Split to multiproject

reddit_pub/src/Data/Config.hs

@@ -0,0 +1,80 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE DerivingVia #-}
+{-# LANGUAGE TypeOperators #-}
+module Data.Config where
+
+import Control.Lens
+import Data.Text (Text)
+import Dhall (FromDhall, Generic, ToDhall, auto, inputFile)
+import Dhall.Deriving
+import Numeric.Natural (Natural)
+import Data.SubReddit (SubReddit)
+
+data Password
+  = Password Text
+  | File FilePath
+  deriving stock (Generic, Show)
+  deriving (FromDhall, ToDhall)
+    via (Codec AsIs Password)
+
+data AMQP = AMQP
+  { amqpVhost :: Text
+  , amqpUsername :: Text
+  , amqpPassword :: Password
+  , amqpHost :: Text
+  }
+  deriving stock (Generic, Show)
+  deriving (FromDhall, ToDhall)
+    via (Codec (Field (CamelCase <<< DropPrefix "amqp"))) AMQP
+
+host :: Lens' AMQP Text
+host = lens amqpHost (\ am txt -> am{amqpHost=txt})
+
+vhost :: Lens' AMQP Text
+vhost = lens amqpVhost (\ am txt -> am{amqpVhost=txt})
+
+username :: Lens' AMQP Text
+username = lens amqpUsername (\ am txt -> am{amqpUsername=txt})
+
+password :: Lens' AMQP Password
+password = lens amqpPassword (\ am txt -> am{amqpPassword=txt})
+
+data Fetcher = Fetcher
+  { fetcherSubreddit :: SubReddit
+  , fetcherEntries :: Natural
+  , fetcherQualifier :: Maybe Qualifier
+  }
+  deriving stock (Show, Generic)
+  deriving (FromDhall, ToDhall) via Codec (Field (CamelCase <<< DropPrefix "fetcher")) Fetcher
+
+subreddit :: Lens' Fetcher SubReddit
+subreddit = lens fetcherSubreddit (\ fe sr -> fe{fetcherSubreddit=sr})
+
+entries :: Lens' Fetcher Natural
+entries = lens fetcherEntries (\ fe nat -> fe{fetcherEntries=nat})
+
+data Qualifier = Top | Controversial
+  deriving stock (Show, Generic)
+  deriving (FromDhall, ToDhall) via Codec (Constructor TitleCase) Qualifier
+
+data Config = Config
+  { configAmqp :: AMQP
+  , configFetchers :: [Fetcher]
+  , configSqlite :: FilePath
+  }
+  deriving stock (Generic, Show)
+  deriving (FromDhall, ToDhall)
+    via (Codec (Field (CamelCase <<< DropPrefix "config"))) Config
+
+amqp :: Lens' Config AMQP
+amqp = lens configAmqp (\ con am -> con{configAmqp=am})
+
+fetchers :: Lens' Config [Fetcher]
+fetchers = lens configFetchers (\ con fes -> con{configFetchers=fes})
+
+sqlite :: Lens' Config FilePath
+sqlite = lens configSqlite (\ con s -> con{configSqlite=s})
+
+readConfig :: FilePath -> IO Config
+readConfig = inputFile auto

reddit_pub/src/Data/Deriving/Aeson.hs

@@ -0,0 +1,41 @@
+{-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE UndecidableInstances #-}
+module Data.Deriving.Aeson
+  ( AesonCodec(..)
+  , type (<<<)
+  , Field
+  , CamelCase
+  , DropPrefix
+  )
+  where
+
+import Control.Lens
+import Data.Aeson
+import qualified Data.Text.Strict.Lens as T
+import Dhall.Deriving
+import GHC.Generics (Generic, Rep)
+
+newtype AesonCodec codec a = AesonCodec a
+
+class ModifyAesonOptions a where
+  modifyAesonOptions :: Options -> Options
+
+instance (ModifyAesonOptions f, ModifyAesonOptions g) => ModifyAesonOptions (f <<< g) where
+  modifyAesonOptions = modifyAesonOptions @f . modifyAesonOptions @g
+
+instance TextFunction f => ModifyAesonOptions (Field f) where
+  modifyAesonOptions opts = opts{fieldLabelModifier = over T.packed (textFunction @f) }
+
+instance (Generic a, ModifyAesonOptions codec, GToJSON' Value Zero (Rep a))
+  => ToJSON (AesonCodec codec a) where
+  toJSON (AesonCodec a) =
+    genericToJSON (modifyAesonOptions @codec defaultOptions) a
+
+instance (ModifyAesonOptions codec, Generic a, GFromJSON Zero (Rep a))
+  => FromJSON (AesonCodec codec a) where
+  parseJSON va =
+    AesonCodec <$> genericParseJSON (modifyAesonOptions @codec defaultOptions) va

reddit_pub/src/Data/SubReddit.hs

@@ -0,0 +1,9 @@
+{-# LANGUAGE DerivingVia #-}
+module Data.SubReddit where
+
+import Dhall (FromDhall, ToDhall)
+
+newtype SubReddit = SubReddit { getSubReddit :: String }
+  deriving Show
+  deriving (FromDhall, ToDhall) via String
+