Support extra space in clingo 3

pingo.cabal

@@ -14,14 +14,14 @@ cabal-version:       >=1.10
 library
   exposed-modules: Pingo.AST
   build-depends:
-    base >=4.9 && <4.10
+    base >=4.8 && <4.10
   hs-source-dirs:      src
   default-language:    Haskell2010
 
 executable pingo
   main-is:             Main.hs
   build-depends:
-    base >=4.9 && <4.10,
+    base >=4.8 && <4.10,
     parsec >= 3.1 && < 3.2,
     parsec3-numbers == 0.1.0,
     ansi-terminal >= 0.7 && <1.0,

src/Pingo/Parser.hs

@@ -54,7 +54,7 @@ atom = do
 answerSet :: Parser AnswerSet
 answerSet = do
   string "Answer: " *> many1 digit <* newline
-  (atom <?> "a predicate or atom") `sepBy` char ' '
+  (atom <?> "a predicate or atom") `sepEndBy` char ' '
 
 -- | The 'answerSets' parser collects a list of 'AnswerSet's
 answerSets :: Parser [AnswerSet]
@@ -63,8 +63,8 @@ answerSets = (answerSet <?> "an answer set") `endBy` newline
 -- | This 'file' parser removes metadata printed by clingo
 -- and returns the inner 'AnswerSet's
 file :: Parser [AnswerSet]
-file = try (anyTill (string "Answer: "))  *> answerSets
-  <|> manyTill anyChar (lookAhead $ try (string "UNSATISFIABLE")) *> fail "No Answer Sets found"
+file = try (anyTill (string "Answer: ")) *> answerSets
+  <|> anyTill (string "UNSATISFIABLE") *> fail "No Answer Sets found"
 
 -- | The 'parse' function takes 'String' input
 -- and returns the 'AnswerSet's or a 'ParseError'