main.rs

#![warn(clippy::all, rust_2018_idioms)]
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release

// When compiling natively:
#[cfg(not(target_arch = "wasm32"))]
#[tokio::main]
async fn main() -> eframe::Result<()> {
    use tracing_subscriber::{
        fmt::{self, format::FmtSpan},
        prelude::*,
        EnvFilter,
    };

    tracing_subscriber::registry()
        .with(fmt::layer().with_span_events(FmtSpan::ACTIVE))
        .with(EnvFilter::try_from_default_env().unwrap_or_else(|_| {
            EnvFilter::new(if cfg!(debug_assertions) {
                "zbus=warn,info"
            } else {
                "warn"
            })
        }))
        .init();

    let native_options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default()
            .with_inner_size([800.0, 600.0])
            .with_min_inner_size([400.0, 400.0])
            .with_icon(
                eframe::icon_data::from_png_bytes(&include_bytes!("../assets/icon-256.png")[..])
                    .expect("Failed to load icon"),
            ),
        ..Default::default()
    };
    #[cfg(all(not(target_arch = "wasm32"), feature = "profiling"))]
    start_puffin_server();

    eframe::run_native(
        "Log Viewer",
        native_options,
        Box::new(|cc| Ok(Box::new(log_viewer::LogViewerApp::new(cc)))),
    )
}

// When compiling to web using trunk:
#[cfg(target_arch = "wasm32")]
fn main() {
    use eframe::wasm_bindgen::JsCast as _;

    // Redirect `log` message to `console.log` and friends:
    eframe::WebLogger::init(log::LevelFilter::Debug).ok();

    let web_options = eframe::WebOptions::default();

    wasm_bindgen_futures::spawn_local(async {
        let document = web_sys::window()
            .expect("No window")
            .document()
            .expect("No document");

        let canvas = document
            .get_element_by_id("the_canvas_id")
            .expect("Failed to find the_canvas_id")
            .dyn_into::<web_sys::HtmlCanvasElement>()
            .expect("the_canvas_id was not a HtmlCanvasElement");

        let start_result = eframe::WebRunner::new()
            .start(
                canvas,
                web_options,
                Box::new(|cc| Ok(Box::new(log_viewer::LogViewerApp::new(cc)))),
            )
            .await;

        // Remove the loading text and spinner:
        if let Some(loading_text) = document.get_element_by_id("loading_text") {
            match start_result {
                Ok(_) => {
                    loading_text.remove();
                }
                Err(e) => {
                    loading_text.set_inner_html(
                        "<p> The app has crashed. See the developer console for details. </p>",
                    );
                    panic!("Failed to start eframe: {e:?}");
                }
            }
        }
    });
}

#[cfg(all(not(target_arch = "wasm32"), feature = "profiling"))]
fn start_puffin_server() {
    puffin::set_scopes_on(true); // tell puffin to collect data

    match puffin_http::Server::new("127.0.0.1:8585") {
        Ok(puffin_server) => {
            tracing::info!(
                "Run:  cargo install puffin_viewer && puffin_viewer --url 127.0.0.1:8585"
            );

            std::process::Command::new("puffin_viewer")
                .arg("--url")
                .arg("127.0.0.1:8585")
                .spawn()
                .ok();

            // We can store the server if we want, but in this case we just want
            // it to keep running. Dropping it closes the server, so let's not drop it!
            #[allow(clippy::mem_forget)]
            std::mem::forget(puffin_server);
        }
        Err(err) => {
            tracing::error!("Failed to start puffin server: {err}");
        }
    };
}