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module Command (
CommonOptions(..),
defaultCommonOptions,
Command(..),
CommandArgumentsType(..),
CommandExec(..),
CommandInput(..),
getCommonOptions,
getConfigPath,
getConfig,
getTerminalOutput,
) where
import Control.Monad.Except
import Control.Monad.Reader
import Data.Kind
import Data.Text (Text)
import Data.Text qualified as T
import System.Console.GetOpt
import System.Exit
import System.IO
import Config
import Terminal
data CommonOptions = CommonOptions
{ optJobs :: Int
}
defaultCommonOptions :: CommonOptions
defaultCommonOptions = CommonOptions
{ optJobs = 2
}
class CommandArgumentsType (CommandArguments c) => Command c where
commandName :: proxy c -> String
commandDescription :: proxy c -> String
type CommandOptions c :: Type
type CommandOptions c = ()
commandOptions :: proxy c -> [OptDescr (CommandOptions c -> CommandOptions c)]
commandOptions _ = []
defaultCommandOptions :: proxy c -> CommandOptions c
default defaultCommandOptions :: CommandOptions c ~ () => proxy c -> CommandOptions c
defaultCommandOptions _ = ()
type CommandArguments c :: Type
type CommandArguments c = ()
commandUsage :: proxy c -> Text
commandInit :: CommandArgumentsType (CommandArguments c) => proxy c -> CommandOptions c -> CommandArguments c -> c
commandExec :: c -> CommandExec ()
class CommandArgumentsType args where
argsFromStrings :: [String] -> Except String args
instance CommandArgumentsType () where
argsFromStrings [] = return ()
argsFromStrings _ = throwError "no argument expected"
instance CommandArgumentsType Text where
argsFromStrings [str] = return $ T.pack str
argsFromStrings _ = throwError "expected single argument"
instance CommandArgumentsType (Maybe Text) where
argsFromStrings [] = return $ Nothing
argsFromStrings [str] = return $ Just (T.pack str)
argsFromStrings _ = throwError "expected at most one argument"
instance CommandArgumentsType [ Text ] where
argsFromStrings strs = return $ map T.pack strs
newtype CommandExec a = CommandExec (ReaderT CommandInput IO a)
deriving (Functor, Applicative, Monad, MonadIO)
data CommandInput = CommandInput
{ ciOptions :: CommonOptions
, ciConfigPath :: Maybe FilePath
, ciConfig :: Either String Config
, ciTerminalOutput :: TerminalOutput
}
getCommonOptions :: CommandExec CommonOptions
getCommonOptions = CommandExec (asks ciOptions)
getConfigPath :: CommandExec FilePath
getConfigPath = CommandExec $ do
asks ciConfigPath >>= \case
Nothing -> liftIO $ do
hPutStrLn stderr "no config file found"
exitFailure
Just path -> return path
getConfig :: CommandExec Config
getConfig = CommandExec $ do
asks ciConfig >>= \case
Left err -> liftIO $ do
hPutStrLn stderr err
exitFailure
Right config -> return config
getTerminalOutput :: CommandExec TerminalOutput
getTerminalOutput = CommandExec (asks ciTerminalOutput)
|