experiment with Finnish morphology

examples/uusisuomi/MyDiff.hs

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+module Main where
+
+import System
+
+-- compare lines word-by-word, returning difference pairs with their positions
+
+main = do
+  x:y:_ <- getArgs
+  old <- readFile x >>= return . lines
+  new <- readFile y >>= return . lines
+  mapM_ comp (zip old new)
+
+comp (ws1,ws2) = do
+  let diffs = [form ++ ":" ++ w1 ++ "-" ++ w2 | 
+        (form,(w1,w2)) <- zip forms (zip (words ws1) (words ws2)), diff w2 w1]
+  putStr $ unwords diffs
+  if null diffs then return () else putStrLn ""
+
+forms = map show [1..]
+
+diff w ws = notElem w (chop ws) where
+  chop cs = case span (/='/') cs of
+    ([],_)  -> []
+    (w1,ww) -> w1:chop (drop 1 ww)
+