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/bat/src/bin/bat
    
    the code of the file until where you have to start completion: #![deny(unsafe_code)]

mod app;
mod assets;
mod clap_app;
mod config;
mod directories;
mod input;

use std::collections::{HashMap, HashSet};
use std::fmt::Write as
    
fn build_assets(matches: &clap::ArgMatches, config_dir: &Path, cache_dir: &Path) -> Result<()> {
    let source_dir = matches
        .get_one::<String>("source")
        .map(Path::new)
        .unwrap_or_else(|| config_dir);

    bat::assets::build(
        source_dir,
        !matches.get_flag("blank"),
        matches.get_flag("acknowledgements"),
        cache_dir,
        clap::crate_version!(),
    )
}