Add filterWithKey and bump classyprelude cabal version

.gitignore

@@ -5,3 +5,4 @@ cabal.sandbox.config
 .stack-work/
 tarballs/
 *~
+dist-newstyle/

mono-traversable/ChangeLog.md

@@ -1,5 +1,10 @@
 # ChangeLog for mono-traversable
 
+## 1.0.19.0
+
+* Added `filterWithKey` to `IsMap`.
+  [#232](https://github.com/snoyberg/mono-traversable/pull/232)
+
 ## 1.0.18.0
 
 * Added MonoPointed instance for text Builder

mono-traversable/mono-traversable.cabal

@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack
 
 name:           mono-traversable
-version:        1.0.18.0
+version:        1.0.19.0
 synopsis:       Type classes for mapping, folding, and traversing monomorphic containers
 description:    Please see the README at <https://www.stackage.org/package/mono-traversable>
 category:       Data

mono-traversable/package.yaml

@@ -1,5 +1,5 @@
 name:        mono-traversable
-version:     1.0.18.0
+version:     1.0.19.0
 synopsis:    Type classes for mapping, folding, and traversing monomorphic containers
 description: Please see the README at <https://www.stackage.org/package/mono-traversable>
 category:    Data

mono-traversable/src/Data/Containers.hs

@@ -548,8 +548,15 @@ class (MonoTraversable map, SetContainer map) => IsMap map where
     -- | Filter values in a map.
     --
     -- @since 1.0.9.0
-    filterMap :: IsMap map => (MapValue map -> Bool) -> map -> map
-    filterMap p = mapFromList . filter (p . snd) . mapToList
+    filterMap :: (MapValue map -> Bool) -> map -> map
+    filterMap = filterWithKey . const
+
+    -- | Equivalent to 'filterMap', but the function accepts the key,
+    -- as well as the value.
+    --
+    -- @since 1.0.19.0
+    filterWithKey :: (ContainerKey map -> MapValue map -> Bool) -> map -> map
+    filterWithKey p = mapFromList . filter (uncurry p) . mapToList
 
 -- | This instance uses the functions from "Data.Map.Strict".
 instance Ord key => IsMap (Map.Map key value) where
@@ -599,6 +606,8 @@ instance Ord key => IsMap (Map.Map key value) where
     {-# INLINE omapKeysWith #-}
     filterMap = Map.filter
     {-# INLINE filterMap #-}
+    filterWithKey = Map.filterWithKey
+    {-# INLINE filterWithKey #-}
 
 -- | This instance uses the functions from "Data.HashMap.Strict".
 instance (Eq key, Hashable key) => IsMap (HashMap.HashMap key value) where
@@ -636,6 +645,8 @@ instance (Eq key, Hashable key) => IsMap (HashMap.HashMap key value) where
     --mapKeysWith = HashMap.mapKeysWith
     filterMap = HashMap.filter
     {-# INLINE filterMap #-}
+    filterWithKey = HashMap.filterWithKey
+    {-# INLINE filterWithKey #-}
 
 -- | This instance uses the functions from "Data.IntMap.Strict".
 instance IsMap (IntMap.IntMap value) where
@@ -684,6 +695,8 @@ instance IsMap (IntMap.IntMap value) where
     {-# INLINE omapKeysWith #-}
     filterMap = IntMap.filter
     {-# INLINE filterMap #-}
+    filterWithKey = IntMap.filterWithKey
+    {-# INLINE filterWithKey #-}
 
 instance Eq key => IsMap [(key, value)] where
     type MapValue [(key, value)] = value