Fix incorrect count report

For small counts, this reported wrong number of documents (batch size
instead of the small count).

src/HAL.hs

@@ -30,18 +30,18 @@ getMetadataWithC :: Text -> Maybe Int -> Maybe Integer -> IO (Either ClientError
 getMetadataWithC q start rows = do
   manager' <- newManager tlsManagerSettings
   -- First, estimate the total number of documents
-  eRes <- runHalAPIClient $ search (Just requestedFields) [q] Nothing (Just 0) (Just 1)
-  pure $ get' q start rows <$> eRes
+  eCount <- countResults q
+  pure $ get' q start rows <$> eCount
   where
-    get' :: Text -> Maybe Int -> Maybe Integer -> Response Corpus -> (Maybe Integer, ConduitT () Corpus IO ())
-    get' q start rows (Response { _numFound }) =
+    get' :: Text -> Maybe Int -> Maybe Integer -> Integer -> (Maybe Integer, ConduitT () Corpus IO ())
+    get' q start rows numFound =
       ( Just numResults
       , yieldMany [0..]
         .| takeC (fromInteger numPages)
         .| concatMapMC (getPage q start'))
       where
         start' = fromMaybe 0 start
-        rows' = fromMaybe _numFound rows
+        rows' = min numFound $ fromMaybe numFound rows
         numResults = rows' - (fromIntegral start')
         numPages = numResults `div` (fromIntegral batchSize) + 1
       
@@ -61,11 +61,8 @@ countResults :: Text -> IO (Either ClientError Integer)
 countResults q = do
   manager' <- newManager tlsManagerSettings
   -- First, estimate the total number of documents
-  eRes <- runHalAPIClient $ search (Just requestedFields) [q] Nothing (Just 0) (Just 1)
-  pure $ count' <$> eRes
-    where
-      count' :: Response Corpus -> Integer
-      count' (Response { _numFound }) = _numFound
+  eRes <- runHalAPIClient $ search (Just requestedFields) [q] Nothing (Just 0) (Just 1) :: IO (Either ClientError (Response Corpus))
+  pure $ _numFound <$> eRes
       
 requestedFields :: Text
 requestedFields = "docid,title_s,abstract_s,submittedDate_s,source_s,authFullName_s,authOrganism_s"