use std::env; use std::fs::File; use std::io::Write; use std::path::Path; pub fn main() { let feature_prefix = "CARGO_FEATURE_"; let out_dir = env::var("OUT_DIR").unwrap(); let mut crates = Vec::new(); for (key, val) in env::vars() { if val == "1" && key.starts_with(feature_prefix) { let krate = key[feature_prefix.len()..].to_lowercase(); match krate.as_ref() { "default" | "unix" | "generic" => continue, _ => {}, } crates.push(krate.to_string()); } } crates.sort(); let mut cf = File::create(Path::new(&out_dir).join("uutils_crates.rs")).unwrap(); let mut mf = File::create(Path::new(&out_dir).join("uutils_map.rs")).unwrap(); mf.write_all(" type UtilityMap = HashMap<&'static str, fn(Vec) -> i32>; fn util_map() -> UtilityMap { let mut map: UtilityMap = HashMap::new();\n".as_bytes()).unwrap(); for krate in crates { cf.write_all(format!("extern crate uu_{krate};\n", krate=krate).as_bytes()).unwrap(); match krate.as_ref() { "hashsum" => { mf.write_all("map.insert(\"hashsum\", uu_hashsum::uumain); map.insert(\"md5sum\", uu_hashsum::uumain); map.insert(\"sha1sum\", uu_hashsum::uumain); map.insert(\"sha224sum\", uu_hashsum::uumain); map.insert(\"sha256sum\", uu_hashsum::uumain); map.insert(\"sha384sum\", uu_hashsum::uumain); map.insert(\"sha512sum\", uu_hashsum::uumain);\n".as_bytes()).unwrap(); }, _ => mf.write_all(format!("map.insert(\"{krate}\", uu_{krate}::uumain);\n", krate=krate).as_bytes()).unwrap(), } } mf.write_all("map\n}\n".as_bytes()).unwrap(); cf.flush().unwrap(); mf.flush().unwrap(); }