fn expand(self) -> TokenStream {

let manifest_dir: PathBuf = env::var("CARGO_MANIFEST_DIR").expect("Could not locate active Cargo.toml!").into();

let lua_dir = manifest_dir.join("src").join(self.0.value());

let modules = WalkDir::new(&lua_dir).into_iter().filter_map(|entry| {

match entry {

Ok(ref entry) if entry.file_type().is_file() => {

let path = entry.path().strip_prefix(&lua_dir).expect("Reached file outside of lua directory???");

if path.extension() == Some("lua".as_ref()) {

let module = if path.parent().is_some() && path.file_stem().expect("Missing file name!") == &"init".as_ref() {

path.parent().unwrap().to_str().map(|s| s.replace(path::MAIN_SEPARATOR, "."))

}

else {

// Do paths with a different separator show up? If so, fix this.

let mut s = path.to_str().map(|s| s.replace(path::MAIN_SEPARATOR, "."));

s.as_mut().map(|s| s.truncate(s.len() - 4));

s

};

return module.map(|module| (module, path.to_owned()))

}

None

}

Err(e) => panic!("An error occured while searching for lua modules: {}", e),

_ => None,

}

});

let add_files = modules.map(|(module, path)| {

let module = LitStr::new(&module, Span::call_site());

let real_path = LitStr::new(&PathBuf::from(self.0.value()).join(&path).to_string_lossy(), Span::call_site());

let virtual_path = LitStr::new(&path.to_string_lossy(), Span::call_site());

quote! {

files.insert(#module.to_string(), (include_str!(#real_path).to_string(), #virtual_path.to_string()))

}

});

let name = &self.1;

quote! { {

#[allow(unknown_lints)]

#[cfg_attr(feature = "cargo-clippy", allow(useless_attribute))]

#[allow(rust_2018_idioms)]

extern crate include_lua as _include_lua;

let mut files = ::std::collections::HashMap::<String, (String, String)>::new();

#(#add_files;)*

_include_lua::LuaModules::__new(files, #name)

} }

}

fn parse(input: ParseStream) -> Result<Self> {

let (path_str, name) = {

let s1: LitStr = input.parse()?;

match input.parse::<Token![:]>() {

Ok(_) => (input.parse()?, s1),

Err(_) => (s1.clone(), s1),

}

};

if !input.is_empty() { return Err(input.error("Unknown token in include_lua invocation!")) }

Ok(IncludeLua(path_str, name))

}