mirror of https://github.com/rwf2/Rocket.git
72 lines
2.8 KiB
Rust
72 lines
2.8 KiB
Rust
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#![feature(slice_patterns)]
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//! This tiny build script ensures that rocket_codegen is not compiled with an
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//! incompatible version of rust. It does this by executing `rustc --version`
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//! and comparing the version to `MIN_VERSION`, the minimum required version. If
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//! the installed version is less than the minimum required version, an error is
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//! printed out to the console and compilation is halted.
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extern crate ansi_term;
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use std::env;
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use std::process::Command;
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use ansi_term::Colour::{Red, Yellow, Blue, White};
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// Specifies the minimum nightly version needed to compile Rocket's codegen.
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const MIN_VERSION: &'static str = "2016-12-28";
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// Convenience macro for writing to stderr.
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macro_rules! printerr {
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($($arg:tt)*) => ({
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use std::io::prelude::*;
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write!(&mut ::std::io::stderr(), "{}\n", format_args!($($arg)*))
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.expect("Failed to write to stderr.")
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})
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}
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// Convert a string of %Y-%m-%d to a single u32 maintaining ordering.
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fn str_to_ymd(ymd: &str) -> Option<u32> {
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let ymd: Vec<_> = ymd.split("-").filter_map(|s| s.parse::<u32>().ok()).collect();
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match ymd.as_slice() {
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&[y, m, d] => Some((y << 9) | (m << 5) | d),
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_ => None,
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}
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}
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fn main() {
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// Run rustc to get the version information.
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let output = env::var("RUSTC").ok()
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.and_then(|rustc| Command::new(rustc).arg("--version").output().ok())
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.and_then(|output| String::from_utf8(output.stdout).ok())
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.and_then(|s| s.split(" ").nth(3).map(|s| s.to_string()))
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.map(|s| s.trim_right().trim_right_matches(")").to_string());
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if let Some(ref version) = output {
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let needed = str_to_ymd(MIN_VERSION);
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let actual = str_to_ymd(version);
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if let (Some(needed), Some(actual)) = (needed, actual) {
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if actual < needed {
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printerr!("{} {}",
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Red.bold().paint("Error:"),
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White.paint("Rocket codegen requires a newer version of rustc."));
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printerr!("{}{}{}",
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Blue.paint("Use `"),
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White.paint("rustup update"),
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Blue.paint("` or your preferred method to update Rust."));
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printerr!("{} {}. {} {}.",
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White.paint("Installed version is:"),
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Yellow.paint(version.as_str()),
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White.paint("Minimum required:"),
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Yellow.paint(MIN_VERSION));
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panic!("Aborting compilation due to incompatible compiler.")
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} else {
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return;
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}
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}
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}
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printerr!("{}", Yellow.paint("Warning: Rocket was unable to check rustc compatbility."));
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printerr!("{}", Yellow.paint("Build may fail due to incompatible rustc version."));
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}
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