💤

The progress bar with sane defaults that doesn't slow down your loops. Inspired by [tqdm].

toml [dependencies] zzz = "0.2"

Features

• Seamless integration with iterators and streams
  • If possible, zzz infers the target size from size_hint()
• Automagically determines and updates a good printing frequency
• Very low overhead: doesn't slow down your loop, pretty much no matter how simple the loop body. On Skylake, the average overhead per iteration for a
  • !Sync/add based progress bar is 3 CPU cycles
  • Sync/add_sync based progress bar is ~40 CPU cycles (depends on how many threads are updating the shared state)

Cargo Features

• streams: Enables support for .progress() on async streams (futures::streams::Stream)

Usage examples

Adding a progress bar to an iterator

```rust use zzz::ProgressBarIterExt as _;

for _ in (0..1000).into_iter().progress() { // ^^^^^^^^ } ```

If size_hint() for the iterator defines an upper bound, it is automatically taken as the target. Otherwise, a progress indicator ("spinner") is displayed.

Manually creating and advancing a progress bar ```rust use zzz::ProgressBar;

let mut pb = ProgressBar::with_target(1234); for _ in 0..1234 { pb.add(1); } ```

Manually creating a spinner (for unknown target progress indicator)

```rust use zzz::ProgressBar;

let mut pb = ProgressBar::spinner(); for _ in 0..5678 { pb.add(1); } ```