    {-# LANGUAGE DeriveDataTypeable #-}
    module Development.Shake.Internal.CmdOption(CmdOption(..)) where

    import Data.Data
    import qualified Data.ByteString.Lazy.Char8 as LBS

    -- | Options passed to 'command' or 'cmd' to control how processes are executed.
    data CmdOption
        = Cwd FilePath -- ^ Change the current directory in the spawned process. By default uses this processes current directory.
        | Env [(String,String)] -- ^ Change the environment variables in the spawned process. By default uses this processes environment.
        | AddEnv String String -- ^ Add an environment variable in the child process.
        | RemEnv String -- ^ Remove an environment variable from the child process.
        | AddPath [String] [String] -- ^ Add some items to the prefix and suffix of the @$PATH@ variable.
        | Stdin String -- ^ Given as the @stdin@ of the spawned process. By default the @stdin@ is inherited.
        | StdinBS LBS.ByteString -- ^ Given as the @stdin@ of the spawned process.
        | FileStdin FilePath -- ^ Take the @stdin@ from a file.
        | Shell -- ^ Pass the command to the shell without escaping - any arguments will be joined with spaces. By default arguments are escaped properly.
        | BinaryPipes -- ^ Treat the @stdin@\/@stdout@\/@stderr@ messages as binary. By default 'String' results use text encoding and 'ByteString' results use binary encoding.
        | Traced String -- ^ Name to use with 'traced', or @\"\"@ for no tracing. By default traces using the name of the executable.
        | Timeout Double -- ^ Abort the computation after N seconds, will raise a failure exit code. Calls 'interruptProcessGroupOf' and 'terminateProcess', but may sometimes fail to abort the process and not timeout.
        | WithStdout Bool -- ^ Should I include the @stdout@ in the exception if the command fails? Defaults to 'False'.
        | WithStderr Bool -- ^ Should I include the @stderr@ in the exception if the command fails? Defaults to 'True'.
        | EchoStdout Bool -- ^ Should I echo the @stdout@? Defaults to 'True' unless a 'Stdout' result is required or you use 'FileStdout'.
        | EchoStderr Bool -- ^ Should I echo the @stderr@? Defaults to 'True' unless a 'Stderr' result is required or you use 'FileStderr'.
        | FileStdout FilePath -- ^ Should I put the @stdout@ to a file.
        | FileStderr FilePath -- ^ Should I put the @stderr@ to a file.
        | AutoDeps -- ^ Compute dependencies automatically.
          deriving (Eq,Ord,Show,Data,Typeable)