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use std::fmt::{self, Display};
use std::sync::OnceLock;
use rustc_macros::{
Decodable, Encodable, HashStable_Generic, PrintAttribute, current_rustc_version,
};
use crate::PrintAttribute;
#[derive(Encodable, Decodable, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[derive(HashStable_Generic, PrintAttribute)]
pub struct RustcVersion {
pub major: u16,
pub minor: u16,
pub patch: u16,
}
impl RustcVersion {
pub const CURRENT: Self = current_rustc_version!();
pub fn current_overridable() -> Self {
*CURRENT_OVERRIDABLE.get_or_init(|| {
if let Ok(override_var) = std::env::var("RUSTC_OVERRIDE_VERSION_STRING")
&& let Some(override_) = Self::parse_str(&override_var)
{
override_
} else {
Self::CURRENT
}
})
}
fn parse_str(value: &str) -> Option<Self> {
// Ignore any suffixes such as "-dev" or "-nightly".
let mut components = value.split('-').next().unwrap().splitn(3, '.');
let major = components.next()?.parse().ok()?;
let minor = components.next()?.parse().ok()?;
let patch = components.next().unwrap_or("0").parse().ok()?;
Some(RustcVersion { major, minor, patch })
}
}
static CURRENT_OVERRIDABLE: OnceLock<RustcVersion> = OnceLock::new();
impl Display for RustcVersion {
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(formatter, "{}.{}.{}", self.major, self.minor, self.patch)
}
}
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