Eventually-decentralized project hosting and management platform

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src / Data / Tree /

Local.hs

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{- This file is part of Vervis.
 -
 - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Data.Tree.Local
    ( sortForestOn
    )
where

import Data.List (sortOn)
import Data.Tree

sortForestOn :: Ord b => (a -> b) -> Forest a -> Forest a
sortForestOn f =
    sortOn (f . rootLabel) . map (\ (Node r s) -> Node r $ sortForestOn f s)
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