Safe Haskell	None
Language	Haskell2010

System.Log.Heavy

Contents

Reexports

Description

This is the main module of heavy-logger package. You usually need to import only this module. All generally required modules are re-exported.

For simple usage cases, you may also want to import System.Log.Heavy.Shortcuts module.

Example of usage is:

 import System.Log.Heavy
 import Data.Text.Format.Heavy
 ...

 withLogging backend id $ do liftIO $ putStr "Your name? "
     liftIO $ hFlush stdout
     name <- liftIO $ getLine
     logMessage $ infoMessage "name was {}" (Single name)
     liftIO $ putStrLn $ "Hello, " ++ name

Reexports

module System.Log.Heavy.Types

module System.Log.Heavy.Backends

withLogging Source #

Arguments

:: MonadIO m
=> LogBackend	Logging backend settings
-> (m a -> IO a)	Runner to run `m` within `IO`. For example this may be `runReader` or `evalState`. Use `id` for case when `m` is `IO`.
-> LoggingT m a	Actions within `LoggingT` monad.
-> m a

Run LoggingT monad within some kind of IO monad.