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c7ee24727a
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
48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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extern crate protobuf_codegen_pure;
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use protobuf_codegen_pure::Customize;
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use std::path::Path;
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fn main() {
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let out_dir = format!("{}/protos", std::env::var("OUT_DIR").unwrap());
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if Path::new(&out_dir).exists() {
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std::fs::remove_dir_all(&out_dir).unwrap();
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}
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std::fs::create_dir(&out_dir).unwrap();
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let input = &[
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"protos/op_store.proto",
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"protos/store.proto",
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"protos/working_copy.proto",
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];
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protobuf_codegen_pure::Codegen::new()
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.customize(Customize {
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gen_mod_rs: Some(true),
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..Default::default()
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})
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.out_dir(out_dir)
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.inputs(input)
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.include("protos")
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.run()
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.expect("protoc");
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println!("cargo:rerun-if-changed=build.rs");
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for file in input {
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println!("cargo:rerun-if-changed={}", file);
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}
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}
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