Retain ANSI "show cursor"-sequence when parsing summary

This fixes a bug introduced in 559eaf6

src/Session.hs

@@ -20,7 +20,9 @@ module Session (
 , hasSpec
 , hasHspecCommandSignature
 , hspecCommand
+, Extract(..)
 , extractSummary
+, ansiShowCursor
 #endif
 ) where
 
@@ -123,16 +125,21 @@ isSuccess = not . isFailure
 extractSummary :: Extract Summary
 extractSummary = Extract {
   isPartialMessage = partialMessageStartsWithOneOf [summaryPrefix, ansiShowCursor <> summaryPrefix]
-, parseMessage = fmap (flip (,) "") . parseSummary
+, parseMessage
 } where
     summaryPrefix :: ByteString
     summaryPrefix = "Summary {"
 
+    parseMessage :: ByteString -> Maybe (Summary, ByteString)
+    parseMessage input = case ByteString.stripPrefix ansiShowCursor input of
+      Nothing -> flip (,) "" <$> parseSummary input
+      Just i -> flip (,) ansiShowCursor <$> parseSummary i
+
     parseSummary :: ByteString -> Maybe Summary
     parseSummary = readMaybe . decodeUtf8 . stripAnsiShowCursor
 
-    ansiShowCursor :: ByteString
-    ansiShowCursor = "\ESC[?25h"
-
     stripAnsiShowCursor :: ByteString -> ByteString
     stripAnsiShowCursor input = fromMaybe input $ ByteString.stripPrefix ansiShowCursor input
+
+ansiShowCursor :: ByteString
+ansiShowCursor = "\ESC[?25h"

test/SessionSpec.hs

@@ -88,3 +88,18 @@ spec = do
       withSession [name, "--no-color", "-m", "foo"] $ \session -> do
         _ <- runSpec session >> runSpec session
         hspecPreviousSummary session `shouldReturn` Just (Summary 1 0)
+
+  describe "extractSummary" $ do
+    let
+      summary :: Summary
+      summary = Summary 0 0
+
+      input :: ByteString
+      input = fromString $ show summary
+
+    it "extracts summary" $ do
+      extractSummary.parseMessage input `shouldBe` Just (summary, "")
+
+    context "when the input starts with the ANSI \"show cursor\"-sequence" $ do
+      it "extracts summary" $ do
+        extractSummary.parseMessage (ansiShowCursor <> input) `shouldBe` Just (summary, ansiShowCursor)