//! Prints the `src/app.rs` a graph lowers to for the forge's Linux skeleton
//! (`codegen::linux::to_linux_app`): the demo graph's, or the graph in a JSON file.
//!
//! ```text
//! cargo run -p flowrs-core --example linux_program [-- graph.json] > app.rs
//! ```

use flowrs_core::codegen::linux::{demo_graph, to_linux_app};
use flowrs_core::graph::Graph;

fn main() {
    let graph: Graph = match std::env::args().nth(1) {
        Some(path) => serde_json::from_slice(&std::fs::read(&path).expect("read the graph"))
            .expect("a flowRS graph"),
        None => demo_graph(),
    };
    match to_linux_app(&graph, 1) {
        Ok(p) => print!("{p}"),
        Err(e) => {
            eprintln!("{e}");
            std::process::exit(1);
        }
    }
}