// Copyright 2024, 2025 New Vector Ltd.
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
// Please see LICENSE files in the repository root for full details.

use vergen_gitcl::{Emitter, GitclBuilder, RustcBuilder};

fn main() -> anyhow::Result<()> {
    // Instruct rustc that we'll be using #[cfg(tokio_unstable)]
    println!("cargo::rustc-check-cfg=cfg(tokio_unstable)");

    // At build time, we override the version through the environment variable
    // VERGEN_GIT_DESCRIBE. In some contexts, it means this variable is set but
    // empty, so we unset it here.
    if let Ok(ver) = std::env::var("VERGEN_GIT_DESCRIBE")
        && ver.is_empty()
    {
        #[allow(unsafe_code)]
        // SAFETY: This is safe because the build script is running a single thread
        unsafe {
            std::env::remove_var("VERGEN_GIT_DESCRIBE");
        }
    }

    let gitcl = GitclBuilder::default()
        .describe(true, false, Some("v*.*.*"))
        .build()?;
    let rustc = RustcBuilder::default().semver(true).build()?;

    Emitter::default()
        .add_instructions(&gitcl)?
        .add_instructions(&rustc)?
        .emit()?;

    Ok(())
}