You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/gpg-tui/src
    
    the code of the file until where you have to start completion: use anyhow::Result;
use clap::Parser;
use gpg_tui::app::handler;
use gpg_tui::app::launcher::App;
use gpg_tui::args::Args;
use gpg_tui::config::Config;
use gpg_tui::gpg::config::GpgConfig;
use gpg_tui::gpg::context::GpgContext;
use gpg_tui::term::event::{Event, EventHandler};
use gpg_tui::term::tui::Tui;
use gpg_tui::GPGME_REQUIRED_VERSION;
use ratatui::backend::CrosstermBackend;
use ratatui::Terminal;
use std::io::{self, Write};

fn main() -> Result<()> {
	// Parse command-line arguments.
	let mut args = Args::parse();
	// Parse configuration file.
	let config = if let Some(config_file) =
		args.config.to_owned().or_else(Config::get_default_location)
	{
		let config = Config::parse_config(&config_file)?;
		args = config.update_args(args);
		config
	} else {
		Config::default()
	};
	let custom_key_bindings = config
		.general
		.unwrap_or_default()
		.key_bindings
		.unwrap_or_default();
	// Initialize GPGME library.
	let gpg_config = GpgConfig::new(&args)?;
	gpg_config.check_gpgme_version(GPGME_REQUIRED_VERSION);
	let mut gpgme = GpgContext::new(gpg_config)?;
	// Create an application for rendering.
	let mut app = App::new(&mut gpgme, &args)?;
	// Initialize the text-based user interface.
	let backend = CrosstermBackend::new(io::stderr());
	let terminal = Terminal::new(backend)?;
	let events = EventHandler::new(
    
fn main() -> Result<()> {
	// Parse command-line arguments.
	let mut args = Args::parse();
	// Parse configuration file.
	let config = if let Some(config_file) =
		args.config.to_owned().or_else(Config::get_default_location)
	{
		let config = Config::parse_config(&config_file)?;
		args = config.update_args(args);
		config
	} else {
		Config::default()
	};
	let custom_key_bindings = config
		.general
		.unwrap_or_default()
		.key_bindings
		.unwrap_or_default();
	// Initialize GPGME library.
	let gpg_config = GpgConfig::new(&args)?;
	gpg_config.check_gpgme_version(GPGME_REQUIRED_VERSION);
	let mut gpgme = GpgContext::new(gpg_config)?;
	// Create an application for rendering.
	let mut app = App::new(&mut gpgme, &args)?;
	// Initialize the text-based user interface.
	let backend = CrosstermBackend::new(io::stderr());
	let terminal = Terminal::new(backend)?;
	let events = EventHandler::new(args.tick_rate);
	let mut tui = Tui::new(terminal, events);
	tui.init()?;
	// Start the main loop.
	while app.state.running {
		// Render the user interface.
		tui.draw(&mut app)?;
		// Handle events.
		match tui.events.next()? {
			Event::Key(key_event) => handler::handle_events(
				key_event,
				&custom_key_bindings,
				&mut tui,
				&mut app,
			)?,
			Event::Tick => app.tick(),
			_ => {}
		}
	}
	// Exit the user interface.
	Tui::<CrosstermBackend<io::Stderr>>::reset()?;
	// Print the exit message if any.
	if let Some(message) = app.state.exit_message {
		writeln!(io::stdout(), "{message}")?;
	}
	Ok(())
}