Control.Pipe.Tee

The tee combinators act like idP, but also send a copy of the input to the supplied Consumer (e.g. a file). This is typically done for the purpose of logging a pipeline, showing progress, etc.

Documentation

tee

Arguments

:: Monad m

=> Pipe a Void m r

Consumer that will receive a copy of all the input

-> Pipe a a m r

Acts like idP, but also passes a copy to the supplied consumer.

teeFile

Arguments

:: MonadIO m

=> (a -> ByteString)

function to convert the value to a ByteString which can be written to the log

-> FilePath

file to log to

-> Pipe a a m ()

Acts like idP, but also writes a copy to a file.

teeFileBS

Arguments

:: MonadIO m

=> FilePath

file to log to

-> Pipe ByteString ByteString m ()

Acts like, idP, but also writes a copy to the specified log file.

This function is equivalent to teeFile id.