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Diffstat (limited to 'rustversion/src/rustc.rs')
| -rw-r--r-- | rustversion/src/rustc.rs | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/rustversion/src/rustc.rs b/rustversion/src/rustc.rs deleted file mode 100644 index 4e7699d..0000000 --- a/rustversion/src/rustc.rs +++ /dev/null @@ -1,195 +0,0 @@ -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); - } -} |