Fixity parser: don't require trailing newline

CHANGELOG.md

@@ -1,7 +1,10 @@
 ## Unreleased
 
 * Fix Haddock comments on infix constructors
-  [Issue 758](https://github.com/tweag/ormolu/issues/758)
+  [Issue 758](https://github.com/tweag/ormolu/issues/758).
+
+* Don't require a trailing newline in `.ormolu` files. [Issue
+  1122](https://github.com/tweag/ormolu/issues/1122).
 
 ## Ormolu 0.7.5.0
 

src/Ormolu/Fixity/Parser.hs

@@ -90,14 +90,10 @@ pDotOrmolu =
     (FixityOverrides . Map.fromList . mconcat)
     (ModuleReexports . Map.map NE.sort . Map.fromListWith (<>))
     . partitionEithers
-    <$> many configLine
+    <$> (configLine `sepEndBy` (void eol *> hidden space))
     <* eof
   where
-    configLine = do
-      x <- eitherP pFixity pModuleReexport
-      void eol
-      hidden space
-      return x
+    configLine = eitherP pFixity pModuleReexport
 
 -- | Parse a single fixity declaration, such as
 --

tests/Ormolu/Fixity/ParserSpec.hs

@@ -60,6 +60,13 @@ spec = do
           [ "infixr 9  .",
             "infixr 5  ++"
           ]
+    it "parses inputs without a trailing newline" $
+      parseDotOrmolu ""
+        `shouldSucceedOn` T.intercalate
+          "\n"
+          [ "infixr 9  .",
+            "infixr 5  ++"
+          ]
     it "fails with correct parse error (keyword wrong second line)" $
       parseDotOrmolu "" "infixr 5 .\nfoobar 5 $"
         `shouldFailWith` err