proxmox-backup/pbs-tools/src/cli.rs

use std::fs::File;
use std::io::{self, stdout, Write};
use std::path::Path;
use std::panic::{RefUnwindSafe, UnwindSafe};

/// Returns either a new file, if a path is given, or stdout, if no path is given.
pub fn outfile_or_stdout<P: AsRef<Path>>(
    path: Option<P>,
) -> io::Result<Box<dyn Write + Send + Sync + Unpin + RefUnwindSafe + UnwindSafe>> {
    if let Some(path) = path {
        let f = File::create(path)?;
        Ok(Box::new(f) as Box<_>)
    } else {
        Ok(Box::new(stdout()) as Box<_>)
    }
}