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use std::{cmp::Ordering, str::FromStr};
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Version {
major: u16,
minor: u16,
patch: Option<u16>,
}
impl Ord for Version {
fn cmp(&self, other: &Self) -> Ordering {
let score = |v: &Version| v.major * 100 + v.minor * 10 + v.patch.unwrap_or(0);
score(self).cmp(&score(other))
}
}
impl PartialOrd for Version {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
fn parse_number(s: &str) -> Option<u16> {
s.chars()
.take_while(|c| c.is_digit(10))
.collect::<String>()
.parse::<u16>()
.ok()
}
fn parse_version(s: &str) -> Option<Version> {
match s.split(' ').collect::<Vec<_>>().as_slice() {
[_, _, version] => {
let mut parts = version.split('.');
let major = parse_number(parts.next()?)?;
let minor = parse_number(parts.next()?)?;
let patch = parts.next().map(|p| parse_number(p)).flatten();
Some(Version {
major,
minor,
patch,
})
}
_ => None,
}
}
impl FromStr for Version {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
parse_version(s).ok_or(())
}
}
#[non_exhaustive]
pub struct SessionInfo {
nix_version: Version,
}
impl SessionInfo {
pub fn from_version(nix_version: Version) -> Self {
Self { nix_version }
}
pub fn version(&self) -> &Version {
&self.nix_version
}
}
pub fn get_nix_version() -> Option<Version> {
"nix (Nix) 2.4pre20211006_53e4794".parse::<Version>().ok()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_trivial() {
let v = "nix (Nix) 1.6.1".parse::<Version>().ok();
assert!(v.is_some())
}
#[test]
fn parse() {
let v = "nix (Nix) 2.4pre20211006_53e4794".parse::<Version>().ok();
assert!(v.is_some())
}
#[test]
fn compare_trivial() {
let v1 = "nix (Nix) 1.6.1".parse::<Version>().ok();
let v2 = "nix (Nix) 1.7.2".parse::<Version>().ok();
assert!(v2 > v1);
}
#[test]
fn compare() {
let v1 = "nix (Nix) 1.7".parse::<Version>().ok();
let v2 = "nix (Nix) 2.4pre20211006_53e4794".parse::<Version>().ok();
assert!(v2 >= v1);
}
}
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