Initial commit - v0.1.0.0

.gitignore

+.stack-work/
+*~
\ No newline at end of file

.gitlab-ci.yml

+image: nixos/nix:latest
+
+before_script:
+- export LC_ALL=C.UTF-8
+- nix-env -iA nixpkgs.stack
+- nix-env -iA nixpkgs.hlint
+
+stages:
+- lint 
+- build
+
+lint:
+  stage: lint
+  script:
+  - hlint .
+
+build:
+  stage: build
+  script:
+  - stack --nix build --ghc-options "-Wall -Werror"

ChangeLog.md

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

LICENSE

+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.

README.md

+# 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.

package.yaml

+name:                polysemy-extra
+version:             0.1.0.0
+git:                 https://gitlab.com/homotopic-tech/polysemy-extra
+license:             MIT
+author:              "Daniel Firth"
+maintainer:          "dan.firth@homotopic.tech"
+copyright:           "2020 Daniel Firth"
+
+extra-source-files:
+- README.md
+- ChangeLog.md
+
+synopsis:            Run a KVStore as a filesystem in polysemy.
+category:            Polysemy
+
+dependencies:
+- base >= 4.7 && < 5
+- containers
+- polysemy
+- polysemy-zoo
+
+library:
+  source-dirs: src

polysemy-extra.cabal

+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

src/Polysemy/Extra.hs

+{-# 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'

stack.yaml

+resolver: nightly-2020-10-29
+packages:
+- .
+extra-deps:
+- compact-0.2.0.0
+- polysemy-zoo-0.7.0.1
+- unliftio-path-0.0.2.0

stack.yaml.lock

+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages:
+- completed:
+    hackage: compact-0.2.0.0@sha256:9c5785bdc178ea6cf8f514ad35a78c64220e3cdb22216534e4cf496765551c7e,2345
+    pantry-tree:
+      size: 546
+      sha256: 6f7da573fbcddc109e1521edc07f1b34d7506473a3930074453e829daf901d71
+  original:
+    hackage: compact-0.2.0.0
+- completed:
+    hackage: polysemy-zoo-0.7.0.1@sha256:60c2921df95f61d43222a75adde4f330e9510320b416132838a354cd81b4bcc5,3846
+    pantry-tree:
+      size: 2979
+      sha256: af39e295a7831e6bca01fa78df6c538cb6f1dfb339d118056fd0d9c314925726
+  original:
+    hackage: polysemy-zoo-0.7.0.1
+- completed:
+    hackage: unliftio-path-0.0.2.0@sha256:cf4b02640b99831004853e8fc9f9ff922514d08a24ea36e09e8e7a77b250bc80,787
+    pantry-tree:
+      size: 281
+      sha256: 96fc899a5d4935c5eb8075e5f65a2c5eb046282ad9aac0fadcb3cbad9bdca164
+  original:
+    hackage: unliftio-path-0.0.2.0
+snapshots:
+- completed:
+    size: 543560
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/nightly/2020/10/29.yaml
+    sha256: c8101bf4e679881fd9a6c8dcbdfc9586e119bdb2aad401f5c7e9bc0f8dac5622
+  original: nightly-2020-10-29