tea-cleaner: Read configuration file

tea-cleaner/TeaCleaner/Configuration.hs

@@ -0,0 +1,72 @@
+module TeaCleaner.Configuration
+    ( ProgramOptions(..)
+    , Settings(..)
+    , decodeSettingsFile
+    , commandLineInfo
+    , execParser
+    ) where
+
+import GHC.Records (HasField(..))
+import Data.Text (StrictText)
+import qualified Toml
+import Toml ((.=))
+import Options.Applicative
+    ( Parser
+    , ParserInfo
+    , (<**>)
+    , execParser
+    , fullDesc
+    , help
+    , helper
+    , info
+    , long
+    , progDesc
+    , switch
+    )
+import Text.URI (URI)
+import qualified Text.URI as URI
+import Data.Time (UTCTime(..), getCurrentTime)
+
+data ConfigFile = ConfigFile
+    { token :: StrictText
+    , server :: StrictText
+    } deriving (Eq, Show)
+
+configFileCodec :: Toml.TomlCodec ConfigFile
+configFileCodec = ConfigFile
+    <$> Toml.text "token" .= getField @"token"
+    <*> Toml.text "server" .= getField @"server"
+
+data Settings = Settings
+    { token :: StrictText
+    , server :: URI
+    , now :: UTCTime
+    } deriving (Eq, Show)
+
+decodeSettingsFile :: FilePath -> IO Settings
+decodeSettingsFile configPath = Toml.decodeFile configFileCodec configPath
+    >>= withConfiguration
+  where
+    withConfiguration configFile@ConfigFile{ server } = URI.mkURI server
+        >>= withServer configFile
+    withServer configFile parsedServer = getCurrentTime
+        >>= withTime configFile parsedServer
+    withTime ConfigFile{..} parsedServer now = pure $ Settings
+        { token = token
+        , server = parsedServer
+        , now = now
+        }
+
+newtype ProgramOptions = ProgramOptions
+    { liveRun :: Bool
+    } deriving (Eq, Show)
+
+commandLineInfo :: ParserInfo ProgramOptions
+commandLineInfo = info (commandLine <**> helper)
+    $ fullDesc <> progDesc "Helps to detect some spam gitea accounts"
+
+commandLine :: Parser ProgramOptions
+commandLine = ProgramOptions
+    <$> liveRunOption
+  where
+    liveRunOption = switch $ long "live-run" <> help "Purge suspicious users"