Progress monitoring is a crucial part of many applications, and deserves a simple, standardized interface.

The progress.Reader interface aims to be just that.

progress.Reader interface
    DoneChan() (done chan struct{}, completed bool)
    Count() (finished uint64, total uint64)

To drive adoption and provide practical utility, we've also included handy tools right out of the box! 📦

🤩 If you like the idea, here's the fastest way to expose a progress.Reader.

This concurrency-safe utility makes instrumenting your long-running functions with a Reader implementation absolutely painless. Support progress and make your library consumers extremely happy!

This simple wrapper adds helpful functions to a Reader, such as estimating the remaining time:

PerSecond() float64
Remaining() time.Duration
Percentage() float64
InProgress() bool

Instantly start a goroutine that keeps an eye on a Reader and logs informative updates! 👀 Here's what it looks like today:

searching:  49% (20.69/s, 1.256483582s remaining)
searching:  56% (18.01/s, 1.221804358s remaining)
searching:  80% (20.37/s, 490.981158ms remaining)
searching: 100% (21.98/s, 0s remaining)

Drop in replacement for sync.WaitGroup that satisfies the Reader interface.

Here's some simple ideas for those looking to contribute.

• Satisfy progress.Reader with just a count.
• Return a progress.Reader from a slice or channel.
• Create a pretty terminal progress bar.
• Experiment with passing return types through.