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src/Data/List/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.List.Local
+    ( -- groupByFst
+    )
+where
+
+import Prelude
+
+-- | Takes a list of pairs and groups them by consecutive ranges with equal
+-- first element. Returns a list of pairs, where each pair corresponds to one
+-- such range.
+groupByFst :: Eq a => [(a, b)] -> [(a, [b])]
+groupByFst []          = []
+groupByFst ((x, y):ps) =
+    let (same, rest) = span ((== x) . fst) ps
+    in  (x, y : map snd same) : groupByFst rest