API to generate .rs files

API to generate .rs files to be used e. g. from build.rs.

Example code:

rust fn main() { protoc_rust_grpc::run(protoc_rust_grpc::Args { out_dir: "src", includes: &["proto"], input: &["proto/aaa.proto", "proto/bbb.proto"], rust_protobuf: true, // also generate protobuf messages, not just services ..Default::default() }).expect("protoc-rust-grpc"); }

Note this API requires protoc command present in $PATH. Although protoc-gen-rust-grpc command is not needed.