Control.Monad.Logger.Extras

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

Monoid Logger

Defined in Control.Monad.Logger.Extras

Methods

mempty :: Logger

mappend :: Logger -> Logger -> Logger

mconcat :: [Logger] -> Logger

Semigroup Logger

Defined in Control.Monad.Logger.Extras

Methods

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

sconcat :: NonEmpty Logger -> Logger

stimes :: Integral b => b -> 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".

colorize :: Logger -> Logger

Add colors to your log output based on LogLevel. Colors can be customized by using colorizeWith instead.

colorizeWith :: [(LogLevel, Color)] -> Logger -> Logger

Add a custom set of colors to your log output. See defaultColors for an example.

defaultColors :: [(LogLevel, Color)]

The default color mapping used by colorize.

mapLogStrBS :: ToLogStr msg => (ByteString -> msg) -> LogStr -> LogStr

Map a function over a log string.

wrapSGRCode :: [SGR] -> ByteString -> ByteString

Apply SGR codes to a string to modify its display attributes, resetting SGR codes afterward.

wrapSGRColor :: Color -> ByteString -> ByteString

Apply an SGR color code to a string, unsetting the color after the string.

test :: IO ()

A handy test