зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
2.2 KiB
Rust
88 строки
2.2 KiB
Rust
use std::env;
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use std::ffi::OsString;
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use std::io::{self, Write};
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use std::process::Command;
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fn main() {
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let version = match Version::read() {
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Ok(version) => version,
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Err(err) => {
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writeln!(
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&mut io::stderr(),
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"failed to parse `rustc --version`: {}",
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err
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).unwrap();
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return;
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}
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};
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enable_i128(version);
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}
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fn enable_i128(version: Version) {
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if version < (Version { major: 1, minor: 26, patch: 0 }) {
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return;
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}
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println!("cargo:rustc-cfg=byteorder_i128");
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)]
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struct Version {
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major: u32,
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minor: u32,
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patch: u32,
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}
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impl Version {
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fn read() -> Result<Version, String> {
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let rustc = env::var_os("RUSTC").unwrap_or(OsString::from("rustc"));
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let output = Command::new(&rustc)
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.arg("--version")
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.output()
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.unwrap()
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.stdout;
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Version::parse(&String::from_utf8(output).unwrap())
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}
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fn parse(mut s: &str) -> Result<Version, String> {
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if !s.starts_with("rustc ") {
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return Err(format!("unrecognized version string: {}", s));
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}
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s = &s["rustc ".len()..];
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let parts: Vec<&str> = s.split(".").collect();
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if parts.len() < 3 {
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return Err(format!("not enough version parts: {:?}", parts));
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}
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let mut num = String::new();
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for c in parts[0].chars() {
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if !c.is_digit(10) {
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break;
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}
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num.push(c);
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}
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let major = try!(num.parse::<u32>().map_err(|e| e.to_string()));
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num.clear();
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for c in parts[1].chars() {
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if !c.is_digit(10) {
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break;
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}
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num.push(c);
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}
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let minor = try!(num.parse::<u32>().map_err(|e| e.to_string()));
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num.clear();
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for c in parts[2].chars() {
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if !c.is_digit(10) {
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break;
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}
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num.push(c);
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}
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let patch = try!(num.parse::<u32>().map_err(|e| e.to_string()));
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Ok(Version { major: major, minor: minor, patch: patch })
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}
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}
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