column v3, stop me if you can

haskell/columnv3.hs

@@ -0,0 +1,13 @@
+import Data.List as L
+
+formatLine :: [String] -> [String]
+formatLine x = map (\e -> e ++ [' ' | _ <- [length e..nb]]) x
+               where nb = maximum $ map length x
+
+completeMatrix :: [[String]] -> [[String]]
+completeMatrix m = map (\e -> e ++ [""| _ <- [length e..nb]]) m
+                   where nb = maximum $ map length m
+
+main = do
+    content <- getContents
+    putStr $ unlines $ map unwords $ (L.transpose . (\x -> map formatLine x) . L.transpose . completeMatrix) $ map words $ lines content