Function progressbar 

pub fn progressbar<I>(
    iter: I,
    length: Option<usize>,
    label: Option<&str>,
) -> ProgressBarIter<I::IntoIter> 
where
    I: IntoIterator,
    I::IntoIter: ExactSizeIterator,

Wrap an iterator with a progress bar display.

Arguments

• iter - The iterator to wrap
• length - Total length (for percentage/ETA), or None to infer from iterator
• label - Optional label to display

Returns

An iterator that displays progress as items are consumed.

Example

use click::termui::progressbar;

let items = vec![1, 2, 3, 4, 5];
for item in progressbar(items.iter(), Some(items.len()), Some("Processing")) {
    // Process item
}