mstak 0.1.0

Minimal Stak Scheme interpreter
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use std::{
    env,
    error::Error,
    fs::{self, File},
    io::{self, Write},
    path::Path,
    process::{Command, Stdio},
};

const PRELUDE_SOURCE_FILE: &str = "src/prelude.scm";
const COMPILER_SOURCE_FILE: &str = "src/compile.scm";
const MINIFIER_SOURCE_FILE: &str = "src/minify.scm";

fn main() -> Result<(), Box<dyn Error>> {
    for (script_file, source_files, target_file, environment_variable) in [
        (
            MINIFIER_SOURCE_FILE,
            &[PRELUDE_SOURCE_FILE] as &[&str],
            "prelude.scm",
            "STAK_PRELUDE_FILE",
        ),
        (
            COMPILER_SOURCE_FILE,
            &[PRELUDE_SOURCE_FILE, COMPILER_SOURCE_FILE],
            "compile.bc",
            "STAK_COMPILER_FILE",
        ),
    ] {
        let target_file = Path::new(&env::var("OUT_DIR")?).join(target_file);

        println!(
            "cargo:rustc-env={environment_variable}={}",
            target_file.display()
        );

        let mut command = Command::new(option_env!("STAK_HOST_INTERPRETER").unwrap_or("stak"))
            .arg(script_file)
            .stdin(Stdio::piped())
            .stdout(Stdio::piped())
            .spawn()?;
        let stdin = command.stdin.as_mut().expect("stdin");

        for file in source_files {
            println!("cargo:rerun-if-changed={file}");
            stdin.write_all(&fs::read(file)?)?;
        }

        command.wait()?;

        io::copy(
            &mut command.stdout.expect("stdout"),
            &mut File::options()
                .create(true)
                .write(true)
                .truncate(true)
                .open(target_file)?,
        )?;
    }

    Ok(())
}