Allow logging above the progress bar

[kpcyrd]

This allows logging some information without interfering with the progress bar.

extern crate indicatif;

use std::thread;
use std::time::Duration;

use indicatif::ProgressBar;

fn main() {
    let pb = ProgressBar::new(100);
    for i in 0..100 {
        thread::sleep(Duration::from_millis(250));
        pb.println(format!("[+] finished #{}", i));
        pb.inc(1);
    }
    pb.finish_with_message("done");
}

Resolves #27

[mitsuhiko]

Does this work if a line in the log is wrapped?

[kpcyrd]

@mitsuhiko yes, works nicely. If we print 2 lines, one is a very long log line and the 2nd one is the progress bar, the terminal treats it as 3 lines (assuming one wrap), while indicatif has 2 lines recorded. Without the orphan logic it would try to clear the last two lines. This would remove the log line after the wrap and the progress bar. Since we set orphan_lines to 1, it would only clear one line, which is the progress bar.

[mitsuhiko]

Thanks. Merged. Will need to fix the appveyor stuff before I release this.

[bomgar]

This is an awesome feature. Is this going to be released at some point?

[bomgar]

I integrated this with my application. It does not seem to work with MultiProgress.

Is that something that can be added in an easy way? I might try to contribute here but I need some pointers.