Minor refactoring

src/Language/Haskell/Brittany/Internal/Backend.hs

@@ -156,7 +156,9 @@ layoutBriDocM = \case
   BDAnnotationPrior annKey bd -> do
     state <- mGet
     let m = _lstate_comments state
-    let allowMTEL = Data.Either.isRight (_lstate_curYOrAddNewline state)
+    let moveToExactLocationAction = case _lstate_curYOrAddNewline state of
+          Left{} -> pure ()
+          Right{} -> moveToExactAnn annKey
     mAnn <- do
       let mAnn = ExactPrint.annPriorComments <$> Map.lookup annKey m
       mSet $ state
@@ -167,8 +169,8 @@ layoutBriDocM = \case
         }
       return mAnn
     case mAnn of
-      Nothing     -> when allowMTEL $ moveToExactAnn annKey
-      Just []     -> when allowMTEL $ moveToExactAnn annKey
+      Nothing     -> moveToExactLocationAction
+      Just []     -> moveToExactLocationAction
       Just priors -> do
         -- layoutResetSepSpace
         priors
@@ -184,7 +186,7 @@ layoutBriDocM = \case
                       -- layoutMoveToIndentCol y
                       layoutWriteAppendMultiline commentLines
           -- mModify $ \s -> s { _lstate_curYOrAddNewline = Right 0 }
-        when allowMTEL $ moveToExactAnn annKey
+        moveToExactLocationAction
     layoutBriDocM bd
   BDAnnotationKW annKey keyword bd -> do
     layoutBriDocM bd

src/Language/Haskell/Brittany/Internal/BackendUtils.hs

@@ -28,6 +28,7 @@ module Language.Haskell.Brittany.Internal.BackendUtils
   , layoutMoveToCommentPos
   , layoutIndentRestorePostComment
   , moveToExactAnn
+  , moveToY
   , ppmMoveToExactLoc
   , layoutWritePriorComments
   , layoutWritePostComments
@@ -469,7 +470,10 @@ moveToExactAnn annKey = do
       -- curY <- mGet <&> _lstate_curY
       let ExactPrint.DP (y, _x) = ExactPrint.annEntryDelta ann
       -- mModify $ \state -> state { _lstate_addNewline = Just x }
-      mModify $ \state ->
+      moveToY y
+
+moveToY :: MonadMultiState LayoutState m => Int -> m ()
+moveToY y = mModify $ \state ->
   let upd = case _lstate_curYOrAddNewline state of
         Left  i -> if y == 0 then Left i else Right y
         Right i -> Right $ max y i

src/Language/Haskell/Brittany/Internal/LayouterBasics.hs

@@ -73,6 +73,8 @@ module Language.Haskell.Brittany.Internal.LayouterBasics
   , hasAnyRegularCommentsRest
   , hasAnnKeywordComment
   , hasAnnKeyword
+  , astAnn
+  , allocNodeIndex
   )
 where
 
@@ -575,7 +577,8 @@ docSeparator = allocateNode BDFSeparator
 
 docAnnotationPrior
   :: AnnKey -> ToBriDocM BriDocNumbered -> ToBriDocM BriDocNumbered
-docAnnotationPrior annKey bdm = allocateNode . BDFAnnotationPrior annKey =<< bdm
+docAnnotationPrior annKey bdm =
+  allocateNode . BDFAnnotationPrior annKey =<< bdm
 
 docAnnotationKW
   :: AnnKey