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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "lua/lua_filesystem.hpp"
#include <string>
#include <cstring>
#include "lauxlib.h"
namespace lua {
[[maybe_unused]] static constexpr char kTag[] = "lua_fs";
static constexpr char kFileEntryMetatable[] = "fs_file_entry";
static constexpr char kFileIteratorMetatable[] = "fs_iterator";
// Todo: Use std::pmr::string for paths/dirs
struct LuaFileEntry {
bool isHidden;
bool isDirectory;
bool isTrack;
std::string path;
std::string name;
};
static auto push_lua_file_entry(lua_State* L, const lua::FileEntry& r) -> void {
lua::FileEntry** entry = reinterpret_cast<lua::FileEntry**>(
lua_newuserdata(L, sizeof(uintptr_t)));
*entry = new lua::FileEntry(r);
luaL_setmetatable(L, kFileEntryMetatable);
}
auto check_file_entry(lua_State* L, int stack_pos) -> lua::FileEntry* {
lua::FileEntry* entry = *reinterpret_cast<lua::FileEntry**>(
luaL_checkudata(L, stack_pos, kFileEntryMetatable));
return entry;
}
auto check_file_iterator(lua_State* L, int stack_pos) -> lua::FileIterator* {
lua::FileIterator* it = *reinterpret_cast<lua::FileIterator**>(
luaL_checkudata(L, stack_pos, kFileIteratorMetatable));
return it;
}
static auto push_iterator(lua_State* state, const lua::FileIterator& it)
-> void {
lua::FileIterator** data = reinterpret_cast<lua::FileIterator**>(
lua_newuserdata(state, sizeof(uintptr_t)));
*data = new lua::FileIterator(it);
luaL_setmetatable(state, kFileIteratorMetatable);
}
static auto fs_iterate_prev(lua_State* state) -> int {
lua::FileIterator* it = check_file_iterator(state, 1);
it->prev();
std::optional<lua::FileEntry> res = it->value();
if (res) {
push_lua_file_entry(state, *res);
} else {
lua_pushnil(state);
}
return 1;
}
static auto fs_iterate(lua_State* state) -> int {
lua::FileIterator* it = check_file_iterator(state, 1);
it->next();
std::optional<lua::FileEntry> res = it->value();
if (res) {
push_lua_file_entry(state, *res);
} else {
lua_pushnil(state);
}
return 1;
}
static auto fs_iterator_clone(lua_State* state) -> int {
lua::FileIterator* it = check_file_iterator(state, 1);
push_iterator(state, *it);
return 1;
}
static auto fs_iterator_value(lua_State* state) -> int {
lua::FileIterator* it = check_file_iterator(state, 1);
std::optional<lua::FileEntry> res = it->value();
if (res) {
push_lua_file_entry(state, *res);
} else {
lua_pushnil(state);
}
return 1;
}
static auto fs_iterator_gc(lua_State* state) -> int {
lua::FileIterator* it = check_file_iterator(state, 1);
delete it;
return 0;
}
static const struct luaL_Reg kFileIteratorFuncs[] = {{"next", fs_iterate},
{"prev", fs_iterate_prev},
{"clone", fs_iterator_clone},
{"value", fs_iterator_value},
{"__call", fs_iterate},
{"__gc", fs_iterator_gc},
{NULL, NULL}};
static auto file_entry_path(lua_State* state) -> int {
lua::FileEntry* entry = check_file_entry(state, 1);
lua_pushlstring(state, entry->filepath.c_str(), entry->filepath.size());
return 1;
}
static auto file_entry_is_dir(lua_State* state) -> int {
lua::FileEntry* entry = check_file_entry(state, 1);
lua_pushboolean(state, entry->isDirectory);
return 1;
}
static auto file_entry_is_hidden(lua_State* state) -> int {
lua::FileEntry* entry = check_file_entry(state, 1);
lua_pushboolean(state, entry->isHidden);
return 1;
}
static auto file_entry_name(lua_State* state) -> int {
lua::FileEntry* entry = check_file_entry(state, 1);
lua_pushlstring(state, entry->name.c_str(), entry->name.size());
return 1;
}
static auto file_entry_gc(lua_State* state) -> int {
lua::FileEntry* entry = check_file_entry(state, 1);
delete entry;
return 1;
}
static const struct luaL_Reg kFileEntryFuncs[] = {{"filepath", file_entry_path},
{"name", file_entry_name},
{"is_directory", file_entry_is_dir},
{"is_hidden", file_entry_is_hidden},
{"__tostring", file_entry_name},
{"__gc", file_entry_gc},
{NULL, NULL}};
static auto fs_new_iterator(lua_State* state) -> int {
// Takes a filepath as a string and returns a new FileIterator
// on that directory
std::string filepath = luaL_checkstring(state, -1);
lua::FileIterator iter(filepath, false);
push_iterator(state, iter);
return 1;
}
static const struct luaL_Reg kFilesystemFuncs[] = {{"iterator", fs_new_iterator},
{NULL, NULL}};
static auto lua_filesystem(lua_State* state) -> int {
luaL_newmetatable(state, kFileIteratorMetatable);
lua_pushliteral(state, "__index");
lua_pushvalue(state, -2);
lua_settable(state, -3); // metatable.__index = metatable
luaL_setfuncs(state, kFileIteratorFuncs, 0);
luaL_newmetatable(state, kFileEntryMetatable);
lua_pushliteral(state, "__index");
lua_pushvalue(state, -2);
lua_settable(state, -3); // metatable.__index = metatable
luaL_setfuncs(state, kFileEntryFuncs, 0);
luaL_newlib(state, kFilesystemFuncs);
return 1;
}
auto RegisterFileSystemModule(lua_State* s) -> void {
luaL_requiref(s, "filesystem", lua_filesystem, true);
lua_pop(s, 1);
}
} // namespace lua
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