polysemy-extra (empty) → 0.1.0.0

raw patch · 5 files changed

+163/−0 lines, 5 filesdep +basedep +containersdep +polysemy

Dependencies added: base, containers, polysemy, polysemy-zoo

Files

• ChangeLog.md +5/−0
• LICENSE +30/−0
• README.md +5/−0
• polysemy-extra.cabal +37/−0
• src/Polysemy/Extra.hs +86/−0

@@ -0,0 +1,5 @@+# Changelog for polysemy-extra++## v0.1.0.0++* Add several `Input`, `Output` and `KVStore` functions that I use..

@@ -0,0 +1,30 @@+Copyright Daniel Firth (c) 2020++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * Redistributions in binary form must reproduce the above+      copyright notice, this list of conditions and the following+      disclaimer in the documentation and/or other materials provided+      with the distribution.++    * Neither the name of Author name here nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

@@ -0,0 +1,5 @@+# polysemy-extra++This package provides some extra polysemy functions that I use for+transforming `Input`, `Output` and `KVStore`. Maybe this will make+its way into the main library.

@@ -0,0 +1,37 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.34.2.+--+-- see: https://github.com/sol/hpack++name:           polysemy-extra+version:        0.1.0.0+synopsis:       Run a KVStore as a filesystem in polysemy.+category:       Polysemy+author:         Daniel Firth+maintainer:     dan.firth@homotopic.tech+copyright:      2020 Daniel Firth+license:        MIT+license-file:   LICENSE+build-type:     Simple+extra-source-files:+    README.md+    ChangeLog.md++source-repository head+  type: git+  location: https://gitlab.com/homotopic-tech/polysemy-extra++library+  exposed-modules:+      Polysemy.Extra+  other-modules:+      Paths_polysemy_extra+  hs-source-dirs:+      src+  build-depends:+      base >=4.7 && <5+    , containers+    , polysemy+    , polysemy-zoo+  default-language: Haskell2010

@@ -0,0 +1,86 @@+{-# LANGUAGE BlockArguments #-}+{-# LANGUAGE DataKinds      #-}+{-# LANGUAGE ExplicitForAll #-}+{-# LANGUAGE GADTs          #-}+{-# LANGUAGE LambdaCase     #-}+{-# LANGUAGE PolyKinds      #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeApplications #-}+{-# LANGUAGE TypeOperators  #-}+module Polysemy.Extra where++import Data.Map as Map+import Polysemy+import Polysemy.KVStore+import Polysemy.Input+import Polysemy.Output++-- | Run a KVStore in terms of another KVStore by way of pure key and value+-- transformations.+runKVStoreAsKVStore :: forall k v k' v' r a.+                       (k  -> k')+                    -> (v  -> v')+                    -> (v' -> v )+                    -> Sem (KVStore k v ': r) a+                    -> Sem (KVStore k' v' ': r) a+runKVStoreAsKVStore f g h = reinterpret \case+  LookupKV k   -> fmap h <$> lookupKV @k' @v' (f k)+  UpdateKV k x -> updateKV @k' @v' (f k) (fmap g x)++-- | Run a KVStore in terms of another KVStore by way of transforming the+-- keys and values with Sem functions.+runKVStoreAsKVStoreSem :: forall k v k' v' r a.+                          Members '[KVStore k' v'] r+                       => (k  -> Sem r k')+                       -> (v  -> Sem r v')+                       -> (v' -> Sem r v )+                       -> Sem (KVStore k v ': r) a+                       -> Sem r a+runKVStoreAsKVStoreSem f g h = interpret \case+  LookupKV k   -> f k >>= lookupKV @k' @v' >>= sequence . fmap h+  UpdateKV k x -> do+    z  <- f k+    z' <- sequence . fmap g $ x+    updateKV @k' @v' z z'++-- | Run an `Output (Map k v)` as a `KVStore` by writing the values to+-- the keys.+runOutputMapAsKVStore :: Members '[ KVStore k v ] r+                      => Sem (Output (Map k v) ': r) a+                      -> Sem r a+runOutputMapAsKVStore = interpret \case+  Output xs -> mapM_ (uncurry writeKV) (Map.toList xs)++-- | Map an Output forwards +mapOutput :: Members '[ Output o' ] r+          => (o -> o')+          -> Sem (Output o ': r) a+          -> Sem r a+mapOutput f = interpret \case+  Output o -> output (f o)++-- | Map an Output forwards through a monadic function.+mapOutputSem :: Members '[ Output o' ] r+             => (o -> Sem r o')+             -> Sem (Output o ': r) a+             -> Sem r a+mapOutputSem f = interpret \case+  Output o -> f o >>= output++-- | Map an `Input` contravariantly.+contramapInput :: forall i i' r a.+            Members '[ Input i' ] r+         => (i' -> i)+         -> Sem (Input i ': r) a+         -> Sem r a+contramapInput f = interpret \case+  Input -> f <$> input @i'++-- | Map an `Input` contravariantly through a monadic function.+contramapInputSem :: forall i i' r a.+                     Members '[ Input i' ] r+                  => (i' -> Sem r i)+                  -> Sem (Input i ': r) a+                  -> Sem r a+contramapInputSem f = interpret \case+  Input -> f =<< input @i'