Attribute Macro has_command

#[has_command]

Macro to test if host system has a command

use has_command::has_command;

use std::process::Command;

fn main() {
    run_ls();
    run_not_a_command();
    run_multiple();
}

#[has_command(ls)]
fn run_ls() {
    Command::new("ls").output().expect("Error running ls");
}

#[has_command(not-a-command)]
fn run_not_a_command() {
    assert!(false);
}

#[has_command(ls)]
#[has_command(ps)]
#[has_command(cat)]
fn run_multiple() {
    assert!(Command::new("ls").output().expect("Error running ls").status.success());
    assert!(Command::new("ps").output().expect("Error running ps").status.success());
    assert!(Command::new("not-a-command").output().is_err());
    assert!(!Command::new("cat").arg("not-a-file").output().expect("Error running cat").status.success());
}