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use std::path::Path;
use util::{self, CargoResult, internal, ChainError};
pub struct Rustc {
pub verbose_version: String,
pub host: String,
pub cap_lints: bool,
}
impl Rustc {
pub fn new<P: AsRef<Path>>(path: P) -> CargoResult<Rustc> {
let mut cmd = util::process(path.as_ref());
cmd.arg("-vV");
let mut ret = Rustc::blank();
let mut first = cmd.clone();
first.arg("--cap-lints").arg("allow");
let output = match first.exec_with_output() {
Ok(output) => { ret.cap_lints = true; output }
Err(..) => try!(cmd.exec_with_output()),
};
ret.verbose_version = try!(String::from_utf8(output.stdout).map_err(|_| {
internal("rustc -v didn't return utf8 output")
}));
ret.host = {
let triple = ret.verbose_version.lines().filter(|l| {
l.starts_with("host: ")
}).map(|l| &l[6..]).next();
let triple = try!(triple.chain_error(|| {
internal("rustc -v didn't have a line for `host:`")
}));
triple.to_string()
};
Ok(ret)
}
pub fn blank() -> Rustc {
Rustc {
verbose_version: String::new(),
host: String::new(),
cap_lints: false,
}
}
}