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: meta.rs
    path of file: ./repos/rust-doom/wad/src
    
    the code of the file until where you have to start completion: use super::errors::{ErrorKind, Result};
use super::name::WadName;
use super::types::{SpecialType, ThingType, WadCoord};
use failchain::ResultExt;
use indexmap::IndexMap;
use log::{error, warn};
use regex::Regex;
use serde::{de::Error as SerdeDeError, Deserialize, Deserializer};
use std::fs::File;
use std::io::Read;
use std::path::Path;
use
    
    pub fn sky_for(&self, name: WadName) -> Option<&SkyMetadata> {
        self.sky
            .iter()
            .find(|sky| sky.level_pattern.is_match(name.as_ref()))
            .or_else(|| {
                if let Some(sky) = self.sky.get(0) {
                    warn!(
                        "No sky found for level {}, using {}.",
                        name, sky.texture_name
                    );
                    Some(sky)
                } else {
                    error!("No sky metadata provided.");
                    None
                }
            })
    }