Yaap

This is a straight up port of python venerable tqdm to .NET / CLR

Yaap stands for Yet Another ANSI Progressbar

Origin

From the python project README:

`tqdm` means "progress" in Arabic (taqadum, تقدّم)
and an abbreviation for "I love you so much" in Spanish (te quiero demasiado).

Instantly make your loops show a smart progress meter - just wrap any
iterable with ``tqdm(iterable)``, and you're done!

What does it do

Much like in python, Yaap can make .NET loops, IEnumerables and more show a smart progress meter.

The most dead simple way of starting with Yaap is to add it via the nuget package and

using Yaap;

foreach (var i in Enumerable.Range(0, 1000).Yaap()) {
    Thread.Sleep(10);
}

Will display a continuously updating progress bar like this, on Mac/Linux:

76%|████████████████████████████         | 7568/10000 [00:07s<00:10s, 229.00it/s]

Unfortunately, getting nice looking progress to show up on Windows is not so straight forward, unless you follow these instructions...

Out of the box, On Windows, the progress bar will be less visually appeaking and use ASCII characters:

76%|############################         | 7568/10000 [00:07s<00:10s, 229.00it/s]

What Else

Yaap has the following features:

• Easy wrapping of IEnumerable<T> with a Yaap progress bar
• Manual (non IEnumetable<T>) progress updates
• Low latency (~30ns) overhead imposed on the thread bumping the progress value
• Zero allocation (post construction) / Very little allocation during construction
• Elapsed time tracking
• Total Time Prediction
• Rate Prediction
• Metric Abbreviation for counts (K/M/G...)
• Nested / Multiple concurrent progress bars
• Butter Smooth Progress bars, by predicting the progress from the rate
• Configurable Appearance:
  • Fancy Unicode / ASCII bars
  • Colors
  • Prefix text
  • Turn selected elements on/off
• Works on Windows(!) (Some features require Windows for advanced terminal emulation)
• Dynamic Resizing (tracking the terminal width)
• Constant Width Progress Bars

Docs

Full documentation is provided here

Examples

See the Demo project for a fancy demo that covers most of what Yaap can do and how it can be optimized

You can either run the demo project with dotnet run to run all the demos sequentially or invoke specific demos with dotnet run <n> where <n> is the number of the demo to run...

FAQ and Known Issues

• What sort of terminal support is required?
  • Single progress bar at a time: only carriage-return ('\r') is needed
  • Nested /Multi progress bars: require support for moving the cursor up/down in addition to carriage-return
• What specific terminals actually work well with Yaap?
  • On Linux/Mac all terminal have full vt100 support, and should therefore work flawlessly
  • On windows, things should work well on any version of windows, except for Unicode support, which has its own page on how to make that ok-ish as well. Generally speaking, CMD.exe and ConEmu have been known to work well
• Will Yapp enumerate through the IEnumerable<T> to get the total count?
  • Absolutely not! Yaap goes through every possible known way of getting the Count "value" of the IEnumerable<T> WITHOUT actually enumerating it. This means that when an ICollection/Array/IList object is passed to Yaap, it will actually read the Count / Length property instead. Finally, Yaap uses and undocumented internal .NET interface called IIListProvider which can, sometimes calculate the count value of the enumerable without consuming it. For more information on what works/doesn't, consult the specific unit tests. Finally, when all else fails, Yaap will throw an exception, explaining that the total progress value has to be provided by the user, for Yaap to work.
• Can I write to the console while the progress bars are being updated?
  • Yes, but not directly though Console.Write*() but rather going through YaapConsole.Write*() wrapper functions, which keep everything nice and tidy
• Does dynamic resizing work?
  • Kind of: When enlarging the width everything should be OK, when reducing the width, the screen could get momentarily garbled, but everything should look ok, "eventually"...