diff options
Diffstat (limited to 'lib/Language/Haskell/Stylish/Step/Imports.hs')
-rw-r--r-- | lib/Language/Haskell/Stylish/Step/Imports.hs | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Language/Haskell/Stylish/Step/Imports.hs b/lib/Language/Haskell/Stylish/Step/Imports.hs index 927719c..fc035a2 100644 --- a/lib/Language/Haskell/Stylish/Step/Imports.hs +++ b/lib/Language/Haskell/Stylish/Step/Imports.hs @@ -22,9 +22,9 @@ import Data.Char (toLower) import Data.List (intercalate, sortBy) import qualified Data.Map as M import Data.Maybe (isJust, maybeToList) -import Data.Monoid ((<>)) import Data.Ord (comparing) import qualified Data.Set as S +import Data.Semigroup (Semigroup ((<>))) import qualified Language.Haskell.Exts as H @@ -168,10 +168,13 @@ data ImportPortion l = ImportSome [H.CName l] -- ^ @A(x, y, z)@ | ImportAll -- ^ @A(..)@ +instance Ord l => Semigroup (ImportPortion l) where + ImportSome a <> ImportSome b = ImportSome (setUnion a b) + _ <> _ = ImportAll + instance Ord l => Monoid (ImportPortion l) where mempty = ImportSome [] - mappend (ImportSome a) (ImportSome b) = ImportSome (setUnion a b) - mappend _ _ = ImportAll + mappend = (<>) -- | O(n log n) union. setUnion :: Ord a => [a] -> [a] -> [a] |