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{- This is a simple merge sort -}
module Merge where
merge :: [Int] -> [Int] -> [Int]
merge [] x = x
merge x [] = x
merge l1@(a:b) l2@(c:d) | a < c = a:(merge b l2)
| otherwise = c:(merge l1 d)
half [] = []
half [x] = [x]
half (x:y:z) = x:r where r = half z
sort [] = []
sort [x] = [x]
sort l = merge (sort odds) (sort evens) where
odds = half l
evens = half (tail l)
main =
appendChan stdout "Enter a list of integers separated by \",\"\n" abort $
readChan stdin abort $ \ input ->
appendChan stdout
(show (sort (read ("[" ++ (head (lines input)) ++ "]"))))
abort done
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