diff --git a/src/System/Console/Hawk.hs b/src/System/Console/Hawk.hs
index aaaf1a8..66461c0 100644
--- a/src/System/Console/Hawk.hs
+++ b/src/System/Console/Hawk.hs
@@ -122,15 +122,15 @@ hawk config opts expr_str file = do
         -- eval program based on the existence of a delimiter
         case (optDelimiter opts,optMap opts) of
             (Nothing,_) ->
-                interpret (runExpr [printRows ignoreErrors, expr_str])
+                interpret (runExpr file [printRows ignoreErrors, expr_str])
                           (as :: IO ())
             (Just d,False) ->
-                interpret (runExpr [printRows ignoreErrors, expr_str, parseRows d])
+                interpret (runExpr file [printRows ignoreErrors, expr_str, parseRows d])
                           (as :: IO ())
                 -- TODO: avoid keep everything in buffer, repr' should output
                 -- as soon as possible (for example each line)
             (Just d,True) ->
-                interpret (runExprs [runMap [printRow ignoreErrors, expr_str]
+                interpret (runExprs file [runMap [printRow ignoreErrors, expr_str]
                                     ,parseRows d])
                           (as :: IO ())
     case maybe_f of
@@ -140,13 +140,13 @@ hawk config opts expr_str file = do
           compose :: [String] -> String
           compose = L.intercalate "." . P.map (printf "(%s)")
           
-          runExprs :: [String] -> String
-          runExprs = printf "(System.Console.Hawk.Representable.runExprs (%s))"
-                     . compose
+          runExprs :: Maybe FilePath -> [String] -> String
+          runExprs file = printf "(System.Console.Hawk.Representable.runExprs (%s) (%s))"
+                     (P.show file) . compose
           
-          runExpr :: [String] -> String
-          runExpr = printf "(System.Console.Hawk.Representable.runExpr (%s))"
-                    . compose
+          runExpr :: Maybe FilePath -> [String] -> String
+          runExpr file = printf "(System.Console.Hawk.Representable.runExpr (%s) (%s))"
+                    (P.show file) . compose
           
           runMap :: [String] -> String
           runMap = printf "(System.Console.Hawk.Representable.listMap (%s))"
diff --git a/src/System/Console/Hawk/Representable.hs b/src/System/Console/Hawk/Representable.hs
index c8bac48..c627066 100644
--- a/src/System/Console/Hawk/Representable.hs
+++ b/src/System/Console/Hawk/Representable.hs
@@ -44,15 +44,15 @@ listMap = L.map
 parseRows :: StrictBS.ByteString -> C8.ByteString -> [C8.ByteString]
 parseRows delim str = dropLastIfEmpty $ BS.split delim str
 
-runExpr :: (C8.ByteString -> IO ()) -> IO ()
-runExpr f = do
-    stdin <- C8.getContents
-    f stdin
-
-runExprs :: (C8.ByteString -> [IO ()]) -> IO ()
-runExprs f = do
-    stdin <- C8.getContents
-    sequence_ (f stdin)
+runExpr :: Maybe FilePath -> (C8.ByteString -> IO ()) -> IO ()
+runExpr fp f = do
+    input <- maybe C8.getContents C8.readFile fp
+    f input
+
+runExprs :: Maybe FilePath -> (C8.ByteString -> [IO ()]) -> IO ()
+runExprs fp f = do
+    input <- maybe C8.getContents C8.readFile fp
+    sequence_ (f input)
 
 -- ------------------------
 -- Rows class and instances