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28 lines
722 B
Haskell
Executable File
28 lines
722 B
Haskell
Executable File
#!/usr/bin/env runhaskell
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-- |
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-- Module : Main
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-- Copyright : (c) 2013-2016 Galois, Inc.
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-- License : BSD3
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-- Maintainer : cryptol@galois.com
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-- Stability : provisional
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-- Portability : portable
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{- A utility for spliting a long column of stuff into multiple columns. -}
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import Data.List(transpose)
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rs = 4 -- number of rows per column
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spacing = 4 -- blanks between columns
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main = interact (unlines . map concat . transpose . map toCol . chop rs . lines)
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colWidth xs = spacing + maximum (0 : map length xs)
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padTo x xs = xs ++ replicate (x - length xs) ' '
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toCol xs = map (padTo (colWidth xs)) xs
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chop n [] = []
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chop n xs = let (as,bs) = splitAt n xs
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in as : chop n bs
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