Control.Monad.Logger.Extras

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Documentation

runLoggerLoggingT :: LoggingT m a -> Logger -> m a

Run a LoggingT action using the provided Logger

type LogF = Loc -> LogSource -> LogLevel -> LogStr -> IO ()

Type synonym for a logging action. See defaultLogStr for the default formatting of this data.

newtype Logger

A composable logging action.

Constructors

Logger

Fields

• unLogger :: LogF

Instances

Semigroup Logger

Defined in Control.Monad.Logger.Extras

Methods

(<>) :: Logger -> Logger -> Logger

sconcat :: NonEmpty Logger -> Logger

stimes :: Integral b => b -> Logger -> Logger

Monoid Logger

Defined in Control.Monad.Logger.Extras

Methods

mempty :: Logger

mappend :: Logger -> Logger -> Logger

mconcat :: [Logger] -> Logger

logToStderr :: Logger

Composable stderr logging action.

logToStdout :: Logger

Composable stdout logging action.

logToNowhere :: Logger

This logger doesn't perform any logging action.

logToSyslog :: String -> Logger

Log messages to a posix system log. The string argument is a tag that can be used to identify log messages produced by this logger. You can, for instance, run journalctl --user -t mytag to see log messages tagged with "mytag".