#[macro_use]
extern crate quote;

use std::env;
use std::fs::File;
use std::io::Write;
use std::path::Path;

mod codegen;
mod parser;
use self::codegen::Codegen;
#[macro_use]
extern crate failure;
use failure::ResultExt;
use std::process::Command;

fn main() -> Result<(), failure::Error> {
    let out_dir = env::var("OUT_DIR").context("reading OUT_DIR environment variable")?;
    let codegen = Codegen::gen();
    let dest_path = Path::new(&out_dir).join("bindings.rs");
    let mut f = File::create(&dest_path).unwrap();
    write!(f, "{}", codegen.get_code());

    // Given I crib this from web-sys I think it makes sense to use their env var
    // run rustfmt on the generated file - really handy for debugging
    println!("cargo:rerun-if-env-changed=WEBIDL_RUSTFMT_BINDINGS");
    if env::var("WEBIDL_RUSTFMT_BINDINGS").is_ok() {
        let status = Command::new("rustfmt")
            .arg(&dest_path)
            .status()
            .context("running rustfmt")?;
        if !status.success() {
            bail!("rustfmt failed: {}", status)
        }
    }

    Ok(())
}