60 lines
1.9 KiB
Rust
60 lines
1.9 KiB
Rust
//! Build script for quicnprotochat-proto.
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//!
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//! Invokes the `capnp` compiler to generate Rust types from `.capnp` schemas
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//! located in the workspace-root `schemas/` directory.
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//!
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//! # Prerequisites
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//!
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//! The `capnp` CLI must be installed and on `PATH`.
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//!
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//! Debian/Ubuntu: apt-get install capnproto
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//! macOS: brew install capnp
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//! Docker: see docker/Dockerfile
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use std::{env, path::PathBuf};
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fn main() {
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let manifest_dir =
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PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set by Cargo"));
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// Workspace root is two levels above this crate (quicnprotochat/crates/quicnprotochat-proto).
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let workspace_root = manifest_dir
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.join("../..")
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.canonicalize()
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.expect("could not canonicalize workspace root path");
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let schemas_dir = workspace_root.join("schemas");
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// Re-run this build script whenever any schema file changes.
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println!(
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"cargo:rerun-if-changed={}",
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schemas_dir.join("envelope.capnp").display()
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);
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println!(
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"cargo:rerun-if-changed={}",
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schemas_dir.join("auth.capnp").display()
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);
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println!(
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"cargo:rerun-if-changed={}",
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schemas_dir.join("delivery.capnp").display()
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);
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println!(
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"cargo:rerun-if-changed={}",
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schemas_dir.join("node.capnp").display()
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);
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capnpc::CompilerCommand::new()
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// Treat `schemas/` as the include root so that inter-schema imports
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// resolve correctly.
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.src_prefix(&schemas_dir)
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.file(schemas_dir.join("envelope.capnp"))
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.file(schemas_dir.join("auth.capnp"))
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.file(schemas_dir.join("delivery.capnp"))
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.file(schemas_dir.join("node.capnp"))
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.run()
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.expect(
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"Cap'n Proto schema compilation failed. \
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Is `capnp` installed? (apt-get install capnproto / brew install capnp)",
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);
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}
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