tsujikiri 0.5.0

辻斬り Generic C++ Bindings Generator

tsujikiri — 辻斬り

Cut through C++ bindings

tsujikiri parses C++ headers via libclang and generates binding code through a template-driven pipeline. Define what to expose, plug in a target format, and get ready-to-compile bindings.

Built-in support for LuaBridge3 (Lua bindings), LuaLS (Lua Language Server annotations), pybind11 (Python bindings), and Python type stubs (.pyi). Custom formats are first-class.

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How It Works

C++ Header (.hpp)
    │
    ▼  libclang
Intermediate Representation (IR)
    │
    ├─▶  FilterEngine        suppress classes / methods / fields by pattern
    │
    ├─▶  Transform Pipeline  rename, inject, remap types
    │
    ▼  Jinja2 templates
Target Binding Code

Each phase is independently configurable per input file and per output format.

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Documentation

Full documentation is available at tsujikiri.readthedocs.io.

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Installation

Using pip:

pip install tsujikiri

Using uv:

uv pip install tsujikiri

Requirements: Python ≥ 3.12

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Quick Start

1. Write an input config

# myproject.input.yml
source:
  path: myproject.hpp
  parse_args: ["-std=c++17"]
  include_paths: ["/usr/local/include"]

filters:
  namespaces: ["myproject"]
  classes:
    whitelist: ["Vec3", "Matrix4", "Camera"]
  constructors:
    include: true

generation:
  includes: ["<myproject.hpp>"]

2. Generate bindings

# Print to stdout
tsujikiri -i myproject.input.yml --target luabridge3 -

# Write to file
tsujikiri -i myproject.input.yml --target luabridge3 bindings.cpp

# Generate multiple outputs in one pass
tsujikiri -i myproject.input.yml \
  --target luabridge3 bindings.cpp \
  --target pybind11 py_bindings.cpp \
  --target pyi mymodule.pyi

# Dry-run: parse and filter, print summary
tsujikiri -i myproject.input.yml --target luabridge3 - --dry-run

# List available formats
tsujikiri --list-formats

3. Example output (LuaBridge3)

Given a header with a Vec3 class, tsujikiri emits:

#include <myproject.hpp>
#include <LuaBridge/LuaBridge.h>

void register_myproject(lua_State* L)
{
    luabridge::getGlobalNamespace(L)
        .beginClass<myproject::Vec3>("Vec3")
            .addConstructor<void(*)(float, float, float)>()
            .addFunction("length", &myproject::Vec3::length)
            .addFunction("dot", &myproject::Vec3::dot)
            .addProperty("x", &myproject::Vec3::x)
            .addProperty("y", &myproject::Vec3::y)
            .addProperty("z", &myproject::Vec3::z)
        .endClass();
}

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Built-in Formats

luabridge3

Generates C++ registration code for LuaBridge3.

tsujikiri -i project.input.yml --target luabridge3 bindings/lua_bindings.cpp

Handles: classes, constructors, instance/static methods, overloaded methods, properties, enums, free functions, inheritance.

luals

Generates Lua Language Server annotation stubs.

tsujikiri -i project.input.yml --target luals types/myproject.lua

Emits ---@class, ---@field, ---@param, ---@return annotations with C++→Lua type mappings.

pybind11

Generates C++ registration code for pybind11.

tsujikiri -i project.input.yml --target pybind11 src/py_bindings.cpp

Handles: classes with multiple inheritance, constructors, instance/static methods, overloaded methods (via py::overload_cast), read-write/read-only properties, enums (via py::enum_), free functions, doc strings.

pyi

Generates Python type stub files (.pyi) for use alongside pybind11 bindings.

tsujikiri -i project.input.yml --target pyi mymodule.pyi

Emits Python-typed stubs with @overload, @staticmethod, class inheritance, enum stubs as class Foo(int), and C++→Python type mappings.

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Custom Formats

Create a myformat.output.yml alongside your templates:

format_name: "myformat"
format_version: "1.0"
description: "My custom binding format"

type_mappings:
  "std::string": "String"
  "int32_t": "int"

unsupported_types:
  - "CFStringRef"

templates:
  prologue: |
    // Generated by tsujikiri
    package {{ module_name }};
  class_begin: "register_class<{{ qualified_class_name }}>(\"{{ class_name }}\""
  # ... define all template keys

Point tsujikiri at your format directory:

tsujikiri -i project.input.yml --target myformat out/bindings.cpp -F ./my_formats/

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CLI Reference

tsujikiri [OPTIONS]

Options:
  -i, --input FILE            Input config YAML (required)
  -t, --target FORMAT FILE    Output target: FORMAT is a built-in name or path to
                              .output.yml; FILE is the output path ('-' for stdout).
                              Repeatable for multiple simultaneous outputs.
  -c, --classname CLASS       Generate bindings for a single class only
  -F, --formats-dir DIR       Extra directory to search for .output.yml files (repeatable)
      --list-formats          Print available formats and exit
      --dry-run               Parse and filter only; print IR summary without generating
  -M, --manifest-file FILE    Write API manifest JSON to FILE; compare if FILE exists
      --check-compat          Exit 1 if manifest shows breaking API changes
      --embed-version         Embed the API version hash in the generated code
      --trace-transforms      Print transform stages and their targets to stderr
      --dump-ir [FILE]        Dump the post-transform IR as JSON (default: stdout)
      --validate-config       Validate input config (regex patterns, stage names) and exit
  -h, --help                  Show this message and exit

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Development

# Install task runner and sync dependencies
pip install just uv
just sync

# Run tests
just test

# Run tests with coverage
just coverage

# Build wheel
just build

The test suite covers parsing, filtering, transforms, generation, CLI integration, and end-to-end compilation with LuaBridge3.

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Coverage

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License

MIT — see LICENSE.