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haskellloggingyesod

Is a simple color enabled logger for Haskell available?

I would like to change the color of a log message output to the terminal depending on log level, topic, etc.,.

The only logger I found that does this in Haskell is part of the xmonad-contrib package, but I don't want to take a dependency on it since it is rather large.

I know that Yesod logs in color, but it is not obvious to me how to make its logger work outside of a Yesod web application.

I looked into hslogger which seems to be very similar to System.Log.Logger, but neither seem to have color support out of the box.

hslogger is extensible via custom LogHandlers, so possibly someone implemented one with color support?

Are there alternatives for logging in Haskell I have overlooked so far?

EDIT:

Following Don Stewart's advice, I implemented a custom log handler that works with hslogger and ansi-c in order to allow logging to the terminal in colors.

Solution

  • As of May 2012, the available logging libraries for Haskell are:

    And some more specialized ones:

    • greg-client - a client to the greg distributed logging system
    • fast-logger - a logging system optimized for fast IO

    None support ansi terminal coloring output. There are several libraries for ansi coloring, so that shouldn't be too hard to add. E.g.