Remove lens dependency (was not used)

brittany.cabal

@@ -80,7 +80,6 @@ library {
     , pretty >=1.1.3.3 && <1.2
     , bytestring >=0.10.8.1 && <0.11
     , directory >=1.2.6.2 && <1.4
-    , lens
     , butcher >=1.0.0.0 && <1.1
     , yaml >=0.8.18 && <0.9
     , aeson >=1.0.1.0 && <1.3
@@ -141,7 +140,6 @@ executable brittany
     , pretty
     , bytestring
     , directory
-    , lens
     , butcher
     , yaml
     , extra
@@ -209,7 +207,6 @@ test-suite unittests
     , pretty
     , bytestring
     , directory
-    , lens
     , butcher
     , yaml
     , extra
@@ -277,7 +274,6 @@ test-suite littests
     , pretty
     , bytestring
     , directory
-    , lens
     , butcher
     , yaml
     , extra

docs/implementation/dataflow.md

@@ -9,7 +9,7 @@ Brittany makes heavy usage of mtl-on-steroids-style transformers, mostly
 limited to Reader, Writer and State. For this kind of task it makes a lot of
 sense; we do a pure transformation involving multiple steps
 that each requires certain local state during traversals of recursive data
-structures. By using MultiRWS we can avoid using lens for the most part without
+structures. By using MultiRWS we can even entirely avoid using lens without
 inducing too much boilerplate.
 
 Firstly, the topmost layer, the IO bits:

src/Language/Haskell/Brittany/Config/Types.hs

@@ -14,7 +14,6 @@ where
 import Data.Yaml
 import qualified Data.Aeson.Types as Aeson
 import GHC.Generics
-import Control.Lens
 
 import Data.Data ( Data )
 
@@ -395,6 +394,3 @@ instance CZip ConfigF where
 cMap :: CZip k => (forall a . f a -> g a) -> k f -> k g
 cMap f c = cZip (\_ -> f) c c
 
-makeLenses ''DebugConfigF
-makeLenses ''ConfigF
-makeLenses ''LayoutConfigF

src/Language/Haskell/Brittany/Utils.hs

@@ -2,9 +2,7 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Language.Haskell.Brittany.Utils
-  ( (.=+)
-  , (%=+)
-  , parDoc
+  ( parDoc
   , fromMaybeIdentity
   , fromOptionIdentity
   , traceIfDumpConf
@@ -55,20 +53,10 @@ import           DataTreePrint
 import           Language.Haskell.Brittany.Config.Types
 import           Language.Haskell.Brittany.Types
 
-import qualified Control.Lens as Lens
-
 import qualified Data.Generics.Uniplate.Direct as Uniplate
 
 
 
-(.=+) :: MonadMultiState s m
-      => Lens.ASetter s s a b -> b -> m ()
-l .=+ b = mModify $ l Lens..~ b
-
-(%=+) :: MonadMultiState s m
-      => Lens.ASetter s s a b -> (a -> b) -> m ()
-l %=+ f = mModify (l Lens.%~ f)
-
 parDoc :: String -> PP.Doc
 parDoc = PP.fsep . fmap PP.text . List.words
 

srcinc/prelude.inc

@@ -42,7 +42,7 @@ import qualified System.Process.Extra
 import qualified System.Time.Extra
 
 -- import qualified Control.Exception.Lens
-import qualified Control.Lens
+-- import qualified Control.Lens
 -- import qualified Control.Lens.At
 -- import qualified Control.Lens.Combinators
 -- import qualified Control.Lens.Cons