use std::{
env,
path::PathBuf,
fs::File,
io::Write,
};
fn main() {
println!("cargo:rerun-if-env-changed=DEFMT_BBQ_BUFFER_SIZE");
let size = env::var("DEFMT_BBQ_BUFFER_SIZE")
.map(|s| {
s.parse()
.expect("could not parse DEFMT_BBQ_BUFFER_SIZE as usize")
})
.unwrap_or(1024_usize);
let out_dir_path = PathBuf::from(env::var_os("OUT_DIR").unwrap());
let out_file_path = out_dir_path.join("consts.rs");
let mut out_file = File::create(&out_file_path).unwrap();
out_file.write_all(format!("pub const BUF_SIZE: usize = {};\n", size).as_bytes()).unwrap();
out_file.flush().unwrap();
}