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|
use std::env;
use std::ffi::OsString;
use std::fmt::{self, Display};
use std::io;
use std::process::Command;
use std::str::FromStr;
use std::string::FromUtf8Error;
use crate::date::Date;
use crate::version::{Channel::*, Version};
use proc_macro2::Span;
#[derive(Debug)]
pub enum Error {
Exec(io::Error),
Utf8(FromUtf8Error),
Parse(String),
}
pub type Result<T> = std::result::Result<T, Error>;
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match self {
Exec(e) => write!(f, "failed to run `rustc --version`: {}", e),
Utf8(e) => write!(f, "failed to parse output of `rustc --version`: {}", e),
Parse(string) => write!(
f,
"unexpected output from `rustc --version`, please file an issue: {:?}",
string,
),
}
}
}
impl From<FromUtf8Error> for Error {
fn from(err: FromUtf8Error) -> Self {
Error::Utf8(err)
}
}
impl From<Error> for syn::Error {
fn from(err: Error) -> Self {
syn::Error::new(Span::call_site(), err)
}
}
pub fn version() -> Result<Version> {
let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
let output = Command::new(rustc)
.arg("--version")
.output()
.map_err(Error::Exec)?;
let string = String::from_utf8(output.stdout)?;
match parse(&string) {
Some(version) => Ok(version),
None => Err(Error::Parse(string)),
}
}
fn parse(string: &str) -> Option<Version> {
let last_line = string.lines().last().unwrap_or(&string);
let mut words = last_line.trim().split(' ');
if words.next()? != "rustc" {
return None;
}
let mut version_channel = words.next()?.split('-');
let version = version_channel.next()?;
let channel = version_channel.next();
let mut digits = version.split('.');
let major = digits.next()?;
if major != "1" {
return None;
}
let minor = digits.next()?.parse().ok()?;
let patch = digits.next().unwrap_or("0").parse().ok()?;
let channel = match channel {
None => Stable,
Some(channel) if channel == "dev" => Dev,
Some(channel) if channel.starts_with("beta") => Beta,
Some(channel) if channel == "nightly" => {
match words.next() {
Some(hash) => {
if !hash.starts_with('(') {
return None;
}
let date = words.next()?;
if !date.ends_with(')') {
return None;
}
let date = Date::from_str(&date[..date.len() - 1]).ok()?;
Nightly(date)
}
None => Dev,
}
}
Some(_) => return None,
};
Some(Version {
minor,
patch,
channel,
})
}
#[test]
fn test_parse() {
let cases = &[
(
"rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)",
Version {
minor: 0,
patch: 0,
channel: Stable,
},
),
(
"rustc 1.18.0",
Version {
minor: 18,
patch: 0,
channel: Stable,
},
),
(
"rustc 1.24.1 (d3ae9a9e0 2018-02-27)",
Version {
minor: 24,
patch: 1,
channel: Stable,
},
),
(
"rustc 1.35.0-beta.3 (c13114dc8 2019-04-27)",
Version {
minor: 35,
patch: 0,
channel: Beta,
},
),
(
"rustc 1.36.0-nightly (938d4ffe1 2019-04-27)",
Version {
minor: 36,
patch: 0,
channel: Nightly(Date {
year: 2019,
month: 4,
day: 27,
}),
},
),
(
"rustc 1.36.0-dev",
Version {
minor: 36,
patch: 0,
channel: Dev,
},
),
(
"rustc 1.36.0-nightly",
Version {
minor: 36,
patch: 0,
channel: Dev,
},
),
(
"warning: invalid logging spec 'warning', ignoring it
rustc 1.30.0-nightly (3bc2ca7e4 2018-09-20)",
Version {
minor: 30,
patch: 0,
channel: Nightly(Date {
year: 2018,
month: 9,
day: 20,
}),
},
),
];
for (string, expected) in cases {
assert_eq!(parse(string).unwrap(), *expected);
}
}
|
