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-rw-r--r--third_party/rust/cargo-platform/examples/matches.rs55
1 files changed, 55 insertions, 0 deletions
diff --git a/third_party/rust/cargo-platform/examples/matches.rs b/third_party/rust/cargo-platform/examples/matches.rs
new file mode 100644
index 0000000000..9ad5d10dd5
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+++ b/third_party/rust/cargo-platform/examples/matches.rs
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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()
+}