use rlua::prelude::*;use mime_guess;pub fn init(lua: &Lua) -> crate::Result<()> {    let module = lua.create_table()?;    module.set("get_mime_type", lua.create_function(|_, ext: String| {        Ok(mime_guess::get_mime_type(&ext).to_string())    })?)?;    module.set("guess_mime_type", lua.create_function(|_, path: String| {        Ok(mime_guess::guess_mime_type(&path).to_string())    })?)?;    lua.globals().set("mime", module)?;    Ok(())}#[cfg(test)]mod tests {    use super::*;    #[test]    fn lua_mime_get_type () {        let lua = Lua::new();        init(&lua).unwrap();        lua.exec::<_, ()>(r#"            local mime = mime.get_mime_type("gif")            assert(mime == "image/gif")        "#, None).unwrap();    }    #[test]    fn lua_mime_guess_type () {        let lua = Lua::new();        init(&lua).unwrap();        lua.exec::<_, ()>(r#"            local mime = mime.guess_mime_type("file.txt")            assert(mime == "text/plain")        "#, None).unwrap();    }}