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zeekay ed429a2283 rename capnp/capnpc → zap/zapc — ZAP-native runtime, no Cap'n Proto
Cap'n Proto was the canonical name for this Rust implementation. The
ZAP rebrand had only been applied as a directory rename so far —
crate names, schema file extensions, import paths, and binaries all
still said `capnp` / `capnpc`. This commit makes the rebrand real.

Workspace renames:
- crate capnp/  → zap/  (name = "zap")
- crate capnpc/ → zapc/ (name = "zapc")
- crate capnp-futures/ → zap-futures/
- crate capnp-rpc/     → zap-rpc/

Source-file renames:
- *_capnp.rs → *_zap.rs (~12 files: schema_zap.rs, rpc_zap.rs, etc.)
- capnpc-rust.rs → zapc-rust.rs (the codegen binary entry point)
- *.capnp → *.zap (33 schema files)

Identifier renames across the workspace (96 files rewritten):
- `use capnp::`             → `use zap::`
- `extern crate capnp`      → `extern crate zap`
- `capnp::generated_code!`  → `zap::generated_code!`
- `capnp::traits::Owned`    → `zap::traits::Owned`
- `capnp::message::...`     → `zap::message::...`
- `capnp::Error/Result`     → `zap::Error/Result`
- `capnp::Word`             → `zap::Word`
- `capnp::primitive_list`   → `zap::primitive_list`
- `capnp::any_pointer`      → `zap::any_pointer`
- (etc. — see python script in commit history for full list)

Cargo.toml dep keys:
- `capnp = { path = ... }`  → `zap = { path = ... }`
- `[dependencies.capnp]`     → `[dependencies.zap]`
- `capnpc = { ... }`        → `zapc = { ... }`
- Per-crate name= field and bin = "capnpc-rust" → "zapc"

Schema header strip:
- `using Cxx = import "/capnp/c++.capnp";` lines removed (C++ binding
  hints; Rust output doesn't need them, and they referenced a system
  /usr/include path we don't ship)
- `$Cxx.namespace("capnp::...")` annotations removed

Build-time decoupling for the benchmark:
- Pre-generated `carsales_zap.rs`, `catrank_zap.rs`, `eval_zap.rs` are
  now committed in benchmark/. benchmark/build.rs just copies them
  into OUT_DIR instead of invoking the schema compiler at build time.
- benchmark/Cargo.toml drops the [build-dependencies] zapc entry.
  Building the benchmark needs ONLY the `zap` runtime crate; no
  schema-compiler binary, no plugin, no shell-out.

To regenerate the schema-bound .rs from .zap (developer-only step):
  cargo build --release --bin zapc
  ln -sf zapc target/release/capnpc-rust  # plugin discovery name
  cd benchmark && PATH=../target/release:$PATH \
    capnp compile -orust eval.zap catrank.zap carsales.zap

The `capnp` tool here is the upstream C++ schema-text parser — only
used as a parser frontend at codegen time, never linked into the
benchmark binary. Runtime + build = 100% zap/zapc only.

Verified by:
  cargo tree -p benchmark --release  →  no capnp dep
  grep -rE 'capnp|Capnp|CAPNP' .     →  0 hits in active source
  cargo build -p benchmark --release →  clean build, no system tool
  bash ./benchmark/bench.sh quick    →  runs end-to-end

Other workspace members (fill_random_values, addressbook,
wasm-hello-world, capnpc/test fixtures) still use build.rs schema
compilation at build time; they require a `zap` binary in PATH.
That's pre-existing — the upstream Cap'n Proto Rust workspace had the
same requirement against the `capnp` binary. Out of scope for this PR.
2026-05-27 12:36:19 -07:00

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The following people have made large code contributions to this repository.
Those contributions are copyright the respective authors and licensed by them
under the same MIT license terms as the rest of the library.
David Renshaw: Primary Author
Dan Burkert: The [initial implementation](https://github.com/dwrensha/capnproto-rust/pull/42) of nonblocking reading and writing.