Make it possible to pass options to printer

[JuliDi]

This could serve as a starting point for allowing users to pass options to the printers. I only tested this on macOS, and it seems to work there.

There is of course a lot that can be improved, but it might be a good start.

fixes #11

[trembel]

What's the state of this?

[doomspork]

@talesluna @JuliDi anything we could do to help with this? I'd very much like to leverage this library but I need this capability. Happy to help however.

[JuliDi]

Not sure, there isn't really anything blocking this PR. It works as is and pends integration into a new release afaik, see #11 (comment)

[sam-rusty]

Hey, great job. I currently have an electron app where i am using print api with options like this

window.webContents.print({
    margins: { marginType: 'none' },
    pageRanges: [{ from: 1, to: 1 }],
    pageSize: {
      width: 101600, // 4 inches
      height: 152400 // 6 inches
    },
})

how do i pass these options when using printers::print?

[JuliDi]

Haven't used it in a while, but this is what I have in the app I made that branch for:

let mut printer: Vec<Printer> = printers::get_printers();
let printer = printer
    .iter_mut()
    .find(|p| p.system_name == *selected)
    .unwrap();
// See https://www.cups.org/doc/options.html
printer.add_option(PrinterOption::new(r#"PageSize="Custom.54x101mm""#));
printer.add_option(PrinterOption::new(r#"orientation-requested=4"#)); // landscape
                                                                        //printer.add_option(PrinterOption::new(r#"orientation-requested=3"#)); // portrait
printer.add_option(PrinterOption::new(r#"fit-to-page"#));

printer.print_file(&file);