kingchenc
91e05e3c26
## What
Introduces `wickra-c` — a `cdylib` + `staticlib` that exposes the Rust core over a **C ABI**. This is the hub every C-capable language (C, C++, Go, C#, Java, R) links against, instead of re-wiring each indicator natively. The native Python/Node/WASM bindings are untouched; this is purely additive, for ecosystems without first-class Rust tooling.
## Scope (foundation slice)
This PR deliberately validates the **whole pipeline end to end with one indicator (SMA)** before scaling to all 514, so the CI / cross-OS / header-drift mechanics are proven green first.
- Opaque `*mut T` handles; `wickra_<ind>_{new,update,batch,reset,free}`.
- NaN sentinel for warmup / NULL handles; caller-owned batch buffers; every function NULL-safe.
- cbindgen generates and commits `bindings/c/include/wickra.h` with opaque handle typedefs.
- A C smoke example (`examples/c/`) links the header + compiled library and runs (CMake + ctest).
- A `c-abi` CI job builds the library and runs the smoke test on **Linux, macOS and Windows**, plus a header drift check on Linux.
## Notes
- The per-indicator FFI blocks are plain `#[no_mangle]` functions, **not** a macro: cbindgen cannot see macro-generated functions on stable Rust (macro expansion needs nightly), so the blocks are written literally and will be generated mechanically by the ScriptHelpers `capi` wrapper in a follow-up (same model as the committed-but-generated Node `index.js`).
- `bindings/c` cannot inherit the workspace `forbid(unsafe_code)` lint (the C boundary needs raw pointers), so it mirrors every workspace lint and only relaxes `unsafe_code`. The Rust core stays `unsafe`-forbidden.
## Follow-ups (separate PRs)
- ScriptHelpers `capi` generator + wire the scalar family (~235).
- Hand-written blocks for multi-output / custom-input / bars (~279).
- Docs consistency wave (README / docs / webpage: Python·Node·WASM·Rust → +C).
- Release wiring (native-lib matrix + header/lib GH-release assets) — gated.
21 lines
922 B
TOML
21 lines
922 B
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language = "C"
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header = "/* Wickra C ABI — generated by cbindgen. Do not edit by hand. */"
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include_guard = "WICKRA_H"
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pragma_once = true
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# Wrap the declarations in `extern "C"` under __cplusplus so the header is usable
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# from C++ (the optional wickra.hpp RAII layer and any C++ consumer).
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cpp_compat = true
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tab_width = 4
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# Off: cbindgen copies the Rust struct/fn doc comments verbatim, and some core
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# indicator docs contain markdown (e.g. `**1/8**/**7/8**`) whose `*/` would close
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# the C block comment early and break the header. Usage docs live in the crate
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# README and examples; the header is a pure declaration contract.
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documentation = false
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[parse]
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# Parse wickra-core too so the opaque indicator handle types (Sma, Ema, …) are
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# discovered and emitted as forward-declared opaque structs. Their fields are
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# never exposed — only `T *` handles cross the boundary.
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parse_deps = true
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include = ["wickra-core"]
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