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/dfir-toolkit/src/bin/ts2date
    
    the code of the file until where you have to start completion: use std::io::{BufRead, Write};
use regex::Regex;
use anyhow::{bail, Result};
use dfir_toolkit::common::{ForensicsTimestamp,FancyParser,TzArgument};
use cli::Cli;

mod cli;


fn main() -> Result<()> {
    let cli = Cli::parse_cli();

    let mut input = cli.input_file;
    let mut output = cli.output_file;

    if cli.src_zone.is_list() || cli.dst_zone.is_list() {
        TzArgument::display_zones();
        return Ok(());
    }

    let re = Regex::new(r"^(?P<lhs>.*?)(?P<ts>\d{10})(?P<rhs>.*)$").unwrap();
    
    for line in input.lock().lines() {
        let content = match line {
            Ok(line) => line,
            Err(_) => bail!("content of input file need to be in UTF-8 (not in UTF-16)"),
        };

        let out = match re.captures(&content) {
            Some(caps) => {
                //let ndt = NaiveDateTime::from_timestamp_opt(caps.name("ts").unwrap().as_str().parse::<i64>().unwrap(),0).unwrap();
                let ts = ForensicsTimestamp::new(caps.name("ts").unwrap().as_str().parse::<i64>().unwrap(),cli.src_zone.into_tz().unwrap(), cli.dst_zone.into_tz().unwrap());
                format!("
    
fn main() -> Result<()> {
    let cli = Cli::parse_cli();

    let mut input = cli.input_file;
    let mut output = cli.output_file;

    if cli.src_zone.is_list() || cli.dst_zone.is_list() {
        TzArgument::display_zones();
        return Ok(());
    }

    let re = Regex::new(r"^(?P<lhs>.*?)(?P<ts>\d{10})(?P<rhs>.*)$").unwrap();
    
    for line in input.lock().lines() {
        let content = match line {
            Ok(line) => line,
            Err(_) => bail!("content of input file need to be in UTF-8 (not in UTF-16)"),
        };

        let out = match re.captures(&content) {
            Some(caps) => {
                //let ndt = NaiveDateTime::from_timestamp_opt(caps.name("ts").unwrap().as_str().parse::<i64>().unwrap(),0).unwrap();
                let ts = ForensicsTimestamp::new(caps.name("ts").unwrap().as_str().parse::<i64>().unwrap(),cli.src_zone.into_tz().unwrap(), cli.dst_zone.into_tz().unwrap());
                format!("{}{}{}", caps.name("lhs").unwrap().as_str(),
                                            ts,
                                            caps.name("rhs").unwrap().as_str())

            } 
            None => content
        };

        output.lock().write_all((out+ "\n").as_bytes())?;
        
    }
    Ok(())
}