feat: Add crate nix-c-raw

See README. Most of this is in accordance with the bindgen introduction.

The c_headers function was taken from Zach Mitchell's work on bindings.

Co-authored-by: Zach Mitchell <zmitchell@fastmail.com>
(cherry picked from commit 83d8ae6b26d341bbd452a77d7361f58c06a2d322)
This commit is contained in:
Robert Hensing 2024-02-16 09:45:29 +01:00
parent 4dca986fe2
commit 858bec68bc
7 changed files with 517 additions and 0 deletions

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[workspace]
members = [
"nix-c-raw",
]
resolver = "2"

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[package]
name = "nix-c-raw"
version = "0.1.0"
edition = "2021"
build = "build.rs"
[lib]
[build-dependencies]
bindgen = "0.69.4"
pkg-config = "0.3.30"

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# nix-c-raw
This crate contains generated bindings for the Nix C API.
**You should not have to use this crate directly,** and so you should probably not add it to your dependencies.
Instead, use the `nix-util`, `nix-store` and `nix-expr` crates, which _should_ be sufficient.
## Design
Rust bindgen currently does not allow "layered" libraries to be split into separate crates.
For example, the expr crate would have all-new types that are distinct and incompatible with the store crate.
Ideally bindgen will support reusing already generated modules, and we could move the code generation into the appropriate crates, so that the system dependencies of each crate become accurate.

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use bindgen;
use std::env;
use std::path::PathBuf;
fn main() {
// Tell cargo to invalidate the built crate whenever the wrapper changes
println!("cargo:rerun-if-changed=include/nix-c-raw.h");
// https://rust-lang.github.io/rust-bindgen/library-usage.html
let bindings = bindgen::Builder::default()
.header("include/nix-c-raw.h")
// Find the includes
.clang_args(c_headers())
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}
fn c_headers() -> Vec<String> {
let mut args = Vec::new();
// args.push("-isystem".to_string());
for path in pkg_config::probe_library("nix-expr-c")
.unwrap()
.include_paths
.iter()
{
args.push(format!("-I{}", path.to_str().unwrap()));
}
// write to stderr for debugging
eprintln!("c_headers: {:?}", args);
args
}

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#include <nix_api_util.h>
#include <nix_api_store.h>
#include <nix_api_expr.h>

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#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
include!(concat!(env!("OUT_DIR"), "/bindings.rs"));