Fix NixOS#188

Fixes NixOS#188
piegamesde · Apr 15, 2024 · e234c2b · e234c2b
1 parent 35b0186
commit e234c2b
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/Nixfmt/Pretty.hs b/src/Nixfmt/Pretty.hs
@@ -18,6 +18,7 @@ import Nixfmt.Types
   ParamAttr(..), Parameter(..), Selector(..), SimpleSelector(..),
   StringPart(..), Term(..), Token(..), TrailingComment(..), Trivium(..),
   Whole(..), tokenText, mapFirstToken, mapFirstToken', mapLastToken', hasTrivia)
+-- import Debug.Trace (traceShowId)
 
 toLineComment :: TrailingComment -> Trivium
 toLineComment (TrailingComment c) = LineComment $ " " <> c
@@ -60,6 +61,8 @@ prettyItems sep items = prettyItems' $ unItems items
     prettyItems' :: Pretty a => [Item a] -> Doc
     prettyItems' [] = mempty
     prettyItems' [item] = pretty item
+    -- Fix for https://github.com/NixOS/nixfmt/issues/188
+    prettyItems' [item, DetachedComments []] = pretty item
     prettyItems' (item : xs)
         = pretty item
         <> case item of { CommentedItem _ _ -> sep; DetachedComments _ -> emptyline }