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28 lines
797 B
Haskell
28 lines
797 B
Haskell
{- This file is part of Vervis.
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-
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- Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
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-
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- ♡ Copying is an act of love. Please copy, reuse and share.
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-
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- The author(s) have dedicated all copyright and related and neighboring
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- rights to this software to the public domain worldwide. This software is
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- distributed without any warranty.
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-
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- You should have received a copy of the CC0 Public Domain Dedication along
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- with this software. If not, see
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- <http://creativecommons.org/publicdomain/zero/1.0/>.
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-}
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module Data.Tree.Local
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( sortForestOn
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)
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where
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import Prelude
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import Data.List (sortOn)
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import Data.Tree
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sortForestOn :: Ord b => (a -> b) -> Forest a -> Forest a
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sortForestOn f =
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sortOn (f . rootLabel) . map (\ (Node r s) -> Node r $ sortForestOn f s)
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