nushell/crates/nu-engine/src/history_path.rs

use nu_data::config::Conf;
use std::path::PathBuf;

const DEFAULT_LOCATION: &str = "history.txt";

pub fn history_path(config: &dyn Conf) -> PathBuf {
    let default_path = nu_data::config::user_data()
        .map(|mut p| {
            p.push(DEFAULT_LOCATION);
            p
        })
        .unwrap_or_else(|_| PathBuf::from(DEFAULT_LOCATION));

    config
        .var("history-path")
        .map_or(default_path.clone(), |custom_path| {
            match custom_path.as_string() {
                Ok(path) => PathBuf::from(path),
                Err(_) => default_path,
            }
        })
}