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pyaegis/BUILD.md

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# Building pyaegis
This document contains instructions for developers who want to build pyaegis from source.
## Prerequisites
- **Python 3.12 or later** (CPython only)
- **Zig compiler** (required for building the libaegis static library)
- **C compiler** (gcc, clang, or MSVC) with development headers
- **uv** (recommended for dependency management) or **pip**
### Installing Zig
pyaegis uses Zig to build the underlying libaegis C library. Install Zig from [ziglang.org/download](https://ziglang.org/download/) or using your package manager:
- **macOS**: `brew install zig`
- **Linux**: See [Zig installation guide](https://github.com/ziglang/zig/wiki/Install-Zig-from-a-Package-Manager)
- **Windows**: `choco install zig` or `scoop install zig`
## Getting the Source
Clone the repository with submodules:
```fish
git clone --recursive https://github.com/LeoVasanko/pyaegis.git
cd pyaegis
```
If you already cloned without `--recursive`, initialize submodules:
```fish
git submodule update --init --recursive
```
## Development Setup
### Installing in the development tree
```fish
uv sync
uv run setup.py build_ext --inplace
```
The latter command is necessary for building the C code into the source tree, as normal `uv build` does not place it there (only in wheels).
## Building libaegis Separately (Optional)
The build process automatically builds libaegis, but you can build it manually:
```fish
cd libaegis
zig build -Drelease
```
This creates the static library in `libaegis/zig-out/lib/`, and the Python CFFI build will find it from there.
## Running Tests
Run the test suite:
```fish
uv run pytest
```
## Building Distributions
Build source and wheel distributions:
```fish
uv build
```
This creates files in the `dist/` directory.
## Code Generation
The Python modules and CFFI definitions are generated from C sources and templates. If you modify the core implementation in `pyaegis/aegis256x4.py` or update libaegis headers, regenerate all files:
```fish
python tools/generate.py
```
## Troubleshooting
### Zig Not Found
If you see an error about Zig not being found, ensure it's installed and in your PATH:
```fish
zig version
```
If you cannot install Zig, you may manually compile in the libaegis folder (Zig, CMake) or simply place a libaegis.a in there if you can get it from elsewhere as a binary.
### Build Failures
- Ensure you have a C compiler installed
- On macOS, you may need Xcode command line tools: `xcode-select --install`
- On Linux, install development packages (e.g., `build-essential` on Ubuntu)
## Project Structure
- `pyaegis/` - Python package source
- `libaegis/` - C library source (submodule)
- `tests/` - Test suite
- `tools/` - Code generation scripts and `build_backend.py` used to build libaegis