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: mod.rs
    path of file: ./repos/ajour/crates/core/src/config
    
    the code of the file until where you have to start completion: use crate::catalog;
use crate::error::FilesystemError;
use crate::repository::CompressionFormat;
use glob::MatchOptions;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt::{self, Display, Formatter};
use std::fs::create_dir_all;
use std::path::{Path, PathBuf};
    
    pub fn add_wow_directories(&mut self, path: PathBuf, flavor: Option<Flavor>) {
        if let Some(flavor) = flavor {
            // If a flavor is supplied we only update path for that specific flavor.
            let flavor_path = self.get_flavor_directory_for_flavor(&flavor, &path);
            if flavor_path.exists() {
                self.wow.directories.insert(flavor, flavor_path);
            }
        } else {
            // If no flavor is supplied it will find as many flavors as possible in the path.
            let flavors = &Flavor::ALL[..];
            for flavor in flavors {
                let flavor_path = self.get_flavor_directory_for_flavor(flavor, &path);
                if flavor_path.exists() {
                    self.wow.directories.insert(*flavor, flavor_path);
                }
            }
        }
    }