jj/lib/build.rs
Martin von Zweigbergk c7ee24727a protobuf: generate code at build-time
I had tried to generate the protobuf code at build time many months
ago, but decided against it because it slowed down the build too
much. I didn't realize there was the
"cargo:rerun-if-changed=<filename>" feature that time. Given that that
exists, it seems like an obvious win to generate the source code at
build time.

I put the generated sources in `$OUT_DIR` (where [1] says they should
be), then include them in the `protos` module by using the `include!`
macro. The biggest problem with that is that I couldn't get IntelliJ
to understand it, even after enabling the experimental features
described in [2].

 [1] https://doc.rust-lang.org/cargo/reference/build-script-examples.html#code-generation

 [2] https://github.com/intellij-rust/intellij-rust/issues/1908#issuecomment-592773865
2020-12-24 01:05:17 -08:00

47 lines
1.4 KiB
Rust

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
extern crate protobuf_codegen_pure;
use protobuf_codegen_pure::Customize;
use std::path::Path;
fn main() {
let out_dir = format!("{}/protos", std::env::var("OUT_DIR").unwrap());
if Path::new(&out_dir).exists() {
std::fs::remove_dir_all(&out_dir).unwrap();
}
std::fs::create_dir(&out_dir).unwrap();
let input = &[
"protos/op_store.proto",
"protos/store.proto",
"protos/working_copy.proto",
];
protobuf_codegen_pure::Codegen::new()
.customize(Customize {
gen_mod_rs: Some(true),
..Default::default()
})
.out_dir(out_dir)
.inputs(input)
.include("protos")
.run()
.expect("protoc");
println!("cargo:rerun-if-changed=build.rs");
for file in input {
println!("cargo:rerun-if-changed={}", file);
}
}