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use serde_derive::{ Serialize, Deserialize };
use crate::backends::{ Backend, mk_tmp_dir };
use std::path::Path;
use std::process::Command;
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use log::trace;
type Result<T> = std::io::Result<T>;
#[derive(Debug, Serialize, Deserialize, Default)]
pub struct ClangBackend {
template: Option<String>,
#[serde(default)]
args: Vec<String>,
#[serde(default = "default_cc")]
cc: String,
}
fn default_cc() -> String {
"clang++".to_string()
}
fn get_binary_by_filename(fname: &Path) -> Result<std::path::PathBuf> {
let hashed_fname = {
let mut hasher = DefaultHasher::new();
fname.hash(&mut hasher);
format!("{:x}", hasher.finish())
};
Ok(mk_tmp_dir()?.join(hashed_fname))
}
impl ClangBackend {
fn build(&self, fname: &Path) -> Result<std::path::PathBuf> {
let binary_fname = get_binary_by_filename(fname)?;
let get_mtime = |file| {
std::fs::metadata(file)?
.modified()
};
let src_mod = get_mtime(fname);
let binary_mod = get_mtime(&binary_fname);
if src_mod.is_err() || binary_mod.is_err() || src_mod.unwrap() > binary_mod.unwrap() {
let clang_status = Command::new(&self.cc)
.args(&self.args)
.arg("-x").arg("c++")
.arg(fname.as_os_str())
.arg("-o").arg(&binary_fname)
.arg("-lstdc++")
.status()?;
trace!("{:#?}", clang_status);
if !clang_status.success() {
return Err(std::io::Error::new(std::io::ErrorKind::Other,
"could not compile"));
}
}
Ok(binary_fname)
}
}
impl Backend for ClangBackend {
fn get_template(&self) -> Option<&str> {
match self.template {
Some(ref t) => Some(t),
None => None
}
}
fn run(&self, fname: &Path) -> std::io::Result<()> {
let binary_fname = self.build(fname)?;
Command::new(&binary_fname)
.status()
.map(|status| {
trace!("{:#?}", status);
()
})
}
}
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