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Changelog for polysemy

Unreleased

1.9.1.0 (2023-04-09)

Other Changes

  • Support GHC 9.6

Breaking Changes

Other Changes

1.9.0.0 (2022-12-28)

Breaking Changes

  • Slightly modified the signatures of the various Scoped interpreters.

Other Changes

  • Added runScopedNew, a simple but powerful Scoped interpreter. runScopedNew can be considered a sneak-peek of the future of Scoped, which will eventually receive a major API rework to make it both simpler and more expressive.
  • Fixed a bug in various Scoped interpreters where a scoped usage of an effect always relied on the nearest enclosing use of scoped from the same Scoped effect, rather than the scoped which handles the effect.
  • Added Polysemy.Opaque, a module for the Opaque effect newtype, meant as a tool to wrap polymorphic effect variables so they don't jam up resolution of Member constraints.
  • Expose the type alias Scoped_ for a scoped effect without callsite parameters.

1.8.0.0 (2022-12-22)

Breaking Changes

  • Removed Polysemy.View
  • Removed Polysemy.Law
  • Removed (@) and (@@) from Polysemy
  • Removed withLowerToIO from Polysemy. Use withWeavingToFinal instead.
  • Removed asyncToIO and lowerAsync from Polysemy.Async. Use asyncToIOFinal instead.
  • Removed lowerEmbedded from Polysemy.IO. Use embedToMonadIO instead.
  • Removed lowerError from Polysemy.Error. Use errorToIOFinal instead.
  • Removed resourceToIO and lowerResource from Polysemy.Resource. Use resourceToIOFinal instead.
  • Removed runFixpoint and runFixpointM from Polysemy.Fixpoint. Use fixpointToFinal instead.
  • Changed semantics of errorToIOFinal so that it no longer catches errors from other handlers of the same type.
  • The semantics of runScoped has been changed so that the provided interpreter is now used only once per use of scoped, instead of each individual action.

Other Changes

  • Exposed send from Polysemy.
  • Dramatically improved build performance of projects when compiling with -O2.
  • Removed the debug dump-core flag.
  • Introduced the new meta-effect Scoped, which allows running an interpreter locally whose implementation is deferred to a later stage.
  • Fixed a bug in various Scoped interpreters where any explicit recursive interpretation of higher-order computations that the handler may perform are ignored by the interpreter, and the original handler was reused instead.

1.7.1.0 (2021-11-23)

Other Changes

  • Support GHC 9.2.1

1.7.0.0 (2021-11-16)

Breaking Changes

  • Added interpreters for AtomicState that run in terms of State.
  • Removed MemberWithError
  • Removed DefiningModule

Other Changes

  • The internal ElemOf proof is now implemented as an unsafe integer, significantly cutting down on generated core.
  • Polysemy no longer emits custom type errors for ambiguous effect actions. These have long been rendered moot by polysemy-plugin, and the cases that they still exist are usually overeager (and wrong.)
  • As a result, the core produced by polysemy is significantly smaller. Programs should see a reduction of ~20% in terms and types, and ~60% in coercions.

1.6.0.0 (2021-07-12)

Breaking Changes

  • Deprecate traceToIO and replace it with traceToStdout and traceToStderr
  • Support GHC 9.0.1

Other Changes

  • Added the combinator insertAt, which allows adding effects at a specified index into the effect stack
  • Added Semigroup and Monoid for Sem

1.5.0.0 (2021-03-30)

Breaking Changes

  • Dropped support for GHC 8.4

Other Changes

  • Added InterpretersFor as a shorthand for interpreters consuming multiple effects
  • Added runTSimple and bindTSimple, which are simplified variants of runT and bindT

1.4.0.0 (2020-10-31)

Breaking Changes

  • Added Polysemy.Async.cancel to allow cancelling Async action (possible name collision) (#321, thanks to @aidangilmore)

Other Changes

  • Added Polysemy.Input.inputs to mirror Polysemy.Reader.asks (#327, thanks to @expipiplus1)
  • Added Polysemy.Resource.bracket_ (#335, thanks to @expipiplus1)
  • Support GHC 8.10.x (#337, #382)
  • Restrict the existentially quantified monad in a Weaving to Sem r (#333, thanks to @A1kmm)
  • Added raise2Under and raise3Under (#369)
  • Added Raise and Subsume (#370)
  • Fixed memory leaks in Applicative (Sem r) methods (#372, thanks to @goertzenator)
  • Smaller suggestions and fixes (thanks to @jeremyschlatter, @galagora and @felixonmars)

1.3.0.0 (2020-02-14)

Breaking Changes

  • The semantics for runNonDet when <|> is used inside a higher-order action of another effect has been reverted to that of 1.1.0.0 and earlier. (See issue #246)
  • Type parameters for outputToTrace have been rearranged (thanks to @juanpaucar)

Other Changes

  • Added Bundle effect, for bundling multiple effects into a single one.
  • Added Tagged effect, for annotating and disambiguating identical effects.
  • Added View effect, an Input-like effect for caching an expensive computation.
  • Added fromException/Via and fromExceptionSem/Via
  • Added note
  • Added catchJust, try and tryJust (thanks to @bolt12)
  • Using listen with runWriterTVar or writerToIO will no longer delay writing until the listen completes.
  • Added runStateSTRef and stateToST (thanks to @incertia)
  • Added execState and execLazyState (thanks to @tjweir)
  • Added Polysemy.Law, which offers machinery for creating laws for effects.
  • Added Polysemy.Membership for retrieving and making use of effect membership proofs.

1.2.3.0 (2019-10-29)

  • Polysemy now works on GHC 8.8.1 (thanks to @googleson78 and @sevanspowell)
  • Exported MemberWithError from Polysemy
  • Added rewrite and transform interpretation combinators

1.2.2.0 (2019-10-22)

  • Fixed a bug in resourceToIO and resourceToIOFinal that prevented the finalizers from being called in BracketOnError when the computation failed due to a Sem failure
  • Added atomicGets (thanks to @googleson78)
  • Added sequenceConcurrently to Polysemy.Async (thanks to @spacekitteh)

1.2.1.0 (2019-09-15)

  • Added InterpreterFor (thanks to @bolt12)
  • Bumped bounds for first-class-families

1.2.0.0 (2019-09-04)

Breaking Changes

  • All lower- interpreters have been deprecated, in favor of corresponding -Final interpreters.
  • runFixpoint and runFixpointM have been deprecated in favor of fixpointToFinal.
  • The semantics for runNonDet when <|> is used inside a higher-order action of another effect has been changed.
  • Type variables for certain internal functions, failToEmbed, and atomicState' have been rearranged.

Other changes

  • Added Final effect, an effect for embedding higher-order actions in the final monad of the effect stack. Any interpreter should use this instead of requiring to be provided an explicit lowering function to the final monad.
  • Added Strategy environment for use together with Final
  • Added asyncToIOFinal, a better alternative of lowerAsync
  • Added errorToIOFinal, a better alternative of lowerError
  • Added fixpointToFinal, a better alternative of runFixpoint and runFixpointM
  • Added resourceToIOFinal, a better alternative of lowerResource
  • Added outputToIOMonoid and outputToIOMonoidAssocR
  • Added stateToIO
  • Added atomicStateToIO
  • Added runWriterTVar, writerToIOFinal, and writerToIOAssocRFinal
  • Added writerToEndoWriter
  • Added subsume operation
  • Exposed raiseUnder/2/3 in Polysemy

1.1.0.0 (2019-08-15)

Breaking Changes

  • MonadFail is now implemented in terms of Fail, instead of NonDet (thanks to @KingoftheHomeless)
  • LastMember has been removed. withLowerToIO and all interpreters that make use of it now only requires Member (Embed IO) r (thanks to @KingoftheHomeless)
  • State and Writer now have better strictness semantics

Other Changes

  • Added AtomicState effect (thanks to @KingoftheHomeless)
  • Added Fail effect (thanks to @KingoftheHomeless)
  • Added runOutputSem (thanks to @cnr)
  • Added modify', a strict variant of modify (thanks to @KingoftheHomeless)
  • Added right-associative variants of runOutputMonoid and runWriter (thanks to @KingoftheHomeless)
  • Added runOutputMonoidIORef and runOutputMonoidTVar (thanks to @KingoftheHomeless)
  • Improved Fixpoint so it won't always diverge (thanks to @KingoftheHomeless)
  • makeSem will now complain if DataKinds isn't enabled (thanks to @pepegar)

1.0.0.0 (2019-07-24)

Breaking Changes

  • Renamed Lift to Embed (thanks to @googleson78)
  • Renamed runAsyncInIO to lowerAsync
  • Renamed runAsync to asyncToIO
  • Renamed runBatchOutput to runOutputBatched
  • Renamed runConstInput to runInputConst
  • Renamed runEmbed to runEmbedded (thanks to @googleson78)
  • Renamed runEmbedded to lowerEmbedded
  • Renamed runErrorAsAnother to mapError
  • Renamed runErrorInIO to lowerError
  • Renamed runFoldMapOutput to runOutputMonoid
  • Renamed runIO to embedToMonadIO
  • Renamed runIgnoringOutput to ignoreOutput
  • Renamed runIgnoringTrace to ignoreTrace
  • Renamed runInputAsReader to inputToReader
  • Renamed runListInput to runInputList
  • Renamed runMonadicInput to runInputSem
  • Renamed runOutputAsList to runOutputList
  • Renamed runOutputAsTrace to outputToTrace
  • Renamed runOutputAsWriter to outputToWriter
  • Renamed runResourceBase to resourceToIO
  • Renamed runResourceInIO to lowerResource
  • Renamed runStateInIORef to runStateIORef
  • Renamed runTraceAsList to runTraceList
  • Renamed runTraceAsOutput to traceToOutput
  • Renamed runTraceIO to traceToIO
  • Renamed sendM to embed (thanks to @googleson78)
  • The NonDet effect is now higher-order (thanks to @KingoftheHomeless)

Other Changes

  • Added evalState and evalLazyState
  • Added runNonDetMaybe (thanks to @KingoftheHomeless)
  • Added nonDetToError (thanks to @KingoftheHomeless)
  • Haddock documentation for smart constructors generated via makeSem will no longer have weird variable names (thanks to @TheMatten)

0.7.0.0 (2019-07-08)

Breaking Changes

  • Added a Pass constructor to Writer (thanks to @KingoftheHomeless)
  • Fixed a bug in runWriter where the MTL semantics wouldn't be respected (thanks to @KingoftheHomeless)
  • Removed the Censor constructor of Writer (thanks to @KingoftheHomeless)
  • Renamed Yo to Weaving
  • Changed the visible type applications for asks, gets, runEmbedded, fromEitherM and runErrorAsAnother

Other Changes

  • Fixed haddock generation

0.6.0.0 (2019-07-04)

Breaking Changes

  • Changed the type of runBatchOutput to be more useful (thanks to @Infinisil)

Other Changes

  • THE ERROR MESSAGES ARE SO MUCH BETTER :party: :party: :party:
  • Added runEmbedded to Polysemy.IO
  • Added runOutputAsList to Polysemy.Output (thanks to @googleson78)
  • Asymptotically improved the performance of runTraceAsList (thanks to @googleson78)

0.5.1.0 (2019-06-28)

  • New combinators for Polysemy.Error: fromEither and fromEitherM

0.5.0.1 (2019-06-27)

  • Fixed a bug where intercept and interceptH wouldn't correctly handle higher-order effects

0.5.0.0 (2019-06-26)

Breaking Changes

  • Removed the internal Effect machinery

New Effects and Interpretations

  • New effect; Async, for describing asynchronous computations
  • New interpretation for Resource: runResourceBase, which can lower Resource effects without giving a lowering natural transformation
  • New interpretation for Trace: runTraceAsList
  • New combinator: withLowerToIO, which is capable of transforming IO-invariant functions as effects.

Other Changes

  • Lots of hard work on the package and CI infrastructure to make it green on GHC 8.4.4 (thanks to @jkachmar)
  • Changed the order of the types for runMonadicInput to be more helpful (thanks to @tempname11)
  • Improved the error machinery to be more selective about when it runs
  • Factored out the TH into a common library for third-party consumers

0.4.0.0 (2019-06-12)

Breaking Changes

  • Renamed runResource to runResourceInIO

Other Changes

  • Added runResource, which runs a Resource purely
  • Added onException, finally and bracketOnError to Resource
  • Added a new function, runResource which performs bracketing for pure code

0.3.0.1 (2019-06-09)

  • Fixed a type error in the benchmark caused by deprecation of Semantic

0.3.0.0 (2019-06-01)

Breaking Changes

  • Removed all deprecated names
  • Moved Random effect to polysemy-zoo

Other Changes

  • makeSem can now be used to create term-level operators (thanks to @TheMatten)

0.2.2.0 (2019-05-30)

  • Added getInspectorT to the Tactical functions, which allows polysemy code to be run in external callbacks
  • A complete rewrite of Polysemy.Internal.TH.Effect (thanks to @TheMatten)
  • Fixed a bug in the TH generation of effects where the splices could contain usages of effects that were ambiguous

0.2.1.0 (2019-05-27)

  • Fixed a bug in the Alternative instance for Sem, where it would choose the last success instead of the first
  • Added MonadPlus and MonadFail instances for Sem

0.2.0.0 (2019-05-23)

Breaking Changes

  • Lower precedence of .@ and .@@ to 8, from 9

Other Changes

  • Fixed a serious bug in interpretH and friends, where higher-order effects would always be run with the current interpreter.
  • Users need no longer require inlineRecursiveCalls --- the polysemy-plugin-0.2.0.0 will do it automatically when compiling with -O
  • Deprecated inlineRecursiveCalls; slated for removal in the next version

0.1.2.1 (2019-05-18)

  • Give explicit package bounds for dependencies
  • Haddock improvements
  • Remove Typeable machinery from Polysemy.Internal.Union (thanks to @googleson78)

0.1.2.0 (2019-04-26)

  • runInputAsReader, runTraceAsOutput and runOutputAsWriter have more generalized types
  • Added runStateInIO
  • Added runOutputAsTrace
  • Added Members (thanks to @TheMatten)

0.1.1.0 (2019-04-14)

  • Added runIO interpretation (thanks to @adamConnerSax)
  • Minor documentation fixes

0.1.0.0 (2019-04-11)

  • Initial release