On Tue, Apr 12, 2011 at 11:40 AM, Jon Kristensen
Hello Haskellers!
I have developed a very simple logging library to be extendable and easy-to-use. You can see the current release at http://hackage.haskell.org/package/hlogger/. The SimpleHLogger module is an example of what a HLogger implementation could look like. It could be used like this:
import System.Log.SimpleHLogger
main = do
logger <- simpleLogger "test"
loggerLog logger (Just ("LoggerTest", "main")) Debug "Test"
loggerStop logger
As I have now implemented everything that I could think of, I would like to ask the Haskell community to give some feedback on HLogger so that I can continuing improving it. Some questions:
It looks very simple, which is nice. Just about the only things I would add: * A standard-out/standard-error logger * A monoid instance for the Logger type * Convinience functions for logging without context and logging at a specific error level:
logError myLogger "Oh no!" logDebug myLogger "a thing happened"
These might be in a separate module, so I can define them for myslef based on some logContext function, so that in my module I can define:
logError msg = logContext "Module.Name" LogLevelError msg
You might even be able to offer a separate package with TemplateHaskell splices to build these helpers. Maybe I'm going off the deep-end it terms of complexity. Have you looked into HsLogger at all? This project has a confusingly similar name - so much so I thought that your email was about HsLogger! Take care, Antoine
Do you have any general/architectural thoughts on things I might be doing wrong? Is the ease-of-use goal contradicting making this library useful in more complex applications? Do I want to redesign HLogger to allow loggers to have a mutable state, and if so, how can I do that? Is there a nice way to provide the module and the function than using (Just ("LoggerTest, "main)) (shortening it somehow, I guess)?
Thanks!
Warm regards, Jon Kristensen
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