timsrust-sdk 0.1.1

use std::{env, fs, path::PathBuf};

fn main() {
    const LIB_NAME: &str = "timsdata";
    let lib_so_name = format!("lib{}.so", LIB_NAME);

    let crate_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());

    // Allow overriding the directory that contains libtimsdata.so via an env var.
    // This is useful when building against a git dependency where the .so is not
    // committed to the repo (it is gitignored). Example:
    //   TIMSDATA_LIB_DIR=/path/to/timsrust-sdk/lib cargo build --features sdk
    let lib_path = if let Ok(override_dir) = env::var("TIMSDATA_LIB_DIR") {
        PathBuf::from(override_dir)
    } else {
        crate_dir.join("lib")
    };

    // Tell Rust where to find libtimsdata.so at build time
    println!("cargo:rustc-link-search=native={}", lib_path.display());
    println!("cargo:rustc-link-lib=dylib={}", LIB_NAME);

    // Embed a relative rpath (runtime path)
    println!("cargo:rustc-link-arg=-Wl,-rpath,$ORIGIN");

    // Determine the actual target/<profile> directory Cargo is building into.
    // OUT_DIR is e.g. <target_dir>/build/timsrust-sdk-<hash>/out, so go up 3 levels.
    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
    let target_dir = out_dir
        .ancestors()
        .nth(3)
        .expect("OUT_DIR does not have enough ancestors")
        .to_path_buf();

    // Source file you want to copy
    let source = lib_path.join(&lib_so_name);
    // Destination in the target folder
    let destination = target_dir.join(&lib_so_name);
    // Create directory if missing
    fs::create_dir_all(&target_dir).unwrap();
    // Copy the file
    fs::copy(&source, &destination).unwrap_or_else(|e| {
        panic!("Failed to copy {:?} to {:?}: {}", source, destination, e)
    });

    // Logging
    println!("cargo:warning=Target dir: {}", target_dir.display());
    println!("cargo:warning=Source dir: {}", source.display());
    // Re-run this script if the file changes
    println!("cargo:rerun-if-changed={}", source.display());
    println!("cargo:rerun-if-env-changed=TIMSDATA_LIB_DIR");
}