lsv 0.1.15

Three‑pane terminal file viewer (TUI) with preview and Lua configuration
Documentation 
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use std::env;

// Environment variables are process-global and `std::env::{set_var,
// remove_var}` are `unsafe` due to potential races across threads. Rust tests
// run in parallel by default, so guard env mutations with a global mutex.
static ENV_LOCK: std::sync::Mutex<()> = std::sync::Mutex::new(());

fn with_env<T>(
    k: &str,
    v: Option<&str>,
    f: impl FnOnce() -> T,
) -> T
{
    let old = env::var(k).ok();
    unsafe {
        match v
        {
            Some(val) => env::set_var(k, val),
            None => env::remove_var(k),
        }
    }
    let out = f();
    unsafe {
        match old
        {
            Some(s) => env::set_var(k, s),
            None => env::remove_var(k),
        }
    }
    out
}

#[test]
fn discover_config_paths_honors_lsv_config_dir()
{
    let _g = ENV_LOCK.lock().unwrap();
    let tmp = tempfile::tempdir().unwrap();
    let dir = tmp.path().join("conf");
    std::fs::create_dir_all(&dir).unwrap();
    let res = with_env("LSV_CONFIG_DIR", Some(dir.to_str().unwrap()), || {
        lsv::config::discover_config_paths().unwrap()
    });
    assert_eq!(res.root, dir);
    assert_eq!(res.entry, dir.join("init.lua"));
    assert!(!res.exists);
}

#[test]
#[cfg(not(windows))]
fn discover_config_paths_uses_xdg_when_set()
{
    let _g = ENV_LOCK.lock().unwrap();
    let tmp = tempfile::tempdir().unwrap();
    let xdg = tmp.path().join("xdg");
    std::fs::create_dir_all(&xdg).unwrap();
    let res = with_env("LSV_CONFIG_DIR", None, || {
        with_env("XDG_CONFIG_HOME", Some(xdg.to_str().unwrap()), || {
            lsv::config::discover_config_paths().unwrap()
        })
    });
    assert_eq!(res.root, xdg.join("lsv"));
    assert_eq!(res.entry, xdg.join("lsv").join("init.lua"));
}