crafting-interpreters/rust/rox/src/main.rs

use std::process::exit;

use clap::Parser;
use rox::cli::{Cli, Commands};
use tracing::error;

/// Cli entrypoint.
fn main() {
    if std::env::var_os("RUST_LOG").is_none() {
        std::env::set_var("RUST_LOG", "info");
    }
    tracing_subscriber::fmt::init();

    let cli = Cli::parse();

    match &cli.command {
        Commands::Compile(compile_config) => {
            if !&compile_config.source.exists() {
                error!(
                    "{} does not exist",
                    &compile_config.source.to_string_lossy()
                );
                exit(1);
            }

            if let Err(e) = rox::compile(&compile_config.source) {
                error!(
                    "failed to compile {}: {}",
                    &compile_config.source.to_string_lossy(),
                    e
                );
            }
        }
        Commands::Repl => {
            rox::repl();
        }
    }
}