//! Build script for fe-web: rebuilds tree-sitter-fe.wasm when grammar changes.

use std::path::Path;

use std::process::Command;

fn main() {

let grammar_dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("../tree-sitter-fe");

let grammar_js = grammar_dir.join("grammar.js");

let scanner_c = grammar_dir.join("src/scanner.c");

let vendor_wasm = Path::new(env!("CARGO_MANIFEST_DIR")).join("vendor/tree-sitter-fe.wasm");

// Rerun if grammar sources change

println!("cargo:rerun-if-changed={}", grammar_js.display());

println!("cargo:rerun-if-changed={}", scanner_c.display());

// Also rerun if the vendor WASM doesn't exist

if !vendor_wasm.exists() {

println!("cargo:warning=tree-sitter-fe.wasm not found, attempting build");

}

// Try to rebuild the WASM

let output_wasm = grammar_dir.join("tree-sitter-fe.wasm");

let result = Command::new("tree-sitter")

.arg("build")

.arg("--wasm")

.current_dir(&grammar_dir)

.output();

match result {

Ok(output) if output.status.success() => {

if output_wasm.exists()

&& let Err(e) = std::fs::copy(&output_wasm, &vendor_wasm)

{

println!("cargo:warning=Failed to copy tree-sitter-fe.wasm to vendor: {e}");

}

}

Ok(output) => {

let stderr = String::from_utf8_lossy(&output.stderr);

println!(

"cargo:warning=tree-sitter build --wasm failed (using vendored copy): {stderr}"

);

}

Err(_) => {

println!("cargo:warning=tree-sitter CLI not found, using vendored tree-sitter-fe.wasm");

}

}

}