System.Log.Logger.TH

Description

This module provides a function that generates hslogger functions automatically using Template Haskell.

Synopsis

Documentation

Arguments

:: String	Must match qualifier on import of System.Log.Logger.
-> [Priority]	List of priorities for which to generate logging functions.
-> Q [Dec]

Generate hslogger functions for given priorities.

Example usage:

 module Foo.Bar ( ... ) where

 import System.Log.Logger.TH (deriveLoggers)
 import qualified System.Log.Logger as HSL

 $(deriveLoggers "HSL" [HSL.DEBUG, HSL.INFO])

Used this way, deriveLoggers would generate the following functions:

 info :: String -> IO ()
 info s = HSL.infoM "Foo.Bar" ((++) "Foo.Bar: " s)

 debug :: String -> IO ()
 debug s = HSL.debugM "Foo.Bar" ((++) "Foo.Bar: " s)

The other hslogger priorities follow the same pattern.

So

 info "hi there"

would generate the INFO-level log event

 Foo.Bar: hi there

Note: System.Log.Logger must be imported qualified, and the qualifier must match the qualifier given to deriveLoggers.