shrupl/doc/duck.ai_2025-06-05_04-03-23.md

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Benutzereingabe 1 von 2 - 5.6.2025, 02:27:36: in Rust, what can I use to display multiple progress bars in the terminal?

o3-mini: You can use the indicatif crate, which provides a MultiProgress type that lets you manage and display multiple progress bars concurrently in a terminal.

Below is a simple example of how to use indicatif’s MultiProgress to display multiple progress bars:

use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
use std::{thread, time::Duration};

fn main() {
    // Create a MultiProgress container.
    let m = MultiProgress::new();

    // Create several progress bars.
    let pb1 = m.add(ProgressBar::new(100));
    pb1.set_style(
        ProgressStyle::default_bar()
            .template("{msg} {bar:40.cyan/blue} {pos:>3}/{len:3}")
            .expect("Failed to set progress bar style"),
    );
    pb1.set_message("Downloading");

    let pb2 = m.add(ProgressBar::new(50));
    pb2.set_style(
        ProgressStyle::default_bar()
            .template("{msg} {bar:40.green/black} {pos:>3}/{len:3}")
            .expect("Failed to set progress bar style"),
    );
    pb2.set_message("Processing");

    // Optionally, spawn threads to update the progress bars concurrently.
    let h1 = std::thread::spawn(move || {
        for i in 0..=100 {
            pb1.set_position(i);
            thread::sleep(Duration::from_millis(50));
        }
        pb1.finish_with_message("Download complete");
    });

    let h2 = std::thread::spawn(move || {
        for i in 0..=50 {
            pb2.set_position(i);
            thread::sleep(Duration::from_millis(100));
        }
        pb2.finish_with_message("Processing complete");
    });

    // Wait for threads to complete. MultiProgress takes care of rendering.
    h1.join().expect("Thread 1 panicked");
    h2.join().expect("Thread 2 panicked");

    // You may also iterate on the multi-progress which blocks until all bars finish:
    // m.join().unwrap();
}

Steps Explained

1. MultiProgress Container:
   Create a MultiProgress instance which is used to manage multiple progress bars.

2. Progress Bars:
   Create individual progress bars using MultiProgress::add(). You can customize each progress bar with a message, style, and length.

3. Concurrent Updates:
   The example spawns two threads – one for each progress bar. Each thread updates its progress bar independently using set_position() and finishes the progress bar with finish_with_message().

4. Thread Joining:
   Ensure the main thread waits for the worker threads to complete to prevent the program from exiting prematurely.

Installation

Make sure to add indicatif to your Cargo.toml:

[dependencies]
indicatif = "0.17"  # or the latest version available on crates.io

This crate provides many options for customizing and using progress bars in a concurrent and effective manner. The documentation is available at indicatif on docs.rs for further details and advanced usage.