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use std::path::{ Path, PathBuf };
use std::env::temp_dir;
use lazy_static::lazy_static;
use std::io::{ Error, ErrorKind, Result };
use nix::sys::signal::Signal as NixSignal;
use std::process::Stdio;
use std::fs::File;
use log::warn;
pub mod python;
pub mod clang;
pub use python::PythonBackend;
pub use clang::ClangBackend;
lazy_static! {
static ref EVR_TMP_DIR: PathBuf = temp_dir().join("evr-tmp");
}
pub enum RunStatus {
Success,
ErrorCode(i32),
TimedOut(std::time::Duration),
Signal(NixSignal, bool),
}
pub trait Backend {
fn get_template(&self) -> Option<&str>;
fn run(&self, fname: &Path) -> Result<RunStatus>;
fn try_guess_test_file(&self, fname: &Path) -> Option<PathBuf> {
let maybe_test = fname.with_extension("txt");
if maybe_test.exists() {
return Some(maybe_test);
}
None
}
fn get_stdin(&self, fname: &Path) -> Stdio {
match self.try_guess_test_file(fname) {
Some(test_filename) => match File::open(&test_filename) {
Ok(test_content) => {
println!("Using {}", test_filename.as_path().display());
Stdio::from(test_content)
},
Err(err) => {
warn!("Could not open test file. Fallback to piped: {}", err);
Stdio::piped()
}
},
None => Stdio::piped()
}
}
}
fn mk_tmp_dir() -> Result<&'static std::path::PathBuf> {
if !EVR_TMP_DIR.exists() {
std::fs::create_dir(&*EVR_TMP_DIR)?;
} else {
if !EVR_TMP_DIR.is_dir() {
return Err(Error::new(ErrorKind::AlreadyExists,
"tmp dir already exists and not a directory"))
}
}
Ok(&*EVR_TMP_DIR)
}
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