Lines of src/main.rs from check-in 14ef340959 that are changed by the sequence of edits moving toward check-in 8ea7b79fca:

                         1: //! Simple SMTP-to-Telegram gateway. Can parse email and send them as telegram
                         2: //! messages to specified chats, generally you specify which email address is
                         3: //! available in configuration, everything else is sent to default address.
                         4: 
                         5: mod mail;
                         6: mod telegram;
                         7: mod utils;
                         8: 
                         9: #[cfg(test)]
                        10: mod tests;
                        11: 
                        12: use crate::mail::MailServer;
                        13: 
14ef340959 2026-01-01   14: use smol::{
14ef340959 2026-01-01   15: 	fs::metadata,
14ef340959 2026-01-01   16: };
                        17: use just_getopt::{
                        18: 	OptFlags,
                        19: 	OptSpecs,
                        20: 	OptValue,
                        21: };
                        22: use stacked_errors::{
                        23: 	Result,
                        24: 	StackableErr,
                        25: 	bail,
                        26: };
                        27: 
                        28: use std::{
                        29: 	io::Cursor,
                        30: 	os::unix::fs::PermissionsExt,
                        31: 	path::Path,
                        32: };
                        33: 
14ef340959 2026-01-01   34: #[tokio::main(flavor = "current_thread")]
14ef340959 2026-01-01   35: async fn main () -> Result<()> {
                        36: 	let specs = OptSpecs::new()
                        37: 		.option("help", "h", OptValue::None)
                        38: 		.option("help", "help", OptValue::None)
                        39: 		.option("config", "c", OptValue::Required)
                        40: 		.option("config", "config", OptValue::Required)
                        41: 		.flag(OptFlags::OptionsEverywhere);
                        42: 	let mut args = std::env::args();
                        43: 	args.next();
                        44: 	let parsed = specs.getopt(args);
                        45: 	for u in &parsed.unknown {
                        46: 		println!("Unknown option: {u}");
                        47: 	}
                        48: 	if !(parsed.unknown.is_empty()) || parsed.options_first("help").is_some() {
                        49: 		println!("SMTP2TG v{}, (C) 2024 - 2025\n\n\
                        50: 			\t-h|--help\tDisplay this help\n\
                        51: 			\t-c|--config …\tSet configuration file location.",
                        52: 			env!("CARGO_PKG_VERSION"));
                        53: 		return Ok(());
                        54: 	};
                        55: 	let config_file = Path::new(if let Some(path) = parsed.options_value_last("config") {
                        56: 		&path[..]
                        57: 	} else {
                        58: 		"smtp2tg.toml"
                        59: 	});
                        60: 	if !config_file.exists() {
                        61: 		bail!("can't read configuration from {config_file:?}");
                        62: 	};
                        63: 	{
                        64: 		let meta = metadata(config_file).await.stack()?;
                        65: 		if (!0o100600 & meta.permissions().mode()) > 0 {
                        66: 			bail!("other users can read or write config file {config_file:?}\n\
                        67: 				File permissions: {:o}", meta.permissions().mode());
                        68: 		}
                        69: 	}
                        70: 	let settings: config::Config = config::Config::builder()
                        71: 		.set_default("api_gateway", "https://api.telegram.org").stack()?
                        72: 		.set_default("fields", vec!["date", "from", "subject"]).stack()?
                        73: 		.set_default("hostname", "smtp.2.tg").stack()?
                        74: 		.set_default("listen_on", "0.0.0.0:1025").stack()?
                        75: 		.set_default("unknown", "relay").stack()?
                        76: 		.set_default("domains", vec!["localhost", hostname::get().stack()?.to_str().expect("Failed to get current hostname")]).stack()?
                        77: 		.add_source(config::File::from(config_file))
                        78: 		.build()
                        79: 		.with_context(|| format!("[{config_file:?}] there was an error reading config\n\
                        80: 			\tplease consult \"smtp2tg.toml.example\" for details"))?;
                        81: 
                        82: 	let listen_on = settings.get_string("listen_on").stack()?;
                        83: 	let server_name = settings.get_string("hostname").stack()?;
                        84: 	let core = MailServer::new(settings)?;
                        85: 	let mut server = mailin_embedded::Server::new(core);
                        86: 
                        87: 	server.with_name(server_name)
                        88: 		.with_ssl(mailin_embedded::SslConfig::None).unwrap()
                        89: 		.with_addr(listen_on).unwrap();
                        90: 	server.serve().unwrap();
                        91: 
                        92: 	Ok(())
                        93: }