slow5lib-sys 0.2.0

Low-level bindings to the slow5lib C library
Documentation 
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use std::{env, error::Error, path::PathBuf};

use dunce::realpath;

fn main() -> Result<(), Box<dyn Error>> {
    println!("cargo:rerun-if-changed=build.rs");

    let streamvbyte = realpath("slow5lib/thirdparty/streamvbyte/include")?;
    let library_path = realpath("slow5lib/include")?;
    let other_includes = realpath("slow5lib/src")?;
    let slow5_include = realpath("slow5lib/include/slow5")?;

    let mut cfg = cc::Build::new();

    let mut includes = vec![library_path, streamvbyte, other_includes, slow5_include];
    if let Some(include) = std::env::var_os("DEP_Z_INCLUDE") {
        includes.push(PathBuf::from(include));
    }

    if let Some(include) = std::env::var_os("DEP_ZSTD_INCLUDE") {
        cfg.include(include);
        cfg.define("SLOW5_USE_ZSTD", "1");
    } else {
        cfg.define("SLOW5_USE_ZSTD", None);
    }

    println!(
        "cargo:include={}",
        env::join_paths(&includes)?.to_string_lossy()
    );
    println!("cargo:root={}", env::var("OUT_DIR")?);

    for path in includes {
        cfg.include(path);
    }

    cfg.file("slow5lib/thirdparty/streamvbyte/src/streamvbyte_encode.c")
        .file("slow5lib/thirdparty/streamvbyte/src/streamvbyte_decode.c")
        .file("slow5lib/thirdparty/streamvbyte/src/streamvbyte_zigzag.c")
        .file("slow5lib/src/slow5.c")
        .file("slow5lib/src/slow5_idx.c")
        .file("slow5lib/src/slow5_misc.c")
        .file("slow5lib/src/slow5_press.c");

    cfg.shared_flag(true)
        .flag("-std=c99")
        .flag("-mssse3")
        .define("STREAMVBYTE_SSSE3", "1")
        .opt_level(3)
        .compile("slow5");

    let bindings = bindgen::Builder::default()
        .header("slow5lib/include/slow5/slow5.h")
        .header("slow5lib/include/slow5/klib/khash.h")
        .header("slow5lib/include/slow5/klib/kvec.h")
        .header("slow5lib/include/slow5/slow5_defs.h")
        .header("slow5lib/include/slow5/slow5_error.h")
        .header("slow5lib/include/slow5/slow5_press.h")
        .header("slow5lib/src/slow5_misc.h")
        .header("slow5lib/src/slow5_idx.h")
        .header("slow5lib/src/slow5_extra.h")
        .clang_arg("-Islow5lib/include")
        .allowlist_function("slow5_.*")
        .allowlist_type("slow5_.*")
        .allowlist_var("SLOW5_.*")
        .size_t_is_usize(true)
        .rustfmt_bindings(true)
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .generate()
        .expect("Unable to generate bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings");

    println!("cargo:rustc-link-lib=slow5");
    println!("cargo:rustc-link-lib=zstd");
    println!("cargo:rustc-link-lib=z");
    Ok(())
}