ‘makeAccs params’
In the first argument of ‘($)’, namely ‘makeAccs params . nub’
|
102 | decs <- makeAccs params . nub $ concatMap namedFields cons
| ^^^^^^
I make a hackage revision to place bound template-haskell < 2.21: https://hackage.haskell.org/package/data-lens-light-0.1.2.3/revisions/
Was there a reason for setting the composition order of lenses to 'right to left' rather than 'left to right' as used in the lens package? I don't particularly mind expect for when I feel like switching to and from the lens package.
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