columnv2 => moins de lignes, utilisation de list comprehension

haskell/columnv2.hs

@@ -0,0 +1,19 @@
+import Data.List as L
+
+formatLine :: [String] -> [String]
+formatLine x = map (\e -> e ++ [' ' | _ <- [length e..nb]]) x
+               where nb = maximum $ map length x
+
+formatLines :: [[String]] -> [[String]]
+formatLines x = map formatLine x
+
+completeMatrix :: [[String]] -> [[String]]
+completeMatrix m = map (\e -> e ++ [""| _ <- [length e..nb]]) m
+                   where nb = maximum $ map length m
+
+column :: [[String]] -> [[String]]
+column x = L.transpose $ formatLines $ L.transpose $ completeMatrix x
+
+main = do
+    content <- getContents
+    putStr $ unlines $ map unwords $ column $ map words $ lines content