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|
use std::env;
use std::env::VarError;
use std::fs::File;
use std::io::Write;
use std::path::Path;
use std::path::PathBuf;
fn cfg_serde() {
match env::var("CARGO_FEATURE_WITH_SERDE") {
Ok(_) => {
println!("cargo:rustc-cfg=serde");
}
Err(VarError::NotUnicode(..)) => panic!(),
Err(VarError::NotPresent) => {}
}
}
fn out_dir() -> PathBuf {
PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR"))
}
fn version() -> String {
env::var("CARGO_PKG_VERSION").expect("CARGO_PKG_VERSION")
}
fn write_version() {
let version = version();
let version_ident = format!(
"VERSION_{}",
version.replace(".", "_").replace("-", "_").to_uppercase()
);
let mut file = File::create(Path::join(&out_dir(), "version.rs")).expect("open");
writeln!(file, "/// protobuf crate version").unwrap();
writeln!(file, "pub const VERSION: &'static str = \"{}\";", version).unwrap();
writeln!(file, "/// This symbol is used by codegen").unwrap();
writeln!(file, "#[doc(hidden)]").unwrap();
writeln!(
file,
"pub const VERSION_IDENT: &'static str = \"{}\";",
version_ident
)
.unwrap();
writeln!(
file,
"/// This symbol can be referenced to assert that proper version of crate is used"
)
.unwrap();
writeln!(file, "pub const {}: () = ();", version_ident).unwrap();
file.flush().unwrap();
}
fn main() {
cfg_serde();
write_version();
}
|
