src/backends/mod.rs


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use crate::wait::ChildExitStatus;
use lazy_static::lazy_static;
use std::env::temp_dir;
use std::io::{Error, ErrorKind};
use std::path::{Path, PathBuf};

pub mod clang;
pub mod clang_c;
pub mod python;

pub use clang::ClangBackend;
pub use clang_c::ClangCBackend;
pub use python::PythonBackend;

pub mod run_error;
pub use run_error::RunError;

lazy_static! {
    static ref EVR_TMP_DIR: PathBuf = temp_dir().join("evr-tmp");
}

pub trait Backend {
    fn get_template(&self) -> Option<&str>;

    fn run(&self, fname: &Path) -> Result<ChildExitStatus, RunError>;
}

fn mk_tmp_dir() -> std::io::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)
}