red-clippy/build.rs at main · CSPF-Founder/red-clippy · GitHub

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//! Guarantees `frontend/dist` exists before `rust-embed` reads it.
//!
//! The bundle is gitignored, so a fresh clone has no `frontend/dist` and the
//! `RustEmbed` derive would fail to compile with a bare "folder does not
//! exist". That turns "you forgot `make frontend`" into a cryptic macro error.
//! Instead we materialise a placeholder `index.html` that says so in the
//! browser, and warn at build time.

use std::path::Path;

const PLACEHOLDER: &str = r#"<!doctype html>
<meta charset="utf-8">
<title>Red Clippy - frontend not built</title>
<style>
  body { font: 15px/1.6 system-ui, sans-serif; max-width: 34rem; margin: 4rem auto; padding: 0 1rem; }
  code { background: #f1f5f9; padding: .15rem .35rem; border-radius: .25rem; }
</style>
<h1>Frontend not built</h1>
<p>This binary was compiled without a React bundle, so there is no UI to serve.</p>
<p>Build the SPA and recompile:</p>
<pre><code>make frontend
cargo build --release</code></pre>
<p>The REST API under <code>/api/v1</code> and the MCP server are unaffected.</p>
"#;

fn main() {
    let dist = Path::new("frontend/dist");
    println!("cargo:rerun-if-changed=frontend/dist");

    let index = dist.join("index.html");
    if index.exists() {
        return;
    }

    if let Err(e) = std::fs::create_dir_all(dist.join("assets")) {
        println!("cargo:warning=could not create {}: {e}", dist.display());
        return;
    }
    if let Err(e) = std::fs::write(&index, PLACEHOLDER) {
        println!("cargo:warning=could not write {}: {e}", index.display());
        return;
    }
    println!(
        "cargo:warning=frontend/dist/index.html was missing; embedding a placeholder page. \
         Run `make frontend` and rebuild to embed the real UI."
    );
}