Add support for stderr

[DrSensor]

fix #8

Usage:

use prettyprint::*;

let pring = PrettyPrinter::default()
    .paging_mode(PagingMode::Error)
    .build()?;

[mre]

That's nice @DrSensor. Thanks!

I wonder if we should add a shorthand for that so that

let printer = PrettyPrinter::default()
    .stderr()
    .build()?;

does exactly the same as

let printer = PrettyPrinter::default()
    .paging_mode(PagingMode::Error)
    .build()?;

What do you think? If it's too tricky right now, we could also create an issue for it to add it later.

[DrSensor]

I first thought that too but then, what happens when someone configures it like this:

let printer = PrettyPrinter::default()
    .stderr()
    .paging_mode(PagingMode::Always)
    .build()?;

In my opinion, 👆 means that the pager will be outputted on stderr instead of stdout. However, the command less doesn't have a flag for that and I don't know how to pipe the pager output into stderr.

Let's make that as a separate issue 😃

[mre]

Fully agree. Merging. Thanks for the PR! ⭐️

[mre]

Published 0.6.0.