slurp.rs

use std::ffi::OsStr;
use std::process::Command;
use std::borrow::Cow;
use std::convert::Into;

pub fn exec_slurp<'a>(cmd: &'a str, args: &[&OsStr]) -> Cow<'a, str> {
  println!("exec_slurp({}, {:?})", cmd, args);

  Command::new(cmd)
    .args(args)
    .output()
    .ok()
    .and_then(|x| String::from_utf8(x.stdout).ok() )
    .map(Into::into)
    .unwrap_or(Cow::Borrowed(""))
}

pub fn exec_slurp_string(cmd: &str, args: &[&OsStr]) -> String {
  println!("exec_slurp({}, {:?})", cmd, args);

  Command::new(cmd)
    .args(args)
    .output()
    .ok()
    .and_then(|x| String::from_utf8(x.stdout).ok() )
    .unwrap_or(String::new())
}

fn main() {
}

traitobjects.rs

use std::path::Path;
use std::ffi::OsStr;

fn foo<'a>(strings: &[&'a AsRef<Path>]) -> Vec<&'a Path> {
    strings.into_iter().map(AsRef::as_ref).collect()
}

fn main() {
    foo(&[&"biz".to_string(), &Path::new("foo/bar/baz"), &OsStr::new("zab"), &"baz"]);
}