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: app.rs
    path of file: ./repos/lsd/src
    
    the code of the file until where you have to start completion: use std::path::PathBuf;

use clap::{ArgAction, Parser, ValueHint};

#[derive(Debug, Parser)]
#[command(about, version, args_override_self = true, disable_help_flag = true)]
pub struct Cli {
    #[arg(value_name = "FILE", default_value = ".", value_hint = ValueHint::AnyPath)]
    pub inputs: Vec<PathBuf>,

    /// Do not ignore entries starting with .
    #[arg(short, long, overrides_with = "almost_all")]
    pub all: bool,

    /// Do not list implied . and ..
    #[arg(short = 'A', long)]
    pub almost_all: bool,

    /// When to use terminal colours [default: auto]
    #[arg(long, value_name = "MODE", value_parser = ["always", "auto", "never"])]
    pub color: Option<String>,

    /// When to print the icons [default: auto]
    #[arg(long, value_name = "MODE", value_parser = ["always", "auto", "never"])]
    pub icon: Option<String>,

    /// Whether to use fancy or unicode icons [default: fancy]
    #[arg(long, value_name = "THEME", value_parser = ["fancy", "unicode"])]
    pub icon_theme: Option<String>,

    /// Append indicator (one of */=>@|) at the end of the file names
    #[arg(short = 'F', long = "classify")]
    pub indicators: bool,

    /// Display extended file metadata as a table
    #[arg(short, long)]
    pub long: bool,

    /// Ignore the configuration file
    #[arg(long)]
    pub ignore_config: bool,

    /// Provide a custom lsd configuration file
    #[arg(long, value_name = "PATH")]
    pub config_file: Option<PathBuf>,

    /// Display one entry per line
    #[arg(short = '1', long)]
    pub oneline: bool,

    /// Recurse into directories
    #[arg(short = 'R', long, conflicts_with = "tree")]
    pub recursive: bool,

    /// For ls compatibility purposes ONLY, currently set by default
    #[arg(short, long)]
    human_readable: bool,

    /// Recurse into directories and present the result as a tree
    #[arg(long)]
    pub tree: bool,

    /// Stop recursing into directories after reaching specified depth
    #[arg(long, value_name = "NUM")]
    pub depth: Option<usize>,

    /// Display directories themselves, and not their contents (recursively when used with --tree)
    #[arg(short, long, conflicts_with_all = ["depth", "recursive"])]
    pub director
    
pub fn validate_time_format(formatter: &str) -> Result<String, String> {
    let mut chars = formatter.chars();
    loop {
        match chars.next() {
            Some('%') => match chars.next() {
                Some('.') => match chars.next() {
                    Some('f') => (),
                    Some(n @ ('3' | '6' | '9')) => match chars.next() {
                        Some('f') => (),
                        Some(c) => return Err(format!("invalid format specifier: %.{n}{c}")),
                        None => return Err("missing format specifier".to_owned()),
                    },
                    Some(c) => return Err(format!("invalid format specifier: %.{c}")),
                    None => return Err("missing format specifier".to_owned()),
                },
                Some(n @ (':' | '#')) => match chars.next() {
                    Some('z') => (),
                    Some(c) => return Err(format!("invalid format specifier: %{n}{c}")),
                    None => return Err("missing format specifier".to_owned()),
                },
                Some(n @ ('-' | '_' | '0')) => match chars.next() {
                    Some(
                        'C' | 'd' | 'e' | 'f' | 'G' | 'g' | 'H' | 'I' | 'j' | 'k' | 'l' | 'M' | 'm'
                        | 'S' | 's' | 'U' | 'u' | 'V' | 'W' | 'w' | 'Y' | 'y',
                    ) => (),
                    Some(c) => return Err(format!("invalid format specifier: %{n}{c}")),
                    None => return Err("missing format specifier".to_owned()),
                },
                Some(
                    'A' | 'a' | 'B' | 'b' | 'C' | 'c' | 'D' | 'd' | 'e' | 'F' | 'f' | 'G' | 'g'
                    | 'H' | 'h' | 'I' | 'j' | 'k' | 'l' | 'M' | 'm' | 'n' | 'P' | 'p' | 'R' | 'r'
                    | 'S' | 's' | 'T' | 't' | 'U' | 'u' | 'V' | 'v' | 'W' | 'w' | 'X' | 'x' | 'Y'
                    | 'y' | 'Z' | 'z' | '+' | '%',
                ) => (),
                Some(n @ ('3' | '6' | '9')) => match chars.next() {
                    Some('f') => (),
                    Some(c) => return Err(format!("invalid format specifier: %{n}{c}")),
                    None => return Err("missing format specifier".to_owned()),
                },
                Some(c) => return Err(format!("invalid format specifier: %{c}")),
                None => return Err("missing format specifier".to_owned()),
            },
            None => break,
            _ => continue,
        }
    }
    Ok(formatter.to_owned())
}