Crate capnpc

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Cap’n Proto Schema Compiler Plugin Library

This library allows you to do Cap’n Proto code generation within a Cargo build. You still need the capnp binary (implemented in C++). (If you use a package manager, try looking for a package called capnproto.)

In your Cargo.toml:

ⓘ
[dependencies]
capnp = "0.19" # Note this is a different library than capnp*c*

[build-dependencies]
capnpc = "0.19"

In your build.rs:

ⓘ
fn main() {
    capnpc::CompilerCommand::new()
        .src_prefix("schema")
        .file("schema/foo.capnp")
        .file("schema/bar.capnp")
        .run().expect("schema compiler command");
}

In your lib.rs:

ⓘ
mod foo_capnp {
    include!(concat!(env!("OUT_DIR"), "/foo_capnp.rs"));
}

mod bar_capnp {
    include!(concat!(env!("OUT_DIR"), "/bar_capnp.rs"));
}

This will be equivalent to executing the shell command

ⓘ
  capnp compile -orust:$OUT_DIR --src-prefix=schema schema/foo.capnp schema/bar.capnp

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