Auto merge of #233 - jrvidal:rustc-check, r=fmoko

feat(cli): check for rustc before doing anything

Addresses #190. From the backtraces shown there, it seems like we're not able to launch `rustc` (which is odd, given that they probably compiled and installed `rustlings` 🤷‍♀️)
This commit is contained in:
bors 2019-11-11 18:19:07 +00:00
commit bc56788fe6

View file

@ -7,6 +7,7 @@ use notify::{RecommendedWatcher, RecursiveMode, Watcher};
use std::ffi::OsStr;
use std::fs;
use std::path::Path;
use std::process::{Command, Stdio};
use std::sync::mpsc::channel;
use std::time::Duration;
@ -56,6 +57,13 @@ fn main() {
std::process::exit(1);
}
if !rustc_exists() {
println!("We cannot find `rustc`.");
println!("Try running `rustc --version` to diagnose your problem.");
println!("For instructions on how to install Rust, check the README.");
std::process::exit(1);
}
let toml_str = &fs::read_to_string("info.toml").unwrap();
let exercises = toml::from_str::<ExerciseList>(toml_str).unwrap().exercises;
@ -134,3 +142,13 @@ fn watch(exercises: &[Exercise]) -> notify::Result<()> {
}
}
}
fn rustc_exists() -> bool {
Command::new("rustc")
.args(&["--version"])
.stdout(Stdio::null())
.spawn()
.and_then(|mut child| child.wait())
.map(|status| status.success())
.unwrap_or(false)
}