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: nu_histdb.rs
    path of file: ./repos/atuin/atuin-client/src/import
    
    the code of the file until where you have to start completion: // import old shell history!
// automatical
    
    pub fn histpath() -> Result<PathBuf> {
        let base = BaseDirs::new().ok_or_else(|| eyre!("could not determine data directory"))?;
        let config_dir = base.config_dir().join("nushell");

        let histdb_path = config_dir.join("history.sqlite3");
        if histdb_path.exists() {
            Ok(histdb_path)
        } else {
            Err(eyre!("Could not find history file."))
        }
    }