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use crate::wait::ChildExitStatus;
use lazy_static::lazy_static;
use std::collections::hash_map::DefaultHasher;
use std::env::temp_dir;
use std::hash::{Hash, Hasher};
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)
}
pub fn get_binary_by_filename(fname: &Path) -> std::io::Result<PathBuf> {
let hashed_fname = {
let mut hasher = DefaultHasher::new();
fname.hash(&mut hasher);
format!("{:x}", hasher.finish())
};
Ok(mk_tmp_dir()?.join(hashed_fname))
}
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