lsv 0.1.15

Three‑pane terminal file viewer (TUI) with preview and Lua configuration
Documentation 
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use mlua::{
    Error as LuaError,
    Lua,
    Value,
};
use std::path::Path;

pub(crate) fn install_require(
    lua: &Lua,
    lua_root: &Path,
) -> mlua::Result<()>
{
    let root = lua_root.to_path_buf();
    let require_fn = lua.create_function(move |lua, name: String| {
        if name.contains("..") || name.starts_with('/')
        {
            return Err(LuaError::external("invalid module name"));
        }
        let rel_path = name.replace('.', "/");
        let path = root.join(format!("{}.lua", rel_path));
        // Canonicalize and ensure under root
        let canon = std::fs::canonicalize(&path)
            .map_err(|e| LuaError::external(format!("{e}")))?;
        let canon_root = std::fs::canonicalize(&root)
            .map_err(|e| LuaError::external(format!("{e}")))?;
        if !canon.starts_with(&canon_root)
        {
            return Err(LuaError::external(format!(
                "module {} outside config root {}",
                canon.to_string_lossy(),
                canon_root.to_string_lossy()
            )));
        }
        let code = std::fs::read_to_string(&canon)
            .map_err(|e| LuaError::external(format!("{e}")))?;
        let chunk = lua.load(&code).set_name(name);
        chunk.eval::<Value>()
    })?;
    let globals = lua.globals();
    globals.set("require", require_fn)?;
    Ok(())
}