prebindgen-project-root 0.4.1

Utility to expose the workspace project root at build time
Documentation 
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use std::path::PathBuf;

fn main() {
    // If the crate is located under CARGO_HOME (i.e., used as a dependency outside the workspace),
    // we cannot infer the workspace root reliably. Panic with guidance.
    let cargo_home = if let Ok(ch) = std::env::var("CARGO_HOME") {
        PathBuf::from(ch)
    } else if let Ok(home) = std::env::var("HOME") {
        PathBuf::from(home).join(".cargo")
    } else {
        panic!("Unable to determine CARGO_HOME and HOME is not set");
    };

    let manifest_dir =
        PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set"));

    if manifest_dir.starts_with(cargo_home) {
        println!("cargo:rustc-env=PROJECT_ROOT=");
        println!("cargo:warning=prebindgen-project-root is not located inside your workspace");
    } else {
        let workspace_root = project_root::get_project_root()
            .unwrap_or_else(|e| panic!("Failed to determine workspace root: {}", e));
        println!("cargo:rustc-env=PROJECT_ROOT={}", workspace_root.display());
    }
}