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//! This example demonstrates how to filter a Platform based on the current
//! host target.
use cargo_platform::{Cfg, Platform};
use std::process::Command;
use std::str::FromStr;
static EXAMPLES: &[&str] = &[
"cfg(windows)",
"cfg(unix)",
"cfg(target_os=\"macos\")",
"cfg(target_os=\"linux\")",
"cfg(any(target_arch=\"x86\", target_arch=\"x86_64\"))",
];
fn main() {
let target = get_target();
let cfgs = get_cfgs();
println!("host target={} cfgs:", target);
for cfg in &cfgs {
println!(" {}", cfg);
}
let mut examples: Vec<&str> = EXAMPLES.iter().copied().collect();
examples.push(target.as_str());
for example in examples {
let p = Platform::from_str(example).unwrap();
println!("{:?} matches: {:?}", example, p.matches(&target, &cfgs));
}
}
fn get_target() -> String {
let output = Command::new("rustc")
.arg("-Vv")
.output()
.expect("rustc failed to run");
let stdout = String::from_utf8(output.stdout).unwrap();
for line in stdout.lines() {
if line.starts_with("host: ") {
return String::from(&line[6..]);
}
}
panic!("Failed to find host: {}", stdout);
}
fn get_cfgs() -> Vec<Cfg> {
let output = Command::new("rustc")
.arg("--print=cfg")
.output()
.expect("rustc failed to run");
let stdout = String::from_utf8(output.stdout).unwrap();
stdout
.lines()
.map(|line| Cfg::from_str(line).unwrap())
.collect()
}