blazegram 0.4.2

Telegram bot framework: clean chats, zero garbage, declarative screens, pure Rust MTProto.
Documentation 
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//! Minimal ping-pong bot. Responds to /ping with MTProto round-trip latency.
//!
//! Run:  BOT_TOKEN=123:xxx cargo run --example ping_bot

use blazegram::{handler, prelude::*};
use std::time::Instant;

#[tokio::main]
async fn main() {
    tracing_subscriber::fmt::init();
    let token = std::env::var("BOT_TOKEN").expect("BOT_TOKEN required");

    App::builder(&token)
        .session_file("ping_bot.session")
        .command(
            "start",
            handler!(ctx => {
                ctx.navigate(
                    Screen::text("home", "Send /ping to measure MTProto round-trip.")
                        .build()
                ).await
            }),
        )
        .command("ping", handler!(ctx => ping_handler(ctx).await))
        .callback("ping_again", handler!(ctx => ping_handler(ctx).await))
        .run()
        .await;
}

async fn ping_handler(ctx: &mut Ctx) -> Result<(), HandlerError> {
    let t0 = Instant::now();
    let sent = ctx.send_text("Pong!").await?;
    let ms = t0.elapsed().as_millis();
    ctx.bot()
        .edit_message_text(
            ctx.chat_id,
            sent.message_id,
            format!("Pong! <code>{ms}ms</code>"),
            ParseMode::Html,
            Some(InlineKeyboard {
                rows: vec![vec![InlineButton {
                    text: "Ping again".into(),
                    action: ButtonAction::Callback("ping_again".into()),
                }]],
            }),
            false,
        )
        .await
        .ok();
    Ok(())
}