//! This build script was originally taken from the Rocket web framework:
//! https://github.com/SergioBenitez/Rocket
-use ansi_term::Colour::Red;
-use rustc_version::{version_meta, version_meta_for, Channel, Version, VersionMeta};
use std::env;
fn main() {
- check_rustc_version();
-
// Forward the profile to the main compilation
println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
// Don't rebuild even if nothing changed
println!("cargo:rerun-if-changed=build.rs");
}
-
-fn check_rustc_version() {
- let string = include_str!("min_version.txt");
- let min_version_meta = version_meta_for(string).expect("Could not parse version string in min_version.txt");
- let current_version_meta = version_meta().expect("Could not retrieve current rustc version information from ENV");
-
- let min_version = min_version_meta.clone().semver;
- let min_date_str = min_version_meta
- .clone()
- .commit_date
- .expect("min_version.txt does not contain a rustc commit date");
-
- // Dev channel (rustc built from git) does not have any date or commit information in rustc -vV
- // `current_version_meta.commit_date` would crash, so we return early here.
- if current_version_meta.channel == Channel::Dev {
- return;
- }
-
- let current_version = current_version_meta.clone().semver;
- let current_date_str = current_version_meta
- .clone()
- .commit_date
- .expect("current rustc version information does not contain a rustc commit date");
-
- let print_version_err = |version: &Version, date: &str| {
- eprintln!(
- "> {} {}. {} {}.\n",
- "Installed rustc version is:",
- format!("{} ({})", version, date),
- "Minimum required rustc version:",
- format!("{} ({})", min_version, min_date_str)
- );
- };
-
- if !correct_channel(¤t_version_meta) {
- eprintln!(
- "\n{} {}",
- Red.bold().paint("error:"),
- "Clippy requires a nightly version of Rust."
- );
- print_version_err(¤t_version, &*current_date_str);
- eprintln!(
- "{}{}{}",
- "See the README (", "https://github.com/rust-lang-nursery/rust-clippy#usage", ") for more information."
- );
- panic!("Aborting compilation due to incompatible compiler.")
- }
-
- let current_date = str_to_ymd(¤t_date_str).unwrap();
- let min_date = str_to_ymd(&min_date_str).unwrap();
-
- if current_date < min_date {
- eprintln!(
- "\n{} {}",
- Red.bold().paint("error:"),
- "Clippy does not support this version of rustc nightly."
- );
- eprintln!(
- "> {}{}{}",
- "Use `", "rustup update", "` or your preferred method to update Rust."
- );
- print_version_err(¤t_version, &*current_date_str);
- panic!("Aborting compilation due to incompatible compiler.")
- }
-}
-
-fn correct_channel(version_meta: &VersionMeta) -> bool {
- match version_meta.channel {
- Channel::Stable | Channel::Beta => false,
- Channel::Nightly | Channel::Dev => true,
- }
-}
-
-/// Convert a string of %Y-%m-%d to a single u32 maintaining ordering.
-fn str_to_ymd(ymd: &str) -> Option<u32> {
- let ymd: Vec<u32> = ymd.split("-").filter_map(|s| s.parse::<u32>().ok()).collect();
- if ymd.len() != 3 {
- return None;
- }
-
- let (y, m, d) = (ymd[0], ymd[1], ymd[2]);
- Some((y << 9) | (m << 5) | d)
-}