compiler: trivial code simplifications

Following HLint's advice.

1 files changed, 6 insertions, 5 deletions

diff --git a/compiler/app/Main.hs b/compiler/app/Main.hs
index 061fab7..e71e0db 100644
--- a/compiler/app/Main.hs
+++ b/compiler/app/Main.hs
@@ -21,6 +21,7 @@ module Main where
 import GHC.Generics (Generic)
 import Paths_ldgallery_compiler (version, getDataFileName)
 import Control.Monad (when)
+import Data.Functor ((<&>))
 import Data.Maybe (isJust)
 import Data.Version (showVersion)
 import Data.Aeson (ToJSON)
@@ -32,7 +33,7 @@ import Compiler
 import Files (readDirectory, copyTo, remove)
 
 
-data ViewerConfig = ViewerConfig
+newtype ViewerConfig = ViewerConfig
   { galleryRoot :: String
   } deriving (Generic, Show, ToJSON)
 
@@ -92,7 +93,7 @@ options = Options
       &= help "Deploy either the bundled or the given static web viewer to the output directory"
   }
 
-  &= summary ("ldgallery v" ++ (showVersion version) ++ " - a static web gallery generator with tags")
+  &= summary ("ldgallery v" ++ showVersion version ++ " - a static web gallery generator with tags")
   &= program "ldgallery"
   &= help "Compile a gallery"
   &= helpArg [explicit, name "h", name "help"]
@@ -146,7 +147,7 @@ main =
 
     deployViewer :: FilePath -> Options -> IO ()
     deployViewer distPath Options{outputDir, cleanOutput} =
-      (when cleanOutput $ cleanViewerDir outputDir)
+      when cleanOutput (cleanViewerDir outputDir)
       >> copyViewer distPath outputDir
       >> writeJSON (outputDir </> "config.json") viewerConfig
 
@@ -154,8 +155,8 @@ main =
         cleanViewerDir :: FilePath -> IO ()
         cleanViewerDir target =
           listDirectory target
-          >>= return . filter (/= gallerySubdir)
-          >>= mapM_ remove . map (target </>)
+          <&> filter (/= gallerySubdir)
+          >>= mapM_ (remove . (target </>))
 
         copyViewer :: FilePath -> FilePath -> IO ()
         copyViewer dist target =