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/**
*
* @file FileSystemLoader.cpp
* @author Gaspard Kirira
*
* Copyright 2025, Gaspard Kirira.
* All rights reserved.
* https://github.com/vixcpp/vix
*
* Use of this source code is governed by a MIT license
* that can be found in the License file.
*
* Vix.cpp
*
*/
#include <vix/template/FileSystemLoader.hpp>
#include <vix/template/Error.hpp>
#include <cstdint>
#include <filesystem>
#include <fstream>
#include <sstream>
#include <utility>
namespace vix::template_
{
namespace
{
std::string join_path(const std::string &root, const std::string &name)
{
if (root.empty())
{
return name;
}
if (root.back() == '/')
{
return root + name;
}
return root + "/" + name;
}
} // namespace
FileSystemLoader::FileSystemLoader(std::string root)
: root_(std::move(root))
{
}
std::string FileSystemLoader::load(const std::string &name) const
{
const std::string path = join_path(root_, name);
std::ifstream file(path, std::ios::in | std::ios::binary);
if (!file)
{
throw LoaderError("failed to open template file: " + path);
}
std::ostringstream buffer;
buffer << file.rdbuf();
return buffer.str();
}
bool FileSystemLoader::exists(const std::string &name) const
{
const std::string path = join_path(root_, name);
std::ifstream file(path, std::ios::in | std::ios::binary);
return file.good();
}
std::string FileSystemLoader::source_signature(
const std::string &name) const
{
namespace fs = std::filesystem;
const std::string path = join_path(root_, name);
std::error_code ec;
const fs::file_time_type last_write = fs::last_write_time(path, ec);
if (ec)
{
return {};
}
const std::int64_t since_epoch =
static_cast<std::int64_t>(last_write.time_since_epoch().count());
return std::to_string(since_epoch);
}
const std::string &FileSystemLoader::root() const noexcept
{
return root_;
}
} // namespace vix::template_