Hi everybody, I have just released a complete API rewrite of the `progress-meter` package: * https://hackage.haskell.org/package/progress-meter * https://github.com/esoeylemez/progress-meter With this package you can easily add live diagnostics to any long-running application from a simple progress bar to full task monitoring. The `System.Progress` module contains a tutorial. Features: * update progress from multiple threads, * non-progress diagnostics that just scroll by (e.g. logging), * breaking the state apart for individual threads, so they can update their relevant portion of the progress bar without interfering with each other ("zooming"), * smart throttling (no updates drawn when nothing is happening, and only ever drawn at a maximum rate). Here is a very simple example: import Control.Concurrent import System.Progress main = withProgress_ "" id $ \pm -> do -- Set the progress bar: setMeter pm "Working..." -- Do some "work": threadDelay 3000000 -- Print something while temporarily hiding the progress bar: putMsgLn pm "Some extra diagnostics that scrolls by" setMeter pm "Almost done..." threadDelay 1000000 putMsgLn pm "Done." The first argument of 'withProgress_' is the initial state and the second is a renderer for the current state: render :: Int -> String render p = "Progress: " ++ show p ++ "%" withProgress_ 0 render $ \pm -> do threadDelay 1000000 setMeter pm 10 threadDelay 8900000 setMeter pm 99 -- The famous last percent: threadDelay 10000000 putMsgLn pm "Done." Progress-meter will do The Right Thing when you update the state or produce log messages from multiple threads. Happy holidays ertes