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Bump containers to >= 0.5.8 simplifying shuffleSeq (#352) #358

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Bump containers to >= 0.5.8 simplifying shuffleSeq (#352) #358

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2 changes: 1 addition & 1 deletion hedgehog-example/hedgehog-example.cabal
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ library
hedgehog
, hedgehog-quickcheck
, base >= 3 && < 5
, containers >= 0.4 && < 0.7
, containers >= 0.5.8 && < 0.7
, filepath >= 1.3 && < 1.5
, hashtables >= 1.2 && < 1.3
, mmorph >= 1.0 && < 1.2
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4 changes: 2 additions & 2 deletions hedgehog/hedgehog.cabal
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Expand Up @@ -53,7 +53,7 @@ library
, async >= 2.0 && < 2.3
, bytestring >= 0.10 && < 0.11
, concurrent-output >= 1.7 && < 1.11
, containers >= 0.4 && < 0.7
, containers >= 0.5.8 && < 0.7
, directory >= 1.2 && < 1.4
, erf >= 2.0 && < 2.1
, exceptions >= 0.7 && < 0.11
Expand Down Expand Up @@ -137,7 +137,7 @@ test-suite test
build-depends:
hedgehog
, base >= 3 && < 5
, containers >= 0.4 && < 0.7
, containers >= 0.5.8 && < 0.7
, mmorph >= 1.0 && < 1.2
, mtl >= 2.1 && < 2.3
, pretty-show >= 1.6 && < 1.10
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15 changes: 0 additions & 15 deletions hedgehog/src/Hedgehog/Internal/Gen.hs
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Expand Up @@ -1607,26 +1607,11 @@ shuffleSeq xs =
pure Seq.empty
else do
n <- integral $ Range.constant 0 (length xs - 1)
#if MIN_VERSION_containers(0,5,8)
-- Data.Sequence should offer a version of deleteAt that returns the
-- deleted element, but it does not currently do so. Lookup followed
-- by deletion seems likely faster than splitting and then appending,
-- but I haven't actually tested that. It's certainly easier to see
-- what's going on.
case Seq.lookup n xs of
Just y ->
(y Seq.<|) <$> shuffleSeq (Seq.deleteAt n xs)
Nothing ->
error "Hedgehog.Gen.shuffleSeq: internal error, lookup in empty sequence"
#else
case Seq.splitAt n xs of
(beginning, end) ->
case Seq.viewl end of
y Seq.:< end' ->
(y Seq.<|) <$> shuffleSeq (beginning Seq.>< end')
Seq.EmptyL ->
error "Hedgehog.Gen.shuffleSeq: internal error, lookup in empty sequence"
#endif

------------------------------------------------------------------------
-- Sampling
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